Spherical silica-titania-based fine particles...

Details Spherical silica-titania-based fine particles... Spherical silica-titania-based fine particles...

2006-12-05

2006-12-05

Green, Anthony J. (Department: 1755)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C106S445000, C106S446000, C106S482000, C106S490000, C427S291000, C430S108300, C430S108600

Reexamination Certificate

active

07144628

ABSTRACT:
Spherical silica-titania-based fine particles surface-treated with silane are provided. The fine particles have a titanium atom content of 0.001 to 5% by weight, a frictional electrification with iron powder of −100 to −300 μC/g, a bulk density of 0.2 to 0.4 g/ml, and a particle diameter of 0.01 to 5 μm. The particles are useful as a material for an external additive for an electrostatically charged image developing toner. The toner is unlikely to cause degeneration or scratching of organic photoreceptors, displays excellent dispersibility and favorable flowability and consequently does not cause adhesion to the photoreceptor.

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