GB1401305A - Magnetic recording materials - Google Patents

Magnetic recording materials

Info

Publication number
GB1401305A
GB1401305A GB4067272A GB4067272A GB1401305A GB 1401305 A GB1401305 A GB 1401305A GB 4067272 A GB4067272 A GB 4067272A GB 4067272 A GB4067272 A GB 4067272A GB 1401305 A GB1401305 A GB 1401305A
Authority
GB
United Kingdom
Prior art keywords
coating
magnetic recording
film
recording material
magnetic
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
GB4067272A
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 GB4067272A priority Critical patent/GB1401305A/en
Priority to US920016D priority patent/UST920016I4/en
Priority to DE19732344341 priority patent/DE2344341A1/en
Publication of GB1401305A publication Critical patent/GB1401305A/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
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73923—Organic polymer substrates
    • G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate
    • 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
    • G11B5/735—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 characterised by the back layer
    • G11B5/7356—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 characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2

Abstract

1401305 Coated magnetic recording material IMPERIAL CHEMICAL INDUSTRIES LTD 3 Aug 1973 [1 Sept 1972] 40672/72 Heading B2E A magnetic recording material comprises a molecularly oriented and heat set polyester film having a coating comprising vinyl chloride polymer particles on one surface and a magnetic coating on the other surface, the vinyl chloride polymer coating having a weight of 0.01 to 1.4 mgdm<SP>-2</SP>. The preferred film is polyethylene terephthalate which may be biaxially oriented. Biaxially oriented film may be further stretched in the transverse direction and then to a greater extent in the longitudinal direction. The coating may be applied prior to, during or after stretching, from aqueous dispersions followed by heating to dry the coating and fuse the particles to the film surface. The magnetic coating may be a ferromagnetic material applied by vacuum deposition, electroless plating, electrodeposition or as a dispersion in a resin binder e.g. polyurethane, cellulose acetate, cellulose nitrate. The recording material may be in the form of magnetic recording tape e.g. computer, audio or video tape.
GB4067272A 1972-09-01 1972-09-01 Magnetic recording materials Expired GB1401305A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB4067272A GB1401305A (en) 1972-09-01 1972-09-01 Magnetic recording materials
US920016D UST920016I4 (en) 1972-09-01 1973-08-21 Defensive publication
DE19732344341 DE2344341A1 (en) 1972-09-01 1973-09-03 MAGNETIC RECORDING MATERIALS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4067272A GB1401305A (en) 1972-09-01 1972-09-01 Magnetic recording materials

Publications (1)

Publication Number Publication Date
GB1401305A true GB1401305A (en) 1975-07-16

Family

ID=10416058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4067272A Expired GB1401305A (en) 1972-09-01 1972-09-01 Magnetic recording materials

Country Status (2)

Country Link
DE (1) DE2344341A1 (en)
GB (1) GB1401305A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140329101A1 (en) * 2011-10-19 2014-11-06 Mitsubishi Plastics, Inc. Polyester film

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3175106D1 (en) * 1980-08-18 1986-09-18 Matsushita Electric Ind Co Ltd Magnetic recording media and process for fabricating the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140329101A1 (en) * 2011-10-19 2014-11-06 Mitsubishi Plastics, Inc. Polyester film
US9523000B2 (en) * 2011-10-19 2016-12-20 Mitsubishi Plastics, Inc. Polyester film

Also Published As

Publication number Publication date
DE2344341A1 (en) 1974-03-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee