公开(公告)号：DE4305697A1

公开(公告)日：1994-09-01

申请号：DE4305697

申请日：1993-02-25

Applicant: BASF AG

Inventor： SCHERZER DIETRICH DR ,  HAHN KLAUS DR ,  RIETHUES MICHAEL DR ,  NAEGELE DIETER DR ,  WITT MICHAEL DR ,  HUSEMANN WOLFRAM DR

IPC: C08F2/20 ,  C08F2/44 ,  C08J9/00 ,  C08J9/20 ,  C08K5/00 ,  C08K5/01 ,  C08K5/03 ,  C08L23/06 ,  C08L25/04 ,  C08L25/06 ,  C08L89/00 ,  C08F12/08

公开(公告)号：DE4220225A1

公开(公告)日：1993-12-23

申请号：DE4220225

申请日：1992-06-20

Applicant: BASF AG

Inventor： WITT MICHAEL DR ,  WALTER MANFRED DR

IPC: C08J9/16 ,  C08F2/18 ,  C08F2/44 ,  C08F12/00 ,  C08F12/08 ,  C08J9/12 ,  C08J9/20 ,  C08L25/04 ,  C08J9/14 ,  C08J9/30 ,  C08K3/32 ,  C08K5/42 ,  C08K5/09

Abstract: Bead-formed expandable styrene polymers are obtained by suspension polymerisation of styrene with addition of from 1 to 10% by weight of C3- to C7-hydrocarbons and/or carbon dioxide as blowing agent and optionally conventional additives, where the suspension stabiliser used is a mixture of magnesium pyrophosphate, a sulphonate group-containing extender and an alkali or alkaline-earth metal carboxylate, magnesium pyrophosphate being prepared directly before the polymerisation by combining an aqueous solution with an alkali metal pyrophosphate with at least the stoichiometrically necessary amount of a magnesium salt.

公开(公告)号：ES2131247T3

公开(公告)日：1999-07-16

申请号：ES95116406

申请日：1995-10-18

Applicant: BASF AG

Inventor： SCHERZER DIETRICH DR ,  HUSEMANN WOLFRAM DR ,  WITT MICHAEL DR ,  HAHN KLAUS DR ,  KAEMPFER KNUT DR ,  ALICKE GERHARD

IPC: C08F2/18 ,  C08F2/20 ,  C08F2/38 ,  C08F12/08 ,  C08F255/02 ,  C08F257/00 ,  C08F257/02 ,  C08J9/20 ,  C08J11/08 ,  C08L23/06 ,  C08L25/00 ,  C08L25/04 ,  C08L25/06

Abstract: Expandable polystyrene contains up to 40 wt.% recycled polystyrene. It is obtd. by dissolving the recycled material in styrene monomer and polymerising this soln. in aq. suspension, with addn. of finely-divided polyethylene wax (I) and/or a mol.wt. regulator (II) during polymerisation. Pref. the material is treated with 0.05-1.0 wt.% (I) and/or 10-5000 ppm (II). (I) has a Mn of 2000-6000. (II) is dimerised alpha -methylstyrene.

公开(公告)号：DE19645948A1

公开(公告)日：1998-05-14

申请号：DE19645948

申请日：1996-11-07

Applicant: BASF AG

Inventor： BAUMGAERTEL MICHAEL DR ,  DEMBEK GERHARD DR ,  HAHN KLAUS DR ,  HOLOCH JAN DR ,  HUSEMANN WOLFRAM DR ,  KAEMPFER KNUT DR ,  LAY PETER N ,  RUECK SWEN ,  SCHIESL MICHAEL ,  WITT MICHAEL DR

IPC: C08F257/02 ,  C08J9/20 ,  C08F12/08 ,  C08L25/06

Abstract: The invention concerns a continuous process for preparing expandible styrene polymers by polymerizing styrene in the presence of expanding agents in three stages: a) preparing a solution of polystyrene in styrene; b) dispersing the solution in an aqueous phase; and c) continuously polymerizing out the prepolymer in an aqueous suspension.

公开(公告)号：DE59403492D1

公开(公告)日：1997-09-04

申请号：DE59403492

申请日：1994-02-10

Applicant: BASF AG

Inventor： SCHERZER DIETRICH DR ,  HAHN KLAUS DR ,  RIETHUES MICHAEL DR ,  NAEGELE DIETER DR ,  WITT MICHAEL DR ,  HUSEMANN WOLFRAM DR

IPC: C08F2/20 ,  C08F2/44 ,  C08J9/00 ,  C08J9/20 ,  C08K5/00 ,  C08K5/01 ,  C08K5/03 ,  C08L23/06 ,  C08L25/04 ,  C08L25/06 ,  C08L89/00

公开(公告)号：DE59403067D1

公开(公告)日：1997-07-17

申请号：DE59403067

申请日：1994-03-08

Applicant: BASF AG

Inventor： WITT MICHAEL DR ,  SCHERZER DIETRICH DR ,  HAHN KLAUS DR ,  HENN ROLF DR ,  BACK WOLF-DIETER DR

IPC: C08J11/14 ,  A61L9/01 ,  C08J11/06 ,  C08J11/16

公开(公告)号：DE59302659D1

公开(公告)日：1996-06-27

申请号：DE59302659

申请日：1993-06-16

Applicant: BASF AG

Inventor： WITT MICHAEL DR ,  WALTER MANFRED DR

IPC: C08J9/16 ,  C08F2/18 ,  C08F2/44 ,  C08F12/00 ,  C08F12/08 ,  C08J9/12 ,  C08J9/20

Abstract: Bead-formed expandable styrene polymers are obtained by suspension polymerisation of styrene with addition of from 1 to 10% by weight of C3- to C7-hydrocarbons and/or carbon dioxide as blowing agent and optionally conventional additives, where the suspension stabiliser used is a mixture of magnesium pyrophosphate, a sulphonate group-containing extender and an alkali or alkaline-earth metal carboxylate, magnesium pyrophosphate being prepared directly before the polymerisation by combining an aqueous solution with an alkali metal pyrophosphate with at least the stoichiometrically necessary amount of a magnesium salt.

公开(公告)号：ES2084416T3

公开(公告)日：1996-05-01

申请号：ES93109565

申请日：1993-06-16

Applicant: BASF AG

Inventor： WITT MICHAEL DR ,  HAHN KLAUS DR ,  LORENZ MARIA DR

IPC: C08J9/18

Abstract: A process for the preparation of expandable thermoplastic polymers by post-impregnation with a blowing agent in liquid suspension in the presence of a mixture of magnesium pyrophosphate and a sulphonate group-containing extender as suspension stabiliser in a reactor, characterised in that a) the magnesium pyrophosphate is prepared in the same reactor at a temperature below 50 DEG C by addition of a solid magnesium salt in an amount corresponding to an at least 3% stoichiometric excess, based on pyrophosphate, to an aqueous solution of the pyrophosphate, b) the suspension medium is heated to a temperature in the range between 70 and 140 DEG C, and c) the blowing agent is added in this temperature range.

公开(公告)号：DE4340368A1

公开(公告)日：1995-06-01

申请号：DE4340368

申请日：1993-11-26

Applicant: BASF AG

Inventor： SCHERZER DIETRICH DR ,  HENN ROLF DR ,  HAHN KLAUS DR ,  WITT MICHAEL DR ,  HUSEMANN WOLFRAM DR ,  NAEGELE DIETER DR ,  RIETHUES MICHAEL DR ,  MATZKE GUENTER DR

IPC: C08F2/18 ,  C08F2/38 ,  C08F2/44 ,  C08J9/16 ,  C08L25/04 ,  B29B7/60 ,  B29B13/00 ,  B29C44/00 ,  C08F12/08 ,  C08J9/14 ,  C08J9/20 ,  C08K5/01

公开(公告)号：DE4331808A1

公开(公告)日：1995-03-23

申请号：DE4331808

申请日：1993-09-18

Applicant: BASF AG

Inventor： SCHERZER DIETRICH DR ,  HENN ROLF DR ,  WITT MICHAEL DR ,  HAHN KLAUS DR ,  RIETHUES MICHAEL DR

IPC: C08J9/16 ,  C08F2/18 ,  C08F2/44 ,  C08J9/20 ,  C08K5/134 ,  C08L25/04 ,  C08K5/13 ,  C08K5/521 ,  C08F12/06

Abstract: Pearl-shaped, expandable styrene polymers contain (a) a styrene polymer; (b) 0.03 to 1.5 % by weight, in relation to (a), of a sterically inhibited phenol homogenously distributed in the styrene polymer and/or applied as a coating on the surface of the styrene polymer; (c) an expanding agent or mixture of expanding agents; and if required (d) effective amounts of usual additives. Also disclosed is a process for producing said polymers, according to which styrene, if required with other comonomers, is polymerised in an aqueous suspension in the presence of suspension stabilisers and usual styrene-soluble polymerisation catalysts, with addition of an expanding agent or mixture of expanding agents, and if required of an effective amount of usual additives and of up to 1.5 % by weight, in relation to styrene and comonomers, of sterically hindered phenols. The thus obtained pearl-shaped, expandable styrene polymers are coated with up to 1.5 % by weight, in relation to the expanding agent-free styrene polymer, of sterically inhibited phenols, provided that the expandable styrene polymers that are homogenously distributed in the styrene polymer and/or applied as a surface coating contain in total 0.03 to 1.5 % by weight of sterically inhibited phenols, in relation to the styrene polymer.