PROCESS FOR PRODUCING HARD POLYURETHANE FOAMS

摘要

PCT No. PCT/EP94/03688 Sec. 371 Date May 15, 1996 Sec. 102(e) Date May 15, 1996 PCT Filed Nov. 9, 1994 PCT Pub. No. WO95/14730 PCT Pub. Date Jun. 1, 1995Rigid foams which possess urethane groups are prepared by reacting polyisocyanates with compounds which possess at least two active hydrogen atoms which are reactive towards isocyanate groups, in the presence of water and alkanes as blowing agent and solution promoters. The solution promoter used is a compound with a polar group.