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    • 3. 发明申请
    • Use of a polymer dispersant as a fluidising agent for hydraulic binder compositions and preparation thereof
    • 使用聚合物分散剂作为水硬性粘合剂组合物的流化剂及其制备方法
    • US20060172916A1
    • 2006-08-03
    • US10547626
    • 2004-02-25
    • Manuel HidalgoDjamel BensarsaMartial PabonFabio GibertiJean-Marc Corpart
    • Manuel HidalgoDjamel BensarsaMartial PabonFabio GibertiJean-Marc Corpart
    • C11D3/37
    • C08F220/04B01F17/0028B01F17/005B01F17/0057C04B24/163C04B24/20C04B24/2641C04B24/2647C04B24/2676C04B24/2688C04B28/02C04B2103/408C04B2103/10C04B2103/20C04B2103/50C04B2103/54
    • Polymer dispersant of polycarboxylate type comprising at least one copolymer obtained from a monomer composition comprising, in moles: A) 40 to 95% of at least one unsaturated carboxylic monomer, B) 5 to 60% of at least one acrylic ester or methacrylic ester monomer comprising a polyether chain, C) 0 to 20% of at least one third monomer selected from: acrylic ester or methacrylic ester or acrylamide or acrylamide derivative or vinylaromatic monomer or its sulphonated derivative, the copolymer having a controlled molecular mass distribution and being able to be obtained by a process comprising the stages of: i) polymerization in aqueous solution at a temperature ranging from 70 to 95° C. with an initiation and transfer system comprising: D) an oxidizing agent, E) a reducing agent selected from metabisulphite salts, and preferably from sodium metabisulphite or potassium metabisulphite, the monomers/reducing agent molar ratio not exceeding 50, ii) semi-continuous addition of the oxidizing agent and of the mixture of monomers over a time ranging from 1 to 4 hours, iii) introduction of the reducing agent, either as vessel heel, before the beginning of the addition of the oxidizing agent and of the monomers, or semi-continuously, mixed with the monomers, or semi-continuously, as a separate feed from the latter and from the oxidizing agent. The invention also relates to a specific preparation process and to uses as plasticizer in inorganic hydraulic binder compositions or as dispersing agent in pigment pastes or aqueous polymer dispersions.
    • 包含至少一种由单体组合物得到的共聚物的聚羧酸酯类聚合物分散剂,其包含摩尔数:A)40至95%的至少一种不饱和羧酸单体,B)5至60%的至少一种丙烯酸酯或甲基丙烯酸酯单体 包括聚醚链,C)0至20%的至少一种选自丙烯酸酯或甲基丙烯酸酯或丙烯酰胺或丙烯酰胺衍生物或乙烯基芳族单体或其磺化衍生物的第三单体,所述共聚物具有受控的分子量分布,并且能够 通过包括以下步骤的方法获得:i)在70至95℃的温度范围内在水溶液中聚合,引发和转移体系包括:D)氧化剂,E)选自偏亚硫酸氢盐 ,优选偏亚硫酸氢钠或偏亚硫酸氢钾,单体/还原剂摩尔比不超过50,ii)半连续添加氧化物 g试剂和单体混合物在1至4小时的时间内,iii)在开始加入氧化剂和单体之前引入还原剂,作为容器脚跟,或半连续 与单体混合,或半连续地作为与后者和氧化剂的单独进料混合。 本发明还涉及具体的制备方法,并且用作无机水硬性粘合剂组合物中的增塑剂或作为分散剂在颜料糊或水性聚合物分散体中使用。