US4026885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of cationic hydrazone dyes
Assignee: Novartis Corp
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Filing: 1976-04-27
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Granted: 1977-05-31
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Expires: 1996-04-27
Abstract
Abstract A process for the manufacture of dyes of the formula ##STR1## WHEREIN EACH OF R 1 and R 2 represents a methyl or ethyl radical, n is 1 or 2, X - is the charge equivalent of an anion and B represents a divalent radical which completes the ring a to form a pyridinium or quinolinium ring which is unsubstituted or substituted by chlorine or methyl, and the ring b is unsubstituted or substituted by low molecular alkyl or alkoxy or by halogen, which process comprises treating a compound of the formula ##STR2## WHEREIN R 1 , n, X - , B, a and b are as defined in formula (1) and m is 1 or 2, in aqueous medium at a pH of 12 or above, with dimethyl or diethyl sulphate, with the proviso that if m=1, at least 2 equivalents of dimethyl or diethyl sulphate are used.
Inventors
- 👤 Christian Frey
- 👤 Peter Moser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:21
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/005; C09B26/00; C09B26/02; C09B26/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
150 words
A process for the manufacture of dyes of the formula ##STR8## wherein each of R 1 and R 2 represents a methyl or ethyl radical, n is 1 or 2, X - is the charge equivalent of an anion and B represents a divalent radical which completes the ring a to form a pyridinium or quinolinium ring which is unsubstituted or substituted by chlorine or methyl, and the ring b is unsubstituted or substituted by low molecular alkyl or alkoxy or by halogen, which process comprises treating a compound of the formula ##STR9## wherein R 1 , n, X - , B, a and b are as defined in formula (1) and m is 1 or 2, in aqueous medium at a pH of 12 or above, with dimethyl or diethyl sulphate, with the proviso that if m= 1, at least 2 equivalents of dimethyl or diethyl sulphate are used.
Claim 2
Dependent Claim
150 words
A process for the manufacture of dyes of the formula ##STR8## wherein each of R 1 and R 2 represents a methyl or ethyl radical, n is 1 or 2, X - is the charge equivalent of an anion and B represents a divalent radical which completes the ring a to form a pyridinium or quinolinium ring which is unsubstituted or substituted by chlorine or methyl, and the ring b is unsubstituted or substituted by low molecular alkyl or alkoxy or by halogen, which process comprises treating a compound of the formula ##STR9## wherein R 1 , n, X - , B, a and b are as defined in formula (1) and m is 1 or 2, in aqueous medium at a pH of 12 or above, with dimethyl or diethyl sulphate, with the proviso that if m= 1, at least 2 equivalents of dimethyl or diethyl sulphate are used.
Claim 3
Dependent Claim
65 words
A process according to claim 1, wherein the aqueous reaction mixture which is obtained by reacting a hydrazone of the formula ##STR10## wherein n, B, a and b are as defined in claim 1, in aqueous medium at a pH of 4 to 8, with dimethyl or diethyl sulphate, is treated at a pH of 12 or above once more with dimethyl or diethyl sulphate.
Claim 4
Dependent Claim
32 words
A process according to claim 1, wherein a start is made from a compound of the formula ##STR11## wherein R 1 , m and X - are as defined in claim 1.
Claim 5
Dependent Claim
32 words
A process according to claim 1, wherein a start is made from a compound of the formula ##STR12## wherein R 1 , m and X - are as defined in claim 1.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the reaction is carried out at temperatures of at most 30° C.
Claim 7
Dependent Claim
17 words
A process according to claim 1, wherein the reaction is carried out at 0° to 22° C.
Claim 8
Dependent Claim
19 words
A process according to claim 1, wherein the process is carried out at a pH of 12 to 13.
Claim 9
Dependent Claim
22 words
A process according to claim 1, wherein the pH is adjusted by adding concentrated sodium hydroxide solution to the aqueous reaction mixture.
References Cited (Backward Citations)
AT206549B
Cited
US3635955A
Cited
US3741982A
Cited
US3829418A
Cited
US3769279A
Cited
US3897418A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |