Abstract: The subject invention relates to segmented fluoropolymers of the A-B-A type where A is a crystallizable fluoropolymer segment, and B is a base-resistant elastomeric fluoropolymer segment, the segmented fluoropolymers being useful as thermoplastic fluoroelastomers which are highly resistant to attack by bases. The fluoroelastomers are useful, for example, in O-rings and shaft seals in internal combustion engines using aggressive oils and in oil well applications.

Abstract: Fluoroelastomer compositions with terminal iodo groups and having improved low temperature properties in the cured state.

Abstract: Base-resistant peroxide-curable fluoroelastomers with improved processibility comprising a polymeric chain having tetrafluroethylene as one comonomer copolymerized with monomer units selected from the group (a) propylene, (b) propylene and vinylidene fluoride and (c) a C.sub.2-3 hydrocarbon olefin and one or more perfluoro(alkyl vinyl ethers); said polymer chains having terminal iodo-groups.

Abstract: Base-resistant peroxide-curable fluoroelastomers with improved processibility comprising a polymeric chain having tetrafluoroethylene as one comonomer copolymerized with monomer units selected from the group (a) propylene, (b) propylene and vinylidene fluoride and (c) a C.sub.2-3 hydrocarbon olefin and one or more perfluoro(alkyl vinyl ethers); said polymer chains having terminal iodo-groups.

Abstract: A composition that exhibits low tendency to foul mold cavities comprising a fluoroelastomer of vinylidene fluoride units and units of at least one other fluorine-containing monomer copolymerizable with vinylidene fluoride; a bisphenol or a polyhydroxy phenol crosslinking agent of the formula ##STR1## where R is H, alkyl or aryl and R' is alkyl or aryl; a divalent metal oxide or hydroxide; and 0.2-4 parts by weight per 100 parts by weight fluoroelastomer of a crosslinking accelerator which is a quaternary ammonium salt of the formula R".sub.4 N.sup.+ X.sup.- wherein each R" is independently an alkyl group of 2-10 carbon atoms or an aralkyl group of 7-10 carbon atoms and X.sup.- is selected from the group consisting of fluoride, dihydrogen phosphate, periodate, acetate, hydrogen sulfate, methane sulfonate, toluene sulfonate, or an anion of a bisphenol or a polyhydroxy phenol.

Abstract: A tetrafluoroethylene-perfluoro(alkyl vinyl ether copolymer in which heat unstable carbinol end-groups (--CH.sub.2 OH groups) present have been protected against heat degradation by treating the copolymer with NH.sub.3 or NH.sub.3 producing compounds.

Abstract: Process for crosslinking fluorocarbon polymers, of ethylene and tetrafluoroethylene or chlorotrifluoroethylene, which contain esterified pendant polyfluorinated tertiary alcohol groups.

Abstract: Tough, stable copolymers of tetrafluoroethylene monomer and fluorovinyl ether monomers can be produced by polymerizing the monomers in perfluorinated or suitable non-perfluorinated hydrogen and chlorine containing fluorocarbon solvents by a process that requires that the reaction be carried out at from about 30.degree. to about 75.degree. C. in the presence of a low temperature initiator such as bis(perfluoro propionyl) peroxide and a hydrogen containing chain transfer agent such as methanol.