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    Preparation of water-soluble high polymers
    2.
    发明授权
    Preparation of water-soluble high polymers 失效
    水溶性聚合物的制备

    公开(公告)号：US4075183A

    公开(公告)日：1978-02-21

    申请号：US642185

    申请日：1975-12-18

    申请人： Shigenao Kawakami ,  Tatsumi Shibata ,  Shin-ichi Isaoka ,  Tutomu Shintani

    发明人： Shigenao Kawakami ,  Tatsumi Shibata ,  Shin-ichi Isaoka ,  Tutomu Shintani

    IPC分类号： C08F220/56 ,  C08F28/00 ,  C08F2/00 ,  C08F20/70 ,  C08G75/00

    CPC分类号： C08F220/56 ,  Y10S526/923

    摘要： In the production of a water-soluble, cationic high polymer of (A) at least one of acrylamide and methacrylamide and (B) at least one of ammonium type monomers of either one of the formulas: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group, R.sub.2 and R.sub.3 are each a lower alkyl group, R.sub.4 is a hydrogen atom, a lower alkyl group, an aryl group, a hydroxy(lower)alkyl group, a benzyl group or a group of the formula: --CH.sub.2 COO(CH.sub.2).sub.m CH.sub.3 (m being an integer of 0 or 1), R.sub.5.sup.- is a group of either one of the formulas: --(CH.sub.2).sub.2 COO.sup.- and -(CH.sub.2).sub.3 SO.sub.3.sup.-, X is a halogen atom or an acid residue, Y is -O- or --NH-- and n is an integer of 1 to 4, a process which comprises initiating the polymerization of the monomeric component (A) with or without a portion of the monomeric component (B) in an aqueous medium containing an organic solvent selected from the group consisting of acetone, acetonitrile, t-butanol, tetrahydrofuran and dioxane at a concentration of about 15 to 70 % by weight until the polymerization proceeds to a certain extent and then continuing the polymerization while adding the remaining portion of the monomeric component (B) thereto under the occasional supplementation of a water-miscible organic solvent thereto so as to keep an appropriate viscosity of the reaction system to produce the high polymer in a high yield with ease.

    Process for producing high molecular weight acrylamide water-soluble polymers by controlling the viscosity of the polymerization reaction medium with a water-miscible organic solvent
    6.
    发明授权
    Process for producing high molecular weight acrylamide water-soluble polymers by controlling the viscosity of the polymerization reaction medium with a water-miscible organic solvent 失效
    通过用水混溶性有机溶剂控制聚合反应介质的粘度来生产高分子量丙烯酰胺水溶性聚合物的方法

    公开(公告)号：US3969329A

    公开(公告)日：1976-07-13

    申请号：US541623

    申请日：1975-01-16

    申请人： Eiichi Hirata ,  Shin-ichi Isaoka ,  Shiro Sakai

    发明人： Eiichi Hirata ,  Shin-ichi Isaoka ,  Shiro Sakai

    IPC分类号： B01D21/01 ,  C02F1/54 ,  C08F2/00 ,  C08F2/10 ,  C08F20/56 ,  C08F28/00 ,  C08F120/52 ,  C08G75/00

    CPC分类号： C02F1/54 ,  C08F20/56

    摘要： Water-soluble high molecular weight polymers, useful as coagulating agents, are prepared by initiating the polymerization of acrylamide or a monovinyl monomer mixture containing a predominant amount of acrylamide in an acetone-water mixture at a temperature of not lower than 5.degree.C but of lower than 25.degree.C in the presence of polyvinyl alcohol and a catalyst, the concentration of the monomer in the polymerization reaction mixture being 15 to 30 % by weight and the concentration of acetone in the acetone-water mixture being 15 to 35 % by weight, and continuing the polymerization reaction while controlling the viscosity of the reaction system by adding a water-miscible organic solvent having a small chain transfer coefficient to the reaction system with the progress of the polymerization reaction.

    摘要翻译： 可用作凝结剂的水溶性高分子量聚合物通过在不低于5℃的温度下引发丙烯酰胺或含有主要量的丙烯酰胺的单乙烯基单体混合物在丙酮 - 水混合物中的聚合来制备，但是 在聚乙烯醇和催化剂存在下低于25℃，聚合反应混合物中单体的浓度为15〜30重量％，丙酮 - 水混合物中丙酮的浓度为15〜35重量％ 并且随着聚合反应的进行，通过向反应体系中加入具有小链转移系数的水混溶性有机溶剂来控制反应体系的粘度，并继续进行聚合反应。