Treated Fumed Silica

摘要

Disclosed herein are treated fumed silica particles comprising a modified polydialkylsiloxane on the surface thereof, a method for preparing treated fumed silica particles, and a rheological system comprising a polar liquid and treated fumed silica particles. Also disclosed are toner compositions comprising toner particles and treated fumed silica particles comprising a modified polydialkylsiloxane.

主权项

1. A treated fumed silica particle comprising a modified polydialkylsiloxane on the surface thereof, wherein
(a) the modified polydialkylsiloxane (i) comprises a relative proportion of T2 groups of 20% or less, and a relative proportion of T1 groups of 10% or less; and (ii) comprises groups having the structure:wherein X is a trialkylsilyl or dialkylsilyl; and R1, R2 and R3 are independently hydroxyl, alkyl, alkoxy, silyl, or siloxy; and
(b) the silica particle has a surface silanol content of about 1 to about 2.2 SiOH/nm2.