US4279880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetylene black with high electrical conductivity and high absorptive power
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1979-09-11
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Granted: 1981-07-21
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Expires: 1999-09-11
Abstract
Abstract Carbon blacks having a carbon content greater than 99%, a mean particle diameter of 250 to 300 A, an electrical resistivity, measured under a pressure of 6.3 bars, of 0.270 to 0.350 ohm.cm and a DBP index of 400 to 500 ml per 100 g of black are disclosed together with a process for their preparation by incomplete combustion of acetylene in air. These blacks may be used especially for the manufacture of electric cells.
Inventors
- 👤 Claude Giet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:04
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/54; H; H01; H01M; H01M4/00; H01M4/02; H01M4/62; H01M4/624; H01M4/625; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/40; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
A carbon black having a carbon content greater than 99%, a mean particle diameter of 250 to 300 A, an electrical resistivity, measured under a pressure of 6.3 bars, of 0.270 to 0.350 ohm.cm and a DBP index of 400 to 500 ml per 100 g of black.
Claim 2
Dependent Claim
48 words
A carbon black having a carbon content greater than 99%, a mean particle diameter of 250 to 300 A, an electrical resistivity, measured under a pressure of 6.3 bars, of 0.270 to 0.350 ohm.cm and a DBP index of 400 to 500 ml per 100 g of black.
Claim 3
Dependent Claim
67 words
A process for the preparation of a carbon black as defined in claim 1 which comprises effecting the incomplete combustion of acetylene with air by contacting in a furnace the acetylene with air preheated to a temperature at least equal to 600° C., the amounts of acetylene and air introduced being such that the molar ratio oxygen/acetylene is less than 1 and at least equal to 0.08.
Claim 4
Dependent Claim
19 words
The process according to claim 2 in which the molar ratio oxygen/acetylene is less than or equal to 0.20.
Claim 5
Dependent Claim
21 words
The process according to claim 2 in which the acetylene is preheated to a temperature which does not exceed 150° C.
Claim 6
Dependent Claim
30 words
The process according to claim 2 in which the walls of the furnace are heated by an external source of heat to a temperature at least equal to 1500° C.
Claim 7
Dependent Claim
76 words
A process for the preparation of a carbon black as defined in claim 1 which comprises effecting the incomplete combustion of acetylene with air by contacting in a combustion zone the acetylene with air preheated to a temperature at least equal to 600° C., the amounts of acetylene and air being such that the molar ratio oxygen/acetylene is less than 1 and at least equal to 0.08, and separating the carbon black from the resultant aerosol.
Claim 8
Dependent Claim
19 words
The process according to claim 6 in which the molar ratio oxygen/acetylene is less than or equal to 0.20.
Claim 9
Dependent Claim
21 words
The process according to claim 6 in which the acetylene is preheated to a temperature which does not exceed 150° C.
Claim 10
Dependent Claim
30 words
The process according to claim 6 in which walls of the combustion zone are heated by an external source of heat to a temperature at least equal to 1500° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |