Method for preparing polythiol compound and polymeric composition for optical material comprising same
AssigneeKoc Solution Co., Ltd.
InventorsDong Gyu Jang, Soo Gyun Roh, Jong Hyo Kim
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Abstract
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.
Claims12
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.
A method for preparing a polymerizable composition for optical materials, the method comprising the steps of:
- (a) 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;
- 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 to obtain a polythiol compound,
- (b) adding a polyisocyanate compound to the polythiol compound obtained in step (a).
A method for preparing an optical material comprising the steps of:
- (a) 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 to obtain a polythiol compound,
- (b) adding a polyisocyanate compound to the polythiol compound obtained in step (a) to obtain a polymerizable composition for optical materials,
- (c) cast polymerizing the polymerizable composition obtained in step (b) to obtain an optical material.
A method for preparing a polythiol compound from epichlorohydrin as a starting material, the method comprising:
- reacting epichlorohydrin with hydrogen sulfide in the presence of a catalyst to obtain bis(3-chloro-2-hydroxypropyl)sulfide;
- adding an aqueous solution of sodium hydroxide to the bis(3-chloro-2-hydroxypropyl)sulfide to obtain an epoxy compound,
- adding 2-mercaptoethanol and a catalyst to the epoxy compound 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.
A method for preparing a polymerizable composition for optical materials, the method comprising the steps of:
- (a) reacting epichlorohydrin with hydrogen sulfide to obtain bis(3-chloro-2-hydroxypropyl)sulfide;
- adding an aqueous solution of sodium hydroxide to the bis(3-chloro-2-hydroxypropyl)sulfide to obtain an epoxy compound;
- adding 2-mercaptoethanol and a catalyst to the epoxy compound 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 to obtain a polythiol compound;
- (b) adding a polyisocyanate compound to the polythiol compound obtained in step (a).
A method for preparing an optical material, the method comprising the steps of:
- (a) reacting epichlorohydrin with hydrogen sulfide to obtain bis(3-chloro-2-hydroxypropyl)sulfide;
- adding an aqueous solution of sodium hydroxide to the bis(3-chloro-2-hydroxypropyl)sulfide to obtain an epoxy compound;
- adding 2-mercaptoethanol and a catalyst to the epoxy compound 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 to obtain a polythiol compound;
- (b) adding a polyisocyanate compound to the polythiol compound obtained in step (a);
- (c) cast polymerizing the polymerizable composition obtained in step (b) to obtain an optical material.
Dependencies are inferred from the claim text.