1,4-Butanediol, polymer with 1,1'-methylenebis(4-isocyanatobenzene) (9CI) 25805-16-7 Butanediol-MDI copolymer Isocyanic acid, methylenedi-p-phenylene ester, polymer with 1,4-butanediol (8CI) MDI-1,4-butanediol copolymer Polyurethane Y-302 Sanprene LQX 31 Y 302