JPS6032871A - Pressure-sensitive adhesive composition - Google Patents

Abstract

PURPOSE:The titled composition having long pot life, rapid curing during heating, and improved adhesion characteristics, comprising a polymer obtained by reacting a specific silicon compound with a polymer containing a functional group at the end of the molecule capable of reacting with a specific group of the silicon compound. CONSTITUTION:The desired composition comprising a polymer obtained by reacting a silicon compound shown by the formula [R<1> is (substituted) monofunctional organic group; X is hydrolyzable group (preferably alkoxy); Y is H, or monofunctional organic group (preferably H, epoxy, mercapto, or amino); n is 0, 1, 2] with a polymer [preferably copolymer of (meth)acrylic acid alkyl ester monomer (e.g., n-butyl acrylate, etc.) containing 4-14C alkyl group] containing a functional group at the end and/or side chain of the molecule capable of reacting Y group of the silicon compound. EFFECT:Having improved stability of tack after application with time, and no corrosion properties on the metal surface.

Description

[Detailed description of the invention] The present invention relates to novel pressure sensitive adhesive compositions.

More specifically, the present invention relates to a silane crosslinked curable composition, particularly a curable composition useful as a pressure sensitive adhesive.

Various cross-linking methods have been proposed as a way to increase the cohesive strength of pressure-sensitive adhesives, and among them, the most common is the urethane cross-linking method, which combines a polyisocyanate cross-linking agent with a polymer having carboxyl or hydroxyl groups. It is. However, in the case of the urethane crosslinking method, the polyisocyanate crosslinking agent is very sensitive to moisture, and the polyisocyanate crosslinking agent is highly sensitive to moisture, as well as active hydrogen groups such as carboxyl groups and hydroxyl groups present in the tackifying resin, and alcohol present in the solvent. Because of the reaction, there is a drawback that crosslinking between polymers, which is the intended purpose, is likely to be inhibited. In addition to the above-mentioned drawbacks, there is also the problem that post-treatments such as aging and water treatment are required after coating and drying on a substrate due to conflicts with curing speed, pot life, or adhesive properties.

The present inventors have conducted extensive research to solve the problems of the urethane crosslinking method as described above, and as a result, the terminal and/or side chain of the molecule has the general formula (1): % formula % (1) (formula (wherein, R1 is a substituted or unsubstituted monovalent organic group or a hydrolyzable group, Y is a hydrogen atom or a monovalent functional organic group, and n is 0.1 or 2). Polymer (B) having a functional group that can react with the Y group of A)
) was found to be able to be solved by using a pressure-sensitive adhesive composition containing the polymer (0) obtained by reacting the silicon compound (4) with the silicon compound (4), and the present invention was completed based on this discovery. I ended up doing it.

In other words, in the present invention, since a hydrolyzable silicon functional group is introduced into the terminal and/or side chain of the polymer (0) molecule, a sufficient pot life at room temperature and rapid curing characteristics when heated are changed. , and the hydrolyzable silicon functional group does not have the high reactivity with active hydrogen compounds found in isocyanates, so it is free from restrictions on the type and amount of tackifier resin, and can provide tackifying properties with a wide range of tackifying properties. It becomes possible to adjust the resin composition. Further, even if the composition of the present invention contains a solvent having an active hydrogen group such as alcohol, it has the advantage that there is no fear that the adhesive properties will be impaired.

The silicon compound represented by the general formula (1) used in the present invention (
A) is used in the production of the polymer (0) used in the present invention by reacting with the polymer (B) or by using it together with the monomer used in the production of the polymer (B). In general formula (1), and an alkoxy group such as ethoxy group are particularly preferred from the viewpoint of ease of handling. The Y group in general formula (1) includes an epoxy group,
(meth)acrylic group, amino group, hydroxy group, organic group having mercapto group, vinyl group, alkenyl group,
Examples include a hydrogen atom, and organic groups having an epoxy group, a mercapto group, a (meth)acrylate group, an amino group, a hydroxyl group, or a hydrogen atom are particularly preferred from the viewpoint of ease of handling. R1 in the general formula (1) is a substituted or unsubstituted monovalent organic group, and is preferably a monovalent hydrocarbon group having 1 to 12 carbon atoms selected from an alkyl group and an aryl group. Specific examples of the silicon compound (A) represented by the general formula (1) include γ-glycidoxybu p-pyltrimethoxysilane, γ-glycidoxybu is bilmethyldimethoxysilane, and β-(6,4-epoxycyclohexyl)ethyltrimethoxysilane. Silane, γ-mercapdobupyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxybutipyrtriethoxysilane, γ-aminopropyltriethoxysilane, γ-amitubylmethyldimethoxysilane, r ( 2-aminoethyl) pyrutrimethoxysilane, r-<2-aminoethyl)aminopropylmethyldimethoxysilane, γ-aminopropylmethyljethoxysilane, γ-hydroxypropyltrimethoxysilane, methyldimethoxyhydrosilane, trimethoxy Examples include hydrosilane and methyldimethoxyhydrosilane.

The polymer (B) used in the present invention may have a functional group that reacts with the Y group of the silicon compound (A) represented by the general formula (1) at the terminal and/or side chain within the molecule. Although not particularly limited, for example, a vinyl polymer having an unsaturated group such as a carboxyl group, a hydroxyl group, an incyanate group, an epoxy group, an amine group, a halogen group or a vinyl group or an allyl group at the terminal and/or side chain;
Polyether polyols such as polyoxypropylene glycol and polyoxytetramethylene glycol or their derivatives, liquid polybutadiene having a hydroxyl group or carboxyl group at the terminal and/or side chain,
Liquid polymers such as liquid polyisoprene, liquid butadiene-acrytetranitrile copolymer, liquid polypropylene, liquid hydrogenated polybutadiene, liquid polyisobutylene, or their derivatives, condensates of low molecular weight glyfur and dibasic acids Examples include polyester polyols such as ring-opening polymers of p-lactone and ε-cab p-lactone, and their derivatives. Among these, vinyl polymers, polyether polyols, liquid polymers, etc. are used as pressure-sensitive adhesives. It is particularly useful as a polymer.

Among the vinyl polymers, acrylic polymers are preferred, and among the acrylic polymers, the main component is a (meth)acrylic acid alkyl ester monomer in which the alkyl group has 4 to 14 carbon atoms. 50 during combination (B)
It can be easily mixed by a method such as copolymerizing a monomer copolymerized with a functional monomer having a functional group that can react with the Y group of the silicon compound (A). . As the main monomer of the polymer (B), the (meth)acrylic acid argyl ester in which the aralkyl group has 4 to 14 carbon atoms includes, for example, n-butyl (meth)acrylate, isobutyl (meth)acrylate, Examples include 2-methylpentyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and lauryl (meth)acrylate. If the number of carbon atoms in the alkyl group is less than 4 or more than 14, or if the proportion of the alkyl (meth)acrylic acid ester having 4 to 14 carbon atoms in the polymer (B) is less than 50 mol%. Otherwise, the polymer may become too hard, which is undesirable. Examples of monomers copolymerized with the (meth)acrylic acid alkyl ester include methyl (meth)acrylate, ethyl (meth)acrylate, ethylene, acryl tetranitrile,
Examples include hinyl ileate, isobutyl vinyl ether, styrene, acrylamide, N,N-dimethylaminoethyl acrylate, and the like.

Examples of the functional monomer having a functional group capable of reacting with the Y group of the silicon compound (A) contained in the polymer (E) include (meth)acrylic acid, itaconic acid, hydroxyethyl (meth)acrylate, anhydrous Specific examples include maleic acid, hydroxyprepyl (meth)acrylate-1% N-methylolacrylamide, glycidyl (meth)acrylate, and allyl (meth)acrylate.

A polymerization initiator or the like may be used in copolymerizing these monomers. Such polymerization initiators include azobisisobutyl, benzoyl peroxide, di-7-
In addition to common polymerization initiators such as butyl/<-oxide and lauroyl peroxide, other polymerization initiators such as bisazodicyanovaleric acid, azobiscyanopental, sulfur peroxide, 2,2-azobis(2-aminopropane) hydrochloride, etc. A compound having a functional group that can react with the organosilicon compound (A) may also be used.

When the monomers are polymerized, the molecular weight N may be determined by the polymerization initiator or by using a chain transfer agent. As the chain transfer agent, lauryl mercaptan,
In addition to commonly used substances such as dodecyl mercaptan and tetragenated compounds, silicon compounds such as 2-mercaptoethanol, 2-aminoethanethiol, 2-mercaptoacetic acid, 2-mercaptoacetic acid glycidyl ester, acetic acid trichloride, etc. Compounds having functional groups that can react with (A) can be used.

Compounds containing a hydrolyzable silicon functional group are also known as the polymerization initiators and chain transfer agents, and such compounds include initiators and H80H20H20H.
2Si(OOH3)3, possible. When using a polymerization initiator or chain transfer agent that contains such a reactive difunctional group or has a functional group that can react with the silicon compound (A),
Reactive silicon functional groups can be introduced at the ends of the resulting polymer molecules, which can lead to more favorable adhesive properties, especially when a polymer with a relatively low degree of polymerization is obtained.

As the solvent used in producing the polymer (B), known solvents such as benzene, toluene, xylene, hexane, cyclohexane, ethyl acetate, and methanol can be used alone or in combination of two or more. The amount of solvent used may be adjusted depending on the molecular weight of the desired polymer. The polymerization temperature depends on the type of polymerization initiator used, but is usually in the range of 50 to 150 °cJ. The molecular weight of the acrylic polymer obtained as described above is usually about 1,000 to 1,000,000. and can be used in the present invention. If the molecular weight of the polymer is 1,000 to several tens of thousands, it can be handled in a high solid state without a solvent or with a small amount of solvent added, but if the molecular weight is about 100,000 to 1,000,000, it can be handled in a solvent-based or high solid state. It is best to handle it in a water-dispersed state. Note that a tackifying resin may be added to the polymer as required.

On the other hand, the polyether polyols, which are one type of polymer (B) used in the present invention, are preferably linear, branched, or a mixture thereof, and have a molecular weight of about 1,000 to 60,000. The liquid polymers that are polymers preferably have a molecular weight of about 1,000 to 10,000. These polyether polyols and liquid polymers can be handled in a high solid state without a solvent or with a small amount of solvent added, and are usually used in combination with a tackifying resin.

The polymer (B) referred to in the present invention is (→ silicon compound (
(b) Those obtained by one-step polymerization so that they can be used as they are by reacting with the Y group of A), and (b) those obtained by pretreatment with a pretreatment agent having a functional group that can react with the Y group of silicon compound (A). treatment with a compound that has a functional group that can react with the Y group of the silicon compound (A), (Q) with a compound that can react with both (a) or (b) and the Y group of the silicon compound (A) This is a concept that also includes things that have been done.

Polymers obtained by using a pretreatment agent in this way are pretreated with polyisocyanates such as tolylene diisocyanate, hexamethylene diisocyanate, 4,4'-diphenylmethane diisocyanate, and the terminal and ( or prepolymers such as vinyl (acrylic), polyether, and liquid (liquid diene) having incyanate groups in their side chains, and acid halides such as (methaneacrylic acid chloride and (meth)acrylic acid bromide). Vinyl-based (
Examples include polymers such as acrylic type), polyether type, and liquid type (liquid diene type).

A silicon compound (
A) is reacted to produce a polymer having hydrolyzable silicon groups (
0), it is necessary to adjust the reaction conditions depending on the type of reaction between the two, but usually the copolymer (B
) is placed in a container, kept at room temperature or heated, and if necessary, using a reaction accelerator, the silicon compound (A) is added to the functional group of the polymer (B) in an amount of 0.1 to 1.2 By adding double the mole and stirring and mixing to complete the reaction, it can be easily dissolved.

Examples of the reaction between the functional groups in the polymer (B) and the functional groups in the silicon compound (A) include, but are not limited to, the following examples.

In the present invention, a tackifying resin may be added as necessary for the purpose of adjusting adhesive properties. Many known tackifier resins can be used, including rosin resin, modified rosin resin, rosin ester resin, terpene resin, terpene-phenol resin, and 7-element resin JI.
Examples include L petroleum resin, coumarone resin, and xylene resin. Further, fillers, softeners, ultraviolet absorbers, single-wavelength inhibitors, colorants, etc. may be added as necessary.

In the present invention, a curing catalyst can be used as necessary for the purpose of promoting curing. As a curing catalyst, titanate esters such as tetrabutyl titanate and tetrapropyl titanate; organotin compounds such as dibutyltin dilaurate, dibutyltin maleate, diptyltin diacetate, octylic acid, and naphthenic tin; lead octylate nibdelamine; Octylamine, dibutylamine, monoethanolamine, jetanolamine, triethanolamine, diethylenetriamine, triethylenetetramine, oleylamine, octylamine, cyclohexylamine, benzylamine, diethylamitube tetraviramine, xylylenediamine, triethylenediamine, guanidine, diphenylguanidine, 2,4.6-)lis(dimethylaminomethyl)phenol, morpholine, N
-Methylmorpholine, 1,6-diazapisic t-(5,
4,6) Amine compounds such as undecene-7 (DBU) or their salts such as carboxylic acids; low molecular weight polyamide resin obtained from excess polyamine and polybasic acid;
A reaction product of an excess polyamine and an epoxy compound; a silane coupling agent having an amino group, such as a known silanol condensation catalyst such as γ-amino/propyltrimethoxysilane or N-(β-aminoedyl)aminopropylmethyldimethoxysilane. One type or two or more types may be used as necessary. The pressure-sensitive adhesive composition of the present invention obtained in this way differs from conventional urethane crosslinked pressure-sensitive adhesives in that it has side chains and/or Since a hydrolyzable silicon group is introduced at the end, by using appropriate curing catalysts and additives as necessary, the pot life is long at room temperature and curing is fast when heated (in other words, aging It has the remarkable feature that not only is it unnecessary, but it also does not have problems such as the stability of the adhesive strength over time after adhesion or the corrosiveness of the metal surface.

The pressure-sensitive adhesive composition of the present invention can be applied to products such as pressure-sensitive adhesive tapes, sheets, and labels by applying it to paper, release paper, cloth, nonwoven fabric, plastic film, and metal foil and drying it. . Hereinafter, the composition of the present invention will be further explained with reference to specific examples. Note that the present invention is not limited only to the following examples.

Example 1 70 parts of butyl acrylate (parts by weight, the same applies hereinafter), 20 parts of 2-ethylhexyl acrylate, 8 parts of vinyl acetate, 2 parts of acrylic acid, 200 parts of toluene, and 2 s of benzoyl peroxide were placed in four Lof flasks, The mixture was stirred under a nitrogen atmosphere and polymerized at 75°C for 8 hours. After adding 0.1 part of hydroquinone to this to stop the polymerization, a mixed solution of 6.2 parts of γ-glycidoxybutetrabylmethyldimethoxysilane, 0.2 parts of benzyltrimethylammonium chloride, and 10 parts of methanol was added. The temperature was further raised to 0C and stirred for 22 hours to obtain an acrylic polymer into which silyl groups were introduced.

Dibutyltin oxide and dioctyl 7 are added to the resulting polymer.
Add 5 parts of the equimolar reaction product with tallate to a polyester film with a thickness of 25 μm, and the glue thickness after drying is 25 to 50 μm.
The adhesive tape was coated to give an adhesive tape and heated at 120°a for 3 minutes.

The obtained adhesive tape was attached to a stainless steel plate with a width of 2.5 cm, and the adhesive force was measured by peeling at 180° at 23° and 0.300 fractions/min. Also, glue the adhesive tape on the copper plate at 65°0. After curing for 7 days in an atmosphere with a humidity of 9 degrees and 80%, the presence or absence of corrosion on the copper surface was observed with the naked eye after the tape was peeled off, and the corrosion resistance of gold 14 was measured. The results are shown in Table 1.

After drying for 6 minutes with the adhesive tape ji120,
There was no need for so-called aging (curing for several hours or days at room temperature or at 50-60°C).

Approximately 30g of the obtained adhesive was placed in an open container (a 100co ethylene cup) and left to stand at 26°C while being stirred, and the condition was observed to ensure that the coating was uniformly applied to the film by the coater. The time until it stops
That is, the pot life was measured. The results are shown in Table 1.

Example 2 92 parts of 2-ethylhexyl acrylate, 5 parts of vinyl acetate, 15 ffls of glycidyl methacrylate, )/'ene 1
80 parts, methanol 20 parts and benzoyl peroxide 0.
Four 2 parts were placed in a flask, stirred under a nitrogen atmosphere, and polymerized at 75°0 for 8 hours. After adding 0.1 part of Hyde p-quinone to this to stop the polymerization, 2.4.6-
After adding 0.1 part of tris(dimethylaminomethyl)phenol and raising the temperature to 110°a, 3.8 parts of r-mercapdobutetravirmethyldimethoxysilane was gradually added dropwise over 2 hours, and the mixture was stirred for an additional 2 hours. An acrylic polymer into which silyl groups were introduced was obtained.

Using the obtained polymer, an adhesive tape was prepared in the same manner as in Example 1, and its adhesive strength and metal corrosion resistance were measured. In addition, the pot life was measured in the same manner as in Example 1. The results are shown in Table 1.

Example 6 93 parts of butyl acrylate, 5 parts of vinyl acetate, 2 parts of butylyl methacrylate, 180 parts of toluene, 20 parts of methanol,
a Put 0.2 parts of benzoyl oxide and 0.8 parts of dimercaptopropylmethyldimethoxysilane into a four-piece flask,
The mixture was stirred and polymerized at 75°0 for 6 hours under a nitrogen atmosphere. To this was added 0.0% of a 10% isopropanol solution of chloroplatinic acid.
1 part and 1.7 parts of methyldimethoxyhydridetetrasilane were added, the temperature was raised to 90°0, and the mixture was stirred and reacted for 4 hours to obtain an acrylic polymer into which a silyl group was introduced.

An adhesive tape was prepared using the obtained polymer in the same manner as in Example 1, and its adhesive strength and metal corrosion resistance were measured. In addition, the pot life was measured in the same manner as in Example 1. The results are shown in Table 1.

Example 4 90 parts of 2-ethylhexyl acrylate, 2-ethylhexyl acrylate
3 parts of hydroxyethyl, ff1E dipropylene, 10.2 parts of benzylic peroxide, and 200 parts of toluene were placed in a fourth flask, and the mixture was stirred at 75°a for 8 hours under a nitrogen atmosphere to polymerize. Meanwhile, put 4.5 parts of tolylene diisocyanate, 0.1 part of diptyltin dilaurate, and 50 parts of toluene into another well-dried 4-hole flask.
While heating and stirring at °CJ, 300 parts of the above polymer solution was added dropwise to obtain an acrylic copolymer having isocyanate groups. This was cooled to room temperature, 4.2 parts of γ-aminopropylmethyldimethoxysilane was gradually added dropwise, and the mixture was stirred at room temperature for 4 hours to obtain an acrylic copolymer into which silyl groups were introduced.

An adhesive tape was prepared using the obtained polymer in the same manner as in Example 1, and its adhesive strength and metal corrosion resistance were measured. In addition, the get life was measured in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 1 To 600 parts of the ataryl yarn polymer solution prepared in Example 1,
Without treatment with a silicon compound, o and s parts of polyisocyanate (Sumitomo Bayer Urethane (product name: Sumidur L) made by Shun) were added as a crosslinking agent to a polyester film with a thickness of 25 μm, and the adhesive thickness after drying was 25 to 5Q. 11m
After drying by heating at 120°C for 3 minutes, the adhesive tape was further left at room temperature for 3 days (aging) to obtain an adhesive tape.

Using the obtained adhesive tape, the adhesive strength and metal corrosion resistance were measured in the same manner as in Example 1. In addition, the pot life was measured in the same manner as in Example 1. The results are shown in Table 1.

Example 5 97 parts of butyl acrylate, 6 parts of acrylic acid, 3.5 parts of 2-mercaptoacetic acid, azobisisobutyronitrile o, s
m, put 10 parts of ethyl acetate into a fourth flask, heat to 70°0 under a nitrogen atmosphere, stir for 6 hours, and polymerize.
An acrylic polymer with carboxyl groups at the ends and side chains was obtained. To this was added a mixture of 9.3 parts of r-glycidoxybutyltrimethoxycitene, 0.2 parts of benzyltrimethylammonium chloride, and 10 parts of methanol.
After raising the temperature to 00QO, the mixture was stirred for 22 hours to obtain a low molecular weight acrylic polymer in which silyl groups were introduced into the terminals and side chains.

An adhesive tape was prepared using the obtained polymer in the same manner as in Example 1, and its adhesive strength and metal corrosion resistance were measured. In addition, potripe was measured in the same manner as in Example 1. The results are shown in Table 1.

Example 6 90 parts of 2-ethylhexyl acrylate, 2-ethylhexyl acrylate
4.8 parts of hydroxyethyl, 2-mercaptoethanol/
I/6.5 parts, azobiscyanopentanol 0.5 parts,
Four 10 parts of ethyl acetate were placed in a flask, and the mixture was gradually heated to 70°0 under a nitrogen atmosphere and stirred for 6 hours for polymerization. Meanwhile, in another well-dried 4-hole flask, add 7.2 parts of tolylene diisocyanate, octylic acid and
, os part, and 10 parts of ethyl acetate, and while heating to 8,000 ℃ and stirring, the entire amount of the above polymer was added dropwise to the end and/or f11! A low molecular weight acrylic polymer having isocyanate groups was obtained. After cooling this to room temperature, an additional 0.05 part of tin octylate was added, and 8.1 parts of γ-mercaptopropyltrimethoxysilane were gradually added dropwise, generating heat, but after about 2 hours the reaction was completed and the molecules An adhesive tape was prepared in the same manner as in Example 1 using the obtained low molecular weight acrylic polymer having a silyl group at the terminal and/or side chain, and the adhesive strength and metal corrosion resistance were evaluated. It was measured. In addition, the pot life was measured in the same manner as in Example 1. The results are shown in Table 1.

Example 7 Polyoxypropylene glycol 1 with a molecular weight of 3000
00 parts, 8.7 parts of tolylene diisocyanate and 0.04 parts of dibutyltin dilaure were added and mixed at 90% for 2 hours to obtain a prepolymer having a molecular weight of about 6000 and having isocyanate groups at both ends. To this was added 6.5 parts of γ-mercaptopropyltrimethoxysilane, and the mixture was further stirred for 4 hours to obtain a polymer having a silyl group at the end. A mixed solution of 80 parts of terpene phenol resin (softening point 100°0) and 40 parts of toluene was added to this to prepare a homogeneous solution.

Using the obtained solution, an adhesive tape was prepared in the same manner as in Example 1, and its adhesive strength and metal corrosivity were measured. In addition, the pot life was measured in the same manner as in Example 1. The results are shown in Table 1.

Example 8 Polyoxybu tetrapyrene diol 10 with a molecular weight of 3000
0 parts tolylene diisocyanate 2.9 parts, allyl isocyanate 2.8 parts, dibutyl saw dilaurate 0.05 parts
The mixture was mixed at 90°0 for 2 hours to create a polyamide with a molecular weight of approximately 6000, which was allylated at both ends. I got -. Add to this an inpropyl alcohol solution of chloroplatinic acid (10% concentration 3
0.05 part of methyldimethoxyhydrosilane and 7.1 parts of methyldimethoxyhydrosilane were added thereto, and the mixture was stirred at 90°0 for 4 hours to obtain polyoxypropylene with silylated terminals. To this, 100 parts of terpene phenol 11% fat (softening point 115J powder) was added, stirred well by hand, and then passed through a 6-paint four-wheel several times at room temperature to 60°0 to mix until uniformly dissolved. .

Using the obtained mixture, an adhesive tape was prepared in the same manner as in Example 1, and its adhesive strength and metal corrosivity were measured. In addition, the pot life was measured in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 2 5-0 parts of silylene diisocyanate as a crosslinking agent was added to 100 parts of the low molecular weight acrylic polymer having carboxyl groups at the terminals and side chains produced in Example 5 without treatment with a silicon compound, and a thickness of 25 μm was added. The adhesive tape was applied to a polyester film so that the adhesive thickness after drying was 25 to 50 ttm, dried by heating at 120° 0 for 6 minutes, and left at room temperature for 6 days to obtain an adhesive tape.

Using the resulting adhesive tape, the adhesive strength and metal corrosion properties were determined in the same manner as in Example 1. In addition, potripe was measured in the same manner as in Example 1. those results first
Shown in the table.

Claims (1)

[Claims] 1 At the terminal and/or side chain of the molecule, the general formula (1): % formula % (1) (wherein, R1 is a monovalent organic group substituted or unsubstituted, or hydrolyzed) A polymer (B
) with the silicon compound (A). 2 The polymer (B) has an alkyl group having 4 to 1 carbon atoms.
The composition according to claim 1, which is a polymer obtained by polymerizing the (meth)acrylic acid alkyl ester monomer represented by No. 4 as a main component. 6 In the silicon compound (A), X is an alkoxy group, and Y is a hydrogen atom or a monovalent organic group having a group selected from the group consisting of an epoxy group, a mercapto group, and an amine group. Composition according to item 1.