US4251432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of providing curable fluoroelastomer gums having coupling agent coated particulate carbonaceous fillers
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1978-03-06
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Granted: 1981-02-17
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Expires: 1998-03-06
Abstract
Abstract Elastomer compositions comprising an elastomer gum curable to the solid, elastomeric state in the presence of an organic peroxide free radical initiator, a solid particulate filler, a hydrocarbon resin having a plurality of pendant vinyl groups per molecule, and an organic peroxide curative are described. Vulcanizates of such compositions are also described. Preferred are elastomer compositions comprising a fluoroelastomer gum curable to the solid, elastomeric state in the presence of an organic peroxide cure initiator and a carbonaceous filler coated with a 1,2-polybutadiene resin. Solid particulate fillers coated with a hydrocarbon resin having a plurality of pendant vinyl groups per molecule, such as 1,2-polybutadiene, are also described.
Inventors
- 👤 Jon W. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:28
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/08; C08K9/04; C08L; C08L27/00; C08L27/02; C08L27/12; C08L33/00; C08L33/04; C08L33/14; C08L33/16; C08L9/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A method for providing a curable composition which comprises: (A) coating a solid, particulate carbonaceous filler with a low viscosity hydrocarbon resin coupling agent having a plurality of pendant vinyl groups per molecule contained in a solvent, and evaporating the solvent to form the coated solid, carbonaceous particulate filler; (B) blending the coated solid, carbonaceous particulate filler with a fluoroelastomer gum capable of curing to a solid elastomeric state in the presence of an organic free radical peroxide initiator and an organic free radical peroxide initiator capable of effecting reaction between said fluoroelastomer gum and the pendant vinyl groups of the coupling agent.
Claim 2
Independent Claim
103 words
A method for providing a curable composition which comprises: (A) coating a solid, particulate carbonaceous filler with a low viscosity hydrocarbon resin coupling agent having a plurality of pendant vinyl groups per molecule contained in a solvent, and evaporating the solvent to form the coated solid, carbonaceous particulate filler; (B) blending the coated solid, carbonaceous particulate filler with a fluoroelastomer gum capable of curing to a solid elastomeric state in the presence of an organic free radical peroxide initiator and an organic free radical peroxide initiator capable of effecting reaction between said fluoroelastomer gum and the pendant vinyl groups of the coupling agent.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1 in which the carbonaceous filler is selected from the group consisting of carbon black, oxidized carbon black, thermal black and ground coal.
Claim 4
Dependent Claim
36 words
A method as claimed in claim 1 in which the fluoroelastomer gum is selected from the group consisting of copolymers of chlorotrifluoroethylene and vinylidene fluoride, polymers of 1,1-dihydroperfluoroalkyl acrylates, and copolymers of vinylidene fluoride and hexafluoropropylene.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 1 in which the coupling agent has an average molecular weight in the range from 300 to 700.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 1 in which the coupling agent has an average molecular weight of from 1000 to 5000.
Claim 7
Dependent Claim
15 words
A method as claimed in claim 1 in which the coupling agent is a 1,2-polybutadiene.
Claim 8
Dependent Claim
15 words
A method as claimed in claim 1 in which the coupling agent is a 3,4-polyisoprene.
Claim 9
Dependent Claim
26 words
A method as claimed in claim 1 in which the organic free radical peroxide initiator is selected from the group cosnisting of 2,5-di(t-butylperoxy)-2,5-dimethylhexyne-3,2,5-di(t-butylperoxy)-2,5-dimethylhexane, and dicumyl peroxide.
References Cited (Backward Citations)
US2879173A
Cited
US2906740A
Cited
US3340222A
Cited
US3431235A
Cited
US3519703A
Cited
US3759868A
Cited
US3755231A
Cited
US3853809A
Cited
US3881536A
Cited
US3930107A
Cited
US3971753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |