OPTICAL RESIN MATERIAL, OPTICAL PARTS, AND METHOD OF ASSESSING AMORPHOUS PROPERTY OF OPTICAL RESIN MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide an optical resin material having superior optical durability.;SOLUTION: An optical resin material of the present invention is obtained by chemically modifying hydroxyl groups of a polysaccharide extracted from an organism. The storage elastic modulus of the optical resin material of the present invention is measured using a viscoelastometer by setting a measurement lower limit temperature at the lower of 130°C or Tg of the resin material and a measurement upper limit temperature at a temperature at which the resin material exhibits fluidity and repeating one to five sets of measurement, inclusive, where one set of measurement is defined as measuring the storage elastic modulus of the resin material while changing the temperature of the resin material from a measurement start temperature, defined to be the measurement upper limit temperature, to the measurement lower temperature and then turning the temperature of the resin material back to the measurement start temperature. Each of the storage elastic modulus values repetitively measured at each temperature during the repetitive measurement by the viscoelastometer shall be less than twice the other values of storage elastic modus acquired at the same temperature during the repetitive measurement.;COPYRIGHT: (C)2015,JPO&INPIT