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:
Feb. 26, 2002
Filed:
Aug. 25, 2000
Shinichi Sata, Wakayama, JP;
Eiji Shirai, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
A yellow toner comprising fine resin particles and an external additive being added to surfaces of the fine resin particles, wherein the fine resin particles comprise (a) a resin binder comprising a polyester obtained by polycondensing an alcohol component comprising a compound represented by the formula (I), with a carboxylic acid component comprising a dicarboxylic acid compound and a tricarboxylic or higher polycarboxylic acid compound; (b) a colorant comprising a compound represented by the formula (II); and (c) a charge control agent comprising a compound selected from the group consisting of metal compounds of a salicylic acid derivative represented by the formula (III); and metal compounds of a benzilic acid derivative represented by the formula (IV); and wherein the external additive comprises silica having an average particle size of from 35 to 350 nm.