Patent JPS514382A successfully refreshed from Google Patents.
US4075140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidizing carbon black and use of it in elastomers
Assignee: Phillips Petroleum Co
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Filing: 1976-04-19
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Granted: 1978-02-21
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Expires: 1996-04-19
Abstract
Abstract A considerable reduction in modulus, as well as a significant increase in scorch time of a carbon black-containing rubber composition is obtained if the carbon black has been previously oxidized with a very diluted aqueous nitric acid containing only about 0.05 to 1 wt. % of HNO 3 and dried at a temperature of about 400° to 550° F.
Inventors
- 👤 Harold R. Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:18
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C01; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A process to produce oxidized carbon black which comprises contacting said carbon black with an aqueous nitric acid having a concentration of about 0.05 to about 1 weight % with the weight ratio of HNO 3 to carbon black being in the range of about 5 × 10 -4 to about 1 × 10 -2 and drying the thus treated carbon black at a temperature in the range of about 400° to about 550° F.
Claim 2
Dependent Claim
75 words
A process to produce oxidized carbon black which comprises contacting said carbon black with an aqueous nitric acid having a concentration of about 0.05 to about 1 weight % with the weight ratio of HNO 3 to carbon black being in the range of about 5 × 10 -4 to about 1 × 10 -2 and drying the thus treated carbon black at a temperature in the range of about 400° to about 550° F.
Claim 3
Dependent Claim
22 words
A process in accordance with claim 1 wherein said carbon black is contacted with said aqueous nitric acid in a pelleting mill.
Claim 4
Dependent Claim
180 words
A process for treating carbon black so as to adjust and control the modulus and/or scorch time of a rubber composition containing said carbon black which comprises a. compounding a sample of said carbon black and a rubber into a rubber composition, b. determining the modulus and/or scorch time of said rubber composition, c. comparing said determined modulus and/or said determined scorch time with a preselected upper limit for the modulus and/or a preselected lower limit for the scorch time, d. if said determined modulus is above said upper limit for the modulus, and/or if said determined scorch time is below said lower limit for the scorch time oxidizing the carbon black by aa. contacting said carbon black with an aqueous nitric acid having a concentration of about 0.05 to about 1 weight % at a weight ratio of HNO 3 to carbon black in the range of about 5 × 10 -4 to 1 × 10 -2 , and bb. drying the thus treated carbon black at temperatures in the range of about 400° F to about 550° F.
Claim 5
Dependent Claim
180 words
A process for treating carbon black so as to adjust and control the modulus and/or scorch time of a rubber composition containing said carbon black which comprises a. compounding a sample of said carbon black and a rubber into a rubber composition, b. determining the modulus and/or scorch time of said rubber composition, c. comparing said determined modulus and/or said determined scorch time with a preselected upper limit for the modulus and/or a preselected lower limit for the scorch time, d. if said determined modulus is above said upper limit for the modulus, and/or if said determined scorch time is below said lower limit for the scorch time oxidizing the carbon black by aa. contacting said carbon black with an aqueous nitric acid having a concentration of about 0.05 to about 1 weight % at a weight ratio of HNO 3 to carbon black in the range of about 5 × 10 -4 to 1 × 10 -2 , and bb. drying the thus treated carbon black at temperatures in the range of about 400° F to about 550° F.
Claim 6
Dependent Claim
51 words
A process in accordance with claim 3 wherein said oxidizing steps are carried out by mixing dry carbon black with said aqueous nitric acid in a weight ratio of dry carbon black to aqueous nitric acid in the range of about 2:1 to about 1:2 and thereafter drying the resulting mixture.
Claim 7
Dependent Claim
22 words
A process in accordance with claim 4 wherein said carbon black and said aqueous nitric acid are mixed in a pelleting mill.
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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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |