C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 163/00 (2006.01) C08G 59/18 (2006.01) C08J 3/28 (2006.01) C08J 7/04 (2006.01) C08K 5/19 (2006.01) C08L 63/00 (2006.01) C09D 5/03 (2006.01) C09D 7/12 (2006.01) C09D 163/06 (2006.01) C09D 167/00 (2006.01) C09D 175/04 (2006.01) C09D 201/08 (2006.01)
Patent
CA 2485629
Disclosed are epoxy-functional powder coating compositions which cure at low baking temperatures, a process for preparing such compositions, and their use for producing plastics. The powder coating compositions crosslink at low baking temperatures to give high-gloss or matt, light-stable and weather-stable coating films. The powder coating compositions comprise: A) at least one compound containing on average at least two epoxide groups and having a melting point of from 40 to 130°C and a number-average molar mass of below 5000 g/mol, B) at least one carboxyl-containing polymer having a melting point of from 40 to 130°C, an acid number of from 10 to 200 mg KOH/g, and a hydroxyl number of from 0 to 50 mg KOH/g, C) at least one catalyst selected from the group consisting of quaternary ammonium hydroxides, quaternary ammonium fluorides, and quaternary ammonium carboxylates, and D) optionally, at least one auxiliary additive, where the two components A) and B) are present in a ratio such that for each carboxyl group of component B) there are from 0.5 to 1.3 epoxide groups of component A) and the catalyst under C) contained in an amount of from 0.001 to 3% by weight of the total amount of the powder coating composition.
Spyrou Emmanouil
Wenning Andreas
Degussa Ag
Fetherstonhaugh & Co.
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