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AssigneesDainippon Ink and Chemicals, Inc., Liquid Gas Co., Ltd.
InventorsTetsuro Agawa, Katsuhiko Okada, Hiroo Tanaka, Masaya Hashimoto, Takaaki Asakura
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A thermosetting powder coating composition has an average particle diameter of entire particles is within a range from 5 to 50 μm, an average circularity of the particles is 0.90 or more, and a circularity of particles having a maximum number frequency in circularity distribution is within a range from 0.98 to 1.00, prepared by spray-drying an organic solvent solution containing, as a coating film forming component, an epoxy group-containing vinyl copolymer (A) having a glass transition temperature of 40° C. or higher, an epoxy group-containing vinyl copolymer (B) having a glass transition temperature of 0° C. or lower and a polycarboxylic acid (C) as an essential component.
A thermosetting powder coating composition comprising, as a coating film forming component, particles containing an epoxy group-containing vinyl copolymer (A) having a glass transition temperature of 40° C. or higher, an epoxy group-containing vinyl copolymer (B) having a glass transition temperature of 0° C. or lower and a polycarboxylic acid (C), wherein an average particle diameter of entire particles is within a range from 5 to 50 μm, an average circularity of the particles is 0.90 or more, and a circularity of particles having a maximum number frequency in circularity distribution is within a range from 0.98 to 1.00.
A process for preparing a thermosetting powder coating composition, wherein an average particle diameter of entire particles is within a range from 5 to 50 μm, an average circularity of the particles is 0.90 or more, and a circularity of particles having a maximum number frequency in circularity distribution is within a range from 0.98 to 1.00, by spray-drying a raw powder coating composition solution comprising an epoxy group-containing vinyl copolymer (A) having a glass transition temperature of 40° C. or higher, an epoxy group-containing vinyl copolymer (B) having a glass transition temperature of 0° C. or lower and a polycarboxylic acid (C).
Dependencies are inferred from the claim text.