Polyisobutylene-based polyurethanes

摘要

An elastomeric polymer, comprising (1) a hard segment in the amount of 10% to 60% by weight of the elastomeric polymer, wherein the hard segment includes a urethane, urea or urethaneurea; and (2) a soft segment in the amount of 40% to 90% by weight of the elastomeric polymer. The soft segment comprises (a) at least 2% by weight of the soft segment of at least one polyether macrodiol, and/or at least one polycarbonate macrodiol; and (b) at least 2% by weight of the soft segment of at least one polyisobutylene macrodiol and/or diamine.

主权项

1. An elastomeric polymer, consisting of:
(1) a hard segment in the amount of 32% to 36% by weight of the elastomeric polymer, wherein the hard segment consists of:
a urethane, urea or urethane urea;optionally at least one chain extender; andoptionally at least one diisocyanate residue; and (2) a soft segment in the amount of 64% to 68% by weight of the elastomeric polymer, wherein the soft segment consists of:
(a) about 10% to about 30% by weight of the soft segment of a combination of at least one polyether macrodiol and at least one polycarbonate macrodiol; and(b) about 70% to about 90% by weight of the soft segment of at least one polyisobutylene macrodiol and/or diamine; wherein the number average molecular weight of the elastomeric polymer is not less than 40 kilodaltons, and wherein the at least one polyether macrodiol is selected from the group consisting of poly(propylene oxide) diol, poly(trimethylene oxide) diol, poly(tetramethylene oxide) diol, poly(hexamethylene oxide) diol, poly(heptamethylene oxide) diol, poly(octamethylene oxide) diol and poly(decamethylene oxide) diol.