JP2023159845A - Polythiol composition and use thereof - Google Patents

Abstract

To provide a polythiol composition that can improve the properties of an optical material produced therefrom, particularly that can increase the softening temperature of the material, leading to improved impact resistance.SOLUTION: A polythiol composition comprises a thiol compound represented by formula (1) and 2,3-dithio(2-mercapto)-1-propane thiol, wherein the mass content of the compound represented by formula (1) in the composition is 0.01-3.0%. Furthermore, the polythiol composition may be used alone or mixed with other polythiol compounds in the presence of a catalyst with one or more polyisocyanates, for preparing an optically transparent material with excellent optical properties.SELECTED DRAWING: None

Description

The present invention relates to the technical field of optical resins, and particularly to polythiol compositions and their applications.

Plastic materials are lightweight, strong, and easy to dye, so they have been widely used in the production of various optical materials in recent years. Glasses and lenses are required to have low specific gravity, high transparency, low yellowness, high heat resistance, high strength, high refractive index, and high Abbe number. A high refractive index allows the lens to be made thin, and a high Abbe number allows the lens to reduce chromatic aberration.

Polythiocarbon-based optical resin materials with such excellent properties have been an important development direction in recent years, and this type of resin materials are mainly made from polythiol compounds and isocyanate or episulfide compounds.

However, resin materials obtained from compositions for optical materials containing this compound have a low softening temperature and low impact resistance, making lenses soft in optical applications, affecting dyeing, and reducing the yield of lenses obtained. There is a problem of lowering the temperature, which increases the production cost. Needs improvement.

The present inventors have conducted studies in view of the current situation, and provide a polythiol composition for the purpose of solving the drawbacks of the prior art. The thiol composition provided by the present invention is based on conventional thiol compounds, and in particular contains or is present alone, 2,3-dithio(2-mercapto)-1-propanethiol, which is a compound of formula (2). In this case, by controlling the content of the compound of formula (1) within a certain range, the softening temperature and impact resistance of the resin material can be significantly improved.

The technical solution of the present invention includes the following.
First, the present invention provides a polythiol composition containing a compound of formula (1) and a compound of formula (2).

Preferably, the mass content of the compound of formula (1) in the composition is between 0.01 and 3.0%, more preferably between 0.1 and 1.0%.
Among these, regarding the production of the compound represented by formula (1), reference can be made to the patent application KR1020100119601A of Bigen Shoji Co., Ltd.

The present invention further provides a composition for optical materials based on the polythiol composition and containing the polythiol composition and polyisocyanate. This composition may also contain other polythiol compounds.

The polyisocyanate includes tetramethylene diisocyanate, hexamethylene diisocyanate, cyclohexane diisocyanate, 4,4'-diisocyanate dicyclohexylmethane, isophorone diisocyanate, norbornane diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, m-phenylene bis(dimethylmethylene) diisocyanate. , dithiodipropyl diisocyanate, dithiodiethyl diisocyanate, 2,5-diisocyanatomethylthiophene, 2,5-diisocyanatomethyl-1,4-dithiane, 2,5-diisocyanato-1,4-dithiane, thiodihexyl diisocyanate , thiodipropyl diisocyanate, bis(isocyanatomethyl)adamantane, bis(isocyanatomethyl)tetrahydrothiophene, 2,6-bis(isocyanatomethyl)naphthalene, 1,5-naphthalene diisocyanate, diethylene diisocyanate, trimethylhexamethylene diisocyanate, One or more types selected from lysine triisocyanate, toluene diisocyanate, o-tolidine diisocyanate, diphenylmethane diisocyanate, diphenyl ether diisocyanate, and triphenylmethane triisocyanate. Preferably, it is one or more selected from hexamethylene diisocyanate, isophorone diisocyanate, norbornane diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, m-xylylene diisocyanate, and hydrogenated m-xylylene diisocyanate. More preferably, it is one selected from hydrogenated m-xylylene diisocyanate, norbornane diisocyanate, and m-xylylene diisocyanate.

In the composition for optical materials, the other polythiol compounds include 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1, 11-dimercapto-3,6,9-trithi undecane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithi undecane, methanedithiol, methane trithiol, bis(2-mercapto ethyl) ether, tetrakis(mercaptomethyl)methane, 1,2-dimercaptopropane, 1,3-dimercaptopropane, 1,4-dimercaptobutane, 1,6-dimercaptohexane, 2,2-dimercaptopropane , 1,2-bis(2-mercaptoethoxy)ethane, 1,2-bis(2-mercaptoethylthio)ethane, 2,3-dimercapto-1-propanol, 1,2-dimercaptoethane, 1,3- Dimercapto-2-propanol, 2-mercaptomethyl-1,3-dimercaptopropane, 2-mercaptomethyl-1,4-dimercaptobutane, 1,2,3-trimercaptopropane, 2-(2-mercaptoethylthio) )-1,3-dimercaptopropane, 2,4-dimercaptomethyl-1,5-dimercapto-3-thiapentane, bis(2-mercaptoethyl) sulfide, ethylene glycol bis(3-mercaptopropionate), diethylene glycol Bis(2-mercaptoacetate), ethylene glycol bis(2-mercaptoacetate), 1,4-butanediol bis(2-mercaptoacetate), trimethylolpropane trimercaptopropionate, pentaerythritol tetramercaptoacetate, diethylene glycol bis(2-mercaptoacetate), 3-mercaptopropionate), pentaerythritol tetramercaptopropionate, 1,2-dimercaptocyclohexane, 1,1,1-tris(mercaptomethyl)propane, 1,4-butanediol bis(3-mercaptopropionate) 1,3-dimercaptocyclohexane, trimethylolpropane trimercaptoacetate, 1,4-dimercaptocyclohexane, 1,3-bis(mercaptomethyl)cyclohexane, 1,4-bis(mercaptomethyl)cyclohexane, bis( 4-Mercaptophenyl) sulfone, 2,5-dimercaptomethyl-1,4-dithiane, 2,5-bis(2-mercaptoethylthiomethyl))-1,4-dithiane, 2,5-dimercaptomethyl- 1-thiane, 2,5-dimercaptoethyl-1-thiane, 2,5-dimercaptomethylthiophene, bis(4-mercaptophenyl) sulfide, 1,2-dimercaptobenzene, 1,3-dimercaptobenzene, 1,4-dimercaptobenzene, 1,3-bis(mercaptomethyl)benzene, 2,5-dimercaptomethyl-1,4-dithiane, 1,4-bis(mercaptomethyl)benzene, 2,2'-dithiane Mercaptobiphenyl, bis(4-mercaptophenyl)methane, 2,2-bis(4-mercaptophenyl)propane, 4,4'-dimercaptobiphenyl, bis(4-mercaptophenyl)ether, bis(4-mercaptomethylphenyl) ) methane, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 2,2-bis(4-mercaptomethylphenyl)propane, bis(4-mercaptomethylphenyl)ether, bis(4-mercaptomethylphenyl) One or more selected from sulfide, 2,5-dimercapto-1,3,4-thiadiazole, and 3,4-thiophenedithiol.

A method for producing an optical material, which comprises adding a catalyst in an amount of 0.001% to 0.2% based on the total mass of the optical material composition to the optical material composition, and polymerizing and curing the mixture.

The catalyst is selected from dibutyltin dilaurate, dibutyltin dichloride, dibutyltin oxide and stannous octoate, preferably dibutyltin dilaurate and dibutyltin dichloride.

In the method for producing an optical material, in addition to adding a catalyst, a mold release agent, an ultraviolet absorber, a toning agent, a mold release agent, etc. can be added as necessary to further improve the performance of the optical material.

As described above, the present invention involves preparing a polythiol composition and preparing an optical material using this composition. By adjusting the mass content of the thiol compound represented by formula (1), the properties of the produced optical material can be improved, and in particular, the softening temperature of the material can be increased, and the impact resistance can be improved. It can be improved.

The invention will be further described below in conjunction with specific embodiments, which will enable those skilled in the art to further understand the invention, but are not intended to limit the scope of the invention. All techniques based on the principles described in this invention fall within the scope of this invention.

Softening temperature: Measured using a DSC-3 differential scanning calorimeter, and the heating rate was 10° C./min.
Impact strength: A material with a center thickness of 2.0 mm and a constant curvature is fixed to the device with the convex side facing up. Steel balls with masses of 16 g, 32 g, 64 g, 90 g, and 110 g are selected and dropped from a height of 1.27 m to the center of the material surface in order of mass from smallest to largest. Measurement is carried out three times using small balls of each mass to detect the presence or absence of cracks on the material surface, and the mass of the largest steel ball with no cracks on the material surface is taken as the impact strength. For example, if a steel ball of 90 g is collided three times without breaking, but a steel ball of 110 g is collided with it and breaks, the impact strength of this material will be 90 g.
Curing temperature increase program: Maintain at 30°C for 180 minutes, raise the temperature to 45°C after 120 minutes, raise the temperature to 50°C after 90 minutes, raise the temperature to 60°C after 120 minutes, raise the temperature to 120°C after 240 minutes, this temperature The temperature was maintained for 240 minutes, and after 120 minutes it was cooled to 70°C.
Secondary curing temperature increase program: After 120 minutes, the temperature was raised from 30°C to 120°C, held for 120 minutes, and then cooled to 70°C after 60 minutes.

(Example 1)
Add 49.8 parts by mass of hydrogenated xylylene diisocyanate to a flask, add 0.10 parts by mass of catalyst (dibutyltin dichloride) and 0.10 parts by mass of mold release agent (polyphosphate), and under the conditions of 10 to 30°C. Stir to dissolve. 30.2 parts by mass of the polythiol composition and 20.0 parts by mass of pentaerythritol tetramercaptopropionate are added and stirred uniformly. A mixed solution was prepared by degassing using a vacuum pump, controlling the absolute pressure to 350 Pa or less, and setting the degassing time to 0.5 to 1.0 hours. Thereafter, the prepared mixed solution is poured into a mold with a diameter of 80 mm and a center thickness of 2.0 mm, placed in an oven and cured at elevated temperature, and after curing is removed from the mold to obtain an optical material.

The polythiol composition is composed of a compound of formula (1) and a compound of formula (2), and contains 0.01% by mass of the compound of formula (1). The polythiol composition may further contain trace amounts of extraneous impurities.

(Examples 2 to 10)
The polythiol composition of Example 1 was changed to the following.
polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 0.05%);
polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 0.1%);
polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 0.3%);
polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 0.5%);
polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 0.8%);
Polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 1.0%);
polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 1.5%);
polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 2.0%);
Polythiol composition (consisting of compounds of formula (1) and formula (2), the mass content of the compound of formula (1) in the composition is 3.0%);
The optical materials of Examples 2 to 10 were produced without changing other conditions.

(Comparative example 1)
The polythiol composition of Example 1 was changed to a polythiol composition (consisting of the compounds of formula (1) and formula (2), and the mass content of the compound of formula (1) in the composition is 5.0%). However, the optical material of Comparative Example 1 was prepared without changing the other conditions.

(Comparative example 2)
The optical composition of Comparative Example 2 was obtained by changing the polythiol composition of Example 1 to a polythiol composition (not containing the compound of formula (1) and consisting of the compound of formula (2)) and keeping the other conditions unchanged. was prepared.

The performance of the optical materials produced in Examples 1 to 10 and Comparative Examples 1 to 2 was tested, and the results are shown in Table 1.

(Example 11)
48.0 parts by mass of xylylene diisocyanate, 0.01 parts by mass of a catalyst (dibutyltin dichloride), and 0.10 parts by mass of a mold release agent (polyphosphate) were added to a flask and dissolved with stirring at 10 to 20°C. 48.0 parts by mass of a polythiol composition (the mass content of the compound of formula (1) in the composition was 0.5%) was added and stirred uniformly. A mixed solution was prepared by degassing using a vacuum pump, controlling the absolute pressure to 350 Pa or less, and setting the degassing time to 0.5 to 1.0 hours. The solution was poured into a mold having a diameter of 80 mm and a center thickness of 2.0 mm, and was heated and cured in an oven. The cured optical material was demolded, the resulting optical material was subjected to secondary curing, and its performance was measured. The refractive index was 1.6605, the softening temperature was 89.3° C., and the impact strength was 110 g.

(Example 12)
48.0 parts by mass of xylylene diisocyanate, 0.01 parts by mass of a catalyst (dibutyltin dichloride), and 0.10 parts by mass of a mold release agent (polyphosphate) were added to a flask and dissolved with stirring at 10 to 20°C. 48.0 parts by mass of a polythiol composition (the mass content of the compound of formula (1) in the composition was 0.1%) was added and stirred uniformly. A mixed solution was prepared by degassing using a vacuum pump, controlling the absolute pressure to 350 Pa or less, and setting the degassing time to 0.5 to 1.0 hours. The solution was poured into a mold having a diameter of 80 mm and a center thickness of 2.0 mm, and was heated and cured in an oven. The cured optical material was demolded, the resulting optical material was subjected to secondary curing, and its performance was measured. The refractive index was 1.6605, the softening temperature was 89.1° C., and the impact strength was 90 g.

(Comparative example 3)
48.0 parts by mass of xylylene diisocyanate, 0.01 parts by mass of a catalyst (dibutyltin dichloride), and 0.10 parts by mass of a mold release agent (polyphosphate) were added to a flask and dissolved with stirring at 10 to 20°C. 48.0 parts by mass of a polythiol composition (consisting of the compound of formula (2) and not containing the compound of formula (1)) was added and stirred uniformly. A mixed solution was prepared by degassing using a vacuum pump, controlling the absolute pressure to 350 Pa or less, and setting the degassing time to 0.5 to 1.0 hours. The solution was poured into a mold having a diameter of 80 mm and a center thickness of 2.0 mm, and was heated and cured in an oven. The cured optical material was demolded, the resulting optical material was subjected to secondary curing, and its performance was measured. The refractive index was 1.6604, the softening temperature was 87.9°C, and the impact strength was 32g.

(Comparative example 4)
48.0 parts by mass of xylylene diisocyanate, 0.01 parts by mass of a catalyst (dibutyltin dichloride), and 0.10 parts by mass of a mold release agent (polyphosphate) were added to a flask and dissolved with stirring at 10 to 20°C. 48.0 parts by mass of a polythiol composition (consisting of the compounds of formula (1) and formula (2), the content of the compound of formula (1) in the composition was 4%) was added and stirred uniformly. A mixed solution was prepared by degassing using a vacuum pump, controlling the absolute pressure to 350 Pa or less, and setting the degassing time to 0.5 to 1.0 hours. The solution was poured into a mold having a diameter of 80 mm and a center thickness of 2.0 mm, and was heated and cured in an oven. The cured optical material was demolded, the resulting optical material was subjected to secondary curing, and its performance was measured. The refractive index was 1.6605, the softening temperature was 86.7° C., and the impact strength was 32 g.

(Example 13)
22.8 parts by mass of hexamethylene diisocyanate, 10.0 parts by mass of isophorone diisocyanate, 16.0 parts by mass of hydrogenated xylylene diisocyanate, 0.15 parts by mass of catalyst (dibutyltin dichloride), 0.10 parts by mass of stripping agent (polyphosphate) of the mixture was added to a flask, and the mixture was stirred and dissolved at 10 to 20°C. 33.0 parts by mass of the polythiol composition according to claim 1 (the mass content of the compound represented by formula (1) in the composition is 0.5%), 18.2 parts by mass of pentaerythritol tetramercaptopropionate. 1 part and stirred uniformly. A mixed solution was prepared by degassing using a vacuum pump, controlling the absolute pressure to 350 Pa or less, and setting the degassing time to 0.5 to 1.0 hours. The solution was poured into a mold having a diameter of 80 mm and a center thickness of 2.0 mm, and was heated and cured in an open mold. The cured optical material was demolded, the resulting optical material was subjected to secondary curing, and its performance was measured. The refractive index was 1.5955, the softening temperature was 85.0°C, and the impact strength was 110 g.

(Example 14)
49.6 parts by mass of norbornane diisocyanate, 0.03 parts by mass of a catalyst (dibutyltin dichloride), and 0.75 parts by mass of a mold release agent (polyphosphate) were added to a flask and dissolved with stirring at 10 to 20°C. Adding 25.5 parts by mass of the polythiol composition according to claim 1 (the mass content of the compound of formula (1) in the composition is 1.0%) and 23.9 parts by mass of pentaerythritol tetramercaptopropionate. , stirred evenly. A mixed solution was prepared by degassing using a vacuum pump, controlling the absolute pressure to 350 Pa or less, and setting the degassing time to 0.5 to 1.0 hours. The solution was poured into a mold having a diameter of 80 mm and a center thickness of 2.0 mm, and was heated and cured in an open mold. The cured optical material was demolded, the resulting optical material was subjected to secondary curing, and its performance was measured. The refractive index was 1.5940, the softening temperature was 118° C., and the impact strength was 64 g.

(Example 15)
Add 59.4 parts by mass of 4,4-diisocyanate dicyclohexylmethane, 0.10 parts by mass of catalyst (dibutyltin dichloride), and 0.75 parts by mass of mold release agent (polyphosphate), and stir at 10 to 20°C. Dissolved. Adding 29.9 parts by mass of the polythiol composition according to claim 1 (the mass content of the compound of formula (1) in the composition is 1.0%) and 10.7 parts by mass of pentaerythritol tetramercaptopropionate, Stir evenly. A mixed solution was prepared by degassing using a vacuum pump, controlling the absolute pressure to 350 Pa or less, and setting the degassing time to 0.5 to 1.0 hours. The solution was poured into a mold having a diameter of 80 mm and a center thickness of 2.0 mm, and was heated and cured in an open mold. The cured optical material was demolded, the obtained optical material was secondarily cured, and its performance was measured. The refractive index was 1.5956, the softening temperature was 121° C., and the impact strength was 64 g.

From the data of the above examples and corresponding comparative examples, it can be further verified that the application of the polythiol composition of the present invention has significant technical effects compared to the prior art. The performance of the produced optical materials is significantly improved, especially by increasing the softening temperature of the material and improving its impact resistance.

The embodiments disclosed above enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. .

Claims (10)

