US3880976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of elastic yarn
Assignee: Toyobo Co Ltd
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Filing: 1973-05-30
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Granted: 1975-04-29
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Expires: 1993-05-30
Abstract
Abstract The present invention relates to a process for preparing elastic filament for yarn with improved breaking strength and elastic recovery. The process comprises preparing a composition by adding 0.1 to 1 part of a fatty acid amine, fatty acid methylol amide or higher fatty acid ester to 100 parts of a polytetramethylene glycol-polyethylene terephthalate block copolymer of an inherent viscosity of more than 2.0 obtained from polytetramethylene glycol and polyethylene terephthalate, melt-spinning the composition to form filaments and stretching, then shrinking the formed filaments while heating them.
Inventors
- 👤 Misao Sumoto
- 👤 Hideki Komagata
- 👤 Hiroshi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:25
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11; C08K5/16; C08K5/20; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L25/16; C08L67/00; C08L67/02; C08L67/025; D01F6/00; D01F6/78; D01F6/86; D01F6/88; D01F6/92; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A PROCESS FOR PRODUCING ELASTIC FILAMENTS WHEREIN: A COMPOSITION PREPARED BY ADDING A. 5 TO 15 PARTS OF OLIGOMER OF STYRENE, A-METHYL STYRENE OR VINYL TOLUENE OR A COPOLYMERIZED OLIGOMER THEREOF OF MOLECULAR WEIGHT OF 300 TO 1,000 AND B. 0.1 TO 1 PART OF A FATTY ACID AMIDE, FATTY ACID METHYOL AMIDE OR HIGHER FATTY ACID ESTER TO C. 100 PARTS OF A POLYTETRAMETHYLENE GLYCOPOLYETHYLENE TEREPHTHALATE BLOCK COPOLYMER OF AN INHERENT VISCOSITY OF MORE THAN 2.0 OBTAINED FROM POLYTETRAMETHYLENE GLYCOL HAVING A MOLECULAR WEIGHT OF 1800 TO 200 AND POLYETHYLENE TEREPHTHALATE THE CONTENT OF WHICH IN THE COPOLYMER IS 75-82 PERCENT BY WEIGHT, IS MELT-SPUN TO FORM FILAMENTS, WHICH AFTER BEING COOLED AND SOLIDIFIED, ARE STRETCHED AT A DRAW RATIO OF 4.5 TO 8 AT A TEMPERATURE OF 10*-30*C. AND THEN THE FILAMENTS ARE SHRUNK AT A FILAMENT TEMPERATURE OF 100*-150*C. SO THAT THE NDR (NET RATIO) IS 1.3-1.8.
Claim 2
Dependent Claim
150 words
A PROCESS FOR PRODUCING ELASTIC FILAMENTS WHEREIN: A COMPOSITION PREPARED BY ADDING A. 5 TO 15 PARTS OF OLIGOMER OF STYRENE, A-METHYL STYRENE OR VINYL TOLUENE OR A COPOLYMERIZED OLIGOMER THEREOF OF MOLECULAR WEIGHT OF 300 TO 1,000 AND B. 0.1 TO 1 PART OF A FATTY ACID AMIDE, FATTY ACID METHYOL AMIDE OR HIGHER FATTY ACID ESTER TO C. 100 PARTS OF A POLYTETRAMETHYLENE GLYCOPOLYETHYLENE TEREPHTHALATE BLOCK COPOLYMER OF AN INHERENT VISCOSITY OF MORE THAN 2.0 OBTAINED FROM POLYTETRAMETHYLENE GLYCOL HAVING A MOLECULAR WEIGHT OF 1800 TO 200 AND POLYETHYLENE TEREPHTHALATE THE CONTENT OF WHICH IN THE COPOLYMER IS 75-82 PERCENT BY WEIGHT, IS MELT-SPUN TO FORM FILAMENTS, WHICH AFTER BEING COOLED AND SOLIDIFIED, ARE STRETCHED AT A DRAW RATIO OF 4.5 TO 8 AT A TEMPERATURE OF 10*-30*C. AND THEN THE FILAMENTS ARE SHRUNK AT A FILAMENT TEMPERATURE OF 100*-150*C. SO THAT THE NDR (NET RATIO) IS 1.3-1.8.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |