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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.
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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).
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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
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