Patent ID: 6887518

Claim:
A process for preparing silylated silica particles, comprising silylating silica particles with an organosiloxane composed of A units of the formula (I) (R 1 3 SiO 1/2 )â€ƒâ€ƒ(I) and B units of the formulae (IIa-c) (R 1 2 SiO 2/2 ), and/orâ€ƒâ€ƒ(IIa) (R 1 SiO 3/2 ), and/or (IIb) (SiO 4/2 )â€ƒâ€ƒ(IIc), said organosiloxane optionally bearing 1 or 2 attached groups X bonded to Si atoms where X is OR halogen, or acetoxy, where R is H or a monovalent C 1-4 alkyl radical, R 1 is identical or different a saturated or unsaturated, monovalent, or halogenated C 1-18 hydrocarbon radical, the number of groups â‰¡SiX or â•SiX 2 present in said organosiloxane defined as C, wherein A, B, and C obey the relationships 1â‰¦Bâ‰¦100 or 750<B<10,000, Bâ‰§A+C, and, when A+C=0, 10â‰¦Bâ‰¦100 or 750<B<10,000.