Patent US3853809A successfully refreshed from Google Patents.
US3853809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of particulate fluorinated polymers and rubbers
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1973-07-16
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Granted: 1974-12-10
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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 03:03
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.
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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 |