22.
    发明专利
    未知

    公开(公告)号:DE3502944A1

    公开(公告)日:1986-07-31

    申请号:DE3502944

    申请日:1985-01-30

    Applicant: BASF AG

    Abstract: Binders for aqueous primers for wood paints contain (A) from 50 to 95% by weight, based on the weight of the primer, of an aqueous dispersion of a vinyl polymer having a particle size of from 0.03 to 0.5 mu m and a minimum film-forming temperature of from 0 DEG to 50 DEG C., the said dispersion being stable to polyvalent ions, and (B) from 5 to 50% by weight, based on the weight of the primer, of a water-soluble polymeric zinc amine complex of a copolymer which has a K value of from 8 to 40 and consists of (a) from 20 to 60% by weight, based on the weight of the copolymer, of an alpha , beta -monoethylenically unsaturated mono- and/or dicarboxylic acid of 3 to 5 carbon atoms and (b) from 40 to 80% by weight, based on the weight of the copolymer, of styrene and/or one or more alkyl (meth)acrylates, where alkyl is of 1 to 8 carbon atoms, the copolymer being reacted with from 2 to 6 moles, based on the carboxyl groups of the copolymer, of ammonia and from 0.8 to 1.2 equivalents of a zinc compound per carboxyl group of the copolymer.

    Production of aqueous polymer dispersion for adhesives, binders etc.

    公开(公告)号:DE19724915A1

    公开(公告)日:1998-12-17

    申请号:DE19724915

    申请日:1997-06-12

    Applicant: BASF AG

    Abstract: Production of aqueous polymer dispersions (I) comprises radical-initiated aqueous emulsion polymerisation of ethylenic monomers to give a dispersion of polymer (A) followed by radical polymerisation of other monomers in one or more subsequent stages (i) in the presence of polymer (A), with the following features: (a) polymer (A) has a Tg of Tg1, (b) the monomers polymerised in stages (i) are such that the isolated statistical (co)polymerisation of these monomers gives a polymer (i) with a Tg which approaches a limiting value of Tgi with increasing molecular weight, (c) for each Tg1 the difference Tgi - Tg1 = at least 10 deg C, (d) the amount of monomers polymerised in polymer (A) is 85-99.9 wt.% of the total amount (TM) polymerised in the entire process, (e) the total amount of monomers polymerised in all stages (i) is 0.1-15 wt.% of TM, (f) in each stage (i), the addition of monomer is carried out so that monomer conversion (polymerisation) (Ui) does not exceed 50 mol% of the amount already in the reactor at any time up to the end of addition, and (g) apart from monomers with two conjugated double bonds, the total amount of monomer used for the production of polymer (A) includes not more than 5 wt.% monomers with more than one unsaturated group. Also claimed are (1) dispersions (I) obtained by this process, (2) polymer powder obtained by spray drying (I), (3) polymers obtained by this process and (4) aqueous dispersions containing such polymers.

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