WO2024090855A1

WO2024090855A1 - Isocyanate composition

Info

Publication number: WO2024090855A1
Application number: PCT/KR2023/015727
Authority: WO
Inventors: 김지연; 우은지; 심유진; 김종진; 권도우
Original assignee: 한화솔루션 주식회사
Priority date: 2022-10-26
Filing date: 2023-10-12
Publication date: 2024-05-02

Abstract

Provided is an isocyanate composition, the present invention comprising a phosphonate-based compound of a specific structure along with an isocyanate-based compound to enhance storage stability and consequently suppress discoloration and white-turbidity phenomenon, improve workability such as reduced filtration time, and increase resistance to discoloration when used in products.

Description

Isocyanate composition

Cross-Citation with Related Application(s)

This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0139402 dated October 26, 2022 and Korean Patent Application No. 10-2023-0135186 dated October 11, 2023, and the Korean Patent Application No. All content disclosed in the literature is incorporated as part of this specification.

The present invention relates to an isocyanate composition that has improved storage stability, suppresses discoloration and cloudiness, and has improved workability such as shortened filter time.

Isocyanate-based compounds are compounds with high utility not only in the chemical industry and resin industry, but also in fine chemical products including optical materials. Demand for xylylene diisocyanate (XDI), a representative example of an isocyanate-based compound, is increasing as a high-value chemical material as a raw material for advanced optical lenses.

However, because isocyanate-based compounds exhibit high reactivity, they tend to react with moisture in the air during storage, causing discoloration or white turbidity. In addition, when isocyanate-based compounds are stored for a long time, discoloration or white turbidity occurs as oligomers larger than dimers are formed through self-polymerization.

Isocyanate-based compounds are raw materials for polyurethane and are used in a variety of applications such as coatings, adhesives/adhesives, paints, foams, and optical materials. Polyurethane lenses are manufactured using isocyanate-based compounds that cause discoloration or white clouding. In this case, the rapid increase in the molecular weight of the polymer solution causes a decrease in stirring power, an increase in filter time, and filter clogging, which reduces workability, and also causes problems such as decreased transparency and discoloration of the manufactured lens.

To solve this problem, a method of manufacturing and storing it by filling or sealing it with nitrogen gas and blocking it from air is used, but there is still a risk of discoloration and clouding until the isocyanate-based compound is completely exhausted.

In addition, a method of prescribing a stabilizer for isocyanate-based compounds was proposed, but there was a problem that the added stabilizer caused coloring during subsequent product manufacturing or reduced the stability of the isocyanate-based compound.

Accordingly, there is a need for research on the production of isocyanate compositions that can improve storage stability so that there is no risk of discoloration or white clouding even during long-term storage and that can show improved workability when manufacturing products.

The purpose of the present invention is to provide an isocyanate composition that improves storage stability, suppresses discoloration and cloudiness, improves transparency when applied to the resulting product, and improves workability, such as shortening the filter time.

Accordingly, according to the present invention, an isocyanate composition is provided, comprising an isocyanate-based compound and a phosphonate-based compound represented by the following formula (1):

[Formula 1]

In Formula 1,

R _a and R _b are each independently a substituted or unsubstituted C _1-20 alkyl group, a substituted or unsubstituted C _6-20 aryl group, a substituted or unsubstituted C _7-30 alkylaryl group, or a substituted or unsubstituted It is a C _7-30 arylalkyl group.

Also according to the present invention, the isocyanate composition; and at least one of a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, and a polyfunctional episulfide-based compound.

In addition, according to the present invention, an article comprising a polymer obtained by polymerizing the isocyanate composition and at least one of a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, and a polyfunctional episulfide-based compound is provided.

The isocyanate composition according to the present invention has improved storage stability, suppresses discoloration and white cloudiness, and can improve transparency when applied to the resulting product.

In addition, the isocyanate composition can exhibit improved workability, such as shortening the filter time.

