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    31.
    发明专利
    未知

    公开(公告)号：DE4007312A1

    公开(公告)日：1991-09-12

    申请号：DE4007312

    申请日：1990-03-08

    Applicant: BASF AG

    Inventor： MOENCH DIETMAR DR ,  KROENER MICHAEL DR ,  FREUDENBERG ENRIQUE DR ,  HARTMANN HEINRICH DR ,  SENDHOFF NORBERT DR

    IPC: C08F2/10 ,  C08F8/12 ,  C08F26/00 ,  C08F26/02

    Abstract: N-vinylformamide is polymerized with or without other water-soluble monoethylenically unsaturated monomers and with or without water-insoluble monoethylenically unsaturated monomers in not less than 30% strength by weight aqueous monomer solutions in the presence of a polymerization initiator at not more than 150 degrees C. in a kneader by a method in which the polymerization is carried out to such an extent that the initially formed water-containing polymer gel disintegrates into fine particles and the finely divided polymer obtainable in this manner is hydrolyzed, preferably in the kneader, so that not less than 0.1 mol % of the N-vinylformamide units present in the polymer are converted into vinylamine units. The polymers obtainable in this manner dissolve readily in water. The aqueous solutions are used, for example, in papermaking and tertiary oil production.

    36.
    发明专利
    未知

    公开(公告)号：DE3724646A1

    公开(公告)日：1989-02-02

    申请号：DE3724646

    申请日：1987-07-25

    Applicant: BASF AG

    Inventor： STANGE ANDREAS DR ,  DEGEN HANS-JUERGEN DR ,  AUHORN WERNER ,  WEBERNDOERFER VOLKMAR DR ,  KROENER MICHAEL DR ,  HARTMANN HEINRICH DR

    IPC: D21H17/34 ,  D21H17/28 ,  D21H17/45 ,  D21H21/18

    Abstract: In the process, an agent which confers dry strength and can be obtained by mixing enzymatically degraded starch having a viscosity of 20 to 2,000 m Pa.s (determined on a 7.5% strength solution in water at 45 DEG C) with cationic polymers which contain, in copolymerised form,… a) diallyldimethylammonium chloride… b) N-vinylamine or… c) optionally substituted N-vinylimidazolines as characteristic monomers, the K-value of the cationic polymers being at least 30, is added to the paper stock and the stock is dewartered, during sheet formation.

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