C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/04 (2006.01) C08G 18/18 (2006.01) C08G 18/22 (2006.01) C08G 18/28 (2006.01) C08G 18/32 (2006.01) C08G 18/72 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01) C08J 7/04 (2006.01)
Patent
CA 2485627
Disclosed are polyurethane powder coating compositions based on epoxy-terminated polyaddition compounds containing uretdione groups, which cure at low baking temperatures, a process for preparing such compositions, and their use for producing plastics, especially polyurethane powder coatings, which 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 epoxy-terminated polyaddition compound containing uretdione groups which has a melting point of from 40 to 130°C, a number-average molar mass of between 1,000 and 15,000, and a free isocyanate group content (calculated as NCO, molecular weight = 42) of from 0 to 2% by weight; B) at least one hydroxyl-containing polymer having a melting point of from 40 to 130°C and an OH number of from 20 to 200 mg KOH/g; C) at least one catalyst selected from the group consisting of metal acetylacetonates, metal hydroxides, metal alkoxides, quaternary ammonium hydroxides, quaternary ammonium fluorides, and quaternary ammonium carboxylates; and D) optionally, at least one auxiliary or additive, wherein the components A) and B) are contained at such a ratio that for each hydroxyl group of component B) there is from 0.3 to 1 uretdione group of component A), and the catalyst under C) is 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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