In addition, the polymerization composition containing the isocyanate composition and a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, or a multifunctional episulfide-based compound is used in plastic paints, automotive paints, film coatings, and various inks due to its excellent physical properties. , It can be used in a wide range of fields such as various adhesives/adhesives, sealing materials, various microcapsules, plastic lenses, artificial and synthetic leather, reaction injection molding (RIM) products, slush powder, elastic molded products (spandex), and urethane foam. Among these, the isocyanate composition is particularly useful as a material for optical products such as optical adhesives, optical adhesives, spectacle lenses, camera lenses, and prisms, due to its excellent viscosity/adhesion properties and transparency.

The terminology used herein is for the purpose of describing exemplary embodiments only and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise,” “comprise,” or “have” are intended to designate the presence of implemented features, steps, components, or a combination thereof, and are intended to indicate the presence of one or more other features or steps, It should be understood that the existence or addition possibility of components or combinations thereof is not excluded in advance.

As used herein, the term “substituted or unsubstituted” refers to deuterium; halogen group; Nitrile group; nitro group; hydroxyl group; carbonyl group; ester group; imide group; amino group; Phosphine oxide group; Alkoxy group; Aryloxy group; Alkylthioxy group; Arylthioxy group; Alkyl sulphoxy group; Aryl sulfoxy group; silyl group; boron group; Alkyl group; Cycloalkyl group; alkenyl group; Aryl group; Aralkyl group; Aralkenyl group; Alkylaryl group; Alkylamine group; Aralkylamine group; heteroarylamine group; Arylamine group; Arylphosphine group; or substituted or unsubstituted with one or more substituents selected from the group consisting of a heteroaryl group containing one or more of N, O and S atoms, or a combination thereof, specifically, two or more of the above-exemplified substituents are connected. It means substituted or unsubstituted by a combining group. For example, “a substituent group in which two or more substituents are connected” may be a biphenyl group. That is, the biphenyl group may be an aryl group, or it may be interpreted as a substituent in which two phenyl groups are connected.

Unless otherwise stated herein, ordinary temperature means 23 ± 5°C, which is a typical laboratory temperature, and ordinary pressure means 1 ± 0.05 atm, which is a typical laboratory pressure.

In addition, unless otherwise stated in this specification, a nitrogen atmosphere means the presence of nitrogen in the atmospheric gas. Specifically, the nitrogen concentration in the atmospheric gas is greater than 0% by volume and less than 100% by volume.

Since the present invention can make various changes and take various forms, specific embodiments will be illustrated and described in detail below. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Hereinafter, the present invention will be described in detail.

Due to the high reactivity of isocyanate-based compounds with moisture or alcohol, after production, they are filled with nitrogen, completely sealed, and stored in refrigeration. However, when opened for use, it reacted with moisture in the air, or discoloration or white clouding occurred depending on the air temperature. In addition, when an isocyanate-based compound that was stored in a closed container was opened and used, the oligomer content increased or yellowing occurred during the storage time until it was used up. As a result, when polyurethane lenses are manufactured using such isocyanate-based compounds, the viscosity of the composition decreases rapidly due to a rapid increase in the viscosity of the composition, resulting in a decrease in stirring power, an increase in filter time, or filter clogging, which reduces workability and reduces the transparency of the manufactured lens. It deteriorated and discoloration occurred.

Accordingly, the present inventors studied an isocyanate composition that can suppress the rate of increase in oligomers generated by self-polymerization of isocyanate-based compounds during long-term storage of isocyanate-based compounds and can show improved workability during lens manufacturing. As a result, when a phosphonate-based compound is used together with an isocyanate-based compound, the oligomerization rate of the isocyanate-based compound can be reduced, and as a result, discoloration and whitening caused by the oligomer can be suppressed, and The present invention was completed after confirming that lens color change due to various additives added to improve lens workability can be prevented and workability can be improved by shortening the filter time during lens manufacturing.

