Patent ID: 8476396

Claim:
A two component elastomeric coating composition that includes a component A comprising isocyanate group containing compounds containing i) a mean NCO functionality less than or equal to 3.5; and ii) from 1.5 to 8 percent by weight, based on the isocyanate containing compound, of allophanate groups; and iii) one or more structural units conforming to the following formula wherein R 1 is selected from the group consisting of a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, wherein R 1 can optionally include from 1 to 3 NCO groups; R 2 is selected from the group consisting of a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, wherein R 2 can optionally include from 1 to 3 NCO groups; and R 3 is selected from the group consisting of a C 2 to C 32 linear or branched hydrocarbon group, a —CH3 terminated polyether, a polyester, and a polyurethane; wherein component A is substantially free of uretdione groups and is at least 90% aliphatic, based on the weight of component A; and a component B comprising a compound containing one or more functional groups that are reactive with isocyanate groups.