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:
Jul. 13, 1993
Filed:
Oct. 23, 1991
Keiji Yoshida, Nagoya, JP;
Ryo Funato, Nagoya, JP;
Syuji Takahiro, Nagoya, JP;
Shinji Kubo, Toyohashi, JP;
Motoshi Inagaki, Nagoya, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
A binder for toner comprising a styrene/(meth)acrylate copolymer obtained by polymerizing polymerizable vinyl monomers comprising styrene and/or its derivative and a (meth)acrylate by suspension polymerization of 0.001-3 wt. %, based on the total weight of the monomers used, of at least one polyvinyl alcohol having a degree of saponification of 75-98% and 1.0-10 wt. %, based on the total weight of the monomers used, of at least one azo initiator. According to the present invention, there is provided a binder for a toner which produces copied images having excellent stability of image quality (life) even after a large number of times of copying.