MOLDING MATERIAL FOR PLASTIC LENSES

摘要

A molding material for plastic lenses containing a hydrogenated aromatic vinyl polymer, characterized in that the polymer has a percentage hydrogenation of the aromatic ring of not less than 97 % and a weight average molecular weight (Mw) of 50,000 to 500,000 with the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) being not more than 2.5; plastic lenses prepared by molding the molding material; a novel hydrogenated aromatic vinyl polymer suitable as the molding material; and a process for preparing the same.