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    INCORPORATING RUBBER INTO THERMOPLASTICS
    1.
    发明专利
    INCORPORATING RUBBER INTO THERMOPLASTICS 未知

    公开(公告)号：CA942446A

    公开(公告)日：1974-02-19

    申请号：CA118903

    申请日：1971-07-22

    Applicant: BASF AG

    Inventor： LABER WALTER ,  GOTTSCHALK ALFRED ,  SCHWAAB JOSEF ,  JECKEL GUENTER ,  MOSTHAF HELMUT

    IPC: B29B7/00 ,  C08J3/00 ,  C08C9/14

    Abstract: 1348286 Incorporating grafted rubbers into thermoplastics material BADISCHE ANILIN- & SODA-FABRIK AG 29 July 1971 [30 July 1970] 35617/71 Heading C3G A process for incorporating rubber into a thermoplastics material comprises precipitating a rubber latex, freeing the rubber mechanically of 10-98% of its initial water content so that the resulting rubber contains 2-50% by weight water, mixing the said rubber with the thermoplastics material at a temperature which is above the softening point of the thermoplastics materials, and removing the remainder of water during or after the incorporation. The thermoplastics material may be a homopolymer or copolymer of styrene, vinyl chloride or methyl methacrylate. Numerous rubbers are specified but it is preferred to use graft copolymers in which monomers forming rigid polymers are polymerized in aqueous emulsion on to a rubber base. The finished plastics material advantageously contains 5-60%, preferably 10-50%, by weight of the rubber worked into 95-40%, preferably 90-50%, by weight of thermoplastics material. The initial water removal may be carried out by filtration, pressing or centrifugation. Incorporation of the rubber into the thermoplastics material may be carried out in conventional mixing equipment, advantageously extruders or kneaders. The thermoplastics may be introduced into the mixing equipment as a melt. Alternatively it is possible to start from a dispersion of the thermoplastics material, to precipitate and partly dehydrate the same, and then to work it into the moist rubber. When an extruder is used it is advantageous to meter in the moist rubber first since this may be carried out under mild conditions without using superatmospheric conditions. After the thermoplastics material and rubber have passed through together the two components are mixed homogeneously together, at a temperature above the softening point of the thermoplastics material. The remaining water is removed by counterpressure or evaporation. In the example a styrene/acrylonitrile (70:30) copolymer is incorporated into a rubber latex produced by emulsion graft polymerization of 50 parts by weight of a mixture of styrene and acrylonitrile (70 : 30) in the presence of 100 parts by weight of a butadiene/butyl acrylate (40 : 60) copolymer.

    Process and apparatus for the continuous homogeneous incorporation into plastic melts of substances to be finely dispersed therein
    2.
    发明专利
    Process and apparatus for the continuous homogeneous incorporation into plastic melts of substances to be finely dispersed therein 未知

    公开(公告)号：GB927989A

    公开(公告)日：1963-06-06

    申请号：GB646562

    申请日：1962-02-20

    Applicant: BASF AG

    Inventor： MOSTHAF HELMUT ,  BRONSTERT KLAUS ,  BOECK EDMUND ,  UFER KLAUS

    IPC: B29B7/00 ,  B29B7/42 ,  B29C47/10 ,  B29C48/395 ,  B29C48/67 ,  B29C48/76 ,  C08J3/22 ,  C09B67/20

    Abstract: 927,989. Extruding plastic materials. BADISCHE ANILIN- & SODAFABRIK A.G. Feb. 20, 1962 [Feb. 23, 1961], No. 6465/62. Class 87(2). In a process for the continuous homogeneous incorporation of substances, such as colouring matter or stabilizers, which are to be finely dispersed in melts of plastics by premixing a small portion of the powdered or granular plastic with the substance to be finely dispersed therein, the mixture is supplied in the cold state to an extruder 1, the mixture being melted in a melting zone and the melt mixed in a mixing zone adjacent to the melting zone in the extruder 1, mixing the resultant melt in a second mixing zone with the bulk of the plastic introduced in a molten condition and discharging the complete mixture thus obtained from the extruder. The extruder 1 houses a worm screw having a rear part 6 in the melting zone and a front part 7 in the second mixing zone. The melting zone is fed from a rear feed hopper 2, and the second mixing zone by a front feed hopper 3. Immediately prior to the front feed hopper 3 is a flow retarding element 8 which has the same external diameter as the screw thread and forms a narrow gap of 0À01 to 0À2 m.m. between its outer surface and the inner surface of the extruder housing.

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