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    PROCESS FOR THE CONTINUOUS PREPARATION OF RUBBER-MODIFIED POLYMERS OF VINYLAROMATICS
    5.
    发明专利
    PROCESS FOR THE CONTINUOUS PREPARATION OF RUBBER-MODIFIED POLYMERS OF VINYLAROMATICS 未知

    公开(公告)号：CA1170799A

    公开(公告)日：1984-07-10

    申请号：CA380031

    申请日：1981-06-17

    Applicant: BASF AG

    Inventor： ECHTE ADOLF ,  GAUSEPOHL HERMANN ,  HOFMANN HERMANN P ,  MITTNACHT HANS

    IPC: C08F2/38 ,  C08F4/00 ,  C08F212/06 ,  C08F279/02 ,  C08L7/00 ,  C08F279/00 ,  C08F281/00 ,  C08L25/00 ,  C08L45/00 ,  C08L47/00 ,  C08L53/00 ,  C08L25/02 ,  C08L51/06

    Abstract: O.Z. 0050/034517 A process, carried out without a diluent or in solution, in more than 2 reaction zones, for the continuous preparation of rubber-modified polymers of vinylaromatics, wherein a monomeric aromatic vinyl compound and an elastomeric polymer, in an amount of from 3 to 16% by weight based on the monomer, are polymerized, in the absence of a free radical initiator, but in the presence of a mercaptan as a chain transfer agent, at from 80 to 180.degree.C in a first reaction zone, with stirring, up to a maximum monomer conversion, Umax, given by the equation Umax = K - 1 where K is the amount of rubber in % by weight based on monomer, and, in a second reaction zone, polymerization is continued, with stirring, to a conversion of up to about 50% by weight, after which a chain transfer agent is introduced in an amount of from 0.01 to 0.2% by weight, based on vinyl-aromatic monomer, and polymerization is continued, if appropriate in more than one reaction zone, up to a monomer conversion of less than 85% by weight. The polymer is treated in a devolatilization zone to remove vinyl-aromatic monomer and solvent, if any, and these constituents are recycled to the process. The process claimed makes it possible to prepare products which exhibit good gloss coupled with good mechanical properties, and which can be employed for conventional applications.

    GRAFTED STYRENE-ACRYLIC POLYMERS
    6.
    发明专利
    GRAFTED STYRENE-ACRYLIC POLYMERS 未知

    公开(公告)号：AU532316B2

    公开(公告)日：1983-09-22

    申请号：AU6452680

    申请日：1980-11-19

    Applicant: BASF AG

    Inventor： ECHTE ADOLF ,  GAUSEPOHL HERMANN ,  JENNE HELMUT ,  MITTNACHT HANS

    IPC: C08F212/06 ,  C08F255/06 ,  C08F279/02 ,  C08F279/06

    Abstract: Thermoplastic molding materials which contain a copolymer which has been made impact-resistant with a rubber. The copolymer is produced by polymerizing a mixture of a monovinyl-aromatic compound and an acrylic acid derivative or methacrylic acid derivative in the presence of a rubber. The folding materials contain a specific proportion of soft component. The diameter of the particles of the soft component, and the swelling index of the soft component, lie within a specific range, and the tensile strength of the molding material is higher than the yield strength.

    PREPARATION OF BRANCHED BLOCK COPOLYMERS
    7.
    发明专利
    PREPARATION OF BRANCHED BLOCK COPOLYMERS 未知

    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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