METHOD FOR PRODUCING PLASTIC LENS

摘要

Provided is a method for producing a plastic lens, which achieves excellent productivity and excellent transparency of a plastic lens produced thereby even in cases where a polyisocyanate monomer that is in a solid state at room temperature is used as a starting material monomer, and which enables mass production of the plastic lens. A method for producing a plastic lens, wherein a mixture that contains (A) a polyisocyanate monomer having a melting point that is not less than room temperature and (B) a monomer having a melting point that is less than room temperature among the starting material monomers that include at least a polyisocyanate monomer and a polythiol monomer is polymerized. This method for producing a plastic lens is characterized in that: the polyisocyanate monomer (A) is dissolved by mixing the polyisocyanate monomer (A) in a solid state with the monomer (B) in the above-mentioned step for preparing the mixture; and the mixing is carried out at a temperature that is lower than the melting point of the polyisocyanate monomer (A) but higher than the melting point of the monomer (B).