| 摘要 |
Provided is a method for producing a urethane-based plastic lens, wherein striae are not easily generated even by short-time polymerization. A method for producing a plastic lens, wherein a polymerization composition, which contains (A) a polyisocyanate compound, (B) a compound having a plurality of mercapto groups or hydroxy groups in each molecule and (C) a polymerization catalyst and which satisfies the conditions (1) and (2) described below, is polymerized under such polymerization conditions that the initial temperature is 20°C or less and the polymerization time is 12 hours or less. (1) The viscosity at 10°C right after the blending is 200 mPa.s or less. (2) The viscosity at 10°C after 8 hours under certain conditions is 400 mPa.s or more but 100 Pa.s or less. |
