There is provided a water dispersion for a sustained release preparation, the dispersion having viscosity at 25° C. of not more than 100 mPa·s and including polymer particles which are obtained by polymerizing ethylenically unsaturated group-containing monomers (A); at least one kind of a hydrophilic substance (B) in an amount of more than 0% by weight but not more than 20% by weight relative to a total amount of the ethylenically unsaturated group-containing monomers (A), being selected from a group consisting of a surfactant, a plasticizer and a moisturizer; polyvinyl alcohol (C) in an amount of more than 0% by weight but not more than 30% by weight relative to a total amount of the ethylenically unsaturated group-containing monomers (A), having a degree of saponification of more than 82 mol %; and water.
提供一种
水分散体,用于持续释放制剂,该分散体在25℃下的粘度不超过100mPa·s,包括通过聚合含有
乙烯基不饱和基团的单体(A)而获得的聚合物颗粒;至少一种亲
水性物质(B),相对于含有
乙烯基不饱和基团的单体(A)的总量,重量百分比大于0%但不超过20%,所选自表面活性剂、
增塑剂和保湿剂的组;聚
乙烯醇(C),相对于含有
乙烯基不饱和基团的单体(A)的总量,重量百分比大于0%但不超过30%,其皂化度大于82摩尔%;以及
水。