US4000166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition of silicone gum rubber to phosphonitrilic fluoroelastomers to improve mill processing low temperature flexibility and volume swell in low aromatic content fluids
Assignee: Bridgestone Firestone Inc
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Filing: 1975-04-07
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Granted: 1976-12-28
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Expires: 1995-04-07
Abstract
Abstract Improvements in mill processing, low temperature flexibility and volume swell in fluids with low aromatic contents result from the addition of silicone gum rubbers to phosphonitrilic fluoroelastomers.
Inventors
- 👤 Joseph F. Witner
- 👤 Gary S. Kyker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:06
CPC Classifications
C; C08; C08L; C08L85/00; C08L85/02; C08K; C08K5/00; C08K5/36; C08L83/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A phosphonitrilic fluorelastomer composition possessing enhanced processibility, low temperature flexibility and slightly increased volume swell in petroleum based hydraulic fluids consisting essentially of: 1. a fluoroelastomer consisting of alternating P and N atoms and the substituents attached to the P atoms are principally fluoroalkoxy groups and include at least some unsaturated groups; and 2. between about 1 and 20 parts of silicone gum rubber per 100 parts of fluoroelastomer, blended therewith.
Claim 2
Dependent Claim
71 words
A phosphonitrilic fluorelastomer composition possessing enhanced processibility, low temperature flexibility and slightly increased volume swell in petroleum based hydraulic fluids consisting essentially of: 1. a fluoroelastomer consisting of alternating P and N atoms and the substituents attached to the P atoms are principally fluoroalkoxy groups and include at least some unsaturated groups; and 2. between about 1 and 20 parts of silicone gum rubber per 100 parts of fluoroelastomer, blended therewith.
Claim 3
Dependent Claim
10 words
The composition of claim 1 including in addition a filler.
Claim 4
Dependent Claim
70 words
The composition of claim 2 wherein the filler is selected from the group consisting of: a. 5 to 50 parts of silica fillers per 100 parts of elastomer; b. 5 to 50 parts of silica fillers plus 2 to 30 parts of carbon black per 100 parts of elastomer; and c. 5 to 50 parts of silica fillers plus 2 to 50 parts of graphite per 100 parts of fluoroelastomer.
Claim 5
Dependent Claim
17 words
The composition of claim 1 wherein there are at least two different fluoroalkoxy groups in the elastomer.
Claim 6
Dependent Claim
23 words
The composition of claim 4 wherein the groups are -OCH 2 CF 3 and -OCH 2 (CF 2 ) 3 CF 2 H.
Claim 7
Dependent Claim
30 words
The process of enhancing the mill processing of phosphonitrilic fluoroelastomers which comprises incorporating from about 1 to 20 parts of silicone gum rubber in each 100 parts of said fluoroelastomer.
Claim 8
Dependent Claim
30 words
The process of enhancing the mill processing of phosphonitrilic fluoroelastomers which comprises incorporating from about 1 to 20 parts of silicone gum rubber in each 100 parts of said fluoroelastomer.
References Cited (Backward Citations)
US3326852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |