Patent ID: 8420217

Claim:
An elastic bonding film comprising an elastic, thermoset core layer bonded to at least one thermoplastic bonding layer; wherein the core layer comprises the cured reaction product of a composition comprising (i) a multifunctional isocyanate and (ii) a combination of polyols comprising x mole fraction of equivalents of (a) polyester diol, wherein x is between 0.25 and 0.6, inclusive, y mole fraction of equivalents of (b) crosslinker, wherein y is between 0.15 and 0.4, inclusive, and z mole fraction of equivalents of (c) hard segment; wherein z is between 0.2 and 0.45, inclusive; wherein the sum of x, y, and z is 1; wherein, the ratio of isocyanate groups to hydroxyl groups in the combination of polyols is at least 1.05; and the hard segment is an alkyl diol containing 2 to 6 carbon atoms.