| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester resin having (1) a low dispersibility with an Abbe's number of >=40, (2) a high refractive index of >=1.58, (3) a heat resistance represented by a glass transition temperature of >=100 deg.C, (4) a transparency represented by a light transmittance of >=85% and (5) a melt-processibility. SOLUTION: The polyester resin has a unit of formula (1) [wherein R is represented by formula (2); and X1, X2 and X3 are each represented by formula (3)] in its main chain.
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