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    Residual monomer content of aqueous polymer dispersions is reduced
    2.
    发明专利
    Residual monomer content of aqueous polymer dispersions is reduced 未知

    公开(公告)号：DE19859249A1

    公开(公告)日：1999-06-10

    申请号：DE19859249

    申请日：1998-12-22

    Applicant: BASF AG

    Inventor： HEIBEL CLAUDIA DR ,  KREMESKOETTER JENS DR ,  DOBBELAAR JOHANNES DR

    IPC: C08F6/00 ,  C08F6/10

    Abstract: A process for the reduction in the residual monomer content of aqueous polymer dispersions is carried out by the addition of a radical redox initiator system. A process for the reduction of the non-chemically bound residual content of an aqueous polymer dispersion (I) that contains compounds having ethylenically unsaturated groups (residual monomers), comprises the post treatment of the dispersion (I) with a radical redox initiator system (II). (II) contains (A) an oxidising agent consisting of compounds liberating hydrogen peroxide and compounds of formula (1); and (B) a reducing agent consisting of alpha -hydroxycarboxylic acids containing a hydroxymethine group and corresponding salts. R = H, 1-8C alkyl or 6-12C aryl. The addition of (II) to (I) is such that (i) at least a portion of (B) is added to (I) followed by the simultaneous but spatially separate addition of the remainder of (B) with the total amount of (A); or (ii) at least a portion of (A) is added to (I) followed by the simultaneous but spatially separate addition of the remainder of (A) with the total amount of (B); or (iii) the simultaneous but spatially separate addition of the total amounts of (A) and (B).

    Reducing residual monomer content in aqueous polymer dispersion
    3.
    发明专利
    Reducing residual monomer content in aqueous polymer dispersion 未知

    公开(公告)号：DE19741187A1

    公开(公告)日：1999-03-25

    申请号：DE19741187

    申请日：1997-09-18

    Applicant: BASF AG

    Inventor： RUPANER ROBERT DR ,  BAUER GERHARD DR ,  LAWRENZ SVEN ,  HEIBEL CLAUDIA DR ,  DOBBELAAR JOHANNES DR

    IPC: C08F6/00 ,  C08F6/06

    Abstract: The residual monomer content of aqueous polymer dispersions is reduced by further treatment with an initiator system containing a peroxide, a saturated alpha - hydroxycarboxylic acid and, optionally, multivalent ions of a variable-valency metal. A method for reducing the residual monomer content in aqueous polymer dispersions comprises post-treatment by addition of an initiator system essentially containing: (a) 0.01-5 wt% (based on total amount of monomers used to make the dispersion) of a compound of formula: R -O-O-R (a1), and/or a compound which liberates hydrogen peroxide (H2O2) in aqueous medium (a2); (b) 0.01-30 wt% alpha -hydroxy- carboxylic acid with no polymerisable carbon-carbon double bonds or a salt thereof; and (c) 0-1000 ppm multivalent metal ions of variable valency. R and R = H, 1-8 C alkyl or 6-12 C aryl, at least one of these groups being H;

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