公开(公告)号：DE2520635A1

公开(公告)日：1976-11-18

申请号：DE2520635

申请日：1975-05-09

Applicant: BASF AG

Inventor： NINTZ ECKHARD DIPL CHEM DR ,  SCHICK RUPERT DIPL CHEM DR ,  SEEGMUELLER KARL DIPL CHEM DR ,  STAHNECKER ERHARD DIPL CHEM DR

IPC: C08F2/00 ,  C08F2/18 ,  C08J9/00 ,  C08J9/12 ,  C08J9/16 ,  F01D5/10 ,  F01D11/08 ,  F04D29/08 ,  F04D29/66 ,  F16J15/44 ,  C08F12/08

公开(公告)号：DE2510937A1

公开(公告)日：1976-09-30

申请号：DE2510937

申请日：1975-03-13

Applicant: BASF AG

Inventor： NINTZ ECKHARD DIPL CHEM DR ,  KEPPLER HANS GEORG DIPL ING DR ,  STAHNECKER ERHARD DIPL CHEM DR

IPC: C08F12/08 ,  C08J9/20

Abstract: Expandable polystyrene particle prepn. by suspension polymerisation of styrene and opt. further co-monomers in the presence of organic suspension stabilisers and blowing agents, takes place in the presence of 0.001-0.4 (0.01-0.2) wt. %, w.r.t. aq. phase of polymerisation batch, of phosphates and/or carbonates of Ca and/or Mg. Method is used in prodn. of foamed articles, by heating pre-foamed compsn. in moulds and sintering. Particles obtd. have a low internal water content, e.g. 0.3-0.8 wt. %. Agglomeration of single particles on foaming is prevented. Waste water pollution by organic cpds. can be reduced by 60% w.r.t. standard processes.