Patent US4276348A successfully refreshed from Google Patents.
US4276348A
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High tenacity polyethylene fibers and process for producing same
Assignee: Solutia Inc
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Filing: 1980-01-07
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Granted: 1981-06-30
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Expires: 2000-01-07
Abstract
Abstract Polyethylene yarns having tenacities of at least 12 grams per denier are produced at commercially feasible spinning speeds by a process in which a high density polyethylene having a Mn of at least 20,000 and a Mw of less than 125,000 is extruded through a high temperature spinneret (220 DEG -335 DEG C.) to form yarns which are hot-drawn at a temperature between about 115 DEG and 132 DEG C. The yarns produced by this process are particularly useful as industrial cordage.
Inventors
- 👤 Wen-li Wu
- 👤 William B. Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:20
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
Fibers consisting of a polyethylene having a M n of at least 20,000, a M w of less than 125,000, a density of between 0.92 and 1.00 grams per cubic centimeter, said fibers having a tenacity of at least 12 grams per denier and a modulus of at least 272 grams per denier when measured at 72% relative humidity and 25° C. on a bundle of at least 8 filaments using a gauge length of at least 25 centimeters.
Claim 2
Dependent Claim
79 words
Fibers consisting of a polyethylene having a M n of at least 20,000, a M w of less than 125,000, a density of between 0.92 and 1.00 grams per cubic centimeter, said fibers having a tenacity of at least 12 grams per denier and a modulus of at least 272 grams per denier when measured at 72% relative humidity and 25° C. on a bundle of at least 8 filaments using a gauge length of at least 25 centimeters.
Claim 3
Dependent Claim
13 words
The fibers of claim 1 wherein said M n is at least 22,000.
Claim 4
Dependent Claim
16 words
The fibers of claim 1 wherein said density is at least 0.96 grams per cubic centimeter.
Claim 5
Dependent Claim
15 words
The fibers of claim 1 wherein said tenacity is at least 15 grams per denier.
Claim 6
Dependent Claim
11 words
The fibers of claim 1 in the form of a monofilament.
Claim 7
Dependent Claim
17 words
The fibers of claim 1 in the form of a yarn consisting of a bundle of filaments.
References Cited (Backward Citations)
US2210774A
Cited
US3396073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |