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:
Sep. 21, 1999
Filed:
Oct. 08, 1997
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner for developing an electrostatic image is comprised of a binder resin, a colorant and a wax. The toner has the following rheological characteristics: (a) a temperature at which the ratio of a loss elastic modulus to a storage elastic modulus (G'/G'=tan .delta.) comes to be 1.0 is present in a temperature range of from 55.degree. C. to 70.degree. C., with an elastic modulus being 1.5.times.10.sup.8 Pa or below; (b) the ratio of the storage elastic modulus at a temperature of 40.degree. C. (G'.sub.40) to the storage elastic modulus at a temperature of 50.degree. C. (G'.sub.50), G'.sub.40 /G'.sub.50, is from 1.5 to 5.0; (c) the ratio of the storage elastic modulus at a temperature of 50.degree. C. (G'.sub.50) to the storage elastic modulus at a temperature of 60.degree. C. (G'.sub.60), G'.sub.50 /G'.sub.60, is from 3 to 20; (d) the ratio of the storage elastic modulus at a temperature of 70.degree. C. (G'.sub.70) to the storage elastic modulus at a temperature of 100.degree. C. (G'.sub.100), G'.sub.70 /G'.sub.100, is from 50 to 250; and (e) the ratio of the storage elastic modulus at a temperature of 110.degree. C. (G'.sub.110) to the storage elastic modulus at a temperature of 140.degree. C. (G'.sub.140), G'.sub.110 /G'.sub.140, is from 2 to 20.