Patent ID: 6284846
Filing Date: 2001-09-04
Classification: C08G,C09D

Abstract:
A powder coating composition comprising a film forming resin system, wherein said film forming resin system comprises:a. a crosslinker component comprising a polyfunctional isocyanate which is at least partially blocked with a mixture of the following:i. a polyhydroxy aromatic compound comprising at least one compound having at least one of the following structures:HO--.PHI..sup.1 --R.sup.1 --.PHI..sup.1 --OHwhere .PHI..sup.1 consists of a phenylene group, and R.sup.1 is an alkylene group having 0 to 4 carbon atoms, orHO--.PHI..sup.2 --OHwhere .PHI..sup.2 consists of a phenylene group or a naphthylene group, andii. a hydroxy-functional ester compound having the following structure:COOR.sup.2 --.PHI..sup.2 --OHwhere R.sup.2 is an alkyl group having from 1 to 4 carbon atoms, and .PHI..sup.2 consists of a phenylene group or a naphthylene group, wherein the ratio of polyhydroxy aromatic compound to the hydroxy-functional ester compound ranges from 0.01:1 to 1.4:1, andb. a polymer component comprising a polyester polyol which comprises a cycloaliphatic component, said cycloaliphatic component comprising the reaction product of:i. a cycloaliphatic acid comprising at least one compound selected from the group consisting of: the 1,2-isomer of hexahydrophthalic acid; the 1,3-isomer of hexahydrophthalic acid; and the 1,4-isomer of hexahydrophthalic acid, andii. a cyclic polyol comprising at least one compound selected from the group consisting of: cyclohexane dimethanol and cyclohexane diol.