US4020037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the spin-dyeing of polymers or copolymers of acrylonitrile
Assignee: Hoechst AG
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Filing: 1974-11-26
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Granted: 1977-04-26
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Expires: 1994-11-26
Abstract
Abstract The novel improved process of the invention for spin-dyeing of acid-modified polymers or copolymers of acrylonitrile with basic dyestuffs wherein the spinning solutions of the polymers contain the basic dyestuffs in form of their free dyestuff bases as anhydro or carbinol bases is conducted with completely transparent spinning solutions avoiding clogging and mechanical abrasion of the spinning nozzles and yields filaments and fibers which do not show matting effects but have a high tinctorial strength and good and improved fastnesses to rubbing, to light and to wet-processing.
Inventors
- 👤 Manfred Hahnke
- 👤 Theodor Papenfuhs
- 👤 Wolfgang Teige
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:27
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0041; D01F1/00; D01F1/02; D01F1/06; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
In a process of spin-drying of acid modified polymers or copolymers of acrylonitrile with vinyl compounds selected from the group consisting of vinyl chloride, vinyl fluoride, vinylidene chloride, vinyl acetate, vinylpropionate, vinyl pyridine, vinyl imidazole, vinyl pyrrolidone, vinyl alcohol, acrylic acid esters, methacrylic acid esters and acrylamides these copolymers containing at least 70% by weight of acrylonitrile and acid groups, with basic dyestuffs selected from the group consisting of the triarylmethane, indoldiarylmethane, azine, oxazine, thiazine, acridine and xanthene series, by means of spinning solutions of the polymers containing the basic dyestuff, the improvement consisting of using the dyestuff in the spinning solution in the form of its imine base or carbinol base.
Claim 2
Dependent Claim
112 words
In a process of spin-drying of acid modified polymers or copolymers of acrylonitrile with vinyl compounds selected from the group consisting of vinyl chloride, vinyl fluoride, vinylidene chloride, vinyl acetate, vinylpropionate, vinyl pyridine, vinyl imidazole, vinyl pyrrolidone, vinyl alcohol, acrylic acid esters, methacrylic acid esters and acrylamides these copolymers containing at least 70% by weight of acrylonitrile and acid groups, with basic dyestuffs selected from the group consisting of the triarylmethane, indoldiarylmethane, azine, oxazine, thiazine, acridine and xanthene series, by means of spinning solutions of the polymers containing the basic dyestuff, the improvement consisting of using the dyestuff in the spinning solution in the form of its imine base or carbinol base.
Claim 3
Dependent Claim
51 words
A process as claimed in claim 1 wherein the dyestuff used is a dyestuff of the formula ##STR28## in which R 1 is hydrogen or the radical of the formula ##STR29## in which the substituents R are identical or different and each R is hydrogen, chlorine, methyl, ethyl, methoxy or ethoxy.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |