GB1366192A - Dual-layer magnetic recording tape - Google Patents
Dual-layer magnetic recording tapeInfo
- Publication number
- GB1366192A GB1366192A GB888772A GB888772A GB1366192A GB 1366192 A GB1366192 A GB 1366192A GB 888772 A GB888772 A GB 888772A GB 888772 A GB888772 A GB 888772A GB 1366192 A GB1366192 A GB 1366192A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- magnetisable
- magnetic recording
- microinches
- thickness
- 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
- 239000002355 dual-layer Substances 0.000 title abstract 2
- 239000010410 layer Substances 0.000 abstract 10
- 229910001566 austenite Inorganic materials 0.000 abstract 4
- 239000011230 binding agent Substances 0.000 abstract 2
- 239000002904 solvent Substances 0.000 abstract 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000003431 cross linking reagent Substances 0.000 abstract 1
- 238000005065 mining Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 239000013034 phenoxy resin Substances 0.000 abstract 1
- 229920006287 phenoxy resin Polymers 0.000 abstract 1
- 230000000704 physical effect Effects 0.000 abstract 1
- -1 polyethylene terephthalate Polymers 0.000 abstract 1
- 229920000139 polyethylene terephthalate Polymers 0.000 abstract 1
- 239000005020 polyethylene terephthalate Substances 0.000 abstract 1
- 229920003225 polyurethane elastomer Polymers 0.000 abstract 1
- 230000003746 surface roughness Effects 0.000 abstract 1
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
- G11B5/716—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
1366192 Magnetic recording tape MINNESOTA MINING & MFG CO 25 Feb 1972 [26 Feb 1971 23 Aug 1971] 8887/72 Heading B2E A magnetic recording tape has a non- magnetisable backing member carrying a duallayer magnetisable coating of up to 600 microinches in thickness, each layer being a homogeneous admixture comprising a major proportion of magnetisable particles and a minor proportion of nonmagnetisable binder, characterised in that the outer magnetisable layer has a thickness of 20-70 microinches and a surface roughness not exceeding about 10 microinches and the inner magnetisable layer has a thickness at least equal to that of the outer layer. In making such tapes the inner layer may comprise a binder and a crosslinking agent such that sufficient curing occurs to prevent any volatile solvent in which the outer layer is applied from affecting the physical properties of the inner layer. Preferably the inner layer contains γ-Fe 2 O 3 and the outer layer CoO modified γ-Fe 2 O 3 . In examples polyurethane elastomer and phenoxy resin in a volatile solvent are used as a medium in which to suspend γ-Fe 2 O 3 before application to a polyethylene terephthalate backing tape. The outer layer is similarly constituted, substituting CoO-Fe 2 O 3 for γ-Fe 2 O 3 alone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11919071A | 1971-02-26 | 1971-02-26 | |
| US17411371A | 1971-08-23 | 1971-08-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1366192A true GB1366192A (en) | 1974-09-11 |
Family
ID=26817106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB888772A Expired GB1366192A (en) | 1971-02-26 | 1972-02-25 | Dual-layer magnetic recording tape |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS5228364B1 (en) |
| AR (1) | AR192622A1 (en) |
| BE (1) | BE779893A (en) |
| CA (1) | CA963321A (en) |
| DE (1) | DE2208792B2 (en) |
| ES (1) | ES399853A1 (en) |
| FR (1) | FR2126451B1 (en) |
| GB (1) | GB1366192A (en) |
| IT (1) | IT948737B (en) |
| NL (1) | NL7202051A (en) |
| SE (1) | SE382274B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5843815B2 (en) * | 1975-10-23 | 1983-09-29 | 富士写真フイルム株式会社 | Jikiki Loc Tape |
| JPS5817539A (en) * | 1981-07-21 | 1983-02-01 | Sony Corp | Magnetic recording medium |
| NL8220324A (en) * | 1981-09-28 | 1983-08-01 | Sony Corp | MAGNETIC RECORD MEDIUM. |
| DE3420466A1 (en) * | 1984-06-01 | 1985-12-05 | Basf Ag, 6700 Ludwigshafen | METHOD FOR PRODUCING MAGNETOGRAM CARRIERS |
| JPH0727631B2 (en) * | 1987-09-21 | 1995-03-29 | 富士写真フイルム株式会社 | Magnetic recording medium |
| JP2581570B2 (en) * | 1987-10-19 | 1997-02-12 | 富士写真フイルム株式会社 | Video magnetic recording media |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB671269A (en) * | 1949-11-02 | 1952-04-30 | Brush Dev Co | Improvements in or relating to multi-layer magnetic record members |
-
1972
- 1972-02-16 NL NL7202051A patent/NL7202051A/xx unknown
- 1972-02-16 SE SE182172A patent/SE382274B/en unknown
- 1972-02-16 ES ES399853A patent/ES399853A1/en not_active Expired
- 1972-02-24 DE DE19722208792 patent/DE2208792B2/en not_active Ceased
- 1972-02-25 BE BE779893A patent/BE779893A/en not_active IP Right Cessation
- 1972-02-25 AR AR24071072A patent/AR192622A1/en active
- 1972-02-25 JP JP47019577A patent/JPS5228364B1/ja active Pending
- 1972-02-25 GB GB888772A patent/GB1366192A/en not_active Expired
- 1972-02-25 IT IT4857672A patent/IT948737B/en active
- 1972-02-25 FR FR7206606A patent/FR2126451B1/fr not_active Expired
- 1972-02-25 CA CA135,600A patent/CA963321A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL7202051A (en) | 1972-08-29 |
| DE2208792B2 (en) | 1976-08-19 |
| ES399853A1 (en) | 1975-09-16 |
| FR2126451A1 (en) | 1972-10-06 |
| SE382274B (en) | 1976-01-19 |
| FR2126451B1 (en) | 1975-10-24 |
| JPS5228364B1 (en) | 1977-07-26 |
| IT948737B (en) | 1973-06-11 |
| AR192622A1 (en) | 1973-02-28 |
| CA963321A (en) | 1975-02-25 |
| DE2208792A1 (en) | 1973-03-08 |
| BE779893A (en) | 1972-08-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3833412A (en) | Magnetic recording medium | |
| GB1497891A (en) | Magnetic recording media | |
| GB1293869A (en) | Ferromagnetic compositions and magnetic recording elements | |
| GB1320779A (en) | Magnetic coating formulation for recording tape | |
| GB1498165A (en) | Magnetic recording media | |
| GB1386683A (en) | Dual-layer recording tape | |
| GB1244109A (en) | Magnetic recording medium | |
| GB1366192A (en) | Dual-layer magnetic recording tape | |
| GB1384918A (en) | Magnetic record medium and method of treating same | |
| US4696869A (en) | Magnetic recording medium | |
| JPS6289223A (en) | Magnetic disk | |
| KR850006101A (en) | Magnetic recording media | |
| GB1450635A (en) | Magnetic recording tapes | |
| JPS6338769B2 (en) | ||
| US4720413A (en) | Magnetic recording medium having a back coat layer | |
| JPS62222427A (en) | Magnetic recording medium | |
| JPS5750327A (en) | Magnetic recording medium | |
| GB979528A (en) | Magnetic transfer tapes | |
| JP2924443B2 (en) | Magnetic recording media | |
| KR920009771B1 (en) | Magnetic recording media | |
| JPS6222172B2 (en) | ||
| GB1530911A (en) | Magnetisable recording tapes | |
| JP2995701B2 (en) | Magnetic recording media | |
| JP2995702B2 (en) | Magnetic recording media | |
| JPS57143732A (en) | Magnetic recording medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |