Hollow polymer particles, process for production thereof, and use thereof as pigment
申请人:JAPAN SYNTHETIC RUBBER CO., LTD.
公开号:EP0331421A2
公开(公告)日:1989-09-06
Hollow polymer particles having at least two polymer layers, wherein (1) the particles have an average particle diameter in the range of 0.15 to 20 micrometers, (2) each of the particles has an average equivalent hollow diameter/equivalent particle diameter in the range of 0.2 to 0.8, (3) the proportion of a toluene-insoluble portion of the particles is 20 to 90 % by weight, (4) the polymer particles have a melt flow rate at 180 °C under 10 kgf/cm² of 0.1 to 1 g/10min., (5) the inside layer of the two polymer layers is composed of a crosslinked polymer and (6) the outside layer of the two polymer layers is composed of a non-crosslinked polymer. This invention also provides hollow crosslinked polymer particles wherein the proportion of a toluene-insoluble portion of the particles exceeds 85 % by weight, the melt flow rate of the polymer particles at 180 °C under 10 kgf/cm² is less than 0.2 g/10 min., and the outside layer is composed of a crosslinked polymer. The hollow polymer particles are useful, for example, as a pigment and for a paper coating composition and a general-purpose coating composition.
具有至少两个聚合物层的中空聚合物颗粒,其中(1)颗粒的平均颗粒直径在 0.15 至 20 微米范围内;(2)每个颗粒的平均等效中空直径/等效颗粒直径在 0.2 至 0.8 范围内;(3)颗粒中甲苯不溶部分的重量比例为 20%至 90%;(4)聚合物颗粒在 180℃、10 千克力/平方厘米条件下的熔体流动速率为 0.1 至 1 克/10 分钟、(5) 两层聚合物的内层由交联聚合物组成, (6) 两层聚合物的外层由非交联聚合物组成。本发明还提供了空心交联聚合物颗粒,其中甲苯不溶部分的比例超过 85%(按重量计),聚合物颗粒在 180 °C 条件下 10 kgf/cm² 的熔体流动速率小于 0.2 g/10min.,外层由交联聚合物组成。空心聚合物颗粒可用作颜料、纸张涂层组合物和通用涂层组合物等。