申请人:National Starch and Chemical Investment
Holding Corporation
公开号:EP0346834A2
公开(公告)日:1989-12-20
A process for the polymerization of polymers containing at least one hydrophilic monomeric component and at least one hydrophobic monomeric component comprising the step of polymerizing the monomers in the presence of free radical polymerization initiators in an aqueous medium consisting of water and a cosolvent, wherein the amount of cosolvent is monitored so as to maintain the ratio of water to cosolvent equal or greater than unity during the reaction, thereby keeping the polymer as it forms in a sufficiently mobile condition and preventing homopolymerization and precipitation of the polymer from the hydrophobic monomer; thereby producing a polymer as a relatively high solids, low viscosity, opaque or semi-opaque product which is stable and slightly cloudy, opaque or semi-opaque, which exhibits no gelling, coagulation or product separation on standing and which, upon dilution to 0.25% solids content W/W, has a turbidity of at least 10 Nephelometric Turbidity units.
一种含有至少一种亲水性单体组分和至少一种疏水性单体组分的聚合物的聚合工艺,包括在由水和共溶剂组成的水介质中,在自由基聚合引发剂的存在下使单体聚合的步骤,其中共溶剂的量受到监控,以便在反应过程中保持水与共溶剂的比例等于或大于一,从而使形成的聚合物保持足够的流动性,并防止聚合物与疏水性单体发生均聚和沉淀;从而生产出一种聚合物,它是一种相对高固含量、低粘度、不透明或半不透明的产 品,该产品稳定且略微浑浊,不透明或半不透明,静置时不出现胶凝、凝结或产品分 离,稀释至 0.25% 的固体含量(W/W)时,浊度至少为 10 奈菲尔浊度单位。