US3900549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of spinning composite filaments
Assignee: Kuraray Co Ltd
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Filing: 1973-06-01
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Granted: 1975-08-19
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Expires: 1993-06-01
Abstract
Abstract A method for preparing composite filaments composed of a polyethylene and a polyester, which comprises mixing a polyethylene having a melt index of above 27 with a polyester having a specific inherent viscosity, the proportion of the polyethylene being 5 to 15% or 25 to 90% based on the total weight of the mixture, melt extruding the resulting mixture through a spinneret, and then withdrawing the extruded filaments at a speed of above 2,500 meters per minute.
Inventors
- 👤 Tadayuki Yamane
- 👤 Yutaka Hirano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:13
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; C; C08; C08L; C08L67/00; D01F1/00; D01F1/02; D01F1/10; D01F8/00; D01F8/04; D01F8/14; C08L23/00; C08L23/02; C08L23/04; C08L23/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A METHOD OF SPINNING COMPOSIT FILAMENTS COMPOSED OF A POLYETHYLENE AND A POLYESTER WHICH COMPRISS MIXING A POLYETHYLENE HAVING A METAL INDEX OF ABOUT 27 BUT BELOW 200 WITH A FIBER-FORMING POLYESTER HAVING AN INTRINSIC VISCOSITY OF 0.5 TO 0.9 SO THAT THE FOLLOWING CONDITION IS SATISFIED: THE WEIGHT % THE POLYETHYLENE TO THE TOTAL WEIGHT OF THE MIXTURE IS IN THE RANGE OF 25 TO 90 % AND MOREOVER THE RELATIONSHIP
Claim 2
Independent Claim
72 words
A METHOD OF SPINNING COMPOSIT FILAMENTS COMPOSED OF A POLYETHYLENE AND A POLYESTER WHICH COMPRISS MIXING A POLYETHYLENE HAVING A METAL INDEX OF ABOUT 27 BUT BELOW 200 WITH A FIBER-FORMING POLYESTER HAVING AN INTRINSIC VISCOSITY OF 0.5 TO 0.9 SO THAT THE FOLLOWING CONDITION IS SATISFIED: THE WEIGHT % THE POLYETHYLENE TO THE TOTAL WEIGHT OF THE MIXTURE IS IN THE RANGE OF 25 TO 90 % AND MOREOVER THE RELATIONSHIP
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the melt index is 30 - 150.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the intrinsic viscosity of the polyester is 0.55 - 0.80.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the value of x is in the range of 35 - 70 % by weight.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein said polyester is polyethylene terephthalate.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the melt extrusion of said mixture is carried out by the blend spinning method.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein the melt extrusion of said mixture is carried out by the conjugated spinning method.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |