US3972879A
Expired / Lapsed
US
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Process for isolating easily soluble basic oxazine dyestuffs and phenazine dyestuffs
Assignee: Bayer AG
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Filing: 1974-10-17
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Granted: 1976-08-03
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Expires: 1994-10-17
Abstract
Abstract Basic oxazine and phenazine dyestuffs are isolated from their solutions by adding urea or thiourea.
Inventors
- 👤 Hubertus Psaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:12
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0096; C09B17/00; C09B17/02; C09B19/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
Process for isolating oxazine dyestuffs or phenazine dyestuffs from solutions by adding urea or thiourea to said solutions in an amount of at least 1 mol of urea or thiourea per 1 mol of dyestuff and sufficient to precipitate said dyestuffs; said dyestuffs having the formula ##SPC2## in which R is hydrogen-NR 1 R 2 ; R 1 and R 2 independently of one another are hydrogen; alkyl; alkenyl; phenyl; or phenyl substituted by a non-ionic substituent or carboxyl; R 3 is hydrogen, methyl or alkoxy; R 4 is hydrogen or together with R 3 forms an aromatic radical; R 5 and R 6 independently of one another are hydrogen, alkyl or alkenyl; R 7 is hydrogen, methyl or alkoxy; X is oxygen or <N-R 8 ; R 8 is hydrogen; alkyl; alkenyl; phenyl; or phenyl substituted by a non-ionic substituent or carboxyl; An.sup.( - ) is an anion.
Claim 2
Dependent Claim
149 words
Process for isolating oxazine dyestuffs or phenazine dyestuffs from solutions by adding urea or thiourea to said solutions in an amount of at least 1 mol of urea or thiourea per 1 mol of dyestuff and sufficient to precipitate said dyestuffs; said dyestuffs having the formula ##SPC2## in which R is hydrogen-NR 1 R 2 ; R 1 and R 2 independently of one another are hydrogen; alkyl; alkenyl; phenyl; or phenyl substituted by a non-ionic substituent or carboxyl; R 3 is hydrogen, methyl or alkoxy; R 4 is hydrogen or together with R 3 forms an aromatic radical; R 5 and R 6 independently of one another are hydrogen, alkyl or alkenyl; R 7 is hydrogen, methyl or alkoxy; X is oxygen or <N-R 8 ; R 8 is hydrogen; alkyl; alkenyl; phenyl; or phenyl substituted by a non-ionic substituent or carboxyl; An.sup.( - ) is an anion.
Claim 3
Dependent Claim
13 words
The process of claim 1 in which said dyestuffs have the formula ##SPC3##
Claim 4
Dependent Claim
14 words
The process of claim 1 in which An.sup.( - ) is Cl.sup.( - ).
Claim 5
Dependent Claim
121 words
The process of claim 1 in which: R 1 and R 2 independently of one another are hydrogen, C 1 -c 4 -alkyl, C 2 -C 3 -alkenyl or phenyl; R 3 is hydrogen, methyl or C 1 -C 4 -alkoxy; R 4 is hydrogen or together with R 3 forms a fused benzene or naphthalene radical; R 5 and R 6 independently of one another are hydrogen, C 1 -c 4 -alkyl or C 2 -C 3 - alkenyl; R 7 is hydrogen, methyl or C 1 -C 4 -alkoxy; X is O or <N-R 8 ; R 8 is hydrogen, C 1 -C 4 -alkyl, C 2 -C 3 -alkenyl or phenyl; and An.sup.( - ) is an anion.
Claim 6
Dependent Claim
32 words
The process of claim 1 in which said dyestuff solution comprises said dyestuff and a polar organic solvent and up to 30% by weight of water based on the polar organic solvent.
Claim 7
Dependent Claim
10 words
The process of claim 1 in which X is O.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |