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公开(公告)号：DE59106578D1
公开(公告)日：1995-11-02
申请号：DE59106578
申请日：1991-07-26
Applicant: BASF AG
Inventor： WALTER MANFRED DR , WASSMER KARL-HEINZ DR , LORENZ MARIA DR
Abstract: Bead-form, antistatic, expandable styrene polymers containing …… a) a styrene polymer, … b) from 0.5 to 3% by weight, based on a), of a coating containing …… b1)from 10 to 70% by weight of finely divided silica, … b2)from 20 to 80% by weight of a hydroxyl-containing quaternary ammonium salt and, if desired, … b3)from 0.05 to 20% by weight of a conventional adhesion promoter and … b4)from 10 to 30% by weight of a conventional agent for shortening the cooling time, …… c) from 1 to 8% by weight, based on a), of a C3- to C6-hydrocarbon as blowing agent, and, if desired, … d) conventional additives in effective amounts. …
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公开(公告)号：DE4220242A1
公开(公告)日：1993-12-23
申请号：DE4220242
申请日：1992-06-20
Applicant: BASF AG
Inventor： WITT MICHAEL DR , HAHN KLAUS DR , LORENZ MARIA DR
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.
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公开(公告)号：DE4024871A1
公开(公告)日：1992-02-13
申请号：DE4024871
申请日：1990-08-06
Applicant: BASF AG
Inventor： WALTER MANFRED DR , WASSMER KARL-HEINZ DR , LORENZ MARIA DR
Abstract: Bead-form, antistatic, expandable styrene polymers containing …… a) a styrene polymer, … b) from 0.5 to 3% by weight, based on a), of a coating containing …… b1)from 10 to 70% by weight of finely divided silica, … b2)from 20 to 80% by weight of a hydroxyl-containing quaternary ammonium salt and, if desired, … b3)from 0.05 to 20% by weight of a conventional adhesion promoter and … b4)from 10 to 30% by weight of a conventional agent for shortening the cooling time, …… c) from 1 to 8% by weight, based on a), of a C3- to C6-hydrocarbon as blowing agent, and, if desired, … d) conventional additives in effective amounts. …
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