公开(公告)号：DE19545098A1

公开(公告)日：1997-06-05

申请号：DE19545098

申请日：1995-12-04

Applicant: BASF AG

Inventor： FISCHER JOACHIM DR ,  RIEGER JENS DR ,  HAHN KLAUS DR ,  GRAVE ISIDOR DE DR ,  KOEGEL WOLFRAM DIPL ING

IPC: B29C44/34 ,  C08J9/04 ,  C08J9/16 ,  C08J9/22 ,  C08J9/228 ,  C08L23/14 ,  C08L23/02 ,  C08J9/06 ,  C08J9/12

Abstract: The preparation of polyolefin foam particles of bulk density 20 - 100 g / l comprises: (A) pre-foamed particles of bulk density 120 - 400 g / l are prepared by extrusion and granulation of polyolefin containing propellent ; and (B) the particles are further foamed in one or more steps without the use of propellent, by treating with 1.5 - 8 bar steam for 5 - 120 seconds at 110 - 170 degrees C.