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. 29, 2001
Filed:
Sep. 22, 1999
Masanobu Nakamura, Warabi, JP;
Toshiro Kogawara, Iwatsuki, JP;
Hideki Gambayashi, Ageo, JP;
Norio Aoki, Ohmiya, JP;
Yoshinori Shimane, Ichikawa, JP;
Ryozo Sugawara, Sodegaura, JP;
Kinji Shinzo, Sakura, JP;
Dainippon Ink Chemicals, Inc., Tokyo, JP;
Abstract
An electrostatic image developer is provided which has superior fixation properties and anti-offset properties, exhibits stable charge behavior even during continuous printing, and has superior durability and permits a high-quality image to be obtained. This electrostatic image developer is a toner composition containing colored resin particles comprising at least a binder resin, a colorant, and a charge control agent, wherein (1) an epoxy compound with a valence of 5 or more, (2) a polybasic acid compound having a valence of 2 or more selected from the group consisting of polybasic acids and/or acid anhydrides and/or lower alkyl esters thereof, and (3) a polyvalent alcohol having a valence of 2 or more, are employed as chief structural components of the binder resin, and a polyester resin is produced by reacting components (1)-(3) simultaneously, or by first reacting components (1) and (3), and subsequently reacting component (2), or by first reacting components (1) and (2), and subsequently reacting component (3).