公开(公告)号：DE19544487A1

公开(公告)日：1997-06-05

申请号：DE19544487

申请日：1995-11-29

Applicant: BASF AG

Inventor： WALTER MANFRED DR ,  KNOLL KONRAD DR ,  SCHNEIDER MICHAEL DR ,  WASMER KARL-HEINZ DR

IPC: C08J9/16 ,  C08F212/08 ,  C08F212/32 ,  C08J9/18 ,  C08J9/228 ,  C09K21/14 ,  C08L25/08 ,  C08L25/02 ,  B29C67/20

Abstract: The foam is based on a copolymer (I) of styrene with 2-50 mole-% 1,1-diphenylethene (II). Also claimed are methods for making the foam in various forms. The beads are produced by impregnating (I) granulate having an average diameter of 0.1-3 mm with a volatile blowing agent in aqueous suspension at 100-180 degrees C and then either (a) cooling the suspension, separating the granulate and foaming by supplying energy in a separate stage or (b) depressurising the hot suspension and hence foaming the granulate directly. Mouldings are made by from the prefoamed beads by foaming and welding in a mould. Boards and sheets are made by plasticising (I) in an extruder, mixing with a volatile blowing agent and extrusion through a wide slit die, with foaming.