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    PROCESS FOR PRODUCING AN AQUEOUS POLYMER DISPERSION
    1.
    发明申请
    PROCESS FOR PRODUCING AN AQUEOUS POLYMER DISPERSION 审中-公开

    公开(公告)号：WO2021018767A1

    公开(公告)日：2021-02-04

    申请号：PCT/EP2020/070942

    申请日：2020-07-24

    Applicant: BASF SE

    Inventor： MOLLAT DU JOURDIN, Xavier ,  LESWIN, Joost ,  REINSCH, Michaela ,  SPECHT, Nicole ,  EINHORN-RECH, Janine ,  DIMMER, Joerg Alexander ,  PACHE, Rainer ,  GATTERMAYER, Jochen ,  DENU, Hans-Juergen

    IPC: C08F2/22 ,  C08F2/38 ,  C08L33/04 ,  C08L33/06 ,  C09D5/00 ,  C09D133/00

    Abstract: The present application relates to a process for producing an aqueous polymer dispersion of polymerized ethylenically unsaturated monomers M by a multistage aqueous radical emulsion polymerization comprising a first aqueous radical emulsion polymerization step of a first monomer composition M.a and subsequently a further aqueous radical emulsion polymerization step of a second monomer composition M.b. The present application also relates to aqueous polymer dispersions obtainable by such a process and to the use thereof, in particular as a binder in coating compositions. The process comprises a multistage aqueous radical emulsion polymerization of ethylenically unsaturated monomers M, comprising a) at least one non-ionic, monoethylenically unsaturated monomer M1 having a solubility in deionized water of at most 60 g/L at 25°C and 1 bar, b) at least one monoethylenically unsaturated monomer M2 selected from monomers having an acid group and their salts, and c) optionally one or more ethylenically unsaturated monomers M3, which are different from the monomers M1 and M2, where the process comprises i) a first step of an aqueous radical emulsion polymerization of a first monomer composition M.a consisting of monomers M1, M2 and optionally M3, to obtain a first aqueous polymer dispersion, where the monomer composition M.a comprises at most 2% by weight, in particular at most 1.5% by weight and especially at most 1.5% by weight or at most 1.0% by weight, based on the total weight of the monomers of the monomer composition M.a, of monomers M2, and subsequently ii) at least one further aqueous radical emulsion polymerization step of a second monomer composition M.b consisting of monomers M1, M2 and optionally M3, where the second step is performed in the aqueous polymer dispersion of the first step and in the presence of a chain transfer agent T, where the monomer composition M.b comprises 2 to 20% by weight, in particular from 5 to 18% by weight and especially from 8 to 16% by weight, based on the total weight of the monomers of the monomer composition M.b, of at least one monomer M2, where the weight ratio of the total weight of monomers of monomer composition M.a to the total weight of monomers of monomer composition M.b is in the range from 10:90 to 90:10, in particular in the range from 50:50 to 87:13, especially in the range from 60:40 to 85:15.

    AQUEOUS POLYMER DISPERSIONS
    2.
    发明申请
    AQUEOUS POLYMER DISPERSIONS 审中-公开

    公开(公告)号：WO2021209543A1

    公开(公告)日：2021-10-21

    申请号：PCT/EP2021/059767

    申请日：2021-04-15

    Applicant: BASF SE

    Inventor： WOLF, Thomas ,  DENU, Hans-Juergen ,  DIMMER, Joerg Alexander ,  WILLERICH, Immanuel ,  MOLLAT DU JOURDIN, Xavier

    IPC: C08F265/06 ,  C04B41/00 ,  C09D151/00

    Abstract: The present invention relates to aqueous polymer dispersions, which are obtainable by a free radical aqueous emulsion polymerization of ethylenically unsaturated monomers M, which comprise a) 0.5 to 7.0% by weight, based on the total weight of monomers M, of a combination of a1 ) at least one monomer Ma1, selected from monoethylenically unsaturated monocarboxylic acids having 3 to 6 carbon atoms and the salts thereof; a2) at least one monomer Ma2, selected from monoethylenically unsaturated dicarboxylic acids having 4 to 8 carbon atoms and the salts thereof; a3) at least one monomer Ma3, selected from monoethylenically unsaturated monosulfonic acids having 2 to 10 carbon atoms and the salts thereof; b1) 60 to 79.45% by weight, based on the total weight of monomers M, of at least one monomer Mb1, which is selected from nonionic monoethylenically unsaturated monomers having a solubility in deionized water of at most 60 g/L at 25°C and 1 bar, and whose homopolymers have a glass transition temperature Tg of at least 50°C; b2) 20 to 39.45% by weight, based on the total weight of monomers M, of at least one monomer Mb2, which is selected from nonionic monoethylenically unsaturated monomers having a solubility in deionized water of at most 60 g/L at 25°C and 1 bar, and whose homopolymers have a glass transition temperature Tg of at most 40°C; c) 0.05 to 2.0% by weight of at least one crosslinking monomer Mc; where the aqueous emulsion polymerization is carried out at least partly in the presence of a chain transfer compound. The invention also relates to a process for producing the aqueous polymer dispersions. The aqueous polymer dispersions are useful as binders in water-borne coating formulations, in particular as binder in water-borne coating formulations for shaped mineral articles.

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