PROBLEM TO BE SOLVED: To provide an abrasive porous silica particle small in specific surface and large in pore volume and a manufacturing method therefor.SOLUTION: The porous silica particle has properties such as (i) average circularity of 0.7 to 1.0, (ii) pore volume (Pv) of 0.1≤Pv<1.0 ml/g, (iii) specific area of 5 to 60 m2/cm3, (iv) median diameter (D50) of 50 to 1000 μm, (v) ratio (D100/D50) of maximum particle diameter (D100) and median diameter (D50) of 3.0 or less, and (vi) median diameter (DR50) of 5 to 40 μm and maximum particle diameter (DR100) of 15 to 200 μm after rubbing at load of 1.0 to 1.4 KPa for 30 seconds.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】 比表面積が小さく、かつ細孔容積が大きい摩耗性の多孔質シリカ系粒子とその製造方法を提供する。【解決手段】 本発明の多孔質シリカ系粒子は、(i)平均円形度が0.7~1.0(ii)細孔容積(Pv)が0.1≦Pv<1.0ml/g(iii)比表面積が5~60m2/cm3(iv)メジアン径(D50)が50~1000μm(v)最大粒子径(D100)とメジアン径(D50)の比(D100/D50)が3.0以下(vi)1.0~1.4KPaの荷重で30秒間塗擦した後のメジアン径(DR50)が5~40μmであり、最大粒子径(DR100)が15~200μm、という特性を備えている。【選択図】 図1
