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1.
公开(公告)号:AT97673T
公开(公告)日:1993-12-15
申请号:AT85111666
申请日:1985-09-14
Applicant: BASF AG
Inventor: ZIEGLER WALTER , BRANDSTETTER FRANZ , REIMANN HORST , BALL WOLFGANG , WITTMER PAUL
IPC: C08F210/02
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公开(公告)号:DE3587665D1
公开(公告)日:1994-01-05
申请号:DE3587665
申请日:1985-09-14
Applicant: BASF AG
Inventor: ZIEGLER WALTER , BRANDSTETTER FRANZ , REIMANN HORST , BALL WOLFGANG , WITTMER PAUL
IPC: C08F210/02
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公开(公告)号:CA1180840A
公开(公告)日:1985-01-08
申请号:CA383818
申请日:1981-08-13
Applicant: BASF AG
Inventor: HEINZ GERHARD , SCHMITT BURGHARD , DORN INGO H , GAUSEPOHL HERMANN , GERBERDING KARL , JUNG RUDOLF H , MITTNACHT HANS , POEHRT JUERGEN , WITTMER PAUL
IPC: C08F297/04 , C08G81/02
Abstract: of the disclosure: A process for the preparation of branched block copolymers of from 60 to 95 % by weight of a monovinyl-aromatic monomer and from 40 to 5 % by weight of a conjugated diene by polymerizing the monomers in an inert solvent in the presence of a monolithiumhydrocarbon as the initiator, wherein, in a first process stage (a), from 50 to 80, or where necessary at most 90, % by weight of the total amount of monovinyl-aromatic compound are polymerized to virtually complete conversion in the presence of a relatively small amount of the monolithium-hydrocarbon. This stage is carried out by starting with from 30 to 70 % by weight of the vinylaromatic monomer and adding from 70 to 30 % by weight in the feed, during the polymerization, in such a way that the polymerization temperature, which at the start of the polymerization is from 30 to 40.degree.C, is kept at from 45 to 70.degree.C, with use of reflux cooling. After all the monomer feed has been added the reaction temperature is lowered to 30- 40.degree.C by evaporative cooling. In a second process stage (b), an additional amount of initiator is added to the reaction solution, after which from 1 to 30 % by weight of the total amount of monovinyl-aromatic monomer can be added, the sum of the amounts of monovinylaromatic monomer added in the first and second process stages being at most 90 % by weight of the total amount of monovinyl-aromatic monomer. The monovinyl-aromatic monomer added in the second process stage is polymerized to virtually complete conversion, employing the temperature profile described for stage (a). In process stage (c), the remainder of the monovinyl-aromatic monomer and all of the conjugated diene are added, at least predominantly in the form of a mixture, and polymerized so that the reaction temperature does not rise above 90 - 110.degree.C. Finally, after virtually complete conversion of the monomers, and preferably without prior cooling, a suitable liquid polyfunctional coupling agent is run in undiluted and the mixture of the linear block copolymers obtained, which still contain active terminal lithium-carbon bonds, is coupled, with stirring, to form branched block copolymers. The products prepared according to the invention are used for injection molding.
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公开(公告)号:CA824207A
公开(公告)日:1969-09-30
申请号:CA824207D
Applicant: BASF AG
Inventor: WITTMER PAUL , DOERFEL HELMUT , BECHT GUENTER
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公开(公告)号:CA1215200A
公开(公告)日:1986-12-09
申请号:CA436905
申请日:1983-09-16
Applicant: BASF AG
Inventor: HAHN KLAUS , WITTMER PAUL , DE GRAVE ISIDOOR , SCHICK RUPERT , ECHTE ADOLF
Abstract: of the disclosure: Particulate polystyrene containing blowing agent and having improved expandability is based on polystyrene having a weight-average mean molecular weight of not more than from 130,000 to 180,000 and a molecular weight distribution curve in which the high molecular weight flank drops steeply. The expandable polystyrene particles are produced by polymerizing styrene in aqueous suspension in the presence of blowing agents and of chain transfer agents or styrene oligomers.
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公开(公告)号:DE3434380A1
公开(公告)日:1986-03-27
申请号:DE3434380
申请日:1984-09-19
Applicant: BASF AG
Inventor: ZIEGLER WALTER , BRANDSTETTER FRANZ , REIMANN HORST , BALL WOLFGANG , WITTMER PAUL
IPC: C08F210/02 , C08F220/12
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