Process for preparing highly dispersed metal oxides whose surfac

Details Process for preparing highly dispersed metal oxides whose surfac Process for preparing highly dispersed metal oxides whose surfac

1988-03-04

1990-02-20

Silverberg, Sam

Stock material or miscellaneous articles

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

Particulate matter

430110, 427214, 427220, 427221, G03G 910

Patent

active

049025708

ABSTRACT:
The invention relates to a process for preparing highly dispersed metal oxides whose surfaces are modified by an ammonium-functional organopolysiloxane as a charge controlling substance for positive chargeable toners, in which the highly dispersed metal oxides are reacted with an organopolysiloxane which contains silicon-bonded terminal hydroxyl and/or alkoxy groups, diorganosiloxane units, in which the two organic radicals are monovalent hydrocarbon radicals, and siloxane units in which the organic radicals contain a positive charged nitrogen which is bonded to silicon via carbon.

REFERENCES:
patent: 4229903 (1981-11-01), Au Clair
patent: 4568625 (1986-02-01), Uchiyama
patent: 4734350 (1986-03-01), Lin
patent: 4741984 (1988-05-01), Imai

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