HYDROGENATED THERMOPLASTIC NORBORNENE POLYMER, PRODUCTION THEREOF, AND OPTICAL ELEMENT BASE, OPTICAL ELEMENT AND LENS MOLDED THEREFROM.

摘要

A hydrogenated thermoplastic norbornene polymer having excellent characteristics as an optical material is provided by reducing the amount of transition metal atoms originating in the polymerization catalyst used and remaining in the hydrogenate below 1 ppm. A desired reduction in the amount of remaining metal atoms is attained by treating the reaction mixture with an adsorbent in the course of or after the hydrogenation of the polymer. The hydrogenated polymer has a wide application field including the raw material of optical products having excellent characteristics, such as optical element bases and lenses.