US3853809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of particulate fluorinated polymers and rubbers
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1973-07-16
•
Granted: 1974-12-10
•
Expires: 1993-07-16
Abstract
Abstract Particulate fluorinated polymers such as Teflon are incorporated into rubber bases by first predispersing Teflon powder into a low molecular weight hydrocarbon such as a liquid polybutadiene and then mixing this predispersion into the rubber base. If desired, the predispersion of Teflon and polybutadiene may be first converted into a free-flowing powder by the addition of a dry inert filler such as clay, carbon black, silica, alumina, etc., and then incorporated into the rubber base. Alternately, the Teflon-polybutadiene predispersion may be masterbatched with a small amount of the rubber matrix before being mixed into the rubber base.
Inventors
- 👤 J Jones
- 👤 J Martin
- 👤 J Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
C; C08; C08L; C08L21/00; C08J; C08J3/00; C08J3/005; C08K; C08K3/00; C08K3/10; C08K3/14; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/36; C08L23/00; C08L23/02; C08L23/16; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L9/00; C08L2205/00; C08L2205/03; C08L2310/00; C08L2312/00; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
A PEROXIDE-CURED, ELASTOMERIC, ORGANIC RUBBER BASE COMPOSITION COMPRISING: A LIQUID DERIVED 1, 2-POLYBUTADIENE HAVING A NUMBER AVERAGE MOLECULAR WEIGHT RANGE FROM ABOUT 500-10,000 AND $80% BUTADIENE GROUPS IN THE VINYL CONFIGURATION: 2-35% BY VOLUME OF THE TOTAL COMPOSITION; PARTICULATE FLUORINATED POLYMER SELECTED FROM THE CLASS CONSISTING OF: POLYTETRAFLUOROETHYLENE, POLYCHLOROTRIFLUOROETHYLENE, POLYVINYLFLUORIDE, POLYPERFLUOROBUTADIENE, POLYVINYLIDENE FLUORIDE AND COPOLYMERS OF VINYLIDENE FLUORIDE AND HEXAFLUOROPROPYLENE: 5%-80% BY WEIGHT IN THE POLYBUTADIENE POLYMER; THE SAID COMPOSITION FORMED BY PREDISPERSING THE FLUORINATED POLYMER INTO THE LIQUID POLYBUTADIENE TO FORM A PASTE; MIXING THE PASTE IN THE ORGANIC RUBBER BASE; AND CURING THE MIXTURE WITH A PEROXIDE CATALYST.
Claim 2
Dependent Claim
100 words
A PEROXIDE-CURED, ELASTOMERIC, ORGANIC RUBBER BASE COMPOSITION COMPRISING: A LIQUID DERIVED 1, 2-POLYBUTADIENE HAVING A NUMBER AVERAGE MOLECULAR WEIGHT RANGE FROM ABOUT 500-10,000 AND $80% BUTADIENE GROUPS IN THE VINYL CONFIGURATION: 2-35% BY VOLUME OF THE TOTAL COMPOSITION; PARTICULATE FLUORINATED POLYMER SELECTED FROM THE CLASS CONSISTING OF: POLYTETRAFLUOROETHYLENE, POLYCHLOROTRIFLUOROETHYLENE, POLYVINYLFLUORIDE, POLYPERFLUOROBUTADIENE, POLYVINYLIDENE FLUORIDE AND COPOLYMERS OF VINYLIDENE FLUORIDE AND HEXAFLUOROPROPYLENE: 5%-80% BY WEIGHT IN THE POLYBUTADIENE POLYMER; THE SAID COMPOSITION FORMED BY PREDISPERSING THE FLUORINATED POLYMER INTO THE LIQUID POLYBUTADIENE TO FORM A PASTE; MIXING THE PASTE IN THE ORGANIC RUBBER BASE; AND CURING THE MIXTURE WITH A PEROXIDE CATALYST.
Claim 3
Dependent Claim
21 words
The composition of claim 1 in which the said paste is converted into a free flowing powder with an inert filler.
Claim 4
Dependent Claim
24 words
The composition of claim 2 in which said filler is selected from the class consisting of: clay, carbon black, alumina, coal, sand and silica.
Claim 5
Dependent Claim
21 words
The composition of claim 2 comprising 10 - 50 parts by weight of filler per 5 parts by weight of paste.
References Cited (Backward Citations)
US2906123A
Cited
US3397166A
Cited
US3558538A
Cited
US3661823A
Cited
US3682859A
Cited
US3586661A
Cited
US3595851A
Cited
US3696062A
Cited
US3630974A
Cited
US3769370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |