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:
May. 26, 1998
Filed:
Feb. 02, 1996
Shinichiro Omatsu, Wakayama, JP;
Tetsuhiro Semura, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
The toner for full-color electrophotography usable for a fixing process by a heat roller, wherein a releasing oil is not applied on a surface of the heat roller, includes at least (a) a binder resin having as a main component a linear polyester obtainable using one or more monomers selected from the group consisting of saturated or unsaturated, aliphatic dicarboxylic acids, acid anhydrides thereof, and lower alkyl esters thereof as an acid component, provided that the saturated aliphatic dicarboxylic acids have carbon atoms of not less than 3, and that the unsaturated aliphatic dicarboxylic acids have carbon atoms of not less than 5, the linear polyester having a softening point of from 90.degree. to 120.degree. C. determined by 'koka' type flow tester; (b) a releasing agent comprising carnauba wax; and (c) a coloring agent. The method for forming fixed images for full-color electrophotography includes the steps of forming an unfixed image by using three or four kinds of toners on a recording medium in single or more toner layers wherein said toners include at least one toner for full-color electrophotography of the present invention; and fixing by heat and pressure the unfixed image using a heat roller without a device for applying a releasing oil.