Abstract: A filler system for polymers is disclosed which provides high voltage insulation which is resistant to tracking. The filler system utilizes a combination of alumina trihydrate and a chemically treated silica filler. The silica-treated filler results from the exposure of an inorganic silicon-containing filler having a specific surface area of at least 40 square meters per gram to one or more silanes. Preferred silanes are substituted silanes having the formula R.sub.n Si X.sub.4.sub.-n where n is 1, 2 or 3, R is an organic radical bonded to the silicon atom by a Si--C bond and X is a radical bound to the silicon atom via an atom other than a carbon atom.

Abstract: A conjugate polycarbonate fiber comprising 95% to 50% by weight of a polycarbonate component and 5 to 50% by weight of a polypropylene component wherein ultrafine fibers composed of the polypropylene component are dispersed and arranged in a bundle-like form in the polycarbonate component as the fiber matrix, whereby the crazing resistance and oil resistance are improved. The conjugate polycarbonate fiber can be made into fibrous sheets and non-woven fabrics. The non-woven fabrics are adapted to be used as insulating layers in electric power cables.

Abstract: An electric cable comprising a reinforcing member including a roving of strands of reinforcing elongated fibers and synthetic resin having the weight of 15 to 50 percent as against that of the strands and bonding the strands of the roving. The reinforcing member may be in the form of an armoring member, a tensioning member and an insulation.

Abstract: In combination in an electric cable, at least one conductor, an essentially smokeless insulating jacket enclosing said conductor, the jacket consisting essentially of a chlorosulfonated polyethylene having uniformly dispersed therethrough an amount of magnesium oxide at least sufficient to suppress substantial cable jacket smoking when the cable is subjected to pyrolysis.

Abstract: An insulating coating composition is described which prevents deterioration of the insulating ability of newly fabricated material and when applied will also restore insulation characteristics to material presently in use. The composition comprises a mixture of1. a main resinous coating of a thermoplastic resin;2. a cation exchange resin which may be either strongly acidic, i.e., one containing sulfur type, sulphonic acid radicals or weakly acidic, i.e., one containing carboxyl groups or phenolic hydroxyl groups; and3. an anion exchange resin which may be either strongly basic, i.e., one containing quaternary ammonium radicals or weakly basic, i.e., one containing amine radicalsA method of arresting or preventing deterioration of insulating coatings is also disclosed by the use of the above materials which when applied will remove disassociated ions which, in turn, prevent formation of an electroconductive film on the surface of the coating.

Abstract: A method of compounding thermoplastic polymeric material and fillers, including additives and agents, and unique compounded products. The compounding method comprises mixing the thermoplastic polymeric material in particulate form with particulate filler, and in progressive sequence melting the surface portion of the thermoplastic particles, blending the filler with said molten surface portion of the thermoplastic particles and removing the resultant blended melt and filler from the surface of the thermoplastic particles. The mixing and melting, and the blending and removing, are continued until the filler is substantially assimilated into the polymeric material and the thermoplastic particles become substantially diminished by melting and blending, or the method can be carried further if desired. The compounded product thus prepared is characterized by a distinctive stratified consistency.

Abstract: New polymeric materials containing sulphone groups in the polymer chain are particularly suitable for moulding to give strong transparent products of high softening point and may be used as electrical insulants in condensers.

Abstract: A weather-resistant high-voltage electrical insulator appliance, or at least a portion thereof which is exposed to the atmosphere, is formed of a solvent-free aliphatic polyurethane which is at least substantially free of aromatic groups.

Abstract: An electrically insulating powdery material with a volume resistivity of at least 1 .times. 10.sup.10 ohms-cm, which consists of a calcined product of a mixture of magnesium oxide with boron oxide and if desired, at least one of titanium, iron and chromium oxides and has a special novel structure wherein a core of magnesium oxide particles is surrounded by a sheath of a double oxide of the magnesium oxide and the boron oxide and if desired, the other metal oxide. This insulating powdery material is produced by calcining the above mixture under specified calcining conditions determined by a special temperature-time relation. A thermally conducting and electrically insulating resin composition especially having superior electrical properties under high temperature-high humidity conditions can be prepared using the above powdery material as a filler.

Abstract: An elongated wrapper which is initially flexible and which, when wrapped around one or more bodies, is adapted to be stretched and assume a substantially rigid condition. The wrapper has an outer, elongated, tubular, elastic envelope assembly which is of a generally flat cross section and which is adapted to surround one or more bodies while being longitudinally stretched and wrapped around the bodies. This envelope assembly has an inner surface carrying one of a pair of materials which, when they combine, react to assume a hardened condition. The other of these materials is situated in the interior of the envelope assembly and is separated from the one of the pair of materials by a separating layer structure which is located in the envelope assembly between the pair of materials separating them from each other to prevent them from combining.

Abstract: An insulation material which comprises:A. a major amount of 1,2-polybutadiene;B. from 10 to 150 parts by weight of a styrene or styrene derivative per 100 parts by weight of 1,2-polybutadiene;C. from 15 to 150 parts by weight of 2,4,6-tribromophenylacrylate per 100 parts by weight of the mixture of 1,2-polybutadiene and styrene or styrene derivative; andD. from 100 to 300 parts by weight of talc powder per 100 parts by weight of 2,4,6-tribromophenyl acrylate.