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    METHOD FOR PREPARING AN AQUEOUS DISPERSION OF MULTISTAGE POLYMER PARTICLES
    2.
    发明公开
    METHOD FOR PREPARING AN AQUEOUS DISPERSION OF MULTISTAGE POLYMER PARTICLES 审中-公开

    公开(公告)号：EP3620476A1

    公开(公告)日：2020-03-11

    申请号：EP19195252.2

    申请日：2019-09-03

    申请人： Rohm and Haas Company

    发明人： BARDMAN, James K. ,  KELLY, David G. ,  LEONARD, Michael W.

    IPC分类号： C08F285/00 ,  C08F8/44

    摘要： 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 T g hydrophobic monomer and/or the first monomers comprise a high T g hydrophobic monomer, and the second monomers comprise at least 80 percent styrene. The high T g 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 TiO 2 . 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
    6.
    发明公开
    AQUEOUS DISPERSION OF MULTISTAGE POLYMER PARTICLES 审中-公开

    公开(公告)号：EP3620493A1

    公开(公告)日：2020-03-11

    申请号：EP19195251.4

    申请日：2019-09-03

    申请人： Rohm and Haas Company

    发明人： BARDMAN, James K. ,  KELLY, David G. ,  LEONARD, Michael W.

    IPC分类号： C09D5/00 ,  C08F265/00

    摘要： 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 T g hydrophobic monomer; and wherein the second phase second polymer comprises at least 80 percent structural units of styrene. The high T g 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 TiO 2 . The particles exhibit excellent collapse resistance and unusually low dry bulk density, and do not require acrylonitrile to achieve this desired combination of properties.