Patent US4224221A successfully refreshed from Google Patents.
US4224221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modifier composition for azo pigments based on 2-hydroxy-3-naphthoic acid
Assignee: Wyeth Holdings LLC
•
Filing: 1979-01-05
•
Granted: 1980-09-23
•
Expires: 1999-01-05
Abstract
Abstract The use of alpha-substituted-2-hydroxy-3-naphthoic acids to replace part of the conventional 2-hydroxy-3-naphthoic acid coupling component results in improved azo dyes.
Inventors
- 👤 David R. Burley
- 👤 Christopher J. Brookes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:11
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0033; C09B67/0046; C09B67/0051; C09B29/00; C09B29/10; C09B29/103; C09B29/106
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
In a process for the preparation of an azo pigment whereby the diazo of an aromatic aminosulfonic acid is coupled into 2-hydroxy-3-naphthoic acid, and whereby said pigment is optionally converted into the alkali metal, alkaline earth metal, or manganese salt thereof, the improvement which comprises: using as the coupling component a composition comprising from about 90 to 99 percent by weight of 2-hydroxy-3-naphthoic acid and from about 1 to 10 percent by weight of an alpha substituted-2-hydroxy-3-naphthoic acid.
Claim 2
Dependent Claim
78 words
In a process for the preparation of an azo pigment whereby the diazo of an aromatic aminosulfonic acid is coupled into 2-hydroxy-3-naphthoic acid, and whereby said pigment is optionally converted into the alkali metal, alkaline earth metal, or manganese salt thereof, the improvement which comprises: using as the coupling component a composition comprising from about 90 to 99 percent by weight of 2-hydroxy-3-naphthoic acid and from about 1 to 10 percent by weight of an alpha substituted-2-hydroxy-3-naphthoic acid.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein said alpha substituted-2-hydroxy-3-naphthoic acid is selected from the group consisting of 1-nitro-2-hydroxy-3-naphthoic acid, 1-methyl-2-hydroxy-3-naphthoic acid, 1-chloro-2-hydroxy-3-naphthoic acid, 1-bromo-2-hydroxy-3-naphthoic acid, 2,2'-dihydroxy-3,3'-dicarboxy-1,1'-dinaphthyl, and mixtures thereof.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein said coupler component is a mixture of compounds obtained by the oxidation of 2-hydroxy-3-naphthoic acid.
Claim 5
Dependent Claim
13 words
The process of claim 5 wherein the oxidation is performed with ferric chloride.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein the oxidation is performed with ferric sultate.
Claim 7
Dependent Claim
40 words
An azo pigment whereby the diazo of an aromatic aminosulfonic acid is coupled into a composition comprising about 90 to 99 percent by weight of 2-hydroxy-3-naphthoic acid and about 1 to 10 percent by weight of an alpha substituted-2-hydroxy-3-naphthoic acid.
Claim 8
Dependent Claim
40 words
An azo pigment whereby the diazo of an aromatic aminosulfonic acid is coupled into a composition comprising about 90 to 99 percent by weight of 2-hydroxy-3-naphthoic acid and about 1 to 10 percent by weight of an alpha substituted-2-hydroxy-3-naphthoic acid.
Claim 9
Dependent Claim
29 words
The pigment of claim 6 wherein said alpha substituted-2-hydroxy-3-naphthoic acid is selected from the group consisting of 1-nitro-2-hydroxy-3-naphthoic acid, 1-methyl-2-hydroxy-3-naphthoic acid, 1-chloro-2-hydroxy-3-naphthoic acid, 1-bromo-2-hydroxy-3-naphthoic acid, 2,2'-dihydroxy-3,3'-dicarboxy-1,1'-dinaphthyl, and mixtures thereof.
Claim 10
Dependent Claim
23 words
The pigment of claim 6 wherein said alpha substituted 2-hydroxy-3-naphthoic acid is a mixture of compounds obtained by the oxidation of 2-hydroxy-3-naphthoic acid.
Claim 11
Dependent Claim
13 words
The pigment of claim 8 wherein said oxidation is performed with ferric chloride.
Claim 12
Dependent Claim
13 words
The pigment of claim 8 wherein said oxidation is performed with ferric sulfate.
References Cited (Backward Citations)
US978865A
Cited
US983486A
Cited
US1052145A
Cited
US1001458A
Cited
US1003266A
Cited
US1283231A
Cited
US3498966A
Cited
US3520870A
Cited
US4143036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |