The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 2010
Filed:
Jul. 18, 2007
Atsushi Yamamoto, Kawanishi, JP;
Chiyoshi Nozaki, Otsu, JP;
Tsuyoshi Nozaki, Ikeda, JP;
Mitsuyo Matsumoto, Ibaraki, JP;
Katsunori Kurose, Takarazuka, JP;
Atsushi Yamamoto, Kawanishi, JP;
Chiyoshi Nozaki, Otsu, JP;
Tsuyoshi Nozaki, Ikeda, JP;
Mitsuyo Matsumoto, Ibaraki, JP;
Katsunori Kurose, Takarazuka, JP;
Ricoh Company, Ltd., Tokyo, JP;
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.