Polymerization catalyst for polythiourethane optical material, polymerizable composition containing the same, polythiourethane resin obtained from the composition, and process for producing the resin

Abstract

By using an amine hydrochloride represented by the formula (1) as a catalyst, a polythiourethane resin which is suitably used for a transparent resin for optical use, can be obtained without using an organotin compound which has been conventionally used as a catalyst for polythiourethane resins and without being affected by the acidity of an additive: wherein R, Rand Rindependently represent a monovalent or higher valent linear aliphatic, branched aliphatic, cyclic aliphatic or aromatic organic residue which may have a hydroxyl group or an amino group; and R, Rand Rmay be arbitrarily bonded to each other to form a ring.