US3867326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precipitated silica reinforcing agents and rubber compositions containing same
Assignee: Cabot Corp
•
Filing: 1973-12-13
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Granted: 1975-02-18
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Expires: 1993-12-13
Abstract
Abstract Improved reinforced rubber compositions are provided by dispersion into a vulcanizable rubber of dehydrated precipitated silicas in combination with polyethylenimine.
Inventors
- 👤 Donald Rivin
- 👤 George R Cotten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:48
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; B; B82; B82Y; B82Y30/00; C08K5/00; C08K5/16; C08K5/17; C08K9/00; C08K9/12; C08L; C08L21/00; C08L79/00; C08L79/04; C08L79/08; C08L9/00; C08L9/06; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/80; C01P2006/82; C01P2006/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
A SILICEOUS RUBBER REINFORCING COMPOSITION COMPRISING: A. PRECIPITATED DEHYDRATED SILICA HAVING AN AVERAGE ULTIMATE PARTICLE DIAMETER OF BETWEEN ABOUT 10 AND ABOUT 100 MILLIMICRONS; A BE1-N2 SURFACE AREA OF BETWEEN ABOUT 40 AND ABOUT 275 M2/G AND A FREE WATER CONTENT OF LESS THAN ABOUT 3 PERCENT BY WEIGHT THEREOF, AND B. BETWEEN ABOUT 0.5 AND ABOUT 6 PERCENT BY WEIGHT OF SAID PRECIPITATED SILICA OF POLYETHYLENIMINE.
Claim 2
Dependent Claim
67 words
A SILICEOUS RUBBER REINFORCING COMPOSITION COMPRISING: A. PRECIPITATED DEHYDRATED SILICA HAVING AN AVERAGE ULTIMATE PARTICLE DIAMETER OF BETWEEN ABOUT 10 AND ABOUT 100 MILLIMICRONS; A BE1-N2 SURFACE AREA OF BETWEEN ABOUT 40 AND ABOUT 275 M2/G AND A FREE WATER CONTENT OF LESS THAN ABOUT 3 PERCENT BY WEIGHT THEREOF, AND B. BETWEEN ABOUT 0.5 AND ABOUT 6 PERCENT BY WEIGHT OF SAID PRECIPITATED SILICA OF POLYETHYLENIMINE.
Claim 3
Dependent Claim
21 words
The composition of claim 1 wherein said precipitated dehydrated silica of (a) is treated so as to reduce the hygroscopicity thereof.
Claim 4
Dependent Claim
23 words
The composition of claim 2 wherein said dehydrated precipitated silica is treated by calcination thereof at temperatures of between about 600* and 1000*C.
Claim 5
Dependent Claim
24 words
The composition of claim 3 wherein said dehydrated precipitated silica is treated by calcination thereof at temperatures of between about 650* and about 800*C.
Claim 6
Dependent Claim
20 words
The composition of claim 1 wherein said polyethylenimine has an average molecular weight of between about 600 and about 5,000.
Claim 7
Dependent Claim
30 words
The composition of claim 1 wherein said polyethylenimine is present in the amount of between about 1 to 5 percent by weight of the dehydrated precipitated silica component of (a).
Claim 8
Dependent Claim
25 words
The composition of claim 1 wherein said dehydrated precipitated silica of (a) has a moisture content of less than about 2 percent by weight thereof.
References Cited (Backward Citations)
US3431231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |