Patent EP0401942A2 successfully refreshed from Google Patents.
EP0401942A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Whitened wire of ultra-high-molecular-weight polyethylene and production thereof
Assignee: Mitsui Chemicals Inc
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Filing: 1986-01-29
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Granted: —
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Expires: 2006-01-29
Abstract
Abstract A whitened wire (21) of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g, a tensile strength at break of at least 20 kg/mm², and a folding return angle ϑ of 20° or less when folded at 90° and 180°. The whitened wire is produced by melting the ultra-high-molecular-weight polyethylene in a screw extruder; extruding the molten ultra-high-molecular-weight polyethylene from a die having an L/D of at least 10; taking-off the extrudate at a draft ratio of at least 1 while gradually cooling the extruded strand; and stretching the taken-off strand in one or more stages.
Inventors
- 👤 Takeshi Shiraki
- 👤 Yoshihiro Yoshimura
- 👤 Koji Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:43
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/30; B29C48/00; B29C48/022; B29C55/005; D; D01; D01D; D01D1/00; D01D1/06; D01D5/00; D01D5/08; D01F; D01F6/00; D01F6/02; D01F6/04; B29C48/03; B29C48/05; B29K; B29K2023/00; B29K2023/04; B29K2023/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A whitened wire of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g, a tensile strength at break of at least 20 kg/mm², and a folding return angle ϑ of 20° or less when folded at 90° and 180°.
Claim 2
Dependent Claim
42 words
A whitened wire of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [η] of at least 4 dl/g, a tensile strength at break of at least 20 kg/mm², and a folding return angle ϑ of 20° or less when folded at 90° and 180°.
Claim 3
Dependent Claim
43 words
A whitened wire according to claim 1, wherein the intrinsic viscosity [η] is 8 to 30 dl/g, the tensile strength at break is 50 kg/mm² or more, and the folding return angle ϑ when folded at 90° and 180° is 10° or less.
Claim 4
Dependent Claim
65 words
A method for producing a whitened wire according to claim 1 comprising the steps of: melting the ultra-high-molecular-weight polyethylene in a screw extruder; extruding the molten ultra-high-molecular-weight polyethylene from a die having an L/D of at least 10; taking-off the extrudate at a draft ratio of at least 1 while gradually cooling the extruded strand; and stretching the taken-off strand in one or more stages.
Claim 5
Dependent Claim
21 words
A method according to claim 3 wherein the taken-off strand is stretched at a stretch ratio of from 8 to 30.
Claim 6
Dependent Claim
50 words
A method according to claim 4 wherein the taken-off strand is first stretched at a stretch ratio of from 4 to 8 and then stretched again at a stretch ratio of from 2 to 5 to form the whitened wire at a total stretch ratio of from 8 to 30.
References Cited (Backward Citations)
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