| 摘要 |
PROBLEM TO BE SOLVED: To provide amorphous silica which is excellent in ink absorption, has stable dispersed liquid viscosity even when high concentration compounding is executed while maintaining clear image, has no variance of the dispersed liquid viscosity between lots, has no rapid change of torque at the time of manufacturing the dispersion liquid and is stable. SOLUTION: The amorphous silica, which has total pore volume by mercury method of >=2.4 ml/g to <3.2 ml/g, average grain size of >=4.0 μm to <9.0 μm, weight distribution ratio of particles of <2.52 μm of <=5.0% of total weight, weight distribution ratio of particles of >=16.0 μm of <=3.0% of total weight, total pore volume by nitrogen adsorption method of >=1.0 ml/g to <2.0 ml/g, mode diameter of >=100 Å and <300 Å, electric conductivity of filtrate of 4% aqueous suspension of <50 μS/cm, is used for an inkjet recording sheet. |
