US Patent 7709171 Charge control agent, toner and toner producing method

Patent 7709171 was granted and assigned to RICOH COMPANY,LTD. on May, 2010 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

77091710

Patent Inventor Names

Tsuyoshi Nozaki0

Chiyoshi Nozaki0

Katsunori Kurose0

Mitsuyo Matsumoto0

Atsushi Yamamoto0

Date of Patent

May 4, 2010

Patent Application Number

117796480

Date Filed

July 18, 2007

Patent Primary Examiner

‌

John L. Goodrow

Patent abstract

The present invention provides a charge control agent, adapted to control charging ability of resins or compositions containing resins, comprising a copolymer that comprises a polymer block A and a polymer block B, the polymer block A is prepared by copolymerizing a maleimide, which being unsubstituted or substituted for a hydrogen atom of an imide group by an electron-donating group, and styrene or a styrene derivative, and the polymer block B is formed of a polymer of styrene or a styrene derivative.

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