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US4121012A
Expired / Lapsed
US
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Crimped, high-strength rayon yarn and method for its preparation
Assignee: Akzo Nobel UK PLC
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Filing: 1976-02-06
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Granted: 1978-10-17
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Expires: 1996-02-06
Abstract
Abstract A crimped, high-strength regenerated cellulose yarn of filaments having a broken skin-core cross-sectional structure of which the skin comprises at least about 20 up to about 40% of the cross-sectional area, the peripheral skin surface is substantially smooth and the core section is "blown-out;" and a method of preparing the yarn from a specified viscose and spinning bath wherein the formed yarn is highly stretched and then crimped in the relaxed state in a plasticizing medium.
Inventors
- 👤 Gregory C. Bockno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:31
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01D; D01D5/00; D01D5/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2929; Y10T428/2931; Y10T428/2933; Y10T428/2935; Y10T428/2973
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
207 words
A method for preparing crimped high-strength rayon which consists essentially of extruding a multiplicity of filaments of viscose prepared with from about 6 to about 9 percent cellulose, from about 6 to about 9 percent caustic soda, and from about 28 to about 39 percent carbon disulfide, based on the weight of the cellulose, said viscose containing from about 1 to about 8 percent based on the weight of the cellulose of a regeneration retardant, and having a spinning ball-fall viscosity of from about 40 to about 150 and a common salt index of from about 6 to about 11, into a spinning bath containing from about 4 to about 7 percent sulfuric acid, from about 2 to about 5 percent zinc sulfate and from about 15 to about 24 percent sodium sulfate, said spinning bath being maintained at a temperature ranging from about 30° to about 55° C., withdrawing coagulated and incompletely regenerated filaments from said spinning bath and passing said filaments through an aqueous stretch bath maintained at a temperature ranging from about 75 to about 100° C., stretching said filaments in said stretch bath from about 90 to about 140 percent and then sluicing the filaments in a relaxed state in a plasticizing medium.
Claim 2
Independent Claim
207 words
A method for preparing crimped high-strength rayon which consists essentially of extruding a multiplicity of filaments of viscose prepared with from about 6 to about 9 percent cellulose, from about 6 to about 9 percent caustic soda, and from about 28 to about 39 percent carbon disulfide, based on the weight of the cellulose, said viscose containing from about 1 to about 8 percent based on the weight of the cellulose of a regeneration retardant, and having a spinning ball-fall viscosity of from about 40 to about 150 and a common salt index of from about 6 to about 11, into a spinning bath containing from about 4 to about 7 percent sulfuric acid, from about 2 to about 5 percent zinc sulfate and from about 15 to about 24 percent sodium sulfate, said spinning bath being maintained at a temperature ranging from about 30° to about 55° C., withdrawing coagulated and incompletely regenerated filaments from said spinning bath and passing said filaments through an aqueous stretch bath maintained at a temperature ranging from about 75 to about 100° C., stretching said filaments in said stretch bath from about 90 to about 140 percent and then sluicing the filaments in a relaxed state in a plasticizing medium.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the crimped high-strength rayon filaments produced range in denier from about 1.5 to about 8.
Claim 4
Dependent Claim
35 words
The method of claim 2 wherein the stretched filaments are cut into staple fibers and the staple fibers sluiced in an aqueous bath maintained at a temperature of from about 75° to about 100° C.
Claim 5
Dependent Claim
74 words
The method of claim 1 wherein the viscose is prepared with about 7.5 percent cellulose, about 7.5 percent caustic soda and about 34 percent carbon disulfide, said viscose containing as a regeneration retardant, about 1.75 percent dimethylamine and about 3.5 percent of a polyoxyethylene glycol ether of phenol, said viscose having a spinning ball-fall viscosity of from about 70 to about 80 and a common salt index of from about 7.5 to about 9.5.
Claim 6
Dependent Claim
49 words
The method of claim 11 wherein the spinning bath contains about 5 to about 6.5 percent sulfuric acid, about 3 percent zinc sulfate, about 17 to about 20 percent sodium sulfate and is maintained at about 48° C., and said aqueous stretch bath contains about 2.5 percent sulfuric acid.
Claim 7
Dependent Claim
43 words
The method of claim 1 wherein the crimped high-strength rayon filaments produced range in denier from about 1.5 to about 8 and the stretched filaments are cut into staple fibers and sluiced in a water bath maintained at about 75° to 100° C.
Claim 8
Dependent Claim
8 words
The products of the method of claim 1.
Claim 9
Dependent Claim
125 words
A crimped yarn comprising regenerated cellulose filaments having a broken skin-core-sectional structure of which the skin comprises at least about 20 percent up to about 40 percent of the cross-sectional area, the skin of said filaments being positioned at the inside of the bends and the core being positioned at the outside of the bends of the crimp, the peripheral skin surface of said cross-sectional structure being substantially smooth and the core section protruding from said structure, said yarn having a wet tenacity of at least about 2.25 grams per denier, a conditioned tenacity of at least about 3.5 grams per denier, and a wet extensibility ranging from about 15 to about 22 percent, said filaments having been formed by the method of claim 9.
Claim 10
Dependent Claim
19 words
The crimped yarn of claim 1 wherein the individual filament denier ranges from about 1.5 up to about 8.
Claim 11
Dependent Claim
12 words
The crimped yarn of claim 1 in the form of staple fibers.
Claim 12
Dependent Claim
23 words
The crimped yarn of claim 1 wherein the individual filaments have cross-sectional structure in which the skin portion is of substantially uniform thickness.
Claim 13
Dependent Claim
16 words
The crimped yarn of claim 1 having an initial wet modulus of about 10 to 12.
Claim 14
Dependent Claim
14 words
The crimped yarn of claim 1 having between 10 and 30 crimps per inch.
Claim 15
Dependent Claim
15 words
The crimped yarn of claim 1 having a conditioned elongation of 14 to 22 percent.
Claim 16
Dependent Claim
8 words
A fabric comprising the yarn of claim 1.
References Cited (Backward Citations)
US2937922A
Cited
US2942931A
Cited
US3277226A
Cited
US3434913A
Cited
US3494996A
Cited
US3296000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |