Co-cured blends of fluoroelastomers of tetrafluoroethylene-propylene copolymer with cure site monomer and terpolymers of Vinylidene fluoride (VDF), Hexafluoropropylene (HFP) and Tetrafluoroethylene (TFE) with peroxide as initiator and coagent TAIC as crosslinker show improved curing performance, improved mechanical properties and improved compression set as well. The co-cured fluoroelastomers show improved chemical resistance to the solvent aging systems and better retention of mechanical properties after aging at high temperature in the solvents system.

An electric wire for an in-vehicle network cable, including a conductor and a covering that covers a periphery of the conductor. The electric wire has a diameter of 0.5 to 1.5 mm. The covering contains a fluororesin that is a tetrafluoroethylene/hexafluoropropylene/perfluoro(alkyl vinyl ether) copolymer. The fluororesin has a melt flow rate of 20 to 40 g/10 min measured at 372° C. under a 5-kg load, a relative permittivity of 2.2 or lower measured at 25° C. and 6 GHz, a melting point of 250° C. or higher, an MIT folding endurance of 2000 times or more, and a tensile elongation at 150° C. of 300% or higher. Also disclosed is an in-vehicle network cable including the electric wire and an in-vehicle network cable including a twisted pair of electric wires, at least one of which is the above-described electric wire for an in-vehicle network cable.

An electric wire for an in-vehicle network cable, including a conductor and a covering that covers a periphery of the conductor. The electric wire has a diameter of 0.5 to 1.5 mm. The covering contains a fluororesin that is a tetrafluoroethylene/hexafluoropropylene/perfluoro(alkyl vinyl ether) copolymer. The fluororesin has a melt flow rate of 20 to 40 g/10 min measured at 372° C. under a 5-kg load, a relative permittivity of 2.2 or lower measured at 25° C. and 6 GHz, a melting point of 250° C. or higher, an MIT folding endurance of 2000 times or more, and a tensile elongation at 150° C. of 300% or higher. Also disclosed is an in-vehicle network cable including the electric wire and an in-vehicle network cable including a twisted pair of electric wires, at least one of which is the above-described electric wire for an in-vehicle network cable.

Co-cured blends of fluoroelastomers of tetrafluoroethylene-propylene copolymer with cure site monomer and terpolymers of Vinylidene fluoride (VDF), Hexafluoropropylene (HFP) and Tetrafluoroethylene (TFE) with peroxide as initiator and coagent TAIC as crosslinker show improved curing performance, improved mechanical properties and improved compression set as well. The co-cured fluoroelastomers show improved chemical resistance to the solvent aging systems and better retention of mechanical properties after aging at high temperature in the solvents system.

Provided herein is a curable fluoroelastomer composition including at least one fluoroelastomer comprising copolymerized units of a nitrile group-containing cure site monomer; a cure system comprising at least two different dihydrazides; and optionally at least one additive. Further provided are pre-forms comprising the curable composition, methods of curing the fluoroelastomer composition, compositions that are the product of curing the curable fluoroelastomer composition, and articles comprising the cured fluoroelastomer composition.

Described herein is a latex blend comprising (i) an amorphous perfluoropolymer and (ii) an aqueous dispersion of semi crystalline fluoropolymer particles, wherein the particles comprise a TFE homopolymer or a TFE copolymer comprising no more than 1 wt % of a second fluorinated monomer, wherein the semi crystalline fluoropolymer particles (a) have an MFI (372° C. with 2.16 kg) of less than 50 g/10 min or (b) are not melt processible and have an SSG of less than 2.190, wherein the semi crystalline fluoropolymer particles have an average diameter greater than 100 nm.

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.

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.

A method for producing a fluoropolymer which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a fluorine-containing diacyl peroxide represented by the formula (1): XRf.sup.aC(═O)OOC(═O)Rf.sup.bY (wherein X and Y are each independently H or F; and Rf.sup.a and Rf.sup.b are each independently a C1-C6 linear or branched perfluoroalkylene group optionally containing an ether bond) and a fluorine-containing carboxylic acid represented by the following formula (2): Z.sup.2Rf.sup.cCOOH (wherein Z.sup.2 is H or F; and Rf.sup.c is a C1-C3 linear or branched perfluoroalkylene group optionally containing an ether bond when Z.sup.2 is H, and Rf.sup.c is a C1 or C2 linear or branched perfluoroalkylene group optionally containing an ether bond when Z.sup.2 is F) to provide a fluoropolymer.

A method for producing a fluoropolymer which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a fluorine-containing diacyl peroxide represented by the formula (1): XRf.sup.aC(═O)OOC(═O)Rf.sup.bY (wherein X and Y are each independently H or F; and Rf.sup.a and Rf.sup.b are each independently a C1-C6 linear or branched perfluoroalkylene group optionally containing an ether bond) and a fluorine-containing carboxylic acid represented by the following formula (2): Z.sup.2Rf.sup.cCOOH (wherein Z.sup.2 is H or F; and Rf.sup.c is a C1-C3 linear or branched perfluoroalkylene group optionally containing an ether bond when Z.sup.2 is H, and Rf.sup.c is a C1 or C2 linear or branched perfluoroalkylene group optionally containing an ether bond when Z.sup.2 is F) to provide a fluoropolymer.