US3940455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon polymers
Assignee: United States Department of the Navy
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Filing: 1970-08-31
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Granted: 1976-02-24
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Expires: 1990-08-31
Abstract
Abstract A technique for improving the tensile strength of extruded fibers by incorating Teflon into hydrocarbon polymers. These polymeric compositions have extensive application in improving the physical behavior, reliability, and long term storage stability of extruded propellants, pyrotechnics and explosives.
Inventors
- 👤 Martin H. Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/005; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C08L; C08L21/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A method of compounding an elastomeric polymeric composition which comprises dissolving an elastomeric polymer selected from the group consisting of butadiene-acrylonitrile rubber, ethylene-propylene rubber, butyl rubber, styrene-butadiene rubber, polyisoprene rubber, polychloroprene rubber, in a solvent selected from the group consisting of benzene, toluene, xylene, hexane, cyclohexane, petroleum ether to form a solution; incorporating into said solution polytetrafluoroethylene to form a suspension; coprecipitating said polymer and said polytetrafluoroethylene by mixing said suspension with a nonsolvent for said polymer whereby a precipitate forms; separating said precipitate from said solvent and drying said precipitate.
Claim 2
Independent Claim
91 words
A method of compounding an elastomeric polymeric composition which comprises dissolving an elastomeric polymer selected from the group consisting of butadiene-acrylonitrile rubber, ethylene-propylene rubber, butyl rubber, styrene-butadiene rubber, polyisoprene rubber, polychloroprene rubber, in a solvent selected from the group consisting of benzene, toluene, xylene, hexane, cyclohexane, petroleum ether to form a solution; incorporating into said solution polytetrafluoroethylene to form a suspension; coprecipitating said polymer and said polytetrafluoroethylene by mixing said suspension with a nonsolvent for said polymer whereby a precipitate forms; separating said precipitate from said solvent and drying said precipitate.
Claim 3
Dependent Claim
28 words
The method in accordance with claim 1 wherein said dry precipitate is banded on a rubber mill at 25° C. thereby improving the physical properties of said precipitate.
Claim 4
Dependent Claim
28 words
An elastomeric polymeric composition consisting essentially of an elastomeric polymer selected from the group consisting of butadiene-acrylonitrile, ethylene-propylene rubber, styrene-butadiene rubber, polyisoprene, polychloroprene, butyl rubber and a polytetrafluoroethylene.
Claim 5
Dependent Claim
28 words
An elastomeric polymeric composition consisting essentially of an elastomeric polymer selected from the group consisting of butadiene-acrylonitrile, ethylene-propylene rubber, styrene-butadiene rubber, polyisoprene, polychloroprene, butyl rubber and a polytetrafluoroethylene.
Claim 6
Dependent Claim
21 words
The composition in accordance with claim 3 wherein the elastomeric polymer consists essentially of from 15 to 90 percent by weight.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |