Urethane foam rubber and composition for forming urethane foam rubber

Abstract

According to the present invention, a urethane foam rubber is constituted with a polymer having a moiety derived from a diisocyanate, and a moiety derived from a polyether polyol, number of atoms composing the shortest path along a bond intervening two NCO groups in at least a part of the diisocyanate is no less than 11, Mw of the polyether polyol is no less than 1,000 and no greater than 4,000, and the polymer exhibits at least one of the following features (i) to (iii): (i) having moieties derived from two or more types of the polyether polyols that are each different in terms of at least one of a weight average molecular weight and an oxyalkylene unit; (ii) having the moiety derived from the polyether polyol that includes two or more types of oxyalkylene units; and (iii) further having a moiety derived from a tri- or higher multi-functional isocyanate.

Dependencies are inferred from the claim text.