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:
Oct. 26, 1999
Filed:
Oct. 25, 1996
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner for developing an electrostatic image is composed from a composition including: polymer components, a colorant, a wax and a charge-controlling agent. The polymer components are characterized by (a) containing substantially no THF (tetrahydrofuran)-insoluble content; (b) containing a THF-soluble content giving a GPC (gel permeation chromatography) chromatogram showing a main peak in a molecular weight region of 3.times.10.sup.3 -3.times.10.sup.4, and a sub-peak or shoulder in a molecular weight region of 1.times.10.sup.5 -3.times.10.sup.6, and (c) including a low-molecular weight polymer component having molecular weights of below 5.times.10.sup.4 on the GPC chromatogram and an acid value A.sub.VL, and a high-molecular weight polymer component having molecular weights of at least 5.times.10.sup.4 and an acid value A.sub.VH satisfying A.sub.VL >A.sub.VH. The wax has an acid value A.sub.VWax satisfying A.sub.VL >A.sub.VWax and A.sub.VWax >0 (mgKOH/g). The toner is characterized by a good combination of low-temperature fixability and anti-offset characteristic, a stable chargeability, and freeness from sleeve ghost phenomenon.