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:
Jun. 29, 2004
Filed:
Jan. 15, 2002
SK Chemicals Co., Ltd., Suwon, KR;
Abstract
The present invention relates to polyester resin for toner used for developing an electrostatic latent image such as a statically charged image in the electrostatic printing process and discloses polyester resin for toner comprising aromatic dicarboxylic acid, trivalent or higher carboxylic acid, aliphatic diol, bisphenol A derivative aromatic diol, and trihydric or higher alcohol, characterized in that the amount of the aromatic diol of bisphenol A derivative having the mole number of ethylene oxide and/or propylene oxide of 2mole is equal to or more than 85weight % in the entire aromatic diol of bisphenol A derivative, and the amount of the aromatic diol of bisphenol A derivative having the mole number of ethylene oxide or propylene oxide of 1mole is less than 0.2weight % in the entire aromatic diol of bisphenol A derivative.