Patent US3978019A successfully refreshed from Google Patents.
US3978019A
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Process for production of deep colored small particle size gas black with low content of extractable matter
Assignee: Evonik Operations GmbH
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Filing: 1975-01-28
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Granted: 1976-08-31
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Expires: 1995-01-28
Abstract
Abstract Deeply colored carbon black having a low content of extractable matter and a primary particle size of about 8-25 nanometers is made by the gas black process using as the carrier gas for the vapors of the carbon black forming oil a hydrogen rich mixture containing over about 50 volume % hydrogen and then collecting the separated carbon black deposited on a cooling roll.
Inventors
- 👤 Alfred Oelmann
- 👤 Claus Richard Engel
- 👤 Lothar Rothbuhr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:38
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/19
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
In a process of preparing carbon black employing a cooling roll, for deposition of carbon black particles by the gas black process employing a carrier gas and vapor of a carbon black forming oil the improvement comprising preparing deeply colored carbon black with low extractable matter content having a primary particle size of about 8 to 25 nm by utilizing as the carrier gas at least about 50 volume % of hydrogen and collecting the carbon black deposited on the cooling roll.
Claim 2
Dependent Claim
82 words
In a process of preparing carbon black employing a cooling roll, for deposition of carbon black particles by the gas black process employing a carrier gas and vapor of a carbon black forming oil the improvement comprising preparing deeply colored carbon black with low extractable matter content having a primary particle size of about 8 to 25 nm by utilizing as the carrier gas at least about 50 volume % of hydrogen and collecting the carbon black deposited on the cooling roll.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the hydrogen is about 50 to 85 volume % of the carrier gas.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the hydrogen is at least about 59 volume % of the carrier gas.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the hydrogen is at least 70 volume % of the carrier gas.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein the hydrogen is 70 to 85 volume % of the carrier gas.
Claim 7
Dependent Claim
20 words
The process of claim 3 wherein the gas black prepared has a toluene extractable content of not over about 0.10%.
Claim 8
Dependent Claim
38 words
The process of claim 6 wherein the apparatus for collecting the carbon black formed comprises said roll and a filter and the carbon black deposited on the roll is collected separately from the carbon black in the filter.
Claim 9
Dependent Claim
29 words
In a composition comprising a polymer and carbon black as a coloring agent therefor, the improvement comprising employing as the carbon black the carbon black formed in claim 1.
Claim 10
Dependent Claim
29 words
In a composition comprising a polymer and carbon black as a coloring agent therefor, the improvement comprising employing as the carbon black the carbon black formed in claim 4.
Claim 11
Dependent Claim
13 words
A composition according to claim 9 wherein the polymer is a synthetic resin.
References Cited (Backward Citations)
US1811854A
Cited
US2665194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |