US2276084A - Electric insulating material and to conductors insulated with such material - Google Patents

Electric insulating material and to conductors insulated with such material Download PDF

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Publication number
US2276084A
US2276084A US190031A US19003138A US2276084A US 2276084 A US2276084 A US 2276084A US 190031 A US190031 A US 190031A US 19003138 A US19003138 A US 19003138A US 2276084 A US2276084 A US 2276084A
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United States
Prior art keywords
cotton
acetic acid
power factor
electric
cellulose
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Expired - Lifetime
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US190031A
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English (en)
Inventor
New Archibald Alan
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International Standard Electric Corp
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International Standard Electric Corp
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Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2276084A publication Critical patent/US2276084A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/185—Substances or derivates of cellulose
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation

Definitions

  • Esters of cellulose have frequently been proposed for use as electric insulating materials, both in the form of threads spun from such esters and in the formrof native cellulose such as cotton or paper that has been partially esteriiied.
  • the single gure of the drawing shows a c oaxialcable insulated in accordance with my invention.
  • an electric conductor for the transmission of electric (whichk may be superimposed on D. C. currents or on A. C. currents of lower frequency) insulated by native cellulosic material that has been esterifled up to and beyond the diacyl stage without loss of tensile strength sufficient to prevent the material from being applied to the' conductor in the manner ln which it is usually applied, including native cellulosic materials that have been fully esteried without 4such loss of 4tensile strength.
  • cellulose esters to be considered are those of carboxylic acids having from 2 5 carbon atoms, as these are the esters that We have so far found suitable, but the invention must be taken to include mixed cellulose esters of such acids.
  • the power factor of acylated cotton yarn having 55% combined acetic acid content for example, increases from 0.0055 at 1' kc. to 0.008'at 1000 kc. under conditions of ordinary atmospheric humidity whilst the power factor of acetylated cotton yarn having 29% combined acetic acid content increases under similar conditions from 0.009 at 1 kc. to 0.015 at 1000 kc. Moreover; contrary to previous experience with lower combined acetic contents, a large improvement in power factor at 1000 kc. even under dry conditions has been obtained by esterification of cotton tok a combined acetic acid content of- 55% and above.
  • the power factor of acetylated cotton yarn having 29% combined acetic acid content is 0.013 for 1000 kc. under dry conditions, but that of cotton yarn acetylated to 55% acetic acid content Also, under dry conditions the power factor of cotton acetylated to 55% is nearly constant between 1 kc. and 1000 kc., only rising from .0045 to .0055 over this wide frequency range. y
  • the present invention is of particular value when applied to coaxial conductor electric cables for the transmissionof a very wide frequency band, and more especially to cables constructed as shown in U. S. patents to Wentz Nos. 2,018,477 issued October 22, 1935 and 2,038,973, issued April 28, 1936 and in the figure of the drawing in which, according to the present invention, the insulating separator or separators is or are composed of native cellulose esterified to or beyond the diacyl stage.
  • the separator wevhave been able to raise the upper limit of the frequency band satisfactorily transmitted in this type of cable as compared with cables wherein lower esterified cellulose has been used as the separator.
  • Example 1 The constitution of the bath for the preparation of lmaterials to be used with electric ccnductors according to the invention can bez- Percent Toluene, petrol or other inert diluent 50 Acetic anhydride 25 Acetic acid 20 Zinc chloride 5
  • Example 2 Cotton yarn or other cotton material purified by bucking and bleaching is carefully washed, then dried to a moisture content of about 1-2% and immersed for two hours at 40 C. in acetic acid containing about 2% of water, then taken out, pressed to 60% of adherent liquid and then immersed in the following bath:
  • An i electric conductor forming part of a cable for transmission of frequencies of l0 kc.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Organic Insulating Materials (AREA)
US190031A 1937-02-26 1938-02-11 Electric insulating material and to conductors insulated with such material Expired - Lifetime US2276084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB228302X 1937-02-26

Publications (1)

Publication Number Publication Date
US2276084A true US2276084A (en) 1942-03-10

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Family Applications (1)

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US190031A Expired - Lifetime US2276084A (en) 1937-02-26 1938-02-11 Electric insulating material and to conductors insulated with such material

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US (1) US2276084A (de)
CH (1) CH228302A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890263A (en) * 1952-11-18 1959-06-09 Hackethal Draht & Kabelwerk Ag Coaxial cables
US3249901A (en) * 1962-10-12 1966-05-03 Georg G Spinner Dielectric supports for high frequency coaxial lines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890263A (en) * 1952-11-18 1959-06-09 Hackethal Draht & Kabelwerk Ag Coaxial cables
US3249901A (en) * 1962-10-12 1966-05-03 Georg G Spinner Dielectric supports for high frequency coaxial lines

Also Published As

Publication number Publication date
CH228302A (de) 1943-08-15

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