Claims
- 1. A high tensile strength, solvent-spun cellulose fiber having a dry tensile strength of from about 11 to about 17 g/den which is stable in alkaline solutions, produced by:
- a) forming an aqueous cellulose/zinc chloride (ZnCl.sub.2) mixture, said mixture having a final cellulose concentration in the range of from about 5% to about 45% by weight to volume (w/v), and a final ZnCl.sub.2 concentration in the range of from about 55% to about 80% weight to weight (w/w);
- b) stirring and heating said cellulose/ZnCl.sub.2 mixture at a temperature ranging from about 40.degree. C. to about 120.degree. C., thereby forming a cellulose/ZnCl.sub.2 solution;
- c) extruding said cellulose/ZnCl.sub.2 solution into a coagulation medium wherein the cellulose in said cellulose/ZnCl.sub.2 solution coagulates to form fiber, said fiber not being fully crystallized;
- said coagulation medium comprising one or more alcohols or ketones;
- d) removing said fiber from said coagulation medium and treating said fiber to remove residual solvent and coagulation medium therefrom;
- e) applying tension to said fiber sufficient to stretch said fiber and orient the molecules therein;
- f) submerging said fiber in a bath containing water to fully crystallize said fiber;
- g) removing said fiber from said bath for drying or further treatment.
- 2. The product of claim 1, wherein said cellulose and said ZnCl.sub.2 are food-quality.
- 3. A high tensile strength solvent-spun cellulose fiber or film having a dry tensile strength of from about 11 to about 17 g/den which is stable in alkaline solutions, produced by:
- a) forming an aqueous cellulose/zinc chloride (ZnCl.sub.2) mixture, said mixture having a final cellulose concentration in the range of from about 5% to about 45% weight to volume (w/v), and a final ZnCl.sub.2 concentration in the range of from about 55% to about 80% weight to weight (w/w);
- b) stirring and heating said cellulose/ZnCl.sub.2 mixture at a temperature ranging from about 40.degree. C. to about 120.degree. C., thereby forming a cellulose/ZnCl.sub.2 solution;
- c) extruding said cellulose/ZnCl.sub.2 solution into a coagulation medium wherein the cellulose in said cellulose/ZnCl.sub.2 solution coagulates to form fiber or a film;
- said coagulation medium comprising one or more alcohols or ketones;
- d) removing said fiber or said film from said coagulation medium and treating said fiber or said film to remove residual solvent and coagulation medium therefrom;
- e) applying tension to said fiber sufficient to stretch said fiber and orient the molecules therein;
- f) submerging said fiber in a bath containing water to fully crystallize said fiber;
- g) removing said fiber from said bath for drying or further treatment.
- 4. The product of claim 3, wherein said cellulose and said ZnCl.sub.2 are food quality.
- 5. A high tensile strength a solvent-spun cellulose fiber or film having a dry tensile strength of from about 11 to about 17 g/den which is stable in alkaline solutions, produced by:
- a) forming an aqueous cellulose/zinc chloride (ZnCl.sub.2) mixture, said mixture having a final cellulose concentration in the range of from about 5% to about 45% weight to volume (w/v), and a final ZnCl.sub.2 concentration in the range of from about 55% to about 80% weight to weight (w/w);
- b) stirring and heating said cellulose/ZnCl.sub.2 mixture at a temperature ranging from about 40.degree. C. to about 120.degree. C., thereby forming a cellulose/ZnCl.sub.2 solution;
- c) extruding said cellulose/ZnCl.sub.2 solution into water wherein the cellulose in said cellulose/ZnCl.sub.2 solution coagulates to form fiber or a film;
- d) removing said fiber or said film from said coagulation medium and treating said fiber or said film to remove residual solvent therefrom.
- 6. The product of claim 5, wherein said cellulose and said ZnCl.sup.2 are food-quality.
- 7. The product of claim 2, wherein said cellulose is dissolving grade and has a DP of from about 100 to about 3,000.
- 8. The product of claim 4, wherein said cellulose is dissolving grade and has a DP of from about 100 to about 3,000.
- 9. The product of claim 6, wherein said cellulose is dissolving grade and has a DP of from about 100 to about 3,000.
Parent Case Info
This is a continuation-in-part (CIP) of application Ser. No. 07/496,585, filed on Mar. 21, 1990, now abandoned, which is a division of application Ser. No. 07/261,000, filed Oct. 21, 1988, now U.S. Pat. No. 4,999,149.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
625033 |
Hoyne |
May 1899 |
|
4388256 |
Ishida et al. |
Jun 1983 |
|
4742164 |
Iguchi et al. |
May 1988 |
|
Non-Patent Literature Citations (1)
Entry |
Chegolya et al, "Production of Regenerated Cellulose Fibers Without Carbon Disulfide", Textile Research Journal (Sep. 1989). |
Divisions (1)
|
Number |
Date |
Country |
Parent |
261000 |
Oct 1988 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
496585 |
Mar 1990 |
|