Patent EP0802247A2 successfully refreshed from Google Patents.
EP0802247A2
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Aqueous pigment ink composition
Assignee: Orient Chemical Industries Ltd
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Filing: 1997-04-21
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Granted: —
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Expires: 2017-04-21
Abstract
Abstract Disclosed is an aqueous pigment ink composition comprising water and oxidized carbon black dispersed stably in the water, wherein said oxidized carbon black is obtained by oxidizing carbon black using hypohalous acid and/or salt thereof and wherein at least a part of an acidic group existing on the surface of said oxidized carbon black associates with an amine compound to form an ammonium salt. The aqueous pigment ink composition realizes smooth printing with ink jet nozzle, and smooth writing with fine pen tip and it has sufficient density. Further, the recorded traces obtained by using the ink composition is excellent in water resistance.
Inventors
- 👤 Toshiyuki Nagasawa
- 👤 Sohko Itoh
- 👤 Yoichi Ueda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 19:12
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; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
An aqueous pigment ink composition comprising water and oxidized carbon black dispersed stably in the water, wherein said oxidized carbon black is obtained by oxidizing carbon black using hypohalous acid and/or a salt thereof and wherein at least a part of an acidic group existing on the surface of said oxidized carbon black associates with an amine compound to form an ammonium salt.
Claim 2
Dependent Claim
18 words
The aqueous pigment ink composition according to claim 1, wherein said amine compound is a water-soluble volatile amine.
Claim 3
Dependent Claim
34 words
The aqueous pigment ink composition according to claim 1 or 2, wherein said oxidized carbon black is obtained by oxidizing carbon black in the condition that the carbon black is finely dispersed in water.
Claim 4
Dependent Claim
29 words
The aqueous pigment ink composition according to any of claims 1 to 3, wherein said oxidized carbon black has an average particle size of not more than 300 nm.
Claim 5
Dependent Claim
29 words
The aqueous pigment ink composition according to any of claims 1 to 4, wherein said oxidized carbon black has an oxygen content of not less than 5.0% by weight.
Claim 6
Dependent Claim
39 words
The aqueous pigment ink composition according to any of claims 1 to 5, comprising said oxidized carbon black in an amount of from 0.1 to 50% by weight based on the total amount of the aqueous pigment ink composition.
Claim 7
Dependent Claim
18 words
The aqueous pigment ink composition according to any of claims 1 to 6, comprising no pigment dispersing agent.
Claim 8
Dependent Claim
71 words
A process for producing an aqueous pigment ink composition comprising water and oxidized carbon black dispersed stably in the water, which comprises the steps of: oxidizing carbon black in the condition that the carbon black is finely dispersed in water, using hypohalous acid and/or a salt thereof; and neutralizing at least a part of an acidic group existing on the surface of the resulting oxidized carbon black, with an amine compound.
Claim 9
Dependent Claim
15 words
The process according to claim 8, wherein said amine compound is a water-soluble volatile amine.
Claim 10
Dependent Claim
46 words
The aqueous pigment ink composition according to any of claims 1 to 7, further comprising a water-soluble resin, wherein said water-soluble resin is an acrylic polymer having a weight average molecular weight of not more than 50000 and an acid value of from 100 to 250.
Claim 11
Dependent Claim
38 words
The aqueous pigment ink composition according to claim 10, wherein said water-soluble resin is neutralized with a volatile base compound selected from the group consisting of ammonia, amine, alkanolamine and alkylalkanolamine, and is dissolved in an aqueous medium.
Claim 12
Dependent Claim
36 words
The aqueous pigment ink composition according to claim 10 or 11, comprising said water-soluble resin in an amount of from 0.1 to 20% by weight based on the total amount of the aqueous pigment ink composition.
Claim 13
Dependent Claim
25 words
An ink composition for ink jet recording which comprises the aqueous pigment ink composition of any of claims 1 to 7 and 10 to 12.
Claim 14
Dependent Claim
25 words
An ink composition for a writing implement which comprises the aqueous pigment ink composition of any of claims 1 to 7 and 10 to 12.
References Cited (Backward Citations)
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