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:
Jan. 11, 2011
Filed:
Feb. 01, 2008
Junichi Sakai, Machida, JP;
Kousuke Yamasaki, Kawasaki, JP;
Katsuhiko Suzuki, Tokyo, JP;
Itaru Tsuji, Kawasaki, JP;
Aki Takano, Kawasaki, JP;
Hideki Takayama, Fujisawa, JP;
Shin-ichi Sato, Kawasaki, JP;
Junichi Sakai, Machida, JP;
Kousuke Yamasaki, Kawasaki, JP;
Katsuhiko Suzuki, Tokyo, JP;
Itaru Tsuji, Kawasaki, JP;
Aki Takano, Kawasaki, JP;
Hideki Takayama, Fujisawa, JP;
Shin-ichi Sato, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is an aqueous ink with high storage stability and scratch resistance at such a high level that the coloring material of an image is not scraped off even when lightly touched with a sharp product. The aqueous ink includes a water-insoluble coloring material and plural polymers. The plural polymers include a polymer A which relatively contributes to dispersion of the water-insoluble coloring material and a polymer B which does not relatively contribute to the dispersion of the water-insoluble coloring material compared to the polymer A. The polymer A includes a block copolymer having an acid value of 120 mgKOH/g to 180 mgKOH/g and having an ethylene oxide group as a nonionic group. The polymer B has an acid value of 150 mgKOH/g or less and a hydrogen bond parameter (δh) of the polymer obtained by solubility parameters of monomers constituting the polymer of 1.0 cal/cmor more and 3.2 cal/cmor less.