process for the manufacture of a flexible synthetic material, multiple acouches has flat sides, with a hairy coteexterieur active breathing.

摘要

1301945 Polyurethane solutions KALLE AG 7 Aug 1970 [11 Aug 1969] 38210/70 Heading C3R [Also in Division B2] A polyurethane solution is prepared by fusing and stirring diphenylmethane-4,41-diisocyanate with a polyester of molecular weight 1500 and OH number 73 derived from adipic acid and 4,4SP1/SP-dioxydibutylether, dissolving the preadduct in dimethyl formamide, adding a 5À12% solution of water in DMF and stirring for 5 hours at 30‹ C.