Method for producing internal release agent for polythiourethane optical material, internal release agent for polythiourethane optical material, and polymerizable composition containing the same

摘要

The process for producing an internal mold release agent for an optical material of the present invention includes a step of heating, to a range of 80°C to 140°C, a composition including (a) a phosphoric ester compound, and (b) an alcohol compound containing an aliphatic alcohol having 1 to 10 carbon atoms and/or aromatic alcohol, when the total amount of (a) and (b) is 100% by weight, the alcohol compound (b) is included in an amount equal to or more than 2.5% by weight.