	US 7,520,927 B2
	Liquid ink for ink jet and ink jet recording method using the ink
Hideki Yamakami, Yokohama (Japan); Hiroshi Tomioka, Tokyo (Japan); Hiroyuki Takuhara, Tokyo (Japan); and Yuuko Negishi, Tokyo (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Jan. 03, 2007, as Appl. No. 11/648,587.
Application 11/648587 is a continuation of application No. PCT/JP2006/314007, filed on Jul. 07, 2006.
Claims priority of application No. 2005-199805 (JP), filed on Jul. 08, 2005.
Prior Publication US 2007/0109378 A1, May 17, 2007
Int. Cl. C09D 11/00 (2006.01); C09D 11/02 (2006.01); B41J 2/01 (2006.01)

U.S. Cl. 106—31.47 [106/31.58; 106/31.77; 106/31.86; 347/100]

3 Claims

1. A liquid ink for ink jet comprising:

water;

a coloring material;

1,5-pentanediol; and

a humectant,

wherein the coloring material comprises at least one compound represented by the following formula (1):

where M's each represent an alkali metal or ammonium, l=0 to 2, m=1 to 3, and n=1 to 3, provided that l+m+n=3 to 4, and a substitution position of a substituent comprises 4- or 4′-position; and

wherein the liquid ink for ink jet gels or solidifies if it is left under an environment having a temperature of 25° C. and a humidity of 50% RH until substantially no change in weight occurs, and the gelled or solidified ink for ink jet liquefies after being left under an environment having a temperature of 30° C. and a humidity of 50% RH for 24 hours.