C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 5/03 (2006.01) C08G 18/62 (2006.01) C08G 18/75 (2006.01) C08G 18/80 (2006.01) C09D 175/14 (2006.01)
Patent
CA 2069719
The present invention relates to a powder coating composition for the production of non-yellowing flexible coatings which is solid below 30°C and liquid above 120°C and contains a mixture of A) a polyisocyanate component which i) has a content of blocked isocyanate groups (expressed as NCO, molecular weight = 42) of 3.0 to 14.0 by weight, ii) has a functionality, based on the blocked isocyanate groups, of 1.9 to 2.3 and iii) and contains at least one .epsilon.-caprolactam-blocked polyisocyanate based on the reaction product of 4,4'-diisocyanatodicyclohexyl methane with a polyol component having an average molecular weight of 90 to 400 and containing at least 50% by weight, based on the weight of the polyol component, of one or mere (cyclo)aliphatic diols containing 4 to 12 carbon atoms, B) a polyol component containing at least one polyhydroxy polyacrylate having an OH number of 40 to 120 and C) an organotin catalyst for the reaction between hydroxyl groups and blocked isocyanate groups, wherein components A) and B) are present in quantities which correspond to an equivalent ratio of blocked polyisocyanate groups to hydroxyl groups of 0.5:1 to 1.2:1 The present invention also relates to the a heat-resistant substrate which is coated with this powder coating composition.
Bock Manfred
Halpaap Reinhard
Kreuder Hans-Joachim
Rettig Rainer
Schultz Wolfgang
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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