Patent ID: 6809161
Filing Date: 2004-10-26
Classification: C08G,C08L,C09D,Y10T

Abstract:
A curable powder coating composition comprising a solid particulate film-forming mixture of the following components:(1) a polymer containing reactive functional groups, said polymer having a glass transition temperature of at least 30Â° C.; and (2) a crosslinking agent having functional groups reactive with the functional groups of component (1), said crosslinking agent comprising an ungelled reaction product of the following reactants: (a) at least one aminoplast resin; and (b) a compound selected from at least one of (i) compounds having the following structure (I): â€ƒwherein X is aromatic; R1, R2, and R3 can be the same or different and each independently represents H, (cyclo)alkyl having from 1 to 12 carbon atoms, aryl, alkaryl, aralkyl, or an active hydrogen-containing group, â€ƒprovided that at least one of R1, R2, and R3 represents an active hydrogen-containing group which is reactive with the aminoplast resin (A); (ii) compounds having the following structure (II) or (III): where Râ€² and Râ€³ are the same or different and each independently represents an aromatic group or an alkyl group having 1 to 12 carbon atoms; and (iii) compounds different from (i) and (ii) and having a melting point of at least 80Â° C., wherein the crosslinking agent has a glass transition temperature of at least 10Â° C. and is essentially free of functional groups which are reactive with the aminoplast resin.