EP0733682A1
Expired / Lapsed
EP
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Process for producing aqueous pigment ink
Assignee: Orient Chemical Industries Ltd
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Filing: 1996-03-19
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Granted: —
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Expires: 2016-03-19
Abstract
Abstract The present invention provides a process for producing aqueous pigment ink which forms a black matrix having high optical density, excellent flatness of a film and low conductivity, and imparts high resolution power to a color filter. The process comprises the steps of: finely dispersing a carbon black having an oil absorptivity of not more than 100 ml/100 g in an aqueous medium; and oxidizing the carbon black by using a hypohalite.
Inventors
- 👤 Toshiyuki Nagasawa
- 👤 Tetsuji Kihara
- 👤 Sohko Itoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 09:32
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/324; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C09D11/16; C09D11/17; C09D5/00; C09D5/44; C09D5/448; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/19
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
A process for producing aqueous pigment ink, comprising the steps of: finely dispersing a carbon black having an oil absorptivity of not more than 100 ml/100 g in an aqueous medium; and oxidizing the carbon black by using hypohalite.
Claim 2
Dependent Claim
26 words
The process according to claim 1, wherein the carbon black is finely dispersed in the aqueous medium in an amount of 0.5 to 50% by weight.
Claim 3
Dependent Claim
31 words
The process according to claim 1 or 2, wherein the carbon black is finely dispersed so that it has an particle size of not more than 150 nm in an average.
Claim 4
Dependent Claim
19 words
The process according to any of claims 1 to 3, wherein the hypohalite is sodium hypochlorite or potassium hypochlorite.
Claim 5
Dependent Claim
33 words
The process according to any of claims 1 to 4, wherein the hypohalite is used in an amount of 1.5 to 75% by weight based on 100% by weight of the carbon black,
Claim 6
Dependent Claim
13 words
Aqueous pigment ink obtainable by any one process of claims 1 to 5.
Claim 7
Dependent Claim
22 words
A coating composition for forming a black matrix, which comprises the aqueous pigment ink according to claim 6 and a film-forming resin.
Claim 8
Dependent Claim
51 words
The coating composition for forming a black matrix according to claim 7, wherein the film-forming resin is selected from an acrylic resin, a methacrylic acid derivative resin, a polyester resin, a malated oil resin, an amine-modified acrylic resin, an amine-modified epoxy resin, an amine-modified polybutadiene resin and an amine-modified polyurethanepolyol resin.
Claim 9
Dependent Claim
28 words
A process for forming a black matrix comprising a step of electrodepositing the coating composition according to claim 7 or 8 on an electrode placed on a substrate.
Claim 10
Dependent Claim
16 words
An ink composition for ink-jet recording, which comprises the aqueous pigment ink according to claim 6.
Claim 11
Dependent Claim
15 words
A coating composition for writing, which comprises the aqueous pigment ink according to claim 6.
References Cited (Backward Citations)
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