| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester resin composition which has excellent dimensional stability and is also excellent in hydrolysis resistance when formed into a film or the like; and to provide a biaxially oriented film using the polyester resin composition. SOLUTION: The polyester resin composition includes a modifying agent consisting of a cyclic imino ether compound or a carbodiimide compound in an amount of 0.05-10 parts by mass based on 100 parts by mass of copolyester in which the total rate of dicarboxylic acid represented by following formula (I) or (II) is 90-100 mol% of dicarboxylic acid in total, a dicarboxylic acid constituent represented by following formula (I) is 5 mol% or more but less than 50 mol% of the dicarboxylic acid in total, and 90-100 mol% of the diol constituent in the total is a 2-10C alkylene glycol. Formula (I) is HO(O)C-R<SP>2</SP>-OR<SP>1</SP>O-R<SP>2</SP>-C(O)OH. [In the formula, R<SP>1</SP>represents a 2-10C alkylene group; and R<SP>2</SP>represents a 2,6-naphthalenediyl group]. Formula (II) is HO(O)C-R<SP>3</SP>-C(O)OH. [In the formula, R<SP>3</SP>represents a phenylene group or a naphthalenediyl group]. COPYRIGHT: (C)2010,JPO&INPIT
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