| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyester polymer excellent in heat resistance, low water- absorption and optical characteristics, and further excellent in moldability. SOLUTION: This polyester polymer is obtained by condensing a diol component with a carboxylic acid component comprising at least one kind of tricyclo[5.2.1.02,6]decanedicarboxylic acids represented by formula (1) (wherein, two carboxyl groups are bonded to the carbon atoms constituting the tricyclo[5.2.1.02,6]decane ring; and the carbon atoms constituting the ring may have other substituents). The number average molecular weight of the polyester polymer is e.g. 1,000-150,000, preferably about 3,000-100,000.
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