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:
Dec. 03, 2013
Filed:
Apr. 23, 2010
Tatsuhiro Hishida, Fukui, JP;
Koji Ogawa, Fukui, JP;
Yasumichi Moriyama, Fukui, JP;
Masaaki Hosoda, Fukui, JP;
Kazuo Tanabe, Fukui, JP;
Tatsuhiro Hishida, Fukui, JP;
Koji Ogawa, Fukui, JP;
Yasumichi Moriyama, Fukui, JP;
Masaaki Hosoda, Fukui, JP;
Kazuo Tanabe, Fukui, JP;
Nicca Chemical Co., Ltd., Fukui-Shi, Fukui, JP;
Abstract
The invention provides an amorphous polyester resin that can sufficiently achieve the reciprocal performance properties of hot offset resistance and cold offset resistance, which is a major issue for a toner for electrostatic image development, while allowing adequate blocking resistance to be obtained, as well as a binder resin for toner for electrostatic image development, and an amorphous polyester resin production method, the amorphous polyester resin being obtained by reaction between a polybasic carboxylic acid compound and a polyhydric alcohol, wherein the polybasic carboxylic acid compound comprises (a) the reaction product between an aromatic polybasic carboxylic acid compound and a C2-4 glycol at 60 mol % or greater based on the total amount of the polybasic carboxylic acid compound, and the amorphous polyester resin has a glass transition point of 55° C. to 75° C. and a weight-average molecular weight of 10,000 to 50,000.