Patent US4239794A successfully refreshed from Google Patents.
US4239794A
Expired / Lapsed
US
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Process of dispersing electro-conductive carbon black and web product made thereby
Assignee: LCD ACQUISITION Corp
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Filing: 1978-08-04
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Granted: 1980-12-16
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Expires: 1998-08-04
Abstract
Abstract Novel process for dispersing electroconductive carbon black to make novel conductive web products and the dispersions produced therewith. The process comprises dispersing said carbon black in an aqueous media using tris (2,3 dibromopropyl) phosphate, or the like, as a dispersing agent and then coating a porous fibrous substrate with the resulting carbon black dispersion.
Inventors
- 👤 Adrien W. Allard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:02
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D06; D06M; D06M11/00; D06M11/73; D06M11/74; D06M13/00; D06M13/244; D06M13/282; D06M13/292; D06M13/298; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2418; Y10T442/2426
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
An electroconductive sheet formed of a permeable non-woven fibrous web comprising a maximum surface electroresistivity of about 200,000 ohms per square and carrying electroconductive an carbon black coating on the surfaces of the fibers from which said sheet is formed, said sheet being formed by a process comprising the steps of (1) dispersing said conductive carbon black in a latex binder using an effective quantity of a dispersing agent selected from a chlorinated organic dispersing agents and an organic phosphate dispersing agents, (2) impregnating the resulting dispersion of carbon black into said web and coating the surface of said fibers with said dispersion, and (3) drying residual water from the surface of the fibers, leaving a thin coating of carbon block dispersed on the surfaces of said fibers.
Claim 2
Dependent Claim
128 words
An electroconductive sheet formed of a permeable non-woven fibrous web comprising a maximum surface electroresistivity of about 200,000 ohms per square and carrying electroconductive an carbon black coating on the surfaces of the fibers from which said sheet is formed, said sheet being formed by a process comprising the steps of (1) dispersing said conductive carbon black in a latex binder using an effective quantity of a dispersing agent selected from a chlorinated organic dispersing agents and an organic phosphate dispersing agents, (2) impregnating the resulting dispersion of carbon black into said web and coating the surface of said fibers with said dispersion, and (3) drying residual water from the surface of the fibers, leaving a thin coating of carbon block dispersed on the surfaces of said fibers.
Claim 3
Dependent Claim
23 words
A web as defined in claim 1 wherein said impregnation is carried out while said dispersion has a maximum viscosity of about 100.
Claim 4
Dependent Claim
29 words
A web as defined in claim 1 wherein said impregnation is carried out using effective quantities of chlorinated dispersing agents and with dispersions of up to about 200,000 ohms.
Claim 5
Dependent Claim
34 words
A web as defined in any of claims 1, 2 or 3 wherein the electroconductive web weighs about 4 to 5 ounces per square yard, has a thickness of about 0.025 to 0.040 inches.
References Cited (Backward Citations)
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |