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:
Jul. 26, 2002
Toyo Ink Manufacturing Co., Ltd., Tokyo, JP;
Abstract
An electrostatic image developing toner comprising at least a binder resin and a releasant, wherein the binder resin comprises a petroleum resin and a styrene-based copolymer or styrene-based homopolymer in an amount of 5:5 to 7:3 by weight in terms of the ratio of the petroleum resin:styrene-based copolymer or styrene-based homopolymer and has the maximum molecular weight value (P ) based on the petroleum resin in a range of from 5×10 to 2×10 and the maximum molecular weight value (P ) based on the styrene-based copolymer or styrene-based homopolymer in a range of from 1×10 to 4.5×10 in the chromatogram obtained by measuring the binder resin through gel permeation chromatography and the releasant is a wax having a melt viscosity at 140° C. of 10 mPa/s (cp) or less and is added in an amount of 1 to 7 parts by weight per 100 parts by weight of the toner.