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21 records (took 0.021 seconds)

    16.
    发明专利
    未知

    公开(公告)号：DE3785743D1

    公开(公告)日：1993-06-09

    申请号：DE3785743

    申请日：1987-12-22

    Applicant: BASF AG

    Inventor： SCHWABEN HANS-DIETER DR ,  ECHTE ADOLF DR ,  BUESCHL RAINER DR ,  SCHLICHTMANN RAINER ,  KLAERNER PETER DR ,  KINDLER HUBERT DR

    IPC: C08F2/18 ,  C08F287/00 ,  C08L25/06 ,  C08L51/00

    Abstract: Thermoplastic moulding compsn. contains w.r.t. (A+B), (A) 80-60 (wt.)% rigid polystyrene matrix and (B) 20-40% soft phase, obtd. by polymerising styrene in the presence of a linear styrene-butadiene block copolymer with indistinct transition, which contains 35-45% styrene and 65-55% butadiene with a block polystyrene content of 25-35%. (B) is uniformly distributed in (A) and has a particle dia. of less than 0.8 micron. The average particle dia., d50 value (by vol.) of (B) is 0.252-0.38 micron, the particle size distribution range (d95-d5) value, is 0.2-0.6 micron, the d60 value, is in the 0.26-0.40 micron range and the d90 value is 0.40-0.75. (B) pref. contains 38-42% styrene and 62-58% butadiene with 25-35, esp. 30-32% block polystyrene. The average mol.wt. of (B) is 180000-250000 and the mol.wt. of the styrene block 50000-70000.

    17.
    发明专利
    未知

    公开(公告)号：DE3682459D1

    公开(公告)日：1991-12-19

    申请号：DE3682459

    申请日：1986-08-12

    Applicant: BASF AG

    Inventor： GOETTSCH MANFRED DR ,  KINDLER HUBERT DR ,  MOEDERSHEIM NORBERT ,  RUDOLPH GUENTHER RUDOLPH GUENT

    IPC: C08J3/20 ,  C08K5/02 ,  C08L25/06

    Abstract: Fire retardant polystyrene compsns. contg. (a) halogenated hydrocarbon flame retardant agents together with at least one of (b) a synergist for the (a), (c) stabilisers, (d) antioxidants and (e) additives, are made by a multistage mixing process comprising (1) premixing polystyrene with the (a) and part or all of the (c) at temps. up to 100 deg.C, (2) continuously feeding the premix into a continuously operating single or twin screw extruder or kneader, opt. together with further additives, (3) in a subsequent mixing zone of the extruder, feeding into the prod. stream a monomer- and solvent-free melt of a polystyrene resin at 200-250 deg.C, opt. together with other additives, and (4) extruding and granulating the resulting flame resistant polystyrene compsn..

    18.
    发明专利
    未知

    公开(公告)号：DE3844490A1

    公开(公告)日：1990-07-05

    申请号：DE3844490

    申请日：1988-12-31

    Applicant: BASF AG

    Inventor： SCHWABEN HANS-DIETER DR ,  SCHLICHTMANN RAINER ,  KINDLER HUBERT DR ,  KLAERNER PETER DR ,  MITTNACHT HANS DR

    IPC: C08F279/00 ,  C08F279/02 ,  C08L25/06 ,  C08L51/04

    Abstract: An impact-resistant thermoplastic molding material which contains, based in each case on A+B, from 80 to 50% by weight of a hard matrix A of polystyrene having a molecular weight &upbar& M eta of from 150,000 to 200,000 and from 50 to 20% by weight of a soft phase B which is uniformly distributed in the hard matrix and has a median particle diameter d50 (volume average) of from 1 to 10 mu m, and can be obtained by polymerizing styrene in the presence of an elastomeric grafting base, advantageously has a molecular weight of the grafted branches of from 1.1 to 1.35 times the molecular weight of the hard matrix, and the degree of grafting is from 50 to 100%.

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