A polythiol composition comprising a compound of formula (1) and a compound of formula (2).
The polythiol composition according to claim 1, characterized in that the mass content of the compound of formula (1) in the composition is 0.01 to 3.0%. The polythiol composition according to claim 1 or 2, characterized in that the mass content of the compound of formula (1) in the composition is 0.1 to 1.0%. A composition for optical materials, comprising the polythiol compound according to claim 1 and a polyisocyanate. The composition for optical materials according to claim 4, further comprising another polythiol compound. The polyisocyanate includes tetramethylene diisocyanate, hexamethylene diisocyanate, cyclohexane diisocyanate, 4,4'-diisocyanate dicyclohexylmethane, isophorone diisocyanate, norbornane diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, m-phenylene bis(dimethylmethylene) diisocyanate. , dithiodipropyl diisocyanate, dithiodiethyl diisocyanate, 2,5-bis(isocyanatomethyl)thiophene, 2,5-bis(isocyanatomethyl)-1,4-dithiane, 2,5-diisocyanate-1,4-dithiane , thiodihexyl diisocyanate, thiodipropyl diisocyanate, bis(isocyanatomethyl)adamantane, bis(isocyanatomethyl))tetrahydrothiophene, 2,6-bis(isocyanatomethyl)naphthalene, 1,5-naphthalene diisocyanate, diethylene diisocyanate, Claim 4, characterized in that it is one or more selected from trimethylhexamethylene diisocyanate, lysine triisocyanate, toluene diisocyanate, o-tolidine diisocyanate, diphenylmethane diisocyanate, diphenyl ether diisocyanate, and triphenylmethane triisocyanate. composition for optical materials. The polyisocyanate is one or more selected from hexamethylene diisocyanate, isophorone diisocyanate, norbornane diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, m-xylylene diisocyanate, and hydrogenated m-xylylene diisocyanate. The composition for optical materials according to claim 4, characterized in that: Other polythiol compounds include 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9- Trithiaundecane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, methanedithiol, methanetrithiol, bis(2-mercaptoethyl)ether, tetrakis(mercaptomethyl)methane , 1,2-dimercaptopropane, 1,3-dimercaptopropane, 1,4-dimercaptobutane, 1,6-dimercaptohexane, 2,2-dimercaptopropane, 1,2-bis(2-mercapto ethoxy)ethane, 1,2-bis(2-mercaptoethylthio))ethane, 2,3-dimercapto-1-propanol, 1,2-dimercaptoethane, 1,3-dimercapto-2-propanol, 2-mercapto Methyl-1,3-dimercaptopropane, 2-mercaptomethyl-1,4-dimercaptobutane, 1,2,3-trimercaptopropane, 2-(2-mercaptoethylthio)-1,3-dimercaptopropane , 2,4-dimercaptomethyl-1,5-dimercapto-3-thiapentane, bis(2-mercaptoethyl) sulfide, ethylene glycol bis(3-mercaptopropionate), diethylene glycol bis(2-mercaptoacetate), ethylene Glycol bis(2-mercaptoacetate), 1,4-butanediol bis(2-mercaptoacetate), trimethylolpropane trimercaptopropionate, pentaerythritol tetramercaptoacetate, diethylene glycol bis(3-mercaptopropionate), penta Erythritol tetramercaptopropionate, 1,2-dimercaptocyclohexane, 1,1,1-tris(mercaptomethyl)propane, 1,4-butanediol bis(3-mercaptopropionate), 1,3-dimercapto Cyclohexane, trimethylolpropane trimercaptoacetate, 1,4-dimercaptocyclohexane, 1,3-bis(mercaptomethyl)cyclohexane, 1,4-bis(mercaptomethyl)cyclohexane, bis(4-mercaptophenyl)sulfone, 2, 5-dimercaptomethyl-1,4-dithiane, 2,5-bis(2-mercaptoethylthiomethyl)-1,4-dithiane, 2,5-dimercaptomethyl-1-thiane, 2,5-dimercapto Ethyl-1-thiane, 2,5-dimercaptomethylthiophene, bis(4-mercaptophenyl) sulfide, 1,2-dimercaptobenzene, 1,3-dimercaptobenzene, 1,4-dimercaptobenzene, 1, 3-bis(mercaptomethyl)benzene, 2,5-dimercaptomethyl-1,4-dithiane, 1,4-bis(mercaptomethyl)benzene, 2,2'-dimercaptobiphenyl, bis(4-mercaptophenyl) Methane, 2,2-bis(4-mercaptophenyl)propane, 4,4'-dimercaptobiphenyl, bis(4-mercaptophenyl)ether, bis(4-mercaptomethylphenyl)methane, 1,1,3,3 -tetrakis(mercaptomethylthio)propane, 2,2-bis(4-mercaptomethylphenyl)propane, bis(4-mercaptomethylphenyl)ether, bis(4-mercaptomethylphenyl)sulfide, 2,5-dimercapto-1, The composition for optical materials according to claim 5, characterized in that the composition is one or more selected from 3,4-thiadiazole and 3,4-thiophenedithiol. A method for producing an optical material, which comprises adding a catalyst in an amount of 0.001% to 0.2% based on the total mass of the composition for optical material to the composition for optical material, and polymerizing and curing the composition. 10. The method for producing an optical material according to claim 9, wherein the catalyst is one selected from dibutyltin dilaurate, dibutyltin dichloride, dibutyltin oxide, and stannous octoate.