Patent ID: 7998529

Claim:
A method for making a haze-free coated polymeric substrate at least partially coated with a self-healing coating, comprising: (a) depositing upon at least a portion of the polymeric substrate a self-healing coating composition comprising: (i) a polycarbonate comprising at least two isocyanate reactive groups per molecule; and (ii) a blocked polyisocyanate curing agent, wherein the blocking agent deblocks at a temperature no higher than 130° C., and wherein the blocked polyisocyanate curing agent comprises a tricarbamoyl triazine compound having the formula C 3 N 3 (NHCOXR) 3 , wherein X is nitrogen, oxygen, sulfur, phosphorus, or carbon, and R is a lower alkyl group having 1 to 12 carbon atoms or a mixture of lower alkyl groups having 1 to 12 carbon atoms; and (b) curing the coating composition by heating the composition to a temperature at or above the temperature at which the blocking agent deblocks, wherein the method produces a haze-free coated polymeric substrate having thereon a self-healing coating having a dry film thickness of at least 1 mil.