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US5609671A
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Water-based pigment ink and process for producing the same
Assignee: Orient Chemical Industries Ltd
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Filing: 1995-12-01
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Granted: 1997-03-11
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Expires: 2015-12-01
Abstract
Abstract Water-based pigment ink having high concentration which provides excellent jetting stability when using for ink-jet printer and provides excellent writing stability when using for fine-point pen was provided. The water-based pigment ink comprises water and carbon black, wherein said carbon black has a surface active hydrogen content of not less than 1.5 mmol/g.
Inventors
- 👤 Toshiyuki Nagasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:47
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/324; C09D11/16; C09D11/17
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
24 words
Water-based pigment ink comprising water and carbon black, wherein said carbon black has a surface active hydrogen content of not less than 1.5 mmol/g.
Claim 2
Dependent Claim
24 words
Water-based pigment ink comprising water and carbon black, wherein said carbon black has a surface active hydrogen content of not less than 1.5 mmol/g.
Claim 3
Dependent Claim
24 words
The water-based pigment ink according to claim 1, wherein the carbon black has a surface active hydrogen content of not less than 2.0 mmol/g.
Claim 4
Dependent Claim
33 words
The water-based pigment ink according to claim 1, wherein the carbon black is contained in an amount of 0.1 to 50% by weight based on the total weight of the water-based pigment ink.
Claim 5
Dependent Claim
33 words
The water-based pigment ink according to claim 1, wherein the carbon black is contained in an amount of 1 to 20% by weight based on the total weight of the water-based pigment ink.
Claim 6
Dependent Claim
23 words
The water-based pigment ink according to claim 1, wherein the average particle size of the carbon black is not more than 200 nm.
Claim 7
Dependent Claim
23 words
The water-based pigment ink according to claim 1, wherein the average particle size of the carbon black is not more than 100 nm.
Claim 8
Dependent Claim
36 words
The water-based pigment ink according to claim 1, wherein said carbon black contains carboxyl groups on the surface thereof and at least a part of said carboxyl groups forms carboxylic acid salt with an alkali metal.
Claim 9
Dependent Claim
33 words
A process for producing a pigment suitable for water-based pigment ink comprising the steps of: (a) providing acidic carbon black; and (b) oxidizing the acidic carbon black with a hypohalite salt in water.
Claim 10
Dependent Claim
33 words
A process for producing a pigment suitable for water-based pigment ink comprising the steps of: (a) providing acidic carbon black; and (b) oxidizing the acidic carbon black with a hypohalite salt in water.
Claim 11
Dependent Claim
24 words
The process for producing water-based pigment ink according to claim 8, wherein the acidic carbon black has a pH of not more than 6.
Claim 12
Dependent Claim
24 words
The process for producing water-based pigment ink according to claim 8, wherein the acidic carbon black has a pH of not more than 4.
Claim 13
Dependent Claim
27 words
The process for producing water-based pigment ink according to claim 8, wherein the hypohalite salt is selected from the group consisting of sodium hypochlorite and potassium hypochlorite.
Claim 14
Dependent Claim
39 words
The process for producing water-based pigment ink according to claim 8, further comprising the step of: (c) washing with water; and (d) purifying and concentrating with a separation membrane having a pore diameter of not more than 0.01 μm.
Claim 15
Dependent Claim
36 words
The process for producing a pigment suitable for water-based pigment ink according to claim 8, wherein the step (b) for oxidizing the acidic carbon black, is conducted at a temperature of not less than 50° C.
Claim 16
Dependent Claim
33 words
The process for producing a pigment suitable for water-based pigment ink according to claim 13, wherein the resulting oxidized carbon black has a surface active hydrogen content of not less than 1.5 mmol/g.
Claim 17
Dependent Claim
59 words
The water-based pigment ink according to claim 1, wherein said carbon black (a) has a surface active hydrogen content of not less than 2.0 mmol/g; (b) is contained in an amount of 1 to 20% by weight based on the total weight of the water-based pigment; and (c) has an average particle size of not more than 200 nm.
Claim 18
Dependent Claim
23 words
The water-based pigment ink according to claim 2, wherein the average particle size of the carbon black is not more than 200 nm.
Claim 19
Dependent Claim
23 words
The water-based pigment ink according to claim 2, wherein the average particle size of the carbon black is not more than 100 nm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-10 | 2000-09-09 | 2001-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-10 | 2004-09-09 | 2005-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-10 | 2008-09-09 | 2009-03-11 | $7700.00 | Window Closed / Lapsed |