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:
Jul. 02, 2013
Filed:
Jan. 18, 2011
Takashi Saito, Yokohama, JP;
Fumiaki Fujioka, Kawasaki, JP;
Hiromitsu Kishi, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An ink containing a plurality of polymers and carbon black, wherein the plurality of polymers include a polymer A having an acid value of 200 mgKOH/g or more and 300 mgKOH/g or less and a polymer B having an acid value of 80 mgKOH/g or more and 180 mgKOH/g or less, the weight average molecular weight of the polymer A is larger than the weight average molecular weight of the polymer B, the carbon black has a DBP oil absorption of 75 mL/100 g or less and a specific surface area of 200 m/g or more, and each of -Ph-(CH)—NHand -Ph-(CH)—NH—R serving as a functional group is bonded to surfaces of the carbon black particles, wherein in these formulae, Ph represents a phenylene group, n represents an integer of 0 to 2, and R represents the polymer A.