JPH0945106A - Lamp structure and manufacturing method thereof - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a lamp structure and a manufacturing method thereof, in which a mounting process of a molded packing can be greatly simplified, a manufacturing efficiency can be significantly improved, and a defective product rate due to the manufacturing process is low. Offer. A lamp structure having a light source, a housing, a lens, and a packing, wherein the packing has a softening temperature of 100 ° C. or higher and a melting temperature of 200.
A thermoplastic resin composition (component A) having a temperature of 50 ° C. or lower, a rubber composition (component B) at least partially vulcanized, and a melting temperature of 50 ° C. or higher and lower than 100 ° C.
% Or more of the crystalline thermoplastic polymer composition (component C)
And a method for producing the same, which comprises a thermoplastic elastomer composition containing at least a part of components B and C dispersed in component A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp structure such as an automobile headlight and a manufacturing method thereof. More specifically, by using a thermoplastic elastomer composition having a predetermined composition as a packing that becomes a joining member with a mounting position of an automobile body or the like, a lamp structure and a method of manufacturing the same can be greatly simplified. Regarding

[0002]

2. Description of the Related Art Various types of lamp structures are used for automobile headlights and the like. The lamp structure basically has a light source of a lamp and an inner surface shape which is usually a rib-like shape, holds the light source at the bottom of the depression, and reflects the light of the light source forward on the inner wall surface thereof. It is a structure in which a housing (reflector) that operates and a lamp lens that collects light from the light source and the housing and closes the open surface of the housing are integrally configured.

Further, the outer wall surface of the housing surely abuts and comes into close contact with a predetermined position of a member to which a lamp structure such as an automobile body is attached so as to tightly hold the both, and to fix screws and the like. A packing, which serves as a joining member, is installed to absorb the force when the lamp structure is fixed to the body by the bolts and nuts, and prevent the housing and the body from being distorted or damaged.

In such a lamp structure, the packing to be mounted on the outer wall surface of the housing is preferably such that the lamp structure (housing) and a member to be mounted such as an automobile body can be securely brought into close contact with each other. Rubber heat resistance and good heat resistance with little change in characteristics due to heat when the lamp is lit (usually the housing is about 80 to 100 ° C.) are required. Therefore, as the packing, a vulcanized rubber sheet such as ethylene / propylene / diene copolymer rubber (EPDM) or acrylonitrile butadiene rubber (NBR) chloroprene rubber (CR) composition is used for the lamp structure or the lamp structure of the automobile body. A molded product (hereinafter referred to as molded packing) punched and molded according to the shape of the mounting position is preferably used. However, there is a problem in that the mounting process of the molded packing lowers the productivity of the assembly process of the lamp structure.

That is, the mounting of the molded packing is
First, a vulcanized rubber sheet is punched and molded to form a molded packing, and then an adhesive such as a hot melt adhesive or a cyanoacrylate adhesive is applied to a predetermined position of the housing and / or the molded packing, and then the housing A process such as attaching a molded packing to a predetermined position is required. This step is a step that requires man-hours in assembling the lamp structure, which is one of the causes of the decrease in the productivity of the lamp structure. Moreover, there is a problem that the vulcanized rubber packing once attached cannot be recycled such as melted and reused even if it is removed when the lamp structure is discarded.

In order to solve the above problems and to simplify the assembly process of the lamp structure, particularly the mounting process including the bonding process of the molded packing, a heat-resistant resin such as ethylene / vinyl acetate copolymer is used. It has been considered that a hot melt adhesive using a plastic resin is thickly applied to a predetermined position (a position corresponding to the molding packing) of the housing and used instead of the molding packing. However, in this method, the hot-melt material is softened in a low temperature region of, for example, about 60 ° C. due to the heat when the lamp is lit, which is significantly inferior in the heat softening resistance which is a characteristic of the conventional vulcanized rubber. , Was never put to practical use.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. It has good rubber elasticity even in a high temperature range of 100 ° C. or higher and melt molding at 200 ° C. or lower. As a lamp structure and a member to be attached, by molding a molding packing of a lamp structure of an automobile or the like using a thermoplastic elastomer composition having a predetermined composition that exhibits good melt fluidity even in a relatively low temperature range. Are properly joined to absorb the force when fixing the lamp structure to the mounting target member with bolts and nuts, etc., and the force generated due to temperature changes during use of the lamp structure and vibrations etc. when the vehicle is running. Provided is a lamp structure having a packing that exhibits necessary and sufficient performance as a packing of the lamp structure that prevents distortion and damage of the housing and the body. Also, the packing can be attached by molding the packing at the joint between the lamp structure and the attachment target member by fusion molding using a simple mold, greatly simplifying the assembly process of the lamp structure, A lamp structure that can significantly improve manufacturing efficiency, and that the packing can be easily removed from the lamp structure when the lamp structure is discarded, and after the packing is melt-molded again, that is, can be recycled. A body and a method for manufacturing the body.

[0008]

In order to achieve the above object, a lamp structure of the present invention comprises a light source, a housing for holding the light source in a predetermined position, and a housing for reflecting light from the light source on an inner wall surface. A lamp having a light source and a lens that collects light from the housing and closes the housing, and a packing that is bonded to an outer wall surface of the housing and serves as a joint member with a member to be mounted such as an automobile body. A structure, wherein the packing is formed by a thermoplastic elastomer composition containing the following components A, B and C, and at least a part of the components B and C dispersed in the component A: A lamp structure is provided. Component A: Thermoplastic resin composition having a softening temperature of 100 ° C. or higher and a melting temperature of 200 ° C. or lower Component B: A rubber composition at least partially vulcanized Component C: Melting temperature of 50 ° C. or higher and lower than 100 ° C. And
And a crystalline thermoplastic polymer composition having a crystallinity of 20% or more

The component A is a polyolefin resin, particularly a polypropylene resin and / or a polyamide resin, and the component B is an ethylene / propylene copolymer rubber (EPM) and / or an ethylene / propylene / diene copolymer rubber (EPDM). ) And the crystalline thermoplastic polymer in component C is transpolyoctenemer and / or
Or trans-1,4-polyisoprene is
In addition to solving the blocking problem in the thermoplastic elastomer manufacturing process, it also improves the heat resistance and vibration absorption properties of the product, and the process economy when manufacturing the thermoplastic elastomer as a packing between the lamp housing and body. It is preferable in terms of sex.

In the method of manufacturing a lamp structure according to the present invention, the light source, the housing for holding the light source at a predetermined position, the inner wall surface reflecting the light from the light source, and the light source and the light from the housing are condensed. A method of manufacturing a lamp structure having a lens that closes the housing and a packing that is bonded to an outer wall surface of the housing and serves as a joint member with an object to be mounted, the mounting being performed by mounting the housing and / or the lamp structure. A molding die is attached to the joint portion of the target members, and the following components A and B are placed in the molding die.
A thermoplastic elastomer composition containing C and C and at least a part of components B and C dispersed in component A is melt-injected, the molding die is removed after the thermoplastic elastomer composition is cured, and Provided is a method for manufacturing a lamp structure, which comprises manufacturing a lamp structure by joining a housing and a member to be attached with a cured product as a packing. Component A: Thermoplastic resin composition having a softening temperature of 100 ° C. or higher and a melting temperature of 200 ° C. or lower Component B: A rubber composition at least partially vulcanized Component C: Melting temperature of 50 ° C. or higher and lower than 100 ° C. And
And a crystalline thermoplastic polymer composition having a crystallinity of 20% or more

Further, in the present invention, in addition to the essential components of the thermoplastic elastomer composition, a resin composition for imparting tackiness to the thermoplastic elastomer composition finally obtained when the component A is melted, and And / or a rubber composition may be contained as the component D, and the component D may be a styrene / butadiene (.styrene) copolymer elastomer or a hydrogenated product thereof, a styrene / isoprene (.styrene) copolymer elastomer or a hydrogenated product thereof. , A resinous composition having a softening point of 60 to 150 ° C. or its hydrogenated product, a petroleum-based resin or its hydrogenated product, a terpene-based resin or its hydrogenated product, a rosin-based resin or its hydrogenated product, coumarone indene It is preferably one or more selected from the group consisting of a system resin or a hydrogenated product thereof.

