Process for preparing ocular lens with urethane compound and process for preparing urethane compound for medical instruments

摘要

A process for preparing an ocular lens with a urethane compound comprising the steps ofa) preparing a urethane compound by reacting at least one hydroxyl compound and at least one isocyanate compound in the presence of an organic iron compound,b) removing the organic iron compound from the urethane compound obtained in the step a)c) mixing the urethane compound obtained in the step b) with at least one compound selected from the group consisting of another copolymerizable compound, a crosslinking agent, a UV absorbent, a dye, a polymerization initiator, a photosensitizer, and an organic solvent to obtain a mixture, andd) curing the mixture obtained in the step c) to prepare a lens.