High Purity Perfluoroelastomer Composites And A Process To Produce The Same

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.

1 - 25 . (canceled) 
     
     
         26 . 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   ii) at least one additional material selected from fillers and additives, wherein the crosslinkable composite has less than about 3000 ppb metal content, and wherein the composite when crosslinked has a compression set of less than 50% when tested at 200° C.   
     
     
         27 . The composite of  claim 26 , wherein the composition further comprises SiO 2 . 
     
     
         28 . The composite of  claim 26 , wherein the compression set is less than about 40%. 
     
     
         29 . The composite of  claim 26 , wherein the compression set is less than about 30%. 
     
     
         30 . The composite of  claim 26 , wherein the compression set is less than about 20%. 
     
     
         31 . The composite of  claim 26 , wherein the at least one additional material is about 1 to 20 wt % of the composite. 
     
     
         32 . The composite of  claim 26 , wherein the crosslinkable fluoroelastomer terpolymer comprises 8-CNVE. 
     
     
         33 . The composite of  claim 26 , wherein the crosslinkable terpolymer has a metal content of less than about 2000 ppb. 
     
     
         34 . The composite of  claim 26 , wherein the crosslinkable terpolymer has a metal content of less than about 1000 ppb. 
     
     
         35 . The composite of  claim 26 , wherein the crosslinkable terpolymer has a metal content of less than about 500 ppb. 
     
     
         36 . The composite of  claim 26 , wherein the crosslinkable terpolymer has a metal content of less than about 200 ppb. 
     
     
         37 . The composite of  claim 26 , wherein the composite has a metal content of less than about 2000 ppb. 
     
     
         38 . The composite of  claim 26 , wherein the composite has a metal content of less than about 1000 ppb. 
     
     
         39 . The composite of  claim 26 , wherein the composite has a metal content of less than about 500 ppb. 
     
     
         40 . The composite of  claim 26 , wherein the crosslinkable terpolymer has a metal content of less than about 200 ppb. 
     
     
         41 . The composite of  claim 26 , wherein the composite has an APFO concentration of less than 2 ppm. 
     
     
         42 - 55 . (canceled) 
     
     
         56 . 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   ii) at least one additional material selected from fillers and additives,   
       wherein the crosslinkable composite has less than about 3000 ppb metal content and an APFO concentration of less than 2 ppm, and 
       wherein the composite when crosslinked has a compression set of less than 50% when tested at 200° C. 
     
     
         57 . 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   ii) a 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 contains no more than 2.0 ppm APFO, and further, 
       wherein when the PTFE and the fluoroelastomer terpolymer are crosslinked to form a crosslinked composite, the crosslinked composite has a compression set of less than 50% when tested at 150° C.