The lamp structure of the present invention will be described in detail below. FIG. 1 shows a schematic cross-sectional view of an example of the lamp structure of the present invention. The lamp structure 10 of the present invention shown in FIG. 1 is basically a lamp light source 12, a housing (reflector) 14, a lens 16, and a molded packing 18 to which the lamp structure 10 is attached. It is configured by being integrally assembled with a member, for example, a body 24 of an automobile.

In the illustrated example, the housing 14 has a hollow hemispherical shape (that is, a substantially sliver-shaped inner surface shape) of which the plane portion is open, and the light source 12 is held by a known means at the bottom portion thereof. The inner surface of the housing 14 is a reflecting mirror, and reflects the light of the light source 12 toward the opening (forward). An outwardly protruding flange portion 20 is formed around the opening of the housing 14, and a groove 22 is formed on the front side surface of the flange portion 20 over the entire circumference.

On the other hand, the lens 16 collects light from the light source 12 and the housing 14, and at the same time, the housing 14
In the example shown in the drawing, it has a lid-like shape having an open end having substantially the same diameter as the flange portion 20, and a convex portion 16a is provided on the entire peripheral surface on the open side. It is formed. That is, in the illustrated lamp structure, the groove 16 is filled with a hot-melt adhesive or the like, and the convex portion 16a of the lens 16 is inserted therein, whereby the lens 16 is fixed to the housing 14.

A molded packing 18 is disposed in contact with the rear side surface of the flange portion 20 and is adhered or adhered as necessary. In the lamp structure 10 of the present invention, the molded packing 18 is brought into contact with and in close contact with a joint portion of a member to be mounted such as a body 24 of an automobile or the like, and is fixed by screws, bolts and nuts (not shown), The body 24 is fixed at a predetermined position. That is, the molded packing 18 is brought into contact with and closely adheres to a predetermined position of a member to be attached such as the body 24 of the automobile, and the body 24 and the lamp structure 1 are attached.
It is generated by the force when fixing the lamp structure 10 to the body 24 with screws, bolts and nuts, the temperature change during the use of the lamp structure, the vibration when the vehicle is running, etc. The housing 14 absorbs the force of
It is a joining member for preventing distortion and damage of the body 24.

The molded packing 18 is a characteristic member of the lamp structure 10 of the present invention, and is molded from a thermoplastic elastomer composition having a predetermined composition (hereinafter referred to as an elastomer composition). That is, this elastomer composition has a softening temperature of 100 ° C. or higher and a melting temperature of 200.
A thermoplastic resin (ie, component A) having a temperature of ℃ or less as a matrix, in which at least a part of the rubber composition is vulcanized (ie, component B), the melting temperature is 50 ℃ or more and less than 100 ℃, A composition in which a crystalline thermoplastic polymer composition having a crystallinity of 20% or more (that is, component C) is dispersed, or further, a composition which imparts viscous adhesiveness when the component A is melted (that is, component D) ) Is a basic composition.

Since this elastomer composition has a constitution in which a thermoplastic resin is used as a matrix (continuous phase) and a vulcanized rubber composition is used as a dispersed phase (domain), the temperature is 200 ° C. or lower, which is a relatively low temperature for melt molding. It has good melt fluidity, that is, melt moldability, and visco-adhesiveness at the time of melting, which is imparted as necessary, and can be molded even when heated to a high temperature of 100 ° C. or higher, preferably 120 ° C. or higher. That is, the molding packing 18) has excellent rubber elasticity and good durability such as ozone resistance. Moreover, the lamp structure 1
When 0 is discarded, it can be easily removed and melt-molded again. In the lamp structure 10 of the present invention, by molding the molding packing 24 with such an elastomer composition, as will be described later, the assembly process of the lamp structure 10 is greatly simplified as compared with the conventional one.
Moreover, it enables the recycling of molded packing, which was impossible in the past. Hereinafter, this elastomer composition will be described.

The component A serving as a matrix is a thermoplastic resin composition having a softening temperature of 100 ° C. or higher and a melting temperature of 200 ° C. or lower. If the softening temperature is less than 100 ° C, the heat resistance of the resulting molded article is poor, and the melting temperature is 2
If the temperature exceeds 00 ° C, melt moldability such as extrusion molding and injection molding deteriorates. As the component A, a thermoplastic resin having a softening temperature of 110 ° C. or higher and a melting temperature of 190 ° C. or lower is particularly preferably used.

In the present invention, the softening temperature means JI.
It is a heat distortion temperature defined in SK 7270-1983. More specifically, this heat distortion temperature is a heat distortion temperature measured by a load deflection temperature test method, and is 4.6 kgf /
This is the temperature at which the test piece begins to deform under a constant load of cm ² , that is, the temperature at which it physically deforms by heat. On the other hand, in the present invention, the melting temperature means a differential scanning calorimeter (DSC),
The crystal melting peak temperature of the endothermic curve when measured at a temperature rising rate of 10 ° C./min is shown. Furthermore, the softening point is JIS
The softening point defined by K 6220 is measured by a ring and ball softening point measuring device, and the temperature at which the sphere drops is defined as the softening point (° C).

Further, in the present invention, the component A satisfies the above conditions and is 230 ° C. under a load of 2.16.
kgf / cm ² , MFI (Melt Flo) when using 1mmφ orifice
A thermoplastic resin having a (w Index) of 20 or more and a D hardness of 80 or less specified in JIS K 6310 is preferably used.

As the component A, various thermoplastic resins and / or compositions thereof can be used as long as they have the above characteristics. That is, the component A may be a single thermoplastic resin or a composition, or may be a composition composed of a mixture thereof. Specifically, polyamide-based resin, polyester-based resin, polynitrile-based resin, polymethacrylate-based resin having the above characteristics,
Polyvinyl resin, cellulose resin, fluorine resin,
Suitable examples include imide resins and polyolefin resins. More specifically, as the polyamide resin, nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 1
2 (N12), nylon 610 (N610), nylon 612 (N612), nylon 6/66 copolymer (N6
/ 66), nylon 6/66/610 copolymer (N6 /
66/610), nylon MXD6 (MXD6), nylon 6T, nylon 6 / 6T copolymer, nylon 66 /
PP copolymers, nylon 66 / PPS copolymers and the like; polyester resins include polybutylene terephthalate (PBT) and polyethylene terephthalate (PE
T), polyethylene isophthalate (PEI), PET
/ PEI copolymers, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyesters, aromatic polyesters such as polyoxyalkylene diimidic acid / polybutyrate terephthalate copolymers, and the like; Polyacrylonitrile (PN
A), polymethacrylonitrile, acrylonitrile / styrene copolymer (AS), methacrylonitrile / styrene copolymer, methacrylonitrile / styrene / butadiene copolymer and the like;
Poly (methyl methacrylate) (PMMA), poly (ethyl methacrylate), etc .; as polyvinyl resins, polyvinyl acetate, polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (EVOH), polyvinylidene chloride (PDVC), poly Vinyl chloride (PVC), vinyl chloride / vinylidene chloride copolymer, vinylidene chloride / methyl acrylate copolymer, etc .; Cellulose-based resin is cellulose acetate, cellulose acetate butyrate, etc .; Fluorine-based resin is polyvinylidene fluoride (PVDF),
Polyvinyl fluoride (PVF), polychlorofluoroethylene (PCFE), tetrafluoroethylene / ethylene copolymer, etc .; aromatic polyimide (PI) etc. as the imide resin; olefin alone as the polyolefin resin Or a copolymer, that is, ethylene, propylene, 1-butene, 1-pentene, 3-methyl-butene, 1-hexene, 3-methyl 1-pentene, 4-methyl 1-pentene, 1-octene, etc., alone or Copolymers, further, copolymers of olefin homopolymers or copolymers with other thermoplastic resins, and the like; each are preferably exemplified. Furthermore, polyether resin materials such as polyphenylene oxide are also preferably exemplified. In particular, a polyolefin resin or a polyamide resin, a composition thereof, or a mixture thereof is preferable. Especially,
Polypropylene (PP) for polyolefin resin
Resins, especially polypropylene resins having a stereochemical structure of isotactic, syndiotactic, and atactic, and having a softening temperature of 100 ° C. or higher and a melting temperature of 200 ° C. or lower are suitable. Used. Specifically, MA710 manufactured by Showa Denko,
Commercially available products such as nylon 11 manufactured by Toray Industries, Inc. can be used. Further, in the thermoplastic resin composition used in the present invention, if the softening temperature of the entire thermoplastic resin composition is 100 ° C. or higher and the melting temperature is 200 ° C. or lower, in addition to the above-mentioned thermoplastic resin, for example, The component A may contain 5 to 70% by weight of a thermoplastic resin such as nylon 6 or EVA having a softening temperature of less than 100 ° C. or a melting temperature of more than 200 ° C. Specific examples thereof include Nylon 6 manufactured by Toray Industries, Inc., Evatate (EVA) manufactured by Sumitomo Chemical Co., Ltd., and the like.

In the elastomer composition used in the present invention, the component B dispersed in the component A is a rubber composition at least partially vulcanized (hereinafter, also referred to as a rubber composition). Here, the elastomer composition has a dispersed structure in which at least a part of the component A forms a continuous phase (so-called matrix), and at least a part of the component B and the below-described component C becomes a dispersed phase (domain). Have. By having such a dispersion structure, the melting characteristics (softening characteristics) of the thermoplastic resin phase forming the matrix are utilized, and good fluidity during molding is realized to control extrusion molding and injection molding, especially 200 As a melt molding at a temperature of ℃ or less, it enables easy flow in a relatively low temperature range, and by having a rubber composition in which at least a part of the dispersed phase is vulcanized, the resulting molded article is heat-softened (softened). In addition to the improvement of the temperature), it is possible to exhibit flexibility and good rubber elasticity even when heated.

The rubber composition used as the component B is selected from the group consisting of diene rubbers and hydrogenated products thereof, olefin rubbers, halogen-containing rubbers, silicone rubbers, sulfur-containing rubbers, fluororubbers, and thermoplastic elastomers. One or more selected is preferably illustrated. Specifically, the diene rubber and its hydrogenated product include natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene-butadiene rubber (SBR), butadiene rubber (BR high cis BR and low Cis BR), acrylonitrile-butadiene rubber (NBR), hydrogenated NB
R, hydrogenated SBR, etc .; as the olefin rubber, ethylene / propylene copolymer rubber (EPM), ethylene /
Propylene / diene copolymer rubber (EPDM), maleic acid-modified ethylene / propylene copolymer rubber (M-EP
M), butyl rubber (IIR), copolymer of isobutylene and aromatic vinyl or diene monomer, acrylic rubber (ACM), ionomer, etc .; as halogen-containing rubber, brominated butyl rubber (Br-IIR), chlorinated butyl rubber (Cl-IIR), bromide of isobutylene / paramethylstyrene copolymer (Br-IPMS), chloroprene rubber (CR), hydrin rubber, chlorosulfonated polyethylene (CSM), chlorinated polyethylene (C
M), maleic acid modified chlorinated polyethylene (M-CM)
Etc .; as silicone rubber, methyl vinyl silicone rubber, dimethyl silicone rubber, methylphenyl vinyl silicone rubber, etc .; as sulfur-containing rubber, polysulfide rubber, etc .; as fluororubber, vinylidene fluoride rubber, fluorine-containing vinyl ether rubber, etc. Rubber, tetrafluoroethylene-propylene rubber, fluorine-containing silicon rubber, fluorine-containing phosphazene rubber, etc .; thermoplastic elastomers include styrene elastomers, polyolefin elastomers, polyester elastomers,
Polyurethane-based elastomers, polyamide-based elastomers and the like are preferably exemplified.

Particularly, an olefinic rubber (composition) such as EPM rubber or EPDM rubber (or a rubber composition containing them) is kneaded during the kneading process by the method for producing the thermoplastic elastomer composition of the present invention described later or The thermoplastic elastomer composition of the present invention is preferably used for reasons such as good thermal stability during molding processing such as extrusion molding and injection molding. Among them, EPM and / or EPDM which are binary or ternary copolymers having ethylene and propylene or some diene components such as dicyclopentadiene, ethylidene norbornene and 1,4-hexadiene, and furthermore, Maleic acid-modified EPM and / or EPDM obtained by modifying EPM and / or EPDM with maleic anhydride or the like can be suitably used. Specifically, Toughmer MP manufactured by Mitsui Petrochemical Co., Ltd.
Commercially available products such as 0610 and Mitsui EPT4070 manufactured by Mitsui Petrochemical Co., Ltd. can be used.

In the thermoplastic elastomer composition used in the present invention, the component B contains various additives such as carbon black, a plasticizer, a softening agent, an antioxidant and a processing aid, in addition to the rubber component. Needless to say, the content of the rubber component in the component B is 25 to 9
It is preferably about 9% by weight, particularly about 33 to 98% by weight.

As described above, in this elastomer composition, the component A is used as a matrix, and the component B, the component C described later, and at least a part of the component D described later are dispersed as a dispersed phase (domain) depending on the application. In addition, at least a part of the component B is vulcanized. Such a structure has a thermoplastic resin that constitutes the component A in advance,
The rubber composition constituting the component B (basically containing no vulcanizing agent) is melt-kneaded with a twin-screw kneading extruder or the like to disperse the rubber composition in a thermoplastic resin forming a continuous phase, It can be formed by continuously adding a vulcanizing agent in this state (under kneading) and dynamically vulcanizing the rubber composition during kneading. When adding various compounding agents (excluding vulcanizing agents) to the thermoplastic resin or rubber component, they may be added during the kneading, but it is preferable to add them before kneading.

The type of vulcanizing agent, dynamic vulcanization conditions (temperature, time), etc. may be appropriately determined according to the component B to be added, and there is no particular limitation. As the vulcanizing agent, a general rubber vulcanizing agent (crosslinking agent) can be used. Specifically, as the sulfur-based vulcanizing agent, powdered sulfur, precipitable sulfur, highly dispersible sulfur, surface-treated sulfur, insoluble sulfur,
Dimorpholine disulfide, alkylphenol disulfide, etc. are exemplified, and for example, 0.5 to 4 phr
(Parts by weight per 100 parts by weight of the rubber component (polymer) in the component B) may be used. Further, as the organic peroxide-based vulcanizing agent, benzoyl peroxide, t-butyl hydroperoxide, 2,4-dichlorobenzoyl peroxide, 2,5-dimethyl-2,5-di (t
-Butylperoxy) hexane, 2,5-dimethylhexane-2,5-di (peroxylbenzoate) and the like are exemplified, and for example, about 1 to 15 phr may be used.
Further, examples of the phenolic resin-based vulcanizing agent include a bromide of an alkylphenol resin, a mixed crosslinking system containing a halogen donor such as tin chloride and chloroprene and an alkylphenol resin, and the like. Good. In addition, zinc white (about 5 phr), magnesium oxide (about 4 phr), litharge (about 10 to 20 phr), p-quinone dioxime, p
-Dibenzoylquinonedioxime, tetrachloro-p-
Benzoquinone, poly-p-dinitrosobenzene (2-1)
0 phr), methylene dianiline (0.2 to 10 p
hr).

[0028] If necessary, a vulcanization accelerator may be added. Examples of the vulcanization accelerator include common vulcanization accelerators such as aldehyde / ammonia, guanidine, thiazole, sulfenamide, thiuram, dithioate, and thiourea, for example, 0.5 to 2 phr. The degree may be used. Specifically, hexamethylenetetramine or the like is used as the aldehyde / ammonia-based vulcanization accelerator; diphenyl guazinine or the like is used as the guadinine-based vulcanization accelerator; Sulfide (DM), 2-mercaptobenzothiazole and its Zn salt, cyclohexylamine salt and the like; as the sulfenamide vulcanization accelerator, cyclohexylbenzothiazyl sulfenamide CBS), N
-Oxydiethylene benzothiazyl-2-sulfenamide, Nt-butyl-2-benzothiazole sulfenamide, 2- (thymolpolynyldithio) benzothiazole and the like; as thiuram-based vulcanization accelerators, Tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide, tetramethylthiuram monosulfide (TMTM), dipentamethylenethiuram tetrasulfide, etc .; Zn-dimethyldithiocarbamate, Zn as the dithioate vulcanization accelerator -Diethyldithiocarbamate, Zn-di-n-butyldithiocarbamate, Zn-ethylphenyldithiocarbamate, Te-diethyldithiocarbamate, Cu-dimethyldithiocarbamate, Fe-dimethyldithiocarbamate, pipecoli Pi Pekori Le dithiocarbamate and the like. Examples of the thiourea-based vulcanization accelerator, ethylene thiourea, diethyl thiourea and the like; are disclosed, respectively.

As the vulcanization accelerating aid, general auxiliaries for rubber may be used in combination, for example, zinc white (about 5 phr), stearic acid, oleic acid and their Zn salts (2 to 5). 4 phr) or the like may be used.

In the elastomer composition used in the present invention, for example, when EPM rubber or its maleic acid modified product is used as the component B, methylenedianiline (MDA) is exemplified as a preferable vulcanizing agent. The ratio varies depending on the use of the elastomer composition and the like, but is usually 0.2 to 10 phr, preferably 0.5 to 5 phr.
It is a degree. If necessary, a vulcanization aid may be used in combination. As preferred vulcanization aids, stearic acid, zinc white, zinc stearate and the like are used. Further, as another preferred embodiment of the crosslinking agent, 2,5-dimethyl-2,5-
Organic peroxides such as di (t-butylperoxy) hexane are exemplified, and usually 1 to 10 phr, preferably 1.5 to
About 5 phr is used. Furthermore, E as component B
When performing vulcanization by dynamic heat treatment using PM-based rubber or the like, the kneading temperature of component A and component B during vulcanization (production temperature of the elastomer composition of the present invention) is 180 to
It may be about 300 ° C.

Alternatively, when an EPDM rubber or a maleic acid modified product thereof is used as the component B, powdered sulfur, a preferable vulcanizing agent and a vulcanization accelerator (vulcanizing system),
Examples of the vulcanization system include various vulcanization agents (vulcanization accelerators) of sulfenamide-based, thiuram-based, and thiazole-based singly or in combination of two or more kinds. As a preferable example, a vulcanization system of powdered sulfur / CBS / TMTD / DM is exemplified. Although the amount ratio varies depending on the vulcanizing agent (system), the total amount is usually 0.5 to 10 phr, preferably 0.8 to phr.
5 phr. If necessary, a vulcanization aid may be used in combination. Preferred examples of the vulcanization aid include fatty acids such as stearic acid and fatty acid metal salts such as zinc stearate (the combination thereof). As another preferred embodiment of the crosslinking agent, a resin crosslinking system using a brominated alkylphenol resin is exemplified, and usually 1 to 20 phr, preferably about 3 to 10 phr is used. Furthermore, when vulcanization by dynamic heat treatment is performed using EPDM rubber as the component B, the kneading temperature of the component A and the component B during vulcanization (production temperature of the elastomer composition of the present invention) is It may be similar to the above-mentioned EPM rubber.

In this elastomer composition, component A
The content and composition ratio of the component B and the component B may be appropriately determined depending on the types of the components A and B. Generally, the heat of the component A having a softening temperature of 100 ° C. or higher and a melting temperature of 200 ° C. or lower is used. The weight ratio of the plastic resin and the rubber component (component A / component B) in component B is component A / component B = 5/95 to 95 /
5, preferably component A / component B = 15 / 85-85 /
It is about 15. When the composition ratio of both components is within the above range, the obtained elastomer composition (or a molded product thereof) has a good balance of various properties such as melt moldability, heat softening resistance and rubber elasticity as described above. Can be

More specifically, for example, in a preferred combination, the component A is a polypropylene resin and the component B is
Is an EPM rubber and / or an EPDM rubber, the composition ratio of both components is preferably Component A / Component B.
= About 5/95 to 95/5, and more preferably about component A / component B = 15/85 to 80/20.

As described above, in an elastomer composition in which a vulcanized rubber composition is dispersed with a thermoplastic resin as a matrix, dynamic vulcanization is performed to disperse the rubber composition in the thermoplastic resin. The rubber composition is basically pelletized in an unvulcanized state and mixed with the thermoplastic resin in order to improve the temperature. However, since it is unvulcanized, the rubber composition is too soft and pellets of the rubber composition block each other; the behavior of the pellets inside the feeder such as the feeder is unstable due to mutual adhesion and the feeding speed is not stable. Furthermore, the pellets of the rubber composition have a higher viscosity than the molten thermoplastic resin, and it is difficult to disperse the pellets in a predetermined state in the thermoplastic resin; Is.

On the other hand, in the present invention, the thermoplastic resin (component A) is prepared by adding the crystalline polymer composition (component C) to the rubber composition (component B) in advance.
The rubber composition (mixture) can be stably supplied and dispersed in the thermoplastic resin at a predetermined shape and at a predetermined rate by adding to the vulcanizing agent (crosslinking agent for rubber) in this state. ) Is added to vulcanize dynamically to enable rapid and fine dispersion of the rubber composition in the thermoplastic resin. Moreover, the added crystalline polymer is crosslinked by the vulcanizing agent and loses crystallinity by selecting the type thereof, so that the flexibility of the rubber composition is not deteriorated and, as a result, the elastomer composition is obtained. It is also possible to realize keeping flexible.

The crystalline polymer used in the present invention has a melting temperature of 50 ° C. or higher and 100 ° C. by DSC.
And the degree of crystallinity is 20% or more, comparing the densities before and after heating when the polymer is heated at about 80 ° C., then rapidly cooled at room temperature and left for about 24 hours, preferably crosslinkable Crystalline polymers and compositions. If the melting temperature of the crystalline polymer is less than 50 ° C., the blocking of the mixture of the rubber composition and the crystalline polymer cannot be completely prevented, and thus a stable supply of the mixture to the molten thermoplastic resin is ensured. Can't do, 100
If the temperature is higher than 0 ° C., the resulting elastomer composition may not be flexible, which causes inconvenience. If the crystallinity is less than 20%, the effect of preventing softening of the component B cannot be sufficiently obtained, and similarly, stable supply of the mixture to the molten thermoplastic resin cannot be ensured.

As such a crystalline polymer, a chain or cyclic trans polyoctenemer synthesized by various methods, and trans-1,4 synthesized by various methods are used.
Examples include polyisoprene and gutta-percha mainly composed of trans-polyisoprene components separated from natural rubber.

Since these compounds have the crystallinity as described above in terms of their structure, they are solid and solid at room temperature before crosslinking, but have the characteristics of a thermoplastic resin that softens and melts at 50 ° C. or higher. , Having a double bond in the repeating unit. Therefore, by adding and mixing these crystalline polymers to the unvulcanized rubber composition in advance, the strength of the unvulcanized rubber after cooling can be significantly improved, softening can be prevented, and the pellet blocking phenomenon can be prevented. It is possible to stabilize the transportation of the pellets by the feeder or the like and the supply to the thermoplastic resin. Further, when the unvulcanized rubber composition pellets containing the crystalline polymer are mixed in the melted thermoplastic resin, the crystalline polymer is rapidly melted by heat, so that the viscosity of the rubber composition is increased. And enables rapid and fine dispersion of the rubber composition and the crystalline polymer in the thermoplastic resin. Moreover, after adding and mixing the above pellets to the thermoplastic resin and further adding the vulcanizing agent, in the case of the crystalline polymer having a double bond in the molecule as described above, the vulcanizing agent for rubber is used. It is vulcanized and dispersed and fixed in a thermoplastic resin in a structure in which at least a part of the rubber composition is crosslinked, and since the vulcanized material exhibits rubber elasticity, it is crystallized even after the elastomer composition is cooled to room temperature. Since the crystalline polymer does not exhibit crystallinity and the hardness of the dispersed phase does not increase, a flexible elastomer composition can be obtained without adversely affecting the physical properties of the obtained elastomer composition.

As mentioned above, the trans polyoctenemer exemplified as the polymer having such characteristics is a ring-opening polymer of 1,5-cyclooctadiene,
Depending on the production method, there are linear polymers represented by the following formula (1) and cyclic polymers represented by the following formula (2).

Embedded image In the formula, n is an integer of 80 to 4000, particularly 400 to 1600.

Both of these are solid at room temperature,
It is a thermoplastic resin that softens and melts at 100 ° C, and because it has a double bond in the repeating unit, it can be vulcanized and the vulcanized product exhibits rubber elasticity. When trans-polyoctenemer is used as the crystalline polymer, its molecular weight is not particularly limited, but in terms of improving the hardness of pellets and dispersing the rubber composition and the crystalline polymer in the thermoplastic resin, 1 It is preferable to use one having a viscosity of about 10,000 to 500,000, particularly about 50,000 to 200,000. The melting temperature is 50-80.
A material having a crystallinity of about 15 ° C., particularly about 51 ° C., and a crystallinity of about 15 to 40%, particularly about 27% is preferably used. Specifically, VELSTENAMER 801 manufactured by Huls
A commercially available product such as 2 can be used.

The trans-1,4-polyisoprene (TPI) is represented by the following formula (3).

Embedded image In the formula, m is 145 to 14500, especially 725 to 7250.
Is an integer.

As shown in the above formula (3), trans-1,4-polyisoprene also has a double bond in its repeating unit, is solid at room temperature, and is 50 to 100 ° C.
Since it is a thermoplastic resin that softens and melts at, sulfur used for vulcanization of ordinary rubber compositions, sulfur-containing vulcanizing agents,
It can be vulcanized with a vulcanization accelerator or the like, and the same effects as those of the above-mentioned transpolyoctenemer can be obtained. Similarly, naturally, trans-1,4-polyisoprene (so-called gutta-perger), which is a specific form of natural rubber (polyisoprene), can also be suitably used. As such trans-1,4-polyisoprene, the molecular weight is about 10,000 to 1,000,000, particularly about 50,000 to 500,000, and the proportion of trans-1,4 bonds is 90 mol% or more, particularly 98 mol% or more, crystalline The degree of chemical conversion is 20 to 50%, especially 30 to
A material having a melting temperature of about 50% and a melting temperature of 50 to 100 ° C., particularly about 50 to 80 ° C. is preferably used. Specifically, a commercially available product such as Kuraray TP-301 manufactured by Kuraray Co., Ltd. can be used.

As the crystalline polymer composition, such a crystalline polymer may be used alone, or a combination of a plurality of crystalline polymers and the composition thereof, or 1
Addition of other non-crosslinking crystalline polymer, reinforcing agent, softening agent, plasticizer, filler, processing aid, lubricant, antioxidant, pigment, etc. to one or more crystalline polymers The composition may be used.

In the present invention, the amount of the crystalline polymer composition blended (contained) is not particularly limited, but the above-mentioned effect of adding the crystalline polymer can be surely exhibited, and the heat resistance of the molded product and the rubber can be improved. In terms of obtaining an elastomer composition having good properties such as elasticity, the crystalline polymer is added in an amount of 5 to 500 parts by weight relative to 100 parts by weight of the rubber composition.
It is preferred to incorporate a crystalline polymer composition. Further, by setting the blending amount of the crystalline polymer to 5 to 450 parts by weight with respect to 100 parts by weight of the rubber composition, the above tendency becomes more remarkable and more preferable results can be obtained.

The elastomer composition of the present invention basically has the above-mentioned composition and constitution, but in addition to this, a vulcanization accelerator, an antioxidant, an antioxidant, an ultraviolet absorber, a pigment or a dye. Colorants such as, fillers, softeners, plasticizers, and reinforcing agents such as carbon black and silica may be added and kneaded as necessary. Furthermore, as a preferred embodiment, after completion of vulcanization and addition / kneading of additives, or before addition of these additives, a tackifier is added as component D and kneaded to obtain an elastomer composition. Good.

By containing the tackifier as the component D in the elastomer composition, the obtained molded article of the elastomer composition can exhibit tackiness. Therefore, when the molded product is used by adhering it to various members such as a shock-absorbing material having a more complicated shape, by directly molding it with a mold having the target shape, the molded product or the product comes into contact with it. It becomes possible to attach the members, and the product assembling process can be greatly simplified.

There is no particular limitation on the resin composition and / or the rubber composition which can be used as the tackifier of the component D of the present invention, and the adhesive composition is suitable for the elastomer composition, particularly the thermoplastic resin, used in the present invention. It is possible to use all compositions capable of imparting the above properties and not deteriorating properties such as melt moldability, heat softening resistance, and rubber elasticity of the elastomer composition (molded product), but preferably styrene-butadiene ( Styrene) copolymer elastomer or hydrogenated product thereof, styrene-isoprene (.styrene) copolymer elastomer or hydrogenated product thereof, resinous composition having a softening temperature of 60 to 150 ° C. or hydrogenated product thereof, petroleum resin or The hydrogenated product, terpene resin or its hydrogenated product, rosin resin or its hydrogenated product, coumarone / indene resin Alternatively one or more of a hydrogenated product thereof are preferably used.

Among them, hydrogenated products of styrene / butadiene / styrene copolymer elastomer (SEBS), styrene / isoprene / styrene copolymer elastomer (S
IS) and hydrogenated products thereof are preferably used. Specifically, commercially available products such as Tuftec P-073 manufactured by Asahi Kasei Corporation and Escorets 5320 manufactured by Tonex can be used.

These tackifiers have a softening point (or softening temperature) of 60 to 150 ° C., unless otherwise specified.
It is preferred to use When a tackifier having a softening point of less than 60 ° C. is used, the thermoplastic elastomer composition is likely to be excessively softened by heat.
There is a high possibility that the melt fluidity at a temperature of ℃ or less will be low, which may cause problems in moldability.

In the elastomer composition used in the present invention, the addition amount of these tackifiers is not particularly limited, but usually, preferably thermoplastic resin +
About 1 to 100 parts by weight, more preferably 5 to 8 parts by weight based on 100 parts by weight of the total of the rubber composition and the crystalline polymer composition.
It is about 0 parts by weight. By setting the content of the tackifier in the above range, good adhesiveness can be realized without lowering the rubber elasticity, heat-softening property, melt fluidity, etc. of the elastomer composition (molded product).

In the method for producing the thermoplastic elastomer composition used in the present invention as described above, it can be produced by a known method for producing a thermoplastic resin composition, but a batch type production method may be used. Alternatively, use a twin-screw kneading extruder or the like that continuously supplies and melts a thermoplastic resin and sequentially adds and kneads a rubber composition, a vulcanizing agent, etc. while transferring while kneading to produce an elastomer composition. You may utilize for the continuous manufacturing method mentioned above. An example of a preferable method for producing the elastomer composition will be shown below.

In the production of this elastomer composition,
The machine used for kneading the components A, B, C or further D is not particularly limited, but a screw extruder, a kneader, a Banbury mixer, a twin-screw kneading extruder and the like are exemplified. Above all, it is preferable to use a twin-screw extruder in consideration of kneading of component A (thermoplastic resin) and component B (rubber composition) and dynamic vulcanization of component B. Further, two or more kinds of kneaders may be used and kneading may be sequentially performed. The kneading temperature may be any temperature that is higher than the temperature at which the component A melts. The shear rate during kneading is preferably 2500 to 7500 sec ^-1 .
The total kneading time is preferably 30 seconds to 10 minutes, and the vulcanization time after adding the vulcanization system is preferably 15 seconds to 5 minutes.

Hereinafter, one example of the production method will be described more specifically based on the kneading by a commonly used twin-screw kneader.
First, a pellet-shaped component A is charged from a first charging port of a twin-screw kneader, mixed by a twin-screw, melted and heated.

On the other hand, the components B and C are combined together by using a kneading machine for rubber such as a Banbury mixer, and after adding a reinforcing agent, a softening agent, an antiaging agent, etc. to the rubber components as necessary, the mixture is kneaded. A so-called masterbatch containing no sulfur system is formed into a sheet having a thickness of 2 to 2.5 mm with a rubber roll or the like, and the sheet is pelletized with a rubber pelletizer to be prepared. As described above, the component A is added to 2
After melting and heating with a shaft kneader, the mixture of the component B and the component C thus pelletized in advance is charged from the second charging port of the biaxial kneader, and the component B and the component C are added to the component A. Disperse. When component B is added, a processing aid such as stearic acid may be used together. In this case, the component B may be mixed with stearic acid or the like using a Banbury mixer or the like, and then pelletized as described above and charged into the components of the biaxial kneader.

After that, a vulcanizing agent or a vulcanization aid is further charged from the third charging port of the twin-screw kneading machine, and the component B is vulcanized (dynamically vulcanized) under kneading. By carrying out the vulcanization in this way, vulcanization is carried out in a state in which the component B and the component C are sufficiently dispersed in the component A, and the component B and the component C are in a sufficiently fine state, and the continuous phase (matrix) ), Component B, which is at least partially vulcanized as a disperse phase (domain), is stably dispersed in component A which forms), and when component C is also a vulcanizable polymer, it is simultaneously vulcanized.
The elastomer composition of the present invention, which is stably dispersed, can be preferably produced, and favorable results can be obtained in terms of melt flowability, rubber elasticity, etc. of the obtained elastomer composition (molded product).

If necessary, additives such as an antioxidant are added and kneaded from the fourth charging port of the twin-screw kneader and thereafter,
In addition, the elastomer composition of the present invention can be obtained by adding the component D (tackifier) as necessary according to the application and kneading. The addition timing of the component C and / or the component D is not limited to the end of the above-mentioned step, and the addition of the component A
It may be at the time of melting or the addition of the component B. In particular, when the component C is added, it is necessary to add the component C at the stage of pelletizing the component B before mixing the component A and the component B and sufficiently knead the rubber elasticity of the obtained vulcanizate. It is preferable in terms of blocking resistance of pellets of the rubber composition.

The elastomer composition thus obtained is extruded in a strand form by a twin-screw kneading extruder, pelletized by a resin pelletizer, and the pellets are used to prepare an extruder having a melt extrusion mechanism or a simple extrusion. It is possible to perform extrusion or injection molding into molds having various shapes by using a machine, a general resin injection molding machine or a simple injection molding machine.

The lamp structure 10 of the present invention forms the molding packing 18 using such an elastomer composition. Hereinafter, an example of the manufacturing method of the lamp structure 10 of the present invention (that is, the manufacturing method of the present invention) will be described.

First, similar to the conventional lamp structure,
The housing 14 and the lens 16 (or further the lamp 12) are combined to assemble the structure body. A molding die is attached to the back surface of the flange portion 20 of the housing 14 or the joint portion of the body 24 that is the attachment target member. Alternatively, the structure body and the body 24 are preliminarily positioned at predetermined positions and a molding die is mounted. Then, the above-mentioned elastomer composition is melted and injected through an injection port optionally provided in this mold. As mentioned above, this elastomeric composition has good melt moldability or, if desired, tackiness. Therefore, the molded packing 18 can be directly molded by melt molding such as injection molding, and can be adhered or adhered to a predetermined position as required. After that, the elastomer composition is cooled and cured, and then the molding die is removed, and the structure body and the body 24 are inserted through the obtained molding packing 18.
And are fixed by bolts or the like as required, and the manufacturing of the lamp structure 10 of the present invention and the mounting on the body 24 which is the mounting target member are completed.

In the conventional steps of assembling the lamp structure and attaching it to the body which is the attachment target member, if the method uses a vulcanized rubber sheet, for example, assembling of the structure body, punching of the molding packing, molding packing Are required, the process of adhering the molded packing, the process of adhering the molded packing, the fixing of the molded packing to the lamp structure or the body, the transfer to the mounting portion of the structure body, and the mounting process of the structure body to the body.

On the other hand, according to the present invention, the same work is performed by assembling the structure body, transferring the structure body to the mounting portion, attaching the molding die, molding the elastomer composition, and the body of the structure body. It can be carried out by simply attaching to, and the process can be greatly simplified. Moreover, the molded packing is composed of the component B and the component C as described above.
Since it has a structure in which is dispersed, it exhibits heat-softening resistance that conventional hot melts do not have, and it also has excellent rubber elasticity even at high temperatures of 100 ° C or higher, so it is not affected by heating or vibration due to running. Even in this case, the lamp structure and the member to be attached can be reliably brought into close contact with each other, and the lamp structure and the member to be attached can be held and fixed without damage.
Furthermore, in the case where the elastomer composition contains the component D, the adhesive or the like used as necessary can be made unnecessary by virtue of its viscous adhesion property, and the process can be further simplified. .

The molding method using the elastomer composition may be a method usually used for molding conventionally used hot melt materials, such as extrusion molding using a simple mold and injection molding. Can be molded. The melting conditions may be appropriately determined depending on the characteristics of the elastomer composition and the shape of the molded product, but usually the melting temperature is about 150 to 250 ° C., preferably 160 to 20.
It is about 0 ° C.

The lamp structure of the present invention and the method for manufacturing the lamp structure have been described above in detail. However, the present invention is not limited to the above-described structure, and various improvements and changes can be made without departing from the scope of the present invention. Of course it is good.

[0064]

EXAMPLES The following will describe the lamp structure of the present invention and the manufacturing method thereof in more detail with reference to specific examples of the present invention.

(Examples 1 to 11 and Comparative Examples 1 to 6)
Component A (thermoplastic resin), component B (rubber composition) and component C (crystalline polymer composition) shown below, and component D (adhesiveness imparting agent) and vulcanization system are constituted depending on the application. Using each compounding agent, various elastomer compositions shown in Table 1 below were produced as follows. First,
Each of the compounding agents constituting the component B or further the component C is put into a closed type Banbury mixer for rubber and kneaded, and then molded into a rubber sheet having a thickness of 2.5 mm by using a rubber roll, and a master is prepared. A batch was made. Pellet this masterbatch sheet with a rubber pelletizer,
Pellets of a mixture of component B and component C were made.

Next, the component A is charged into the first charging port of the twin-screw kneading extruder to dissolve and knead the component A, and then the pellets of the mixture prepared above are discharged from the second charging port. Then, the components B and C were added to the component A and kneaded.
After that, the vulcanization system and the antioxidant (pentaerythrityl tetrakis [3- (3,5-di-t-
Butyl-4-hydroxyphenyl)] propionate
Irganox 1010 (manufactured by Nippon Ciba Geigy Co., Ltd., amount of 0.1 part by weight) was added and kneaded to dynamically vulcanize the component B and the component C dispersed as domains in the matrix of the component A. The elastomer composition thus mixed was extruded in a strand form from a twin-screw kneader, and further pelletized (a cylindrical shape having a diameter of 3 mm and a length of 3 mm) by a pelletizer for resin.

