| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a copolymerized aromatic polyester having excellent dimensional stability, obtained by being copolymerized with 6,6'-(alkylenedioxy)di-2-naphthoic acid component, and containing no large particle aggregation; and to provide a biaxially stretched film using the same. <P>SOLUTION: A copolymerized aromatic polyester composition includes: an aromatic dicarboxylic acid component having ≥5 mol% and <80 mol% of 6,6'-(alkylenedioxy)di-2-naphthoic acid component, an alkylene glycol, and an inert particle having an average particle diameter of 0.01 to 0.5 μm, wherein the content of the inert particle is in the range of 0.01 to 5.0 mass% based on the mass of the copolymerized aromatic polyester composition; and the number of aggregates of the inert particle which cannot pass through a direct porous filter having a pore diameter of 8 μm is ≤100 aggregates/100 g based on the weight of the inert particle contained. <P>COPYRIGHT: (C)2012,JPO&INPIT |
