CYCLOOLEFIN RESIN COMPOSITION, MOLDED BODY THEREOF AND MIRROR

摘要

PROBLEM TO BE SOLVED: To provide a cycloolefin resin composition that enables a molded body having a smaller thermal expansion property and a smooth surface, and the molded body thereof.

SOLUTION: A molded body is obtained by molding a cycloolefin resin composition. The cycloolefin resin composition at least contains a cycloolefin resin and silica microparticles. An average primary particle diameter of the silica microparticles is 10 nm or more and maximum 150 nm or less. The cycloolefin resin composition contains 15 wt.% or more and 70 wt.% ore less of the silica microparticles. A linear expansion coefficient of the molded body at a temperature from 0°C to 80°C is 50×10-6/°C or smaller.

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