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    Aqueous dispersion of multistage polymer particles
    2.
    发明授权
    Aqueous dispersion of multistage polymer particles 有权

    公开(公告)号：US11186741B2

    公开(公告)日：2021-11-30

    申请号：US16556572

    申请日：2019-08-30

    Applicant: Rohm and Haas Company

    Inventor： James K. Bardman ,  David G. Kelly ,  Michael W. Leonard

    IPC: C09D133/06 ,  C09D7/40

    Abstract: The present invention relates to a composition comprising an aqueous dispersion of multistage polymer particles comprising a first and a second phase, wherein the first phase comprises structural units of a carboxylic acid monomer or a salt thereof, and a nonionic ethylenically unsaturated monomer; and wherein the second phase comprises a first and second polymer, wherein the first phase or the second phase first polymer or both comprise structural units of a high Tg hydrophobic monomer; and wherein the second phase second polymer comprises at least 80 percent structural units of styrene. The high Tg hydrophobic monomer is defined as being one or more of the following monomers: cyclohexyl methacrylate, isobornyl methacrylate, 4-t-butyl methacrylate, t-butylstyrene, or n-butyl methacrylate. The multistage polymer particles are useful as opaque polymers, which are used in pigmented coating formulations to reduce the load of TiO2. The particles exhibit excellent collapse resistance and unusually low dry bulk density, and do not require acrylonitrile to achieve this desired combination of properties.

    PREPARATION OF A COATINGS FORMULATION WITH ALKALI SWELLABLE POLYMER PARTICLES
    3.
    发明申请
    PREPARATION OF A COATINGS FORMULATION WITH ALKALI SWELLABLE POLYMER PARTICLES 审中-公开

    公开(公告)号：US20200299527A1

    公开(公告)日：2020-09-24

    申请号：US16607257

    申请日：2018-05-02

    Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

    Inventor： James K. Bardman ,  Jonathan DeRocher ,  Andrew Hejl ,  Antony K. Van Dyk ,  Lin Wang ,  Kimy Yeung

    IPC: C09D7/65 ,  C09D7/40 ,  C08F220/06 ,  C08F220/18 ,  C08F220/14 ,  C08F212/08 ,  C08F2/22 ,  C08L25/14 ,  C08K3/22

    Abstract: The present invention relates to a process for preparing a coatings composition with an open time additive comprising the steps of a) contacting an aqueous dispersion of alkali swellable polymer particles with a rheology modifier and a binder to form a coatings composition with a VOC of less than 50 g/L; and b) neutralizing the alkali swellable particles with a non-volatile base after or upon contact with the rheology modifier and the binder to form swelled multi-staged polymer particles; wherein the alkali swellable polymer particles comprise a shell having a Tg of not greater than 25° C. and an acid functionalized core; and wherein the core-to-shell ratio is in the range of from 1:3.2 to 1:10. The composition arising from the process of the present invention is useful for improving open time, especially for low VOC coatings applications.In another aspect the present invention relates to the preparation of the coatings composition with an open time additive comprising the steps of a) contacting the open time additive with a rheology modifier and a binder to form a coatings composition with a VOC of less than 50 g/L, then b) neutralizing the open time additive to form swelled multi-staged polymer particles, wherein the coatings composition with the open time additive exhibits less than a 50% increase in viscosity than the coating composition without the open time additive.

    Method for preparing an aqueous dispersion of multistage polymer particles
    5.
    发明授权
    Method for preparing an aqueous dispersion of multistage polymer particles 有权

    公开(公告)号：US10919999B2

    公开(公告)日：2021-02-16

    申请号：US16556607

    申请日：2019-08-30

    Applicant: Rohm and Haas Company

    Inventor： James K. Bardman ,  David G. Kelly ,  Michael W. Leonard

    IPC: C08F220/18 ,  C08F2/22 ,  C08F220/14 ,  C08F20/56 ,  C08K3/22 ,  C08F6/02 ,  C08F20/70

    Abstract: The present invention relates to a method of preparing an aqueous dispersion of multistage polymer particles comprising contacting under emulsion polymerization conditions and in a staged fashion an aqueous dispersion of carboxylic acid functionalized core polymer particles with first monomers and second monomers. The core comprises structural units of a high Tg hydrophobic monomer and/or the first monomers comprise a high Tg hydrophobic monomer, and the second monomers comprise at least 80 percent styrene. The high Tg hydrophobic monomer is cyclohexyl methacrylate, isobornyl methacrylate, 4-t-butyl methacrylate, t-butylstyrene, or n-butyl methacrylate, or a combination thereof. The multistage polymer particles are useful as opaque polymers, which are used in pigmented coating formulations to reduce the load of TiO2. The particles exhibit excellent collapse resistance and unusually low dry bulk density, and do not require acrylonitrile to achieve this desired combination of properties.

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

    公开(公告)号：US20200071558A1

    公开(公告)日：2020-03-05

    申请号：US16556572

    申请日：2019-08-30

    Applicant: Rohm and Haas Company

    Inventor： James K. Bardman ,  David G. Kelly ,  Michael W. Leonard

    IPC: C09D133/06 ,  C09D7/40

    Abstract: The present invention relates to a composition comprising an aqueous dispersion of multistage polymer particles comprising a first and a second phase, wherein the first phase comprises structural units of a carboxylic acid monomer or a salt thereof, and a nonionic ethylenically unsaturated monomer; and wherein the second phase comprises a first and second polymer, wherein the first phase or the second phase first polymer or both comprise structural units of a high Tg hydrophobic monomer; and wherein the second phase second polymer comprises at least 80 percent structural units of styrene. The high Tg hydrophobic monomer is defined as being one or more of the following monomers: cyclohexyl methacrylate, isobornyl methacrylate, 4-t-butyl methacrylate, t-butylstyrene, or n-butyl methacrylate. The multistage polymer particles are useful as opaque polymers, which are used in pigmented coating formulations to reduce the load of TiO2. The particles exhibit excellent collapse resistance and unusually low dry bulk density, and do not require acrylonitrile to achieve this desired combination of properties.

    METHOD FOR PREPARING AN AQUEOUS DISPERSION OF MULTISTAGE POLYMER PARTICLES
    8.
    发明申请
    METHOD FOR PREPARING AN AQUEOUS DISPERSION OF MULTISTAGE POLYMER PARTICLES 审中-公开

    公开(公告)号：US20200071439A1

    公开(公告)日：2020-03-05

    申请号：US16556607

    申请日：2019-08-30

    Applicant: Rohm and Haas Company

    Inventor： James K. Bardman ,  David G. Kelly ,  Michael W. Leonard

    IPC: C08F220/18 ,  C08F2/22 ,  C08F220/14 ,  C08F20/70 ,  C08F20/56 ,  C08K3/22 ,  C08F6/02

    Abstract: The present invention relates to a method of preparing an aqueous dispersion of multistage polymer particles comprising contacting under emulsion polymerization conditions and in a staged fashion an aqueous dispersion of carboxylic acid functionalized core polymer particles with first monomers and second monomers. The core comprises structural units of a high Tg hydrophobic monomer and/or the first monomers comprise a high Tg hydrophobic monomer, and the second monomers comprise at least 80 percent styrene. The high Tg hydrophobic monomer is cyclohexyl methacrylate, isobornyl methacrylate, 4-t-butyl methacrylate, t-butylstyrene, or n-butyl methacrylate, or a combination thereof. The multistage polymer particles are useful as opaque polymers, which are used in pigmented coating formulations to reduce the load of TiO2. The particles exhibit excellent collapse resistance and unusually low dry bulk density, and do not require acrylonitrile to achieve this desired combination of properties.

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