Title:
二軸配向ポリエステルフィルム
Document Type and Number:
Japanese Patent JP4858818
Kind Code:
B2
Abstract:
A biaxially oriented polyester film wherein the microscopic Raman crystallization index Ic measured in the film thickness direction is in a range of 8 cm -1 to 15 cm -1 and the difference between the maximum value and the minimum value of Ic is 1 cm -1 or less. Another biaxially oriented polyester film wherein the relative power (I 10 TD ) of spatial frequency (1/mm) measured along the transverse direction of at least one surface of the polyester film having been heat treated at 100°C for 24 hours is in a range of -25 to 0 dB. These biaxially oriented polyester films are films good in microplanarity even after high-temperature storage or heat loading during processing. These biaxially oriented polyester films are useful as polyester films for use in a mag netic recording material, an electronic material, a stencil film, a sublimatic ribbon and a package material. In particular, these biaxially oriented polyester films are useful when employed as a base film for a high-density magnetic recording medium, especially, a double layer metal coated digital recording medium according to linear recording system.
Inventors:
Atsushi Kobayashi
Yasuo Nishigaki
Yasuo Nishigaki
Application Number:
JP2005518045A
Publication Date:
January 18, 2012
Filing Date:
February 17, 2005
Export Citation:
Assignee:
TORAY INDUSTRIES,INC.
International Classes:
C08J5/18; B29C55/12; B29D7/01; G11B5/73; B29K67/00
Domestic Patent References:
| JPH0668449A | 1994-03-11 | |||
| JPH05212788A | 1993-08-24 | |||
| JP2001058345A | 2001-03-06 | |||
| JPH11115043A | 1999-04-27 | |||
| JPH08281794A | 1996-10-29 | |||
| JPH11334014A | 1999-12-07 | |||
| JP2002254510A | 2002-09-11 | |||
| JPH08337664A | 1996-12-24 |
Foreign References:
| WO2001066336A1 | 2001-09-13 |
Attorney, Agent or Firm:
Toshimitsu Ban