Foamed coating composition and method for coating a substrate with such coating composition

    公开(公告)号:US10414940B2

    公开(公告)日:2019-09-17

    申请号:US15780702

    申请日:2016-12-07

    Abstract: The invention relates to a method for coating a substrate comprising: a) providing a liquid aqueous coating composition, the composition comprising an acrylic resin as binder, one or more surfactants, a coalescence solvent, and a thickener; b) foaming the liquid aqueous coating composition to obtain a foamed coating composition; c) applying a layer of the foamed coating composition on the substrate; and d) allowing gas to escape from the layer of foamed coating composition and allowing the coating composition to dry to form a homogeneous non-foam dried coating, wherein the liquid aqueous coating composition provided in step a) comprises the acrylic resin in a concentration in the range of from 1 to 20 wt %, comprises the thickener in a concentration in the range of from 0.05 to 2.0 wt %, and has a solids content of at most 25 wt %, based on the total weight of the liquid aqueous coating composition. The invention further relates to foamed aqueous coating composition obtainable by steps a) and b).

    POLYMER, PROCESS AND USE
    40.
    发明申请

    公开(公告)号:US20170240765A1

    公开(公告)日:2017-08-24

    申请号:US15519354

    申请日:2015-10-21

    Abstract: The current invention relates to a process for preparing an aqueous binder composition free of organic solvent, the process comprising at least the following steps: A) preparing a hydrophilic vinyl polymer (Polymer A) by polymerisation of a monomer composition A that contains: Ai) at least one carboxylic acid functional olefinically unsaturated monomer; and Aii) at least one olefinically unsaturated monomer different than Ai); and Aiii) optionally at least one wet adhesion promoting olefinically unsaturated monomer different than Ai and Aii); where Polymer A has an acid value (AV) from 32 to 98 mg KOH/g of solid Polymer A; B) preparing a hydrophobic vinyl polymer (Polymer B) by emulsion polymerization of a monomer composition B in the presence of Polymer A where the monomer composition B contains: Bi) at least one olefinically unsaturated monomer; Bii) optionally carboxylic acid functional olefinically unsaturated monomer different than Bi); and Biii) optionally wet adhesion promoting olefinically unsaturated monomer different than Bi); where Polymer B has an acid value (AV) of no more than 23.4 mg KOH/g of solid polymer B, wherein at least a part of the carboxylic acid groups that are present in Polymer A and Polymer B are neutralized during or following the steps A and/or B to form a (partially) neutralized polymer emulsion; where the weight average molecular weight (Mw) of Polymer A is lower than the weight average molecular weight (Mw) of polymer B; and wherein the process is further characterized by the presence of a further step C) reacting at least 10 mol % of the carboxylic acid and/or carboxylate salt groups of the (partially) neutralized polymer emulsion with an iminating agent to produce an iminated polymer C; wherein the total amount of surfactant applied in steps A, B and C is at most 0.5 wt. %, based on the total weight of monomers charged for the preparation of polymer A and polymer B

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