JPS57159619A - Polyester film for magnetic recording tape - Google Patents

Polyester film for magnetic recording tape

Info

Publication number
JPS57159619A
JPS57159619A JP56045391A JP4539181A JPS57159619A JP S57159619 A JPS57159619 A JP S57159619A JP 56045391 A JP56045391 A JP 56045391A JP 4539181 A JP4539181 A JP 4539181A JP S57159619 A JPS57159619 A JP S57159619A
Authority
JP
Japan
Prior art keywords
film
tape
thickness direction
intrinsic viscosity
magnetic recording
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
JP56045391A
Other languages
Japanese (ja)
Inventor
Satoyuki Nakamura
Yoji Murakami
Tomio Adachi
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.)
Teijin Ltd
Original Assignee
Teijin 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 Teijin Ltd filed Critical Teijin Ltd
Priority to JP56045391A priority Critical patent/JPS57159619A/en
Publication of JPS57159619A publication Critical patent/JPS57159619A/en
Pending 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
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73923—Organic polymer substrates
    • G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate

Abstract

PURPOSE:To obtain the titled polyester excellent in anti-slip property by using the film base satisfying a specific relation formula between the refractive index in the thickness direction of the film and the intrinsic viscosity thereof. CONSTITUTION:Being based on a biaxially oriented film wherein the refraction index [nz] in the thickness direction and the intrinsic viscosity [eta] of polymer are regulated in the ranges of FormulasI-III, a magnetic body (such as magnetic coating material obtained by dispersing metallic powder such as gamma-Fe2O3 etc. in a binder composed of a copolymer such as polyvinyl chloride, polyvinyl acetate, etc., or a mixture thereof or other resin) is vaporized in polyester (homopolymer having polyethylene terephthalate as the main component is preferable) to obtain the desired film. USE:Audio tape, video tape, computer tape, etc.
JP56045391A 1981-03-30 1981-03-30 Polyester film for magnetic recording tape Pending JPS57159619A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56045391A JPS57159619A (en) 1981-03-30 1981-03-30 Polyester film for magnetic recording tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56045391A JPS57159619A (en) 1981-03-30 1981-03-30 Polyester film for magnetic recording tape

Publications (1)

Publication Number Publication Date
JPS57159619A true JPS57159619A (en) 1982-10-01

Family

ID=12717963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56045391A Pending JPS57159619A (en) 1981-03-30 1981-03-30 Polyester film for magnetic recording tape

Country Status (1)

Country Link
JP (1) JPS57159619A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61134228A (en) * 1984-12-04 1986-06-21 Diafoil Co Ltd Manufacture of biaxial oriented polyester film
JPH01264828A (en) * 1988-04-18 1989-10-23 Toyobo Co Ltd Biaxially oriented polyester film
EP0674988A2 (en) 1987-04-07 1995-10-04 Toray Industries, Inc. Polyester film

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5191972A (en) * 1975-02-12 1976-08-12 HORIECHIRENTEREFUTAREETOFUIRUMU
JPS5411179A (en) * 1977-06-28 1979-01-27 Teijin Ltd Polyester film having improved slitting properties
JPS5436382A (en) * 1977-08-25 1979-03-17 Teijin Ltd Polyester film

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5191972A (en) * 1975-02-12 1976-08-12 HORIECHIRENTEREFUTAREETOFUIRUMU
JPS5411179A (en) * 1977-06-28 1979-01-27 Teijin Ltd Polyester film having improved slitting properties
JPS5436382A (en) * 1977-08-25 1979-03-17 Teijin Ltd Polyester film

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61134228A (en) * 1984-12-04 1986-06-21 Diafoil Co Ltd Manufacture of biaxial oriented polyester film
JPH0449452B2 (en) * 1984-12-04 1992-08-11 Daiafoil
EP0674988A2 (en) 1987-04-07 1995-10-04 Toray Industries, Inc. Polyester film
JPH01264828A (en) * 1988-04-18 1989-10-23 Toyobo Co Ltd Biaxially oriented polyester film

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