Patent ID: 8034173

Claim:
A process for producing a process composition comprising: (a) providing a pre-dispersion of silica particles comprising stirring hydrophobically modified fumed silica particles into a solution comprising (i) at least one compound of general formula (I) or (II): (R 1 R 2 R 3 Si) 2 NR 4 (I) —(R 1 R 2 SiNR 4 ) m -(cyclo) (II) wherein R 1 , R 2 , and R 3 can be the same or different, and are independently selected from hydrogen, straight or branched, saturated or unsaturated alkyl chain groups of from 1 to 8 carbon atoms, or aromatic groups of from 6 to 12 carbon atoms, R 4 is hydrogen or a methyl group, and m is from 3 to 8, and (ii) a first volatile solvent or solvent mixture selected from straight or branched, linear or cyclic aliphatic, or aromatic hydrocarbons with 2 to 14 carbon atoms, monovalent linear or branched alcohols with 1 to 6 carbon atoms, ketones or aldehydes with 1 to 6 carbon atoms, ethers or esters with 2 to 8 carbon atoms, or linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units, wherein the concentration of the hydrophobically modified fumed silica particles in the pre-dispersion results in from 10 percent to about 30 percent by weight of the total weight of the pre-dispersion, and wherein the concentration of any one of compounds (I) and/or (II) is between 0.1 and 10 percent by weight of the total weight of the pre-dispersion; and (b) dispersing said pre-dispersion to provide a process composition while reducing said hydrophobically modified fumed silica particles to a median particle size in the range between 100 and 4000 nm.