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:
Mar. 01, 2005
Filed:
Jan. 31, 2002
Satoshi Mochizuki, Numazu, JP;
Hideki Sugiura, Fuji, JP;
Kazuhiko Umemura, Shizuoka-ken, JP;
Minoru Masuda, Numazu, JP;
Kohsuke Suzuki, Shizuoka, JP;
Tomomi Suzuki, Numazu, JP;
Yasuo Asahina, Numazu, JP;
Satoshi Mochizuki, Numazu, JP;
Hideki Sugiura, Fuji, JP;
Kazuhiko Umemura, Shizuoka-ken, JP;
Minoru Masuda, Numazu, JP;
Kohsuke Suzuki, Shizuoka, JP;
Tomomi Suzuki, Numazu, JP;
Yasuo Asahina, Numazu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A dry toner for developing electrostatic images, including a colorant and a binder resin which comprises a copolymer resin having (A) a polyol resin moiety having a main chain of polyoxyalkylene and obtained by reaction of (a) an epoxy resin, (b) a dihydric phenol, and (c) an alkylene oxide adduct of a dihydric phenol or a glycidyl ether thereof; and (B) a polyester resin moiety obtained by reacting an alkylene oxide adduct of a dihydric phenol or a glycidyl ether thereof with a polycarboxylic acid, wherein the weight ratio of the epoxy resin of the polyol resin moiety (A) to the polyester resin moiety (B) is 95:5 to 60:40, wherein the epoxy resin includes at least two kinds of bisphenol epoxy resins having different number-average molecular weights, and wherein the binder resin has an acid value of not greater than 5.