Patent ID: 6827980
Filing Date: 2004-12-07
Classification: B05D,B29C,B32B,C08K,C08L,C09D,Y10T

Abstract:
A method of coating a metal substrate comprising:(a) heating the metal substrate to a temperature of about 120Â° C. to about 250Â° C. to provide a preheated metal substrate; (b) heating a solid, thermoplastic coating composition to a sufficient temperature to melt the coating composition while avoiding curing and degradation of the composition, and provide a molten coating composition, said coating composition comprising: about 50% to about 100%, by total weight of the composition, of two or more polyesters, each having a weight average molecular weight of about 10,000 to about 50,000, a glass transition temperature of about âˆ’30Â° C. to about 120Â° C., and a softening point of about 120Â° C. to about 200Â° C., wherein the two or more polyesters have different molecular weights; (c) extruding the molten coating composition onto a surface of the preheated metal substrate to provide a layer of molten coating composition less than about 40 microns thick on the preheated metal substrate and provide a coated metal substrate; and (d) allowing the coated metal substrate to cool.