16.
    发明专利
    未知

    公开(公告)号:DE3768588D1

    公开(公告)日:1991-04-18

    申请号:DE3768588

    申请日:1987-08-29

    Applicant: BASF AG

    Abstract: Vinylpyrrolidone is removed from its polymers by a process in which an aqueous or alcoholic solution of the polymer is treated with an adsorbent, the adsorbents used preferably being active carbon, zeolites and especially acidic ion exchangers.

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