Polyvinyl acetate latex
    12.
    发明授权

    公开(公告)号:US10119018B2

    公开(公告)日:2018-11-06

    申请号:US15338530

    申请日:2016-10-31

    Abstract: The present invention relates to a process for preparing an aqueous dispersion of a vinyl acetate polymer comprising the step of polymerizing vinyl acetate under emulsion polymerization conditions in the presence of a chain transfer agent which is a hypophosphite salt or X—R1—SH, where R1 is a C1-C4 alkyl group and X is sulfonate, hydroxyl, sulfate, phosphate, phosphonate, carboxylic acid or a salt thereof, or C1-C3-alkyl carboxylate. The process provides a way of lowering the viscosity of the vinyl acetate polymer at a given solids content.

    Acrylic Latex Binder and Method of Preparation
    19.
    发明申请
    Acrylic Latex Binder and Method of Preparation 有权
    丙烯酸胶粘剂及其制备方法

    公开(公告)号:US20140221560A1

    公开(公告)日:2014-08-07

    申请号:US14169504

    申请日:2014-01-31

    Abstract: The present invention relates to a process comprising contacting methyl methacrylate or styrene; a C1-C10-alkyl acrylate; and a polymerizable carboxylic acid monomer with a stable aqueous dispersion of first polymer particles, under emulsion polymerization conditions, to form a stable aqueous dispersion of second polymer particles. The first polymer particles have a Tg in the range of from −30° C. to 30° C., and the monomers have a calculated Tg in the range of 50° C. to 120° C. The present invention also relates to the dispersion of second polymer particles, which is useful as a binder to improve freeze-thaw stability in a coatings formulation.

    Abstract translation: 本发明涉及一种使甲基丙烯酸甲酯或苯乙烯接触的方法; 丙烯酸C1-C10烷基酯; 和具有稳定的第一聚合物颗粒的水分散体的可聚合羧酸单体,在乳液聚合条件下,形成稳定的第二聚合物颗粒的水分散体。 第一聚合物颗粒的Tg在-30℃至30℃的范围内,单体的计算Tg在50℃至120℃的范围内。本发明还涉及 第二聚合物颗粒的分散体,其可用作粘合剂以改善涂料配方中的冻融稳定性。

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