Powder coating

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C - Chemistry, Metallurgy

08

K

402/192, 117/197

C08K 5/15 (2006.01) C08G 63/20 (2006.01) C09D 5/46 (2006.01) C09D 167/00 (2006.01)

Patent

CA 1203940

ABSTRACT The inveniton relates to a powder coating comprising a binding agent wherein the binding agent is a homogeneous mixture of between 1.9 and 9.0 wt.% of a diglycidyl phthalate and between 91.0 and 98.1 wt.% of a polyester containing carboxyl groups, wherein the polyester has an acid number between 10 and 30 mg KOH/g, a hydroxyl number of less than 15 mg KOH/g, a theoretical number-average molecular weight between 3,750 and 12,500 and a glass tran- sition temperature between 48 and 85°C. The coating layer of a substrate coated with the powder coating exhibits an excellent combination of glass, flow and mechanical properties as well as good heat stability. The coating is thus suitable for, inter alia, radiators, lighting fixtures and other ob- jects which are usually exposed to a prolonged heat load.

439945

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