Patent ID: 7008982

Claim:
A method of preparing a treated silica substrate comprising the sequential steps of: a) providing silica particles; b) contacting the silica particles with at least one polysiloxane conforming to formula (I) wherein n is an integer greater than 1, preferably between about 30 to about 100; X is selected from a hydrogen atom or an R′ group, preferably methyl; R, R′ are independently selected organic groups, with from about 1 to about 20 carbon atoms; and Y and Z are silicon-containing terminating end groups, preferably Y is —OSi(CH 3 ) 3 and Z is —Si(CH 3 ) 3 ; and c) contacting the silica particles with an organosilane described by the formula: RSi(R′) x (OR″) 3-x (II) wherein R is a lone-chain hydrocarbon group having between about 8 to about 30 carbon atoms, and optionally contains organofunctional groups selected from the group consisting of vinyl, methacryl, amino, sulfur, and epoxy groups; R′ and R″ are independently selected from the group consisting of a methyl and an ethyl; and X is either 0 or 1.