Patent ID: 9605105
Date: 2017-03-28
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 containing, as a main component, one kind or two or more kinds selected from the group consisting of compounds represented by the following formulae (6) to (8), and a step for preparing the polymerizable composition for optical materials from the polythiol compound containing, as a main component, one kind or two or more kinds selected from the group consisting of compounds represented by the following formulae (6) to (8); wherein the step for preparing the polythiol compound containing, as a main component, one kind or two or more kinds selected from the group consisting of compounds represented by the following formulae (6) to (8) comprises: a step for reacting 2-mercaptoethanol with an epihalohydrin compound represented by the following formula (1) to obtain a compound represented by the following formula (3); (wherein X represents a halogen atom) a step for reacting the compound represented by formula (3) with sodium sulfide to obtain a polyalcohol compound represented by the following formula (4); a step for reacting the polyalcohol compound represented by formula (4) 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 20° C. to 60° C., aqueous ammonia to the reaction solution within 80 minutes, thereby hydrolyzing the isothiuronium salt to obtain a polythiol compound containing, as a main component, one kind or two or more kinds selected from the group consisting of compounds represented by the following formulae (6) to (8); and a step for adding hydrochloric acid which is concentration of 30% to 36% to the solution containing the polythiol compound thus obtained, washing the solution at a temperature of 30° C. to 55° C. to purify the polythiol compound containing, as a main component, one kind or two or more kinds selected from the group consisting of compounds represented by the formulae (6) to (8).