Polymeric substrates coated with reaction product of hydroxy-terminated urethane and melamine resin

Claim 1

An article of manufacture comprising a polymeric substrate having a mar-resistant coating thereon, said coating consisting essentially of the acid catalyzed reaction product of a mixture of (1) and (2), in an amount ranging from about 5:1 to about 1:1, respectively, in which 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 iso- cyanate, and b. is a monomeric, sterically bulky, polyhydric alcohol containing 2-6 hydroxyl groups and being free of oxyalkylene units and 2. is a polyalkyl ether of a polymethylol melamine.