GB1365647A - Magnetic storage medium - Google Patents

Magnetic storage medium

Info

Publication number
GB1365647A
GB1365647A GB3402472A GB3402472A GB1365647A GB 1365647 A GB1365647 A GB 1365647A GB 3402472 A GB3402472 A GB 3402472A GB 3402472 A GB3402472 A GB 3402472A GB 1365647 A GB1365647 A GB 1365647A
Authority
GB
United Kingdom
Prior art keywords
storage medium
july
tetrahydrofuran
dispersion
dispersed
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
GB3402472A
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
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 Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of GB1365647A publication Critical patent/GB1365647A/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
    • G11B5/702—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 characterised by the bonding agent
    • G11B5/7028—Additives, e.g. crosslinking agents
    • 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
    • G11B5/702—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 characterised by the bonding agent
    • G11B5/7021—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 characterised by the bonding agent containing a polyurethane or a polyisocyanate
    • G11B5/7022—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 characterised by the bonding agent containing a polyurethane or a polyisocyanate containing mixtures of polyurethanes or polyisocyanates with other polymers

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

1365647 Mangetic storage medium AGFAGEVAERT AG 20 July 1972 [23 July 1971] 34024/72 Headings C3P and C3R A magnetic storage medium comprises a layer of magnetizable particles on a support the layer having been formed from a dispersion in a solvent of the particles and (a) a polyether urethane (b) a vinyl chloride/vinyl acetate copolymer containing hydroxyl groups, e.g. as vinyl alcohol groups and (c) a melamine resin as hardener added as the final ingredient of the dispersion. Preferred amounts are (a) 20-55%, (b) 70-40% and (c) 0À4-15% by weight. (a) is preferably the reaction product of polytetramethylene glycol with p,p<SP>1</SP>-diphenylmethane diisocyanate and (c) the reaction product of hexamethylol melamine with a C 1 -C 4 alcohol. In examples needles of γ-Fe 2 O 3 with carbon black are dispersed in tetrahydrofuran/dichloroethane/ methyl glycol acetate or CrO 2 is dispersed in tetrahydrofuran/methyl ethyl ketone together with commercial products (a), (b) and (c), a fatty acid mixture, organic phosphate dispersants and p-toluene sulphonic acid as crosslinking agent and applied to a polyester support, oriented magnetically, dried and heated.
GB3402472A 1971-07-23 1972-07-20 Magnetic storage medium Expired GB1365647A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712136795 DE2136795C3 (en) 1971-07-23 1971-07-23 Process for the production of magnetizable storage media

Publications (1)

Publication Number Publication Date
GB1365647A true GB1365647A (en) 1974-09-04

Family

ID=5814549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3402472A Expired GB1365647A (en) 1971-07-23 1972-07-20 Magnetic storage medium

Country Status (8)

Country Link
JP (1) JPS5528130B1 (en)
BE (1) BE785308A (en)
CA (1) CA977222A (en)
DE (1) DE2136795C3 (en)
FR (1) FR2147113B1 (en)
GB (1) GB1365647A (en)
IT (1) IT961500B (en)
NL (1) NL173450C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1496510A1 (en) * 2002-04-15 2005-01-12 Nagase & Co., Ltd. Stamper original and its manufacturing method, stamper and its manufacturing method, and optical disk

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1496510A1 (en) * 2002-04-15 2005-01-12 Nagase & Co., Ltd. Stamper original and its manufacturing method, stamper and its manufacturing method, and optical disk
EP1496510A4 (en) * 2002-04-15 2007-10-17 Nagase & Co Ltd Stamper original and its manufacturing method, stamper and its manufacturing method, and optical disk

Also Published As

Publication number Publication date
CA977222A (en) 1975-11-04
DE2136795B2 (en) 1977-08-25
DE2136795C3 (en) 1978-04-27
BE785308A (en) 1972-12-27
NL173450C (en) 1984-01-16
NL7209028A (en) 1972-12-27
IT961500B (en) 1973-12-10
FR2147113B1 (en) 1975-10-03
JPS5528130B1 (en) 1980-07-25
DE2136795A1 (en) 1973-03-15
FR2147113A1 (en) 1973-03-09
NL173450B (en) 1983-08-16

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years