Production and recovery of a solid mixed homo- and copolymer
    5.
    发明授权
    Production and recovery of a solid mixed homo- and copolymer 失效
    固体混合的共聚物的生产和回收

    公开(公告)号:US3644583A

    公开(公告)日:1972-02-22

    申请号:US3644583D

    申请日:1969-04-23

    Inventor: SCOGGIN JACK S

    CPC classification number: C08F210/00

    Abstract: A SOLID MIXED HOMO- AND COPOLYMER PRODUCT IS PRODUCED BY A COMINATION OF A CATALYZED MASS HOMOAND A CATALYZED MASS COPOLYMERIZATION AND THE SOLID RECOVERED AND WASHED WITH AN IMPURE FRACTION OF THE MONOMERS SO REACTED, THE FRACTION BEING OBTAINED BY A FRACTINATION OF UNREACTED EXCESS MONOMERS TO PRODUCE A STREAM CONTAINING CATALYST AND ANY SOLUBLE POLYMER, A STREAM CONTAINING A MIXTURE OF THE MONOMERS, USING A PORTION OF THE STREAM OF MONOMERS AS SAID IMPURE FRACTION, FRACTIONATING ANOTHER PORTION THEREOF TO OBTAIN ONE OF THE MONOMERS FOR THE HOMOPOLYMERIZATION AND A MIXTURE OF THE MONOMERS FOR SAID COPOLYMERIZATION. IN AN EMBODIMENT A MIXED POLYPROPYLENE-PROPYLENE-ETHYLENE COPOLYMER IS PRODUCED AND RECOVERED AND WASHED WITH A STREAM CONTAINING PROPYLENE AND ETHYLENE, THERE BEING RECOVERED ALSO A STREAM OF PROPYLENE SUBSTANTIALLY FREE FROM ETHYLENE FOR USE IN SAID HOMOPOLYMERIZATION AND A STREAM CONTAINING PROPYLENE AND ETHYLENE FOR USE IN SAID COPOLYMERIZATION.

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