Patent ID: 7160973

Claim:
A composition comprising a reaction product of a. a diisocyanate comprising at least one of 1,6-hexamethylene diisocyanate, or bis(4-isocyantocyclohexyl) methane, or isophorone diisocyanate b. a chain extension agent having at least difunctional reactivity with an isocyanate, and c. a material comprising a blend of i. a primary carbamate material having at least one functional group reactive with an isocyanate and at least one primary carbamate group or a group convertible to a primary carbamate group, ii. a reaction product of the primary carbamate material (i) with an extending agent to form a prepolymer comprising repeating units of the extending agent, wherein the extending agent is a material that is reactive with the at least one of the functional groups of c (i) that is reactive with isocyanate and wherein the reaction product has at least one primary carbamate group or a group convertible to a primary carbamate group, wherein at least one of the following conditions are met in that the isocyanate groups of the diisocyanate have a different reactivity in relation to each other, or at least two of the groups with reactivity with an isocyanate on the chain extension agent have a different reactivity in relation to each other, and wherein b) and c) are reactive with a).