GB1121997A - A method of making a magnetizable web - Google Patents
A method of making a magnetizable webInfo
- Publication number
- GB1121997A GB1121997A GB51136/65A GB5113665A GB1121997A GB 1121997 A GB1121997 A GB 1121997A GB 51136/65 A GB51136/65 A GB 51136/65A GB 5113665 A GB5113665 A GB 5113665A GB 1121997 A GB1121997 A GB 1121997A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- mixture
- fe2o3
- monomer
- mixture containing
- 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
- G11B5/7023—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
- G11B5/702—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
- G11B5/73—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
-
- 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
- G11B5/842—Coating a support with a liquid magnetic dispersion
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Paints Or Removers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Laminated Bodies (AREA)
Abstract
A magnetic layer is formed by coating a mixture of polymer solution, polymerizable monomer catalyst, and magnetic material on to a mould, polymerizing the monomer, and then stripping the coating from the mould. The constituents of the mixture may be P.V.C., 1,3-butylene dimethacrylate, t-butyl perbenzoate, and acicular g -Fe2O3 resp. with 1,1,1-trichloroethan as solvent. The mixture may include plasticizers, e.g. dioctyl phthalate, and heat stabilizers, e.g. Ba-Cd Zn, for the polymer; a wetting agent for the Fe2O3, e.g. diethylene glycol monolaurate; and a thixotropic agent to prevent settling, e.g. colloidal S1O2, or carbon black. In the example, a mixture containing the Fe2O3 was thinned with a mixture containing P.V.C., the monomer being present in both, and was sprayed on to the inner surface of a cylindrical steel mould, which may initially have been coated with a silicone, e.g. dimethylpolysiloxane. A further mixture containing P.V.C., and a non-acrylic monomer, was sprayed over the first layer (to form the base). The mould was then heated at 370 DEG F. and the layers stripped from the mould.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US41924064A | 1964-12-17 | 1964-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1121997A true GB1121997A (en) | 1968-07-31 |
Family
ID=23661406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB51136/65A Expired GB1121997A (en) | 1964-12-17 | 1965-12-02 | A method of making a magnetizable web |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE672461A (en) |
| CH (1) | CH429137A (en) |
| DE (1) | DE1504428C3 (en) |
| FR (1) | FR1455733A (en) |
| GB (1) | GB1121997A (en) |
| NL (1) | NL144078B (en) |
| SE (1) | SE331763B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2463477A1 (en) * | 1979-08-06 | 1981-02-20 | Sony Corp | MAGNETIC RECORDING ELEMENT |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU511749B2 (en) * | 1977-01-07 | 1980-09-04 | Commonwealth Scientific And Industrial Research Organisation | Graft copolymers |
-
1965
- 1965-11-17 BE BE672461D patent/BE672461A/xx unknown
- 1965-12-02 GB GB51136/65A patent/GB1121997A/en not_active Expired
- 1965-12-03 FR FR40764A patent/FR1455733A/en not_active Expired
- 1965-12-13 NL NL656516159A patent/NL144078B/en unknown
- 1965-12-13 CH CH1721865A patent/CH429137A/en unknown
- 1965-12-14 DE DE1504428A patent/DE1504428C3/en not_active Expired
- 1965-12-16 SE SE16332/65A patent/SE331763B/xx unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2463477A1 (en) * | 1979-08-06 | 1981-02-20 | Sony Corp | MAGNETIC RECORDING ELEMENT |
| GB2055877A (en) * | 1979-08-06 | 1981-03-11 | Sony Corp | Magnetic recording media |
Also Published As
| Publication number | Publication date |
|---|---|
| CH429137A (en) | 1967-01-31 |
| BE672461A (en) | 1966-03-16 |
| SE331763B (en) | 1971-01-11 |
| NL144078B (en) | 1974-11-15 |
| DE1504428C3 (en) | 1974-06-12 |
| NL6516159A (en) | 1966-06-20 |
| DE1504428B2 (en) | 1973-11-15 |
| DE1504428A1 (en) | 1970-06-04 |
| FR1455733A (en) | 1966-10-14 |
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