Patent ID: 8455255

Claim:
A silica particle prepared by a method consisting of: (a) mixing one or more silica compound and ammonia water, the silica compound being selected from a group consisting of mercapto-propyl-trimethoxysilane (MPS), mercapto-propyl-triethoxysilane (MPES), mercapto-propyl-methyldimethoxysilane (MPDMS), trimethoxy[2-(7-oxabicyclo[4.1.0]-hepto-3-yl)ethyl]silane (EpoPS), thiocyanatopropyltriethoxysilane (TCPS), and acryloxypropyltrimethoxysilane (AcPS) and (b) reacting the silica compound and the ammonia water under a predetermined temperature condition, wherein the ammonia water and temperature condition in steps (a) and (b) satisfy either or both of the following conditions: (i) high temperature in a range of 80-100° C.; and (ii) high ammonia concentration at a final concentration not less than 25%.