US Patent 7419755 Carrier composition

Patent 7419755 was granted and assigned to Xerox on September, 2008 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Xerox

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7419755

Date of Patent

September 2, 2008

Patent Application Number

11159035

Date Filed

June 22, 2005

Patent Primary Examiner

‌

Mark A Chapman

Patent abstract

Carrier particles comprise a core and a polymer coating that comprises a mixture of polymethyl methacrlyate (PMMA) and melamine. The coating compositions comprise from about 60 to about 80 percent by weight of PMMA and from about 20 to about 40 percent by weight of melamine. The carriers may be combined with a toner to provide a developer suitable for use in an electrostatographic process. Carriers comprising the PMMA/melamine coatings exhibit increased triboelectric charging, a more conductive carrier, and also contribute to reducing toner cohesion.