JPH11209701A - Primer composition and bonding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a saturated hydrocarbon-based material having a reactive silicon group, which has excellent adhesiveness on a substrate surface such as glass or metal or a joint surface with a pre-sealing material such as silicone rubber. To provide a primer composition and a bonding method applied to a sealing material mainly composed of a united material. (A) An organic titanate containing at least one silicon-containing group which has a hydroxyl group or a hydrolyzable group bonded to a silicon atom and can be crosslinked by forming a siloxane bond. A primer composition applied to a sealing material containing a saturated hydrocarbon-based polymer as a main component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primer composition containing an organic titanate and a bonding method, and more particularly to a siloxane bond having a hydroxyl group or a hydrolyzable group bonded to a silicon atom. A silicon-containing group capable of crosslinking by crosslinking (hereinafter referred to as a “reactive silicon group”).
That. The present invention relates to a primer composition and a bonding method which are effective in bonding a sealing material (for example, a sealing material disclosed in Japanese Patent Publication No. 4-69659) mainly containing a saturated hydrocarbon polymer having .

[0002]

2. Description of the Related Art In recent years, elastic sealing materials have been widely used for buildings, motor vehicles, and the like. The sealing material is a material that is used to fill joints and gaps between various members to provide watertightness and airtightness.
Accordingly, various base materials constituting joints and around the window frame, that is, inorganic materials such as glass, ceramics, metal, cement, and mortar, and organic materials such as plastics (hereinafter, these are collectively referred to as “base materials”). ) Must have good adhesion. However, the adhesiveness of the sealing material itself is still insufficient, and the use of a primer is indispensable in many cases.

[0003] Silicone-based, modified silicone-based, polysulfide-based and polyurethane-based sealants are well known as sealants applied to joints of the interior and exterior of general buildings. These sealing materials are used based on the concept of “the right place for the right material”, which uses the appropriate sealing material for each type of joint (including the type of base material). Is being developed.

It is not originally desirable to transfer different types of sealing materials to the above-mentioned various sealing materials. However, in the case of selection of sealing materials based on the idea of the right material in the right place or in the case of unavoidable connection of different types of sealing materials in factory construction, There is. Further, when repairing a sealing joint, an existing sealing material, that is, a precedent sealing material (hereinafter, referred to as a “base material” including a precedent sealing material in the present invention) is removed, and then a new sealing material (after the sealing material) is removed. However, the first sealing material cannot be completely removed, so that different types of sealing materials are unavoidably spliced. At this time, when the first sealing material is a silicone-based sealing material, there is a problem that the sealing cannot be performed with a sealing material other than the silicone-based sealing material.

On the other hand, a sealing material containing a saturated hydrocarbon polymer containing a reactive silicon group as a main component (particularly, an isobutylene-based sealing material having an isobutylene-based polymer as a main chain skeleton) has recently been developed. This isobutylene-based sealing material has characteristics such as dynamic followability, heat resistance, weather resistance, water resistance, excellent paintability, and does not contaminate the periphery of joints, and has the performance as a universal sealing material. No primer for isobutylene sealant has been developed.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a primer composition for satisfactorily bonding a sealing material mainly composed of a saturated hydrocarbon polymer having a reactive silicon group to various substrates. In particular, it is an object of the present invention to provide a primer composition and a bonding method having good adhesiveness when an isobutylene-based sealing material (post-cast) is connected to a silicone-based sealing material (first-shot).

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve such problems, and as a result, it has been found that a primer composition containing organic titanates can achieve the object. And completed the present invention. That is, the present invention provides (A) a silicon-containing group which contains a hydroxyl group or a hydrolyzable group bonded to a silicon atom and which can be crosslinked by forming a siloxane bond, which comprises an organic titanate. At least one
The present invention relates to a primer composition applied to a sealing material containing a saturated hydrocarbon-based polymer as a main component, and particularly to (B) a silicon atom with respect to (A) 100 parts by weight of an organic titanate. A saturated hydrocarbon polymer having at least one silicon-containing group capable of crosslinking by forming a siloxane bond, having a bonded hydroxyl group or a hydrolyzable group, and containing 1 to 100,000 parts by weight of a saturated hydrocarbon polymer. Primer applied to a sealing material mainly containing a saturated hydrocarbon polymer having at least one silicon-containing group which has a hydroxyl group or a hydrolyzable group bonded to a silicon atom and can be crosslinked by forming a siloxane bond. Composition.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The organic titanate which is the component (A) of the present invention is a component which is a feature of the present invention, and mainly comprises a saturated hydrocarbon polymer having a reactive silicon group with various substrates such as glass, metal and mortar. It is a component that gives strong adhesiveness to a sealing material as a component. In particular, it has a function of remarkably improving the adhesiveness of the spliced surface to a silicone-based sealing material (first-time sealing material). Further, the organic titanates are a silanol that promotes the condensation reaction of the reactive silicon group of the saturated hydrocarbon polymer having a reactive silicon group as the component (B) or the silane coupling agent as the component (C). It is a component that also functions as a condensation catalyst.

[0009] Such organic titanates include:
Examples thereof include organic titanates, chelate compounds of titanium, chelate compounds of silicates of titanium, titanate coupling agents, and partially hydrolyzed condensates thereof. Specific examples of the organic titanates include tetraisopropyl titanate, tetranormal butyl titanate, butyl titanate dimer, tetrakis (2
-Ethylhexyl) titanate, tetrastearyl titanate, tetramethyl titanate, diethoxybis (acetylacetonato) titanium, diisopropylbis (acetylacetonato) titanium, diisopropoxybis (ethylacetoacetate) titanium, isopropoxy (2-ethyl-1, 3-hexanediolato) titanium, di (2-ethylhexoxy) bis (2-ethyl-1,3-hexanediolato) titanium, di-n-butoxybis (triethanolaminato) titanium, tetraacetylacetonate titanium, hydroxy Bis (lactato) titanium and their hydrolytic condensates can be mentioned. Further, as a specific example of a titanate-based coupling agent,

[0010]

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And the hydrolytic condensates thereof. Among the above-mentioned organic titanates, the compounds represented by the general formula (1), Ti (OR) ₄ (1) (wherein R is the same as in the previous period) have an effect of improving the adhesiveness. Higher is more preferable.

The above-mentioned organic titanates may be used alone or in combination of two or more.
The content of the organic titanates in the primer composition of the present invention is preferably 0.1% to 30%, and more preferably 1% to 10%.
Is more preferable, and 2% to 5% is particularly preferable.

The saturated hydrocarbon polymer having a reactive silicon group as the component (B) used in the present invention has good adhesion to various substrates such as glass and metal, and has weather resistance through glass and water resistance. Functions as a component for forming a film having excellent adhesiveness. That is, the adhesiveness and durability of the primer composition of the present specification are improved. The saturated hydrocarbon polymer having a reactive silicon group is a polymer substantially containing no carbon-carbon unsaturated bond other than an aromatic ring, and includes, for example, polyethylene, polypropylene, polyisobutylene, hydrogenated polybutadiene, and hydrogenated polybutadiene. Added polyisoprene and the like.

The reactive silicon group is represented by the general formula (2):

[0015]

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(Wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms,
To 20 aryl groups, aralkyl groups having 7 to 20 carbon atoms, or (R ') 3SiO- (R' is each independently a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms) And a triorganosiloxy group. X is each independently a hydroxyl group or a hydrolyzable group. Further, a is 0, 1, 2, or 3, b is 0, 1, or 2, and a and b do not become 0 at the same time. M is 0 or 1 to 1
Which is an integer of 19).

Examples of the hydrolyzable group include commonly used groups such as a hydrogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an aminooxy group, a mercapto group and an alkenyloxy group. Can be Among these, an alkoxy group, an amide group and an aminooxy group are preferred, but an alkoxy group is particularly preferred because of its mild hydrolyzability and easy handling.

A hydrolyzable group or a hydroxyl group can be bonded to one silicon atom in the range of 1 to 3 and (a + Σ
b) is preferably in the range of 1 to 5. When two or more hydrolyzable groups or hydroxyl groups are bonded to the reactive silicon group, they may be the same or different. The number of silicon atoms forming the reactive silicon group is one or more. In the case of silicon atoms linked by a siloxane bond or the like, the number is preferably 20 or less.

In particular, the general formula (3)

[0020]

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The reactive silicon group represented by the formula (wherein R2, X and a are the same as above) is preferred because it is easily available. The number of reactive silicon groups in one molecule of the saturated hydrocarbon-based polymer is one or more, preferably 1.1 to 5. If the number of reactive silicon groups contained in the molecule is less than one, the curability becomes insufficient and a good film may not be obtained.

The reactive silicon group may be present at the terminal or inside the molecular chain of the saturated hydrocarbon polymer, or may be present at both. In particular, when the reactive silicon group is at the molecular end, the effective network chain amount of the saturated hydrocarbon-based polymer component contained in the finally formed cured film increases, so that a high-strength film is easily obtained. It is preferable from the point of becoming.

These saturated hydrocarbon polymers having a reactive silicon group can be used alone or in combination of two or more. The polymer constituting the skeleton of the saturated hydrocarbon polymer having a reactive silicon group used in the present invention is mainly composed of (1) an olefinic compound having 1 to 6 carbon atoms such as ethylene, propylene, 1-butene, isobutylene and the like. It can be obtained by a method of polymerizing as a monomer, (2) homopolymerizing a diene compound such as butadiene, isoprene, or the like, or copolymerizing the above olefin compound and then hydrogenating. Isobutylene-based polymers and hydrogenated polybutadiene-based polymers are preferred because a functional group can be easily introduced into the terminal, the molecular weight can be easily controlled, and the number of terminal functional groups can be increased.

In the isobutylene-based polymer, all of the monomer units may be formed from isobutylene units,
The monomer unit having a copolymer with isobutylene is contained in the isobutylene-based polymer in an amount of preferably 50% or less (% by weight, the same applies hereinafter), more preferably 30% or less, particularly preferably 10% or less. Is also good. Examples of such monomer components include olefins having 4 to 12 carbon atoms, vinyl ethers, aromatic vinyl compounds, vinyl silanes, allyl silanes, and the like. Such copolymer components include, for example, 1-butene, 2-butene, 2-methyl-1-butene, 3-methyl-1-butene, pentene, 4-methyl-1-pentene, hexene,
Vinylcyclohexene, methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, styrene, α-methylstyrene, dimethylstyrene, monochlorostyrene, dichlorostyrene, β-pinene, indene, vinyltrichlorosilane, vinylmethyldichlorosilane, vinyldimethylchlorosilane, vinyldimethylmethoxysilane, vinyl Trimethylsilane, divinyldichlorosilane, divinyldimethoxysilane, divinyldimethylsilane, 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, trivinylmethylsilane, tetravinylsilane, allyltrichlorosilane, allylmethyldichlorosilane, Allyldimethylchlorosilane, allyldimethylmethoxysilane, allyltrimethylsilane,
Diallyldichlorosilane, diallyldimethoxysilane,
Diallyldimethylsilane, γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane and the like.

When vinylsilanes or allylsilanes are used as monomers copolymerizable with isobutylene, the content of silicon increases and the number of groups that can act as a silane coupling agent increases, and the resulting primer composition Is improved in adhesiveness. In the hydrogenated polybutadiene-based polymer and other saturated hydrocarbon-based polymers, as in the case of the isobutylene-based polymer, other monomer units are contained in addition to the main monomer unit. You may.

The saturated hydrocarbon polymer having a reactive silicon group used in the present invention includes a double bond after polymerization such as a polyene compound such as butadiene and isoprene as long as the object of the present invention is achieved. May be contained in a small amount, preferably 10% or less, more preferably 5% or less, and particularly preferably 1% or less. The number average molecular weight of the saturated hydrocarbon polymer, preferably the isobutylene polymer or the hydrogenated polybutadiene polymer is from 500 to 5
It is preferably about 000, especially 1,000
Those having a liquid or fluidity of about 20,000 or so are preferable from the viewpoint of easy handling.

Next, a method for producing a saturated hydrocarbon polymer having a reactive silicon group will be described. Among the isobutylene-based polymers having a reactive silicon group, an isobutylene-based polymer having a reactive silicon group at a molecular chain terminal is a polymerization method called an inifer method (a specific method using both an initiator and a chain transfer agent called inifer). (Cationic polymerization method using a compound), and can be produced using a terminal-functional isobutylene-based polymer, preferably an all-terminal-functional isobutylene-based polymer. For example, polyisobutylene having a terminal unsaturated group was obtained by a dehydrohalogenation reaction of this polymer or an unsaturated group introduction reaction into the polymer as described in JP-A-63-105005. Later, the general formula

[0028]

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(Wherein R1, R2, X, a and b are the same as those described above) (this compound has a hydrogen atom bonded to a group represented by the general formula (2)) Compound)), preferably a compound of the general formula

[0030]

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(Wherein R 2, X and a are the same as those described above) to form a reactive silicon group into a polymer by subjecting a hydrosilane compound represented by the following formula to an addition reaction called hydrosilylation reaction using a platinum catalyst. Is introduced. Examples of the hydrosilane compound include halogenated silanes such as trichlorosilane, methyldichlorosilane, dimethylchlorosilane, and phenyldichlorosilane; and trimethoxysilane, triethoxysilane, methyldiethoxysilane, methyldimethoxysilane, and phenyldimethoxysilane. Alkoxysilanes; acyloxysilanes such as methyldiacetoxysilane and phenyldiacetoxysilane; and ketoximesilanes such as bis (dimethylketoxime) methylsilane and bis (cyclohexylketoxime) methylsilane. However, the present invention is not limited to these. Of these, halogenated silanes and alkoxysilanes are particularly preferred.

Such a manufacturing method is described in, for example,
-69659, JP-B-7-108928, JP-A-251468, JP-A-64-22904, and JP-A-2539445. Further, the isobutylene-based polymer having a reactive silicon group in the molecular chain is produced by adding a vinylsilane or an allylsilane having a reactive silicon group to a monomer mainly composed of isobutylene and copolymerizing the monomer.

Further, in the polymerization for producing an isobutylene-based polymer having a reactive silicon group at a molecular chain terminal, a vinylsilane or allylsilane having a reactive silicon group other than the main component isobutylene monomer is copolymerized. After that, by introducing a reactive silicon group to the terminal, an isobutylene-based polymer having a reactive silicon group at the terminal and in the molecular chain is produced.

Examples of vinylsilanes and allylsilanes having a reactive silicon group include vinyltrichlorosilane, vinylmethyldichlorosilane, vinyldimethylchlorosilane, vinyldimethylmethoxysilane, divinyldichlorosilane, divinyldimethoxysilane, allyltrichlorosilane, and allylsilane. Examples include methyldichlorosilane, allyldimethylchlorosilane, allyldimethylmethoxysilane, diallyldichlorosilane, diallyldimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, and γ-methacryloyloxypropylmethyldimethoxysilane.

In the hydrogenated polybutadiene-based polymer, for example, first, a hydroxyl group of a hydroxy-terminated hydrogenated polybutadiene-based polymer is converted into an oxymetal group such as -ONa or -OK, and then the compound represented by the general formula (4): CH2 = CH -R3-Y (4) (where Y is a halogen atom such as a chlorine atom or an iodine atom, and R3 is -R4-, -R4-OCO- or -R4-
CO- (R4 is a divalent hydrocarbon group having 1 to 20 carbon atoms,
Alkylene group, cycloalkylene group, arylene group, and aralkylene group are preferable).
By reacting an organic halogen compound represented by -CH2-, -R "-C6H5-CH2- (R" is particularly preferably a divalent group selected from hydrocarbon groups having 1 to 10 carbon atoms); A hydrogenated polybutadiene polymer having an olefin group (hereinafter also referred to as a terminal olefin hydrogenated polybutadiene polymer) is produced.

A method for converting a terminal hydroxyl group of a terminally hydrogenated polybutadiene polymer into an oxymetal group is as follows.
Alkali metals such as Na and K; metal hydrides such as NaH; metal alkoxides such as NaOCH3;
A method of reacting with an alkali hydroxide such as OH and KOH is exemplified. In the above-mentioned method, a terminal olefin hydrogenated polybutadiene polymer having almost the same molecular weight as the terminal hydroxy hydrogenated polybutadiene polymer used as a starting material can be obtained. Before reacting the organic halogen compound of the formula (4), a polyvalent organic halogen compound containing two or more halogens in one molecule such as methylene chloride, bis (chloromethyl) benzene, bis (chloromethyl) ether, etc. When the reaction is carried out, the molecular weight can be increased, and thereafter, when reacted with the organic halogen compound represented by the general formula (4), a hydrogenated polybutadiene-based polymer having a higher molecular weight and having an olefin group at a terminal can be obtained. Can be.

Specific examples of the organic halogen compound represented by the general formula (4) include, for example, allyl chloride,
Allyl bromide, vinyl (chloromethyl) benzene,
Allyl (chloromethyl) benzene, allyl (bromomethyl) benzene, allyl (chloromethyl) ether, allyl (chloromethoxy) benzene, 1-butenyl (chloromethyl) ether, 1-hexenyl (chloromethoxy)
Examples include, but are not limited to, benzene and allyloxy (chloromethyl) benzene. Of these, allyl chloride is preferable because it is inexpensive and easily reacts.

The introduction of a reactive silicon group into the hydrogenated polybutadiene polymer at the terminal olefin is carried out by using a platinum catalyst as in the case of an isobutylene polymer having a reactive silicon group at the molecular chain end. It is produced by performing an addition reaction. As described above, when the saturated hydrocarbon polymer having a reactive silicon group does not substantially contain an unsaturated bond which is not an aromatic ring in the molecule, an organic polymer having an unsaturated bond or an oxyalkylene-based polymer may be used. Compared to a film formed from a conventional rubber-based polymer such as a polymer, the weather resistance is significantly improved. Also, since the polymer is a hydrocarbon polymer, it has good moisture barrier properties and water resistance,
It has excellent adhesion performance to various inorganic base materials such as glass and aluminum, and forms a film with high moisture barrier properties.

The reactive silicon group-containing saturated hydrocarbon polymer used in the present invention is used in an amount of 1 to 10 parts by weight per 100 parts (parts by weight, hereinafter the same) of the organic titanate ester (A).
Used in the range of 0000 parts. In particular, 10 to 1000
It is preferably used in the range of parts. The content of the saturated hydrocarbon polymer having a reactive silicon group in the primer composition of the present invention is preferably 1% or more, more preferably 3% or more, and particularly preferably 5% or more. In particular, when the primer composition of the present invention is used for a porous substrate such as mortar, it is necessary to increase the film thickness of the coating in order to prevent leaching of moisture from the porous substrate. The combined content is preferably 5% or more, more preferably 10% or more, and 2% or more.
0% or more is particularly preferred.

The above-mentioned saturated hydrocarbon polymer having a reactive silicon group has a high viscosity of itself and poor workability. Therefore, for the purpose of lowering the viscosity of the polymer and improving the handling, various plasticizers may be added to such an extent that the adhesion and the contamination of the primer are not deteriorated. Examples of the plasticizer having good compatibility with the saturated hydrocarbon polymer as the component (B) of the present invention include polybutene, hydrogenated polybutene, and hydrogenated α-.
Polyvinyl oligomers such as olefin oligomers and atactic polypropylene; aromatic oligomers such as biphenyl and triphenyl; hydrogenated polyene oligomers such as hydrogenated liquid polybutadiene; paraffin oligomers such as paraffin oil and chlorinated paraffin oil;
And cycloparaffinic oligomers such as naphthenic oil.

Further, a phthalate ester plasticizer, a non-aromatic dibasic ester ester plasticizer, a phosphate ester plasticizer, and the like do not lower the adhesiveness, weather resistance, heat resistance, etc. of the primer composition of the present invention. To the extent, it may be used in combination with the above-mentioned plasticizer. These may be used alone or in combination of two or more. When the plasticizer introduces a reactive silicon group into the saturated hydrocarbon polymer, the reaction temperature is adjusted,
It may be used in place of the solvent for the purpose of adjusting the viscosity of the reaction system.

The amount of the plasticizer is preferably 1 to 100 parts, more preferably 10 to 50 parts, per 100 parts of the reactive silicon group-containing saturated hydrocarbon polymer. If the amount of the plasticizer is below this range, the plasticizing effect is small, and
If it exceeds this range, sufficient adhesiveness may not be obtained. The silane coupling agent, which is the component (C) of the present invention, forms a tough film by reaction with the saturated hydrocarbon polymer having a reactive silicon group, which is the component (B), and forms a tough film. It is intended to improve the adhesive strength between various base materials such as mortar and a sealing material containing a saturated hydrocarbon polymer having a reactive silicon group as a main component. The silane coupling agent is a compound having a group containing a silicon atom to which a hydrolyzable group is bonded (hereinafter, referred to as a hydrolyzable silicon group) and a functional group other than the group. Examples of the hydrolyzable silicon group include those in which X in the group represented by the general formula (2) is a hydrolyzable group. Specifically, the groups already exemplified as the hydrolyzable group can be mentioned, but a methoxy group, an ethoxy group and the like are preferable from the viewpoint of the hydrolysis rate. The number of hydrolyzable groups is preferably 2 or more, particularly preferably 3 or more.

Examples of the functional group other than the hydrolyzable silicon group include primary, secondary, and tertiary amino groups, mercapto groups, epoxy groups, carboxyl groups, vinyl groups, isocyanate groups, isocyanurates, and halogens. . Of these, primary, secondary, and tertiary amino groups, epoxy groups, isocyanate groups, isocyanurates, and the like are preferable, and isocyanate groups and amino groups are particularly preferable.

Specific examples of the silane coupling agent include:
γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- ( 2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltriethoxysilane, γ- (2-aminoethyl) aminopropylmethyldiethoxysilane,
Amino group-containing silanes such as γ-ureidopropyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-benzyl-γ-aminopropyltrimethoxysilane, N-vinylbenzyl-γ-aminopropyltriethoxysilane Silanes containing a mercapto group such as γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane; γ-glycidoxypropyltrimethoxy Silane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyl Epoxy group-containing silanes such as riethoxysilane; β-carboxyethyltriethoxysilane, β-carboxyethylphenylbis (2-methoxyethoxy) silane, N-β- (carboxymethyl) aminoethyl-γ-aminopropyltrimethoxy Carboxysilanes such as silanes; vinyl-type unsaturated group-containing silanes such as vinyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane, γ-acroyloxypropylmethyltriethoxysilane; γ-chloro Halogen-containing silanes such as propyltrimethoxysilane; isocyanurate silanes such as tris (trimethoxysilyl) isocyanurate; γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane;
γ-isocyanatopropylmethyldiethoxysilane,
Examples include isocyanate group-containing silanes such as γ-isocyanatopropylmethyldimethoxysilane. In addition, amino-modified silyl polymers, silylated amino polymers, unsaturated amino silane complexes, blocked isocyanate silanes, phenylamino long-chain alkyl silanes, amino silylated silicones, silylated polyesters, and the like, which are modified derivatives thereof, are also used as silane coupling agents. Can be used.

The silane coupling agent used in the present invention is:
It is used in the range of 1 to 10000 parts with respect to 100 parts of the organic titanate as the component (A). In particular, 10
It is preferred to use in the range of up to 1000 parts. The silane coupling agent may be used alone,
You may mix and use more than one kind. In the primer composition of the present invention, an adhesion-imparting agent other than the silane coupling agent can be used.

In the primer composition of the present invention,
As the component (D), a silanol condensation catalyst can be used as a component having a function of curing the primer composition of the present invention to give air drying properties. Examples of the silanol condensation catalyst include divalent and tetravalent tin-based curing catalysts, aluminum-based curing catalysts, and amine-based curing catalysts. Among these, a tetravalent tin-based curing catalyst is preferable because of its high catalytic activity. Tetravalent Examples of tin curing catalyst include tin carboxylates, dialkyl tin oxides, and the general formula _{(5), Q d Sn (} OZ) 4-d, or [Q ₂ Sn (OZ)] ₂ O (5) (wherein Q is a monovalent hydrocarbon group having 1 to 20 carbon atoms;
Is a monovalent hydrocarbon group having 1 to 20 carbon atoms or S
represents an organic group having a functional group capable of forming a coordination bond with n. Further, d is 0, 1, 2, or 3. And the like. Further, a tetravalent tin compound such as dialkyltin oxide or dialkyltin diacetate and a low molecular weight silicon compound having a hydrolyzable silicon group such as tetraethoxysilane, methyltriethoxysilane, diphenyldimethoxysilane, or phenyltrimethoxysilane The reactants are also effective as curing catalysts that significantly accelerate the silanol condensation reaction. Among these, the compound represented by the general formula (5), that is, a chelate compound such as dibutyltin bisacetylacetonate or a tin alcoholate has a high activity as a silanol condensation catalyst, and the film formation rate of the primer composition is increased. It is more preferable.

Specific examples of the tin carboxylate include:
For example, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin diethylhexanolate, dibutyltin dioctate, dibutyltin dimethyl malate, dibutyltin diethylmalate, dibutyltin dibutylmalate, dibutyltin diisooctylmalate, dibutyltin dibutyltin Examples include tridecyl malate, dibutyl tin dibenzyl malate, dibutyl tin maleate, dioctyl tin diacetate, dioctyl tin distearate, dioctyl tin dilaurate, dioctyl tin diethyl malate, dioctyl tin diisooctyl malate, and the like.

Specific examples of the dialkyltin oxides include dibutyltin oxide, dioctyltin oxide, and a mixture of dibutyltin oxide and phthalic acid ester. Specific examples of the chelate compound include:

[0049]

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However, the present invention is not limited to these. Of these, dibutyltin bisacetylacetonate is most preferred because of its high catalytic activity, low cost, and easy availability. Specific examples of the tin alcoholates include:

[0051]

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And the like, but are not limited thereto. Of these, dialkyltin dialkoxides are preferred. In particular, dibutyltin dimethoxide is
It is more preferable because of low cost and easy availability. Further, a silanol condensation catalyst other than the above-mentioned tetravalent tin-based curing catalyst may be used. Specifically, a divalent tin-based curing catalyst such as tin octylate; an aluminum-based curing catalyst such as aluminum trisacetylacetonate, aluminum trisethylacetoacetate, diisopropoxyaluminum ethylacetoacetate; zirconium tetraacetylacetonate; Lead octylate; butylamine, octylamine, laurylamine, dibutylamine, monoethanolamine, diethanolamine, triethanolamine, diethylenetriamine, triethylenetetramine, oleylamine, cyclohexylamine, benzylamine, diethylaminopropylamine,
Xylylenediamine, triethylenediamine, guanidine, diphenylguanidine, 2,4,6-tris (dimethylaminomethyl) phenol, morpholine, N-methylmorpholine, 2-ethyl-4-methylimidazole,
1,8-diazabicyclo (5,4,0) undecene-7
Amine-based curing catalysts such as (DBU) or salts of these amine-based compounds with carboxylic acids, etc .; low molecular weight polyamide resins obtained from excess polyamines and polybasic acids; reaction formation between excess polyamines and epoxy compounds Object; γ-
Silanol condensation catalysts such as silane coupling agents having an amino group such as aminopropyltrimethoxysilane and N- (β-aminoethyl) aminopropylmethyldimethoxysilane; and other known catalysts such as other acidic catalysts and basic catalysts. Examples thereof include a silanol condensation catalyst.

These catalysts may be used alone.
Two or more kinds may be used in combination. The compounding amount of the silanol condensation catalyst of the component (D) is preferably about 1 to 10000 parts, more preferably 10 to 1000 parts, per 100 parts of the organic titanate as the component (A). If the amount of the silanol curing catalyst is less than this range, the film formation rate may be slow, and the film may not be sufficiently formed. On the other hand, if the amount of the silanol curing catalyst exceeds this range, the open time becomes too short, which is not preferable from the viewpoint of workability.

In the present invention, a solvent can be used to adjust the viscosity of the primer composition to a value suitable for the primer coating operation. The solvent is the component (A) of the present invention.
Any type can be used as long as it can dissolve the component (D), and the type is not particularly limited. Specific examples of such a solvent include hydrocarbon solvents such as toluene, xylene, heptane, hexane, petroleum solvents, halogen solvents such as trichloroethylene, ester solvents such as ethyl acetate and butyl acetate, acetone, methyl ethyl ketone, and methyl isobutyl. Examples thereof include ketone solvents such as ketones, alcohol solvents such as methanol, ethanol and isopropanol, and silicone solvents such as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane. These solvents may be used alone or in combination of two or more.

The amount of the solvent is from 50 to 5000 based on 100 parts of the organic titanate as the component (A).
About 00 parts are preferable, and 500 to 5000 parts is more preferable. If the amount of the solvent is less than this range, the viscosity of the primer composition becomes too high, which is not preferable from the viewpoint of workability. If the amount of the solvent exceeds this range, sufficient adhesiveness may not be obtained.

In the primer composition of the present invention, various antioxidants are used as required. Such antioxidants include phenolic antioxidants, aromatic amine antioxidants, sulfur hydroperoxide decomposers, phosphorus hydroperoxide decomposers, benzotriazole UV absorbers, salicylate UV absorbers, benzophenone based Examples include an ultraviolet absorber, a hindered amine light stabilizer, and a nickel light stabilizer.

Specific examples of the phenolic antioxidants include 2,6-di-t-butylphenol, 2,4-di-t-butylphenol, and 2,6-di-t-butyl-4.
-Methylphenol, 2,5-di-t-butylhydroquinone, n-octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, pentaerythrityl-tetrakis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate],
2,2′-methylenebis (4-methyl-6-t-butylphenol), 4,4′-butylidenebis (3-methyl-6-t-butylphenol), 4,4′-thiobis (3-methyl-6-t -Butylphenol) and the like.

Specific examples of the aromatic amine antioxidant include N, N'-diphenyl-1p0-phenylenediamine, 6-ethoxy-2,2,4-trimethyl-1,
Examples thereof include 2-dihydroquinoline. Specific examples of the sulfur-based hydroperoxide decomposer include dilauryl-
3,3'-thiodipropionate, ditridecyl-3,
3'-thiodipropionate, distearyl-3,3
'-Thiodipropionate and the like.

Specific examples of the phosphorus hydroperoxide decomposer include diphenylisooctyl phosphite,
Examples include triphenyl phosphite. Specific examples of the benzotriazole-based ultraviolet absorber include 2-
(3,5-di-t-butyl-2-hydroxyphenyl)
-5-chlorobenzotriazole, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) Benzotriazole, 2-
(5-methyl-2-hydroxyphenyl) benzotriazole and the like can be exemplified.

Specific examples of the salicylate-based ultraviolet absorber include 4-t-butylphenyl salicylate,
Examples thereof include 4-di-t-butylphenyl-3,5′-di-t-butyl-4′-hydroxybenzoate. Specific examples of the benzophenone-based ultraviolet absorber,
2,4-dihydroxybenzophenone, 2-hydroxy-
4-methoxybenzophenone, 2-hydroxy-4-n-
Octoxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone and the like can be exemplified.

Specific examples of the hindered amine light stabilizer include bis (2,2,6,6-tetramethyl-4
-Piperidyl) sebacate, bis (1,2,2,6,
6, -pentamethyl-4-piperidyl) sebacate, 1
-{2- [3- (3,5-Di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl} -4-
[3- (3,5-Di-t-butyl-4-hydroxyphenyl) propionyloxy] -2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-2,2,
6,6, -tetramethylpiperidine and the like can be exemplified.

Specific examples of the nickel-based light stabilizer include nickel dibutyldithiocarbamate, [2,2
'-Thiobis (4-t-octylphenolate)]-2
-Ethylhexylamine nickel (II), [2.2
'-Thiobis (4-t-octylphenolate)]-n
-Butylamine nickel (II) and the like. These antioxidants may be used alone or in combination of two or more. It may work more effectively when used in combination than when used alone. Especially,
The combination of a phenolic antioxidant, a salicylate UV absorber and a hindered amine light stabilizer is (B)
It is more preferable to significantly improve the weather resistance of the saturated hydrocarbon polymer as a component.

The compounding amount of the antioxidant is 100 parts (A)
About 1 to 1000 parts per part, preferably 10 to 10 parts
0 parts is more preferred. If the amount is less than 1 part, the effect of improving the weather resistance may not be sufficient, and if it exceeds 100 parts, the cost and the adhesiveness of the primer composition deteriorate.
Further, in order to further improve the weather resistance, the primer composition of the present invention includes a weather resistance improving agent (a compound having an unsaturated group capable of polymerizing by reacting with oxygen in the air or a compound having an unsaturated group in the molecule). A polymerizable substance) is added as needed. These are effective when used alone, and may be used in combination.

The compound having an unsaturated group in the molecule which causes polymerization by reacting with oxygen in the air, that is, an oxidative polymerization reactive substance. Specific examples of the oxidative polymerization reactive substance include ester compounds of an unsaturated higher fatty acid and an alcohol, 1,2-polybutadiene, 1,4-polybutadiene, diene-based polymers and copolymers such as C5-C8 dienes, and further, Examples include various modified products of the polymer or copolymer (maleated modified products, boiled oil modified products, etc.).

Specific examples of the above ester compounds of unsaturated higher fatty acids include oleic acid, linoleic acid, linolenic acid, eleostearic acid, ricanic acid, ricinoleic acid,
Higher unsaturated fatty acids such as arachidonic acid, methanol,
Bound to a monohydric alcohol such as ethanol, a dihydric alcohol such as ethylene glycol or propylene glycol, a trihydric alcohol such as trimethylolpropane or glycerin, a tetrahydric alcohol such as pentaerythritol, a hexahydric alcohol such as sorbide, or a silicon atom. There is an ester compound obtained by a condensation reaction with an alcohol selected from an organic silicon compound having a hydroxyl group via an organic group.

Among these ester compounds, linseed oil, tung oil, soybean oil, and the like containing triglycerin ester, which is an ester of unsaturated higher fatty acid and glycerin, as a main component.
Asa seed oil, isano oil, urushi kernel oil, perilla oil, Eucommia oil, Kaya oil, walnut oil, poppy oil, cherry seed oil,
Drying oils such as pomegranate seed oil, safflower oil, tobacco seed oil, goose kernel oil, rubber seed oil, sunflower seed oil, grape kernel oil, balsam seed oil, and honeysuckle seed oil are inexpensive,
It is more preferable because it can be easily obtained.

Among the above-mentioned drying oils, tung oil, eucommia oil, pomegranate seed oil, mainly containing triglycerin ester of a conjugated unsaturated higher fatty acid such as eleostearic acid, ricanoic acid, punicic acid, canulpic acid, etc. Balsam seed oil and the like are more preferred because of their high weather resistance improving effect. The compound having an unsaturated group in the molecule which causes polymerization by reacting with oxygen in the air may be used alone or in combination of two or more.

The above-mentioned photopolymerizable substance is a compound having an unsaturated group that causes a polymerization reaction when a double bond in a molecule is activated by irradiation with light. Representative examples of the photopolymerizable unsaturated group contained in the photopolymerizable substance include a vinyl group, an allyl group, a vinyl ether group, a vinyl thioether group, a vinyl amino group, an acetylenically unsaturated group, an acryloyl group, a methacryloyl group, Styryl group, cinnamoyl group and the like,
Among these, an acryloyl group or a methacryloyl group is preferable because of its high photoinitiation efficiency.

Examples of the photopolymerizable substance having an acryloyl group or a methacryloyl group as a photosensitive group include acrylamide derivatives, methacrylamide derivatives, (meth) acrylates, and among them, (meth) acrylate However, it is more preferable because there are many types and it is easily available. In this specification, (meth) acrylate is a general term for acrylate and methacrylate.

Specific examples of the above (meth) acrylate include propylene having two functional groups (or butylene,
Ethylene) glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate having three functional groups, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate having four or more functional groups, dipentaerythritol Examples thereof include penta and hexa (meth) acrylate. Specific examples of the oligomer include a polyethylene glycol di (meth) acrylate and a polypropylene glycol di (meth) acrylate having a molecular weight of 10 or less.
000 or less oligoesters. 1
The number of acrylic or methacrylic unsaturated groups in the molecule is
Two or more are preferable, and three or more are more preferable. The effect of improving the weather resistance and adhesion of the unsaturated acrylic compound increases as the number of functional groups increases.

The photopolymerizable substance may be used alone,
Two or more kinds may be used in combination. The compounding amount of the weathering adhesion improving agent is preferably about 1 to 1000 parts, more preferably 10 to 100 parts, per 100 parts of the component (A). The amount is 1
If the amount is less than 1000 parts, the effect of improving the weather resistance may not be sufficient, and if the amount exceeds 1000 parts, the storage stability of the primer composition may decrease.

In the primer composition of the present invention, various fillers are used as needed. Specific examples of the filler include, for example, wood powder, pulp, cotton chips, asbestos, glass fiber, carbon fiber, mica, walnut husk powder, rice husk powder, graphite, diatomaceous earth, clay, fumed silica, precipitated silica , Silicic anhydride, carbon black, calcium carbonate, clay, talc, titanium oxide, magnesium carbonate, quartz, aluminum fine powder, flint powder,
Zinc powder and the like. Among these fillers, precipitated silica, fumed silica, carbon black, calcium carbonate, titanium oxide, talc and the like are preferable. These fillers may be used alone or in combination of two or more. When the filler is used, the amount is preferably 1 to 10000 parts, more preferably 10 to 1000 parts, per 100 parts of the component (A).
Parts are more preferred.

In addition to the components (A) to (D), the above-mentioned plasticizer, solvent, antioxidant, weathering adhesion improver and filler, the primer composition of the present invention may optionally contain Various additives are added. Examples of such additives include, for example, a physical property adjuster for adjusting the tensile properties of the resulting cured film, a storage stability improver, a radical inhibitor, a metal deactivator, an ozone deterioration inhibitor, and an anti-sagging agent. , Lubricant,
Pigments, foaming agents and the like.

Specific examples of such additives include, for example,
Japanese Patent Publication No. 4-69659, Japanese Patent Publication No. 7-1088928,
Patent Publication No. 251468, JP-A-64-22904
It is described in each specification of the issue. The primer composition of the present invention is effective when used as a sealing material containing a saturated hydrocarbon polymer having a reactive silicon group as a main component, and particularly contains an isobutylene polymer having a reactive silicon group as a main component. (For example, Japanese Patent Publication No. 4-69)
It is preferable when applied to an isobutylene-based sealing material disclosed in Japanese Patent No. 659) because of good adhesiveness.

The primer composition of the present invention comprises various metals such as iron, stainless steel, aluminum, nickel, zinc, and copper, acrylic resin, phenol resin, epoxy resin, polycarbonate resin, polybutylene terephthalate resin, and alkali-treated fluorine. Synthetic resin materials such as resin, inorganic materials such as glass, ceramic, cement, mortar, and modified silicone, silicone,
Sealing materials such as polyurethane, acrylic urethane, polysulfide, modified polysulfide, butyl rubber, acrylic, SBR, fluorine-containing, isobutylene, etc., and saturated hydrocarbon polymers having reactive silicon groups as main components Can be firmly bonded to the sealing material. In particular, the adhesiveness to silicone rubber such as a pre-cast silicone sealant, which has been considered difficult, can be significantly improved.

The primer composition of the present invention can be coated on a substrate by a commonly used coating method such as a brush coating method, a spray coating method, a wire bar method, a blade method, a roll coating method and a dipping method. The primer composition of the present invention can generally form a film at normal temperature, but the film may be formed under various temperature conditions in order to adjust the film formation speed.

