US2576134A - Electric communication cable - Google Patents

Electric communication cable Download PDF

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Publication number
US2576134A
US2576134A US767312A US76731247A US2576134A US 2576134 A US2576134 A US 2576134A US 767312 A US767312 A US 767312A US 76731247 A US76731247 A US 76731247A US 2576134 A US2576134 A US 2576134A
Authority
US
United States
Prior art keywords
mixture
styrene
monomeric
discs
polystyrene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US767312A
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English (en)
Inventor
Morley John Frederick
Foord Stanley George
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2576134A publication Critical patent/US2576134A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • H01B11/1856—Discontinuous insulation
    • H01B11/186—Discontinuous insulation having the shape of a disc
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2207/00—Indexing scheme relating to methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F2207/22—Indexing scheme relating to groups G06F7/22 - G06F7/36
    • G06F2207/226—Priority queue, i.e. 1 word in, 1 word out sorter; Output word, i.e. min or max of words in memory

Definitions

  • This invention relates to improvementsin spacing members for .air space cables, i; e. coaxial,
  • spacing members in the form of slotted insulating discs which are employed for maintaining the inner conductor or conductors in position within the outer conducting tube.
  • Such spacing discs are quite well known, at all events for use in coaxial cables, but in practice various problems are encountered in the utilisation thereof, one problem being concerned with the material of which the spacing discs are composed. In this connection it is well known that it is desirable to employ as little solid insulating material as possible between the conductors and further it is desirable that the solid insulating material employed should have low loss characteristics at high frequencies.
  • polystyrene is theoretically a very satisfactory material from which to manufacture the spacing discs; we have however found in practice that substantially pure polystyrene is rather too brittle and that discs of polystyrene show a tendency to split when being pushed on to the inner conductor (considering for the moment a coaxial cable).
  • This tendency may be explained by reference to the accompanying drawing from which it will be noted that as the disc I is being pushed on to the conductor 2 the walls of the slot 3 in the disc are sprung apart with the result that f a strain is put upon the material of the disc along the dash line 4. With discs of pure polystyrene this strain often proves too great and the discs split along the line 4.
  • a spacing disc for an air space cable, consisting of a base of polystyrene containing preferably about 10% of rubber or a closely similar substance and at least 3% and preferably as much as 5% of monomeric styrene. It will be appreciated that small amounts of other materials may also be added to the polystyrene if desired, e. g. polyisobutylene, polyethylene, ceresin wax and so on.
  • the rubber or similar substance may be mixed with monomeric styrene and the styrene polymerised (e. g. at 100 C.) under control until a desired amount of monomeric styrene remains (e. g. 7.5%), at which point polymerisation should be stopped and the material rolled or otherwise shaped into the form of a sheet from which the spacing discs may be punched. If desired, however, the discs may be moulded direct from a mass of the polymerised material.
  • a method may be adopted which comprises partially polymerising styrene milling preferably about 10% of rubber or similar substance into the partially polymerised styrene thereafter further polymerising the styrene until a predetermined amount of monomeric styrene remains and then forming the material into spacing discs.
  • a process for manufacturing air-space electric cable spacing discs having low loss characteristics at high frequencies and being sufliciently resilient to resist substantial distortion substan-' tially permanently without cracking that comprises partially polymerizing styrene to produce a mixture of monomeric and polymericstyrene, milling rubber into said mixture in a quantity of about 10% of the total weight of the mixture,
  • polystyrene containing at least 3% to '7 of monomeric styrene serving as a plasticizer for the polystyrene and approximately 10% of rubber serving as a retaining agent for the monomeric styrene.

Landscapes

  • Organic Insulating Materials (AREA)
  • Communication Cables (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US767312A 1939-06-16 1947-08-07 Electric communication cable Expired - Lifetime US2576134A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17654/39A GB530703A (en) 1939-06-16 1939-06-16 Improvements in or relating to spacing members for air-space cables

Publications (1)

Publication Number Publication Date
US2576134A true US2576134A (en) 1951-11-27

Family

ID=10098924

Family Applications (1)

Application Number Title Priority Date Filing Date
US767312A Expired - Lifetime US2576134A (en) 1939-06-16 1947-08-07 Electric communication cable

Country Status (4)

Country Link
US (1) US2576134A (enrdf_load_stackoverflow)
BE (1) BE476537A (enrdf_load_stackoverflow)
ES (1) ES177206A1 (enrdf_load_stackoverflow)
GB (1) GB530703A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2694692A (en) * 1950-08-25 1954-11-16 Dow Chemical Co Method of making linear interpolymers of monovinyl aromatic compounds and a natural or synthetic rubber

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2175672A (en) * 1938-01-04 1939-10-10 Int Standard Electric Corp Preparation of seals between ceramic material and metal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2175672A (en) * 1938-01-04 1939-10-10 Int Standard Electric Corp Preparation of seals between ceramic material and metal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2694692A (en) * 1950-08-25 1954-11-16 Dow Chemical Co Method of making linear interpolymers of monovinyl aromatic compounds and a natural or synthetic rubber

Also Published As

Publication number Publication date
BE476537A (enrdf_load_stackoverflow)
GB530703A (en) 1940-12-18
ES177206A1 (es) 1947-04-16

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