JPS5750327A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS5750327A
JPS5750327A JP55112722A JP11272280A JPS5750327A JP S5750327 A JPS5750327 A JP S5750327A JP 55112722 A JP55112722 A JP 55112722A JP 11272280 A JP11272280 A JP 11272280A JP S5750327 A JPS5750327 A JP S5750327A
Authority
JP
Japan
Prior art keywords
magnetic layer
50pts
polyisocyanate
thermoplastic polyurethane
polyurethane elastomer
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
JP55112722A
Other languages
Japanese (ja)
Other versions
JPH0262894B2 (en
Inventor
Takahito Miyoshi
Toshimitsu Okutsu
Masaaki Fujiyama
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP55112722A priority Critical patent/JPS5750327A/en
Priority to US06/292,851 priority patent/US4474843A/en
Priority to DE3132604A priority patent/DE3132604C2/en
Publication of JPS5750327A publication Critical patent/JPS5750327A/en
Publication of JPH0262894B2 publication Critical patent/JPH0262894B2/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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/735—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer
    • G11B5/7356—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2
    • 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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/735—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer
    • G11B5/7356—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2
    • G11B5/7358—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2 specially adapted for achieving a specific property, e.g. average roughness [Ra]

Landscapes

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

Abstract

PURPOSE:To improve durability, etc., by providing a magnetic layer on the surface of a nonmagnetic supporting material and providing a back layer, where fiber resin, thermoplastic polyurethane elastomer, saturated polyester resin, and a polyisocyanate are added as a binder and inorganic powder is included, on the reverse face. CONSTITUTION:In a magnetic tape for audio, video, etc., a coating material where 10-400pts.wt. inorganic powder (grain size 0.1-1mu) such as CaCO3 powder is kneaded and dispersed in methyl ethyl ketone for 100pts.wt. of the total quantity of 20-80pts.wt. fiber resin such as nitrocellulose, 20-50pts.wt. thermoplastic polyurethane elastomer, 1-20pts.wt. saturated polyester resin (copolycondensate of various dibasic acid and various dihydric alcohol), and 10-50pts.wt. polyisocyanate is coated and dried on the facd opposite to the face provided with a magnetic layer of a nonmagnetic supporting material to form a back layer. Thus, running durability is improved without lowering of S/N, and the surface of the magnetic layer is not damaged, and a tape superior in electromagnetic characteristics is obtained.
JP55112722A 1980-08-18 1980-08-18 Magnetic recording medium Granted JPS5750327A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP55112722A JPS5750327A (en) 1980-08-18 1980-08-18 Magnetic recording medium
US06/292,851 US4474843A (en) 1980-08-18 1981-08-14 Magnetic recording medium
DE3132604A DE3132604C2 (en) 1980-08-18 1981-08-18 Magnetic recording material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55112722A JPS5750327A (en) 1980-08-18 1980-08-18 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS5750327A true JPS5750327A (en) 1982-03-24
JPH0262894B2 JPH0262894B2 (en) 1990-12-26

Family

ID=14593883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55112722A Granted JPS5750327A (en) 1980-08-18 1980-08-18 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5750327A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS593723A (en) * 1982-06-29 1984-01-10 Fuji Photo Film Co Ltd Magnetic recording medium
JPS5948829A (en) * 1982-08-14 1984-03-21 バスフ　アクチェン　ゲゼルシャフト Flexible lamination magnetic recording carrier having back layer
JPS59188831A (en) * 1983-04-11 1984-10-26 Fuji Photo Film Co Ltd Magnetic recording medium
JPS59227026A (en) * 1983-06-06 1984-12-20 Fuji Photo Film Co Ltd Magnetic recording medium
JPS61915A (en) * 1984-06-13 1986-01-06 Konishiroku Photo Ind Co Ltd Magnetic recording medium
KR20190073263A (en) 2017-12-18 2019-06-26 가부시키가이샤 에바라 세이사꾸쇼 Substrate processing apparatus, substrate processing apparatus control method, and storage medium storing program

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS593723A (en) * 1982-06-29 1984-01-10 Fuji Photo Film Co Ltd Magnetic recording medium
JPH0479048B2 (en) * 1982-06-29 1992-12-14 Fuji Photo Film Co Ltd
JPS5948829A (en) * 1982-08-14 1984-03-21 バスフ　アクチェン　ゲゼルシャフト Flexible lamination magnetic recording carrier having back layer
JPS59188831A (en) * 1983-04-11 1984-10-26 Fuji Photo Film Co Ltd Magnetic recording medium
JPH0479053B2 (en) * 1983-04-11 1992-12-14 Fuji Photo Film Co Ltd
JPS59227026A (en) * 1983-06-06 1984-12-20 Fuji Photo Film Co Ltd Magnetic recording medium
JPS61915A (en) * 1984-06-13 1986-01-06 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPH0576694B2 (en) * 1984-06-13 1993-10-25 Konishiroku Photo Ind
KR20190073263A (en) 2017-12-18 2019-06-26 가부시키가이샤 에바라 세이사꾸쇼 Substrate processing apparatus, substrate processing apparatus control method, and storage medium storing program

Also Published As

Publication number Publication date
JPH0262894B2 (en) 1990-12-26

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