Compositions Patents (Class 174/23C)
  • Patent number: 4104480
    Abstract: This invention is an improved filling compound for preventing moisture penetration along the interior of high voltage electric power cables. Amorphous polypropylene, mixed with carbon where it must be semiconductive, is an extremely good filling compound because of its electrical characteristics and also because of its good flow characteristics when extruding. When the cable is to be used under conditions where it must withstand temperatures so low that the polypropylene becomes brittle, it can be blended with polyisobutylene rubber to withstand lower temperatures, but the blend must be kept within limits to prevent loss of the good flow characteristics of the amorphous polypropylene.
    Type: Grant
    Filed: November 5, 1976
    Date of Patent: August 1, 1978
    Assignee: General Cable Corporation
    Inventor: Paul F. Thompson
  • Patent number: 4095039
    Abstract: Filling compounds for high voltage, electric power transmission cables have been deficient in one characteristic or another, such as incompletely filling voids during manufacture, forming voids when cables are in service, lack of permanent adhesion to cable components to prevent passage of water lengthwise of the cable, and low drip point when cables are at elevated temperatures. This invention is a cable filled with a compound of isobutylene rubber that obtains all of the desirable filler characteristics for a high voltage power transmission cable.
    Type: Grant
    Filed: April 16, 1976
    Date of Patent: June 13, 1978
    Assignee: General Cable Corporation
    Inventor: Paul F. Thompson
  • Patent number: 4004077
    Abstract: An electric cable having a multi-stranded core and a jacket, in which the voids between and around the core are at least partially filled with a mixture of a hydrophobic powder and a hydrophilic powder. The hydrophobic powder may be coated calcium carbonate and a hydrophilic powder may be polyacrylamide, in which case the polyacrylamide should be between 8% and 30% by weight of the mixture. Preferably the individual conductors are coated with a hydrophobic oil such as a low viscosity paraffinic oil.
    Type: Grant
    Filed: March 7, 1975
    Date of Patent: January 18, 1977
    Assignee: Northern Electric Company Limited
    Inventor: Leo Victor Woytiuk
  • Patent number: 4002819
    Abstract: An electric cable having a multi-stranded core of insulated conductors and a jacket, in which the spaces between and around the conductors are at least partially filled with a mixture which forms a blockage to the penetration of water. The mixture comprises water repellant treated calcium carbonate and high molecular weight polyacrylamide resin which do not react with each other or when in contact with water. Preferably the individual conductors are coated with a hydrophobic liquid such as a low viscosity paraffinic oil.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: January 11, 1977
    Assignee: Northern Electric Company Limited
    Inventor: Leo Victor Woytiuk
  • Patent number: 3997713
    Abstract: Insulated wire or cable having primary insulation between copper conductor and moisture barrier filler and wherein the primary insulation comprises:Ethylene polymer having a density of about 0.928 to 0.955,Copper deactivating amounts of at least one organic compound which is an oxalyl dihydrazide, andAntioxidant effective quantities of at least one organic compound having a molecular weight of .gtoreq.550 and which contains 2 or 3 hindered phenolic groups per molecule thereof.
    Type: Grant
    Filed: February 19, 1974
    Date of Patent: December 14, 1976
    Assignee: Union Carbide Corporation
    Inventor: Robert J. Turbett
  • Patent number: 3996413
    Abstract: A water blocking compound for sheathed stranded cables, the compound being a gel consisting of a major proportion by weight of a substantially non-volatile liquid in which has been dispersed a minor proportion by weight of a solid gellant which is insoluble in said liquid and which does not melt below 100.degree. C, the gel being substantially devoid of any gellant which is soluble in the liquid and/or melts below 100.degree. C.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: December 7, 1976
    Assignee: International Standard Electric Corporation
    Inventors: Stanley George Foord, Walter Eric Simpson, Peter Ivan Aitken Martin
  • Patent number: 3961128
    Abstract: A composition useful for filling communication cables is described which comprises petroleum jelly and a small amount of siliceous material which renders the petroleum jelly viscous at elevated temperatures, and prevents leakage of the petroleum jelly from a cable having a flaw, which is subjected to elevated temperatures.
    Type: Grant
    Filed: December 27, 1973
    Date of Patent: June 1, 1976
    Assignee: Phillips Cables Limited
    Inventor: Shirley Beach
  • Patent number: 3944717
    Abstract: A telephone service cable which runs from a distribution cable to a subscriber's premises or to a pay station is another link in a buried communications system having a water-resisting capability. A spirally quaded core comprised of individually insulated conductors is advanced through a bath of a flame-retardant, water-resistant composition prior to enclosing the core with a jacket. The interstices in the core and between the core and an inner jacket are caused to be filled with the composition which comprises a liquid system and a solid system. The liquid system includes a chlorinated paraffin while the solid system includes a polyvinyl chloride resin and a chlorinated polyethylene. An epoxy stabilizer and a phosphite stabilizer may be added to prevent thermal degradation of the filling composition.
    Type: Grant
    Filed: August 15, 1973
    Date of Patent: March 16, 1976
    Assignees: Western Electric Company, Inc., Bell Telephone Laboratories, Inc.
    Inventors: Joseph Michael Hacker, Stanley Kaufman, Raffaele Antonio Sabia, Earl Salvator Sauer, Charles Edward Tidd, Jr., Raymond Walker