Invention Grant
- Patent Title: Pigment dispersion, water-based pigment dispersion liquid, and inkjet recording ink and method for producing water-based pigment dispersion liquid
- Patent Title (中): 颜料分散体,水性颜料分散液和喷墨记录油墨以及水性颜料分散液的制造方法
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Application No.: US13421493Application Date: 2012-03-15
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Publication No.: US08349922B2Publication Date: 2013-01-08
- Inventor: Satoshi Idemura , Hiroshi Maru , Kenji Sugo
- Applicant: Satoshi Idemura , Hiroshi Maru , Kenji Sugo
- Applicant Address: JP Tokyo
- Assignee: DIC Corporation
- Current Assignee: DIC Corporation
- Current Assignee Address: JP Tokyo
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JP2009-214370 20090916
- Main IPC: C09D11/00
- IPC: C09D11/00 ; C09D133/02

Abstract:
A yellow water-based pigment dispersion liquid is provided that includes pigment particles dispersed with a significantly small particle size, that has excellent dispersion stability, that causes less precipitation even at low viscosity, and that provides high gloss when the dispersion liquid is used as a main component of inkjet recording ink. In order to produce the water-based pigment dispersion liquid, it is important to add, as a kneading aid, an acetylene glycol surfactant having a specific structure and an HLB value of 8 to 12 to a mixture containing a bis-acetoacetallylide pigment, a styrene-acrylic acid copolymer having an acid value of 145 to 175, a basic compound, and a humectant and then to knead the resultant mixture to obtain a pigment dispersion. By dispersing the pigment dispersion in a water-based medium, a water-based pigment dispersion liquid for inkjet recording having the characteristics above can be produced.
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