GB1453124A - Magnetic recording material - Google Patents
Magnetic recording materialInfo
- Publication number
- GB1453124A GB1453124A GB71774A GB71774A GB1453124A GB 1453124 A GB1453124 A GB 1453124A GB 71774 A GB71774 A GB 71774A GB 71774 A GB71774 A GB 71774A GB 1453124 A GB1453124 A GB 1453124A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resins
- layer
- magnetic recording
- esters
- recording layer
- 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
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
- G11B5/7021—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
-
- 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
- G11B5/7023—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 polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins
-
- 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
- G11B5/716—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 two or more magnetic layers
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
1453124 Magnetic recording materials FUJI PHOTO FILM CO Ltd 7 Jan 1974 [5 Jan 1973] 00717/74 Heading B2E A magnetic recording medium of a printing a magnetic recording layer comprises (a) a temporary support, (b) a first magnetic recording layer comprising a ferromagnetic fine powder and a cross-linkable resin binder coated on the temporary support and (c) a second magnetic recording layer comprising a ferromagnetic fine powder and a thermoplastic resin coated on the first recording layer. The total thickness of the first and second layers may be from 5 to 20 microns, the first layer preferably having a thickness of 1 to 8 microns, the first layer preferably having a thickness of 1 to 8 microns and the second layer having a thickness of 6 to 13 microns. Suitable thermoplastic resins have a softening point of less than 150‹C, a mean molecular weight of 10000-200000 and a polymerisation degree of from 200-500. Exemplified are copolymers of vinyl chloride and vinyl acetate, of vinyl chloride and vinylidene chloride, of vinyl chloride and acrylonitrile, of acrylic esters and vinylidene chloride, of acrylic esters and styrene, of methacrylic esters and vinylidene chloride, of methacrylic esters and styrene, polyurethane elastomers and synthetic rubbers. Suitable cross-linkable resins are phenol resins, epoxy resins, hardenable polyurethane resins, melamine resins, alkyd resins, silicone resins and reactive acrylic resins. Numerous suitable ferromagnetic materials are listed. The coatings may be applied from solution by using a doctor blade or by reverse roll. Between the temporary support and the first recording layer may be a layer of a parting agent to facilitate printing. Suitable parting agents are waxes, silicone oils, polymethacrylic esters or copolymers of such esters, polycarbonates and cellulose derivatives such as nitrocellulose, cellulose propionate, cellulose acetate and cellulose acetate butyrate. The parting layer may also contain tungsten bisulphide, molybdenum bisulphide or graphite. An adhering layer may be provided on top of the second recording layer and suitable materials are copolymers of vinyl chloride and vinyl acetate, of ethylene and vinyl acetate, of acrylic esters and acrylonitrile. of methacrylic esters and acrylonitrile, polyvinyl acetate and shellac ester.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP461673A JPS5529497B2 (en) | 1973-01-05 | 1973-01-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1453124A true GB1453124A (en) | 1976-10-20 |
Family
ID=11588978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB71774A Expired GB1453124A (en) | 1973-01-05 | 1974-01-07 | Magnetic recording material |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5529497B2 (en) |
| DE (1) | DE2400162A1 (en) |
| GB (1) | GB1453124A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4364988A (en) * | 1978-07-31 | 1982-12-21 | Hitachi Maxell, Ltd. | Magnetic recording medium |
-
1973
- 1973-01-05 JP JP461673A patent/JPS5529497B2/ja not_active Expired
-
1974
- 1974-01-03 DE DE19742400162 patent/DE2400162A1/en active Pending
- 1974-01-07 GB GB71774A patent/GB1453124A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS4991604A (en) | 1974-09-02 |
| DE2400162A1 (en) | 1974-07-11 |
| JPS5529497B2 (en) | 1980-08-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |