Method for producing polythiol compound for optical materials and composition comprising same for optical materials

A technology of optical materials and manufacturing methods, applied in the fields of mercaptan preparation, optics, sulfide preparation, etc., can solve the problems of resin hue difference and achieve the effect of good hue and low yellowness

Active Publication Date: 2014-09-24
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the polythiol compound used for polymerization is colored, there will be a problem that the color of the resin produced will be different

Method used

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  • Method for producing polythiol compound for optical materials and composition comprising same for optical materials

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Synthesis of 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane

[0038] 676 g (8.65 mol) of 2-mercaptoethanol with a purity of 99.9% or higher and 340 g of water were placed in a 10-liter, 5-zone reaction flask equipped with a stirrer, an exchange cooling water separator, a nitrogen purge (purge) tube and a thermometer. At 30°C, 691.2 g (1.08 mol) of a 25% by weight aqueous sodium hydroxide solution was added dropwise over 30 minutes, and then 399.6 g (4.32 mol) of epichlorohydrin was added dropwise over 3 hours at the same temperature, and left for 1 hour. . The purity of the used epichlorohydrin is 99.9% or more, and its content is composed of acrolein (acrolein), allyl chloride (acrolein), 1,2-dichloropropane, 2,3-dichloropropene, 2-methyl group -2-pentanol, 2-chloroaryl alcohol, cis-1,3-dichloropropene, trans-1,3-dichloropropene, 1,3-dichloroisopropanol, 1,2,3 - The total content of impurities composed of trichloropropane and 2,3-dichloropropanol (hereinafter ref...

Embodiment 2

[0042] Except that the total content of specific impurities contained in the epichlorohydrin used was 0.05% by weight, it was the same as Example 1, and the same method as Example 1 was used to manufacture 1,2-bis[(2-mercaptoethyl thio]-3-mercaptopropane-based polythiol. The obtained polythiol mainly composed of 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane had an APHA of 8 and a YI value of 0.81. Using this polythiol, a plastic lens was produced in the same manner as in Example 1 and evaluated. The evaluation results are shown in Table 1.

Embodiment 3

[0044] Except that the total content of specific impurities contained in the epichlorohydrin used was 0.01% by weight, it was the same as Example 1, and the same method as Example 1 was used to manufacture 1,2-bis[(2-mercaptoethyl thio]-3-mercaptopropane-based polythiol. The obtained polythiol mainly composed of 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane had an APHA of 11 and a YI value of 0.92. Using this polythiol, a plastic lens was produced in the same manner as in Example 1 and evaluated. The evaluation results are shown in Table 1.

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Abstract

The present invention relates to a polythiol compound for optical materials exhibiting desirable characteristics from a coloring perspective, a composition comprising same for optical materials, and a method for producing optical materials. The present invention provides a method for producing a polythiol compound for optical materials which reacts epichlorohydrin compound having total impurities content of less than 0.5 wt% and 2-Mercaptoethanol. The present invention allows obtaining a polythiol compound exhibiting suppressed coloration, and by using same, allows obtaining a urethane group exhibiting suppressed coloration, low yellowness and good coloring. The polythiol compound according to the present invention can be used in the production of a variety of optical materials such as a urethane group, and optical lenses having good coloring, obtained by means of the present invention, can replace existing lenses and be widely used in diverse fields, particularly as lenses for glasses, polarized lights and cameras.

Description

technical field [0001] The present invention relates to a method for producing a polythiol compound for optical materials and a composition for optical materials including the polythiol compound, and in particular to a high-quality polythiol compound for optical materials having better physical properties in hue. And the composition for optical materials and the manufacturing method of an optical material containing this. Background technique [0002] Compared with optical materials composed of inorganic materials, plastic optical materials used for optical lenses such as eyeglasses are lightweight, non-breakable, and can be dyed. At present, a variety of resin and plastic materials are used as optical materials, and the requirements for the physical properties of these materials are getting higher and higher. [0003] Korean Patent Nos. 1993-0006918 and 1992-0005708 disclose a thiourethane lens obtained by reacting a polythiol compound and a polyisocyanate compound. Polyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C319/02C07C321/04G02B3/00C08G18/52
CPCC08G18/74G02B3/00C07C319/14C08G18/73C08G18/75C08G18/7642C08G18/3876G02B5/223C08G18/755C07C319/02C08G18/52G02B1/04C07C321/14C08L75/04C08L81/00C08G65/24
Inventor 张东奎卢守均金钟孝
Owner MITSUI CHEM INC
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