US4367191A
Expired / Lapsed
US
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Preparation of cellulose films or fibers from cellulose solutions
Assignee: RESEARCH Corp 405 LEXINGTON AVE NEW YORK NY 10174 A NOT-FOR-PROFIT CORP OF NY
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Filing: 1981-03-25
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Granted: 1983-01-04
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Expires: 2001-03-25
Abstract
Abstract A method of forming a cellulose fiber which comprises dissolving cellulose in a solvent comprising ammonia and a salt and subsequently forming a fiber.
Inventors
- 👤 John A. Cuculo
- 👤 Samuel M. Hudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:49
CPC Classifications
C; C08; C08B; C08B16/00; C08B1/00; C08B1/003; D; D01; D01F; D01F2/00; D01F2/02
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
56 words
A method of forming a cellulose fiber which comprises dissolving cellulose in a solvent comprising ammonia and a salt selected from the group consisting of ammonium iodide, ammonium nitrate, ammonium perchlorate, ammonium thiocyanate, sodium iodide, sodium nitrate, sodium perchlorate, and sodium thiocyanate and subsequently forming a fiber by wet spinning said cellulose and coagulating the cellulose.
Claim 2
Independent Claim
56 words
A method of forming a cellulose fiber which comprises dissolving cellulose in a solvent comprising ammonia and a salt selected from the group consisting of ammonium iodide, ammonium nitrate, ammonium perchlorate, ammonium thiocyanate, sodium iodide, sodium nitrate, sodium perchlorate, and sodium thiocyanate and subsequently forming a fiber by wet spinning said cellulose and coagulating the cellulose.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said solvent contains about 20-50 wt. % ammonia.
Claim 4
Dependent Claim
16 words
The method of claim 2, wherein said solvent contains about 50-80 wt. % of said salt.
Claim 5
Dependent Claim
18 words
The method of claim 1, wherein up to 20 w/v % of cellulose is dissolved in said solvent.
Claim 6
Dependent Claim
17 words
The method of claim 4, wherein from 2-14 w/v % of cellulose is dissolved in said solvent.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein said coagulation is accomplished in a bath comprising water, acetic acid, sulfuric acid, or methanol.
Claim 8
Dependent Claim
15 words
The method of claim 1, wherein said solvent contains up to 8 wt. % water.
Claim 9
Independent Claim
50 words
A method of forming cellulose films which comprises dissolving cellulose in a solvent comprising ammonia and a salt selected from the group consisting of ammonium iodide, ammonium nitrate, ammonium perchlorate, ammonium thiocyanate, sodium iodide, sodium nitrate, sodium perchlorate, and sodium thiocyanate and subsequently casting a film on a coagulation bath.
Claim 10
Independent Claim
50 words
A method of forming cellulose films which comprises dissolving cellulose in a solvent comprising ammonia and a salt selected from the group consisting of ammonium iodide, ammonium nitrate, ammonium perchlorate, ammonium thiocyanate, sodium iodide, sodium nitrate, sodium perchlorate, and sodium thiocyanate and subsequently casting a film on a coagulation bath.
Claim 11
Dependent Claim
14 words
The method of claim 8, wherein said solvent comprises about 20-50 wt. % ammonia.
Claim 12
Dependent Claim
16 words
The method of claim 9, wherein said solvent comprises about 50-80 wt. % of said salt.
Claim 13
Dependent Claim
19 words
The method of claim 8, wherein up to 20 w/v % of said cellulose is dissolved in said solvent.
Claim 14
Dependent Claim
17 words
The method of claim 8, wherein said coagulation bath comprises water, acetic acid, sulfuric acid or methanol.
Claim 15
Independent Claim
87 words
A method of forming cellulose fibers or films which comprises: (a) dissolving cellulose in an ammonia-solvent comprising ammonia and a salt selected from the group consisting of ammonium iodide, ammonium nitrate, ammonium perchlorate, ammonium thiocyanate, sodium iodide, sodium nitrate, sodium perchlorate, and sodium thiocyanate; (b) admixing with the resulting ammonia-solvent cellulose solution a solvent which is capable of maintaining cellulose in a dissolved state; (c) removing from the resulting admixture the ammonia and salt; and (d) forming a cellulose fiber or film from the resulting cellulose solution.
Claim 16
Independent Claim
87 words
A method of forming cellulose fibers or films which comprises: (a) dissolving cellulose in an ammonia-solvent comprising ammonia and a salt selected from the group consisting of ammonium iodide, ammonium nitrate, ammonium perchlorate, ammonium thiocyanate, sodium iodide, sodium nitrate, sodium perchlorate, and sodium thiocyanate; (b) admixing with the resulting ammonia-solvent cellulose solution a solvent which is capable of maintaining cellulose in a dissolved state; (c) removing from the resulting admixture the ammonia and salt; and (d) forming a cellulose fiber or film from the resulting cellulose solution.
Claim 17
Dependent Claim
14 words
The method of claim 13, wherein said ammonia-solvent comprises about 20-50 wt. % ammonia.
Claim 18
Dependent Claim
18 words
The method of claim 13 or 14, wherein said ammonia-solvent comprises about 50-80 wt. % of said salt.
Claim 19
Dependent Claim
18 words
The method of claim 13, wherein said solvent is glycerol, dimethyl formamide, 2-pyrolidone, ethylene diamine, morpholine or pyridine.
Claim 20
Dependent Claim
23 words
The method of claim 13, wherein from 50 v/v % to 300 v/v % of solvent are admixed with said ammonia-solvent cellulose solution.
Claim 21
Dependent Claim
12 words
The method of claim 13, wherein cellulose fibers are prepared by dry-spinning.
Claim 22
Dependent Claim
21 words
The method of claim 13, wherein cellulose films are prepared by casting a film of the cellulose and evaporating said solvent.
Claim 23
Dependent Claim
15 words
The method of claim 13, wherein said solvent comprises up to 8 wt. % water.
Claim 24
Dependent Claim
12 words
The method of claim 13, wherein cellulose fibers are prepared by wet-spinning.
Claim 25
Dependent Claim
21 words
The method of claim 13, wherein cellulose films are prepared by casting a film of the cellulose onto a coagulation bath.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |