US4005170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of pelletized carbon blacks
Assignee: Cabot Corp
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Filing: 1975-10-16
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Granted: 1977-01-25
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Expires: 1995-10-16
Abstract
Abstract A wet pelletizing process for preparing improved carbon black pellets having controlled size, uniformity and bulk handling properties, wherein fluffy carbon black is intimately mixed with a portion of the liquid medium required for pellet formation prior to adding the remainder of the liquid medium during pelletization.
Inventors
- 👤 Howard R. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:30
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; B; B01; B01J; B01J2/00; B01J2/12; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K9/00; C08K9/08; C01; C01P; C01P2004/00; C01P2004/51; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
In a process for wet pelletizing carbon black wherein fluffy carbon black is agitated in a pelletizer in the presence of sufficient pelletizing liquid to agglomerate the particles of carbon black into free-flowing pellets, the improvement comprising: a. intimately admixing said fluffy carbon black with a portion of about 3 to about 75% of said pelletizing liquid in a mixer having rotational means operating at a speed in excess of 550 r.p.m., and b. agitating the resulting wet mixed carbon black with the remaining portion of said pelletizing liquid to agglomerate said carbon black into said free-flowing pellets.
Claim 2
Dependent Claim
98 words
In a process for wet pelletizing carbon black wherein fluffy carbon black is agitated in a pelletizer in the presence of sufficient pelletizing liquid to agglomerate the particles of carbon black into free-flowing pellets, the improvement comprising: a. intimately admixing said fluffy carbon black with a portion of about 3 to about 75% of said pelletizing liquid in a mixer having rotational means operating at a speed in excess of 550 r.p.m., and b. agitating the resulting wet mixed carbon black with the remaining portion of said pelletizing liquid to agglomerate said carbon black into said free-flowing pellets.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said pelletizing liquid is water.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the portion of pelletizing liquid in step (a) is about 10 to about 50% of said pelletizing liquid.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein said rotational means in said mixer is operated at a speed of about 3500 to about 6500 r.p.m.
References Cited (Backward Citations)
US3406426A
Cited
US3333038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |