US4340389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of water-soluble dyestuffs with a low salt content
Assignee: Bayer AG
•
Filing: 1981-04-15
•
Granted: 1982-07-20
•
Expires: 2001-04-15
Abstract
Abstract Process for the preparation of water-soluble dyestuffs with a low salt content, characterized in that the water-soluble dyestuffs are salted out from their aqueous solutions and/or dispersions by adding salts which are volatile at temperatures of about 40° C. to about 250° C. under a pressure of about 10 mm Hg to about 760 mm Hg, the dyestuffs are isolated and the volatile salts are volatilized during the drying process.
Inventors
- 👤 Konrad Nonn
- 👤 Joachim Laser
- 👤 Karlheinz Wolf
- 👤 Reinhold Hornle
- 👤 Erich Istel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:43
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0096; C09B43/00; C09B43/12; C09B43/136; C09B43/14; C09B45/00; C09B45/02; C09B45/14; C09B45/16; C09B67/0001; C09B67/0003; D; D06; D06L; D06L4/00; D06L4/60; D06L4/664
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
Process for the preparation of water-soluble dyestuffs with a low salt content, characterised in that the water-soluble dyestuffs are salted out from their aqueous solutions and/or dispersions by adding ammonium salts which are volatile at temperatures of about 40° C. to about 250° C. and under a pressure of about 10 mm Hg to about 760 mm Hg, the dyestuffs are isolated and the volatile salts are volatilised during the drying process.
Claim 2
Dependent Claim
72 words
Process for the preparation of water-soluble dyestuffs with a low salt content, characterised in that the water-soluble dyestuffs are salted out from their aqueous solutions and/or dispersions by adding ammonium salts which are volatile at temperatures of about 40° C. to about 250° C. and under a pressure of about 10 mm Hg to about 760 mm Hg, the dyestuffs are isolated and the volatile salts are volatilised during the drying process.
Claim 3
Dependent Claim
44 words
Process according to claim 1, characterised in that the water-soluble dyestuffs are salted out by adding ammonium salts which are volatile at temperatures of about 60° C. to about 150° C. under a pressure of about 10 mm Hg to about 760 mm Hg.
Claim 4
Dependent Claim
28 words
Process according to claim 1 or 2, characterised in that volatile ammonium salts which still carry at least one H atom on the ammonium nitrogen atom are employed.
Claim 5
Dependent Claim
12 words
Process according to claim 1, characterised in that ammonium carbonate is employed.
Claim 6
Dependent Claim
12 words
Process according to claim 1, characterised in that ammonium carbamate is employed.
Claim 7
Dependent Claim
12 words
Process according to claim 1, characterised in that ammonium bicarbonate is employed.
Claim 8
Dependent Claim
42 words
Process according to any one of claims 5, 6 or 7, characterised in that anionic dyestuffs which contain a NH 4 .sup.⊕ cation are converted, by adding stronger bases, into the salt of the stronger base, with volatilisation of NH 3 .
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |