Diisocyanate composition for optical lens and preparation method thereof

A technology of diisocyanate and xylylene diisocyanate, which is applied in the preparation of isocyanic acid derivatives, amino compounds, organic compounds, etc., can solve the problems of reduced yield, difficult application, high toxicity, etc., and achieve improved Yield effect

Active Publication Date: 2021-06-08
SKC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the amine was dissolved in aqueous hydrochloric acid, the yield was significantly reduced to 50%, making it difficult to apply in practice
There is the difficulty that amines with low water and impurity content should be used as raw materials in order to increase the purity of the final product
In addition, the phosgene gas used in the conventional phosgene process is highly toxic and a substance regulated by environmental regulations
Difficulties in storage and management as a separate cooling unit is required to store it

Method used

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  • Diisocyanate composition for optical lens and preparation method thereof
  • Diisocyanate composition for optical lens and preparation method thereof
  • Diisocyanate composition for optical lens and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1-1

[0186] Example 1-1: Preparation of diisocyanate composition

[0187] step 1)

[0188]1,009.4 g (9.46 mol) of an aqueous hydrochloric acid solution having a concentration of 35% by weight was charged into the reactor, and then the internal temperature of the reactor was lowered to 15° C. with stirring. While maintaining the temperature of the reactor at 60° C., 600.0 g (4.4 moles) of m-XDA were introduced for 1 hour. Here, the amount of aqueous hydrochloric acid introduced corresponds to 2.15 moles of HCl per 1 mole of m-XDA. After the introduction was completed, the internal temperature of the reactor was lowered to 10° C., and it was stirred for 1 hour. Thereafter, 1,320.0 g of tetrahydrofuran (THF) was introduced, and the internal temperature of the reactor was lowered to -5° C., followed by stirring for 1 hour. After the reaction, the diamine hydrochloride composition containing m-XDA·2HCl was separated by vacuum filtration using a filter, and the filtered tetrahydrofura...

example 2-1

[0215] Example 2-1: Preparation of diisocyanate composition

[0216] step 1)

[0217] 1,009.4 g (9.46 mol) of an aqueous hydrochloric acid solution having a concentration of 35% by weight was charged into the reactor, and then the internal temperature of the reactor was lowered to 15° C. with stirring. While maintaining the temperature of the reactor at 60° C., 600.0 g (4.4 moles) of m-XDA were introduced for 1 hour. Here, the amount of aqueous hydrochloric acid introduced corresponds to 2.15 moles of HCl per 1 mole of m-XDA. After the introduction was completed, the internal temperature of the reactor was lowered to 10° C., and it was stirred for 1 hour. Thereafter, 1,320.0 g of tetrahydrofuran (THF) was introduced, and the internal temperature of the reactor was lowered to -5° C., followed by stirring for 1 hour. After the reaction, the diamine hydrochloride composition containing m-XDA·2HCl was separated by vacuum filtration using a filter, and the filtered tetrahydrofur...

example 2-2 to 2-5 and comparative example 2-1 to 2-3

[0221] The procedure of step (1) of Example 2-1 was repeated, except that the amount of aqueous hydrochloric acid introduced was changed as shown in Table 3 below to obtain the diamine hydrochloride composition, and the procedure of step (2) according to Example 2-1 was obtained by Diamine Hydrochloride Compositions Diisocyanate compositions are prepared.

[0222] The pHs of the diamine hydrochloride compositions obtained in step (1) of Examples and Comparative Examples respectively when dissolved in water at a concentration of 10% by weight are summarized in Table 3 below.

[0223] [table 3]

[0224]

[0225] As can be seen from the table above, the pH of the diamine hydrochloride salt composition can be varied by adjusting the amount of aqueous hydrochloric acid introduced.

[0226] Preparation of Optical Lenses

[0227] The m- XDI composition, the dibutyl tin dichloride of 0.01 weight part and the phosphate ester release agent (ZELEC) of 0.1 weight part TM UN Stepan...

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Abstract

According to the invention, the pH of a diisocyanate composition and a diamine hydrochloride composition used in the preparation of an optical lens is adjusted to a specific range, whereby it is possible to enhance not only the yield and purity of the diisocyanate composition but also the optical characteristics of the final optical lens by suppressing the striae and cloudiness. Specifically, according to the process of the invention, the amount of an aqueous hydrochloric acid solution introduced to the reaction may be adjusted to control the pH of the diisocyanate composition to a desired range, thereby enhancing the yield and purity. Accordingly, the process for preparing a diisocyanate composition according to the invention can be applied to the preparation of a plastic optical lens of high quality.

Description

technical field [0001] Embodiments relate to a diisocyanate composition for optical lenses and a method for preparing the same. More specifically, the embodiments relate to a diisocyanate composition for producing an optical lens, a method for producing the diisocyanate composition, and a method for producing an optical lens using the same. Background technique [0002] Isocyanates used as raw materials for plastic optical lenses are produced by a phosgene method, a non-phosgene method, a pyrolysis method, and the like. [0003] In the phosgene method, amines are used as raw materials and phosgene (COCl 2 ) gas reaction to synthesize isocyanate. In addition, in the non-phosgene method, dibromomethylbenzene is reacted with sodium cyanate in the presence of a catalyst to synthesize isocyanate. In the pyrolysis method, an amine is reacted with an alkyl chloroformate to prepare a carbamate, which is pyrolyzed at high temperature in the presence of a catalyst to synthesize an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/38C07C263/10C07C265/14
CPCC07C263/10C08G18/7614C08G18/3225G02B1/04G02B1/041C07C265/14C07C209/00C08G75/00C08G18/7642C08G18/3876C08G18/242C08L75/04G02B1/043C08L81/02Y02P20/582C07C211/50C08L81/00C07C263/20
Inventor 裵栽荣金正武韩赫熙明正焕
Owner SKC CO LTD
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