US4430383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filaments of high tensile strength and modulus
Assignee: DSM BV
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Filing: 1982-09-30
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Granted: 1984-02-07
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Expires: 2002-09-30
Abstract
Abstract The invention relates to the preparation of filaments with a high tensile strength and a high modulus and to the filaments thus prepared. A solution of a linear polyethylene with a weight-average molecular weight of at least 4×10 5 is spun and the filaments, from which the solvent may have been removed in whole or in part, are drawn using a draw ratio of at least (12×10 6 /M w )+1. The filaments are drawn at a temperature such that the modulus is at least 20 GPa. The invention allows filaments to be prepared at high drawing rates, of 0.5 sec -1 or more, with a modulus of at least 20 GPa and a tensile strength of at least 1 GPa.
Inventors
- 👤 Paul Smith
- 👤 Pieter J. Lemstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:24
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; D01D; D01D10/00; D01D10/02; D01D5/00; D01D5/12; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2223/00; B29K2223/04; B29K2223/06; B29K2995/00; B29K2995/0037; B29K2995/0088; D07; D07B; D07B1/00; D07B1/02; D07B1/025; D07B2205/00; D07B2205/20; D07B2205/201; D07B2205/2014; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
A solution-spun and drawn high molecular weight M w polyethylene filament of combined high modulus and high tensile strength wherein said molecular weight M w is at least 8×10 5 , said modulus is at least 20 GPa, said tensile strength is at least 2 GPa.
Claim 2
Dependent Claim
46 words
A solution-spun and drawn high molecular weight M w polyethylene filament of combined high modulus and high tensile strength wherein said molecular weight M w is at least 8×10 5 , said modulus is at least 20 GPa, said tensile strength is at least 2 GPa.
Claim 3
Dependent Claim
65 words
A solution-spun and drawn high molecular weight M w polyethylene filament of combined high modulus and high tensile strength wherein said molecular weight M w is at least 8×10 5 , said modulus is at least 20 GPa, said tensile strength is at least 2 GPa, and wherein said filament has been drawn at a draw ratio of at least (12×10 6 /M w )+1.
Claim 4
Dependent Claim
65 words
A solution-spun and drawn high molecular weight M w polyethylene filament of combined high modulus and high tensile strength wherein said molecular weight M w is at least 8×10 5 , said modulus is at least 20 GPa, said tensile strength is at least 2 GPa, and wherein said filament has been drawn at a draw ratio of at least (12×10 6 /M w )+1.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |