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Patent Searching and Data


Title:
BIAXIALLY ORIENTED POLYESTER FILM
Document Type and Number:
Japanese Patent JPH0657018
Kind Code:
A
Abstract:

PURPOSE: To provide a biaxially oriented polyester film which comprises a specific polyester containing ester-forming polyfunctional compounds and is particularly suitable for magnetic tape application because of its high strength, elasticity, high productivity with low costs.

CONSTITUTION: A polyester containing an aromatic dicarboxylic acid, suitably terephthalic acid and a glycol, suitably ethylene glycol as the major constituents, and 0.035 to 3mole%, preferably 0.1 to 2mole% of a compound bearing 3 or more ester-forming functional groups, suitably trimellitic acid, trimesic acid or trimethylolpropane, and having 0.64 to 1.1, preferably 0.66 to 1 intrinsic viscosity is formed into a film, then subjected to simultaneous or sequential biaxial orientation at a draw ratio of 2.5 to 6, preferably 3 to 5, and when needed, heat-treated, to give the high-strength and highelasticity biaxially oriented polyester film of over 410kg/mm2, preferably more than 420kg/mm2, more preferably more than 430kg/mm2 Young modulus.


Inventors:
KAGAMI NOBUYUKI
SHIMIZU YUZO
SUZUKI MASARU
Application Number:
JP13246592A
Publication Date:
March 01, 1994
Filing Date:
May 25, 1992
Export Citation:
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Assignee:
TORAY INDUSTRIES
International Classes:
B29C55/12; C08J5/18; B29K67/00; B29L7/00; (IPC1-7): C08J5/18; B29C55/12