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. 25, 2016
Filed:
Mar. 16, 2015
Azumi Miyaake, Kanagawa, JP;
Hiroshi Yamashita, Shizuoka, JP;
Daisuke Asahina, Shizuoka, JP;
Ryo Miyakoshi, Shizuoka, JP;
Satoyuki Sekiguchi, Shizuoka, JP;
Azumi Miyaake, Kanagawa, JP;
Hiroshi Yamashita, Shizuoka, JP;
Daisuke Asahina, Shizuoka, JP;
Ryo Miyakoshi, Shizuoka, JP;
Satoyuki Sekiguchi, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A toner including a polyester resin having an amorphous polyester segment is provided. The amorphous polyester segment includes a condensation polymerization product between a carboxylic acid and an alcohol. The carboxylic acid includes both aliphatic and aromatic dicarboxylic acids. The toner deforms with a deformation rate of from 1.0% to 5.0% under a pressure of 100 gf at 40° C. and 80% RH. In a binarized image of an AFM phase image of the toner, first phase-contrast images serving as large-phase-difference portions are dispersed in second phase-contrast images serving as small-phase-difference portions, and the first phase-contrast images have a dispersion diameter of 100 nm or less. An endothermic quantity Q1 obtained in a first heating of DSC is from 10 to 50 J/g, and a ratio of an endothermic quantity obtained in the second heating Q2 to that in first heating Q1 is 0.65 or less.