Specifically, the isocyanate composition according to the present invention includes an isocyanate-based compound and a phosphonate-based compound represented by the following formula (1):

[Formula 1]

In Formula 1,

In addition, when R _a and R _b are substituted, specifically selected from the group consisting of alkyl group, cycloalkyl group, aryl group, arylalkyl group, alkylaryl group, hydroxy group, alkoxy group, alkoxyalkyl group, aryloxy group and combinations thereof. It may be substituted with one or more substituents.

Specifically, in Formula 1, R _a and R _b are each independently a substituted or unsubstituted C _1-18 alkyl group, a substituted or unsubstituted C _6-18 aryl group, or a substituted or unsubstituted C _7-18 alkylaryl. group, or a substituted or unsubstituted C _7-18 arylalkyl group, and when R _a and R _b are substituted, each independently a C _1-12 alkyl group, a C _3-12 cycloalkyl group, or a C _6-12 aryl group. group, C _7-18 arylalkyl group, C _7-18 alkylaryl group, hydroxy group, C _1-12 alkoxy group; It may be substituted with one or more substituents selected from the group consisting of a C _2-18 alkoxyalkyl group, a C _6-12 aryloxy group, and a combination thereof.

More specifically, in Formula 1, R _a and R _b may each independently be a C _1-8 alkyl group, a phenyl group, or a benzyl group, where R _a and R _b are each independently a C _1-6 alkyl group or a phenyl group. It may be substituted or unsubstituted with one or more substituents selected from the group consisting of , hydroxy groups, and combinations thereof.

Meanwhile, in the present invention, a combined group means that two or more functional groups are combined. For example, the combination of a hydroxy group and a methyl group can be a methoxy group or a hydroxymethyl group, and the combination of a hydroxy group and a phenyl group can be a phenoxy group or a hydroxyphenyl group. As another example, the combined group of a methyl group and a phenyl group may be a benzyl group or a methylphenyl group.

More specifically, in Formula 1, R _a and R _b are each independently selected from a methyl group, ethyl group, t-butyl group, hexyl group, 3,3-dimethylbutan-2-yl group, 2-ethylhexyl group, phenyl group, It may be a hydroxybenzyl group, or a 3,5-di-tert-butyl-4-hydroxybenzyl group.

Specific examples of the phosphonate-based compounds include ethyl methylphosphonate (CAS NO. 1832-53-7), pinacolyl methylphosphonate, mono-2-ethylhexyl (2 -Ethylhexyl)phosphonate (mono-2-ethylhexyl(2-ethylhexyl)phosphonate), or monoethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate (monoethyl 3,5-di- tert-butyl-4-hydroxybenzylphosphonate), etc., and any one or a mixture of two or more of these may be used.

As the acidity of the isocyanate composition increases, the reaction rate of the isocyanate decreases, and as a result, oligomerization of the isocyanate may be delayed or suppressed.

When preparing an isocyanate composition, the phosphonate-based compound reacts with alcohol to provide a free acid component. Accordingly, the acidity of the isocyanate composition can be increased, and as a result, the reaction rate and oligomerization of the isocyanate can be delayed or suppressed, and discoloration and clouding caused by the oligomer can be suppressed.

In addition, the phosphonate-based compound prevents changes in lens color due to additives added to improve lens workability, and also suppresses an increase in viscosity of the isocyanate composition, thereby shortening the filter time when manufacturing lenses.

Compared to phosphonic acid (HPO(OH) ₂ ) and phosphorous acid (P(OH) ₃ ), the phosphonate-based compound exhibits a superior effect in terms of storage stability due to the difference in reactivity. You can.

In addition, phosphoric acid (H ₃ PO ₄ (or PO(OH) ₃ )) generates precipitates during the preparation of isocyanate compositions due to its excessively high reactivity, and as a result, it is difficult to prepare a composition for polymerization using it, but the phosphoric acid Nate-based compounds exhibit an appropriate level of reactivity, so there is no concern about the generation of precipitates.

In addition, phosphoric acid ester may have some effect of increasing the acidity of the isocyanate composition, but has the problem of increasing the viscosity of the polymerization composition and resulting in filter clogging during lens manufacturing. On the other hand, the phosphonate-based compound has no risk of increasing viscosity.

