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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.:

US 7157201 B1

PDFFull Text
Date of Patent:
Jan. 02, 2007

Filed:

Jun. 27, 2003

Toner for developing latent electrostatic image, container having the same, developer using the same, process for developing using the same, image-forming process using the same, image-forming apparatus using the same, and image-forming process cartridge using the same

Applicants:

Masami Tomita, Shizuoka, JP;

Tadao Takikawa, Aichi, JP;

Tomoyuki Ichikawa, Shizuoka, JP;

Fumihiro Sasaki, Shizuoka, JP;

Toshiki Nanya, Shizuoka, JP;

Hiroto Higuchi, Shizuoka, JP;

Shigeru Emoto, Shizuoka, JP;

Shinichiro Yagi, Shizuoka, JP;

Naohito Shimota, Shizuoka, JP;

Maiko Kondo, Shizuoka, JP;

Inventors:

Masami Tomita, Shizuoka, JP;

Tadao Takikawa, Aichi, JP;

Tomoyuki Ichikawa, Shizuoka, JP;

Fumihiro Sasaki, Shizuoka, JP;

Toshiki Nanya, Shizuoka, JP;

Hiroto Higuchi, Shizuoka, JP;

Shigeru Emoto, Shizuoka, JP;

Shinichiro Yagi, Shizuoka, JP;

Naohito Shimota, Shizuoka, JP;

Maiko Kondo, Shizuoka, JP;

Assignee:

Ricoh Company, Ltd., Tokyo, JP;

Attorney:

Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

Primary Examiner:

John L Goodrow

Int. Cl.
CPC ...
G03G 9/08 (2006.01); G03G 13/09 (2006.01);
U.S. Cl.
CPC ...
Abstract

A toner for developing a latent electrostatic image including a base of toner particle which contains a binder resin and a coloring agent, and an external additive. Herein, a plurality of the base of toner particle has a volume average particle diameter (Dv) of 3 μm to 7 μm, a ratio (Dv/Dn) of the volume average particle diameter (Dv) to a number average particle diameter (Dn) is 1.01 to 1.25, a plurality of the base of toner particle contains 15% by number or less of the base of toner particle having a particle diameter of 0.6 μm to 2.0 μm, a plurality of the base of toner particle has a circularity of 0.930 to 0.990 on average, the binder resin contains a modified polyester resin, and the toner contains 0.3 parts by weight to 5.0 parts by weight of the external additive, relative to 100 parts by weight of the base of toner particle.

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