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Title:
BIAXIALLY ORIENTED POLYESTER FILM AND MAGNETIC RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2010/131643
Kind Code:
A1
Abstract:
Provided is a biaxially oriented polyester film which, when used particularly as the base film of a magnetic recording medium, can yield a high-density magnetic recording medium wherein the dimensional change caused by changes in the environmental factors such as temperature and humidity or by storage is prevented. Thus, the high-density magnetic recording medium achieves a low error rate, and rarely causes the abrasion of a magnetic head or a magnetic tape and therefore exhibits excellent durability in terms of traveling. A biaxially oriented polyester film that has a sea-island structure wherein the dispersed islands have an average diameter of 30 to 200nm, and that exhibits a humidity expansion coefficient of 0 to 6.0ppm/%RH or lower in the lengthwise and/or widthwise direction of the film.

Inventors:
MITSUOKA HIDETO (JP)
HIGASHIOJI TAKUJI (JP)
HORIE MASATO (JP)
NAKAMORI YUKARI (JP)
Application Number:
PCT/JP2010/057940
Publication Date:
November 18, 2010
Filing Date:
May 11, 2010
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
MITSUOKA HIDETO (JP)
HIGASHIOJI TAKUJI (JP)
HORIE MASATO (JP)
NAKAMORI YUKARI (JP)
International Classes:
C08J5/18; G11B5/73
Foreign References:
JP2004107471A2004-04-08
JP2003246870A2003-09-05
JP2004091753A2004-03-25
JP2005163020A2005-06-23
JP2001323146A2001-11-20
JP2004123863A2004-04-22
Other References:
POLYMER PROCESSING, vol. 15, no. 6, 2003, pages 382 - 385
JIS KI 7105, 1981
JIS K 7105, 1985
See also references of EP 2431406A4
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Claims:



 
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