Synonyms: Poly(oxytetramethyleneoxycarbonyliminohexamethyleneiminocarbonyl)(8CI); 1,4-Butanediol-HMDI copolymer sru; 1,4-Butanediol-hexamethylenediisocyanate copolymer, sru; 1,4-Butanediol-hexamethylene diisocyanate polymer,SRU; 1,4-Butanediol-hexamethylene isocyanate polymer, SRU;Butanediol-hexamethylene diisocyanate copolymer SRU; Poly(imino-1,6-hexanediyliminocarbonyloxy-1,4-butanediyloxycarbonyl)