公开(公告)号：DE3220856A1

公开(公告)日：1982-12-23

申请号：DE3220856

申请日：1982-06-03

Applicant: BASF AG

Inventor： HAMBRECHT JUERGEN DR DIPL CHEM ,  BRANDSTETTER FRANZ DR DIPL CHE ,  ECHTE ADOLF DR DIPL-CHEM ,  LINDENSCHMIDT GERHARD DR DIPL ,  PRIEBE EDMUND DR DIPL CHEM

IPC: B29C44/34 ,  C08J9/00 ,  B29D27/00

Abstract: The invention relates to a process for the preparation of foams by melting a thermoplastic, mixing the melt with a volatile blowing agent at a pressure of from 25 to 250 bar, decompressing the mixture to atmospheric pressure, and cooling the foam. The plastic used is a mixture of A) from 95 to 20% by weight of a styrene polymer and B) from 5 to 80% by weight of polyphenylene oxide. The resultant foams having high heat distortion resistance can be used as insulating materials.