Patent ID: 6103826
Filing Date: 2000-08-15
Classification: C08G,C09D

Abstract:
A clear, topcoat coating composition which is effective for application over a pigmented basecoat composition, the topcoat coating composition comprising a polymeric vehicle which comprises:a phenolic ester compound selected from the group consisting of a phenolic ester alcohol having the structural formula ##STR35## phenolic urethane having the structural formula ##STR36## a phenolic blocked isocyanate having the structural formula (a) ##STR37## phenolic blocked isocyanates having the structural formula (b) ##STR38## and mixtures thereof, wherein R.sub.4 is selected from the group consisting of hydrogen, halogen, hydroxyl, C.sub.1 to C.sub.8 alkyl and C.sub.1 to C.sub.8 alkoxy, R.sub.5 is selected from the group consisting of a direct bond, C.sub.1 to C.sub.20 organic radical having only carbon and hydrogen atoms, and a C.sub.1 to C.sub.20 organic radical which includes in its structure a substitution group selected from the group consisting of phenol, aliphatic hydroxyl, ester, ether, carbonate and combinations thereof, R.sub.6 is selected from the group consisting of hydrogen, a C.sub.1 to C.sub.20 organic radical, and a C.sub.1 to C.sub.20 organic radical which includes in its structure at least one ester linkage or a direct bond which forms with R.sub.7 part of a 5 or 6 carbon atom cyclic ring structure, R.sub.7 is CH.sub.2 R.sub.8 wherein R.sub.8 is selected from the group consisting of hydroxy, OR.sub.9, ##STR39## and R.sub.11, wherein R.sub.9 is selected from the group consisting of a primary aliphatic group containing 3 to 20 carbon atoms, a secondary aliphatic group containing 3 to 20 carbon atoms, an aromatic group containing 6 to 20 carbon atoms, a primary aliphatic group containing 3 to 20 carbon atoms which includes at least one ester linkage and a secondary aliphatic group containing 3 to 20 carbon atoms which includes at least one ester linkage, wherein R.sub.10, is selected from the group consisting of a primary aliphatic group containing 4 to 20 carbon atoms, a secondary aliphatic group containing 4 to 20 carbon atoms, a tertiary aliphatic group containing 4 to 20 carbon atoms, an aromatic group containing 6 to 20 carbon atoms and combinations thereof, wherein the primary, secondary and tertiary aliphatic groups include at least one ester linkage, and wherein R.sub.11 is selected from the group consisting of a C.sub.2 to C.sub.20 organic radical, a C.sub.2 to C.sub.20 organic radical which includes in its structure at least one ester linkage, a C.sub.2 to C.sub.20 organic radical which forms with R.sub.6 part of a 5 or 6 carbon atom cyclic ring structure, where y=1 to 20, y.sub.1 =1 to 4 and where R.sub.12 is selected from the group consisting of alkyl, an alkyl difunctional radical, alkenyl, alkenyl difunctional radical, aromatic and an aromatic difunctional radical and wherein the molecular weight of the phenolic ester alcohol is not more than about 1500 and the molecular weights of the phenolic urethane and phenolic blocked isocyanate are not more than about 50,000;a crosslinker blend comprising a polyisocyanate compound and an amino resin; anda polyol which is not a phenolic ester alcohol and is selected from the group consisting of a polyester polyol, an acrylic polyol, an alkyd polyol and mixtures thereof, the phenolic ester compound, crosslinker blend and polyol being in amounts which are effective for providing a cured clearcoat coating binder having a Tukon hardness of at least about 5 knoops at a film thickness of about 1.0 mil dry.