Preparation of stable aqueous polymer dispersions which contain an
alkenyl-aromatic compound as copolymerized units
    1.
    发明授权
    Preparation of stable aqueous polymer dispersions which contain an alkenyl-aromatic compound as copolymerized units 失效
    制备含有烯基芳族化合物作为共聚单元的稳定的聚合物水分散体

    公开(公告)号:US4661557A

    公开(公告)日:1987-04-28

    申请号:US749542

    申请日:1985-06-27

    CPC分类号: C08F212/06 D21H19/58

    摘要: A process for the preparation of stable aqueous polymer dispersions which contain an alkenyl-aromatic compound as copolymerized units, by polymerizing monomer mixtures which contain(a) not less than 2% by weight of an alkenyl-aromatic compound and(b) from 0.5 to 10% by weight of an ethylenically unsaturated C.sub.3 -C.sub.5 -carboxylic acid and/or its amide and/or its nitrile and/or an ethylenically unsaturated monomer containing sulfonic acid groups, with or without(c) acrylic acid esters, methacrylic acid esters and/or butadienein aqueous emulsion in the presence of a polymerization initiator, with or without an emulsifier and with or without a polymerization regulator, at a pH below 7, in the presence of from 0.2 to 2% by weight of formaldehyde.

    摘要翻译: 一种通过聚合含有(a)不少于2重量%链烯基 - 芳族化合物的单体混合物和(b)0.5至0.5重量%的单体混合物制备含有烯基芳族化合物作为共聚单元的稳定含水聚合物分散体的方法。 10重量%的烯键式不饱和C 3 -C 5羧酸和/或其酰胺和/或其腈和/或含有磺酸基的烯键式不饱和单体,具有或不具有(c)丙烯酸酯,甲基丙烯酸酯和 /或丁二烯水溶液中,在聚合引发剂存在下,在有或没有乳化剂的情况下,在有或没有聚合调节剂的情况下,在pH低于7的情况下,在0.2至2重量%的甲醛的存在下。

    Preparation of polymers from olefinically unsaturated monomers
    2.
    发明授权
    Preparation of polymers from olefinically unsaturated monomers 失效
    从烯属不饱和单体制备聚合物

    公开(公告)号:US5087676A

    公开(公告)日:1992-02-11

    申请号:US413589

    申请日:1989-09-28

    CPC分类号: C08F6/006 C08F4/40

    摘要: Polymers are prepared from olefinically unsaturated monomers in an aqueous medium using a free radical initiator system which is soluble in this medium and consists of an oxidizing agent, a reducing agent and an iron salt, by a process in which a corresponding redox initiator system which contains a vanadium salt is used in addition to this iron-containing redox initiator system, and the content of olefinically unsaturated residual monomers in aqueous polymer mixtures or solutions is reduced by this process.

    摘要翻译: 聚合物由水性介质中的烯属不饱和单体制备,使用自由基引发剂体系,其可溶于该介质并由氧化剂,还原剂和铁盐组成,其中相应的氧化还原引发剂体系含有 除了该含铁氧化还原引发剂体系外,还使用钒盐,通过该方法可以降低含水聚合物混合物或溶液中烯属不饱和残余单体的含量。

    Preparation of concentrated polyacrylate dispersions
    3.
    发明授权
    Preparation of concentrated polyacrylate dispersions 失效
    浓缩聚丙烯酸酯分散体的制备

    公开(公告)号:US4424298A

    公开(公告)日:1984-01-03

    申请号:US372799

    申请日:1982-04-28

    CPC分类号: C08F220/12

    摘要: Emulsion copolymerization of acrylic or methacrylic acid esters with from 0.3 to 10% by weight of .alpha.,.beta.-monoolefinically unsaturated monocarboxylic acids and/or dicarboxylic acids and/or their amides, with or without up to 25% by weight of styrene, acrylonitrile, vinyl acetate and/or vinyl chloride, using the emulsion feed process, gives particularly concentrated copolymer dispersions if an emulsifier system of 0.01-5.0% by weight of a sulfuric acid half-ester of an oxyalkylated alkylphenol and 0.01-1% by weight of a dialkyl sulfosuccinate, where alkyl is of 6 to 18 carbon atoms, is employed and the polymerization is carried out at pH 2-6.

    摘要翻译: 丙烯酸或甲基丙烯酸酯与0.3至10重量%的α,β-单烯属不饱和一元羧酸和/或二羧酸和/或其酰胺的乳液共聚合,具有或不含有至多25重量%的苯乙烯,丙烯腈, 使用乳液进料方法的乙酸乙烯酯和/或氯乙烯,如果使用0.01-5.0重量%的烷氧基化烷基酚的硫酸半酯的乳化剂体系和0.01-1重量% 二烷基磺基琥珀酸盐,其中烷基为6至18个碳原子,聚合反应在pH2-6下进行。