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    PREPARATION OF AN AQUEOUS DISPERSION OF OCCLUDED POLYMER PARTICLES
    6.
    发明申请
    PREPARATION OF AN AQUEOUS DISPERSION OF OCCLUDED POLYMER PARTICLES 审中-公开

    公开(公告)号：WO2021126454A1

    公开(公告)日：2021-06-24

    申请号：PCT/US2020/061230

    申请日：2020-11-19

    Applicant: DOW GLOBAL TECHNOLOGIES LLC ,  ROHM AND HAAS COMPANY

    Inventor： BOHLING, James C. ,  GIMBAL, Justin ,  ROBERTSON, Ian D.

    IPC: C08F20/12 ,  C08F220/18 ,  C08F265/06 ,  C09D151/00 ,  C08F2/38 ,  C08F2/001 ,  C08F2/30 ,  C08F220/1804 ,  C08F4/40 ,  C09D151/003

    Abstract: The present invention relates to a process for preparing an aqueous dispersion of multiphase occluded polymer particles comprising the steps of a) contacting, under emulsion polymerization conditions, first monomers and a chain transfer agent to form an aqueous dispersion of first polymer particles having a Tg in the range of from -30 ºC to 30 ºC; then b) contacting the aqueous dispersion of first polymer particles with a second monomer under emulsion polymerization conditions to form an aqueous dispersion of second polymer particles occluded within the first polymer particles, wherein the first monomers a phosphorus acid monomer or a salt thereof; and the second monomer comprises at least 90 weight percent methyl methacrylate. The aqueous dispersion of occluded polymer particles arising from the process of the present invention is useful in a formulation that can be used to prepare a water-resistant blister free LASD coating.

    AQUEOUS POLYMER DISPERSION OF VOIDED POLYMER PARTICLES
    7.
    发明申请
    AQUEOUS POLYMER DISPERSION OF VOIDED POLYMER PARTICLES 审中-公开

    公开(公告)号：WO2022207783A1

    公开(公告)日：2022-10-06

    申请号：PCT/EP2022/058553

    申请日：2022-03-31

    Applicant: BASF SE

    Inventor： ROSCHMANN, Konrad

    IPC: C08F285/00 ,  C09D151/00 ,  C09D151/003

    Abstract: The present invention relates to aqueous polymer dispersion of voided polymer particles and to a process for preparing such aqueous polymer dispersions. The present invention also relates to polymer particles, in particular powders of said polymer particles, which are obtained by drying a polymer dispersion. Further aspects of the present invention relate to the use of such voided polymer particles and the polymer dispersions as opacifiers and to paints containing such aqueous polymer dispersions. The voided polymer particles comprise: i) an alkali swellable polymer core of polymerized ethylenically unsaturated monomers M(i) comprising polymerized acid monomers M(i.ac) in an amount sufficient for allowing the polymer core to swell at a pH of at least pH 7.5; ii) an intermediate polymer layer of polymerized ethylenically unsaturated monomers M(ii); and iii) a polymer shell of polymerized ethylenically unsaturated monomers M(iii) having a theoretical glass transition temperature according to Fox of at least 60°C. where the monomers M(iii) comprise at least 10% b.w., based on the total weight of the monomers M(iii), of one or more monomers M(iii.a) whose homopolymers have a glass transition temperature of at least 50°C, where the monomer M(iii.a) is selected from the group consisting of C5-C20-cycloalkyl esters of acrylic acid, C5-C20-cycloalkyl esters of methacrylic acid, C5-C20-cycloalkylmethyl esters of acrylic acid, C5-C20-cycloalkylmethyl esters of methacrylic acid, where cycloalkyl in the aforementioned monomers is mono-, bi- or tricyclic and may be unsubstituted or carry 1, 2, 3 or 4 methyl groups; C3-C20-heterocycloalkyl esters of acrylic acid, C3-C20-heterocycloalkyl esters of methacrylic acid, C3-C20-heterocycloalkylmethyl esters of acrylic acid, C3-C20- heterocycloalkylmethyl esters of methacrylic acid, where heterocycloalkyl in the aforementioned monomers has a total of 5 to 16 ring-forming atoms, where 1, 2 or 3 non-adjacent ring-forming atoms are oxygen atoms while the remainder of the ring-forming atoms are carbon atoms, and where heterocycloalkyl is mono-, bi- or tricyclic and may be unsubstituted or carry 1, 2, 3 or 4 methyl groups; di-C1-C2-alkyl esters of itaconic acid; and combinations thereof.

    PROCESS FOR PREPARING AQUEOUS POLYMER DISPERSIONS
    8.
    发明申请
    PROCESS FOR PREPARING AQUEOUS POLYMER DISPERSIONS 审中-公开

    公开(公告)号：WO2021197883A1

    公开(公告)日：2021-10-07

    申请号：PCT/EP2021/057232

    申请日：2021-03-22

    Applicant: COVESTRO (NETHERLANDS) B.V.

    Inventor： SCHEERDER, Jurgen ,  DOLLEKENS, Remy, Paul, Marie

    IPC: C08F2/22 ,  C08F212/08 ,  C08F220/18 ,  C08L33/06 ,  C09D151/00 ,  C08F257/02 ,  C08F265/02 ,  C08F285/00 ,  C09D151/003 ,  C09D5/02

    Abstract: A process for preparing an aqueous polymer dispersion, wherein the process comprising free-radically initiated emulsion polymerization in an aqueous medium, in the presence of at least one vinyl polymer A, to obtain a polymer B comprising a vinyl polymer phase B1 with a glass transition temperature of from -20 to +15 °C and a vinyl polymer phase B2 with a glass transition temperature of from +50 to +110 °C, with the proviso that the difference in glass transition temperature between polymer B1 and polymer B2 is at least 40 °C, wherein the weight ratio of polymer B1 to polymer B2 is from 80:10 to 10:20, wherein the at least one polymer A is obtained by a process comprising: free-radically initiated bulk or solution polymerizing of: from 5 to 25 wt.% of at least one carboxylic acid functional ethylenically unsaturated monomer A1, and from 75 to 95 wt.% of at least one ethylenically unsaturated monomer A2 different than monomer A1, where the amounts are given relative to the total weight of monomers charged in the polymerization to prepare the vinyl polymer A, wherein the weight average molecular weight of the polymer A is lower than the weight average molecular weight of the polymer B, and wherein the weight ratio of polymer A to polymer B is from 10:90 to 40:60.

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