Abstract: Compositions comprising a fluoropolymer derived from a nitrogen-containing cure site monomer, a catalyst composition which comprises at least one anionic functional group and at least one cationic functional group having the formula QR′k(+), wherein Q is selected from phosphorous, sulfur, nitrogen, arsenic, or antimony, wherein each R′ is independently selected from hydrogen and a nonfluorinated, partially fluorinated, or perfluorinated, C1-C20 alkyl, aryl, aralkyl, or alkenyl group, and wherein k is the valence of Q plus one; wherein the catalyst composition is a compound or the precursors thereof added separately or as a mixture; and a composition of the formula: R″2SOx wherein each R″ is C1-C30 alkyl, aralkyl, the two R″ groups together form a heterocyclic C3-C30 cycloalkyl, aryl, or aralkyl, each R″ can be fluorinated, and x is 1 or 2. Also provided are methods of making a fluoropolymer and fluoropolymer articles containing fluoropolymer compositions.

Abstract: A curable fluoroelastomer composition for preparing a perfluoroelastomer. The composition includes; (1) a perfluoropolymer having one or more cure-sites selected from a halogen capable of participating in peroxide cure reaction and/or nitrile groups; (2) an organic peroxide and/or a compound capable of effecting curing of the perfluoropolymer through said nitrile groups; and (3) optionally a polyunsaturated coagent. The perfluoropolymer in the composition is essentially free of ionic end groups and the total amount of metal cations in the composition is not more than 10&mgr;g/g perfluoropolymer. The perfluoroelastomers may be obtained from curing the composition in a sufficiently low amount of metal cations so as to make the fluoroelastomer suitable for use in the semi-conductor industry.

Abstract: A composition that includes a fluoropolymer comprising interpolymerized units derived from a cure site monomer comprising a nitrile group; and (b) a catalyst composition comprising a compound having the formula R1C(OR2)═NH, and salts thereof, where R1 and R2, independently, are a substituted or unsubstituted alkyl, aryl, aralkyl, or alkenyl group, as well as a method for curing this composition and cured articles prepared from this composition.

Abstract: A composition that includes: (a) a fluoropolymer comprising interpolymerized units derived from a cure site monomer comprising a nitrile group; and (b) a catalyst composition comprising a divalent metal amine complex compound having the formula:  where M is a divalent metal, X is an anionic group, and n is 2 to 6, as well as a method for curing this composition and cured articles prepared from this composition.

Abstract: The present invention provides a curable fluoroelastomer composition comprising: (a) a fluoroelastomer comprising a cure site component having a halogen capable of participation in a peroxide cure reaction; (b) an organic peroxide; and (c) a siloxane or silazane comprising one or more —SiH groups. The curable fluoroelastomer compositions generally show improved processing and the resulting cured fluoroelastomers generally have improved mechanical and physical properties.

Abstract: Curable fluoroelastomer compositions having improved compression set after curing are provided, as well as compositions that are of relatively high purity. These compositions include a hydrogen-containing fluoroelastomer having interpolymerized units derived from a cure-site monomer, a curative (optionally with a co-agent), and an organo-onium. When the fluoroelastomer contains units derived from vinylidene fluoride, the composition is essentially free from an inorganic acid acceptor. Methods of improving the compression of cured fluoroelastomer and cured fluoroelastomers having improved compression set are also provided.

Abstract: A method for enhancing the bond strength between a VDF-containing fluoroplastic layer and an elastomer layer of a multi-layer article. A VDF-containing fluoroplastic composition is applied to the surface of a precursor article that includes a curable elastomer layer to form a fluoroplastic layer. Prior to application of the fluoroplastic composition, the curable elastomer layer is thermally insulated to prevent it from undergoing substantial heating. Following application, the fluoroplastic layer is heated and the curable elastomer layer is cured (e.g., thermally cured). Preferably, the elastomer cure occurs separately from and subsequent to heating the fluoroplastic layer. The combination of thermally insulating the curable elastomer layer prior to application of the fluoroplastic composition and heating the fluoroplastic layer following application of the fluoroplastic composition results in formation of a strong bond between the fluoroplastic and elastomer layers upon cure.

Abstract: A composition and method for making a fluoroelastomer is disclosed. The composition comprises a fluoroelastomer containing chlorine and an organic compound containing at least an hydride function. The hydride function has the formula MH where M is Si, Ge, Sn or Pb.

Abstract: In one aspect, the invention provides curable fluoropolymer compositions comprising fluoropolymer, onium, and alkyl or aryl oxalate-blocked compound and carbonate-blocked compound as crosslinking agents. In other aspects, the invention provides methods of making curable fluoropolymer compositions and provides alkyl or aryl oxalate-blocked and carbonate-blocked compounds.

Abstract: In one aspect, the invention provides curable fluoropolymer compositions comprising fluoropolymer, onium, and alkyl or aryl oxalate-blocked compound as a crosslinking agent. In other aspects, the invention provides methods of making curable fluoropolymer compositions and provides alkyl or aryl oxalate-blocked compounds.

Abstract: A composition of a fluoropolymer comprising interpolymerized units of nitrogen-containing cure site monomer and a catalyst comprising a compound having the formula: 1

Abstract: A composition comprising (a) a fluoropolymer having pendant imidate groups, which imidate groups have the formula: —C═NH(OR) wherein R is a C1-C10 aliphatic group which aliphatic group may have F or Cl substituents; and optionally, (b) a perfluorovinyl ether of the general formula: CF2═CFO(R′fO)a(R″fO)bRf wherein R′f and R″f are the same or are different C1-C6 linear or branched perfluoroalkylene groups; a and b are, independently, 0 or an integer from 1 to 10; and Rf is a C1-C8 perfluoroalkyl group or a C1-C15 perfluoroalkoxy group.

Abstract: A composition of (a) a fluoropolymer having interpolymerized units derived from a nitrogen-containing cure site monomer; and (b) a nonfluorinated catalyst composition that includes a compound having the general formula: {RA}(−){QR′k}(+) or in certain cases the precursors thereof, wherein R is hydrogen, an alkyl, alkenyl, cycloalkyl, cycloalkenyl, aryl or aralkyl, A is an acid- or acid-derivative anion, Q is phosphorous, sulfur, nitrogen, arsenic, or antimony, and each R′ is hydrogen or an alkyl, aryl, aralkyl, or alkenyl group, k is the valence of Q; and optionally (c) an alcohol of the formula R2—OH, wherein R2 is an alkyl group which can be partially fluorinated.

Abstract: A method for increasing the adhesion of a first layer comprising a fluoropolymer substantially free of interpolymerized units derived from vinylidene fluoride to a second layer comprising a curable elastomer is described. The method comprises adding a dehydrofluorinating composition to the curable elastomer, contacting the layers and curing the layered article so formed. The resulting multilayer compositions and articles are also disclosed.

Abstract: A fluoroelastomer composition having improved compression set. The fluoroelastomer composition comprises: (1) a fluoroelastomer containing interpolymerized units of at least one perfluoroolefin, at least one perfluorovinyl ether, and a cure site component capable of participation in a peroxide cure reaction; (2) an additive selected from the group consisting of organo-oniums, phosphates, phosphine oxides, amine oxides, alkyl amines, and heterocyclic amines and salts of heterocyclic amines; (3) a peroxide curative, and (4) optionally a coagent.

Abstract: Compositions comprising a fluoropolymer having interpolymerized units derived from a nitrogen-containing cure site monomer and a catalyst composition are provided.

Abstract: The present invention provides a curable fluoroelastomer composition comprising:

Abstract: In one aspect, the invention provides curable fluoropolymer compositions comprising fluoropolymer, onium, and alkyl or aryl oxalate-blocked compound and carbonate-blocked compound as crosslinking agents. In other aspects, the invention provides methods of making curable fluoropolymer compositions and provides alkyl or aryl oxalate-blocked and carbonate-blocked compounds.

Abstract: In one aspect, the invention provides curable fluoropolymer compositions comprising fluoropolymer, onium, and alkyl or aryl oxalate-blocked compound as a crosslinking agent. In other aspects, the invention provides methods of making curable fluoropolymer compositions and provides alkyl or aryl oxalate-blocked compounds.

Abstract: A composition that includes a fluoropolymer comprising interpolymerized units derived from a cure site monomer comprising a nitrile group; and (b) a catalyst composition comprising a compound having the formula R1C(OR2)═NH, and salts thereof, where R1 and R2, independently, are a substituted or unsubstituted alkyl, aryl, aralkyl, or alkenyl group, as well as a method for curing this composition and cured articles prepared from this composition.