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Title:
BIAXALLY ORIENTED POLYESTER FILM
Document Type and Number:
Japanese Patent JP2005146162
Kind Code:
A
Abstract:

To provide a polyester film which has an excellent dimentional stability in all temperature/humidity regions of a low temperature with low humidity, low temperature with high humidity, high temperature with low humidity and high temperature with high humidity, and is useful for a high-density magnetic recording medium, in particular.

The biaxally oriented polyester film contains 80-99.9 wt.% polyester (polymer 1) and 0.1-5 wt.% polyimide (polymer 2), wherein the density is 1.39-1.41 g/cm3 and the refractive index is 1.65-1.75 in longitudinal and transverse directions and in all the directions of making 45° with both the directions.


Inventors:
KUBOTA HIROSHI
HORIE MASAHITO
TSUNEKAWA TETSUYA
Application Number:
JP2003387577A
Publication Date:
June 09, 2005
Filing Date:
November 18, 2003
Export Citation:
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Assignee:
TORAY INDUSTRIES
International Classes:
C08J5/18; B29C55/16; C08L67/02; (IPC1-7): C08J5/18; B29C55/16; C08L67/02
Domestic Patent References:
JP2000309650A2000-11-07
JP2001071649A2001-03-21



 
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