EP0352749A2
Expired / Lapsed
EP
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A filament comprising a tetrafluoroethylene polymer and a process for producing the same
Assignee: Asahi Kasei Corp
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Filing: 1989-07-25
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Granted: —
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Expires: 2009-07-25
Abstract
Abstract A yarn article comprising a tetrafluoroethylene polymer is disclosed which has a specific bulk density, a specific orientation degree in an axial direction and a specific crystallinity and exhibits specific peaks in the thermogram of differential scanning calorimetry. The yarn article has excellent tensile strength at break and excellent tensile modulus of elasticity as well as inertness to chemicals. Therefore, the yarn article of the present invention can advantageously be used as a material for producing a woven fabric, a knit, a rope and the like, particularly in the field where not only chemical resistance but also high tensile strength and high tensile modulus of elasticity are required.
Inventors
- 👤 Shigeki Katayama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:07
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/12; Y; Y10; Y10S; Y10S57/00; Y10S57/907; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/298; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A yarn article comprising a tetrafluoroethylene polymer, which has a bulk density of 2.15 to 2.30, an orientation degree in an axial direction of 0.9 or more and a crystallinity of 85 % or more and exhibits peaks at 345 ± 5 °C and 380 ± 5 °C in the thermogram of differential scanning calorimetry in the course of temperature elevation at a rate of 10 °C/min.
Claim 2
Dependent Claim
67 words
A yarn article comprising a tetrafluoroethylene polymer, which has a bulk density of 2.15 to 2.30, an orientation degree in an axial direction of 0.9 or more and a crystallinity of 85 % or more and exhibits peaks at 345 ± 5 °C and 380 ± 5 °C in the thermogram of differential scanning calorimetry in the course of temperature elevation at a rate of 10 °C/min.
Claim 3
Dependent Claim
18 words
The yarn article according to claim 1, having a tensile modulus of elasticity of 200 g/d or more.
Claim 4
Dependent Claim
23 words
The yarn article according to any of claims 1 or 2, which is a monofilament having a fineness of 100 denier or less.
Claim 5
Dependent Claim
124 words
A process for producing a yarn article comprising a tetrafluoroethylene polymer, which comprises drawing a tetrafluoroethylene polymer filament at a temperature of not lower than the melting point of said tetrafluoroethylene polymer filament, said tetrafluoroethylene polymer filament having an orientation degree of 0.7 or more and having a microporous structure comprised of nodes interconnected by fibrils, thereby obtaining a yarn article of a tetrafluoroethylene polymer having a bulk density of 2.15 to 2.30, an orientation degree in an axial direction of 0.9 or more and a crystallinity of 85 % or more and exhibits peaks at 345 ± 5 °C and 380 ± 5 °C in the thermogram of differential scanning calorimetry in the course of temperature elevation at a rate of 10 °C/min.
Claim 6
Dependent Claim
124 words
A process for producing a yarn article comprising a tetrafluoroethylene polymer, which comprises drawing a tetrafluoroethylene polymer filament at a temperature of not lower than the melting point of said tetrafluoroethylene polymer filament, said tetrafluoroethylene polymer filament having an orientation degree of 0.7 or more and having a microporous structure comprised of nodes interconnected by fibrils, thereby obtaining a yarn article of a tetrafluoroethylene polymer having a bulk density of 2.15 to 2.30, an orientation degree in an axial direction of 0.9 or more and a crystallinity of 85 % or more and exhibits peaks at 345 ± 5 °C and 380 ± 5 °C in the thermogram of differential scanning calorimetry in the course of temperature elevation at a rate of 10 °C/min.
Claim 7
Dependent Claim
28 words
The process according to claim 4, wherein, prior to the drawing, said tetrafluoroethylene polymer filament is twisted at a twist ratio of 400 to 5,000 times per meter.
Claim 8
Dependent Claim
26 words
The process according to any of claims 4 or 5, wherein said tetrafluoroethylene polymer filament is drawn at a draw ratio of 1.5 to 10 times.
Claim 9
Dependent Claim
26 words
The process according to any of claims 4 to 6, wherein said tetrafluoroethylene polymer filament is drawn at a drawing temperature of 350 to 420 °C.
Claim 10
Dependent Claim
22 words
Use of the yarn article according to any of claims 1 to 3 for the production of woven fabrics, knits, and ropes.
References Cited (Backward Citations)
No citation records indexed.
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