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    184.
    发明专利
    未知

    公开(公告)号：FI883504A

    公开(公告)日：1989-01-26

    申请号：FI883504

    申请日：1988-07-25

    Applicant: BASF AG

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

    IPC: D21H17/34 ,  D21H17/28 ,  D21H17/45 ,  D21H21/18 ,  D21H

    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.

    PREPARATION OF COPOLYMERS OF MONOETHYENICALLY UNSATURATED MONOCARBOXYLIC ACIDS AND DICARBOXYLIC ACIDS
    186.
    发明专利
    PREPARATION OF COPOLYMERS OF MONOETHYENICALLY UNSATURATED MONOCARBOXYLIC ACIDS AND DICARBOXYLIC ACIDS 未知

    公开(公告)号：CA1243446A

    公开(公告)日：1988-10-18

    申请号：CA412285

    申请日：1982-09-27

    Applicant: BASF AG

    Inventor： DENZINGER WALTER ,  HARTMANN HEINRICH ,  TRIESELT WOLFGANG ,  HETTCHE ALBERT ,  SCHNEIDER ROLF ,  RAUBENHEIMER HANS-JUERGEN

    IPC: C08F220/04 ,  C08F222/02

    Abstract: In a process for the preparation of copolymers which contain monoethylenically unsaturated monocarboxylic acids and dicarboxylic acids as copolymerized monomer units, by copolymerizing the monocarboxylic acids with the dicarboxylic acids or, where appropriate, their inner anhydrides, in an aqueous medium in the presence of a water-soluble initiator, the improvement that a) from 10 to 60% by weight, based on the sum of the monomers, of a monoethylenically unsaturated dicarboxylic acid of 4 to 6 carbon atoms, its alkali metal salt or, where appropriate, its anhydride, b) from 90 to 40% by weight of a monoethylenically unsaturated monocarboxylic acid of 3 to 10 carbon atoms or its alkali metal salt and c) from 0 to 20% by weight of another monoethylenically unsaturated monomer, which is free from carboxyl groups and is copolymerizable with a) and b) are copolymerized in an aqueous medium in the presence of from 0.5 to 5% by weight, based on monomers, of the watersoluble initiator by introducing the dicarboxylic acid, its salt or its anhydride into the aqueous medium, adding the monocarboxylic acid together with the initiator over from 3 to 10 hours, completing the reaction at 60 - 150.degree.C and, where appropriate, hydrolyzing the anhydride groups.

    PREPARATION OF PULVERULENT POLYMERS AND THEIR USE
    187.
    发明专利
    PREPARATION OF PULVERULENT POLYMERS AND THEIR USE 未知

    公开(公告)号：CA1241497A

    公开(公告)日：1988-08-30

    申请号：CA442498

    申请日：1983-12-02

    Applicant: BASF AG

    Inventor： HENNIG KARL ,  MESSMER KARLHEINZ ,  HARTMANN HEINRICH

    IPC: C08F2/38 ,  C08F20/06 ,  C11D3/37 ,  D21H19/58

    Abstract: Pulverulent polymers based on water-soluble ethylenically unsaturated monomers are prepared by polymerizing monomers, which contain acidic groups and are dissolved in water or a water/isopropanol mixture, in a powder bed in the presence of a conventional polymerization initiator while maintaining the powder state, conducting away the heat of polymerization by distilling off the solvent and circulating the reaction mixture, by a process in which from 40 to 95% of the acidic groups of the monomers are neutralized and the polymerization is carried out in the presence of from 3 to 10 mole%, based on the monomers, of a thiocarboxylic acid, of a metal salt or chelate, of an enol-ether or of Z-mercaptoethanol as a regulator. The homopolymers and copolymers thus obtained are used as milling assistants and dispersants for pigments and as encrustation inhibitors and antiredeposition agents for detergents.

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