US3973903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azomethine dye solutions
Assignee: EIDP Inc
•
Filing: 1974-03-05
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Granted: 1976-08-10
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Expires: 1994-03-05
Abstract
Abstract A process for making yellow, basic azomethine dyes for paper, leather and textiles, and concentrated, stable solutions thereof; the process being an improvement in the process of reacting an azo dye base precursor of the formula ##SPC1## Wherein A is phenyl or substituted phenyl, with dimethyl sulfate in solution, and in the presence of an acid-binding agent, THE IMPROVEMENT COMPRISING EMPLOYING AN AQUEOUS SOLUTION HAVING AT LEAST 30 WEIGHT PERCENT WATER, EMPLOYING DIMETHYL SULFATE IN A MOLAR EXCESS OF FROM 100% TO 300%, AND EMPLOYING FROM 2.0 TO 3.5 MOLES OF MAGNESIUM OXIDE AS THE ACID-BINDING AGENT PER MOLE OF PRECURSOR.
Inventors
- 👤 Ray Allen Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:13
CPC Classifications
C; C09; C09B; C09B26/00; C09B26/02; C09B26/04; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
A stable, yellow, basic azomethine dye solution comprising 5% to 50% by weight of dye, 10% to 95% by weight of at least one member selected from the group consisting of carboxylic acids of one to six carbon atoms, and water-soluble hydroxycarboxylic acids, and 0 to 40% by weight of water, the dye having the formula ##SPC2## wherein A is phenyl or phenyl substituted by 1 to 3 groups selected from C 1-4 alkyl and C 1-4 alkoxy.
Claim 2
Dependent Claim
78 words
A stable, yellow, basic azomethine dye solution comprising 5% to 50% by weight of dye, 10% to 95% by weight of at least one member selected from the group consisting of carboxylic acids of one to six carbon atoms, and water-soluble hydroxycarboxylic acids, and 0 to 40% by weight of water, the dye having the formula ##SPC2## wherein A is phenyl or phenyl substituted by 1 to 3 groups selected from C 1-4 alkyl and C 1-4 alkoxy.
Claim 3
Dependent Claim
29 words
A solution according to claim 1 comprising 20% to 40% by weight of dye, 30% to 60% by weight of solvent, and 20% to 30% by weight of water.
Claim 4
Dependent Claim
10 words
A solution according to claim 1 wherein A is phenyl.
Claim 5
Dependent Claim
10 words
A solution according to claim 1 where A is p-methoxyphenyl.
Claim 6
Dependent Claim
10 words
A solution according to claim 1 wherein A is p-ethoxyphenyl.
Claim 7
Dependent Claim
10 words
A solution according to claim 2 wherein A is phenyl.
Claim 8
Dependent Claim
10 words
A solution according to claim 2 wherein A is p-methoxyphenyl.
Claim 9
Dependent Claim
10 words
A solution according to claim 2 wherein A is p-ethoxyphenyl.
References Cited (Backward Citations)
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US3345355A
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US3133910A
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US3346322A
Cited
US3331831A
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US3503699A
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US3718642A
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US3696089A
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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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |