GB650675A - Flexible coated magnetic record member and method of making same - Google Patents

Flexible coated magnetic record member and method of making same

Info

Publication number
GB650675A
GB650675A GB20537/46A GB2053746A GB650675A GB 650675 A GB650675 A GB 650675A GB 20537/46 A GB20537/46 A GB 20537/46A GB 2053746 A GB2053746 A GB 2053746A GB 650675 A GB650675 A GB 650675A
Authority
GB
United Kingdom
Prior art keywords
acetate
autoclave
magnetic recording
heating
magnetizable particles
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
Application number
GB20537/46A
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.)
Brush Development Co
Original Assignee
Brush Development Co
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 Brush Development Co filed Critical Brush Development Co
Publication of GB650675A publication Critical patent/GB650675A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer

Abstract

Cellulose derivative compositions for coating paper to produce magnetic recording material comprise magnetizable particles such as magnetite powder mixed with (a) cellulose acetate, triphenyl phosphate, and methyl ethyl ketone; or (b) nitrocellulose of low viscosity, diethylene glycol monobutyl ether, dibutyl phthalate, and blown castor oil. Vinyl resin compositions for the same purpose comprise similar magnetizable particles, polyvinyl acetate or a copolymer of acrylic and methacrylic esters dissolved in toluene or ethyl alcohol. Optional additions are glycerine, tannin, and the acetate of ethylene glycol monoethyl ether.ALSO:Magnetite powder for use in magnetic recording tapes is made by heating to 125 DEG F. in an autoclave a 15 DEG B<\>ae. aqueous solution of ferrous sulphate, adding aqueous sodium hydroxide while stirring, heating to 250 DEG F. while the pressure is allowed to rise to 60 lbs. per sq. inch above atmospheric, and bubbling air through the contents of the autoclave for 2 hours. The oxide is separated by filtering, dried, and pulverized.
GB20537/46A 1945-08-28 1946-07-09 Flexible coated magnetic record member and method of making same Expired GB650675A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US650675XA 1945-08-28 1945-08-28

Publications (1)

Publication Number Publication Date
GB650675A true GB650675A (en) 1951-02-28

Family

ID=22060110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20537/46A Expired GB650675A (en) 1945-08-28 1946-07-09 Flexible coated magnetic record member and method of making same

Country Status (1)

Country Link
GB (1) GB650675A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2799609A (en) * 1955-01-24 1957-07-16 Harold R Dalton Magnetic transducing webs and method of manufacture
US2825558A (en) * 1955-04-25 1958-03-04 Honeywell Regulator Co Electrostatic tape and methods of construction
US3019125A (en) * 1958-11-18 1962-01-30 Ibm Thin magnetic film

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2799609A (en) * 1955-01-24 1957-07-16 Harold R Dalton Magnetic transducing webs and method of manufacture
US2825558A (en) * 1955-04-25 1958-03-04 Honeywell Regulator Co Electrostatic tape and methods of construction
US3019125A (en) * 1958-11-18 1962-01-30 Ibm Thin magnetic film

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