JPS57158016A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57158016A
JPS57158016A JP4148381A JP4148381A JPS57158016A JP S57158016 A JPS57158016 A JP S57158016A JP 4148381 A JP4148381 A JP 4148381A JP 4148381 A JP4148381 A JP 4148381A JP S57158016 A JPS57158016 A JP S57158016A
Authority
JP
Japan
Prior art keywords
tdi
tolylenediisocyanate
polyurethane elastomer
component
isocyanate component
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.)
Granted
Application number
JP4148381A
Other languages
Japanese (ja)
Other versions
JPH0370286B2 (en
Inventor
Takezo Shimizu
Fumio Togawa
Haruo Ando
Susumu Kitaoka
Kosaburo Sato
Osamu Saito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP4148381A priority Critical patent/JPS57158016A/en
Publication of JPS57158016A publication Critical patent/JPS57158016A/en
Publication of JPH0370286B2 publication Critical patent/JPH0370286B2/ja
Granted legal-status Critical Current

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

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To improve the dispersibility and durability of magnetic powder by adding polyurethane elastomer which uses TDI as an isocyanate component and has mean molecular weight within a specific range to a binder for a magnetic layer. CONSTITUTION:A binder for a magnetic layer contains polyurethane elastomer which uses 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. As TDI, either of 2.4-tolylenediisocyanate and 2.6-tolylenediisocyanate and may be used.
JP4148381A 1981-03-20 1981-03-20 Magnetic recording medium Granted JPS57158016A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4148381A JPS57158016A (en) 1981-03-20 1981-03-20 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4148381A JPS57158016A (en) 1981-03-20 1981-03-20 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57158016A true JPS57158016A (en) 1982-09-29
JPH0370286B2 JPH0370286B2 (en) 1991-11-07

Family

ID=12609587

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4148381A Granted JPS57158016A (en) 1981-03-20 1981-03-20 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57158016A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53128306A (en) * 1977-04-14 1978-11-09 Sony Corp Magnetic recording medium
JPS5468206A (en) * 1977-11-10 1979-06-01 Sony Corp Magnetic recording medium
JPS54107710A (en) * 1978-02-10 1979-08-23 Victor Co Of Japan Ltd Magnetic recording binder
JPS5538693A (en) * 1978-09-13 1980-03-18 Toyo Tire & Rubber Co Ltd Magnetic recording medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53128306A (en) * 1977-04-14 1978-11-09 Sony Corp Magnetic recording medium
JPS5468206A (en) * 1977-11-10 1979-06-01 Sony Corp Magnetic recording medium
JPS54107710A (en) * 1978-02-10 1979-08-23 Victor Co Of Japan Ltd Magnetic recording binder
JPS5538693A (en) * 1978-09-13 1980-03-18 Toyo Tire & Rubber Co Ltd Magnetic recording medium

Also Published As

Publication number Publication date
JPH0370286B2 (en) 1991-11-07

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