Abstract: Blends of a perfluoroelastomer with a nitrile containing polyperfluoroether are described. The addition of the polyperfluoroether often improves the properties, processability and/or low temperature properties of the perfluoroelastomer. It is preferred if the perfluoroelastomer contains nitrile groups so that the two polymers can cocure, thereby retarding separation of the polyperfluoroether from the perfluoroelastomer.

Abstract: Nitrile containing perfluoroelastomers are cured by a combination of a peroxide, a coagent, and a catalyst which causes crosslinks to form using the nitrile groups. The method is relatively fast and economical, and gives vulcanizates which have excellent high temperature properties. Triphenyltin hydroxide is an exceptionally good catalyst for the formation of crosslinks from nitrile groups in perfluoroelastomers.

Abstract: Nitrile containing perfluoroelastomers are cured by a combination of a peroxide, a coagent, and a catalyst which causes crosslinks to form using the nitrile groups. The method is relatively fast and economical, and gives vulcanizates which have excellent high temperature properties. Triphenyltin hydroxide is an exceptionally good catalyst for the formation of crosslinks from nitrile groups in perfluoroelastomers.

Abstract: Perfluoroelastomers cured by radiation and characterized by an absence of curing agent residues in the cured product.

Abstract: Perfluoroelastomers characterized by low molecular weight and freedom form color-forming impurities can be prepared by pyrolysis techniques, and are useful in pellicle coatings and other optical applications.

Abstract: A novel process for making fluoropolymer-fiber composites is disclosed, which produces composites with improved physical properties. The composites are useful in parts that require chemical and/or thermal stability, as in chemical process equipment.

Abstract: Pellicles having films bearing at least one coating of perfluoropolymers as an antireflective surface, the perfluoropolymers comprising a low molecular weight perfluoropolymer having randomly copolymerized units of tetrafluoroethylene, perfluoro (alkyl vinyl) ether and a cure site monomer, the cure site monomer selected from the group consisting of vinylidene fluoride, perfluoro-(8-cyano-5-methyl-3,6-dioxa-1-octene), bromotetrafluorobutene or perfluoro (2-phenoxypropyl vinyl ether). Pellicles of this type are dust defocusing covers for photomasks and reticles used to project patterns onto light sensitive substrates such as photoresist-coated semiconductor wafers which are used in the manufacture of integrated circuits.

Abstract: A melt-processable thermoplastic composition consisting essentially of a blend of a melt processable thermoplastic fluorocarbon polymer and about 0.05 to about 0.5 percent by weight of an elastomeric copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) exhibits improved processing properties.

Abstract: In the preparation of perfluoropolymers by the interpolymerization of tetrofluoroethylene, perfluro (alkyl vinyl) ether and cyano-cure site monomer, the improvement of incorporating iodo moieties by the reaction of iodo-compounds of the formula RI.sub.n, in which R is a hydrocarbon or halocarbon radical of 1 to 8 carbon atoms and n is 1 or 2.

Abstract: A process for the preparation of perfluoropolymer by the random interpolymerization of tetrafluoroethylene, perfluoro (alkyl vinyl) ether and bromo curesite reactant, and the improvement wherein the interpolymerization reactants further comprise compounds of the formula RI.sub.n, in which R is a hydrocarbon or halocarbon radical and n is 1 or 2.

Abstract: Perfluoropolymers prepared from tetrofluoroethylene, perfluro (alkyl vinyl) ether and cyano-cure site monomer, and further comprising iodo moieties, and cured elastomers prepared from the perfluoropolymers.

Abstract: Pellicles having films bearing at least one coating of perfluoropolymers as an anti-reflective surface, the perfluoropolymers being copolymerized units of tetrafluoroethylene and perfluro (alkyl vinyl) ether, and further comprising iodo moieties.

Abstract: Bromo-containing perfluoropolymrs prepared from tetrofluoroethylene and perfluro (alkyl vinyl) ether and further comprising iodo moieties, and cured perfluoroelastomers prepared therefrom.

Abstract: Fluoroelastomer laminates having one layer of perfluoroelastomer with an ethylenically unsaturated hydrogen or perfluorophenyl and bromo- or iodo- cure site components and compounded with a K.sub.2 AF curing system and a second layer of peroxide-curable polymer compounded with a peroxide curing agent. The laminates exhibit excellent high temperature adhesion and oxidative and fluid resistance.

Abstract: A composition and method for preparing it is disclosed. The composition in a blend of a cured fluoroelastomer which except for the cure sites is a perfluorocarbon and a thermoplastic copolymer of tetrafluoroethylene which is present as generally spherical particles having a particle size of less than 10 microns. The composition is prepared by blending the fluoroelastomer and thermoplastic copolymer at a temperature above the melting point of the thermoplastic copolymer followed by curing the fluoroelastomer.