[0077]

EXAMPLES Next, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

[0078]

[Production Example 1] A three-way cock was attached to a 2 L pressure-resistant glass container, and the inside of the container was replaced with nitrogen. Then, the container was dried by leaving it over one night with ethylcyclohexane (molecular sieves 3A) using a syringe. 138 ml) and 1012 ml of toluene (dried by leaving it together with Molecular Sieves 3A for one night or more), p-DCC (the following compound) 8.14
g (35.2 mmol) was added.

[0079]

Embedded image

Next, 254 ml of isobutylene monomer
(2.99 mol) of a pressure-resistant glass liquefaction sampling tube with a needle valve was connected to a three-way cock, and the polymerization vessel was cooled by placing it in a -70 ° C dry ice / ethanol bath, and then using a vacuum pump. To reduce the pressure inside the container. After opening the needle valve and introducing the isobutylene monomer from the liquefied gas collecting tube into the polymerization vessel, the inside of the vessel was returned to normal pressure by introducing nitrogen from one of the three-way cocks. Next, 0.387 g of 2-methylpyridine (4.
15 mmol) was added. Next, 4.90 titanium tetrachloride
The polymerization was initiated by adding 4 ml (44.7 mmol). After a reaction time of 70 minutes, 9.65 g of allyltrimethylsilane
(13.4 mmol) was added, and an allyl group was introduced into the polymer terminal. After a reaction time of 120 minutes, the reaction solution was washed four times with 200 ml of water, and then the solvent was distilled off to obtain an allyl-terminated isobutylene polymer.

Then, 200 g of the allyl-terminated isobutylene polymer thus obtained was mixed with 60 g of a paraffin-based process oil (manufactured by Idemitsu Kosan Co., Ltd., trade name: Diana Process PS-32) as a hydrocarbon plasticizer. 7
After the temperature was raised to 5 ° C, methyldimethoxysilane 1.5
[Eq / vinyl group], platinum (vinylsiloxane) complex 5x
10-5 [eq / vinyl group] was added, and a hydrosilylation reaction was performed. The reaction was tracked by FT-IR,
Over time the olefin absorption at 1640 cm-1 disappeared.

A desired mixture of isobutylene polymer having a reactive silicon group at both terminals (the following compound) and PS-32 as a plasticizer (weight ratio of 10/3) was obtained.

[0083]

Embedded image

The yield was calculated from the amount of the polymer thus obtained, and the Mn and Mw / Mn were determined by GPC method, and the terminal structure was determined by 300 MHz 1H-NMR analysis. : 6.5 to 7.5 ppm, methyl proton bonded to silicon atom derived from polymer end: 0.0 to 0.1 ppm
And methoxy protons: 3.4 to 3.5) were obtained by measuring and comparing the intensity of the resonance signals. 1H-NMR
Is a Varian Gemini 300 (300 MHz
for 1H) in CDCl3.

The FT-IR is IR-4 manufactured by Shimadzu Corporation.
08, GPC is Waters LC
Module 1, column is Shodex K-804
This was performed using Molecular weights are given as relative molecular weights to polystyrene standards. The analytical value of the polymer is
Mn = 5780, Mw / Mn = 1.28, Fn (silyl) = 1.93. (The number average molecular weight is in terms of polystyrene, the number of terminal silyl functional groups is isobutylene polymer 1
Number per molecule).

[0086]

Production Example 2 Ethylcyclohexane 262.5
ml, toluene 787.5 ml, isobutylene monomer 438 ml (5.15 mol), p-DCC 4.85 g
(21.0 mmol), 0.72 g of 2-methylpyridine
(7.7 mmol), allyltrimethylsilane 7.20
g (63.0 mmol), except that an allyl-terminated isobutylene polymer was synthesized in the same manner as in Production Example 1.

Next, 400 g of the allyl-terminated isobutylene polymer thus obtained was mixed with 200 g of a paraffin-based process oil (manufactured by Idemitsu Kosan Co., Ltd., trade name: Diana Process PS-32) as a hydrocarbon plasticizer. After the temperature was raised to 75 ° C., methyldimethoxysilane 2.4
[Eq / vinyl group], platinum (vinylsiloxane) complex7.
5 × 10 −5 [eq / vinyl group] was added to perform a hydrosilylation reaction. The reaction was followed by FT-IR, and the olefin absorption at 1640 cm-1 disappeared in about 20 hours.

The desired mixture (2/1 weight ratio) of isobutylene polymer having the reactive silicon groups at both ends (the following compound) and PS-32 as a plasticizer was obtained.
The analytical values of the polymer were Mn = 17600, Mw / Mn =
1.23, Fn (silyl) = 1.96.

[0089]

Examples 1-3 and Comparative Examples 1-3 Tetra-n-butyltitanate (Wako Pure Chemical Industries, Ltd.), which is an organic titanate of component (A), and Production Example 1 ( B) A mixture (weight ratio: PIB / PS-) of a saturated hydrocarbon polymer (PIB) having a reactive silicon group as a component and a paraffin-based process oil (trade name: Diana Process PS-32, manufactured by Idemitsu Kosan Co., Ltd.) 32 = 10/3),
N-phenyl-γ-aminopropyltrimethoxysilane (brand name KBM-573, manufactured by Shin-Etsu Chemical Co., Ltd.) or γ- (2-
Aminoethyl) aminopropylmethyldimethoxysilane (manufactured by Nippon Unicar Co., Ltd., trade name A-1120),
(D) Dibutyltin bisacetylacetonate (manufactured by Nitto Kasei Co., Ltd., trade name: Neostan U-220) as a silanol condensation catalyst of the component, and n-hexane (Wako Pure Chemical Industries, Ltd.) as a solvent. Mix at the weight ratio shown in 1,
A primer composition was prepared.

[0090]

[Table 1]

On the other hand, a main agent and a curing agent for an isobutylene-based sealing material were prepared by the following method, and an adhesion test was performed using this sealing material. Mixture of reactive hydrocarbon group-containing saturated hydrocarbon polymer (PIB) of component (A) obtained in Production Example 2 and paraffin-based process oil (Diana Process PS-32, trade name, manufactured by Idemitsu Kosan Co., Ltd.) (Weight ratio: PIB / PS-32 = 2/1) 150 parts, 60 parts of hydrogenated α-olefin oligomer (PAO5004, trade name, manufactured by Idemitsu Petrochemical Co., Ltd.), colloidal calcium carbonate (Maruo Calcium Co., Ltd.) ), 50 parts of trade name SEILLETS 200), 50 parts of colloidal calcium carbonate (manufactured by Maruo Calcium Co., Ltd., trade name: MC-5), heavy calcium carbonate (manufactured by Shiroishi Calcium Co., Ltd., trade name: Softon 320
0) 40 parts, epoxy resin (Yuika Shell Epoxy Co., Ltd.)
5 parts, photocurable resin (trade name ARONIX M-309, manufactured by Toagosei Co., Ltd.)
1 part of a hindered phenolic antioxidant (manufactured by Nippon Ciba Geigy Co., Ltd., trade name: Irganox 1010)
1 part of benzotriazole-based ultraviolet absorber (trade name: Tinuvin 327, manufactured by Nippon Ciba Geigy Co., Ltd.), hindered amine light stabilizer (trade name: Sanol LS-, manufactured by Sankyo Co., Ltd.)
770) 1 part and H2O5 part were weighed and mixed with each other, and kneaded three times with a small three paint roll to obtain a base material.

As curing agents, 3 parts of tin octylate (Neostan U-28, manufactured by Nitto Kasei Co., Ltd.), 0.75 part of laurylamine (Wako Pure Chemical Industries, Ltd.), paraffin-based process oil (Idemitsu) 6.25 parts of Diana Process PS-32 manufactured by Kosan Co., Ltd., heavy calcium carbonate (Softon 3200 manufactured by Shiraishi Calcium Co., Ltd.)
10 parts, 10 parts of titanium oxide (manufactured by Ishihara Sangyo Co., Ltd., trade name: Typaque R-820), and 10 parts of carbon black (manufactured by Mitsubishi Chemical Corporation, trade name: carbon black # 30) were measured and mixed. The composition was kneaded with a small homogenizer to obtain a curing agent.

The tensile adhesion test method was evaluated by the following method. Float glass conforming to JIS A-5758 (manufactured by Koensha: Designated by Japan Sealing Material Association, dimensions: 5
× 5 × 0.5 cm) was washed with methyl ethyl ketone (Wako Pure Chemical Industries, Ltd.), and the primer shown in Table 1 was applied once. Also, fully cured and cured dimensions: 4 x 3 x 1 cm
Size silicone sealant (Yokohama Rubber Co., Ltd.)
(Trade name: Silicone 70) was cut into two pieces (dimensions: 4 × 3 × 0.5 cm) with a cutter knife, and the cut surface was washed with toluene (Wako Pure Chemical Industries, Ltd.). The primer was applied once. On the primer layer formed by leaving the coating at 23 ° C. for 1 hour or more, the main agent and the curing agent of the above-mentioned isobutylene-based sealing material were combined with the main agent / curing agent = 100 /
A mixture weighed at a weight ratio of 10 and sufficiently kneaded was applied in a thickness of 5 mm and cured in an oven. The curing conditions are all 23 ° C. × 2 days + 50 ° C. × 4 days. After curing, a hand peel test was performed while cutting the adhesive surface with a cutter knife. The surface of the peeled substrate was observed, and the ratio of the cohesive failure portion was defined as the cohesive failure rate (%). Table 1 summarizes the composition of the primer and the measurement results of the adhesion test.

The primer compositions shown in Comparative Examples 1 to 3
The adhesion to float glass is poor, and the cohesive failure rate is 0% in all cases. In addition, the splicing property with respect to the silicone-based sealing material, which is a pre-filled sealing material, is poor, and all show interface failure. On the other hand, the primer compositions of Examples 1 to 3 containing the organic titanates as the component (A) have good adhesion to float glass,
It also shows cohesive failure with silicone sealants.

As described above, the primer composition containing (A) an organic titanate ester can be used to bond various substrates to a sealing material containing a saturated hydrocarbon polymer having a reactive silicon group as a main component. Properties, in particular, the adhesion at the joint interface between the silicone-based sealing material (first-time sealing material) and the isobutylene-based sealing material (post-sealing material).

[0096]

The primer composition of the present invention, when applied to a sealing material containing a saturated hydrocarbon polymer having a reactive silicon group as a main component, has an adhesive property to various substrates and a silicone sealing. The splicing property for the material can be significantly improved.

Claims (11)

[Claims] Claims: 1. A silicon-containing group having a hydroxyl group or a hydrolyzable group bonded to a silicon atom and capable of being crosslinked by forming a siloxane bond, which comprises an organic titanate (A). A primer composition applied to a sealing material containing at least one saturated hydrocarbon polymer as a main component. 2. A saturated hydrocarbon polymer having as component (B) a hydroxyl group or a hydrolyzable group bonded to a silicon atom and having at least one silicon-containing group capable of crosslinking by forming a siloxane bond. The primer composition according to claim 1, further comprising: 3. The primer composition according to claim 1, further comprising a silane coupling agent as the component (C). 4. The primer composition according to claim 1, further comprising a silanol condensation catalyst as the component (D). 5. The organic titanate of the component (A) is represented by the general formula (1), Ti (OR) ₄ (1)
Are each independently a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms.) The primer composition according to claim 1, wherein 6. The saturated hydrocarbon polymer as the component (B),
The number average molecular weight is in the range of 500 to 50,000, and at the terminal of the main chain and / or the terminal of the side chain, a compound represented by the general formula (2): (Wherein, R1 and R2 each independently represent a carbon atom of 1
To 20 alkyl groups, aryl groups having 6 to 20 carbon atoms, aralkyl groups having 7 to 20 carbon atoms, or (R ′) 3 SiO—
(R ′ is each independently a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms). X is each independently a hydroxyl group or a hydrolyzable group. Further, a is 0, 1,
B is 0, 1, or 2, and a and b do not become 0 at the same time. Also, m
The primer composition according to claim 2, wherein the primer composition has one or more hydrolyzable silyl groups represented by the following formula: 7. The saturated hydrocarbon polymer as the component (B),
The primer composition according to claim 2, which is a polymer having a total amount of repeating units derived from isobutylene of 50% by weight or more. 8. The silane coupling agent as the component (C),
4. A silane coupling agent containing an isocyanate group and / or a silane coupling agent containing an amino group.
The primer composition according to any one of the preceding claims. 9. Silicon containing (B) having a hydroxyl group or a hydrolyzable group bonded to a silicon atom and being crosslinkable by forming a siloxane bond with respect to 100 parts by weight of an organic titanate. The primer composition according to claim 2, comprising 1 to 100,000 parts by weight of a saturated hydrocarbon polymer having at least one group. 10. (A) Organic titanates,
A primer composition comprising (C) a silane coupling agent and (D) a silanol condensation catalyst. 11. A primer composition containing (A) an organic titanate ester is coated on a substrate, and a siloxane bond having a hydroxyl group or a hydrolyzable group bonded to a silicon atom is formed on the coated surface. A method for bonding a sealing material to a substrate, comprising bonding a sealing material containing a saturated hydrocarbon polymer having at least one silicon-containing group capable of being crosslinked by forming the sealing material as a main component.