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15 records (took 0.025 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE59108444D1

    公开(公告)日：1997-02-13

    申请号：DE59108444

    申请日：1991-09-19

    Applicant: BASF AG

    Inventor： BAUMGARTNER EHRENFRIED DR ,  HOFMANN JUERGEN ,  JUNG RUDOLF H DR ,  MOORS RAINER DR ,  SCHAECH HANSJOERG

    IPC: C08F279/02 ,  C08F2/02 ,  C08F2/04 ,  C08F2/06 ,  C08F4/32 ,  C08F279/00 ,  C08F279/04

    Abstract: A process for the continuous preparation of high-impact polystyrene-acrylonitrile (ABS) by the free radical-initiated polymerisation of a mixture of from 60 to 90% by weight of at least one vinyl aromatic monomer and from 10 to 40% by weight of at least one further ethylenically unsaturated monomer in the presence of from 5 to 30% by weight, based on the sum of the monomers, of polybutadiene having a solution viscosity (5% strength by weight in styrene at 25 DEG C) of from 25 to 95 mPa.s and optionally in a solvent, in at least three series-connected reactors operating essentially with no back-mixing, at reaction temperatures of from 50 to 170 DEG C, phase inversion occurring in one of the reactors, the polymerisation being carried out as far as phase inversion at a temperature of 90 DEG C or below and being initiated by free radicals formed from the decomposition of tert.-butyl peresters whose half life period at 90 DEG C is not more than 20 minutes, the polybutadiene content, based on the total reaction mixture, being at least 10% by weight, and at most 25% of the entire amount of chain-transfer agent (regulator) required being added before phase inversion and the remainder thereafter.

    Process for the preparation of thermoplastic copolymers
    3.
    发明专利
    Process for the preparation of thermoplastic copolymers 未知

    公开(公告)号：DE3430247A1

    公开(公告)日：1986-02-27

    申请号：DE3430247

    申请日：1984-08-17

    Applicant: BASF AG

    Inventor： REFFERT RUDI WILHELM ,  HAMBRECHT JUERGEN DR ,  JUNG RUDOLF H DR ,  SCHAECH HANSJOERG ,  GAUSEPOHL HERMANN DR ,  SIEBEL PETER DR ,  SCHWAAB JOSEF DR ,  ECHTE ADOLF DR

    IPC: C08F212/00 ,  C08F212/08

    Abstract: The invention relates to a process for the preparation of thermoplastic copolymers by continuous polymerisation of a mixture of a) a vinylaromatic monomer and b) a monomer from the group consisting of nitriles and esters of (meth)acrylic acid and of maleic anhydride, in bulk or in solution in the presence of small amounts of water, it being possible for an elastomer having a glass transition temperature of below 0 DEG C which may already be dissolved in the mixture or the components of the mixture to be present, in at least one mixed (stirred) reactor under steady-state conditions with dissipation of the heat of reaction by evaporative cooling, and subsequent discharge of the reaction products from the reactor and conventional isolation of the copolymers and recovery of the unreacted monomers, alone or together with a solvent, if one was used, and recycling thereof into the reactor together with the mixture of a) and b), where the polymerisation is carried out with the proviso that from 1 to 25% by weight of steam, based on the gases present in the vapour space of the reactor, are present in the vapour space and the reactor discharge contains less than 0.1% by weight of water.

    10.
    发明专利
    未知

    公开(公告)号：DE59207600D1

    公开(公告)日：1997-01-16

    申请号：DE59207600

    申请日：1992-03-11

    Applicant: BASF AG

    Inventor： BAUMGARTNER EHRENFRIED DR ,  HOFMANN JUERGEN ,  JUNG RUDOLF ,  MOORS RAINER DR ,  SCHAECH HANSJOERG

    IPC: C08L25/12 ,  C08L55/02

    Abstract: The invention relates to rubber-modified, high-impact moulding compositions containing, based on the sum of A, B1 and B2, A: from 70 to 98% by weight of a polymer matrix A, formed by free radical-initiated polymerisation of a mixture of from 60 to 90% by weight of styrene and from 10 to 40% by weight of acrylonitrile, and B1: from 1 to 29% by weight of a particulate, first graft polymer B1 distributed in the matrix and comprising a graft base of polybutadien and graft branches of a copolymer of styrene and acrylonitrile, having a mean particle size of from about 100 to 500 nm, B2: from 1 to 29% by weight of a particulate, second graft copolymer B2 distributed in the matrix and comprising a graft base of polybutadien and graft branches of a copolymer of styrene and acrylonitrile having a mean particle size of from 600 to 10000 nm, as obtained by preparing the two graft copolymers in solution and/or bulk and incorporating them into the polymer matrix in a conventional manner. e

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