Perfluoroelastomeric compositions and seals having improved chemical resistance and methods of making the same
DCFirst Claim
1. A seal for preventing the leakage of a fluid between a first member and a second member and having improved chemical resistance to the fluid and reduced coefficients of friction at a surface of the seal, the seal comprising a mixture of:
- a perfluoroelastomer anda particulate fluorinated graphite having a composition of (CFx)n where x ranges from about 0.25 to about 1.20 and n is at least about 103.
2 Assignments
Litigations
0 Petitions
Accused Products
Abstract
An elastomeric composition having improved resistance to chemical attack is provided, the elastomeric composition including a perfluoroelastomer and a non-fibrillating particulate fluorographite. Also, a process for improving the processibility and resistance to chemical attack of a perfluoroelastomer is provided, in which the perfluoroelastomer is mixed with a non-fibrillating fluorocarbon particulate polymer to form a elastomeric composition which is processed at a temperature less than the melting temperature of the non-fibrillating fluorocarbon particulate polymer to disperse the fluorocarbon polymer throughout the perfluoroelastomer while maintaining the fluorocarbon polymer in particulate form. A method of making a seal which is resistant to chemical attack for preventing the leakage of a fluid between a first member and a second member is also provided.
55 Citations
14 Claims
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1. A seal for preventing the leakage of a fluid between a first member and a second member and having improved chemical resistance to the fluid and reduced coefficients of friction at a surface of the seal, the seal comprising a mixture of:
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a perfluoroelastomer and a particulate fluorinated graphite having a composition of (CFx)n where x ranges from about 0.25 to about 1.20 and n is at least about 103. - View Dependent Claims (2, 3)
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4. A method for increasing the resistance to chemical attack of an elastomeric seal and decreasing the coefficients of friction at a surface of the seal, the seal being for preventing the leakage of a fluid between a first member and a second member, comprising:
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mixing a perfluoroelastomer with a non-fibrillating fluorocarbon particulate polymer and a particulate fluorinated graphite having a composition of (CFx)n where x ranges from about 0.25 to about 1.20 and n is at least about 103 to form an elastomeric composition; and processing the elastomeric composition at a temperature less than the melting temperature of the non-fibrillating fluorocarbon particulate polymer to disperse the fluorocarbon polymer and the fluorinated graphite throughout the elastomeric composition while maintaining the fluorocarbon polymer and the fluorinated graphite in particulate form to form an elastomeric seal, such that the seal has increased resistance to chemical attack and reduced coefficients of friction at the seal surface. - View Dependent Claims (5, 6, 7, 8)
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9. A method for increasing the resistance to chemical attack of an elastomeric seal and decreasing the coefficients of friction at a surface of the seal, the seal being for preventing the leakage of a fluid between a first member and a second member, comprising:
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mixing a perfluoroelastomer with a non-fibrillating fluorocarbon particulate polymer to form an elastomeric composition, wherein the perfluoroelastomer comprises a terpolymer of tetrafluoroethylene, a perfluoroalkyl vinyl ether and a perfluorinated cure site monomer which includes a functional group which permits crosslinking of the terpolymer; and processing the elastomeric composition at a temperature less than the melting temperature of the non-fibrillating fluorocarbon particulate polymer to disperse the fluorocarbon polymer throughout the elastomeric composition while maintaining the fluorocarbon polymer in particulate form to form an elastomeric seal, such that the seal has increased resistance to chemical attack and reduced coefficients of friction at the seal surface. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification