JPS57158018A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS57158018A JPS57158018A JP4148581A JP4148581A JPS57158018A JP S57158018 A JPS57158018 A JP S57158018A JP 4148581 A JP4148581 A JP 4148581A JP 4148581 A JP4148581 A JP 4148581A JP S57158018 A JPS57158018 A JP S57158018A
- Authority
- JP
- Japan
- Prior art keywords
- tdi
- polyurethane elastomer
- component
- isocyanate component
- 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.)
- Pending
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
- G11B5/7022—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 containing mixtures of polyurethanes or polyisocyanates with other polymers
Abstract
PURPOSE:To improve the dispersibility and durability of magnetic powder by adding polyurethane elastomer which uses cellulosic resin and TDI as an isocyanate component and has specific molecular weight to a binder for a magnetic layer. CONSTITUTION:A binder for a magnetic layer contains polyurethane elastomer which uses cellulosic resin and tolylenediisocyanate (TDI) as an isocyanate component and has >=10,000 mean molecular weight. In this case, said polyurethane elastomer is obtained through the condensation polymerization of a polyol component and TDI as the isocyanate component in the usual way, and as the polyol component, a polyester polyol component of polyhydric alcohol such as 1.4 butanediol, etc., and polybasic acid such as adipic acid, various polyether polyol components, etc., are usable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4148581A JPS57158018A (en) | 1981-03-20 | 1981-03-20 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4148581A JPS57158018A (en) | 1981-03-20 | 1981-03-20 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57158018A true JPS57158018A (en) | 1982-09-29 |
Family
ID=12609646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4148581A Pending JPS57158018A (en) | 1981-03-20 | 1981-03-20 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57158018A (en) |
-
1981
- 1981-03-20 JP JP4148581A patent/JPS57158018A/en active Pending
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