JPS5677932A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS5677932A
JPS5677932A JP15319679A JP15319679A JPS5677932A JP S5677932 A JPS5677932 A JP S5677932A JP 15319679 A JP15319679 A JP 15319679A JP 15319679 A JP15319679 A JP 15319679A JP S5677932 A JPS5677932 A JP S5677932A
Authority
JP
Japan
Prior art keywords
binder
powder
silicon nitride
coated layer
recording medium
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
Application number
JP15319679A
Other languages
Japanese (ja)
Inventor
Katsuaki Itsunoi
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP15319679A priority Critical patent/JPS5677932A/en
Publication of JPS5677932A publication Critical patent/JPS5677932A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To reduce the variation with time and increase the durability of a coated layer, by forming a magnetic layer on a surface of the nonmagnetic supporter along with a coated layer containing the carbon and the silicon nitride provided on the other surface.
CONSTITUTION: The coated layer 3 composed of the carbon powder, the powder of silicon nitride functioning as the reinforcement agent and the binder each is provided at the opposite side of the nonmagnetic supporter 1 containing the magnetic layer 2. The powder of silicon nitride is selected to 10W40wt% for the powder component. For the binder, the ratio P/B between the quantity (weight) P of the powder component and the quantity (weight) B of the binder is set within 0.5W2.0 range. And the hardening agent to the binder is selected to 5W30pts.wt. against 100pts.wt. binder.
COPYRIGHT: (C)1981,JPO&Japio
JP15319679A 1979-11-26 1979-11-26 Magnetic recording medium Pending JPS5677932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15319679A JPS5677932A (en) 1979-11-26 1979-11-26 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15319679A JPS5677932A (en) 1979-11-26 1979-11-26 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS5677932A true JPS5677932A (en) 1981-06-26

Family

ID=15557135

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15319679A Pending JPS5677932A (en) 1979-11-26 1979-11-26 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5677932A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60229235A (en) * 1984-04-27 1985-11-14 Fuji Photo Film Co Ltd Manufacture for magnetic recording medium
US4748073A (en) * 1985-06-29 1988-05-31 Kabushiki Kaisha Toshiba Perpendicular magnetic recording medium with multilayered protective layer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60229235A (en) * 1984-04-27 1985-11-14 Fuji Photo Film Co Ltd Manufacture for magnetic recording medium
JPH0458654B2 (en) * 1984-04-27 1992-09-18 Fuji Photo Film Co Ltd
US4748073A (en) * 1985-06-29 1988-05-31 Kabushiki Kaisha Toshiba Perpendicular magnetic recording medium with multilayered protective layer

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