GB1139346A - Improved magnetic recording tape - Google Patents

Improved magnetic recording tape

Info

Publication number
GB1139346A
GB1139346A GB23793/66A GB2379366A GB1139346A GB 1139346 A GB1139346 A GB 1139346A GB 23793/66 A GB23793/66 A GB 23793/66A GB 2379366 A GB2379366 A GB 2379366A GB 1139346 A GB1139346 A GB 1139346A
Authority
GB
United Kingdom
Prior art keywords
magnetic particles
magnetic
recording tape
magnetic recording
ethylene glycol
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
GB23793/66A
Inventor
Kenneth Barry Jarrett
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB23793/66A priority Critical patent/GB1139346A/en
Priority to BE698832D priority patent/BE698832A/xx
Priority to LU53758D priority patent/LU53758A1/xx
Priority to CH743667A priority patent/CH460375A/en
Publication of GB1139346A publication Critical patent/GB1139346A/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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/7368—Non-polymeric layer under the lowermost magnetic recording layer
    • 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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73923—Organic polymer substrates
    • G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate

Landscapes

  • Paints Or Removers (AREA)

Abstract

1,139,346. Magnetic structures. IMPERIAL CHEMICAL INDUSTRIES Ltd. 12 May, 1967 [27 May, 1966], No. 23793/66. Heading H1H. A magnetic recording tape comprises a base of polyethylene terephthalate containing 0À25- 0À75% by wt. of inert non-magnetic particles of average size 0À1-2Á, coated with a layer containing magnetic particles. The inert particles may be TiO 2 or china clay, and may be ball milled with ethylene glycol and added to the ethylene glycol and dimethyl terephthalate used to prepare the polymer. The base may be orientated by stretching in one or both directions in the plane of the film, and heat set under tension at 150-200‹ C. The magnetic particles may be Fe 2 O 3 , Fe 3 O 4 or Cr oxide, and may be held in a binder of cellulose acetate or nitrate, polyvinyl acetate or butyral, or a copolymer of vinylidene with acrylonitrile or vinyl chloride or acetate. There may be an intermediate adhesive layer.
GB23793/66A 1966-05-27 1966-05-27 Improved magnetic recording tape Expired GB1139346A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB23793/66A GB1139346A (en) 1966-05-27 1966-05-27 Improved magnetic recording tape
BE698832D BE698832A (en) 1966-05-27 1967-05-22
LU53758D LU53758A1 (en) 1966-05-27 1967-05-26
CH743667A CH460375A (en) 1966-05-27 1967-05-26 Magnetic tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23793/66A GB1139346A (en) 1966-05-27 1966-05-27 Improved magnetic recording tape

Publications (1)

Publication Number Publication Date
GB1139346A true GB1139346A (en) 1969-01-08

Family

ID=10201416

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23793/66A Expired GB1139346A (en) 1966-05-27 1966-05-27 Improved magnetic recording tape

Country Status (4)

Country Link
BE (1) BE698832A (en)
CH (1) CH460375A (en)
GB (1) GB1139346A (en)
LU (1) LU53758A1 (en)

Also Published As

Publication number Publication date
BE698832A (en) 1967-11-22
LU53758A1 (en) 1967-07-26
CH460375A (en) 1968-07-31

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