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：DE4118526A1

公开(公告)日：1991-12-19

申请号：DE4118526

申请日：1991-06-06

Applicant: BASF AG

Inventor： DEUSCHEL WALTER DR ,  LAY PETER N ,  WAGNER KURT JOSEF

IPC: C08F6/00

Abstract: Process is claimed for removing residual monomers and low-mol wt. impurities (I) from polymers in aq. dispersion by passing through the dispersion a stream of gas produced by means of a distributor device, the novelty is that the gas stream contains 0.01-0.5-1 liq. water per 100-1 gas. The process can be used with aq. dispersions (pref. 40-60 wt. %) of various polymers (based on styrene, olefins, dienes, acrylonitrile, acrylate, vinyl ethers, etc. contg. up to 1500 ppm (I), pref. the dispersion is treated at 70-80 deg.C with a stream of gas (nitrogen, air, etc) contg. water at 10-30 deg.C then worked up e.g. by spray drying. USE/ADVANTAGE - The process enables the removal of (I) from polymer dispersions without the disadvantages of prior art processes (high cost of steam treatment, breakdown of dispersions, coagulation).

公开(公告)号：DE3934796A1

公开(公告)日：1991-04-25

申请号：DE3934796

申请日：1989-10-19

Applicant: BASF AG

Inventor： DEUSCHEL WALTER DR ,  LAY PETER N

IPC: C07C17/38 ,  C07C21/06