JPS57138050A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57138050A
JPS57138050A JP2449181A JP2449181A JPS57138050A JP S57138050 A JPS57138050 A JP S57138050A JP 2449181 A JP2449181 A JP 2449181A JP 2449181 A JP2449181 A JP 2449181A JP S57138050 A JPS57138050 A JP S57138050A
Authority
JP
Japan
Prior art keywords
magnetic
polystylene
sulfonic acid
powder
radical
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
JP2449181A
Other languages
Japanese (ja)
Other versions
JPH0318248B2 (en
Inventor
Kenji Sumiya
Masayoshi Kawarai
Tsunetaka Matsumoto
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 JP2449181A priority Critical patent/JPS57138050A/en
Publication of JPS57138050A publication Critical patent/JPS57138050A/en
Publication of JPH0318248B2 publication Critical patent/JPH0318248B2/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

Abstract

PURPOSE:To improve scattering perfrmance of magnetic powder, by using polystylene or stylene copolymer including sulfonic acid radical or metallic sulfonate radical as a binder component for magnetic layers. CONSTITUTION:Polystylene or stylen copolymer introduced with sulfonic acid radical or metallic sulfonate radical is used as binding component of magnetic layers. For example, a magnetic paint having the composition of 100pts. gamma-Fe2O3 powder, 4pts. alpha-Fe2O3 powder, 2pts. carbon black, 22pts. partially sulfonated polystylene (0.05-3mol% of sulfonic acid content), 65pts. methyl isobutyl ketone, and 65pts. toluene, is coated on a polyester film, dried and a magnetic layer, 5mu thick is made. Thus, the scattering perfrmance of magnetic powder is improved.
JP2449181A 1981-02-20 1981-02-20 Magnetic recording medium Granted JPS57138050A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2449181A JPS57138050A (en) 1981-02-20 1981-02-20 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2449181A JPS57138050A (en) 1981-02-20 1981-02-20 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57138050A true JPS57138050A (en) 1982-08-26
JPH0318248B2 JPH0318248B2 (en) 1991-03-12

Family

ID=12139647

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2449181A Granted JPS57138050A (en) 1981-02-20 1981-02-20 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57138050A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001019555A1 (en) * 1999-09-16 2001-03-22 Kemet Electronics Corporation Process for producing powder metallurgy compacts free from binder contamination and compacts produced thereby

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54151417A (en) * 1978-05-19 1979-11-28 Toyo Boseki Magnetic recording medium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54151417A (en) * 1978-05-19 1979-11-28 Toyo Boseki Magnetic recording medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001019555A1 (en) * 1999-09-16 2001-03-22 Kemet Electronics Corporation Process for producing powder metallurgy compacts free from binder contamination and compacts produced thereby
US6315808B1 (en) 1999-09-16 2001-11-13 Kemet Electronics Corporation Process for producing powder metallurgy compacts free from binder contamination and compacts produced thereby
US6375710B2 (en) 1999-09-16 2002-04-23 Kemet Electronics Corporation Process for producing powder metallurgy compacts free from binder contamination and compacts produced thereby
GB2368850A (en) * 1999-09-16 2002-05-15 Kemet Electronics Corp Process for producing powder metallurgy compacts free from binder contamination and compacts produced thereby

Also Published As

Publication number Publication date
JPH0318248B2 (en) 1991-03-12

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