Patent ID: 9068069
Filing Date: 2015-06-30
Classification: C08K,C08L,Y10T

Abstract:
1. A curable perfluoroelastomeric composition comprising: a first curable perfluoropolymer comprising tetrafluoroethylene, a first perfluoroalkylvinyl ether and at least one first cure site monomer having a cure site, wherein a molar ratio of the tetrafluoroethylene to the perfluoroalkylvinyl ether is about 0:100 to about 65:35 molar percentage in the perfluoropolymer; a second curable perfluoropolymer comprising tetrafluoroethylene, a second perfluoroalkylvinyl ether which may be the same or different from the first perfluoroalkylvinyl ether, and at least one second cure site monomer having a cure site which may be the same or different from the at least one first cure site monomer, wherein a molar ratio of the tetrafluoroethylene to the second perfluoroalkylvinyl ether is about 65:35 to about 95:5 in the polymer, and wherein when the first and second curable perfluoropolymers include the same monomers, the molar ratio of the tetrafluoroethylene to the second perfluoroalkylvinyl ether in the second curable perfluoropolymer is different from the molar ratio of the tetrafluoroethylene to the first perfluoroalkylvinyl ether of the first curable perfluoropolymer; and at least one curative capable of curing the at least one first cure site monomer and the at least one second cure site monomer, wherein the composition comprises from about 0.6 to about 0.9 weight percentage of the curative, wherein the weight percentage ratio of the first perfluoropolymer to the second perfluoropolymer in the composition is about 65:35 to about 35:65 and, wherein upon cure the cured compositions have a compression set of less than 25% at 70 hours at 300° C. and are plasma resistant upon exposure to NF