Method for preparing polythiol compound and polymeric composition for optical material comprising same

摘要

The present invention relates to novel methods for preparing a polythiol compound for use in an optical material and polymerizable compositions including a polythiol compound prepared by the methods. According to the methods, a polythiol compound with uniform color, high purity and high quality can be prepared at reduced cost. The polymerizable compositions can be used to manufacture clear, transparent optical lenses with good heat resistance and excellent optical properties.

主权项

1. A method for preparing a polythiol compound from epichlorohydrin as a starting material, the method comprising:
reacting epichlorohydrin with hydrogen sulfide to obtain bis(3-chloro-2-hydroxypropyl)sulfide; reacting a 2-mercaptoethanol salt with the bis(3-chloro-2-hydroxypropyl)sulfide to obtain a polyol compound; adding hydrochloric acid and thiourea to the polyol compound, stirring the mixture under heating, cooling the reaction mixture to room temperature, and adding a basic aqueous solution to the reaction mixture to hydrolyze the reaction product; and washing the hydrolysis product with water at room temperature, followed by concentration under reduced pressure.