US4411854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of filaments with high tensile strength and modulus
Assignee: DSM BV
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Filing: 1981-12-15
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Granted: 1983-10-25
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Expires: 2001-12-15
Abstract
Abstract Process for the production of filaments of polyethylene with high modulus and tensile strength, comprising spinning a filler containing solution of a linear polyethylene with a weight-average molecular weight (M w ) of at least 400,000 to form filled filaments and then stretching the filaments.
Inventors
- 👤 Franciscus H. J. Maurer
- 👤 Jacques P. L. Pijpers
- 👤 Paul Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:37
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01D; D01D5/00; D01D5/12; D01F6/00; D01F6/02; D01F6/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
Process for the production of filaments with a high modulus and high tensile strength comprising the steps of, (a) preparing a filler containing solution of a linear polyethylene with a weight-average molecular weight of at least about 400,000, (b) spinning said filler containing solution of step (a) to form a filament by cooling without substantial evaporation of solvent to form a gel, and (c) stretching said filament at a stretching ratio of at least about 12×10 6 /M w +1.
Claim 2
Dependent Claim
80 words
Process for the production of filaments with a high modulus and high tensile strength comprising the steps of, (a) preparing a filler containing solution of a linear polyethylene with a weight-average molecular weight of at least about 400,000, (b) spinning said filler containing solution of step (a) to form a filament by cooling without substantial evaporation of solvent to form a gel, and (c) stretching said filament at a stretching ratio of at least about 12×10 6 /M w +1.
Claim 3
Dependent Claim
25 words
Process in accordance with claim 1, wherein said admixture contains about 5% to about 60% by volume of filler calculated in respect of said polyethylene.
Claim 4
Dependent Claim
28 words
Process in accordance with claim 1 including the intermediate step of removing at least about 50% by weight of solvent from said filament of step (b) before stretching.
Claim 5
Dependent Claim
24 words
Process in accordance with claim 3 wherein sufficient solvent is removed so that said filament contains about 25% by weight of solvent while stretched.
Claim 6
Dependent Claim
19 words
Process in accordance with claim 1, wherein said solution contains about 1% to about 50% by weight of polyethylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |