Patent ID: 8017720

Claim:
A sulfur-containing polyurethane comprising the reaction product of: (I) polyisocyanate, polyisothiocyanate, or mixture thereof; (II) polythiol oligomer; and (III) active hydrogen-containing material including at least one material selected from trifunctional or higher-functional polyol, trifunctional or higher-functional polythiol, trifunctional or higher-functional material containing both hydroxyl and SH groups, or mixtures thereof; wherein said polythiol oligomer (II) is the reaction product of: (a) two or more different dienes comprising (i) at least one first diene comprising an aromatic ring-containing diene, having the following structural formula: wherein R 4 can represent hydrogen or methyl; and (ii) at least one second diene selected from a non-aromatic monocyclic diene, and non-aromatic polycyclic diene; and (b) one or more dithiol; and wherein the stoichiometric ratio of the sum of the number of equivalents of all polythiols to the sum of the number of equivalents of all dienes used to form said polythiol oligomer (II) is greater than 1.0:1.0.