| 摘要 |
To provide an aromatic polyester which is formed into a film having excellent heat resistance, color, mechanical properties, dimensional stability and gas barrier properties and a manufacturing process thereof;
the aromatic polyester comprises a dicabroxylic acid component and a diol component, wherein
(i) the dicarboxylic acid component contains 50 to 100 mol% of a recurring unit represented by the following formula (A):
wherein R is an alkylene group having 2 to 10 carbon atoms,
(ii) the aromatic polyester has an intrinsic viscosity measured at 35°C by using a mixed solvent of P-chlorophenol and 1,1,2,2-tetrachloroethane (weight ratio of 40/60) of 0.4 to 3.0;
(iii) the aromatic polyester has a content of a recurring unit represented by the following formula (D) of less than 10 mol%:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ-O-CH 2 CH 2 -O-CH 2 CH 2 -O-€ƒ€ƒ€ƒ€ƒ€ƒ(D)
(iv) the aromatic polyester has a terminal carboxyl group concentration of 200 eq/ton or less; and
(v) the aromatic polyester has an alkali metal content of 300 ppm or less. |
