AQUEOUS PIGMENT DISPERSION, AQUEOUS INK AND METHOD FOR PRODUCING AQUEOUS PIGMENT DISPERSION

Japanese Patent JP2007186569

A

To provide aqueous ink which excels in dispersion stability and has high color development in plain paper, and furthermore an aqueous pigment dispersion for the ink.

The aqueous pigment dispersion comprises one or more (meth)acrylic copolymers (B) obtained by polymerizing a polymerizable monomer composition containing not less than 95 mass% one or more polymerizable monomers having solubility of not more than 5 mass% in the presence of particles of a (meth)acrylic copolymer (A) containing a pigment. The aqueous ink uses the aqueous pigment dispersion. A method for producing the aqueous pigment dispersion comprises a step (1) of impregnating the particles of the (meth)acrylic copolymer (A) containing a pigment with a polymerizable monomer composition containing not less than 95 mass% one or more polymerizable monomers having solubility in water at 20°C of not more than 5 mass% in the absence of a surface active agent and a step (2) of polymerizing the above polymerizable monomer composition inside the above particles of (A) in an aqueous medium.

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JP2011515535	Modified pigments with reduced phosphate release, and dispersions and inkjet ink compositions from them
JP2754244	INDUSTRIAL APPLICABILITY [Title of Invention] Paste-like pigment preparation, its production method and its use.

IKUMA TAKAHITO
ITOTANI KAZUO
KINOSHITA KOJI

JP2006004741A

July 26, 2007

January 12, 2006

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DAINIPPON INK & CHEMICALS

C09D17/00; C09D11/00

JP2003089757A	2003-03-28
JP2004203908A	2004-07-22
JPH1059825A	1998-03-03
JP2004115710A	2004-04-15
JPH1059818A	1998-03-03
JP2005307028A	2005-11-04

Kono Tsuyo

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