US5928419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface-treated organic pigment and process for the production thereof
Assignee: Artience Co Ltd
•
Filing: 1997-10-06
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Granted: 1999-07-27
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Expires: 2017-10-06
Abstract
Abstract A surface-treated organic pigment excellent in initial dispersibility and long-term dispersion stability in water and an organic solvent and free from the coagulation of pigment particles, obtained by reacting a sulfonating agent with an organic pigment dispersed in a solvent in which the organic pigment is insoluble or sparingly soluble, and thereby introducing a sulfonic acid group to the surface of each particle of the organic pigment.
Inventors
- 👤 Toshiyuki Uemura
- 👤 Tsukasa Iguchi
- 👤 Sunao Satake
- 👤 Hisashi Uraki
- 👤 Yasuharu Iida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:28
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09B; C09B67/00; C09B67/0001; C09B67/0004; C09B67/0033
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
48 words
A process for the production of a surface-treated organic pigment, which comprises reacting a sulfonating agent selected from sulfamic acid or pyridine sulfur trioxide complex with an organic pigment dispersed in sulfolane, and thereby introducing sulfonic acid groups to the surface of each particle of the organic pigment.
Claim 2
Dependent Claim
48 words
A process for the production of a surface-treated organic pigment, which comprises reacting a sulfonating agent selected from sulfamic acid or pyridine sulfur trioxide complex with an organic pigment dispersed in sulfolane, and thereby introducing sulfonic acid groups to the surface of each particle of the organic pigment.
Claim 3
Dependent Claim
31 words
The process according to claim 1, wherein the organic pigment is a product prepared by finely dispersing coagulated particles of the organic pigment with a milling machine or a dispersing machine.
Claim 4
Dependent Claim
30 words
The process according to claim 2, wherein the coagulated particles of the organic pigment are finely dispersed by means of a shear stress or an impact force caused by media.
Claim 5
Dependent Claim
34 words
The process according to claim 1, wherein the organic pigment is reacted with the sulfonating agent while coagulated particles of the organic pigment are finely dispersed with a milling machine or a dispersing machine.
Claim 6
Dependent Claim
33 words
The process according to claim 1, wherein the organic pigment to be dispersed in the solvent is a water-wetted pigment paste obtained without drying the organic pigment after the organic pigment is synthesized.
Claim 7
Dependent Claim
30 words
The process according to claim 5, wherein the water-wetted pigment paste dispersed in the solvent is reacted with the sulfonating agent after water is eliminated from the water-wetted pigment paste.
Claim 8
Dependent Claim
24 words
The process according to claim 5, wherein the water-wetted pigment paste is a paste of a pigment finely milled by a salt milling treatment.
Claim 9
Dependent Claim
36 words
A surface-treated organic pigment produced by the process of claim 6 which substantially has no sulfonic acid group inside each particle thereof and has a sulfonic acid group only on the surface of each particle thereof.
Claim 10
Dependent Claim
22 words
A dispersion comprising a surface-treated organic pigment, obtained by dispersing the surface-treated organic pigment recited in claim 8 in a water-based liquid.
Claim 11
Dependent Claim
27 words
The dispersion according to claim 9, wherein the surface-treated organic pigment has an average particle diameter, measured by a laser scatter method, of 10 to 150 nm.
Claim 12
Dependent Claim
16 words
An ink-jet recording liquid comprising the dispersion of a surface-treated organic pigment recited in claim 9.
Claim 13
Dependent Claim
35 words
The ink-jet recording liquid according to claim 11, wherein the inkjet recording liquid contains 0.1 to 10 parts by weight, per 100 parts by weight of the inkjet recording liquid, of the surface-treated organic pigment.
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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) | 2002-07-26 | 2003-01-25 | 2003-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-26 | 2007-01-25 | 2007-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-26 | 2011-01-25 | 2011-07-27 | $7700.00 | Window Closed / Lapsed |