Polyurethane, process for its production and polyester diol used for its production.

摘要

Provided are a polyurethane comprising (A) a structural unit derived from polyester diol, which consists essentially of 1 to 3 members selected from the structural units (I), (II) and (III) shown below, and the structural units (IV) and (V) shown below, the molar fractions of these structural units satisfying specific relationships: (I) : -O &lparstr& CH2 &rparstr& @O- wherein m represents an integer of 8 to 10 <CHEM> (III) :-O-R<1>-O- wherein R<1> represents a branched primary glycol residue having 4 to 8 carbon atoms (IV) : -O &lparstr& CH2 &lparstr& @O- (V) : @(CH2 &lparstr& @- wherein n represents an integer of 4 to 8, and (B) a structural unit derived from a diisocyanate; a process for producing the same; and the polyester diol used for the preparation of the same.