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    4.
    发明专利
    未知

    公开(公告)号：DE2539102A1

    公开(公告)日：1977-03-17

    申请号：DE2539102

    申请日：1975-09-03

    Applicant: BASF AG

    Inventor： REFFERT RUDI WILHELM ING GRAD ,  WILD HANS DIPL CHEM DR ,  THIELEN GUNTER DIPL ING DR ,  ZIZLSPERGER JOHANN DIPL CHEM D ,  JECKEL GUENTER ,  ECHTE ADOLF DIPL CHEM DR

    IPC: C08F6/00 ,  B29C47/10 ,  B29C48/76 ,  C08G85/00 ,  B29F3/03

    Abstract: Elimination is effected from a molten mass, soln. or dispersion by introducing the preheated material into the base part of a horizontal extruder under a pressure corresp., at the preheating temp., at least to the satn. pressure of the volatiles. The material is heated as it advanced through the extruder so that evapn. of the volatiles begins as the material enters the extruder, the major part of the volatiles leaving the extruder through an orifice situated vertically above the inlet orifice. The treated material is then extruded. Very rapid and efficient elimination of volatiles is obtd. The process is capable of treating the plastic materials at high flow rates. Material having a very low volatiles content, e.g. 0.1 wt. %, can be obtd.

    INCORPORATING RUBBER INTO THERMOPLASTICS
    5.
    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.

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