公开(公告)号：US5795926A

公开(公告)日：1998-08-18

申请号：US795307

申请日：1991-11-21

申请人： Manfred Niessner ,  Norbert Grund ,  Wilfried Heide ,  Heinrich Hartmann

发明人： Manfred Niessner ,  Norbert Grund ,  Wilfried Heide ,  Heinrich Hartmann

IPC分类号： B01D21/01 ,  C02F1/54 ,  C02F1/56 ,  C02F11/00 ,  C02F11/14 ,  C08F2/32 ,  C08F6/00 ,  C08F6/24 ,  C09K3/00 ,  C08K00/00

CPC分类号： C02F1/56 ,  C02F1/54 ,  C08F2/32 ,  Y10T428/2982

摘要： A process is described for the preparation of finely divided polymer powders by polymerizing water-soluble monomers in the aqueous phase of a water-in-oil emulsion in the presence of water-in-oil emulsifiers and polymerization initiators, removing the water from the resultant water-in-oil polymer suspension by azeotropic distillation, and isolating the suspended, finely divided polymer powder, either the polymerization of the water-soluble monomers being carried out in the presence of from 0.1 to 10% by weight, based on the monomers employed in the polymerization, of protective colloids, or the protective colloids being added to the water-in-oil polymer suspension after the polymerization is complete. The polymerization is preferably carried out in the presence of surfactant. The finely divided pulverulent polymers are used as flocculants or thickeners for aqueous systems.

摘要翻译： 描述了一种通过在油包水乳化剂和聚合引发剂的存在下在水包油乳液的水相中聚合水溶性单体来制备细碎聚合物粉末的方法，从所得物中除去水 通过共沸蒸馏将油包水聚合物悬浮液分离，并分离悬浮的细碎聚合物粉末，基于所用的单体，水溶性单体的聚合在0.1至10重量％的存在下进行 在保护胶体的聚合中，或在聚合完成后加入到油包水聚合物悬浮液中的保护胶体。 聚合优选在表面活性剂存在下进行。 精细分散的粉末聚合物用作水系统的絮凝剂或增稠剂。