US4085182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing electrically conductive synthetic fibers
Assignee: Teijin Ltd
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Filing: 1975-10-08
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Granted: 1978-04-18
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Expires: 1995-10-08
Abstract
Abstract A process for producing sheath-core type electrically conductive synthetic composite filaments, which comprises simultaneously melt-extruding in a sheath/core filament configuration an electrically conductive core composition of a thermoplastic synthetic polymer containing an electrically conductive carbon black dispersed therein and a non-conductive sheath composition of a thermoplastic fiber-forming synthetic polymer, and taking up the extruded sheath-core type synthetic filaments at a take-up speed of at least 2,500 meters per minute; and an electrically conductive sheath-core type synthetic filament having a polyamide sheath.
Inventors
- 👤 Sumio Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:58
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/09; D01F8/00; D01F8/04; D01F8/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A process for producing sheath-core type electrically conductive synthetic composite filaments, which comprises simultaneously melt-extruding from a spinneret, in a sheath-core filament configuration, an electrically conductive core composition of polycapramide containing an electrically conductive carbon black dispersed therein, and a non-conductive sheath composition of polycapramide and taking up the extruded sheath-core type synthetic filaments at a take-up speed of at least 2,500 meters per minute, with the proviso that said process is carried out without a separate drawing step.
Claim 2
Dependent Claim
79 words
A process for producing sheath-core type electrically conductive synthetic composite filaments, which comprises simultaneously melt-extruding from a spinneret, in a sheath-core filament configuration, an electrically conductive core composition of polycapramide containing an electrically conductive carbon black dispersed therein, and a non-conductive sheath composition of polycapramide and taking up the extruded sheath-core type synthetic filaments at a take-up speed of at least 2,500 meters per minute, with the proviso that said process is carried out without a separate drawing step.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the take-up speed is 3,000 to 4,000 meters per minute.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the extruded sheath-core type synthetic filaments are taken up at a draft ratio of 80 to 600.
Claim 5
Dependent Claim
36 words
The process of claim 1 wherein the electrically conductive core composition contains the electrically conductive carbon black dispersed therein in an amount of 15 to 50% by weight based on the weight of the core composition.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the composite filaments have a core-to-sheath ratio of 2:98 to 30:70.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein a melt of the core composition is fed into the core side of the spinneret without filtering the composition.
Claim 8
Dependent Claim
37 words
The process of claim 1 wherein a melt of the core composition is fed into the core side of the spinneret after filtering said composition by means of a wire gauze of not more than 200 mesh.
Claim 9
Dependent Claim
52 words
The process of claim 1 wherein a melt of the core composition is fed into the core side of the spinneret after filtering said composition by means of a wire gauze of not more than 200 mesh and a granular filtering material having an average particle diameter of at least 150 microns.
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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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |