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):
—O—R
C
—O— (C)
wherein R
C
is an alkylene group having 2 to 10 carbon atoms, and a film comprising the same.
本发明的目的在于提供一种聚酯薄膜,其具有优异的温湿度稳定性。本发明涉及一种聚酯,包含二
羧酸组分和二元醇组分,其中(i) 二
羧酸组分含有不少于5摩尔%且少于50摩尔%的由以下式(A)表示的重复单元和不少于50摩尔%且不多于95摩尔%的由以下式(B)表示的重复单元:其中RA是具有2至10个碳原子的烷基;其中RB是苯撑基或
萘二基基团;以及(ii) 二元醇组分含有90至100摩尔%的由以下式(C)表示的重复单元:—O—RC—O—(C)其中RC是具有2至10个碳原子的烷基,以及由此制成的薄膜。