Abstract: Fluoroelastomers are disclosed that comprise copolymerized units of vinylidene fluoride and a vinyl ester of the formula CH2?CHOC(O)R, wherein R is a C1-C4 alkyl group. In one embodiment of the invention, the fluoroelastomers further comprise copolymerized units of a perfluoro(alkyl vinyl ether) and, optionally, tetrafluoroethylene. In another embodiment, the vinylidene fluoride/vinyl ester fluoroelastomers further comprise hexafluoropropylene. Optionally, fluoroelastomers of the invention contain copolymerized units of a cure site monomer.

Abstract: Fluoroelastomers are disclosed that comprise copolymerized units of a vinyl ester of the formula CH2?CHOC(O)R, wherein R is a C1-C4 alkyl group and at least one monomer selected from the group consisting of tetrafluoroethylene and a perfluoro(alkyl vinyl ether). The elastomers may further contain copolymerized units of a hydrocarbon olefin such as ethylene or propylene. Optionally, fluoroelastomers of the invention may contain copolymerized units of a cure site monomer or a cure site monomer. Pendant ester groups on the fluoroelastomer may be at least partially saponified.

Abstract: Disclosed herein are novel ?,?-dihydrofluorovinyl ethers, homopolymers thereof and copolymers containing more than 22 mole percent copolymerized units of said ether. The ethers have the general formula Rf—[CH2]n-OCF?CF2, wherein n is 1 or 2, and Rf is selected from the group consisting of a perfluoroalkyl group, a perfluoroalkoxy group, a fluoroalkyl group and a fluoroalkoxy group.

Abstract: Fluoroelastomers are disclosed which have a glass transition temperature less than ?10° C. The elastomers contain copolymerized units of a perfluorovinylpolyether that is derived from a trimer or tetramer of hexafluoropropylene oxide.

Abstract: Curable multimodal fluoroelastomer compositions contain a low viscosity fluoroelastomer component that imparts good extrusion performance and a high viscosity component that imparts good physical properties in cured articles. The fluoroelastomer comprises copolymerized units of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene. At least the low viscosity component also contains copolymerized units of a bromine- or iodine-containing cure site monomer such as 4-bromo-3,3, 4,4-tetrafluorobutene-1 or 4-iodo-3,3,4,4-tetrafluorobutene-1.