US3742104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of shaped synthetic articles having improved dyeability
Assignee: Celanese Corp
•
Filing: 1970-05-08
•
Granted: 1973-06-26
•
Expires: 1990-05-08
Abstract
Abstract A chemical relaxation treatment for increasing dyeability of wet spun difficultly meltable filamentary material such as high melting polyamides, polyurethanes and polyureas which filaments are spun from a concentrated sulfuric acid solution and coagulated in an aqueous sulfuric acid bath. The residual sulfuric acid contained in the filamentary material is subsequently activated to increase the dyeability of the resulting product.
Inventors
- 👤 S Jamison
- 👤 J Soehngen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:04
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/04; D01F11/08; D01F6/00; D01F6/58; D01F6/60; D01F6/605
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
63 words
A method as in claim 1 wherein the aqueous sulfuric acid contained in the oriented filamentary material is activated by contacting the said filamentary material with hot, liquid polyethylene glycol represented by the general formula HOCH2(CH2OCH2)nCH2OH where n is a number such that the average molecular weight of the said polyethylene glycol is within the range of from about 500 to about 10,000.
Claim 2
Dependent Claim
15 words
The method as in claim 1 wherein the polymer is a polymer melting above 275*C.
Claim 3
Dependent Claim
13 words
The method as in claim 1 wherein the poly(polymethylene) terephthalamide is polyhexamethylene terephthalamide.
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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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |