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US 6,649,700 B2Granted
Powder coating of epoxy-acrylic resin, polycarboxylic acid and crosslinked resin particles
AssigneeNippon Paint Co., Ltd.
InventorsMasami Yabuta, Yutaka Harada, Atsushi Yamada, Yasuhiko Nakae, Kazuhiko Nishimura, Haruhiko Sato
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Abstract
A thermosetting powder coating composition prepared by a wet process, which contains a mixture comprising (a) an epoxy-containing acrylic resin, (b) a polycarboxylic acid compound curing agent, (c) fine crosslinked resin particles and, optionally, (d) a resin that exists in the liquid form at room temperature.
Claims3
A thermosetting powder coating composition prepared by a wet process, said composition containing a mixture comprising:
- (a) an epoxy-containing acrylic resin comprising epoxy-containing acrylic resin A and epoxy-containing acrylic resin B, said resins A and B satisfying the properties:
- (1) (SPA-SPB) is within the range of from 0.2 to 1.5, wherein SPA is the solubility parameter of resin A and SPB is the solubility parameter of resin B;
- (2) Tg(A)-Tg(B)≧10° C., wherein Tg(A) is the glass transition temperature of resin A and Tg(B) is the glass transition temperature of resin B;
- (3) Tg(A) is within the range of from 40 to 100° C. and Tg(B) is within the range of from 20 to 50° C.;
- and
- (4) the weight ratio in solids of resin A to resin B is within the range of from 5:95 to 50:50;
- (b) a polycarboxylic acid compound curing agent;
- and
- (c) fine crosslinked resin particles.
6 more elements
Dependencies are inferred from the claim text.