Abstract: A multi-component polymer rubber comprising (A) 15 to 60 mole % of an .alpha.,.beta.-unsaturated nitrile, (B) 10 to 75 mole % of a conjugated diene, and (C) 2 to 55 mole % of a fluoroalkyl acrylate or methacrylate or a fluorine-containing .alpha.-olefin, and having a glass transition temperature (T.sub.g) of -50.degree. C. to -20.degree. C., the percentages of the components (A), (B) and (C) being based on the total sum of moles of the components (A), (B) and (C). Said multi-component polymer rubber is excellent in sour gasoline resistance and alcohol-containing gasoline resistance.

Abstract: Quaterpolymers are described which are composed of the following copolymerized monomer units (in mole %):(a) 55 to 30% of tetrafluoroethylene, (b) 60 to 40% of ethylene, (c) 10 to 1.5% of hexafluoropropylene and (d) 2.5 to 0.05% of a vinyl monomer which has "bulky" side chains and which can be, for example, a perfluorinated olefin, a perfluorinated vinyl ether, a perfluoroalkyl-substituted vinyl compound, a vinyl or allyl ether or an allyl or vinyl ester. The tensile strength and, in particular, the elongation at break at elevated temperatures is improved by the incorporation of both hexafluoropropylene and "bulky" vinyl monomers. The quaterpolymers are suitable for the manufacture of extruded articles, monofilaments and wire-coatings.

Abstract: A continuous process for polymerizing tetrafluoroethylene alone or with selected comonomers to prepare a polymer which employs a perfluoroalkyl ethane sulfonic acid or its salt or a perfluoroalkyl ethane sulfate salt as dispersing agent.

Abstract: In the batch process for copolymerizing tetrafluoroethylene and selected comonomers to prepare a copolymer thereof, the improvement which comprises employing a perfluoroalkylethane sulfonic acid or its salts as the dispersing agent.

Abstract: A novel fluorine-containing compound of the formulaR.sub.1 --A--R.sub.2whereinA is ##STR1## R.sub.1 and R.sub.2 are each hydrogen or R.sub.3 OOC--CH.sub.2).sub.n, while R.sub.1 and R.sub.2 may not be hydrogen at the same time; X is hydrogen or halogen; R.sub.3 is hydrogen or a lower alkyl group; m is an integer of 1 to 5; and n is an integer of 4 to 11, and a process for preparing the same.

Abstract: This invention relates to substrates and articles of manufacture incorporating a fluoropolymer primer coating. The primer coating comprises a copolymer of ethylene and a halogenated comonomer selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene and mixtures thereof and 0 to 10 mol percent of an additional monomer selected from the group consisting of 3,3,3-trifluoro-2-trifluoromethyl propene, a vinyl monomer which is free of telogenic activity and which provides a side chain having at least two carbon atoms, said side chain being aromatic or having its elements bonded together by a single bond only, or mixtures thereof, and containing from about 5 to 60 percent by weight of the total composition of an epoxy resin and from about 1 to 25 percent by weight of the total composition of an oxide of cobalt, nickel, manganese, tungsten or mixtures thereof.

Abstract: Compositions which when coated onto wire as insulation have good resistance to deterioration under low voltage AC stress in hot water are provided which comprise a melt-processible copolymer consisting essentially of units of tetrafluoroethylene and at least one comonomer that is a selected ethylenically unsaturated fluorinated monomer, and an organo-polysiloxane that is substantially stable and nonvolatile at the temperature of melt-processing for the copolymer used, is substantially incompatible with the copolymer, and is dispersed in the copolymer. The compositions are prepared by employing techniques which provide sufficient transporting pressure to transport the components into a mixing zone, and which provide shearing action sufficient to cause the organopolysiloxane to disperse.

Abstract: Copolymers of tetrafluoroethylene and ethylene essentially consist of components of from 40 to 60 mole % of tetrafluoroethylene, 40 to 60 mole % of ethylene and 0.1 to 10 mole % of perfluoroalkyl vinyl component having the formulaCH.sub.2 .dbd. CH--C.sub.n F.sub.2n + 1wherein n is an integer of 2 to 10. Said copolymer has a volumetric flow rate of 10 to 500 mm.sup.3 /sec. defined in the specification.The copolymers of tetrafluoroethylene and ethylene are produced by copolymerizing tetrafluoroethylene and ethylene with a molar ratio of C.sub.2 F.sub.4 /C.sub.2 H.sub.4 being kept essentially higher than 40/60 in the reactor in the presence of a small amount of a perfluoroalkyl vinyl monomer having the formulaCH.sub.2 .dbd. CH--C.sub.n F.sub.2 + 1wherein n is an integer of 2 to 10.This is a continuation of application Ser. No. 689.526, filed May 24, 1976, now abandoned.

Abstract: A high molecular weight vinylidene fluoride polymer resin having improved melt flow properties and further characterized as having a bimodal molecular weight distribution, as measured by gel permeation chromatography, and a specified critical shear stress.

Abstract: A tetrafluoroethylene polymer comprising primary particles having core and shell portions, the core portion comprising tetrafluoroethylene polymerized in the presence of a perfluoroalkyl or alkoxy trifluoroethylene comonomer, particularly hexafluoropropylene, and shell portion consisting of tetrafluoroethylene homopolymer, or a copolymer of tetrafluoroethylene in which the comonomer concentration is less than half that in the core portion.

Abstract: Stress-crack resistant terpolymers of from about 40 to 60 mol percent ethylene, about 60 to 40 mol percent of a halogenated comonomer selected from the group consisting of tetrafluoroetylene, chlorotrifluoroethylene and mixtures thereof and about 0.1 to 10 mol percent of a termonomer selected from the group consisting of 3,3,3-trifluoro-2-trifluoromethyl propene, a vinyl monomer which is free of telogenic activity and which provides a side chain having at least two carbon atoms, the side chain being aromatic or having its elements bonded by a single bond only, and mixtures thereof, and containing high and low molecular weight components such that: ##EQU1## WHEREIN X.sub.i represents the weight fraction of each high molecular weight component i;Mw represents the weight-average molecular weight of the terpolymer,Mw.sub.i represents the weight-average molecular weight of each component i, ##EQU2## WHEREIN X.sub.j represents the weight fraction of each low molecular weight component j;Mw.sub.

Abstract: A process for preparing new elastomeric copolymers of vinylidene fluoride having exceptionally valuable properties is disclosed. Monomeric mixtures containing vinylidene fluoride in such quantities as to yield elastomeric products are polymerized in solution, emulsion or suspension, or in the absence of solvents and/or dispersants (mass or bulk) in the presence of radical polymerization initiators, at temperatures of -30.degree. C to =200.degree. C, preferably at 0.degree. C to 120.degree. C, and at a pressure of from autonomous pressure to 300 atmospheres. In this process, vinylidene fluoride is fed into the reaction mixture during the polymerization and in a quantity such that the ratio between the added vinylidene fluoride and the vinylidene fluoride of the monomeric mixture subjected to polymerization varies between 0.1 and 1.5.

Abstract: Polymers and copolymers of ##STR1## are disclosed, wherein X and X.sup.1 are halogen.

Abstract: Sintered micro-powder of tetrafluoroethylene polymer having an average particle size of 100 microns or less, a sphere factor of 1.2 or less, a specific gravity of 2.20 or less, and a weight loss on heating of 0.5 percent or less. The process for the preparation thereof comprising atomizing an aqueous dispersion containing 5 to 80 percent by weight of tetrafluoroethylene polymer particles having 0.05 to 0.5 micron average particle size into a gas at a temperature above the melting point of the tetrafluoroethylene polymer and recovering the sintered micro-powder.