| 摘要 |
PROBLEM TO BE SOLVED: To provide a copolymerized polyester having heat resistance, i.e., a glass transition temperature of 100°C or higher, being solved in a general-purpose solvent at a solution concentration of 25 mass% or higher and further having outstandingly sufficient storage stability. SOLUTION: The copolymerized polyester resin comprises dicarboxylic acid component (A) and glycol component (B), and in the copolymerized polyester resin, the copolymerization ratio of an aromatic dicarboxylic acid relative to the component (A) is 80 mol% or higher, the copolymerization ratio of tricyclodecane dimethanol relative to the component (B) is 20-80 mol%, a copolymerization ratio of isosorbide and/or bisphenoxy ethanol fluorene relative to the component (B) is 3-50 mol%, and the copolymerization ratio of a specific glycol relative to the component (B) is less than 20 mol%. The copolymerized polyester resin has a number average molecular weight of 8,000 or more and a glass transition temperature of 100°C or higher. COPYRIGHT: (C)2011,JPO&INPIT
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