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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.:

US 11746247 B1

PDFFull Text
Date of Patent:
Sep. 05, 2023

Filed:

Mar. 17, 2020

Aqueous pigment dispersion liquid

Applicant:

Dainichiseika Color & Chemicals Mfg. Co., Ltd., Tokyo, JP;

Inventors:

Yosuke Sakai, Tokyo, JP;

Misaki Narita, Tokyo, JP;

Yasuhiro Yoshida, Tokyo, JP;

Shinichiro Aoyagi, Tokyo, JP;

Yoshikazu Murakami, Tokyo, JP;

Hiroyuki Shimanaka, Tokyo, JP;

Assignee:

DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD., Tokyo, JP;

Attorney:

Hamre, Schumann, Mueller & Larson, P.C.

Primary Examiner:

Satya B Sastri

Int. Cl.
CPC ...
C09D 17/00 (2006.01); C08F 220/18 (2006.01); C08F 220/14 (2006.01); C08F 220/34 (2006.01); C08F 226/06 (2006.01); C08K 5/00 (2006.01); C09B 67/46 (2006.01); C08G 65/08 (2006.01); C08G 65/333 (2006.01); G03G 9/08 (2006.01);
U.S. Cl.
CPC ...
C09D 17/001 (2013.01); C08F 220/14 (2013.01); C08F 220/1804 (2020.02); C08F 220/1807 (2020.02); C08F 220/34 (2013.01); C08F 226/06 (2013.01); C08G 65/08 (2013.01); C08G 65/33303 (2013.01); C08K 5/0041 (2013.01); C09B 67/009 (2013.01); C09D 17/003 (2013.01); G03G 9/0806 (2013.01); C08K 2201/003 (2013.01);
Abstract

The present invention provides an aqueous pigment dispersion liquid being such that a pigment is finely dispersed, and the viscosity, and the particle diameters of the pigment are unlikely to fluctuate, being excellent in storage stability, and enabling preparation of an emulsion-polymerized toner having properly controlled particle diameters while improving the pigment utilization rate. The aqueous pigment dispersion liquid is an aqueous pigment dispersion liquid for an emulsion-polymerized toner containing a pigment, a dispersant, and an aqueous medium. The dispersant is a polymer containing a constitutional unit (A) derived from a monomer (A) such that a group containing a (meth)acryloyloxy group or the like is bonded to one end of a particular polyethylene glycol chain or the like, and a constitutional unit (B) derived from a monomer (B) having a carboxy group or the like, the polymer has a number average molecular weight in terms of polystyrene of 4,000 to 15,000, as measured by gel permeation chromatography, the polymer is contained in a state of being not ionized substantially, and the aqueous pigment dispersion liquid has a pH of 3.0 to 8.4.

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