JPS55139636A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS55139636A
JPS55139636A JP4643379A JP4643379A JPS55139636A JP S55139636 A JPS55139636 A JP S55139636A JP 4643379 A JP4643379 A JP 4643379A JP 4643379 A JP4643379 A JP 4643379A JP S55139636 A JPS55139636 A JP S55139636A
Authority
JP
Japan
Prior art keywords
magnetic powder
molecular
resin
magnetic
dispersibility
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
JP4643379A
Other languages
Japanese (ja)
Other versions
JPH0152817B2 (en
Inventor
Masayoshi Kawarai
Masaaki Yasui
Akira Morioka
Seiji Wataya
Takeshi Matsuura
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 JP4643379A priority Critical patent/JPS55139636A/en
Publication of JPS55139636A publication Critical patent/JPS55139636A/en
Publication of JPH0152817B2 publication Critical patent/JPH0152817B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To improve the dispersibility of magnetic powder by using polyurethane resin, which has not less than three hdroxyl groups in all at random positions of molecular ends and molecular chains, and cellulosic resin as binder components of magnetic powder applied on a base.
CONSTITUTION: Polyurethan resin, which has not less than three hydroxyl groups in all at random positions of molecular ends and molecular chains and is about 10,000W100,000 in molecular weight, and cellulosic resin are blended and polyisocyanate of low molecular weight is added at need so as to obtain binding agent components, which are mixed and dispersed in an adequate organic solvent together with magnetic powder of Fe2O3, etc., containing Co. This magnetic coating is applied on a base of a polyester film, etc., and then dried. Consequently, the dispersibility of the magnetic powder is improved, the magnetic layer is also improved, and its SN ratio is further increased.
COPYRIGHT: (C)1980,JPO&Japio
JP4643379A 1979-04-16 1979-04-16 Magnetic recording medium Granted JPS55139636A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4643379A JPS55139636A (en) 1979-04-16 1979-04-16 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4643379A JPS55139636A (en) 1979-04-16 1979-04-16 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS55139636A true JPS55139636A (en) 1980-10-31
JPH0152817B2 JPH0152817B2 (en) 1989-11-10

Family

ID=12747011

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4643379A Granted JPS55139636A (en) 1979-04-16 1979-04-16 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS55139636A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01251419A (en) * 1988-03-31 1989-10-06 Toppan Printing Co Ltd Magnetic recording medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01251419A (en) * 1988-03-31 1989-10-06 Toppan Printing Co Ltd Magnetic recording medium

Also Published As

Publication number Publication date
JPH0152817B2 (en) 1989-11-10

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