US4418026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for spinning cellulose ester fibres
Assignee: Akzo Nobel UK PLC
•
Filing: 1981-05-06
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Granted: 1983-11-29
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Expires: 2001-05-06
Abstract
Abstract Cellulose ester fibres are dry-spun from a solution in an aliphatic carboxylic acid, which solution may comprise the product liquor of the carboxylation reaction used to form the cellulose ester. Spinnability is achieved by incorporating an organic fibre-forming carrier polymer such as poly(ethylene oxide) in the spinning dope. The process may be used to spin cellulose acetate fibres and is economical in avoiding the use of conventional acetate solvents and the various purification stages usually required after the acetate is formed by acetylation. Blow-spinning or centrifugal spinning may be used to spin fine fibres.
Inventors
- 👤 Merrick S. Blackie
- 👤 John R. Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:53
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/24; D01F2/28; D01F2/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A process for spinning fibers of a cellulose ester which comprises using as the spinning dope the product liquor from the carboxylation reaction used to prepare the cellulose ester, adding to said dope not more than about 5 percent, by weight, of another fiber-forming polymer which is soluble or dispersible in said dope to improve the spinnability of said dope, and dry spinning said dope to form fibers.
Claim 2
Dependent Claim
68 words
A process for spinning fibers of a cellulose ester which comprises using as the spinning dope the product liquor from the carboxylation reaction used to prepare the cellulose ester, adding to said dope not more than about 5 percent, by weight, of another fiber-forming polymer which is soluble or dispersible in said dope to improve the spinnability of said dope, and dry spinning said dope to form fibers.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1 in which the cellulose ester is cellulose acetate and the carboxylic acid is acetic acid.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 2 in which the concentration of cellulose acetate in the product liquor is in the range from 15 to 25 percent by weight.
Claim 5
Dependent Claim
25 words
A process as claimed in claim 1 in which the other organic polymer is a linear polymer which is soluble in the carboxylic acid solution.
Claim 6
Dependent Claim
15 words
A process as claimed in claim 4 in which the linear polymer is poly(ethylene oxide).
Claim 7
Dependent Claim
17 words
A process as claimed in claim 1 in which the dope is dry-spun by a blow-spinning process.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 1 in which the dope is dry-spun by a centrifugal spinning process.
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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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |