US3660133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the modification of carbon black
Assignee: KONINKL ZWAVELZUURFABRIEKEN V
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Filing: 1969-05-26
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Granted: 1972-05-02
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Expires: 1989-05-26
Abstract
Abstract Carbon black, in the dry state, is reacted with gaseous sulphur trioxide to increase the ability of the resulting modified carbon black to impart long flow characteristics to printing inks in which it is employed as pigment without increasing the content of volatile substances and without affecting the other pigment properties of the carbon black.
Inventors
- 👤 Abraham Van Der Schuyt
- 👤 Kornelis Gerrit Wolthuis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:49
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
The process according to claim 1, in which the carbon black to be reacted with the sulphur trioxide has a moisture content of less than 0.1 percent by weight.
Claim 2
Dependent Claim
51 words
The process according to claim 1, in which the carbon black and sulphur trioxide are initially brought into contact with each other at room temperature, and the reaction between the carbon black and the sulphur trioxide is promoted by then heating the contacting carbon black and sulphur trioxide to said temperature.
Claim 3
Dependent Claim
37 words
The process according to claim 1, in which the carbon black is heated to said temperature, and said sulphur trioxide is passed into contact with the thus heated carbon black with the aid of a carrier gas.
Claim 4
Dependent Claim
30 words
The process according to claim 1, in which said amount of sulphur trioxide is selected to provide said reaction product with a pH in the range between 2.5 and 5.
Claim 5
Dependent Claim
55 words
The process according to claim 1, in which the treated carbon black which is the product of the reaction of sulphur trioxide with carbon black has its pH adjusted by heating said treated carbon black to a temperature above 300* C. and passing therethrough a gas selected from the group consisting of air and nitrogen.
Claim 6
Dependent Claim
56 words
The process according to claim 1, in which the treated carbon black which is the product of the reaction of sulphur trioxide with the starting carbon black has its pH adjusted by heating said treated carbon black with a quantity of said starting carbon black to a temperature in the range between 100* and 300* C.
Claim 7
Dependent Claim
35 words
The process according to claim 1, in which the treated carbon black which is the product of the reaction of sulphur trioxide with carbon black has its pH increased by contacting the same with NH3.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |