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    Transparent, thermoplastic moulding composition, process for its preparation, and its use
    2.
    发明专利
    Transparent, thermoplastic moulding composition, process for its preparation, and its use 未知

    公开(公告)号：DE3914812A1

    公开(公告)日：1989-11-23

    申请号：DE3914812

    申请日：1989-05-05

    Applicant: BASF AG

    Inventor： WALTER HANS-MICHAEL DR ,  BRONSTERT KLAUS DR ,  HECKMANN WALTER DR ,  POHRT JUERGEN ,  BENEDIX FRANZ

    IPC: C08L25/06 ,  C08L53/02

    Abstract: The invention relates to a transparent, thermoplastic moulding composition containing, based on A + B, A from 5 to 95% by weight of polystyrene which has been produced in a manner known per se by free-radical polymerisation, B from 95 to 5% by weight of a non-elastomeric block copolymer which is branched in a star-shaped manner, built up from, based on B, b1 from 60 to 95% by weight of styrene and b2 from 5 to 40% by weight of at least one conjugated diene having 4 or 5 carbon atoms, which has been prepared by sequential anionic polymerisation using at least one organolithium compound as initiator and in the presence of a solvent, where firstly, in a first process step, an amount of styrene S1 of from 50 to 80% by weight of the styrene, based on the total amount of styrene, is polymerised in the presence of an amount of initiator I1 and then, in a second process step, a smaller amount of styrene S2 is polymerised with simultaneous addition of a further amount of initiator I2, and, in a third process step of the polymerisation, a mixture of a residual amount of styrene, S3, and the total amount of the diene are reacted, followed by coupling and work-up of the reaction product, characterised in that the amount of initiator I1 in the 1st process step is from 0.05 to 1.0 mmol/100 g of total monomer and that, in the 2nd process step, an amount of styrene S2 of from 12 to 47% by weight of styrene, based on the total amount of styrene, ... in the presence of from 0.5 to 10 mmol/100 g ... Original abstract incomplete.

    4.
    发明专利
    未知

    公开(公告)号：DE3880792D1

    公开(公告)日：1993-06-09

    申请号：DE3880792

    申请日：1988-11-04

    Applicant: BASF AG

    Inventor： WALTER HANS-MICHAEL DR ,  POHRT JUERGEN ,  GAUSEPOHL HERMANN DR ,  BRONSTERT KLAUS DR ,  BENEDIX FRANZ

    IPC: C08F2/06 ,  C08F297/04

    Abstract: Discontinuous processes (A, B, C) for prepn. of the copolymers (I) contg. polymerised 50-95 wt.% styrene (S) and 50-5 wt.% 4 or 5C conjugated diene (B) on (I) comprise (1) sequential anionic polymerisation of (S) and (B) in presence of solvent using Li-organic cpd. as initiator (Ir), of which minor proportion is added at beginning of sequential polymerisation and major proportion afterwards, the sequentially added (S) and (B) portions each being completely polymerised (2) coupling mixt. of living block copolymer anions of bimodal mol. wt. distribution obtd. by this sequential anionic polymerisation with a polyfunctional coupling agent (3) opt. treatment with proton donor, (4) removal of solvent.

    Graft copolymer production with minimal reactor coating
    5.
    发明专利
    Graft copolymer production with minimal reactor coating 未知

    公开(公告)号：DE19752394A1

    公开(公告)日：1999-05-20

    申请号：DE19752394

    申请日：1997-11-19

    Applicant: BASF AG

    Inventor： GUENTHERBERG NORBERT DR ,  SUTORIS HEINZ FRIEDRICH DR ,  FISCHER MICHAEL DR ,  LYNCH JOHN DR ,  BENEDIX FRANZ ,  BARGHOORN PETER DR

    IPC: C08F4/00 ,  C08F265/04 ,  C08F279/02 ,  C08F265/06

    Abstract: Graft copolymers are obtained by an aqueous- phase process in which polymerization of the rubber-elastic base is taken to completion and an N-oxyl radical compound of a sec. amine with no hydrogens on the alpha -carbon atom is added before and/or during polymerization of the grafted shell. A process for the production, in the aqueous phase, of graft copolymers (A) of (a1) 30-95 wt% rubber-elastic graft base derived from (a11) 50-100 wt% conjugated diene and (a12) 0-50 wt% other monounsaturated monomer(s) or from (a11 asterisk ) 50-100 wt% 1-10C alkyl acrylate, (a12 asterisk ) 0-10 wt% polyfunctional crosslinking monomer and (a13 asterisk ) 0-40 wt% other monounsaturated monomer(s) and (a2) 5-70 wt% grafted shell derived from (a21) 50-100 wt% styrene compound of formula (S): R , R = H or 1-8 C alkyl (a22) 0-40 wt% (meth)acrylonitrile and (a23) 0-40 wt% other monounsaturated monomer(s). In this process, polymerization of the base stage (a1) is taken to completion and then at least one N-oxyl radical compound of a sec. amine with no hydrogen atoms on the alpha -carbon atom is added before and/or during polymerization stage (a2). An Independent claim is also included for graft copolymers obtained by this process.

    9.
    发明专利
    未知

    公开(公告)号：DE4443361A1

    公开(公告)日：1996-06-13

    申请号：DE4443361

    申请日：1994-12-06

    Applicant: BASF AG

    Inventor： NIESNER NORBERT DR ,  NAEGELE PAUL ,  BENEDIX FRANZ

    IPC: C08K5/00 ,  C08K5/13 ,  C08K5/1545 ,  C08K5/524 ,  C08L53/02 ,  C08K5/15 ,  C08K5/17

    Abstract: Disclosed is a molding composition made from linear or star-shaped styrene/butadiene block copolymers produced by anionic polymerization, of general structure (A)m-X, wherein A is a block copolymer section consisting of at least one polystyrene block with a molecular mass of 3,000 to 230,000 (g/mol) and a polybutadiene block with a molecular mass of 2,000 to 30,000 (g/mol), with A having a total molecular mass of 5,000 to 300,000 (g/mol), the block transitions are sharp or blurred and, to prevent decomposition due to light, atmospheric oxygen and/or heat, the molding composition contains 0.01 to 1 wt.% alpha -tocopherol, 0.1 to 2 wt.% organic phosphite of the general formula RO3P, in which R is alkyl, aryl or cycloalkyl, and 0.01 to 2 wt.% sterically hindered phenol.

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