US4059403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dyeing wet-spun aromatic polyamides in gel form
Assignee: Bayer AG
•
Filing: 1975-08-07
•
Granted: 1977-11-22
•
Expires: 1995-08-07
Abstract
Abstract The invention relates to a process for the production of dyed filaments from aromatic polyamides which contain acid groups.
Inventors
- 👤 Gerhard Dieter Wolf
- 👤 Ralf Miessen
- 👤 Hans Egon Kunzel
- 👤 Francis Bentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:54
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605; D06; D06P; D06P1/00; D06P1/90; D06P1/92; D06P1/928; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/242; D06P7/00; D06P7/005; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/924; Y10S8/925; Y10S8/932
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
45 words
A process for the production of dyed filaments of aromatic polyamides which comprises continuously dyeing wet-spun gel filaments of an aromatic polyamide which contains acidic groups before, during, or after stretching, in an aqueous bath containing at least one water-soluble, cationic dye in dissolved form.
Claim 2
Dependent Claim
45 words
A process for the production of dyed filaments of aromatic polyamides which comprises continuously dyeing wet-spun gel filaments of an aromatic polyamide which contains acidic groups before, during, or after stretching, in an aqueous bath containing at least one water-soluble, cationic dye in dissolved form.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the aromatic polyamide further contains heterocyclic groups.
Claim 4
Dependent Claim
22 words
The process of claim 1, wherein said polyamide contains from 50 to 500 mVal of acid groups per kg of solid polyamide.
Claim 5
Dependent Claim
22 words
The process of claim 1, wherein said polyamide contains from 80 to 250 mVal of acid groups per kg of solid polyamide.
Claim 6
Dependent Claim
14 words
The process of claim 1, wherein said filament is first dyed and subsequently stretched.
Claim 7
Dependent Claim
17 words
The process of claim 1, wherein said filament is prestretched during dyeing in said aqueous dye bath.
Claim 8
Dependent Claim
24 words
The process of claim 1, wherein said aqueous dye bath contains from 0.01 to 5% by weight of said water-soluble dye in dissolved form.
Claim 9
Dependent Claim
19 words
The process of claim 1, wherein said aqueous dye bath has a temperature of from 20° to 100° C.
Claim 10
Dependent Claim
31 words
The process of claim 1, wherein said aqueous dye bath additionally contains from 1 to 40% by weight, based on the total weight of the bath, of a polar organic solvent.
Claim 11
Dependent Claim
31 words
The process of claim 9, wherein said polar organic solvent is a member selected from the group consisting of dimethyl acetamide, N-methyl pyrrolidone, dimethyl formamide and hexamethyl phosphoric acid tris amide.
Claim 12
Dependent Claim
13 words
The process of claim 1, wherein said polyamide is an acid-modified poly-m-phenylene isophthalamide.
Claim 13
Dependent Claim
18 words
The process of claim 1, wherein said polyamide is an acid-modified heterocyclic polyamide corresponding to the formula ##STR5##
Claim 14
Dependent Claim
21 words
The process of claim 1, wherein said polyamide is modified by co-condensation with a comonomer containing sulphonate groups or disulphimide groups.
References Cited (Backward Citations)
US2558733A
Cited
US3111357A
Cited
US3242243A
Cited
US3233019A
Cited
US3483576A
Cited
BE708043A
Cited
US3506990A
Cited
US3543359A
Cited
US3602966A
Cited
US3888821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |