US4030880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving dyeability
Assignee: EIDP Inc
•
Filing: 1975-10-09
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Granted: 1977-06-21
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Expires: 1995-10-09
Abstract
Abstract Synthetic polycarbonamide filaments having more uniform acid dyeability are prepared in a melt-spinning and drawing process by applying a dye leveling agent to the filaments in a spin finish prior to drawing. Dye uniformity is improved with washfast, rate-sensitive acid dyes. The filaments may be processed conventionally prior to dyeing. Effective agents include sodium dodecyldiphenylether disulfonate and sulfated butyl oleate.
Inventors
- 👤 Winfried Thomas Holfeld
- 👤 Alfred John Strohmaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:22
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/241
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
In a melt-spinning and drawing process for the preparation of synthetic polycarbonamide filaments, the improvement for achieving more uniform acid dyeability comprising applying to the filaments, prior to drawing, a finish in an amount to provide from 0.05 to 0.5% by weight of the filaments of at least one dye-leveling agent containing at least 1.0 milliequivalents per gram of a sulfonic or sulfate group and selected from the group consisting of: a. aromatic sulfonic acids and their condensation products; b. sulfated derivatives of C 16 to C 22 unsaturated fatty acids and their alkyl esters; and c. alkali metal and ammonium salts of (a) and (b), and thereafter drawing the filaments containing the finish to increase their molecular orientation.
Claim 2
Dependent Claim
119 words
In a melt-spinning and drawing process for the preparation of synthetic polycarbonamide filaments, the improvement for achieving more uniform acid dyeability comprising applying to the filaments, prior to drawing, a finish in an amount to provide from 0.05 to 0.5% by weight of the filaments of at least one dye-leveling agent containing at least 1.0 milliequivalents per gram of a sulfonic or sulfate group and selected from the group consisting of: a. aromatic sulfonic acids and their condensation products; b. sulfated derivatives of C 16 to C 22 unsaturated fatty acids and their alkyl esters; and c. alkali metal and ammonium salts of (a) and (b), and thereafter drawing the filaments containing the finish to increase their molecular orientation.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the dye-leveling agent is a p-(C 8 to C 18 alkyl)- diphenylether disulfonic acid, or the ammonium or alkali metal salt thereof.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the alkyl group is dodecyl and the salt is sodium.
Claim 5
Dependent Claim
26 words
The process of claim 1 wherein the dye-leveling agent is a sulfated derivative of an unsaturated fatty ester of a C 1 to C 8 alcohol.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein the sulfated derivative is sulfated butyl oleate.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |