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: 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: 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: 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 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: A composition includes an amorphous fluoropolymer having at least one of: a segment represented by formula I: —CF(Rf)—(CX2)n—(CX2CXR)m—O—R?fOk—(CXR?CX2)p—(CX2)q—CF(R?f)— (I); or a terminal segment represented by formula III: Rf—CF(I)—(CX2)n—(CX2CXR)m—O—R?fOk—(CXR?CX2)p—(CX2)q—CF(R?f)— (III), and fluoroplastic particles having a mean particle size of less than 500 nanometers. Each X is independently F, H, or Cl; Rf and R?f are each independently F or a monovalent perfluoroalkyl having 1 to 3 carbon atoms; R is F or a partially fluorinated or perfluorinated alkyl having 1 to 3 carbon atoms; R?f is a divalent fluoroalkylene having 1 to 8 carbon atoms or a divalent fluorinated alkylene ether having 1 to 20 carbon atoms and at least one ether linkage; k is 0 or 1; and n, m, p, and q are each independently an integer from 0 to 5, with the proviso that when k is 0, n+m is at least 1 and p+q is at least 1. A method of making the composition is also provided.

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 a composition comprising (i) a hydrofluorothermoplastic polymer, wherein the hydrofluorothermoplastic polymer is derived from: (a) 50-85 mol % tetrafluoroethene; (b) 2-15 mol % hexafluoropropene; (c) 10-35 mol % vinylidene fluoride; and (d) 0.1 to 5 mol % of a bromine-containing monomer; and (ii) a perhalogenated thermoplastic polymer. Such compositions can be used in multilayer constructions in, for example, fuel hose applications.

Abstract: A composition includes an amorphous fluoropolymer having at least one of: a segment represented by formula I: —CF(Rf)—(CX2)n—(CX2CXR)m—O—R?fOk—(CXR?CX2)p—(CX2)q—CF(R?f)— (I); or a terminal segment represented by formula III: Rf—CF(I)—(CX2)n—(CX2CXR)m—O—R?fOk—(CXR?CX2)p—(CX2)q—CF(R?f)— (III), and fluoroplastic particles having a mean particle size of less than 500 nanometers. Each X is independently F, H, or Cl; Rf and R?f are each independently F or a monovalent perfluoroalkyl having 1 to 3 carbon atoms; R is F or a partially fluorinated or perfluorinated alkyl having 1 to 3 carbon atoms; R?f is a divalent fluoroalkylene having 1 to 8 carbon atoms or a divalent fluorinated alkylene ether having 1 to 20 carbon atoms and at least one ether linkage; k is 0 or 1; and n, m, p, and q are each independently an integer from 0 to 5, with the proviso that when k is 0, n+m is at least 1 and p+q is at least 1. A method of making the composition is also provided.

Abstract: Described herein is a composition comprising a fluorothermoplastic polymer, wherein the fluorothermoplastic polymer is derived from: (a) 60-85 mol % tetrafluoroethene; (b) 2-12 mol % hexafluoropropene; (c) 10-30 mol % vinylidene fluoride; (d) 0.2 to 5 mol % of a bromine-containing monomer. Such compositions can be used in multilayer constructions in, for example, fuel hose applications.

Abstract: Described herein is a composition comprising a fluorothermoplastic polymer, wherein the fluorothermoplastic polymer is derived from: (a) 60-85 mol % tetrafluoroethene; (b) 2-12 mol % hexafluoropropene; (c) 10-30 mol % vinylidene fluoride; (d) 0.2 to 5 mol % of a bromine-containing monomer. Such compositions can be used in multilayer constructions in, for example, fuel hose applications.

Abstract: Described herein is a composition comprising (i) a hydrofluorothermoplastic polymer, wherein the hydrofluorothermoplastic polymer is derived from: (a) 50-85 mol % tetrafluoroethene; (b) 2-15 mol % hexafluoropropene; (c) 10-35 mol % vinylidene fluoride; and (d) 0.1 to 5 mol % of a bromine-containing monomer; and (ii) a perhalogenated thermoplastic polymer. Such compositions can be used in multilayer constructions in, for example, fuel hose applications.