PROCESS FOR PRODUCTION OF WATER−SOLUBLE (METH)ACRYLIC POLYMERS, WATER−SOLUBLE (METH)ACRYLIC POLYMERS, AND USE THEREOF
申请人:Nippon Shokubai Co., Ltd.
公开号:EP1454928A1
公开(公告)日:2004-09-08
The present invention is a method of producing a (meth)acrylic acid based water-soluble polymer having a content of groups in neutralized state of not more than 90 mole percent, where the sum total of acid groups and groups in neutralized state contained in the (meth)acrylic acid based water-soluble polymer is taken as 100 mole percent, which comprises a photopolymerization step of polymerizing a monomer component by irradiating near-ultraviolet rays to a reaction mixture, the said reaction mixture comprising the monomer component, a photopolymerization initiator, a chain transfer agent and a polymerization solvent, the said monomer component containing not less than 50 mole percent of a (meth)acrylic acid monomer, with the whole monomer component subjected to polymerization being taken as 100 mole percent, and a concentration of the said monomer component in the reaction mixture at the time of polymerization being 40 to 97% by mass.
本发明是一种生产(甲基)丙烯酸基水溶性聚合物的方法,该聚合物的中和基团含量不超过90摩尔%,其中(甲基)丙烯酸基水溶性聚合物所含酸性基团和中和基团的总和为100摩尔%,该方法包括光聚合步骤,即通过向反应混合物照射近紫外线使单体组分聚合、所述反应混合物包括单体组分、光聚合引发剂、链转移剂和聚合溶剂,所述单体组分中含有不少于 50 摩尔%的(甲基)丙烯酸单体,整个单体组分的聚合度为 100 摩尔%,聚合时所述单体组分在反应混合物中的浓度为 40% 至 97%(质量百分比)。