Patent ID: 8420747

Claim:
A composition and a method of forming a coated substrate comprising: (i) an aliphatic or cycloaliphatic polycarbonate or a combination including at least one of the foregoing polycarbonates, and wherein the polycarbonate has repeating carbonate units of Formula II: wherein R is a divalent C 1 -C 30 aliphatic radical or a divalent C 3 -C 30 cycloaliphatic radical, wherein the polycarbonate includes at least one reactive hydroxyl group, said the polycarbonate is derived from a compound of formula I HO—R—OH Formula I wherein R is a divalent C 1 -C 30 aliphatic radical or a divalent C 3 -C 30 cycloaliphatic radical; wherein the polycarbonate has an equivalent molecular weight in a range from 500 grams per mole to 10,000 grams per mole, further wherein the polycarbonate has a T g in a range from 25° C. to 100° C., further wherein the polycarbonate is present in an amount corresponding to from 30 weight percent to 90 weight percent of a total weight of the composition; and (ii) an isocyanate crosslinking agent having at least one isocyanate functional group, wherein a ratio of isocyanate functional groups to reactive hydroxyl groups of the polycarbonate is in a range of from 0.5:1 to 1.5:1, wherein the composition is a curable powder coating composition.