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Low-temperature cureable coating composition and article having cured coating thereof

A curing and composition technology, applied in the direction of coating, etc., can solve the problems of isocyanate instability, poor adhesion, skin irritation, etc., achieve good adhesion, maintain alkali resistance, and eliminate hazards

Inactive Publication Date: 2014-11-12
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the former has disadvantages: isocyanates are unstable and difficult to handle, e.g. skin irritation
Undesirably, coatings of these copolymers tend to have low hardness and have poor adhesion as evidenced by cohesive failure in adhesion testing

Method used

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  • Low-temperature cureable coating composition and article having cured coating thereof
  • Low-temperature cureable coating composition and article having cured coating thereof
  • Low-temperature cureable coating composition and article having cured coating thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Providing methyl methacrylate as the alkyl (meth)acrylate (a1) and 8-methacryloxyoctyltrimethoxysilane as the silane compound having a hydrolyzable functional group and a radically polymerizable unsaturated group (a2). They were dissolved in methyl isobutyl ketone at a molar ratio a1 / a2 of 50 / 50 to form a monomer mixed solution. A solution of 2,2'-azobis(2-methylbutyronitrile) in methyl isobutyl ketone was added dropwise to the monomer mixed solution at 90°C. The reaction solution was aged at 90°C for 2 hours and then passed through a mesh filter. The corresponding hydrolyzable silyl group-containing (meth)acrylic copolymer was obtained as a solution in methyl isobutyl ketone with a non-volatile content of 25%.

[0101] Next, 100 parts by weight of a hydrolyzable silyl-containing (meth)acrylic copolymer (corresponding to the solid or non-volatile content of the copolymer solution) and 5 parts by weight of tetrabutyl orthotitanate as an organometallic catalyst were mix...

Embodiment 2

[0103] Except for using di-n-butoxy(ethyl acetoacetate)aluminum as the organometallic catalyst, the same procedure as in Example 1 (including the mixing ratio and base material) was repeated. Coatings were similarly evaluated.

Embodiment 3

[0105] Except for using 11-methacryloyloxyundecyltrimethoxysilane as the silane compound (a2), the same procedure as in Example 1 (including the mixing ratio and base material) was repeated. Coatings were similarly evaluated.

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PUM

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Abstract

A coating composition comprising a hydrolysable silyl-containing (meth)acrylic copolymer which is obtained from copolymerization of an alkyl (meth)acrylate with a silane compound having a long-chain alkylene linker between a hydrolysable functional group and a radically polymerizable unsaturated group, and an organometallic catalyst is low-temperature curable and isocyanate-free. Even though the silane content is increased for coating hardness, the composition maintains alkali resistance and has good adhesion and solvent resistance when applied onto substrates.

Description

technical field [0001] The present invention relates to a low-temperature curable coating composition, which includes: (A) a hydrolyzable silyl group-containing (meth)acrylic copolymer, which is composed of (meth)acrylic acid alkyl ester and a hydrolyzable functional group and free radical polymerizability Copolymerization of silane compounds with unsaturated groups results in, and (B) an organometallic catalyst. It also relates to articles having a cured coating of the composition. Background technique [0002] From the standpoint of energy saving and efficient coating steps, there is a need for low temperature curable and highly chemical resistant coating compositions. Among them, a composition including a modified acrylic resin and a crosslinking agent is commonly used because of ease of resin production, weather resistance, chemical resistance, and coating strength. Specifically, there are known compositions comprising a hydroxyalkyl group-containing acrylic resin and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/12C09D143/04C09D7/12
CPCC08F30/08C09D133/14C08L2312/08C09D143/04C08F230/085C09D133/04C08F220/12
Inventor 山田哲郎吉川裕司土田和弘广神宗直
Owner SHIN ETSU CHEM CO LTD
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