GB847347A - Improvements in or relating to magnetic recording media - Google Patents
Improvements in or relating to magnetic recording mediaInfo
- Publication number
- GB847347A GB847347A GB40541/58A GB4054158A GB847347A GB 847347 A GB847347 A GB 847347A GB 40541/58 A GB40541/58 A GB 40541/58A GB 4054158 A GB4054158 A GB 4054158A GB 847347 A GB847347 A GB 847347A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tape
- magnetic
- phenols
- parts
- binder
- 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
- G11B5/706—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 composition of the magnetic material
- G11B5/70626—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 composition of the magnetic material containing non-metallic substances
- G11B5/70642—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 composition of the magnetic material containing non-metallic substances iron oxides
- G11B5/70678—Ferrites
- G11B5/70684—Ferro-ferrioxydes
- G11B5/70689—Magnetite
-
- 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
Landscapes
- Paints Or Removers (AREA)
Abstract
847,347. Magnetic recording tapes. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 16, 1958 [Dec. 19, 1957], No. 40541/58. Class 140. [Also in Group XXXV] A magnetic recording medium comprises a non-magnetic backing coated with'a dispersion of magnetic material in a binder which consists of a cured blend of 90-30 parts of an elastomeric copolymer including 55-85 parts butadiene and 45-15 parts of acrylonitrile, and 10-70 parts of an uncured thermosetting resinous condensate of an aldehyde and a phenol. In one example a freshly prepared copolymer of butadiene and acrylonitrile including modifying agents is blended with the phenolic resin materials and a ketone as solvent, added to an attritor with solvent and the magnetic material and attrited till the latter has a size of 1-2 Á. Curing agents and antioxidants are added, the dispersion is filtered, applied to a non-magnetic tape and cured between 200-350‹ F. The phenolic material may be prepared from specified aldehydes and phenols with basic or acidic catalysts. An agent for improving the compatability of the rubber and phenolic resins such as raw cashew nut shell liquid or compounds of this with phenols may be added, and these and other agents such as phenols or isocyanate substituted phenols maybe included for keying the binder to the tape. The tape may be cellulose acetate or a polyester film of the terephthalic acid-ethylene glycol type, thin paper, or fibrous material. The magnetic material may be γFe 2 O 3 , Fe 3 O 4 or natural magnetite and the weight ratio of this to binder may be between 2: 1 and 6: 1. The application of the dispersion to the tape may be by spraying, roll coating or brushing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US847347XA | 1957-12-19 | 1957-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB847347A true GB847347A (en) | 1960-09-07 |
Family
ID=22186888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB40541/58A Expired GB847347A (en) | 1957-12-19 | 1958-12-16 | Improvements in or relating to magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB847347A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3262813A (en) * | 1963-11-19 | 1966-07-26 | Ampex | Magnetic recording medium coated with a binder copolymer of butadiene, acrylonitrile, and a hydroxy methacrylate |
| US3366505A (en) * | 1963-06-27 | 1968-01-30 | Gevaert Photo Prod Nv | Manufacture of magnetic recording material with more durable surface stratum on recording layer |
-
1958
- 1958-12-16 GB GB40541/58A patent/GB847347A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3366505A (en) * | 1963-06-27 | 1968-01-30 | Gevaert Photo Prod Nv | Manufacture of magnetic recording material with more durable surface stratum on recording layer |
| US3262813A (en) * | 1963-11-19 | 1966-07-26 | Ampex | Magnetic recording medium coated with a binder copolymer of butadiene, acrylonitrile, and a hydroxy methacrylate |
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