Dainippon Ink and Chemicals, Incorporated

Hidehisa Nakamura

Akio Shoji

Nobuo Harui

Yoichi Murakami

Noboru Ishikawa

Minoru Homma

Emiko Isomoto

Akifumi Yamamoto

Kazuyoshi Maruyama

Ryoichi Hori

Curable resin composition for use in water-based coating materials

PCT No. PCT/JP78/00013 Sec. 371 Date June 28, 1979 Sec. 102(e) Date June 19, 1979 PCT Filed Oct. 26, 1978 PCT Pub. No. W079/00240 PCT Pub. Date May 3, 1979 It has previously been known that the poor pigment dispersibility of an acrylic paint is its defect. The present invention provides a modified acrylic copolymer having superior pigment dispersibility and being suitable as a vehicle for acrylic paints. The copolymer is obtained by polymerizing specified proportions of a polyester containing an unsaturated double bond, a dialkylaminoalkyl (meth)acrylate, methyl methacrylate and another polymerizable monomer, and has a weight average molecular weight/number average molecular weight ratio within the range of 3 to 20.

Modified acrylic copolymer and coating composition comprising such

A thermosetting resin composition for powder paints, which comprises I. a polymer having a softening point, as measured by a ring-and-ball method, of 80.degree. to 150.degree. C. and a number average molecular weight of 3,000 to 15,000 and derived from (1) 10 to 40% by weight of .beta.-methylglycidyl (meth)acrylate or a mixture of it with glycidyl (meth)acrylate, (2) 20 to 80% by weight of styrene, (3) 3 to 40% by weight of a dialkyl ester of an aliphatic unsaturated dibasic acid and (4) 0 to 30% by weight of an alkyl (meth)acrylate, and Ii. an aliphatic saturated dibasic acid.

Thermosetting resin composition for powder paint comprising of a (I)

A powder coating resin composition comprising (A) 10 to 90% by weight of a glycidyl- or methyl glycidyl-containing copolymer and (B) 90 to 10% by weight of a polycarboxylic compound, said copolymer (A) being prepared by polymerizing (1) 5 to 40% by weight of at least one ethylenically unsaturated monomer selected from the group consisting of glycidyl-containing ethylenically unsaturated monomers and methyl glycidyl-containing ethylenically unsaturated monomers and (2) 20 to 90% by weight of at least one other ethylenically unsaturated monomer in the presence of (3) 5 to 40% by weight of a polyester resin containing an ethylenically unsaturated bond and having an acid number of not more than 10 KOH mg/g and a hydroxyl number of 20 to 300 KOH mg/g, said polyester resin being derived from 0.1-10 equivalent percent of an ethylenically unsaturated polycarboxylic acid, 30 to 49.9 equivalent percent of a polycarboxylic acid not containing an ethylenically unsaturated bond and 50 to 65 equivalent percent of a polyhydric alcohol.

Powder coating resin compositions of glycidyl copolymers having an

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Kishiwada, Japan

Hidehisa Nakamura