US4145473A
Expired / Lapsed
US
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Antistatic filament having a polymeric sheath and a conductive polymeric core
Assignee: EIDP Inc
•
Filing: 1975-02-25
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Granted: 1979-03-20
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Expires: 1995-02-25
Abstract
Abstract An antistatic filament having a polymeric sheath and a conductive polymeric core of a defined nature, the core constituting less than 10% of the cross-sectional area of the filament.
Inventors
- 👤 Harry V. Samuelson
- 👤 Dean H. Smiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:28
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D02; D02G; D02G3/00; D02G3/44; D02G3/441; Y; Y10; Y10S; Y10S57/00; Y10S57/901; Y10S57/905; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T428/2973
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
An antistatic filament comprising a sheath of a fiber-forming synthetic polymer selected from the class of polyamides, polyesters and polyolefins and a core consisting essentially of an amorphous fluid-like organic polymer having a log R s of less than 10 and a glass transition temperature as measured by nuclear magnetic resonance, Tg (NMR) of less than 25° C., and selected from the group consisting of N-alkyl polyamides; polyether-esters; and ionically modified N-alkyl polyamides; ionically modified polyether-esters; and ionically modified aliphatic polyesters, with said ionically modified polymers having the ionic modifier copolymerized therewith, the said core constituting less than about 10% of the cross-sectional area of the filament.
Claim 2
Dependent Claim
107 words
An antistatic filament comprising a sheath of a fiber-forming synthetic polymer selected from the class of polyamides, polyesters and polyolefins and a core consisting essentially of an amorphous fluid-like organic polymer having a log R s of less than 10 and a glass transition temperature as measured by nuclear magnetic resonance, Tg (NMR) of less than 25° C., and selected from the group consisting of N-alkyl polyamides; polyether-esters; and ionically modified N-alkyl polyamides; ionically modified polyether-esters; and ionically modified aliphatic polyesters, with said ionically modified polymers having the ionic modifier copolymerized therewith, the said core constituting less than about 10% of the cross-sectional area of the filament.
Claim 3
Dependent Claim
16 words
The antistatic filament of claim 1 wherein the core is an N-alkyl polyamide or a polyether-ester.
Claim 4
Dependent Claim
21 words
An antistatic filament according to claim 1 wherein the core constitutes from about 2-6% of the cross-sectional area of the filament.
Claim 5
Dependent Claim
17 words
The antistatic filament of claim 2 wherein the core contains an ionic modifier dissolved in the polymer.
Claim 6
Dependent Claim
24 words
The antistatic filament of claim 1 wherein the fiber-forming synthetic polymer of the sheath is a polyamide and the core is an N-alkyl polyamide.
Claim 7
Dependent Claim
23 words
The antistatic filament of claim 1 wherein the fiber-forming synthetic polymer of the sheath is a polyamide and the core is a polyether-ester.
Claim 8
Dependent Claim
23 words
The antistatic filament of claim 1 wherein the fiber-forming synthetic polymer of the sheath is a polyester and the core is a polyether-ester.
Claim 9
Dependent Claim
15 words
An antistatic filament according to claim 1 having a log rho of less than 9.5.
Claim 10
Dependent Claim
20 words
An antistatic filament according to claim 1 wherein the core is ionically modified by having a phosphonium salt copolymerized therewith.
Claim 11
Dependent Claim
13 words
The antistatic filament of claim 1 wherein the fiber-forming sheath is a polyolefin.
Claim 12
Dependent Claim
12 words
The antistatic filament of claim 1 wherein the sheath is a polyamide.
Claim 13
Dependent Claim
12 words
The antistatic filament of claim 1 wherein the sheath is a polyester.
Claim 14
Dependent Claim
80 words
An antistatic filament comprising a sheath of a fiber-forming synthetic polymer selected from the class of polyamides, polyesters and polyolefins and a core consisting essentially of an amorphous fluid-like aliphatic polyester containing an ionic modifier dissolved therein and having a log R s of less than 10 and a glass transition temperature as measured by nuclear magnetic resonance, Tg (NMR) of less than 25° C., the said core constituting less than about 10% of the cross-sectional area of the filament.
Claim 15
Dependent Claim
80 words
An antistatic filament comprising a sheath of a fiber-forming synthetic polymer selected from the class of polyamides, polyesters and polyolefins and a core consisting essentially of an amorphous fluid-like aliphatic polyester containing an ionic modifier dissolved therein and having a log R s of less than 10 and a glass transition temperature as measured by nuclear magnetic resonance, Tg (NMR) of less than 25° C., the said core constituting less than about 10% of the cross-sectional area of the filament.
Claim 16
Dependent Claim
14 words
The antistatic filament of claim 13 wherein the ionic modifier is a phosphonium salt.
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |