JPS55101136A - Oriented polyester film for magnetic tape - Google Patents
Oriented polyester film for magnetic tapeInfo
- 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
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
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)
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 |
-
1979
- 1979-01-26 JP JP702179A patent/JPS55101136A/en active Granted
Cited By (12)
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 |