Abstract: Iodoperfluoroalkylnitriles are useful as chain transfer agents in the free radical polymerization of vinyl monomers to form perfluoropolymers. These nitrites provide end groups, which may take part in a cross-linking reaction, if desired, and also have a relatively low toxicity. The resulting perfluoropolymers are useful as molding resins and elastomers, particularly for parts where good chemical resistance and/or high temperature resistance are desirable.

Abstract: This invention concerns a process for fluorinating a perfluoroelastomer which has previously been crosslinked by exposure to ionizing radiation. The resulting product has reduced outgassing. This makes perfluoroelastomer parts that have undergone the process particularly useful in clean rooms and for semiconductor manufacturing.

Abstract: A process for preparing perfluoroelastomer compositions which comprise perfluoroelastomers having a plurality of nitrile groups and a plurality of carboxyl-containing groups, carboxylate-containing groups, carboxamide groups, or mixtures thereof is provided. Such compositions cure rapidly in the presence of organotin compounds.

Abstract: Curable perfluoroelastomer compositions are provided which comprises a perfluoroelastomer, a curative, and an organic or inorganic ammonium salt which decomposes between 120.degree.-225.degree. C.

Abstract: An amorphous atactic alternating branched copolymer having a glass transition temperature less than about 0.degree. C., said copolymer having repeating units of --A--B-- wherein A is a polymerized unit derived from a compound containing the group ##STR1## and where B is a polymerized unit derived from a compound containing the group CH.sub.2 =C<.

Abstract: An amorphous substantially linear atactic alternating copolymer having a glass transition temperature less than about 0.degree.C., and an inherent viscosity of about 1 to about 6, said copolymer having repeating units of -A-B- wherein A is a unit of at least one C.sub.1 -C.sub.8 alkyl acrylate and cure-site monomer if the cure-site monomer is an acrylic, and B is independently selected from ethylene and cure-site monomers if the cure-site monomer is an .alpha.-olefin. These copolymers are prepared by reacting monomers in the presence of boron trifluoride and a free radical initiator and, when cured, are particularly useful as elastomers.