GB1448593A - Manufacture of magnetic discs with thin magnetic coatings - Google Patents

Manufacture of magnetic discs with thin magnetic coatings

Info

Publication number
GB1448593A
GB1448593A GB5206373A GB5206373A GB1448593A GB 1448593 A GB1448593 A GB 1448593A GB 5206373 A GB5206373 A GB 5206373A GB 5206373 A GB5206373 A GB 5206373A GB 1448593 A GB1448593 A GB 1448593A
Authority
GB
United Kingdom
Prior art keywords
magnetic
curable
binder
coating
pigment
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
GB5206373A
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of GB1448593A publication Critical patent/GB1448593A/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
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • 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
    • G11B5/708—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 addition of non-magnetic particles to the layer
    • G11B5/7085—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 addition of non-magnetic particles to the layer non-magnetic abrasive particles

Abstract

1448593 Magnetic coated recording discs BASF AG 9 Nov 1973 [10 Nov 1972] 52063/73 Heading B2E Magnetic recording discs are produced by coating a non-magnetic metal base disc with a dispersion of finely divided magnetic pigment and finely divided non-magnetic pigment having a Moh's hardness of at least 6 in a solution in an organic solvent of a binder, drying the coating, and optionally curing, and subsequently grinding and polishing, the non- magnetic metal base disc prior to application of the magnetic coating being provided with a hard, non-magnetic intermediate layer which can be ground and polished, by applying a dispersion of a finely divided non-magnetic pigment having a Mohs hardness of at least 6 in a curable binder which provides firm cohesion of the non-magnetic pigment particles and good adhesion of the intermediate layer to the non- magnetic metal base discs. Suitable non-magnetic pigments are aluminium oxide, chromium oxide, quartz, cerium dioxide, alpha-iron oxide and titanium dioxide. The curable binder may be polyurethanes, or mixtures thereof with polycarbonates, curable epoxy resins and curable amino, melamine or phenolic resins, curable epoxy resins and their mixtures with polyaminoamides, or with curable melamine-formaldehyde precondensates or phenol-formaldehyde precondensates or mixtures of curable N-methylol acrylamide or N-methylolmethacrylamide copolymers with curable soluble amino or phenolic precondensates. A preferred binder is a mixture of curable epoxy resins or polyepoxide compounds as curable precondensates of phenols or alkylphenols and formaldehyde. The weight ratio of pigment to binder may be 0.5-1 to 5-1. Preferably the intermediate layer is ground and polished prior to application of the magnetic coating. Suitable non- magnetic pigments for the magnetic coating are silicon carbide, boron carbide, aluminium oxide or silicon dioxide.
GB5206373A 1972-11-10 1973-11-09 Manufacture of magnetic discs with thin magnetic coatings Expired GB1448593A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722254981 DE2254981A1 (en) 1972-11-10 1972-11-10 METHOD OF MANUFACTURING MAGNETIC PLATES WITH THIN MAGNETIC LAYERS

Publications (1)

Publication Number Publication Date
GB1448593A true GB1448593A (en) 1976-09-08

Family

ID=5861309

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5206373A Expired GB1448593A (en) 1972-11-10 1973-11-09 Manufacture of magnetic discs with thin magnetic coatings

Country Status (7)

Country Link
JP (1) JPS50803A (en)
BE (1) BE807105A (en)
DE (1) DE2254981A1 (en)
FR (1) FR2206548B1 (en)
GB (1) GB1448593A (en)
IT (1) IT996425B (en)
NL (1) NL7315209A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581296A (en) * 1984-03-02 1986-04-08 Basf Aktiengesellschaft Magnetic recording media

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067682A (en) * 1975-08-01 1978-01-10 Nichols Engineering & Research Corporation Oil burner system
JPS5260308U (en) * 1975-10-28 1977-05-02
JPS5613525A (en) * 1979-07-16 1981-02-09 Tdk Corp Magnetic recording medium
JPS5724027A (en) * 1980-07-16 1982-02-08 Tdk Corp Magnetic recording medium
FR2638000B1 (en) * 1988-10-18 1990-12-14 Kodak Pathe LARGE CAPACITY MAGNETIC MEMORY CARD AND MANUFACTURING METHOD

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1804393A1 (en) * 1968-10-22 1970-05-27 Basf Ag Process for the production of magnetic recording media
CH506155A (en) * 1969-04-14 1971-04-15 Ibm Magnetic data storage device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581296A (en) * 1984-03-02 1986-04-08 Basf Aktiengesellschaft Magnetic recording media

Also Published As

Publication number Publication date
FR2206548A1 (en) 1974-06-07
IT996425B (en) 1975-12-10
NL7315209A (en) 1974-05-14
FR2206548B1 (en) 1979-02-23
BE807105A (en) 1974-05-09
DE2254981A1 (en) 1974-06-12
JPS50803A (en) 1975-01-07

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Legal Events

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