32.
    发明专利
    未知

    公开(公告)号:DE59911207D1

    公开(公告)日:2005-01-05

    申请号:DE59911207

    申请日:1999-10-30

    Applicant: BASF AG

    Abstract: Aqueous dispersions of water-soluble polymers of N-vinylcarboxamides contain, based on 100 parts of water, (A) from 5 to 80 parts by weight of water-soluble polymer containing N-vinylformamide units and/or N-vinylacetamide units and having particle sizes of from 50 nm to 2 mum and (B) from 1 to 50 parts by weight of at least one polymeric dispersant which is incompatible with the water-soluble polymers (A) in aqueous solution, which dispersions are prepared by polymerizing (A) from 5 to 80 parts by weight of N-vinylformamide and/or N-vinylacetamide, if desired together with other monoethylenically unsaturated monomers which form water-soluble polymers therewith, and (B) from 1 to 50 parts by weight of at least one polymeric dispersant which is incompatible with the polymers, formed from the monomers (A), in aqueous solution, in 100 parts by weight of water, at from 30 to 95° C. in the presence of from 0.001 to 5.0% by weight, based on the monomers used, and the aqueous dispersions of water-soluble polymers are used as drainage aids, flocculants and retention aids and as wet and dry strength agents and as fixing compositions in papermaking.

    Preparation of finely divided homo- and co-polymers of N-vinyl formamide

    公开(公告)号:DE19710215A1

    公开(公告)日:1998-09-17

    申请号:DE19710215

    申请日:1997-03-12

    Applicant: BASF AG

    Abstract: The preparation of finely divided homopolymers and copolymers of N-vinyl formamide and optionally vinyl amine unit containing polymers comprises radically polymerising N-vinyl formamide and optionally copolymers in a solution of the monomers and optionally hydrolysing to vinyl amine units. The polymerisation uses an organic solvent in which the monomers are poorly soluble but in which the polymer is soluble and takes place in a kneader or fixed bed reactor.

Patent Agency Ranking