JPS63247913A - Polyester film for magnetic recording medium - Google Patents

Polyester film for magnetic recording medium

Info

Publication number
JPS63247913A
JPS63247913A JP62082481A JP8248187A JPS63247913A JP S63247913 A JPS63247913 A JP S63247913A JP 62082481 A JP62082481 A JP 62082481A JP 8248187 A JP8248187 A JP 8248187A JP S63247913 A JPS63247913 A JP S63247913A
Authority
JP
Japan
Prior art keywords
film
refractive index
recording medium
surface area
equations
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
JP62082481A
Other versions
JPH0752506B2 (en
Inventor
Masashi Inagaki
Chikakazu Kawaguchi
Yoshio Meguro
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 JP62082481A priority Critical patent/JPH0752506B2/en
Priority claimed from KR87006750A external-priority patent/KR960006092B1/en
Priority claimed from DE19873750319 external-priority patent/DE3750319D1/en
Publication of JPS63247913A publication Critical patent/JPS63247913A/en
Priority claimed from US07/420,740 external-priority patent/US4990400A/en
Publication of JPH0752506B2 publication Critical patent/JPH0752506B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To permit provision of excellent handling workability and wear resistance by forming a titled film in such a manner as to contain silica particles satisfying specific conditions at a specific ratio and to have specific values in the average refractive index of the film and the refractive index in the thickness direction thereof.
CONSTITUTION: The grain size distribution B, volumetric shape factor ϕV and specific surface area ratio R of the polyester film for a magnetic recording medium satisfy the equations IWIII. The film contains 0.01W3.0wt.% silica particles having 0.05W2μm average grain size. The average refractive index-n of the film and the refractive index nα in the thickness direction thereof satisfy the equations IV, V. In the equations, B and R are defined by B=(particle size when the integrated volume of the particles is 25%)/(particle size when the integrated volume of the particles is 75%), R=(the specific surface area value determined by a BET method)/(the specific surface area value in terms of equiv. sphere). The excellent handling workability and wear resistance as the base film for the magnetic recording medium for which high-density recording is required as well as the good electrical characteristics when the film is made into a magnetic tape are thereby obtd.
COPYRIGHT: (C)1988,JPO&Japio
JP62082481A 1987-04-03 1987-04-03 Polyester film for magnetic recording media Expired - Lifetime JPH0752506B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62082481A JPH0752506B2 (en) 1987-04-03 1987-04-03 Polyester film for magnetic recording media

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP62082481A JPH0752506B2 (en) 1987-04-03 1987-04-03 Polyester film for magnetic recording media
KR87006750A KR960006092B1 (en) 1986-08-29 1987-07-01 Polyester films, magnetic recording media & film capacitors produced therefrom
DE19873750319 DE3750319D1 (en) 1986-08-29 1987-08-24 Polyester compositions, processes for their production, polyester films, polyester films for magnetic tapes and films made therefrom for capacitors.
DE19873750319 DE3750319T2 (en) 1986-08-29 1987-08-24 Polyester compositions, processes for their production, polyester films, polyester films for magnetic tapes and films made therefrom for capacitors.
AT87112252T AT109493T (en) 1986-08-29 1987-08-24 Polyester compositions, method for their production, polyester films, polyester films for magnetic tapes and films made thereof for capacitors.
EP19870112252 EP0257611B1 (en) 1986-08-29 1987-08-24 Polyester compositions, process for preparing the same, polyester films, polyester films for magnetic recording media and films for capacitors produced therefrom
ES87112252T ES2056802T3 (en) 1986-08-29 1987-08-24 Polyester compositions, procedure for preparing them, polyester films, polyester films for magnetic recording media and films for capacitors produced from them.
US07/420,740 US4990400A (en) 1987-02-12 1989-10-12 Polyester films, magnetic recording media and film capacitors produced therefrom
US07/420,474 US5106681A (en) 1987-02-12 1989-10-12 Polyester films, magnetic recording media and film capacitors produced therefrom

Publications (2)

Publication Number Publication Date
JPS63247913A true JPS63247913A (en) 1988-10-14
JPH0752506B2 JPH0752506B2 (en) 1995-06-05

Family

ID=13775707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62082481A Expired - Lifetime JPH0752506B2 (en) 1987-04-03 1987-04-03 Polyester film for magnetic recording media

Country Status (1)

Country Link
JP (1) JPH0752506B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63168818A (en) * 1987-01-07 1988-07-12 Teijin Ltd Magnetic recording medium
JPS63220417A (en) * 1987-03-10 1988-09-13 Teijin Ltd Biaxially oriented polyester film for magnetic recording medium
JPH0324134A (en) * 1989-06-22 1991-02-01 Diafoil Co Ltd Polyester film for magnetic recording medium
JPH05131538A (en) * 1991-11-13 1993-05-28 Teijin Ltd Polyethylene-2, 6-naphthalate film

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823323A (en) * 1981-07-31 1983-02-12 Diafoil Co Ltd Polyester film for magnetic tape
JPS59171623A (en) * 1983-03-18 1984-09-28 Teijin Ltd Biaxially stretched polyester film
JPS615431A (en) * 1984-06-19 1986-01-11 Toray Ind Inc Polyester film for magnetic recording medium
JPS61154924A (en) * 1984-12-28 1986-07-14 Diafoil Co Ltd Polyester film for magnetic recording medium and manufacture thereof
JPS61167530A (en) * 1985-01-21 1986-07-29 Diafoil Co Ltd Polyester film for magnetic recording material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823323A (en) * 1981-07-31 1983-02-12 Diafoil Co Ltd Polyester film for magnetic tape
JPS59171623A (en) * 1983-03-18 1984-09-28 Teijin Ltd Biaxially stretched polyester film
JPS615431A (en) * 1984-06-19 1986-01-11 Toray Ind Inc Polyester film for magnetic recording medium
JPS61154924A (en) * 1984-12-28 1986-07-14 Diafoil Co Ltd Polyester film for magnetic recording medium and manufacture thereof
JPS61167530A (en) * 1985-01-21 1986-07-29 Diafoil Co Ltd Polyester film for magnetic recording material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63168818A (en) * 1987-01-07 1988-07-12 Teijin Ltd Magnetic recording medium
JPS63220417A (en) * 1987-03-10 1988-09-13 Teijin Ltd Biaxially oriented polyester film for magnetic recording medium
JPH0324134A (en) * 1989-06-22 1991-02-01 Diafoil Co Ltd Polyester film for magnetic recording medium
JPH05131538A (en) * 1991-11-13 1993-05-28 Teijin Ltd Polyethylene-2, 6-naphthalate film

Also Published As

Publication number Publication date
JPH0752506B2 (en) 1995-06-05

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