Mar-resistant coating composition of reaction product of hydroxy-terminated urethane and melamine resin

Claim 1

A coating composition consisting essentially of a mixture of (1), (2) and (3), in which the ratio of (1) to (2) ranges from about 5:1 to about 1:1, respectively, and (1) is a saturated urethane prepolymer having terminal hydroxy groups which is the reaction product of materials consisting essentially of a mixture of (a) and (b), at a molar ratio of 1:2, respectively, in which (a) is an isocyanate-terminated urethane which is the reaction product of a mixture consisting essentially of (I) and (II), at a molar ratio of 1:2, respectively, in which (I) is a saturated diol having a molecular weight of from about 200 to about 3000, and (II) is a saturated organic diisocyanate, and (b) is a monomeric, sterically bulky, polyhydric alcohol containing 2-6 hydroxyl groups and being free of oxyalkylene units, (2) is a polyalkyl ether of a polymethylol melamine, and (3) is an acid catalyst.