Cyan ink and ink set

(54) CYAN INK AND INK SET

(75) Inventors: Masashi Tsujimura, Kawasaki (JP);

Mikio Sanada, Yokohama (JP);
Yasuhiro Nito, Yokohama (JP);
Sadayuki Sugama, Tsukuba (JP)

(73) Assignee: Canon Kabushiki Kaisha, Tokyo (JP)

( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

This patent is subject to a terminal disclaimer.

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(Continued) FOREIGN PATENT DOCUMENTS JP 10-279869 10/1998

(21) Appl. No.: 11/313,806

(22) Filed: Dec. 22, 2005

(65) Prior Publication Data

US 2006/0096498 Al May 11, 2006

Related U.S. Application Data

(63) Continuation of application No. PCT/JP2005/ 012295, filed on Jun. 28, 2005.

(30) Foreign Application Priority Data

Jun. 28, 2004 (JP) 2004-190545

(51) Int. CI.

C09D 11/02 (2006.01)

(52) U.S. CI 106/31.27; 106/31.6

(58) Field of Classification Search 106/31.27,

106/31.6

See application file for complete search history. (56) References Cited

U.S. PATENT DOCUMENTS 5,451,251 A 9/1995 Mafune et al 106/22 H

(Continued)

Primary Examiner—J. A. Lorengo

Assistant Examiner—Veronica Faison-Gee

(74) Attorney, Agent, or Firm—Fitzpatrick, Cella, Harper &

Scinto

(57) ABSTRACT

A cyan ink applicable to an ink set has plurality of aqueous inks each containing at least: water; a water-insoluble coloring material; and plurality of water-soluble organic solvents including a good medium or good mediums for the water-insoluble coloring material and a poor medium or poor mediums for the water-insoluble coloring material. A ratio of a poor medium to a good medium in the cyan ink is in a specific range. A water-soluble organic solvent showing the maximum Ka value out of respective Ka values of the plurality of water-soluble organic solvents is the poor medium. A ratio of a poor medium to a good medium in an arbitrary aqueous ink in the ink set except the cyan ink and the ratio of the poor medium to the good medium in the cyan ink satisfy a specific relationship.

5 Claims, 8 Drawing Sheets

Page 2

U.S. PATENT DOCUMENTS

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