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    MANUFACTURE OF INSOLUBLE AND ONLY SLIGHTLY SWELLABLE POLY-N-VINYLPYRROLIDONE-2
    4.
    发明专利
    MANUFACTURE OF INSOLUBLE AND ONLY SLIGHTLY SWELLABLE POLY-N-VINYLPYRROLIDONE-2 未知

    公开(公告)号：CA946547A

    公开(公告)日：1974-04-30

    申请号：CA129172

    申请日：1971-12-02

    Applicant: BASF AG

    Inventor： HOFMANN ERNST ,  HERRLE KARL

    IPC: C08F20060101 ,  C08F2/10 ,  C08F4/42 ,  C08F126/10 ,  C08F226/10 ,  C12H1/04

    Abstract: 1362044 Poly-N-vinyl pyrrolidone-2 BADISCHE ANILIN- & SODA-FABRIK AG 2 Dec 1971 [3 Dec 1970] 55929/71 Heading C3P] [Also in Division C6] An insoluble and only slightly swellable poly- N-vinyl pyrrolidone-2 is prepared by polymerizing N-vinyl pyrrolidone-2 in aqueous solution in the presence of 0À5 to 10% by weight, based on the N-vinyl pyrrolidone, of a cyclic acid amide containing at least two ethylenically unsaturated groups, one of which is attached to an amide nitrogen atom which forms part of a heterocyclic ring, the polymerization being started at the surface of a metal which is susceptible to attack by oxygen and which is capable of forming a permeable oxide film or by seeds of poly-N-vinyl pyrrolidone-2 formed at the surface of said metal. The metal may be Fe, an Fe alloy, Co, Zn or Sn and may be the reactor. The amide may be N,N 1 - divinylimidazolidone - 2, N,N 1 - divinylhexahydropyrimidinone-2 or N-vinyl-3-ethylidinepyrrolidone-2. In the examples, N-vinylpyrrolidone-2 is polymerized in the presence of N,N 1 - divinylimidazolidone - 2, dibenzoyl peroxide and iron or zinc or seeds are produced by polymerizing N-vinylpyrrolidone-2 in the presence of N,N 1 -divinyl imidazolidone-2 or N,N 1 - divinylhexahydropyrimidone-2 dibenzoyl peroxide and iron and the seeds are used to polymerize N-vinyl pyrrolidone-2 in the presence of N,N 1 -divinyl imidazolidone-2 or N,N 1 -divinylhexahydropyrimidone-2.

    MANUFACTURE OF INSOLUBLE AND ONLY SLIGHTLY WATER-SWELLABLE POLYMERS OF N-VINYL LACTAMS MPROVED ADSORPTIVITY
    5.
    发明专利
    MANUFACTURE OF INSOLUBLE AND ONLY SLIGHTLY WATER-SWELLABLE POLYMERS OF N-VINYL LACTAMS MPROVED ADSORPTIVITY 未知

    公开(公告)号：CA1076288A

    公开(公告)日：1980-04-22

    申请号：CA231427

    申请日：1975-07-11

    Applicant: BASF AG

    Inventor： DENZINGER WALTER ,  HOFMANN ERNST ,  HERRLE KARL

    IPC: A23L2/80 ,  B01J20/22 ,  C08F26/06 ,  C12H1/056 ,  C08F126/06 ,  C12C9/00

    Abstract: The present invention relates to a process for the manufacture of insoluble and only slightly swellable polymers or copolymers of N-vinyl pyrrolidone, N-vinyl caprolactam and N-vinyl pipe idone, in which N-vinyl pyrrolidone or a mixture of N-vinyl pyrrolidone with from 5 to 100% by weight, based on N-vinyl pyrrolidone, of N-vinyl caprolactam or N-vinyl piperidone, is polymerized in dilute aqueous solution at pHs greater than 6 with the exclusion of oxygen and in the presence of a cyclic amide containing at least two ethylenically unsaturated groups, of which at least one is attached to an amide nitrogen atom, and in the presence of from 0.05 to 2% by weight, based on N-vinyl pyrrolidone, of at least one substance selected from the group consisting of ascorbic acid, ethyl acetoacetate and pyruvic acid, said polymerization being carried out at from 50.degree. tv 100.degree.C.

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