US5213892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic core-sheath filament
Assignee: Hoechst AG
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Filing: 1990-07-13
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Granted: 1993-05-25
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Expires: 2010-07-13
Abstract
Abstract Antistatic synthetic bicomponent filaments of the core-sheath type have a core of increased electrical conductivity comprising a synthetic polymer in which solid, electrically conductive particles have been dispersed and a sheath of increased conductivity comprising a filament-forming polymer which contains one or more conventional antistats.
Inventors
- 👤 Werner Bruckner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:28
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/34; D01F; D01F1/00; D01F1/02; D01F1/09; D01F8/00; D01F8/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
An antistatic synthetic bicomponent filament of the core-sheath type with an electrically conductive cores and an electrically conductive sheath, the core comprising a synthetic polymer in which solid, electrically conductive particles are dispersed, and the sheath comprising a filament-forming polymer containing one or more conventional antistats based on sulfonato-or carboxylato-containing organic compounds of low diffusivity, and wherein from 5 to 60% by weight of conductive carbon or from 60 to 80% by weight of semiconductor materials are finely dispersed in the core.
Claim 2
Dependent Claim
82 words
An antistatic synthetic bicomponent filament of the core-sheath type with an electrically conductive cores and an electrically conductive sheath, the core comprising a synthetic polymer in which solid, electrically conductive particles are dispersed, and the sheath comprising a filament-forming polymer containing one or more conventional antistats based on sulfonato-or carboxylato-containing organic compounds of low diffusivity, and wherein from 5 to 60% by weight of conductive carbon or from 60 to 80% by weight of semiconductor materials are finely dispersed in the core.
Claim 3
Dependent Claim
25 words
The bicomponent filament as claimed in claim 1, wherein the solid conductive particles of the core material consist of conductive carbon or of semiconductor materials.
Claim 4
Dependent Claim
30 words
The bicomponent filament as claimed in claim 1, wherein the solid conductive particles of the core material consist of highly conductive carbon black or of antimony- or iodine-doped tin oxide.
Claim 5
Dependent Claim
29 words
The bicomponent filament as claimed in claim 1, wherein the antistat of the sheath is the metal salt of a sulfonic or carboxylic acid with a long-chain aliphatic moiety.
Claim 6
Dependent Claim
29 words
The bicomponent filament as claimed in claim 1, wherein the antistat of the sheath is a metal salt of an alkanesulfonic acid of from 8 to 30 carbon atoms.
Claim 7
Dependent Claim
22 words
The bicomponent filament as claimed in claim 1, wherein the antistat of the sheath is a metal salt of sodium or potassium.
Claim 8
Dependent Claim
24 words
The bicomponent filament as claimed in claim 1, wherein the polymer of the core has a lower melting point than that of the sheath.
Claim 9
Dependent Claim
20 words
The bicomponent filament as claimed in claim 1, wherein the polymer of the core is polyethylene or a block polyether-ester.
Claim 10
Dependent Claim
20 words
The bicomponent filament as claimed in claim 1, wherein the polymer of the sheath is a polyamide or a polyester.
Claim 11
Dependent Claim
14 words
A sheet-like filamentary material comprising the antistatic synthetic bicomponent filament defined in claim 1.
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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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |