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:
Nov. 24, 1998
Filed:
Jun. 12, 1996
Manabu Ohno, Funabashi, JP;
Satoshi Mitsumura, Yokohama, JP;
Nobuyuki Okubo, Yokohama, JP;
Yoshinori Tsuji, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A toner for developing electrostatic images, includes toner particles and 10-500 isolated low-molecular weight wax particles per 10,000 toner particles. The toner has a melt index as measured at 125.degree. C. under a load of 98 N of at least 10. The toner particles comprise at least a binder resin, a colorant and the low-molecular weight wax. The low-molecular weight wax comprises a compound represented by the formula of: R--Y, wherein R denotes a hydrocarbon group, and Y denotes a hydroxyl group, carboxyl group, alkyl ether group or alkyl ester group. The low-molecular weight wax has a thermal property providing a DSC curve as measured by a differential scanning calorimeter exhibiting: (i) a maximum heat-absorption peak having a peak temperature in a temperature range of 70.degree.-130.degree. C.; (ii) a heat-absorption peak including the maximum heat-absorption peak showing an onset temperature of at least 50.degree. C., and (iii) a maximum heat-evolution peak in a range of .+-.15.degree. C. from the peak temperature of the maximum hat-absorption peak. The toner shows a good fixability while retaining a good productivity through the melt-kneading-pulverization process.