Patent US4422993A successfully refreshed from Google Patents.
US4422993A
Expired / Lapsed
US
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Process for the preparation of filaments of high tensile strength and modulus
Assignee: DSM BV
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Filing: 1980-06-24
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Granted: 1983-12-27
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Expires: 2000-06-24
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
2026-10-25 23:30
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: 9
Claim 1
Independent Claim
96 words
Process for the preparation of polyethylene filaments of high modulus and tensile strength which comprises spinning a solution having a concentration of from 1% to 20% by weight of a high-molecular-weight linear polyethylene polymer with a weight-average molecular weight of M w of at least 8×10 5 , and thereafter drawing the spun filaments using a draw ratio of at least (12×10 6 /M w )+1, at a drawing temperature of between 75° to 135° C. such that, at the draw ratio, concentration and temperature used, the modulus of the filaments is at least 20 GPa.
Claim 2
Dependent Claim
96 words
Process for the preparation of polyethylene filaments of high modulus and tensile strength which comprises spinning a solution having a concentration of from 1% to 20% by weight of a high-molecular-weight linear polyethylene polymer with a weight-average molecular weight of M w of at least 8×10 5 , and thereafter drawing the spun filaments using a draw ratio of at least (12×10 6 /M w )+1, at a drawing temperature of between 75° to 135° C. such that, at the draw ratio, concentration and temperature used, the modulus of the filaments is at least 20 GPa.
Claim 3
Dependent Claim
185 words
A process for the preparation of polyethylene filaments of high modulus and tensile strength which consists essentially in spinning a solution having a concentration of from 1% to 20% of high molecular weight linear polyethylene polymer, said polymer having a weight-average molecular weight M w of at least about 8×10 5 , using a hydrocarbon or halogenated hydrocarbon solvent having a boiling range at atmospheric temperature of from about 100° C. to about 250° C., the temperature of said solution during spinning being from about 100° C. to about 240° C., spinning said filament through a spinning aperture having a major cross-sectional dimension of from about 0.2 mm to about 2 mm, and thereafter drawing the spun filaments at a temperature between about 75° C. up to about 135° C., at a drawing speed from about 0.5 sec -1 to 1 sec -1 , and using a draw ratio of at least (12×10 6 /M w )+1, the drawing temperature and drawing ratio used being selected together so that the modulus of the filaments is at least about 20 GPa and up to 100 GPa.
Claim 4
Dependent Claim
185 words
A process for the preparation of polyethylene filaments of high modulus and tensile strength which consists essentially in spinning a solution having a concentration of from 1% to 20% of high molecular weight linear polyethylene polymer, said polymer having a weight-average molecular weight M w of at least about 8×10 5 , using a hydrocarbon or halogenated hydrocarbon solvent having a boiling range at atmospheric temperature of from about 100° C. to about 250° C., the temperature of said solution during spinning being from about 100° C. to about 240° C., spinning said filament through a spinning aperture having a major cross-sectional dimension of from about 0.2 mm to about 2 mm, and thereafter drawing the spun filaments at a temperature between about 75° C. up to about 135° C., at a drawing speed from about 0.5 sec -1 to 1 sec -1 , and using a draw ratio of at least (12×10 6 /M w )+1, the drawing temperature and drawing ratio used being selected together so that the modulus of the filaments is at least about 20 GPa and up to 100 GPa.
Claim 5
Dependent Claim
95 words
Process for the preparation of polyethylene filaments of high modulus and tensile strength which comprises spinning a solution having a concentration of from 1% to 10% by weight of high-molecular-weight linear polyethylene polymer with a weight-average molecular weight of M w of at least 8×10 5 , and thereafter drawing the spun filaments using a draw ratio of at least (12×10 6 /M w )+1, at a drawing temperature of between 75° to 135° C. such that, at the draw ratio, concentration and temperature used, the modulus of the filaments is at least 30 GPa.
Claim 6
Dependent Claim
95 words
Process for the preparation of polyethylene filaments of high modulus and tensile strength which comprises spinning a solution having a concentration of from 1% to 10% by weight of high-molecular-weight linear polyethylene polymer with a weight-average molecular weight of M w of at least 8×10 5 , and thereafter drawing the spun filaments using a draw ratio of at least (12×10 6 /M w )+1, at a drawing temperature of between 75° to 135° C. such that, at the draw ratio, concentration and temperature used, the modulus of the filaments is at least 30 GPa.
Claim 7
Dependent Claim
24 words
The process according to any one of claims 1, 2 or 3, wherein the draw ratio is at least (14×10 6 /M w )+1.
Claim 8
Dependent Claim
24 words
The process according to any one of claims 1, 2 or 3, wherein the draw ratio is at least (18×10 6 /M w )+1.
Claim 9
Dependent Claim
23 words
The process according to any one of claims 1, 2 or 3, wherein the drawing rate is at least 0.5 sec -1 .
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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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |