Curable composition

A composition and curing technology, used in coatings, polyurea/polyurethane coatings, etc., can solve the problems of easy surface injury, low hardness, appearance damage, etc., and achieve excellent flexibility and curl resistance, high hardness, and easy handling. good effect

Active Publication Date: 2017-02-22
TOAGOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, plastic substrates are lightweight and have excellent impact resistance and easy formability, but the

Method used

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Examples

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Embodiment

[0230] Examples and comparative examples are shown below, and the present invention will be described more specifically. Furthermore, the present invention is not limited to these examples.

[0231] In addition, in the following, unless otherwise specified, "parts" means parts by weight, and "%" means % by weight.

manufacture example 1

[0233] 1) Raw material production example 1 [production of compound (a1)]

[0234] 301 parts (4.18 moles) of acrylic acid and pentaerythritol [manufactured by Guangei Chemical Co., Ltd.] were mixed in a 4-necked flask equipped with a thermometer, a stirrer, a water-cooled condenser, and a blowing port while blowing nitrogen gas containing 5% by volume of oxygen. Hereinafter referred to as "PE"] 167 parts (1.23 moles), sulfuric acid 7 parts, hydroquinone monomethyl ether (hereinafter referred to as "MEHQ") 0.14 parts and toluene 224 parts, at a reaction temperature of about 80°C and 370 Torr (absolute pressure) While removing condensation water, it was allowed to react until 45 mol% of all hydroxyl groups in PE were esterified.

[0235] The generated condensation water was 28 parts, and 42 parts of unreacted PE were recovered. 870 parts of toluene were added after completion|finish of reaction.

[0236] Under stirring, a 20% aqueous sodium hydroxide solution was added in an a...

manufacture example 2

[0238] 2) Raw material production example 2 [production of compound (a1)]

[0239] Except for using 301 parts of acrylic acid (4.18 mol), 167 parts of PE (1.23 mol), 7 parts of sulfuric acid, 0.14 parts of MEHQ, and 224 parts of toluene, it was reacted while removing condensation water under the same conditions as in Raw Material Production Example 1. Up to 30% of all hydroxyl groups in PET are esterified.

[0240] 18 parts of condensation water were produced, and 83.5 parts of unreacted PE were recovered. 870 parts of toluene were added after completion|finish of reaction.

[0241] By the same operation as in raw material production example 1, using the same amount of sodium hydroxide aqueous solution and water, neutralization treatment and water washing treatment were performed, and then toluene was distilled off.

[0242] The obtained acrylate was 120 parts, and the hydroxyl value was 224 mgKOH / g.

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Abstract

[Problem] The problem addressed by the present invention is to provide a curable composition having superior hardness, adhesion, and flexibility of a cured film thereof, having greater superiority in curl resistance, and superior storage stability such that clouding does not arise even after long-term storage. [Solution] The curable composition contains a urethane (meth)acrylate-containing reaction product (A) resulting from reacting: a compound (a1) that is the result of adding (meth)acrylic acid to pentaerythritol and that has a hydroxyl value of 180-300 mgKOH/g; and a polyvalent isocyanate compound (a2).

Description

technical field [0001] The invention relates to a curable composition containing urethane (meth)acrylate, and belongs to the technical field of active energy ray curable composition, paint and coating. Background technique [0002] Conventionally, a method of forming a protective film on a substrate using a coating composition has been utilized for the purpose of protecting the surface of the substrate or imparting beauty or design to various substrates such as metal, glass, and plastic. In particular, plastic substrates are lightweight and have excellent impact resistance and formability, but have the disadvantage of being easily scratched on the surface and having low hardness, and their appearance will be significantly damaged if they are used as they are. Therefore, it is necessary to coat the surface of the plastic substrate with a coating composition and perform a so-called hard coat treatment to impart scratch resistance and increase surface hardness. [0003] As a c...

Claims

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Application Information

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IPC IPC(8): C08F299/06C08F290/06C08G18/67C09D175/14
CPCC08G18/67C08F290/06C08F299/06C09D175/14C08G18/672
Inventor 佐内康之大田祐子
Owner TOAGOSEI CO LTD
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