JPS55101136A - Oriented polyester film for magnetic tape - Google Patents

Oriented polyester film for magnetic tape

Info

Publication number
JPS55101136A
JPS55101136A JP702179A JP702179A JPS55101136A JP S55101136 A JPS55101136 A JP S55101136A JP 702179 A JP702179 A JP 702179A JP 702179 A JP702179 A JP 702179A JP S55101136 A JPS55101136 A JP S55101136A
Authority
JP
Japan
Prior art keywords
less
inactive material
magnetic tape
polyester film
oriented polyester
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
JP702179A
Other languages
Japanese (ja)
Other versions
JPH026132B2 (en
Inventor
Shigeru Shiozaki
Takao Nakajo
Yukio Mitsuishi
Atsushi Yamamoto
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 JP702179A priority Critical patent/JPS55101136A/en
Publication of JPS55101136A publication Critical patent/JPS55101136A/en
Publication of JPH026132B2 publication Critical patent/JPH026132B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

PURPOSE: To improve resistance to wear, resistance to fatigue and running stability by combining inactive material particles of a specific combination and giving them to a specific refractive index range.
CONSTITUTION: Polyester including aluminium silicate of average particle diameter o.8μ or less and volume form coefficient 0.08 or less, calcium phosphate, inactive material (A) such as silica of 0.01W0.28wt%, sedimented calcium carbonate of average particle diameter 1.8μ or less and volume form coefficient 0.08 or more larger than inactive material (A), and inactive material (B) such as heavy calcium carbonate of 0.002W0.019wt% is biaxially orientated, and refractive indexes on two orthogonal axes are set to 1.65 or less and 1.667 or more respectively, thus obtaining a highly oriented polyester film for magnetic tape. Then, it is desirably that the film thickness is about 3W100μ (specially, 8W25μ).
COPYRIGHT: (C)1980,JPO&Japio
JP702179A 1979-01-26 1979-01-26 Oriented polyester film for magnetic tape Granted JPS55101136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP702179A JPS55101136A (en) 1979-01-26 1979-01-26 Oriented polyester film for magnetic tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP702179A JPS55101136A (en) 1979-01-26 1979-01-26 Oriented polyester film for magnetic tape

Publications (2)

Publication Number Publication Date
JPS55101136A true JPS55101136A (en) 1980-08-01
JPH026132B2 JPH026132B2 (en) 1990-02-07

Family

ID=11654375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP702179A Granted JPS55101136A (en) 1979-01-26 1979-01-26 Oriented polyester film for magnetic tape

Country Status (1)

Country Link
JP (1) JPS55101136A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968213A (en) * 1982-10-13 1984-04-18 Toray Ind Inc Biaxially stretched polyester film
JPS59133246A (en) * 1983-01-19 1984-07-31 Toyobo Co Ltd Orientated polyester film
JPS59179555A (en) * 1983-03-30 1984-10-12 Teijin Ltd Biaxially stretched polyester film
JPS6056531A (en) * 1983-09-09 1985-04-02 Toyobo Co Ltd Oriented polyester film
JPH01152032A (en) * 1987-12-09 1989-06-14 Diafoil Co Ltd Biaxially oriented polyester film
JPH01193327A (en) * 1988-01-28 1989-08-03 Toray Ind Inc Polyester film
US5006589A (en) * 1988-06-04 1991-04-09 Diafoil Company, Limited Polyester film for magnetic recording media

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968213A (en) * 1982-10-13 1984-04-18 Toray Ind Inc Biaxially stretched polyester film
JPS59133246A (en) * 1983-01-19 1984-07-31 Toyobo Co Ltd Orientated polyester film
JPS6354012B2 (en) * 1983-01-19 1988-10-26 Toyo Boseki Kk
JPS59179555A (en) * 1983-03-30 1984-10-12 Teijin Ltd Biaxially stretched polyester film
JPH0141170B2 (en) * 1983-03-30 1989-09-04 Teijin Ltd
JPS6056531A (en) * 1983-09-09 1985-04-02 Toyobo Co Ltd Oriented polyester film
JPS6347738B2 (en) * 1983-09-09 1988-09-26 Toyo Boseki Kk
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
JPH01193327A (en) * 1988-01-28 1989-08-03 Toray Ind Inc Polyester film
JPH0518328B2 (en) * 1988-01-28 1993-03-11 Toray Industries
US5006589A (en) * 1988-06-04 1991-04-09 Diafoil Company, Limited Polyester film for magnetic recording media

Also Published As

Publication number Publication date
JPH026132B2 (en) 1990-02-07

Similar Documents

Publication Publication Date Title
JPS5586103A (en) High density magnetic recording unit
JPS55101136A (en) Oriented polyester film for magnetic tape
JPS5534968A (en) Smooth-surface film
JPS56118734A (en) Adsorbing agent
JPS5712421A (en) Magnetic recording medium
JPS5545118A (en) Orientation polyester film for magnetic tape
EP0388086A3 (en) High opacity film
JPS5771556A (en) Magnetic tape having leader tape
JPS54118478A (en) Photochromic laminate
JPS55107495A (en) Stamping foil
JPS5764516A (en) Smothened polyester film
JPS556326A (en) Light isolator
JPS55164238A (en) Agricultural vinyl chloride resin film
JPS5724026A (en) Magnetic recording medium
JPS55151043A (en) Film for agriculture mainly made of olefinic resin
JPS55108926A (en) Oriented polyester film for magnetic tape
Gill et al. Phytosociological studies of epiphytic flora of oil palm(Elaeis guineensis Jacq.) in Benin City, Nigeria.
JPS55122235A (en) Magnetic disc coating film
JPS5711851A (en) Inorganic glass
JPS535490A (en) Conpound for grinding
JPS5365568A (en) Disc brake for floating caliper in combination with positive type andnegative type
JPS5528559A (en) Magnetic recording medium
JPS5629840A (en) Magnetic recording medium
JPS57147543A (en) Polyester film
JPS5669247A (en) Composite glass