Abstract: An optical waveguide having a core-sheath structure whose core comprises a terpolymer based on vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene, is suitable for transmission paths of ca. 10 to ca. 100 m and can also be used at a temperature of above 100.degree. C. without significant reduction of the transmission path.

Abstract: An optical waveguide having a core/sheath structure whose sheath comprises a polymer which is based on vinylidene fluoride and at least one other vinyl monomer containing fluorine and has been modified and crosslinked with a trisalkoxyvinylsilane, is suitable for transmission paths of ca. 10 to 100 m and can also be used at a temperature above 100.degree. C. without any significant reduction in the transmission path.

Abstract: An optical waveguide having a core/sheath structure whose sheath comprises a terpolymer based on vinylidene fluoride, tetrafluoroethylene and hexafluorpropylene, is suitable for transmission paths of ca. 10 to 100 m and can also be used at a temperature of above 100.degree. C. without significant reduction of the transmission path.

Abstract: Fiber optics having a liquid core, which comprises a liquid of high radiation transmission, and a sheath made from a copolymer of vinylidene fluoride which comprises at least 20% by weight and at most 75% by weight of copolymerized units of vinylidene fluoride, and copolymerized units with at least one further fluorine-containing monomer are described. Suitable further monomers are, in particular, hexafluoropropylene, or hexafluoropropylene and tetrafluoroethylene. The fiber optic can, if appropriate, be provided with pigments or other coloring additives. The sheath made from the copolymer of vinylidene fluoride has excellent adhesion to other materials and can therefore easily be bonded to other materials.

Abstract: Composite material composed of(a) a plasticized PVC substrate, if appropriate a fabric coated with plasticized PVC, and(b) a top layer composed of(b.sup.1) 5 to 100% by weight of a mixture of an acrylic resin and plasticized PVC, and(b.sup.2) 0 to 95% by weight of a fluorine-containing copolymer formed from vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene and, if appropriate, a further fluoroolefin or fluoroalkyl vinyl ether,wherein, if the content of (b.sup.1) in (b) is 0 to 15% by weight, a sealing layer composed of the fluorine-containing copolymer (b.sup.2) is also applied to the top layer. The composite material is particularly suitable for structural units belonging to the field of textile construction.

Abstract: Fluoropolymer dispersions containing colloidal particles of a partially modified tetrafluoroethylene polymer, the fluoropolymer resin powder obtained therefrom by coagulation and a process for the preparation of the dispersions mentioned are described. The particles have a three-shell particle structure, the particle core and the other particle shell consisting of a tetrafluoroethylene polymer provided with a modifying fluoro-olefinic comonomer and the inner particle shell consisting of tetrafluoroethylene homopolymer. Fluoro-olefins, perfluoro-olefins, halogenofluoro-olefins and completely or partially fluorinated vinyl ethers are used as the modifying comonomers.The preparation is effected by the seed technique or intermediate letting down method, the modified core being formed in the first phase and the modifying comonomer being subsequently metered into the continuing tetrafluoroethylene polymerization in the second phase.

Abstract: Polymers on the basis of tetrafluoroethylene are produced in the presence of a redox system as catalyst consisting of a usual peroxidic compound as oxidizing component and a water-soluble nitrogen compound liberating in situ a diimine under the polymerization conditions. The polymers obtained can be processed, inter alia, into thick walled articles on a ram extruder or into large sintered block free from crack formation.

Abstract: Polymers of tetrafluoroethylene are produced by suspension polymerization in the presence of small amounts of definite perfluorinated ethers. The products obtained have improved processing properties.

Abstract: Polymers of tetrafluoroethylene are produced by suspension polymerization in the presence of small amounts of definite perfluorinated ethers. The products obtained have improved processing properties.

Abstract: Fluorocarbon wax dispersions are produced by telomerization of tetrafluoro-ethylene or mixtures of tetrafluoro-ethylene with other olefinic monomers. The stable wax dispersions and the pulverulent fluorocarbon waxes obtained are, inter alia, valuable additives for lubricants and polishes.

Abstract: Shaped structures containing polytetrafluoroethylene are connected with themselves or with another material stable up to 400.degree.C under elevated pressure and temperature using as interlayer between the surfaces to be connected at least one copolymer of tetrafluoroethylene and perfluoroalkyl-perfluorovinyl units in a determined proportion. The composites obtained have a high mechanic strength and the joint has good temperature endurance properties.

Abstract: An optical waveguide having a core/sheath structure whose sheath comprises a terpolymer based on vinylidene fluoride, tetrafluoroethylene and hexafluorpropylene, is suitable for transmission paths of ca. 10 to 100 m an can also be used at a temperature of above 100.degree. C. without significant reduction of the transmission path.