JPS57162126A - Polyester film for magnetic recording tape - Google Patents

Polyester film for magnetic recording tape

Info

Publication number
JPS57162126A
JPS57162126A JP56045394A JP4539481A JPS57162126A JP S57162126 A JPS57162126 A JP S57162126A JP 56045394 A JP56045394 A JP 56045394A JP 4539481 A JP4539481 A JP 4539481A JP S57162126 A JPS57162126 A JP S57162126A
Authority
JP
Japan
Prior art keywords
polyester film
refractive index
recording tape
magnetic recording
intrinsic viscosity
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
JP56045394A
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 JP56045394A priority Critical patent/JPS57162126A/en
Publication of JPS57162126A publication Critical patent/JPS57162126A/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

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To improve slit characteristics by specifying the intrinsic viscosity and thickness-directional refractive index of a base film used for a magnetic recording tape. CONSTITUTION:A polyester film satisfies relations among a refractive index nz in a thickness direction, a difference DELTAn between a lengthwise and a widthwise refractive index, and th intrinsic viscosity of the polyester film. this base film is coated with magnetic paint obtained by adding a 30wt% binder of 5wt% urethane rubber, 3.5wt% nitrocellulose, 1.5wt% poly(vinyl chloride), and 90wt% methyl ethyl ketone to 70wt% gamma-Fe2O3 and a 15wt% setting agent of isocyanate compound to resin, thus obtaining a magnetic material coating original plate.
JP56045394A 1981-03-30 1981-03-30 Polyester film for magnetic recording tape Pending JPS57162126A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56045394A JPS57162126A (en) 1981-03-30 1981-03-30 Polyester film for magnetic recording tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56045394A JPS57162126A (en) 1981-03-30 1981-03-30 Polyester film for magnetic recording tape

Publications (1)

Publication Number Publication Date
JPS57162126A true JPS57162126A (en) 1982-10-05

Family

ID=12718041

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56045394A Pending JPS57162126A (en) 1981-03-30 1981-03-30 Polyester film for magnetic recording tape

Country Status (1)

Country Link
JP (1) JPS57162126A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645703A (en) * 1982-11-19 1987-02-24 Matsushita Electric Industrial Co., Ltd. Magnetic recording medium
JPS62164538A (en) * 1986-01-16 1987-07-21 帝人株式会社 Biaxial-oriented laminated polyester film
JPH01152032A (en) * 1987-12-09 1989-06-14 Diafoil Co Ltd Biaxially oriented 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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645703A (en) * 1982-11-19 1987-02-24 Matsushita Electric Industrial Co., Ltd. Magnetic recording medium
JPS62164538A (en) * 1986-01-16 1987-07-21 帝人株式会社 Biaxial-oriented laminated polyester film
JPH0411112B2 (en) * 1986-01-16 1992-02-27
JPH01152032A (en) * 1987-12-09 1989-06-14 Diafoil Co Ltd Biaxially oriented polyester film
JPH0513815B2 (en) * 1987-12-09 1993-02-23 Daia Hoiru Hekisuto Kk

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