US5256358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making stretched filaments of ultra-high-molecular weight polyethylene
Assignee: Mitsui Chemicals Inc
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Filing: 1992-07-09
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Granted: 1993-10-26
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Expires: 2012-07-09
Abstract
Abstract An extruded stretched filament of ultra-high-molecular-weight polyethylene has an intrinsic viscosity [ eta ] of at least 3.5 dl/g, a tensile strength at break of 10 kg/mm2, a draw ratio of at least 3, a C axis orientation degree of at least 0.9, an outer diameter of 0.1 to 10 mm phi , and a substantially indefinite length, and a method and apparatus for producing the same.
Inventors
- 👤 Takeshi Shiraki
- 👤 Yoshihiro Yoshimura
- 👤 Koji Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:03
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/06; B; B29; B29C; B29C48/00; B29C48/022; B29C55/00; B29C55/005; B29C55/30; D01D5/00; D01D5/08; D01F; D01F6/00; D01F6/02; D01F6/04; B29C48/03; B29C48/06; B29C48/07; B29K; B29K2023/00; B29K2023/04; B29K2023/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A method for producing an extruded stretched filament of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g and a tensile strength at break of at least 35 kg/mm 2 consisting of the steps of: melting ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g in a screw extruder; extruding the molten ultra-high-molecular-weight polyethylene from a die having an L/D of at least 10 to form an extruded strand; and taking-off the extruded strand at a draft ratio of at least 1 while gradually cooling the extruded strand; and stretching the strand at a draw ratio of at least 6 to form an extruded stretched filament.
Claim 2
Independent Claim
112 words
A method for producing an extruded stretched filament of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g and a tensile strength at break of at least 35 kg/mm 2 consisting of the steps of: melting ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g in a screw extruder; extruding the molten ultra-high-molecular-weight polyethylene from a die having an L/D of at least 10 to form an extruded strand; and taking-off the extruded strand at a draft ratio of at least 1 while gradually cooling the extruded strand; and stretching the strand at a draw ratio of at least 6 to form an extruded stretched filament.
Claim 3
Independent Claim
124 words
A method of producing a whitened wire of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 6 dl/g, a tensile strength at break of at least 35 kg/mm 2 , and a folding return angle θ of 10° or less when folded at 90° and 180°, consisting of the steps of: melting ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g in a screw extruder; extruding the molten ultra-high-molecular-weight polyethylene from a die having an L/D of at least 10 to form an extruded strand; taking-off the extruded strand at a draft ratio of at least 1 while cooling the extruded strand; and stretching the strand at a draw ratio of 8 to 30 to form a whitened wire.
Claim 4
Independent Claim
124 words
A method of producing a whitened wire of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 6 dl/g, a tensile strength at break of at least 35 kg/mm 2 , and a folding return angle θ of 10° or less when folded at 90° and 180°, consisting of the steps of: melting ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g in a screw extruder; extruding the molten ultra-high-molecular-weight polyethylene from a die having an L/D of at least 10 to form an extruded strand; taking-off the extruded strand at a draft ratio of at least 1 while cooling the extruded strand; and stretching the strand at a draw ratio of 8 to 30 to form a whitened wire.
Claim 5
Dependent Claim
52 words
A method as claimed in claim 2, wherein the strand is stretched at a draw ratio of 4 to 8 at a first stage and is stretched at a draw ratio of 2 to 5 at a second stage to form the wire at a total draw ratio of 8 to 30.
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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) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |