	US 7,393,404 B2
	Pigment dispersants and their use
Hiroaki Saikatsu, Chuo-ku (Japan); Hiromitsu Yanagimoto, Chuo-ku (Japan); Naoto Kamata, Chuo-ku (Japan); Kazuhito Ooki, Chuo-ku (Japan); Yutaka Miura, Chuo-ku (Japan); Shigeru Sakamoto, Chuo-ku (Japan); Akio Yoshida, Chuo-ku (Japan); and Michiei Nakamura, Chuo-ku (Japan)
Assigned to Dainichiseika Color & Chemicals Mfg. Co., Ltd., Tokyo (Japan)
Filed on Feb. 15, 2006, as Appl. No. 11/354,112.
Claims priority of application No. 2005-045347 (JP), filed on Feb. 22, 2005; and application No. 2005-045348 (JP), filed on Feb. 22, 2005.
Prior Publication US 2006/0185558 A1, Aug. 24, 2006
Int. Cl. G03F 1/00 (2006.01); G03F 7/09 (2006.01); B01F 17/32 (2006.01); C07D 487/02 (2006.01); C08K 5/3415 (2006.01); G02B 5/20 (2006.01); G02B 5/22 (2006.01); G02F 1/1335 (2006.01); G03C 7/04 (2006.01); C09B 67/20 (2006.01); C09B 67/00 (2006.01); C09B 67/22 (2006.01); C09B 67/46 (2006.01); C09B 57/00 (2006.01)

U.S. Cl. 106—498 [106/493; 106/494; 106/495; 106/496; 106/497; 349/106; 353/84; 430/7; 430/321; 430/322; 524/92; 544/143; 548/453]

14 Claims

1. A pigment dispersant comprising the following component (a) alone or the following components (a) and (b) in combination:

Component (a): a composite pigment formed of a diketopyrrolopyrrole pigment having a sulfonic group and another diketopyrrolopyrrole pigment having no sulfonic group, wherein the number of sulfonic group per molecule of said diketopyrrolopyrrole pigments in the composite pigment is from 0.05 to 0.5; and

Component (b): a pigment other than said component (a), wherein said pigment has a sulfonic group or a metal salt, ammonium salt or amine salt thereof.