Process for preparing highly dispersed metal oxides whose surfaces are modified by an ammonium-functional organopolysiloxane as a positive chargeable controlling agent for toners

US4902570A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Mario Heinemann · Burghausen, DE
• Johann Bindl · Burghausen, DE
• Johann Doppelberger · Emmerting, DE
• Hans-Peter Scherm · Emmerting, DE

Key dates

• Filing date: Mar 4, 1988
• Grant date: Feb 20, 1990
• Expiry date: Mar 4, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2995
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.