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US 8,623,963 B2Granted
High purity perfluoroelastomer composites and a process to produce the same
AssigneeW. L. Gore & Associates, Inc.
InventorsPing Xu, Jack Hegenbarth
Life of this patent
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Abstract
High purity perfluoroelastomer composites and processes for producing the same are provided. High purity composites may be formed from compositions comprising a crosslinkable fluoroelastomer terpolymer of TFE, PAVE, and CNVE, and functionalized PTFE, which may be crosslinked to form crosslinked composites having low metal content and low compression set. Emulsion mixtures for forming the high purity composites are also provided.
Claims40
An emulsion mixture comprising:
- i) a first emulsion of a composition comprising a crosslinkable fluoroelastomer terpolymer consisting essentially of tetrafluoroethylene (TFE), perfluoroalkyl vinyl ether (PAVE), and perfluorocyano vinyl ether (CNVE) monomer units and that contains no additional crosslinking agent, coagent or catalyst, and
- ii) a second emulsion comprising a functionalized polytetrafluoroethylene (PTFE) polymer comprising 0.1 to 3 mol % perfluorocyano vinyl ether (CNVE),
- wherein the particle size of the functionalized PTFE polymer is about 10 nm to 100 nm, and
- wherein a composite comprising functionalized PTFE-crosslinkable fluoroelastomer terpolymer isolated from an emulsion mixture of said first and second emulsions contains less than 3000 ppb of metals and is crosslinked in the absence of a crosslinking agent, coagent or catalyst.
1 more element
A crosslinkable composite comprising:
- i) a first composition comprising a crosslinkable fluoroelastomer terpolymer consisting essentially of tetrafluoroethylene (TFE), perfluoromethyl vinyl ether (PMVE) and perfluorocyano vinyl ether (CNVE) and containing no additional crosslinking agent, coagent or catalyst, and
- ii) a second composition comprising a functionalized polytetrafluoroethylene (PTFE) polymer comprising crosslinkable moieties having a particle size of 10 nm to 100 nm,
- wherein the crosslinkable composite has less than about 3000 ppb metal content, and
- wherein the crosslinkable composite is crosslinked in the absence of a crosslinking agent, coagent or catalyst to form a crosslinked composite that has a compression set of less than 50% when tested at 150° C.
1 more element
An emulsion mixture comprising:
- i) a first emulsion of a composition comprising a crosslinkable fluoroelastomer terpolymer consisting essentially of tetrafluoroethylene (TFE), perfluoroalkyl vinyl ether (PAVE), and perfluorocyano vinyl ether (CNVE) monomer units, and
- ii) a second emulsion comprising a functionalized polytetrafluoroethylene (PTFE) polymer comprising 0.1 to 3 mol % perfluorocyano vinyl ether (CNVE),
- wherein the particle size of the functionalized PTFE polymer is about 10 nm to 100 nm,
- wherein a composite comprising functionalized PTFE and crosslinkable fluoroelastomer terpolymer isolated from an emulsion mixture of said first and second emulsions is crosslinked in the absence of a crosslinking agent, coagent or catalyst, and
- wherein said composite contains less than 3000 ppb of metals and contains less than 2 ppm fluorosurfactant.
2 more elements
An emulsion mixture comprising:
- i) a first emulsion of a crosslinkable fluoroelastomer terpolymer consisting essentially of tetrafluoroethylene (TFE), perfluoroalkyl vinyl ether (PAVE), and perfluorocyano vinyl ether (CNVE) monomer units and that contains no additional crosslinking agent, coagent or catalyst,
- ii) a second emulsion of a functionalized polytetrafluoroethylene (PTFE) polymer comprising 0.1 to 3 mol % perfluorocyano vinyl ether (CNVE), and
- iii) a dispersion of at least one filler or additive,
- wherein the particle size of the functionalized PTFE polymer is about 10 nm to 100 nm,
- wherein a crosslinkable composite of i), ii) and ii) isolated from this emulsion mixture is crosslinked in the absence of a crosslinking agent, coagent or catalyst, and contains less than 3000 ppb of metals.
2 more elements
An emulsion mixture comprising:
- i) an emulsion of a composition comprising a crosslinkable fluoroelastomer terpolymer consisting essentially of tetrafluoroethylene (TFE), perfluoroalkyl vinyl ether (PAVE), and perfluorocyano vinyl ether (CNVE) monomer units and that contains no additional crosslinking agent, coagent or catalyst, and
- ii) an emulsion comprising a functionalized polytetrafluoroethylene (PTFE) polymer comprising 0.1 to 3 mol % perfluorocyano vinyl ether (CNVE), wherein a composite comprising functionalized PTFE-crosslinkable fluoroelastomer terpolymer isolated from this emulsion mixture is crosslinked in the absence of a crosslinking agent, coagent or catalyst and has a metal content less than 3000 ppb.
A crosslinkable composite comprising:
- i) a composition comprising a crosslinkable fluoroelastomer terpolymer consisting essentially of tetrafluoroethylene (TFE), perfluoromethyl vinyl ether (PMVE) and perfluorocyano vinyl ether (CNVE) and contains no additional crosslinking agent, coagent or catalyst, and
- ii) a composition comprising a functionalized polytetrafluoroethylene (PTFE) polymer comprising crosslinkable moieties, wherein the crosslinkable composite is crosslinked in the absence of a crosslinking agent, coagent or catalyst and when crosslinked and forms a crosslinked composite having a compression set of less than 50% when tested at 150° C., and
- wherein said crosslinkable composite has a metal content less than about 3000 ppb.
A crosslinked composite comprising:
- a crosslinked blend comprising:
- i) a crosslinkable fluoroelastomer terpolymer consisting essentially of tetrafluoroethylene (TFE), perfluoromethyl vinyl ether (PMVE) and perfluorocyano vinyl ether (CNVE), and
- ii) a functionalized polytetrafluoroethylene (PTFE) polymer comprising perfluorocyano vinyl ether (CNVE) crosslinkable moieties,
- wherein the blend was crosslinked in the absence of a crosslinking agent, coagent or catalyst, and the crosslinked composite has a compression set of less than 50% when tested at 150° C., and
- wherein said crosslinked composite has a metal content less than about 3000 ppb.
2 more elements
Dependencies are inferred from the claim text.