Patent ID: 6855335

Claim:
A process for preparing silica microcapsules comprising the steps of: preparing a precursor solution containing a compound of formula (1) by adding tetraethyl orthosilicate in an aqueous solution containing a hydrolysis catalyst; adding a core material and aminopropyltriepoxysilane into the precursor solution; and emulsifying and dispersing the resulting solution into a solution having a polarity opposite to that of the core material to perform a sol-gel reaction at the interface thus impregnating the core material, (OH) 3−x (RO) x —Si—O—[Si—O—Si] n —Si—(RO) x (OH) 3−x (1) wherein R is a C 1 to C 10 alkyl group, x is 1, 2 or 3, and n is an integer of 100 to 1,200.