AQUEOUS DISPERSION OF OCCLUDED POLYMER PARTICLES

    公开(公告)号:US20230058018A1

    公开(公告)日:2023-02-23

    申请号:US17784345

    申请日:2020-11-19

    IPC分类号: C08L33/08 C09D133/08

    摘要: The present invention relates to a composition comprising an aqueous dispersion of multiphase polymer particles comprising first polymer particles having a Tg of less than 30° C. and second polymer particles having a Tg in the range of from 100° C. to 110° C., wherein the second polymer particles are phase separated from and occluded within the first polymer particles; wherein the number average molecular weight (Mn) of the multiphase polymer particles is in the range of from 9,000 to 25,000 g/mole; and wherein the second polymer particles comprise at least 95 weight percent methyl methacrylate. The composition of the present invention is useful in a formulation that can be used to prepare a water-resistant blister free LASD coating with little or no surface defects.

    PREPARATION OF AN AQUEOUS DISPERSION OF OCCLUDED POLYMER PARTICLES

    公开(公告)号:US20230052817A1

    公开(公告)日:2023-02-16

    申请号:US17785072

    申请日:2020-11-19

    摘要: 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° C. to 30° C.; 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.