Patent ID: 8900667

Claim:
A coating composition comprising: (a) a polymer comprising two or more repeat units within a polymer chain, the polymer comprising the reaction product of reactants comprising: (i) a polycarbodiimide; and (ii) a ketocarboxylic acid having a (—COOH) group and one of a (—C—CO—C—) group and a (—C—CO—H) group wherein keto functional groups are within the repeat units of the polymer chain; and (b) a compound comprising functional groups reactive with keto functional groups; and wherein the polymer (a) comprises (1) and/or (2), wherein: (1) is a polymer comprising units of the structure: and (2) is a polymer comprising units of the structure: wherein (i) e is an integer of from 1 to 20; (ii) n is an integer of from 1 to 4; (iii) f is an integer of from 1 to 20; (iv) E is either a single bond or a group selected from O—X—O or S—X—S, wherein X is a divalent hydrocarbon group or a divalent silyl ether group; (v) R 1 and R 2 are each independently a divalent hydrocarbon group; and (vi) each R 3 is independently hydrogen or a monovalent hydrocarbon group.