GB1324795A - Magnetic recording element - Google Patents
Magnetic recording elementInfo
- Publication number
- GB1324795A GB1324795A GB5033270A GB5033270A GB1324795A GB 1324795 A GB1324795 A GB 1324795A GB 5033270 A GB5033270 A GB 5033270A GB 5033270 A GB5033270 A GB 5033270A GB 1324795 A GB1324795 A GB 1324795A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic
- magnetic recording
- cro
- recording element
- 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
- G11B5/702—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
-
- 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
- G11B5/70636—CrO2
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
1324795 Magnetic recording medium RCA CORPORATION 22 Oct 1970 [31 Oct 1969] 50332/70 Heading H1H A magnetic recording element comprises a non-magnetic substrate bearing a magnetic coating comprising magnetic chromium dioxide particles dispersed in a polymeric binder, the specific surface area of the CrO 2 being 5-30 m.<SP>2</SP>/g., and the chemical structure of the binder being such that the reactivity rate constant at 120‹ C. of the CrO 2 with the binder is not more than 4 x 10<SP>-4</SP> hrs.<SP>-1</SP>. The reactivity rate constant (k) is defined as A<SP>2</SP>/2t, where A=fractional decrease in magnetic recording element retentivity. Suitable binders (which do not have H atoms available for reaction with CrO 2 to form deleterious CrOOH) are polycarbonates, vinylidene fluoride/hexafluoropropylene copolymers and polymers of formula where R is an aliphatic radical. The magnetic composition may be applied to the substrate (e.g. polyethylene terephthalate) in a solvent, and magnetically orientated before hardening by removal of solvent.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US87287669A | 1969-10-31 | 1969-10-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1324795A true GB1324795A (en) | 1973-07-25 |
Family
ID=25360502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5033270A Expired GB1324795A (en) | 1969-10-31 | 1970-10-22 | Magnetic recording element |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS493566B1 (en) |
DE (1) | DE2052075A1 (en) |
FR (1) | FR2066708A5 (en) |
GB (1) | GB1324795A (en) |
NL (1) | NL7015937A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2556188C3 (en) * | 1975-12-13 | 1979-07-05 | Basf Ag, 6700 Ludwigshafen | Flexible multilayer magnetogram carriers |
JPS5430787U (en) * | 1977-08-02 | 1979-02-28 |
-
1970
- 1970-10-22 GB GB5033270A patent/GB1324795A/en not_active Expired
- 1970-10-23 DE DE19702052075 patent/DE2052075A1/en active Pending
- 1970-10-29 FR FR7039033A patent/FR2066708A5/fr not_active Expired
- 1970-10-30 NL NL7015937A patent/NL7015937A/xx unknown
- 1970-10-31 JP JP9637270A patent/JPS493566B1/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS493566B1 (en) | 1974-01-26 |
NL7015937A (en) | 1971-05-04 |
DE2052075A1 (en) | 1971-05-06 |
FR2066708A5 (en) | 1971-08-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |