Abstract: The process includes providing an aqueous mixture including perfluorinated monomers, a fluoroalkyl sulfinic acid or salt thereof, and an oxidizing agent capable of oxidizing the fluoroalkyl sulfinic acid or salt thereof and polymerizing the perfluorinated Nmonomers under free radical conditions to provide an aqueous dispersion of the fluoropolymer. The fluoroalkyl group has from one to three carbon atoms. The amount of perfluorooctanoic acid or salt thereof in the aqueous dispersion of the fluoropolymer as polymerized is not more than 25 nanograms per gram of the fluoropolymer. A fluoropolymer made by the process is also described.

Abstract: Methods of making anti-sticking perfluorinated articles are described. The methods include molding curing, and heat-treating a composition prepared from a coagulated and dried blend of latex dispersions of a perfluoro-elastomeric gum and a perfluoroplastic. The curing steps are performed at temperatures below the melting point of the perfluoroplastic, while the heat-treatment step occurs at a temperature above this melting point. The resulting articles are also described.

Abstract: A curable composition comprising a fluorinated amorphous fluoropolymer, and a blend of polysulfonamide and polyol crosslinking agents.

Abstract: Provided is a curable composition comprising a partially fluorinated fluoropolymer, optionally an organo-onium accelerator an acid acceptor; and a crosslinking component of the formula.

Abstract: Described herein is curable composition comprising a partially halogenated elastomeric gum comprising a plurality of cure sites selected from at least one of iodine, bromine, and nitrile; a silicon-containing compound; a dehydrohalogenation agent; and a peroxide cure system. Upon curing, a silicon-containing superficial layer forms, which can provide good chemical stability, increased durability, non-tackiness, and a matte finish to the cured elastomer.

Abstract: The composition includes an amorphous fluoropolymer having at least one of bromo- or iodo-cure sites, benzoyl peroxide, and a crosslinker comprising more than one carbon-carbon double bond. Benzoyl peroxide is present in an amount of three to four parts per hundred parts of fluoropolymer in the composition, and the benzoyl peroxide is present in an amount greater than or equal to that of the crosslinker. An article made from the composition and a method of making a fluoroelastomer are also disclosed.

Abstract: Described herein are fluoropolymer compositions comprising a compound of Formula (I) wherein X1 is selected from O or S; L is a divalent linking group comprising at least one aromatic ring; O and X2 comprises a carbon-carbon double bond. In one embodiment, the phthalonitrile-containing compound is added to a composition comprising (i) a fluorinated elastomeric gum, wherein the fluorinated elastomeric gum comprises a fluoropolymer having a cure-site and (ii) a peroxide curing system.

Abstract: Described herein are fluoropolymer compositions comprising a compound of Formula I wherein X1 is selected from O or S; L is a divalent linking group comprising at least one aromatic ring; and X2 is selected from the group consisting of a hydroxyl group, an amino group, a thiol group, and a nitrile group. In one embodiment, the phthalonitrile-containing compound is used to crosslink a dehydrohalogenated polymer, and optionally with a polyhydroxy curative. In another embodiment, the phthalonitrile-containing compound is added to a composition comprising (i) a fluorinated elastomeric gum, wherein the fluorinated elastomeric gum comprises a fluoropolymer having a cure-site and (ii) a peroxide curing system.

Abstract: Described herein is a curable fluoropolymer composition comprising: an amorphous fluoropolymer; and particles of a metal fluoride, wherein the particles are not substantially surface treated and wherein the metal of the metal fluoride comprises at least one of an alkaline earth metal, a Group III transition metals, and a Lanthanide metals. Also described are cured articles made with the curable fluoropolymer composition.

Abstract: Described herein are fluoropolymer compositions comprising a compound of Formula (I) wherein X1 is selected from O or S; L is a divalent linking group comprising at least one aromatic ring; O and X2 comprises a carbon-carbon double bond. In one embodiment, the phthalonitrile-containing compound is added to a composition comprising (i) a fluorinated elastomeric gum, wherein the fluorinated elastomeric gum comprises a fluoropolymer having a cure-site and (ii) a peroxide curing system.

Abstract: Described herein are compounds according to Formula (I) wherein Rf is a perfluorinated divalent group comprising 2 to 12 carbon atoms; and Z is selected from —CH?CH2, and —CH2CH?CH. A method of making the compound from a functionalized vinyl ether and ammonia is disclosed. In one embodiment, the functionalized triazine-containing compound is used in the polymerization of a fluoropolymer. In another embodiment, the functionalized triazine-containing compound is used in a curable fluoropolymer composition and cured to form articles.

Abstract: Described herein are compounds according to Formula (I) wherein each Rf is independently selected from a perfluorinated divalent group comprising 2 to 12 carbon atoms; and m is an integer independently selected from 1 to 3. A method of making the compound from a hydroxy-containing vinyl ether and excess ammonia is disclosed. In one embodiment, the hydroxy-functionalized triazine compound is used in a curable fluoropolymer composition and cured to form articles.

Abstract: Described herein are fluoropolymer compositions comprising a compound of Formula I wherein X1 is selected from O or S; L is a divalent linking group comprising at least one aromatic ring; and X2 is selected from the group consisting of a hydroxyl group, an amino group, a thiol group, and a nitrile group. In one embodiment, the phthalonitrile-containing compound is used to crosslink a dehydrohalogenated polymer, and optionally with a polyhydroxy curative. In another embodiment, the phthalonitrile-containing compound is added to a composition comprising (i) a fluorinated elastomeric gum, wherein the fluorinated elastomeric gum comprises a fluoropolymer having a cure-site and (ii) a peroxide curing system.

Abstract: Described herein is curable composition comprising a halogenated amorphous polymer having at least 25% halogen by weight; at least 0.5 phr of an acid acceptor; at least 0.01 phr of silicon-containing compound; and a dehydrohalogenation cure system. Upon curing, a silicon-containing superficial layer forms, which can provide increased durability, non-tackiness, and a matte finish to the cured elastomer.

Abstract: Described herein is method of making branched perfluorinated compounds, specifically (CF3)2CFCF(CF3)OCF(CF3)C(?O)F and (CF3)2CFCF(CF3)OCF?CF2. Also disclosed herein is a fluoropolymer derived from the branched perfluorovinyl ether monomer and methods of making the fluoropolymer.

Abstract: The composition includes a curable fluoropolymer having nitrogen-containing cure sites and a curative including an organo onium cation and an anion represented by Formula (I) or Formula (II). The composition is free of metal cations or has not more than 20 parts per million metal cations and free of silicon dioxide or has less than 0.5 percent by weight silicon dioxide, based on the total weight of the composition. In some cases, the composition consists of the curable fluoropolymer and the curative. Shaped articles including the composition, a fluoroelastomer prepared by curing the composition, a method of making a fluoroelastomer article, and a process for making the composition are also described.

Abstract: There is provided a curable composition comprising a fluorinated block copolymer having (a) at least one A block, wherein the A block is a semi-crystalline segment comprising repeating divalent monomeric units derived from at least a fluorinated monomer; and (b) at least one B block, wherein the B block is a segment comprising repeating divalent monomeric units that comprises at least a fluorinated monomer and a nitrile-containing cure-site monomer.

Abstract: Described herein is a millable fluorinated block copolymer having (a) at least one A block, wherein the A block is a semi-crystalline segment comprising repeating divalent monomeric units derived from at least TFE, HFP and VDF; (b) at least one B block, wherein the B block is a segment comprising repeating divalent monomeric units derived from at least HFP and VDF; and (c) a bisolefin monomer, wherein at least (i) the semi-crystalline segment of the A block comprises repeating divalent monomeric units derived from TFE, HFP, VDF, and the bisolefin monomer, (ii) the segment of the B block comprises repeating divalent monomeric units derived from HFP, VDF, and the bisolefin monomer, or (iii) a combination thereof; and wherein the millable fluorinated block copolymer has a modulus of 0.1 to 2.5 MPa at 100° C.

Abstract: Described herein is a method of making a curable perfluoroelastomer, wherein the curable perfluoroelastomer comprises particles of a semi crystalline fluoropolymer, wherein the semi crystalline fluoropolymer is a TFE copolymer comprising no more than 1 wt % of at least one additional fluorinated monomer. The method comprises: (a) obtaining an amorphous perfluoropolymer and the particles of the semi crystalline fluoropolymer; and (c) dry blending the amorphous perfluoropolymer and the particles to form a curable perfluoroelastomer.

Abstract: Described herein is a curable composition comprising an amorphous fluoropolymer having an iodine, bromine and/or nitrile cure site; a peroxide cure system comprising a peroxide and a Type II coagent; and a photoinitiator, wherein the curable composition is substantially free of a binder material. Also described herein, are methods of curing the curable composition using actinic radiation and articles thereof.