The above elastomer composition is produced by so-called continuous production, in which the component A is continuously supplied and melted, and the pellets and vulcanization system of the mixture are sequentially added and kneaded while transferring while kneading. Went by. The kneading was carried out at a kneading rotation speed of 150 to 250 rpm and a discharge amount of 10
-20 kg / h, and the resin temperature at the time of kneading the component A is 19
The temperature was 0 to 220 ° C., the kneading resin temperature after adding the mixed pellets was 220 to 240 ° C., and the kneading resin temperature after adding the vulcanization system was 200 to 220 ° C.

Further, the softening temperature and melting temperature and the crystallinity of each component shown in Table 1 were measured as follows. [Softening temperature] According to the deflection temperature test method defined in JIS K 7270-1983, the temperature at which the test piece starts to deform under a constant load of 4.6 kgf / cm ² , that is, the temperature at which it physically thermally deforms is softened. The temperature (° C) was used. [Melting temperature] The crystal melting peak temperature of the endothermic curve when measured with a differential scanning calorimeter (DSC) at a temperature rising rate of 10 ° C / min was defined as the melting temperature (° C). [Crystallinity] After melting the crystalline polymer at 90 ° C.,
It was rapidly cooled to 23 ° C. and left for 24 hours. In the above step, the density of the molten product and the density after standing for 24 hours were measured, and the crystallinity (%) was calculated from the ratio.

The components shown in Table 1 are as follows. [Component A-related] PP; Polypropylene resin MA710 Showa Denko N11; Nylon 11 BESNO TL Toray EVA EVA; Ethylene-vinyl acetate copolymer Evatate K2010 Sumitomo Chemical N6; Nylon 6 CM1041 Toray Co., Ltd.

[Component B Related] EPM-g-MAH; Maleic anhydride modified ethylene.
Propylene Copolymer Rubber Tufmer MPO610 Mitsui Petrochemical Co., Ltd. EPDM; Ethylene / Propylene / Diene Copolymer Rubber Mitsui EPT4070 Mitsui Petrochemical Co., Ltd. Softening Agent; Paraffin Oil Sambar 2280 Nippon San Oil Co., Ltd.

[Component C Related] TPO-1; Transpolyoctenemer VESTENAMAER 8012, manufactured by Huls, TPO-2; Transpolyoctenemer VESTENAMER 6213, manufactured by Huls, TPI; Trans-1,4-polyisoprene, Kuraray TP-301 Manufacture dusting; White carbon Nipsyl VN3 made by Nippon Silica

[Component D Related] SEBS; Styrene / Ethylene Butylene / Styrene Copolymer Tuftec P-073 Asahi Kasei Petroleum Resin; Hydrogenated Petroleum Resin Escoletz 5320
Manufactured by Tonex Co., Ltd. Among the products related to the above component D, the softening point of petroleum resin is J
The softening point specified in IS K 6220 was measured by a ring and ball softening point measuring device, and the temperature when the sphere was lowered was defined as the softening point (° C). The softening temperature of SEBS is the same as that of other components.

[Vulcanization System] Vulcanization System 1; Stearic Acid / MDA = 1.0 / 0.6
(= 1.6) Vulcanization system 2; ZnO / stearic acid / S / PZ / TRA
/TT/CZ=5.0/1.0/0.5/1.0/0.
5 / 0.5 / 1.0 (= 9.5) In the above-mentioned vulcanization system, stearic acid; beads stearic acid MFA manufactured by NOF CORPORATION; methylenedianiline Sumicure M; ZnO manufactured by Sumitomo Chemical; zinc white zinc white No. 3 manufactured by Shodo Kagaku Co., Ltd. S; Sulfur, Karuizawa Seirensho PZ; Zn-dimethyldithiocarbamate Noxceller PZ, Ouchi Shinko Kagaku Co., Ltd. TRA; Disulfide Noxceller TT, manufactured by Ouchi Shinko Chemical Co., Ltd. CZ; N-cyclohexyl-2-benzothiazolesulfenamide, Noxeller CZ-G, manufactured by Ouchi Shinko Chemical Co., Ltd.

The following various measurements were carried out using the pellets of the elastomer composition obtained as described above and the pellets of the mixture prepared from the component B and the component C. [Blocking resistance] After pellets of the mixture of the component B and the component C prepared as described above are left at room temperature for 48 hours,
After sufficiently stirring by hand and visually observing, those with no block lumps are shown as "○" as having blocking resistance, and those with block lumps as "No" as blocking resistance. It was [Stability of Blocking Resistance] Pellets of the mixture of the component B and the component C prepared as described above are left at room temperature for 20 to 24 hours, and then supplied to a twin-screw kneading extruder to knead to obtain a composition. It was The initial D hardness of this composition and the D hardness after standing for 1 hour were measured, and the blocking resistance against mechanical strain breakage by a feeder and the like and the supply stability were investigated from the difference between the two. The smaller the difference in D hardness at the initial stage and after 1 hour, the better both properties can be evaluated. The D hardness is measured by pressing the obtained composition using a press molding machine at a temperature of 200 ° C. and a pressure of 10 kgf / cm ² to a thickness of 2 mm for 10 minutes to prepare a sample for D hardness measurement. Using this sample, the hardness (type D) was measured according to JIS K6301.

[Softening Temperature] Using the obtained pellets of the elastomer composition, a measurement sample similar to that for the above-mentioned D hardness measurement was prepared, and in accordance with JIS K 7210-1983, 4.6 kgf / cm ² The temperature (° C.) at which thermal deformation starts under the load was measured. [Compression set] In accordance with JIS K 6301, a sample having a predetermined shape was prepared using an elastomer composition under the same molding conditions as the D hardness measurement sample, and the sample was heated at 100 ° C to 70 ° C.
Time treatment was performed and the compression set (%) at 25% compression was measured.

[Melten Flow Test] 50 g of pellets of the elastomer composition obtained as described above were weighed,
It was placed in a 100 ml stainless steel container. This stainless steel container was allowed to stand in an oven at 200 ° C. for 2 hours, and the state of pellets in the container after standing was observed to evaluate the melt fluidity. The evaluation criteria are as follows. ◯: Melted state and deformed into the shape of the container Δ: Deformed, but the pellet is in a distinguishable state ×: Undeformed and the pellet maintains its shape Above results Is shown in Table 1 below.

[Production of Lamp Structure] The structure body of the lamp structure 10 as shown in FIG. 1 (the assembly of the housing 14, the lens 16 and the lamp 12) is manufactured in the same manner as in the production of a normal lamp structure. Was produced. The structure body and the mounting target member corresponding to the lamp structure 10 were previously positioned at predetermined positions, and a molding die having a single injection port was arranged between them. The metal surface was previously coated with a chlorinated rubber primer. Next, the pellets of the elastomer composition prepared as described above were filled in a small extruder for resin and injected into the molding die through the injection port described above. After the elastomer composition has cooled sufficiently,
The molding die was removed to obtain a lamp structure 10 as shown in FIG. On the other hand, similar to the conventional lamp structure, a similar lamp structure 10 is manufactured by using a molded packing having a thickness of 1.5 mm obtained by punching out a vulcanized rubber sheet of an ethylene / propylene / diene copolymer rubber composition. (Reference Example 1). A chlorinated rubber-based primer and a chloroprene rubber-based adhesive were applied to the contact surface between the metal surface and the molded packing.

The following evaluations were carried out on the various types of lamp structures obtained.

[Man-hours] The man-hours required for assembling the structure body to the member to be mounted and completing the lamp structure 10 after the structure body is manufactured are obtained by punching out the conventional vulcanized rubber sheet. The case where packing was used (Reference Example 1) was evaluated as 100.

[Deformation recovery of structure] Under heating at 100 ° C, the structure main body and the member to be attached are crimped by using a predetermined jig so that the stress per contact area is 5 kg / cm ^2. And left for 24 hours. When the average distance between the structure body and the member to be mounted is 50% or less of the initial value after 24 hours or there is a contact portion between them, x indicates that both do not contact at all,
Moreover, when the distance between the two exceeds 50% of the initial distance, it was evaluated as ◯.

[Structure Adhesion] A measuring jig was attached to the structure body, and the total peeling force between the structure body and the member to be mounted under heating at 100 ° C. was measured using an autograph.
A value obtained by dividing the total peeling force by the total contact area between the structure body and the member to be attached was measured as the structure adhesion force. When this value was 3 kg / cm ² or more, it was evaluated as ○, and when it was less than 3 kg / cm ² , it was evaluated as ×. If this is not possible, auxiliary means such as mechanical fixing of the lamp structure will be required, so that the optimal man-hour reduction is not necessarily achieved. The above results are shown in Table 1 below. The amounts of each component in Table 1 are parts by weight.

[0082]

[Table 1]

[0083]

[Table 2]

[0084]

[Table 3]

As shown in Table 1, in Reference Example 1 using the molded packing prepared by punching out a vulcanized rubber sheet, the lamp structure has sufficient deformation resistance, but
There is no adhesion as it is, and the number of steps is larger than that of the product of the present invention.

On the other hand, in the example of using the elastomer composition for the lamp structure, the thermoplastic resin has a softening temperature of 100 ° C.
In Comparative Example 1 using less than ethylene-vinyl acetate copolymer (EVA), it is possible to prepare a molded packing by melt molding using the elastomer composition, and the number of steps is 70.
However, since the heat resistance and softening resistance of the elastomer composition is low, the deformation resistance (deformation recovery) of the lamp structure is low, and the adhesion cannot be obtained. Further, in Comparative Example 2 in which only nylon 6 having a melting temperature of 215 ° C. was used as the thermoplastic resin, it was not possible to manufacture a molded packing by melt molding using an elastomer composition, and thus a lamp structure could not be manufactured. It was

Further, the component C is used as an elastomer composition having a melting temperature within the range of the component A of the present invention of 160 ° C. by adding a polypropylene resin to an ethylene-vinyl acetate resin having a low melting temperature of 84 ° C. If not, regardless of the type of rubber used, blocking of the rubber composition occurred during biaxial kneading, and a stable thermoplastic elastomer could not be obtained (Comparative Examples 3 and 5). On the other hand, when TPO-1 (trans polyoctenemer) having a crystallinity of 27% and 20% or more and a melting temperature of 51 ° C. or 50 ° C. or more is used as the component C, good blocking resistance is obtained. Thus, it was possible to obtain a stable thermoplastic elastomer composition having hardness, softening resistance, and melt fluidity (Example 1). Further, using this composition as a lamp structure, a molded packing can be easily produced by melt molding using the above-mentioned extruder and molding die.
The number of steps can be reduced to 70 as compared with 100 of Reference Example 1 using punching packing, and good deformation recovery of the lamp structure could be obtained (Example 1). However, since the adhesion of the lamp structure cannot be obtained by blending this elastomer composition, mechanical fixing such as bolting is required.

On the other hand, the same composition as in Example 1 was used, but as the component C, the crystallinity was less than 20% and the melting temperature was 5%.
It can be seen that when TPO-2 (trans polyoctenemer) having a temperature of less than 0 ° C. is used, sufficient blocking resistance of the rubber composition cannot be obtained and a stable thermoplastic elastomer composition cannot be obtained (Comparative Example 4). ). Further, even if TPI having a crystallinity of 20% or more and a melting temperature of 50 ° C. or more is used as the component C,
It can be seen that it has a good effect as in the case of using PO-1 (Examples 2 and 4). That is, when TPO-1 and TPI having crystallinity are used as the component C, a stable thermoplastic elastomer having blocking resistance regardless of the type of rubber and similarly stable can be obtained. Excellent in production and deformation recovery (Examples 1 to 3). Further, the amount ratio of the thermoplastic resin composition (component A) / rubber composition (component B) / crystalline polymer composition (component C) was 18
From 0/10/45 to 60/70/15, it can be seen that the rubber component has good properties, lamp moldability and deformation recovery over a relatively small amount to a large amount (Examples 5 and 6). Furthermore, it has been found that even if it contains a polyamide-based resin, a combination system using as a base a resin having a softening temperature of 100 ° C. or higher and a melting temperature of 200 ° C. or lower can similarly obtain good results. (Examples 7 to 9),
Further, it can be seen that when the crystallinity of the component C is less than 20%, there is no blocking resistance (Comparative Example 6). Furthermore, when an adhesive component is used as the component D, in addition to the above-mentioned effects, when molded into a lamp structure, the adhesive strength is further improved, and mechanical fixing can be eliminated, resulting in more man-hours. Can be reduced and efficient lamp production can be achieved (Examples 10 and 11). From the above results, the effect of the present invention is clear.

[0089]

As described in detail above, according to the present invention, the step of attaching the molded packing is performed only by directly forming the molded packing on the housing or the like by melt molding such as injection molding or extrusion molding. Can be performed, the assembly process of the lamp structure can be greatly simplified, the manufacturing efficiency can be significantly improved, and the lamp structure can be realized at a low price and with a low defective rate due to the manufacturing process. . Moreover, this packing is required as a packing for the lamp structure and exerts sufficient performance, and the packing can be easily removed from the lamp structure when the lamp structure is discarded, and after the removal. The packing can be melt-molded again, that is, recycled.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an example of a lamp structure of the present invention.

[Explanation of symbols]

 10 Lamp Structure 12 Light Source 14 Housing 16 Lens 16a Convex 18 Molded Packing 20 Flange 22 Groove 24 Body

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location F21V 17/00 360 F21V 17/00 360Z 31/02 31/02

Claims (3)

[Claims] 1. A light source, a housing for holding the light source in a predetermined position and reflecting light from the light source on an inner wall surface, and a lens for condensing the light source and the light from the housing and closing the housing. And a packing which is mounted on an outer wall surface of the housing and serves as a joint member between the material to be attached and the lamp structure, the packing containing the following components A, B and C:
A lamp structure characterized by being formed by a thermoplastic elastomer composition in which at least a part of components B and C is dispersed in component A. Component A: Thermoplastic resin composition having a softening temperature of 100 ° C. or higher and a melting temperature of 200 ° C. or lower Component B: A rubber composition at least partially vulcanized Component C: Melting temperature of 50 ° C. or higher and lower than 100 ° C. And
And a crystalline thermoplastic polymer composition having a crystallinity of 20% or more 2. The component A is a polyolefin resin and / or a polyamide resin, the component B is an ethylene / propylene copolymer rubber composition and / or an ethylene / propylene / diene copolymer rubber composition, and The lamp structure according to claim 1, wherein the crystalline thermoplastic polymer is trans polyoctenemer and / or trans-1,4-polyisoprene. 3. A light source, a housing for holding the light source at a predetermined position and reflecting light from the light source on an inner wall surface, and a lens for condensing the light source and the light from the housing and closing the housing. A method of manufacturing a lamp structure, comprising: a packing that is mounted on an outer wall surface of the housing and serves as a bonding member with a mounting target, wherein the mounting target member to which the lamp structure is mounted and / or the housing is bonded. A thermoplastic elastomer composition in which a molding die is attached to a part, and the following components A, B and C are contained in the molding die, and at least a part of the components B and C is dispersed in the component A: After melt-injection and after the thermoplastic elastomer composition is cured, the molding die is removed, and the cured product is used as the packing in the housing. A method of manufacturing a lamp structure, wherein the lamp structure is manufactured by joining a member to be attached and a member to be attached. Component A: Thermoplastic resin composition having a softening temperature of 100 ° C. or higher and a melting temperature of 200 ° C. or lower Component B: A rubber composition at least partially vulcanized Component C: Melting temperature of 50 ° C. or higher and lower than 100 ° C. And
And a crystalline thermoplastic polymer composition having a crystallinity of 20% or more