Patent ID: 9637584
Date: 2017-05-02
CPC Classifications: C07C,C08G,G02B

Claim:
1. A method for producing a molded product, comprising: a step for preparing a polymerizable composition for optical materials and a step for curing the polymerizable composition for optical materials to produce the molded product; wherein the step for preparing the polymerizable composition for optical materials comprises a step for preparing a polythiol compound represented by the following formula (5), and a step for preparing the polymerizable composition for optical materials from the polythiol compound represented by the following formula (5); wherein the step for preparing the polythiol compound represented by the following formula (5) comprises: a step for reacting 2-mercaptoethanol with an epihalohydrin compound represented by the following formula (1) at a temperature of 10° C. to 50° C. to obtain a polyalcohol compound represented by the following formula (2); (wherein X represents a halogen atom) a step for reacting the polyalcohol compound represented by formula (2) thus obtained with thiourea in the presence of hydrogen chloride to obtain an isothiuronium salt; a step for adding, while maintaining a reaction solution containing the isothiuronium salt thus obtained at a temperature of 15° C. to 60° C., aqueous ammonia to the reaction solution within 80 minutes, thereby hydrolyzing the isothiuronium salt to obtain a polythiol compound represented by the following formula (5); and a step for adding hydrochloric acid which is a concentration of 25% to 36% to the solution containing the polythiol compound thus obtained, washing the solution at a temperature of 10° C. to 50° C. to purify the polythiol compound represented by the formula (5).