公开(公告)号：DE3851454D1

公开(公告)日：1994-10-20

申请号：DE3851454

申请日：1988-03-05

Applicant: BASF AG

Inventor： TATZEL HERMANN ,  ZUERN LUDWIG DR ,  ZETTLER HANS DIETER ,  SCHNEIDER WOLFBERG DR ,  DEMBEK GERHARD DR

IPC: B29C44/00 ,  B29B9/06 ,  B29C44/34 ,  B29C44/50 ,  B29K23/00 ,  C08J9/16 ,  C08J9/22 ,  C08J9/228 ,  B29C67/22

Abstract: Polyolefin foams which have a density of from 30 to 300 g/l, do not exhibit after-shrinkage and possess taut cells are prepared by letting down a polyolefin/blowing agent gel, the latter first being let down to 0.1-10 bar gage pressure and the foam being kept at this pressure until it has cooled to at least 20 DEG C. below the expansion temperature.