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JPS563430A - Biaxially oriented polyester film for magnetic tape - Google Patents

Biaxially oriented polyester film for magnetic tape

Info

Publication number
JPS563430A
JPS563430A JP7789679A JP7789679A JPS563430A JP S563430 A JPS563430 A JP S563430A JP 7789679 A JP7789679 A JP 7789679A JP 7789679 A JP7789679 A JP 7789679A JP S563430 A JPS563430 A JP S563430A
Authority
JP
Japan
Prior art keywords
valent
polyester
magnetic tape
film
compound
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
JP7789679A
Other languages
Japanese (ja)
Other versions
JPS6131526B2 (en
Inventor
Seiji Sakamoto
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.)
Diafoil Co Ltd
Original Assignee
Diafoil 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 Diafoil Co Ltd filed Critical Diafoil Co Ltd
Priority to JP7789679A priority Critical patent/JPS563430A/en
Publication of JPS563430A publication Critical patent/JPS563430A/en
Publication of JPS6131526B2 publication Critical patent/JPS6131526B2/ja
Granted legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To enhance the transit properties, the resistance to wear the electromagnetic conversion properites and the like, by securing the ball-type eduction particles independent to each other on the film surface to eliminate the gap between the particles and the polyester and then setting the number of the secondary and the third interference fringes due to the multiple interference method within the specific range per mm2.
CONSTITUTION: For manufacture of the polyester, the Ca salt soluble to the reaction group is used for the ester exchange reaction catalyst before or under ester exchange reaction and in the amount of about 0.05W0.3mol to the material acid component. Then the 3-valent P/5-valent P compound of the 3-valent and 5-valent P compound each is used in the mol ratio of 1W20, and the P compound is used in 1-W3-fold mol to the using Ca salt before the condensation polymerisation reaction. Thus the polyester is produced. Using such polyester, the biaxially oriented magnetic tape film is obtained. The particles educed into the obtained film contain Ca and P in 1W 15wt% each, and the secondary and the third interference fringes obtained by the multiple interference mathod is set to 30W300pcs./mm2 and 15pcs./mm2 or less respectively. As a result, the occurrence of the white powder can be reduced along with the reduced dropout. Thus the magnetic tape which has substantially no properties difference of the width directions of the film can be obtained.
COPYRIGHT: (C)1981,JPO&Japio
JP7789679A 1979-06-20 1979-06-20 Biaxially oriented polyester film for magnetic tape Granted JPS563430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7789679A JPS563430A (en) 1979-06-20 1979-06-20 Biaxially oriented polyester film for magnetic tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7789679A JPS563430A (en) 1979-06-20 1979-06-20 Biaxially oriented polyester film for magnetic tape

Publications (2)

Publication Number Publication Date
JPS563430A true JPS563430A (en) 1981-01-14
JPS6131526B2 JPS6131526B2 (en) 1986-07-21

Family

ID=13646833

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7789679A Granted JPS563430A (en) 1979-06-20 1979-06-20 Biaxially oriented polyester film for magnetic tape

Country Status (1)

Country Link
JP (1) JPS563430A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131428A (en) * 1983-01-17 1984-07-28 Toyobo Co Ltd Oriented polyester film improved in running characteristics
JPS59203232A (en) * 1983-05-02 1984-11-17 Diafoil Co Ltd Polyester film for magnetic recording medium
JPS6098524A (en) * 1983-11-04 1985-06-01 Diafoil Co Ltd Polyester film for magnetic tape
JPS60219627A (en) * 1984-04-17 1985-11-02 Fuji Photo Film Co Ltd Magnetic recording medium
US4617164A (en) * 1983-01-18 1986-10-14 Diafoil Company, Limited Process for stretching polyester films
JPS62143938A (en) * 1985-12-17 1987-06-27 Diafoil Co Ltd Polyethylene-2,6-naphthalate film for high-density magnetic recording medium
JPS6381022A (en) * 1986-09-25 1988-04-11 Teijin Ltd Biaxially oriented polyester film
US4840830A (en) * 1983-05-02 1989-06-20 Diafoil Company, Limited Polyester film for magnetic recording tape

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131428A (en) * 1983-01-17 1984-07-28 Toyobo Co Ltd Oriented polyester film improved in running characteristics
JPH039854B2 (en) * 1983-01-17 1991-02-12 Toyo Boseki
US4617164A (en) * 1983-01-18 1986-10-14 Diafoil Company, Limited Process for stretching polyester films
US4840830A (en) * 1983-05-02 1989-06-20 Diafoil Company, Limited Polyester film for magnetic recording tape
JPS59203232A (en) * 1983-05-02 1984-11-17 Diafoil Co Ltd Polyester film for magnetic recording medium
JPH0432730B2 (en) * 1983-05-02 1992-06-01 Daiafoil
JPS6098524A (en) * 1983-11-04 1985-06-01 Diafoil Co Ltd Polyester film for magnetic tape
JPS60219627A (en) * 1984-04-17 1985-11-02 Fuji Photo Film Co Ltd Magnetic recording medium
JPH0547894B2 (en) * 1984-04-17 1993-07-20 Fuji Photo Film Co Ltd
US4876137A (en) * 1985-12-17 1989-10-24 Diafoil Company, Limited Polyethylene naphthalate film for high-density magnetic recording media of floppy disk
JPS62143938A (en) * 1985-12-17 1987-06-27 Diafoil Co Ltd Polyethylene-2,6-naphthalate film for high-density magnetic recording medium
JPH0625267B2 (en) * 1985-12-17 1994-04-06 ダイアホイルヘキスト株式会社 Polyethylene-2,6-naphthalate film for high density magnetic recording media
JPS6381022A (en) * 1986-09-25 1988-04-11 Teijin Ltd Biaxially oriented polyester film
JPH0455583B2 (en) * 1986-09-25 1992-09-03 Teijin Ltd

Also Published As

Publication number Publication date
JPS6131526B2 (en) 1986-07-21

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