Heat curable coating compositions and their use as top coats

Details Heat curable coating compositions and their use as top coats Heat curable coating compositions and their use as top coats

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2149361

The present invention relates to heat curable coating compositions containing a binder consisting essentially of A) prepolymers which have butanone oxime-blocked isocyanate groups and are prepared from A1) (cyclo)aliphatic polyisocyanates and A2) an organic polyhydroxyl component in which A2.1) 50 to 90% of the hydroxyl equivalents of component A2) are from polyester polyols, A2.2) 10 to 50 % of the hydroxyl equivalents of component A2) are from polyacrylate polyols and/or alkoxylation products of bisphenol A and A2.3) 0 to 30 of the hydroxyl equivalents of component A2) are from other organic polyhydroxyl compounds, and B) cycloaliphatic polyamines having at least two primary amino groups, wherein components A) and B) are present in an equivalent ratio of blocked isocyanate groups to amino groups of 1:0.8 to 1:1.2. The invention also relates to the use of these coating compositions for producing decorative, flying-stone-resistant, thick topcoats on metallic substrates.

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