| 摘要 |
PURPOSE:To obtain a plastic lens having a high refractive index, superior workability, heat resistance, dyeability, shock resistance an solvent resistance without deteriorating various characteristics of diethylene glycol bisallyl carbonate by copolymerizing a liq. mixture contg. one or more kinds of monomers selected among diallyl phthalate and derivs. thereof and diethylene glycol bisallyl carbonate in a specified ratio in the presence of a radical polymn. initiator. CONSTITUTION:The preferred amount of one or more kinds of monomers selected among diallyl phthalate and derivs. thereof represented by formula I (where X is halogen except fluorine, and a is an integer of 0-4) is 60-80wt% of the amount of diethylene glycol bisallyl carbonate. In case of >80wt%, satisfactory shock resistance is not necessarily provided to the resulting copolymer, so safety required by the material of spectacle lenses can not be well satisfied. In case of <60wt%, well satisfactory characteristics are provided, yet the refractive index is reduced. |
