| abstract |
To provide a polyester resin particularly useful in application to optical films, etc. n A polyester resin which is an alicyclic polyester comprising dicarboxylic acid units and diol units, characterized by the following (1) to (4):n (1) the dicarboxylic acid units are composed mainly of 1,4-cyclohexanedicarboxylic acid units, (2) the diol units are composed mainly of 1,4-cyclohexanedimethanol units, (3) the ratio of alkyl ester terminals to all terminals of the polyester is at most 5 mol %, and (4) the light transmittance of a molded plate of the resin having a thickness of 2 mm is at least 87%. |