An object of the present invention is to provide cationic hollow crosslinked polymer particles that maintain a cationic property over a wide pH range, has adequate strength, and is favorable for use in filled paper, pigments for coating paper, additives for paints, fillers for resins, rubbers, and the like. Another object of the present invention is to provide a method of producing the abovementioned cationic hollow crosslinked polymer particles with excellent characteristics in a stable manner. The hollow crosslinked polymer particles of the present invention are characterized in that (I) the zeta potential as measured in an aqueous medium of pH 2 to 9 is in the range of +5 to +100 mV, (II) the volume hollowness is in the range of 1 to 80%, and (III) the average particle diameter is in the range of 0.03 to 10 &mgr;m. This hollow crosslinked polymer particles are produced by a method that (a) 1 to 99.99 weight % of a crosslinking monomer, (b) 0.01 to 15 weight % of a cationic monomer, and (c) 0 to 98.99 weight % of a copolymerizable monomer that is non-crosslinking and nonionic (the total amount of the monomers being 100 weight %) are polymerized under the presence of polymer particles that are swellable by at least one of the above monomers. This hollow crosslinked cationic polymer particles are utilized for paint composition, cationic electrodeposition paint composition, resin composition, filled paper, paper coating composition, and coated paper, and the like.
本发明的一个目的是提供阳离子中空交联聚合物颗粒,该颗粒在较宽的 pH 值范围内保持阳离子特性,具有足够的强度,有利于用于填充纸、涂布纸
颜料、涂料添加剂、
树脂填料、橡胶等。本发明的另一个目的是提供一种以稳定的方式生产上述具有优良特性的阳离子空心交联聚合物颗粒的方法。本发明的中空交联聚合物颗粒的特征在于:(I) 在 pH 值为 2 至 9 的
水介质中测得的 zeta 电位在 +5 至 +100 mV 之间;(II) 体积空心率在 1 至 80% 之间;(III) 颗粒平均直径在 0.03 至 10 &mgr;m 之间。这种中空交联聚合物颗粒是通过以下方法生产的:(a) 1 至 99.99 重量%的交联单体,(b) 0.01 至 15 重量%的
阳离子单体,(c) 0 至 98.99 重量%的非交联和非离子可共聚单体(单体总量为 100 重量%),在至少一种上述单体可溶胀的聚合物颗粒存在下进行聚合。这种中空交联阳离子聚合物颗粒可用于涂料组合物、阳离子电沉积涂料组合物、
树脂组合物、填充纸、纸张涂层组合物和涂布纸等。