23-03-2017 дата публикации
Номер: US20170081454A1
Принадлежит:
Polymer latex binders useful for preparing coating compositions containing low levels of, or which are substantially free of, volatile organic compounds (VOCs) such as volatile freeze-thaw additives are prepared by multistage emulsion polymerization, wherein one stage provides a copolymer having a relatively high glass transition temperature and containing an oxyalkylene-containing (meth)acrylate comonomer. 1. A multiphase emulsion polymer for coating compositions , said multiphase emulsion polymer comprising at least one hard phase polymer having a glass transition temperature of from 0 to 100° C. and at least one soft phase polymer having a glass transition temperature at least 20° C. lower to no more than 100° C. lower than the glass transition temperature of the hard phase polymer using the Fox equation , [{'br': None, 'sub': 2', 'n, 'sup': 1', '2, 'CH═C(R)—C(═O)—O—[X—O]—R;\u2003\u2003(I)'}, {'br': None, 'sub': 2', 'n', '2, 'sup': '1', 'CH═C(R)—C(═O)—O—[X—O]—P(═O)(OY);\u2003\u2003(II)'}], 'wherein the hard phase polymer is a copolymer of one or more ethylenically unsaturated monomer, and one or more oxyalkylene-containing (meth)acrylate corresponding to formula (I) or (II) or a mixture thereof{'sup': 1', '2, 'sub': 3', '1', '8', '2', '2', '2', '3', '3', '2, 'wherein Ris H or CH, Ris H or a C-Calkyl group, each X is independently —(CH)—, —CHCH(CH)— or —CH(CH)CH—, each Y is independently H, ammonium or an alkali metal atom, and n is an integer of from 1 to 30,'}wherein the soft phase polymer is a copolymer of monomers selected from the group consisting of C1-C18 alkyl(meth)acrylates, halo- and hydroxyl substituted alkyl esters of (meth)acrylic acid, vinyl esters of linear and branched carboxylic acids having 2 to 20 carbon atoms, unsaturated C3-C6 monocarboxylic acids, monoesters of unsaturated C4-C6 dicarboxylic acids, unsaturated C4-C6 dicarboxylic acids, (meth)acrylonitrile, cycloalkyl(meth)acrylates, aryl and alkaryl esters of (meth)acrylates, acetoacetate- ...
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