Kyoeisha Chemical Co., Ltd.

Kosuke Asada

Yuya Moriwaki

Masaru Donkai

Naomi Takenaka

An object of the present invention is to provide a method for forming a multilayer coating film with excellent performance such as acid resistance, by using a coating composition which is completely different from conventional clear coating compositions and cheaper than conventional non-melamine curing type, acid/epoxy type, and isocyanate type clear coating compositions. A method for forming a multilayer coating film comprising a step (1) of applying a base coating composition and a step (2) of applying a clear coating composition on a coating film formed in the step (1), wherein the clear coating composition causes a curing reaction through a transesterification reaction between a hydroxyl group and an alkyl ester group.

Method for forming a multilayer coating film and multilayer coating film

It is an object of the present invention to provide an unsaturated group-containing ester compound which can be used as a raw material of a curable composition using transesterification reaction and which is inexpensive and has a good curability, and a polymer, a thermosetting resin composition, and a curable composition which containing the unsaturated group-containing ester compound, respectively. An unsaturated group-containing ester compound having a chemical structure represented by the following general formula (1):  n: 1 to 10 (in the formula, R, R, and Rare the same or different and each is a hydrogen, an alkyl group, a carboxyl group, an alkyl ester group or a structure represented by R-[COOR]n; Ris an aliphatic, an alicyclic or an aromatic alkylene group with a number of atoms of 50 or less in the main chain, which may have one or more functional groups selected from the group consisting of an ester group, an ether group, an amide group, and a urethane and may have a side chain; Ris an alkyl group having 50 or less carbon atoms; and in the compound represented by the general formula (1), the R-[COOR] group may be a lactone structure represented by the following general formula (1-1).  (Ris a hydrocarbon group having 2 to 10 carbon atoms which may have a branched chain.

Unsaturated group-containing ester compound, polymer, thermosetting resin composition, and cured film

A thermosetting resin composition using a transesterification reaction as a curing reaction, which has a good curability and can be used in various applications. A thermosetting resin composition comprising a polymer (A) composed of a monomer having a (meth) acrylic acid tertiary alkyl ester and a monomer having a hydroxyl group as a structural unit, and a transesterification catalyst (B) as an essential component, and being organic solvent-type or water-borne, wherein the polymer (A) has a glass transition temperature of 80&#xb0; C. or lower.

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Nara, Japan

Kosuke Asada