Patent ID: 7589149

Claim:
An ionomeric urea/urethane polymer comprising (a) repeating units derived from an aliphatic polyester polyol, and (b) repeating units derived from a polyisocyanate, wherein the urea/urethane polymer contains less than about 2 mole percent of urea units described by the formula —R—N(R 2 )—C(O)—N(R 2 )—R 1 ; wherein R is a C 6 -C 20 aromatic hydrocarbon radical, R 1 is a C 1 -C 20 aliphatic hydrocarbon radical, and R 2 is H or an amide group that is described by the formula C(O)—N(R 2 )—R—; and wherein the polyisocyanate is selected from the group consisting of toluene diisocyanate, methylene diphenyldiisocyanate, polymethylene polyphenylisocyanate, and mixtures thereof.