POLYESTER, COMPOSITION THEREOF AND FILM THEREOF

摘要

An object of the present invention is to provide a polyester film having excellent dimensional stability to temperature and humidity. The present invention is a polyester containing a dicarboxylic acid component and a diol component, wherein
(i) the dicarboxylic acid component contains not less than 5 mol% and less than 50 mol% of a recurring unit represented by the following formula (A) and more than 50 mol% and not more than 95 mol% of a recurring unit represented by the following formula (B):
wherein R A is an alkylene group having 2 to 10 carbon atoms,
wherein R B is a phenylene group or naphthalenediyl group; and
(ii) the diol component contains 90 to 100 mol% of a recurring unit represented by the following formula (C):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ-O-R C -O-€ƒ€ƒ€ƒ€ƒ€ƒ(C)
wherein R C is an alkylene group having 2 to 10 carbon atoms, and a film comprising the same.