Treated silica fine powder and toner for developing electrostati

Details Treated silica fine powder and toner for developing electrostati Treated silica fine powder and toner for developing electrostati

1992-03-19

1994-04-26

McCamish, Marion E.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

1062871, 428404, G03G 908

Patent

active

053065883

ABSTRACT:
A treated silica fine powder and a toner having this powder to be used as a toner for developing an electrostatic image. The treated silica fine powder is formed of treated fine silica particles obtained by treating fine silica particles with (a) a first silane coupling agent in which at least one of a substituted secondary alkyl group, an unsubstituted secondary alkyl group, a substituted tertiary alkyl group, an unsubstituted tertiary alkyl group, a substituted cyclic hydrocarbon group and an unsubstituted cyclic hydrocarbon group is bonded to a silicon atom of the silane coupling agent, and by thereafter treating the resultant fine particles of silica with a second silane coupling agent having the formula ##STR1## wherein R1 represents a methyl group, a halomethyl group, a saturated straight chain hydrocarbon group or an unsaturated straight chain hydrocarbon group; Y represents an alkoxy group or a halogen group; m represents an integer of 1 to 3; n represents an integer of 1 to 3; and m and n are 4.

REFERENCES:
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patent: 3720617 (1973-03-01), Chatterji et al.
patent: 3819367 (1974-06-01), Chatterji et al.
patent: 4618556 (1986-10-01), Takenouchi
patent: 4680245 (1987-07-01), Suematsu et al.
patent: 4737432 (1988-04-01), Tanaka et al.
patent: 5141833 (1992-08-01), Kitamori et al.

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