Patent EP0190878A2 successfully refreshed from Google Patents.
EP0190878A2
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EP
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Extruded stretched filament of ultra-high-molecular-weight polyethylene and production method and apparatus 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 Disclosed are an extruded stretched filament of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [ eta ] of at least 3.5 dl/g, a tensile strength at break of 10 kg/mm<2>, 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 mmo, 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
EP
Data Source
google_patents
Last Synchronized
2026-11-01 02:18
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: 14
Claim 1
Independent Claim
54 words
An extruded stretched filament of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [n] of at least 3.5 dl/g, a tensile strength 2 at break of at least 10 kg/mm , a draw ratio of at least 3, a C axis orientation degree of at least 0.9, and an outer diameter of 0.1 to 10 mmφ.
Claim 2
Dependent Claim
54 words
An extruded stretched filament of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [n] of at least 3.5 dl/g, a tensile strength 2 at break of at least 10 kg/mm , a draw ratio of at least 3, a C axis orientation degree of at least 0.9, and an outer diameter of 0.1 to 10 mmφ.
Claim 3
Dependent Claim
54 words
An extruded stretched filament as claimed in claim 1, wherein the intrinsic viscosity is 6 to 26 dl/g, the tensile strength at break is 40 kg/mm 2 or more, the draw ratio is 6 or more, the C axis orientation degree is 0.95 or more, and the outer diameter is 0.2 to 3 mmφ.
Claim 4
Independent Claim
59 words
A method for producing an extruded filament of ultra-high-molecular-weight polyethylene 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; and taking-off the extrudate at a draft ratio of at least 1 while it is gradually cooled, and optionally stretching the extrudate.
Claim 5
Independent Claim
59 words
A method for producing an extruded filament of ultra-high-molecular-weight polyethylene 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; and taking-off the extrudate at a draft ratio of at least 1 while it is gradually cooled, and optionally stretching the extrudate.
Claim 6
Independent Claim
113 words
An apparatus for producing an extruded filament of ultra-high-molecular-weight polyethylene comprising, in sequence from an extruder side: an extruder provided with a grooved cylinder and a screw having a compression ratio of 1 to 2.5; a die connected to the screw tip, said die having an L/D of at least 10 and a ratio S 1 /S 2 of a cross-sectional area S 1 of the inlet portion of the die to a cross-sectional area S 2 of the outlet portion of the die of 1.0 to 5.0; a gradual-cooling cylinder provided with an air ring or a sizing die at the inlet portion thereof for the extruded strand; and a taking-off unit.
Claim 7
Independent Claim
113 words
An apparatus for producing an extruded filament of ultra-high-molecular-weight polyethylene comprising, in sequence from an extruder side: an extruder provided with a grooved cylinder and a screw having a compression ratio of 1 to 2.5; a die connected to the screw tip, said die having an L/D of at least 10 and a ratio S 1 /S 2 of a cross-sectional area S 1 of the inlet portion of the die to a cross-sectional area S 2 of the outlet portion of the die of 1.0 to 5.0; a gradual-cooling cylinder provided with an air ring or a sizing die at the inlet portion thereof for the extruded strand; and a taking-off unit.
Claim 8
Dependent Claim
42 words
A whitened wire of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [n] of at least 4 dl/g, a tensile strength at break of at least 20 kg/mm2, and a folding return angle 6 of 20° or less when folded at 90° and 180°.
Claim 9
Dependent Claim
42 words
A whitened wire of ultra-high-molecular-weight polyethylene having an intrinsic viscosity [n] of at least 4 dl/g, a tensile strength at break of at least 20 kg/mm2, and a folding return angle 6 of 20° or less when folded at 90° and 180°.
Claim 10
Dependent Claim
45 words
A whitened wire as claimed in claim 5, wherein the intrinsic viscosity [n] is 8 to 30 dl/g, the tensile strength at break is 50 kg/mm 2 or more, and the folding return angle 9 when folded at 90° and 180° is 10° or less.
Claim 11
Dependent Claim
66 words
A method for producing the whitened wire of claim 5 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 strands; and stretching the strands, e.g.at a draw ratio of 8 to 30.
Claim 12
Dependent Claim
52 words
A method as claimed in claim 7, 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.
Claim 13
Dependent Claim
16 words
A raw filament extrudate stretchable to a filament according to claim 1, 2, 5 or 6.
Claim 14
Dependent Claim
18 words
A stretchable filament obtainable by a method according to claim 3 or from apparatus according to claim 4.
References Cited (Backward Citations)
No citation records indexed.
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