Abstract: Copolymers having copolymerized units of vinylidene fluoride, perfluoro(alkyl vinyl) ether, 2-hydropentafluoropropene, and, optionally, tetrafluoroethylene, exhibit excellent low temperature properties and processability when cured with polyhydroxy compounds or amines.

Abstract: Disclosed herein is a novel class of fluorovinyl ether monomers which are useful as cure site monomers in fluoroelastomers, a process for the preparation of these fluorovinyl ether monomers, and fluoroelastomer copolymer compositions that contain copolymerized units of these fluorovinyl ether monomers.

Abstract: Copolymers having copolymerized units of vinylidene fluoride, perfluoro(alkyl vinyl) ether, 2-hydropentafluoropropene, and, optionally, tetrafluoroethylene, exhibit excellent low temperature properties and processability when cured with polyhydroxy compounds or amines.

Abstract: Curable fluoroelastomer compositions comprising a fluoroelastomer, a curative for the fluoroelastomer, and a molecular sieve additive exhibit a reduced tendency to sponge during the curing process.

Abstract: Perfluoroelastomer compositions comprising perfluoroelastomers having copolymerized units of tetrafluoroethylene, a perfluoro(vinyl ether), and a nitrile-containing cure site monomer are cured with compounds that are capable of generating ammonia at temperatures of 40° C.-330° C. to produce cured compositions having excellent thermal stability. The ammonia-generating compounds also act as cure accelerators in perfluoroelastomer compositions that incorporate other curing agents.

Abstract: Curable perfluoroelastomer compositions are disclosed that comprise ammonia and uncured perfluorinated elastomers having copolymerized units of nitrile-containing cure site monomers. Such compositions are curable at low temperatures. In addition, curable perfluoroelastomer compositions are disclosed wherein ammonia functions as a cure rate accelerator in the presence of other curing agents.

Abstract: Perfluoroelastomer compositions of improved processability are provided which have reduced levels of ionized or ionizable polymer endgroups.

Abstract: Perfluoroelastomer compositions are provided which have excellent high temperature properties. The perfluoroelastomer component of the compositions are copolymers having a plurality of carbonyl-containing functional groups and copolymerized monomer units comprising a perfluoroolefin, a perfluoro(vinyl) ether and a nitrile-containing cure site monomer. The curative component is other than an organotin compound and includes peroxides, ammonium salts, aromatic amino compounds, bisamidrazones, and bisamidoximes.

Abstract: Perfluoroelastomer compositions of improved processability are provided which have reduced levels of ionized or ionizable polymer endgroups.

Abstract: Curable perfluoroelastomer compositions are prepared in the presence of an initiator system comprising a mixture of a persulfate salt and a reducing agent wherein the amount of reducing agent present is no more than 20 mole percent of the total initiator system. The perfluoroelastomer is isolated and decarboxylated, thereby providing a product having excellent processability.

Abstract: Perfluoroelastomer compositions of improved processability are provided which have reduced levels of ionized or ionizable polymer endgroups.

Abstract: Curable perfluoroelastomer compositions are prepared in the presence of an initiator system comprising a mixture of a persulfate salt and a reducing agent wherein the amount of reducing agent present is no more than 20 mole percent of the total initiator system. The perfluoroelastomer is isolated and decarboxylated, thereby providing a product having excellent processability.

Abstract: Perfluoroelastomer compositions of improved processability are provided which have reduced levels of ionized or ionizable polymer endgroups.

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: A fluoroelastomer composition which has beneficial utility in the rapid manufacture of cured fluoroelastomer articles having good strength and resistance to compression set can be prepared by blending the following components: (A) an elastomeric copolymer of vinylidene fluoride and another fluorine-containing monomer, and (B) as a vulcanization agent, a carboxylic acid ester of 4,4'-sulfonylidiphenol (for example, 4,4'-sulfonyldiphenol diacetate); and when making the cured articles, it is also preferred to add (C) a suitable metal compound such as a divalent metal oxide or hydroxide, and (D) a suitable accelerator, for example a certain type of quaternary phosphonium compound.