| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester resin excellent in transparency, heat stability and mechanical properties. SOLUTION: This polyester resin is obtained by polycondensing a glycol component, containing a spiroglycol of 5-60%, having a cyclic acetal skeleton given by structural formula (1), and ethylene glycol of 30-95 mol%, and a dicarboxylic acid component, containing terephthalic acid and/or it ester of 80-100 mol%, wherein this polyester resin has a specific limiting viscosity number, melt viscosity, molecular weight distribution, glass transition temperature and exothermic peak of crystallization in temperature-lowering.
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