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    Graft copolymer products and method of making same
    1.
    发明授权
    Graft copolymer products and method of making same 失效
    聚酯共聚物产品及其制备方法

    公开(公告)号：US3624183A

    公开(公告)日：1971-11-30

    申请号：US3624183D

    申请日：1966-01-27

    Applicant: US RUBBER CO

    Inventor： LEACH BENTON R ,  MURRAY ALLAN G

    IPC: C08F279/04 ,  C08F19/08

    CPC classification number: C08F279/04 ,  Y10S525/942 ,  C08F2/22

    Abstract: A graft copolymer is prepared by polymerizing monomeric styrene and acrylonitrile in a latex of a synthetic rubbery copolymer of about 90 parts of butadiene and 10 parts of styrene having at least 80 percent gel content. The average particle diameter of the latex is 2,000 to 5,000 angstrom units. From 40 to 55 parts of the monomers are used with correspondingly from 60 to 45 parts of the synthetic rubber. The polymerization is carried at 120*175* F. to a conversion of at least 85 percent of the styrene and acrylonitrile to copolymer. The anionic surface-active emulsifier level during the grafting is maintained at not over 5 parts per 100 parts of rubber and styrene-acrylonitrile copolymer that has been polymerized in the latex until at least 75 percent of the styrene and acrylonitrile monomer mixture to be polymerized in admixture with the synthetic rubber has been converted to polymer. Preferably the rubber latex is prepared by at 100*-170* F. in the presence of 0.1-0.3 part of alkalimetal soap per 100 parts of butadiene and sytrene until 20-50 percent conversion, 1.5-2.3 parts of such soap being added during further conversion. The resulting graft copolymer can be blended, preferably by latex blending, with a separately prepared copolymer resin of 6080 parts of styrene and/or alpha-methyl styrene and correspondingly 40-20 parts of acrylonitrile. Articles formed from the disclosed graft copolymer compositions are characterized by high surface gloss.

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