Patent US4416698A successfully refreshed from Google Patents.
US4416698A
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Shaped cellulose article prepared from a solution containing cellulose dissolved in a tertiary amine N-oxide solvent and a process for making the article
Assignee: Akzona Inc
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Filing: 1980-04-03
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Granted: 1983-11-22
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Expires: 2000-04-03
Abstract
Abstract A solution containing cellulose dissolved in a tertiary amine N-oxide solvent containing a nonsolvent for cellulose such as water is shaped by extrusion or other shaping process to form a shaped cellulose fiber, rod, plate, tubing or film. The extruded shaped article is stretched in air while still a solution to impart improved physical properties thereto and the cellulose is precipitated from the shaped solution to set the properties without additional drawing. The solution may be prepared by dissolving cellulose in the tertiary amine N-oxide solvent in the barrel of an extrusion apparatus, extending the solution, orienting by stretching the resulting product in air while still a solution and then precipitating the cellulose from the shaped article before significant degradation of the cellulose. The cellulose and tertiary amine N-oxide may be ground to substantially the same particle size before charging the extruder barrel. The tertiary amine N-oxide is recovered and recycled to avoid environmental pollution problems. The resulting cellulose fibers or films can be used to make fabrics, wrapping or packaging materials or non-woven products.
Inventors
- 👤 Clarence C. McCorsley, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:42
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/096; D; D01; D01F; D01F2/00; C08J2301/00; C08J2301/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
71 words
A shaped cellulose article which has been formed by a process which comprises shaping a solution containing cellulose dissolved in a solvent therefor which contains a tertiary amine N-oxide solvent for cellulose and a nonsolvent for cellulose which is miscible with the tertiary amine N-oxide solvent, stretching the resulting shaped solution and then precipitating the cellulose from said resulting shaped solution to form said shaped cellulose article having improved physical properties.
Claim 2
Dependent Claim
71 words
A shaped cellulose article which has been formed by a process which comprises shaping a solution containing cellulose dissolved in a solvent therefor which contains a tertiary amine N-oxide solvent for cellulose and a nonsolvent for cellulose which is miscible with the tertiary amine N-oxide solvent, stretching the resulting shaped solution and then precipitating the cellulose from said resulting shaped solution to form said shaped cellulose article having improved physical properties.
Claim 3
Dependent Claim
18 words
The product of claim 1 having a wet modulus of at least about 7 gpd at 5% elongation.
Claim 4
Dependent Claim
15 words
The product of claim 1 having a conditioned tenacity of at least about 1.4 gpd.
Claim 5
Dependent Claim
63 words
A shaped cellulose article which has been formed by a process which comprises shaping a solution containing cellulose dissolved in a solvent therefor which contains a tertiary amine N-oxide solvent for cellulose and a nonsolvent for cellulose which is miscible with the tertiary amine N-oxide solvent, and shaped cellulose article having a wet modulus of at least about 7 gpd at 5% elongation.
Claim 6
Dependent Claim
63 words
A shaped cellulose article which has been formed by a process which comprises shaping a solution containing cellulose dissolved in a solvent therefor which contains a tertiary amine N-oxide solvent for cellulose and a nonsolvent for cellulose which is miscible with the tertiary amine N-oxide solvent, and shaped cellulose article having a wet modulus of at least about 7 gpd at 5% elongation.
Claim 7
Dependent Claim
60 words
A shaped cellulose article which has been formed by a process which comprises shaping a solution containing cellulose dissolved in a solvent therefor which contains a tertiary amine N-oxide solvent for cellulose and a nonsolvent for cellulose which is miscible with the tertiary amine N-oxide solvent, said shaped cellulose article having a conditioned tenacity of at least about 1.4 gpd.
Claim 8
Dependent Claim
60 words
A shaped cellulose article which has been formed by a process which comprises shaping a solution containing cellulose dissolved in a solvent therefor which contains a tertiary amine N-oxide solvent for cellulose and a nonsolvent for cellulose which is miscible with the tertiary amine N-oxide solvent, said shaped cellulose article having a conditioned tenacity of at least about 1.4 gpd.
Claim 9
Dependent Claim
15 words
The product of claim 4 having a conditioned tenacity of at least about 1.4 gpd.
Claim 10
Dependent Claim
16 words
The product of claim 1 stretched at a spin stretch ratio of greater than about 3.
Claim 11
Dependent Claim
15 words
The product of claim 7 having a conditioned tenacity of at least about 1.4 gpd.
Claim 12
Dependent Claim
15 words
The product of claim 7 having a wet tenacity of at least about 0.5 gpd.
Claim 13
Dependent Claim
16 words
The product of claim 7 having a conditioned tenacity from about 1.4 to about 4.7 gpd.
Claim 14
Dependent Claim
16 words
The product of claim 7 having a wet tenacity of about 0.5 to about 3.7 gpd.
Claim 15
Dependent Claim
19 words
The product of claim 7 having a wet modulus from about 7 to about 28 gpd at 5% elongation.
Claim 16
Dependent Claim
12 words
The shaped article of claim 1 in the form of a fiber.
Claim 17
Dependent Claim
12 words
The shaped article of claim 1 in the form of a film.
Claim 18
Dependent Claim
63 words
A cellulose fiber or film prepared by spinning a solution containing cellulose into a nonprecipitating fluid medium, stretching the resulting filament in said medium while still a solution to orient the cellulose molecules and thereafter precipitating the cellulose with a nonsolvent for cellulose to set the physical properties, said fiber or film having a conditioned elongation about equal to its elongation while wet.
Claim 19
Dependent Claim
63 words
A cellulose fiber or film prepared by spinning a solution containing cellulose into a nonprecipitating fluid medium, stretching the resulting filament in said medium while still a solution to orient the cellulose molecules and thereafter precipitating the cellulose with a nonsolvent for cellulose to set the physical properties, said fiber or film having a conditioned elongation about equal to its elongation while wet.
Claim 20
Dependent Claim
126 words
A cellulose fiber which has been formed by spinning a solution containing cellulose dissolved in a solvent therefor, said solvent containing a tertiary amine N-oxide solvent for cellulose and a non-solvent for cellulose which is miscible with the tertiary amine N-oxide, stretching the resulting filament at a spin-stretch ratio of at least 3 to 1 while the cellulose is still dissolved in the said solvent to orient the molecules and to improve the physical properties of the resulting fiber, and thereafter precipitating the cellulose from the filament to form a fiber having a wet modulus of at least about 7 gpd at 5% elongation, a conditioned tenacity of at least about 1.4 gpd and a wet elongation which is about equal to the fiber's conditioned elongation.
Claim 21
Dependent Claim
126 words
A cellulose fiber which has been formed by spinning a solution containing cellulose dissolved in a solvent therefor, said solvent containing a tertiary amine N-oxide solvent for cellulose and a non-solvent for cellulose which is miscible with the tertiary amine N-oxide, stretching the resulting filament at a spin-stretch ratio of at least 3 to 1 while the cellulose is still dissolved in the said solvent to orient the molecules and to improve the physical properties of the resulting fiber, and thereafter precipitating the cellulose from the filament to form a fiber having a wet modulus of at least about 7 gpd at 5% elongation, a conditioned tenacity of at least about 1.4 gpd and a wet elongation which is about equal to the fiber's conditioned elongation.
Claim 22
Dependent Claim
17 words
The fiber of claim 16 wherein the spinning, stretching and precipitation follow each other without substantial interruption.
References Cited (Backward Citations)
CH191822A
Cited
US2179181A
Cited
US3277226A
Cited
US3447939A
Cited
US3508941A
Cited
US3488344A
Cited
US3503700A
Cited
US3842151A
Cited
US4028132A
Cited
US4142913A
Cited
US4144080A
Cited
US4211574A
Cited
US4145532A
Cited
US4196282A
Cited
US4278790A
Cited
US4324593A
Cited
US4246221A
Cited
US4290815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |