JPH0578526A - Thermoplastic resin composition - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a thermoplastic resin composition excellent in mechanical properties and surface properties that combine the properties of polyolefin and polyester. [Structure] 2% by weight of (a) polyester and (b) modified polyolefin modified with an unsaturated glycidyl compound
A polyolefin containing the above and (c) a styrene-based thermoplastic elastomer modified with an unsaturated carboxylic acid or a derivative thereof are contained, and the ratio of the components (a) and (b) is (a) / ( b) = 2/98 to 98/2, and the content of the component (c) is 100 in total of (a) + (b).
The thermoplastic resin composition is 2 to 40 parts by weight with respect to parts by weight.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a thermoplastic resin composition containing a polyester and a polyolefin. More specifically, polyester and polyolefin are well compatible with each other and have excellent mechanical properties such as impact resistance and mechanical strength, and surface properties such as appearance. The present invention relates to a thermoplastic resin composition suitable for molded articles and the like.

[0002]

2. Description of the Related Art Polyester has heat resistance,
It is a resin with excellent mechanical strength and insulation. On the other hand, polyolefin has the features of being lightweight, excellent in impact resistance, and good in moldability. Therefore, attempts have been made to prepare a resin composition having the advantages of both by blending polyester and polyolefin, each of which has excellent characteristics. However, since the compatibility between polyester and polyolefin is poor, there is a problem that the thermoplastic resin composition containing both is reduced in impact resistance, mechanical strength, and the like, resulting in surface peeling of a molded product.
Therefore, by blending a thermoplastic resin composition containing a polyester and a polyolefin with an unsaturated carboxylic acid or a derivative thereof, particularly a polyolefin modified with an anhydride of an unsaturated dicarboxylic acid such as maleic anhydride (MAH), Although the compatibility of both has been improved, the mechanical properties and surface properties are still insufficiently improved. Therefore, an object of the present invention is to provide a thermoplastic resin composition in which polyester and polyolefin are well compatibilized and which have excellent mechanical properties and surface properties.

[0003]

Means for Solving the Problems As a result of intensive studies by the present inventors, in a composition of polyester and polyolefin, a specific amount of a modified polyolefin modified with an unsaturated glycidyl compound and an unsaturated carboxylic acid or a derivative thereof. When blended with a specific amount of modified styrene-based thermoplastic elastomer modified with, polyester and polyolefin are well compatibilized, and excellent in mechanical properties and surface properties,
In particular, they have found that a thermoplastic resin composition having improved elongation at break and surface peeling can be obtained, and arrived at the present invention. That is, the present invention comprises (a) polyester,
(B) a polyolefin containing 2% by weight or more of a modified polyolefin modified with an unsaturated glycidyl compound, and (c)
And a styrene-based thermoplastic elastomer modified with an unsaturated carboxylic acid or a derivative thereof, wherein the component (a)
And the ratio of (b) is (a) / (b) = 2 / by weight ratio.
98 to 98/2, and the content of the component (c) is (a) +
It is 2-40 weight part with respect to 100 weight part of total of (b), It is a thermoplastic resin composition characterized by the above-mentioned.

Hereinafter, the thermoplastic resin composition of the present invention will be described in detail. (A) of the thermoplastic resin composition component of the present invention
Polyester is a thermoplastic resin generally obtained by polycondensation of a saturated dicarboxylic acid and a saturated dihydric alcohol,
Examples thereof include polyethylene terephthalate, polypropylene terephthalate, polytetramethylene terephthalate (polybutylene terephthalate), polyhexamethylene terephthalate, polycyclohexane-1,4-dimethylol terephthalate, and polyneopentyl terephthalate. Of these, polyethylene terephthalate and polybutylene terephthalate are preferred.

The polyester as the above component (a) is
The intrinsic viscosity [η] (dl / g) obtained from the solution viscosity measured at 25 ° C in an o-chlorophenol solvent is 0.30 to 1.
It is preferable that the terminal carboxyl group has a terminal carboxyl group concentration of 10 to 200 meq / kg. In the case of polyethylene terephthalate, it is preferable that the intrinsic viscosity [η] is 0.30 to 1.2 and the terminal carboxyl group concentration is 10 to 200 meq / kg.
The terephthalic acid component in polyethylene terephthalate may be substituted with an alkyl group, a halogen group or the like, and the glycol component may be up to about 50% by weight of another glycol such as 1,4-, in addition to ethylene glycol.
It may contain butylene glycol, propylene glycol, hexamethylene glycol and the like. In the case of polybutylene terephthalate, the intrinsic viscosity [η] is 0.30
Preferably, the terminal carboxyl group concentration is 10 to 200 meq / kg. Also in this case, the terephthalic acid component may be substituted with an alkyl group, a halogen group or the like, and the glycol component may be 1,4-butylene glycol or another glycol such as ethylene glycol or propylene glycol up to about 50% by weight. Hexamethylene glycol and the like may be contained.

The thermoplastic resin composition component (b) of the present invention
With polyolefin, ethylene and propylene, butene-1, hexene-1,3-methylbutene-1,4-
Methyl-pentene-1, heptene-1, octene-1,
Homopolymers of α-olefins having 3 or more carbon atoms such as decene-1, copolymers of two or more types of monomers such as random, block and graft, mixtures thereof, ethylene or α-olefins having 3 or more carbon atoms Random, block, graft, etc. copolymers of the main part of the above with other unsaturated monomers. Among these polyolefins, ethylene or propylene homopolymers, ethylene and propylene copolymers, and ethylene or propylene and other α-olefin copolymers are preferable. Especially preferred is
It is a copolymer of propylene and ethylene having an ethylene content of 20% by weight or less, and such a copolymer is usually 0.1
~ 200g / 10min melt flow rate (MF
R, JIS K7210, load 2.16 kg, 230 ° C). As a polymer of ethylene, high-pressure process low-density polyethylene (LD
In addition to homopolymers such as PE) and low-pressure high-density polyethylene (HDPE), linear low-density polyethylene (LLDP)
E) and the like can also be used.

It is also possible to use a mixture of the above-mentioned polyolefin and an olefin elastomer up to about 40% by weight. Here, the olefin elastomer means two or more copolymer rubbers of α-olefins such as ethylene, propylene, butene-1, hexene-1, and 4-methyl-pentene-1, or α-olefins. And a monomer of another kind. Above α
Specific examples of the copolymer rubber of two or more kinds of olefins include ethylene-propylene copolymer rubber (E
PR) and ethylene-butene copolymer rubber (EBR)
And so on. A propylene random copolymer (PPDM) containing a non-conjugated diene comonomer represented by the following general formula (1) can also be used as the component (b).

[0008]

[Chemical 2]

[In the formula, R _{1 to} R ₄ are hydrogen atoms or alkyl groups having 1 to 6 carbon atoms, and m is an integer of 1 to 20. ]

Component (b) of the thermoplastic resin composition of the present invention
The modified polyolefin contained in an amount of 2% by weight or more is the above-mentioned various polyolefins modified with an unsaturated glycidyl compound. Here, examples of the unsaturated glycidyl compound used as the modifier include a glycidyl compound having an unsaturated group capable of copolymerizing with an olefin and a glycidyloxy group in the molecule, specifically, unsaturated glycidyl. In addition to esters and unsaturated glycidyl ethers, those having an acrylamide group and an epoxy group and represented by the following general formula (2) are preferably used.

[0011]

[Chemical 3]

[In the formula, R represents a hydrogen atom or a carbon number of 1 to 6]
Of Ar, Ar is an aromatic hydrocarbon group having 6 to 20 carbon atoms and having at least one glycidyloxy group, and n represents an integer of 1 to 4. Among the glycidyl compounds represented by the above general formula, a glycidyl compound represented by the following general formula (3) is particularly preferable.

[0013]

[Chemical 4]

[Wherein R represents a hydrogen atom or a carbon number of 1 to 6]
Is an alkyl group. Such a glycidyl compound can be produced, for example, by the method described in JP-A-60-130580, and these glycidyl compounds can be used alone or in combination of two or more kinds.

Examples of the raw material polyolefin modified with the above modifying agent include those exemplified as the above-mentioned component (b), and among these, polyethylene and polypropylene are particularly preferably used. As mentioned above, polypropylene includes PPDM in addition to ethylene as well as ethylene, but also copolymerized with other α-olefins such as butene and 4-methylpentene-1 up to about 40% by weight. LDPE, HDPE and LLD
PE is included.

The modified polyolefin preferred in the present invention is one obtained by modifying the above-mentioned raw material polyolefin, especially polyethylene or polypropylene, with a glycidyl compound represented by the general formula (2), particularly a glycidyl compound represented by the general formula (3). It is a thing. The content of the unsaturated glycidyl compound as a modifier for the modified polyolefin varies depending on the type of the raw material polyolefin and cannot be generally specified, but is generally about 0.1 to 15% by weight, preferably 0.2 to 10% by weight.

Such a modified polyolefin can be obtained by utilizing a known modification method such as a solution method or a melt-kneading method. In addition, a commercially available product may be appropriately selected and used. As a specific example of the modification method, a modification example of polypropylene with the glycidyl compound (graft polymerization)
Is shown below. That is, in the melt-kneading method, polypropylene and the above-mentioned glycidyl compound and, if necessary, a catalyst are used, and these components are put into an extruder, a twin-screw kneader, or the like and heated to a temperature of about 170 to 300 ° C. While melting, kneading is carried out for about 0.1 to 20 minutes to obtain a modified polypropylene. In the case of the solution method, the above-mentioned starting materials are dissolved in an organic solvent such as xylene, and modification is carried out while stirring at a temperature of about 90 to 200 ° C for 0.1 to 100 hours.

In any modification method, a conventional radical polymerization catalyst can be used as a catalyst, for example, benzoyl peroxide, lauroyl peroxide, ditertiary butyl peroxide, acetyl peroxide, tert-butyl peroxybenzoic acid. Peroxides such as acids, dicumyl peroxide, peroxybenzoic acid, peroxyacetic acid, tertiary butyl peroxypivalate, 2,5-dimethyl-2,5-ditertiary butyl peroxyhexyne, and azobisisobutyronitrile Diazo compounds and the like are used. The amount of the catalyst added is about 0.1 to 10 parts by weight with respect to 100 parts by weight of the glycidyl compound for modification. It is also possible to add a phenolic antioxidant during the above graft reaction.

The graft ratio of the modified polypropylene thus obtained is about 0.2 to 10% by weight and 1 to 1000 g /
Melt flow rate of about 10 minutes (MFR, JISK7210,
It has a load of 2.16 kg and 230 ° C.) and is preferably used in the present invention. Further, modification of other raw material polyolefin such as polyethylene can be carried out according to the above-mentioned method, and the graft ratio of the unsaturated glycidyl compound is 0.2 to 10% by weight.
Then, modified polyethylene having a melt flow rate (MFR, JIS K7210, load 2.16 kg, 230 ° C.) of about 0.1 to 1000 g / 10 minutes is also preferable.

In the present invention, in order to improve the compatibilization of the above components (a) and (b), (c) a styrenic thermoplastic elastomer modified with an unsaturated carboxylic acid or its derivative is blended. In (c) of the thermoplastic resin composition component of the present invention, the styrene-based thermoplastic elastomer, which is a raw material elastomer modified with an unsaturated carboxylic acid or a derivative thereof, is a styrene-based monomer and a styrene-based monomer. Obtain random, block with other monomers such as mono- or di-olefins,
It is a copolymer such as a graft and a hydrogenated product of these copolymers.

Here, as the styrene-based monomer, styrene, α-chlorostyrene, 2,4-dichlorostyrene, p-methoxystyrene, p-methylstyrene, p-
Phenylstyrene, p-divinylbenzene, p- (chloromethoxy) -styrene, α-methylstyrene, o-methyl-α-methylstyrene, m-methyl-α-methylstyrene, p-methyl-α-methylstyrene, p -Methoxy-α-methylstyrene and the like can be mentioned. Of these, styrene is preferably used. Examples of the diolefin include non-conjugated dienes such as dicyclopentadiene, 1,4-hexadiene, cyclooctadiene and methylnorbornene, or conjugated dienes such as butadiene and isoprene. Of these, butadiene and isoprene are preferred. Further, as the mono-olefin, in addition to ethylene, propylene, butene-1, hexene-1,
Examples thereof include α-olefins having 3 or more carbon atoms such as 3-methylbutene-1, 4-methyl-pentene-1, heptene-1, octene-1, and decene-1, and of these, ethylene and propylene are preferable.

The styrene-based thermoplastic elastomer used as the raw material elastomer of the modified styrene-based thermoplastic elastomer in the component (c) of the present invention is prepared by using the above-mentioned suitable monomer by a well-known suitable method such as anionic polymerization or radical polymerization. It can be obtained by copolymerization. Specific examples of preferable raw material elastomers include styrene-butadiene-styrene block copolymer (SBS) and its hydrogenated product styrene-ethylene-butylene-styrene block copolymer (SEBS).
Styrene-butadiene copolymer (SB) and hydrogenated product thereof, styrene-ethylene-butylene block copolymer (SEB), styrene-isoprene copolymer (SI) and hydrogenated product thereof, styrene-ethylene-propylene block copolymer Examples thereof include a polymer (SEP), a styrene-isoprene-styrene block copolymer (SIS), and a hydrogenated product thereof, a styrene-ethylene-propylene-styrene block copolymer (SEPS).
BS and SEPS are particularly preferred. The raw material elastomer preferably has a styrene-based monomer content of 5 to 80% by weight, particularly preferably 10 to 70% by weight. As such a preferable raw material styrene-based thermoplastic elastomer, a commercially available product can be appropriately selected and used.

In the component (c) of the present invention, examples of the unsaturated carboxylic acid or its derivative used as the modifier of the above-mentioned styrene-based thermoplastic elastomer include acrylic acid, methacrylic acid, maleic acid and endo-bicyclo [ 2.2.1] -5-Heptene-2,3-dicarboxylic acid (endic acid), fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid and other unsaturated mono- or dicarboxylic acids, Alternatively, derivatives thereof, such as acids, halides, amides, imides, anhydrides, esters and the like can be mentioned. Specific examples of the derivative include maleenyl chloride, maleimide, maleic anhydride, endic acid anhydride, methyl acrylate, methyl methacrylate, citraconic anhydride, monomethyl maleate, dimethyl maleate and the like. Among these, unsaturated dicarboxylic acids or their derivatives are preferable, and maleic acid and endic acid, or their anhydrides are particularly preferable. These modifiers may be used alone or in combination of two or more. The content of the unsaturated carboxylic acid or its derivative as the modifier is different depending on the type of the raw material elastomer and cannot be generally described, but it is generally 0.
It is about 1 to 15% by weight, preferably 0.1 to 10% by weight.

(C) of the thermoplastic resin composition component of the present invention
A modified styrene-based thermoplastic elastomer can be obtained by copolymerizing the above-mentioned raw material styrene-based thermoplastic elastomer and an unsaturated carboxylic acid or a derivative thereof using a known modification method such as a solution method or a melt-kneading method. ..
As a catalyst for this modification, for example, a catalyst for radical polymerization can be selected and used from those mentioned in the modification of the polyolefin. The modified styrenic thermoplastic elastomer preferred in the present invention is the above-mentioned raw material styrenic thermoplastic elastomer modified with maleic anhydride, and in particular SEBS is modified with maleic anhydride (MA
The graft ratio of maleic anhydride modified with H) is 0.1-1.
It is preferably 0% by weight. As such a preferable modified styrene-based thermoplastic elastomer, a commercially available product can be appropriately selected and used.

The mixing ratio of the above components (a), (b), and (c) is such that, in the component (b), the unmodified polyolefin and the modified polyolefin are in a weight ratio of 98/2 to 0.
/ 100, preferably 95/5 to 0/100. The present invention also includes compositions in which the total amount of component (b) is a modified polyolefin. That is, the composition comprising the polyester of the component (a), the modified polyolefin of the component (b), and the modified styrene-based thermoplastic elastomer of the component (c) is excellent in compatibility, and has the respective characteristics of the polyester and the polyolefin. It is also included and is included in the present invention. However, if the weight ratio of the unmodified polyolefin to the modified polyolefin in the component (b) is less than 98/2, the amount of the modified polyolefin is too small, and the effect of improving the compatibility between the polyester and the polyolefin due to the blending is not recognized.

The weight ratio of the component (a) (polyester) to the component (b) (that is, (a) / (b)).
2/98 to 98/2, preferably 5/95 to 95/5
Is. If the weight ratio is less than 2/98, the amount of polyester is too small, and if it exceeds 98/2, the amount of modified polyolefin is too small, and the effect of improving compatibility is not recognized.

Further, the component (c) is 2 to 40 parts by weight, preferably 5 parts by weight, relative to 100 parts by weight of the total amount of the components (a) and (b) (that is, (a) + (b)). ~ 30 parts by weight. If the amount is less than 2 parts by weight, the effect of improving the compatibility between the polyester and the polyolefin by the use of the modified styrene thermoplastic elastomer is not recognized, and if the amount is more than 40 parts by weight, the mechanical properties of the composition are adversely affected.

In the thermoplastic resin composition of the present invention, for the purpose of further strengthening and modifying it, fillers and reinforcing materials such as glass fibers, heat stabilizers, light stabilizers, flame retardants, plasticizers, antistatic agents. , A foaming agent, a nucleating agent and the like can be added.
The thermoplastic resin composition of the present invention is a uniaxial extruder, a biaxial extruder, a Banbury mixer, a kneading roll, each of the above components.
It can be obtained by heating and melting and kneading at 230 to 320 ° C., preferably 250 to 280 ° C. using a kneader such as Brabender. In the present invention, the kneading order of each component is not particularly limited, and the components (a), (b) and (c) may be kneaded together, or after kneading the components (a) and (b), The component (c) may be kneaded. Furthermore, the unmodified polyolefin and the modified polyolefin may be independently used as the component (b), the unmodified polyolefin and the component (a) may be kneaded, and then the modified polyolefin and the component (c) may be kneaded. The kneading order of can also be taken.

[0029]

The thermoplastic resin composition of the present invention comprises a polyester and a polyolefin, and a modified polyolefin and a modified styrene-based thermoplastic elastomer. The resin components of the polyester and the polyolefin are excellent. A thermoplastic resin composition that is compatible with each other and is excellent in impact resistance, heat resistance, mechanical strength, and insulation, and has no surface peeling. Although the reason why the thermoplastic resin composition of the present invention exerts such effects is not always clear, the interaction between the modified polyolefin of the component (b) and the modified styrene-based thermoplastic elastomer of the component (c), and the component It is considered that the polyester and the polyolefin are compatibilized through the interaction between the modified styrene-based thermoplastic elastomer of (c) and the polyester of component (a).

[0030]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. In each of the examples and comparative examples, the following materials were used as raw materials and additives. Polyester (1) Polyethylene terephthalate PET: [TR 4550BH manufactured by Teijin Limited, intrinsic viscosity [η]
0.70 (in o-chlorophenol)] (2) Polybutylene terephthalate PBT: [C-7000N manufactured by Teijin Ltd., intrinsic viscosity [η]
1.07 (in o-chlorophenol)] Polyolefin (1) Polypropylene homopolymer PP: [J209 manufactured by Tonen Kagaku KK, melt flow rate (MFR, 230 ° C, 2.16 kg load) 8.5 g / 10 min] (2) Polyethylene homo Polymer HDPE: [J6140V manufactured by Tonen Chemical Co., Ltd., melt flow rate (MFR, 190 ° C., 2.16 kg load) 5.0 g / 1
0 minutes] Modification monomer (1) MAH (maleic anhydride) (2) AXE: glycidyl compound represented by the following chemical formula (Kanefuchi Chemical Industry Co., Ltd.)

[0031]

[Chemical 5]

Radical generator POX: Perhexin 25B [made by NOF CORPORATION] Styrenic thermoplastic elastomer SEBS: [made by Asahi Kasei Corporation, Tuftec H-1041,
Styrene content 30% by weight] Modified styrene-based thermoplastic elastomer M-SEBS: [MAH (maleic anhydride) modified SEB
S, manufactured by Asahi Kasei Corporation, Tuftec M-1913, styrene content 30% by weight]

Modified Polyolefin (1) MAH Modified Polyolefin Polypropylene Homopolymer [Y20 manufactured by Tonen Kagaku Co., Ltd.
1. Melt flow rate (MFR, 230 ° C, 2.16 kg load) 1.0 g / 10 min] 100 parts by weight, MAH 1.0 parts by weight and POX 0.1 parts by weight were dry blended, and then this was uniaxially extruded with a diameter of 65 mm. Machine, 200 ℃, 10
Melt kneading at 0 rpm, melt flow rate (MF
R, 230 ° C., 2.16 kg load) 150 g / 10 min of modified polypropylene (PO-1) was obtained. The MAH graft ratio of this modified polypropylene was 0.25% by weight. The graft ratio was calculated by the following method. In the IR spectrum of the modified polypropylene (measured by dissolving the modified polypropylene in boiling xylene, removing the insoluble matter, precipitating the dissolved components with methanol, and pressing this to a thickness of about 50 μm), MAH Peak related to stretching and contraction of carbonyl (C = O) bond (1780c
The graft ratio was calculated from the ratio of the absorbance of m ⁻¹ ) to one of the peaks (840 cm ⁻¹ ) peculiar to isotactic polypropylene.

(2) AX-modified polyolefin polypropylene homopolymer [Y20 manufactured by Tonen Kagaku Co., Ltd.
1. Melt flow rate (MFR, 230 ° C., 2.16 kg load) 1.0 g / 10 min] 100 parts by weight, and AXE 3.0 parts by weight and POX 0.03 parts by weight after dry blending,
Using a uniaxial extruder having a diameter of 65 mm, this was heated at 200 ° C for 1
Melt kneading under the condition of 00 rpm, melt flow rate (M
FR, 230 ° C., 2.16 kg load) 30.0 g / 10 min of modified polypropylene (PO-2) was obtained. The AXE graft ratio of this modified polypropylene was 2.5% by weight. The graft ratio was based on the above-mentioned MAH except that the peak (1648 cm ^-1 ) related to the expansion and contraction of C = O bond of AXE was used as a reference.
It was determined in the same manner as in. (3) AX modified polyolefin polyethylene homopolymer [HDPE, Tonen Chemical Co., Ltd. J6311, melt flow rate (MFR, 190 ° C,
2.16 kg load) 1.0 g / 10 minutes] 100 parts by weight, AXE
After 2.0 parts by weight and 0.1 parts by weight of POX were dry blended, the resulting mixture was blended with 200 mm by using a single screw extruder having a diameter of 65 mm.
Melt-kneading was carried out under the conditions of .degree. C. and 100 rpm to obtain modified polyethylene (PO-3) having a melt flow rate (MFR, 190.degree. C., 2.16 kg load) of 0.7 g / 10 min. The AXE graft ratio of this modified polyethylene was 1.7% by weight.

Examples 1 to 29 and Comparative Examples 1 to 21 Polyester (PET or PBT), polyolefin (PP or HDPE), MAH modified polyolefin (PO-1) and AXE modified polyolefin (PO-
2 or PO-3), an unmodified styrene-based thermoplastic elastomer (SEBS), and a MAH-modified styrene-based thermoplastic elastomer (M-SEBS) were dry-blended with a Henschel mixer at a ratio shown in Table 1,
With a twin-screw extruder with a diameter of 45 mm (L / D = 30), 25
The mixture was kneaded at 0 ° C. and 200 rpm to obtain pellets of the resin composition. The thermoplastic resin composition thus obtained is injection-molded to obtain a melt flow rate (MFR, 250) of a molded product.
C., 2.16 kg load), surface peelability, flexural modulus at 23 ° C., Izod impact strength, elongation at break and yield strength, and heat distortion temperature. The results are also shown in Table 1.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

[Table 3]

[0039]

[Table 4]

[0040]

[Table 5]

[0041]

[Table 6]

[0042]

[Table 7]

The methods for measuring the physical properties shown in Table 1 above are as follows. (1) Melt flow rate: measured at 250 ° C. and a load of 2.16 kg. (2) Surface releasability: 100 squares of 1 mm × 1 mm were attached to the surface of the test piece using a razor, cellophane tape (manufactured by Nichiban Co., Ltd.) was attached to the squares, and then peeled off. Among 100 squares, the number of squares remaining on the surface of the test piece without adhering to the cellophane tape was counted. (3) Flexural modulus (23 ° C.): measured by ASTM D-790. (4) Izod impact strength (23 ° C): measured by ASTM D-256. (5) Elongation at break (23 ° C): measured by ASTM D-638. (6) Yield point strength (23 ° C): measured by ASTM D-638. (7) Heat distortion temperature (load 4.6 kg / cm ² ): Measured by ASTM D-648.

As is apparent from Table 1, a composition comprising polyester and unmodified polyolefin (Comparative Example 5)
7 to 12 and 17) are polyesters (Comparative Example 1,
2) and polyolefins (Comparative Examples 3 and 4),
It is found that the surface releasability, the flexural modulus, the Izod impact strength, the elongation at break, the yield strength and the heat deformation temperature are all inferior, and the compatibility between polyester and polyolefin is poor. Further, the compositions (Comparative Examples 8 to 11 and 18 to 21) in which MAH-modified polyolefin and / or unmodified styrene-based thermoplastic elastomer were blended with polyester and unmodified polyolefin were slightly improved in surface releasability. Although seen, other physical properties are still insufficient. On the other hand, the thermoplastic resin composition of the present invention is a composition comprising a polyester lacking an AXE-modified polyolefin and a MAH-modified styrene-based thermoplastic elastomer and an unmodified polyolefin (Comparative Example 5).
7 and 12 to 17), and polyester and unmodified polyolefin and MAH modified polyolefin and /
Alternatively, as compared with the composition composed of an unmodified styrene-based thermoplastic elastomer (Comparative Examples 8 to 11 and 18 to 21), surface peelability, flexural modulus, Izod impact strength,
The elongation at break, the strength at yield, and the heat distortion temperature are all favorable, and the elongation at break and the surface peeling property are remarkably improved.

[0045]

As described in detail above, the thermoplastic resin composition of the present invention comprises a polyolefin and a polyester which are mixed with a modified polyolefin for improving the compatibility of the polyolefin and the polyester, and a modified styrene-based thermoplastic elastomer. In addition to being excellent in impact resistance, heat resistance, mechanical strength and insulation, it has good surface properties such as surface peeling resistance. Such a thermoplastic resin composition of the present invention is suitable as various engineering plastics, particularly as a resin composition for interior and exterior parts of automobiles, home electric appliance parts, industrial material parts, packaging materials and the like.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Fujita 1-3-1 Nishitsurugaoka, Oi-cho, Iruma-gun, Saitama Tonen Research Institute

Claims (3)

[Claims] 1. A (a) polyester, (b) a polyolefin containing 2% by weight or more of a modified polyolefin modified with an unsaturated glycidyl compound, and (c) a styrenic heat modified with an unsaturated carboxylic acid or a derivative thereof. And a ratio of the components (a) and (b) in a weight ratio of (a) / (b) = 2/98 to 98/2.
And the content of the component (c) is (a) + (b) in total of 1
The thermoplastic resin composition is 2 to 40 parts by weight with respect to 00 parts by weight. 2. 2% by weight of component (b) according to claim 1.
The modified polyolefin contained above is represented by the following general formula: [In the formula, R represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, Ar represents an aromatic hydrocarbon group having 6 to 20 carbon atoms having at least one glycidyloxy group, and n
Represents an integer of 1 to 4. ] A polyolefin modified with an unsaturated glycidyl compound represented by the formula [1].
The thermoplastic resin composition according to. 3. A styrene thermoplastic elastomer modified with an unsaturated carboxylic acid or a derivative thereof is a styrene thermoplastic elastomer modified with an unsaturated dicarboxylic acid or an anhydride thereof and having a styrene content of 5 to 80% by weight. The thermoplastic resin composition according to claim 1 or 2.