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    • 61. 发明申请
    • Vinyl alcohol copolymers for use in aqueous dispersions and melt extruded articles
    • 用于水性分散体和熔融挤出制品的乙烯醇共聚物
    • US20050065272A1
    • 2005-03-24
    • US10946970
    • 2004-09-21
    • Richard Vicari
    • Richard Vicari
    • C08F2/00C08F2/06C08F8/12C08F218/08C08F220/58
    • C08F220/58C08F8/12C08F8/48C08F218/08C08F2800/20C08F8/28C08F216/06C08F2220/585
    • In a method of preparing an aqueous dispersion selected from drilling fluids, hydraulic cement compositions, mineral pigment containing coatings, and papermaking furnishes or in a method of preparing a melt extrudate, the improvement comprising: a) producing a copolymer of vinyl alcohol (VOH) and 2-acrylamido-2-methyl propane sulfonic acid or a salt of such acid (AMPS) by steps including continuously feeding with agitation, vinyl acetate (VAM) and AMPS as comonomers, a free radical yielding polymerization initiator, and a solvent for said comonomers, initiator, and copolymer resulting from the copolymerization of said comonomers, maintaining the resulting reaction mass in said first reaction zone under polymerization conditions for a residence time sufficient for a major proportion of AMPS fed to said first reaction zone to polymerize, continuously feeding reaction mass from said first reaction zone with an additional supply of AMPS to a second reaction zone, maintaining the reaction mass in the second reaction zone for a residence time sufficient to polymerize a major proportion of the AMPS added to the second reaction zone, continuously withdrawing reaction mass from the second reaction zone, separating copolymer of VAM and AMPS from the latter reaction mass, and saponifying by hydrolysis and/or alcoholysis a major proportion of the acetate groups in said copolymer to form a copolymer of VOH and AMPS; and b) incorporating the saponified copolymer into the aqueous dispersion or melt extrudate.
    • 在制备选自钻井液,水硬性水泥组合物,含矿物颜料的涂料和造纸配料的水性分散体的制备方法中,或在制备熔融挤出物的方法中,改进包括:a)制备乙烯醇(VOH) 和2-丙烯酰胺基-2-甲基丙磺酸或这种酸的盐(AMPS),其中包括连续进料搅拌,乙酸乙烯酯(VAM)和AMPS作为共聚单体,产生自由基的聚合引发剂和用于所述 由共聚单体的共聚产生的共聚单体,引发剂和共聚物,在聚合条件下将所得到的反应物质保持在所述第一反应区中,停留时间足以使进料至所述第一反应区的大部分AMPS聚合,连续进料反应 质量从所述第一反应区与附加的AMPS供应到第二反应区,维持反应m 在第二反应区中的絮凝物的停留时间足以聚合添加到第二反应区中的主要部分的AMPS,连续地从第二反应区抽出反应物质,将VAM和AMPS的共聚物与后一反应物质分离,并皂化 通过水解和/或醇解所述共聚物中主要部分的乙酸酯基团以形成VOH和AMPS的共聚物; 和b)将皂化的共聚物掺入水性分散体或熔融挤出物中。