申请人:Kuraray Co., Ltd.
公开号:EP1916262A1
公开(公告)日:2008-04-30
PROBLEMS: To easily and efficiently obtain a high quality (meth) acrylate-based polymer containing small residual amount of metal components (an aluminum component, an alkali metal component and other metal components) and having high purity and excellent properties such as heat resistance, transparency and others.
MEANS FOR SOLVING THE PROBLEMS: The present invention provides a method of obtaining a (meth)acrylate-based polymer by adding an acid to a reaction solution containing the (meth) acrylate-based polymer obtained by polymerizing a (meth) acrylate-based monomer in a water-insoluble organic solvent in the presence of a metal compound such as a metal-containing polymerization initiator, an organoaluminum compound and the like, washing the reaction solution to which the acid has been added by admixing water at 90°C or more, separating the mixed solution of the reaction solution and water generated by washing into an organic solvent solution layer and an aqueous solution layer, isolating the organic solvent solution separated into a layer, and obtaining the (meth)acrylate-based polymer out of the solution. Also provided is a high-purity (meth)acrylate-based polymer having excellent transparency obtained by the method.
问题为了简便而有效地获得一种含有少量金属成分(铝成分、碱金属成分和其他金属成分)的高质量(甲基)丙烯酸酯基聚合物,这种聚合物具有高纯度和优异的性能,如耐热性、透明度和其他性能。
解决问题的方法:本发明提供了一种获得(甲基)丙烯酸酯基聚合物的方法,该方法是:在含有(甲基)丙烯酸酯基单体在水不溶性有机溶剂中聚合得到的(甲基)丙烯酸酯基聚合物的反应溶液中加入酸,该反应溶液存在金属化合物,如含金属的聚合引发剂、有机铝化合物等、通过在 90°C 或更高温度下加入水对添加了酸的反应溶液进行洗涤,将反应溶液和洗涤产生的水的混合溶液分离成有机溶剂溶液层和水溶液层,将分离成一层的有机溶剂溶液分离出来,并从溶液中获得(甲基)丙烯酸酯基聚合物。此外,还提供了通过该方法获得的透明度极佳的高纯度(甲基)丙烯酸酯基聚合物。