| abstract |
The present invention relates to a process for thenproduction of a polyurethane lens, which comprisesn the step (a) of providing a polyisocyanatencompound and two or more polythiol compounds which havendifferent reaction rates with the polyisocyanate compoundnand adding an alkyltin halide compound to the abovenpolyisocyanate compound, and, after the step (a), the step (b) of mixing the polyisocyanate compoundnand the two or more polythiol compounds together with thenalkyltin halide compound of the general formula (I) to allownthem to react, and obtaining a polyurethane lens. |