Patent ID: 9243145
Filing Date: 2016-01-26
CPC Classification: C01P,C09C,Y10T

Claim Text:
1. Silica composite particles in which a silica particle surface is sequentially surface-treated with a titanium compound in which an organic group is bonded to a titanium atom through an oxygen atom, and a hydrophobizing agent, wherein: the silica composite paticles comprise a center portion and a surface layer; a titanium content in the silica composite particles measured using fluorescence X-ray is from 0.001% by weight to 10% by weight; a titanium content of the surface layer of the silica composite particles is larger than a titanium content of the center portion of the silica composite particles and satisfies the following Formula (1): an average particle diameter of the silica composite particles is from 30 nm to 500 nm; and a particle size distribution index of the silica composite particles is from 1.1 to 1.35, the particle size distribution index being a square root of the value obtained by dividing an 84% diameter by a 16% diameter using a cumulative frequency distribution of a circle-equivalent diameter.