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Title:
MODIFIED POLYESTER AND FILM
Document Type and Number:
Japanese Patent JPH08104742
Kind Code:
A
Abstract:

PURPOSE: To improve the transparency, mechanical strengths, dimensional stability, and recovery from curling and inhibit the light piping phenomenon of a polyester film by copolymerizing a specific acid component with a specific diol component.

CONSTITUTION: An acid component comprising terephthalic acid, dimethyl terephthalate, naphthalene-2,6-dicarboxylic acid, dimethyl naphthalene-2,6- dicarboxylate, etc., is reacted with a diol component contg. 1-50mol% ester- forming deriv. having a fluorene, phenylindane, spiroglycol, or diphenyl sulfone group in the presence of a Ge compd. in an amt. 10-500ppm (in term of Ge) and at least one comtd. of a metal selected from among Ca, Mg, Ti, and Li in an amt. of 1-500ppm (in terms of metal) to give a modified polyester having a glass transition point (by differential scanning calorimetry) of 125°C or higher and a heat of crystallization (measured by decreasing temp.) of 4J/g or lower. The polyester is formed into sheet, stretched 2.0- to 5.0-fold in both longitudinal and transverse directions, and thermally treated, thus providing a film.


Inventors:
MORIMOTO TSUTOMU
SHIMIZU YUZO
SUZUKI MASARU
Application Number:
JP1994000242689
Publication Date:
April 23, 1996
Filing Date:
October 06, 1994
Export Citation:
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Assignee:
TORAY INDUSTRIES
International Classes:
C08J5/18; C08G63/181; C08G63/183; C08L67/00; C08L67/02; (IPC1-7): C08G63/183; C08J5/18; C08L67/02