公开(公告)号：DE3922207A1

公开(公告)日：1991-01-17

申请号：DE3922207

申请日：1989-07-06

Applicant: BASF AG

Inventor： GRAVE DE ISIDOOR DR ,  HAARDT UDO ,  KOEGEL WOLFRAM ,  KRUECKAU FRITZ ERNST ,  TATZEL HERMANN

IPC: C08J9/22

Abstract: Foam particles of propylene polymers which have shrunk from 40 to 95% of their original volume and have a bulk density of from 10 to 30 g/1 can be expanded if they are treated with air or nitrogen under superatmospheric pressure, subsequently decompressed. If desired post-foamed by heating and, after aging, re-treated with air or nitrogen under superatmospheric pressure, subsequently decompressed and aged under atmospheric pressure until the pressure in the cells has dissipated.