PURPOSE: To prepare a polymer material having excellent heat resistance, optical characteristics and moldability and high glass transition temp. and providing a molded item having small optical strain, by hydrogeneting at least a part of olefinically unsatd. groups of a polycyclic norbornene ring opening copolymer.
CONSTITUTION: A part or the whole of olefinically unsatd. groups of a polycyclic norbornene ring-opening copolymer contg. 90W10mol% repeating units of formula I or its alkyl derivative, 10W90mol% repeating units of formula II (wherein symbol ... is a single bond or a double bond) or its alkyl derivative having an intrinsic viscosity η of 0.01W20dl/g measured at 25°C in toluene are hydrogenated with hydrogen by using a hydrogenation catalyst to prepare a hydrogenated product of polycyclic norbornene ring-opening copolymer wherein at least 50% of bonds of formula V constituting main chains of formulas III and IV are single bonds. It is applicable in an optical field as well as in other wide application fields.
OSHIMA MASAYOSHI
OBARA TEIJI
NATSUMI YOSHIO
| JPS6424826A | 1989-01-26 |