On the other hand, the acidity (as HCl) (ppm) of the isocyanate composition is calculated by converting the amount of acid component liberated by reaction with alcohol at room temperature (23 ± 5°C) into HCl, and then calculating it relative to the total weight of the isocyanate compound. This value is expressed as a weight ratio. The acidity in the isocyanate composition according to the present invention is determined depending on the content of acidic groups derived from the phosphonate-based compound. Accordingly, acidity can be adjusted by controlling the type and/or input amount of the phosphonate-based compound, and the effect of using the phosphonate-based compound can be further improved by optimizing the acidity range.

Specifically, the isocyanate composition according to the present invention may have an acidity of 500 ppm or less.

As the acidity of the isocyanate composition increases, the reaction rate of the isocyanate decreases, and as a result, oligomerization of the isocyanate may be delayed or suppressed. However, if the acidity is too high, the reaction rate of the isocyanate becomes too slow, leading to the formation of polymers and use in the manufacture of products such as lenses. This can be difficult. In addition, it is necessary to use an excessive amount of catalyst to compensate for the delay in the isocyanate reaction rate due to the use of an excessive amount of phosphonate-based compound. In this case, the excessive catalyst reduces reaction efficiency, deteriorates physical properties, and discolors and clouds the isocyanate composition. Deterioration of product quality may occur.

Accordingly, the phosphonate-based compound may be added in an amount such that the acidity of the isocyanate composition is 500 ppm or less, and more specifically, it may be added so that the acidity of the isocyanate composition is 500 ppm or less, or 300 ppm or less, or 200 ppm or less, or 150 ppm or less, or 130 ppm or less. You can. Meanwhile, in order to fully realize the effect of increasing acidity due to the addition of the phosphonate-based compound, the phosphonate-based compound may be added so that the acidity of the isocyanate composition is 100 ppm or more, 110 ppm or more, or 113 ppm or more.

In the present invention, the acidity was specifically calculated by performing potentiometric titration on the isocyanate composition with a 0.01N potassium hydroxide (KOH) methanol solution and using the resulting measured value according to Equation 1 below. The measurement method and conditions are explained in detail in the experimental examples below.

[Equation 1]

Acidity (as HCl) (ppm) = [(AB) × N × f × 36.5 × 10 ⁶ ]/(C × 10 ³ )

In Equation 1 above,

A: Volume of KOH methanol solution consumed for titration of isocyanate composition sample (ml)

B: Volume of KOH methanol solution consumed in blank titration (ml)

N: normality of KOH methanol solution

f: When the normal concentration of the KOH methanol solution used during measurement changes, it is a correction factor to be the same as a 0.01N KOH methanol solution, and is measured according to ASTM D-1638, TOLOCHIMIE 04-01-68. For 0.01N KOH methanol solution the f value is 1

C: Weight of isocyanate composition sample (g)

More specifically, in the isocyanate composition according to the present invention, the phosphonate-based compound may be included in an amount of 100 to 3,000 ppm based on the total weight of the isocyanate-based compound under conditions that meet the above-mentioned acidity range. When the content is within the above-mentioned range, the isocyanate composition exhibits an acidity within the above-described range, thereby realizing the effect of delaying the oligomerization rate within the optimal range. More specifically, the phosphonate-based compound is 100ppm or more, or 200ppm or more, or 300ppm or more, or 350ppm or more, or 380ppm or more, or 600ppm or more, or 900ppm or more, and 3,000ppm or less, based on the total weight of the isocyanate-based compound. , or 2000 ppm or less, or 1500 ppm or less, or 1200 ppm or less, or 1100 ppm or less.

Meanwhile, in the isocyanate composition, the isocyanate-based compound is a monomer compound containing one or more, two or more, or two to four isocyanate groups in the molecule. More specifically, the isocyanate-based compound is a diisocyanate compound containing two isocyanate groups in the molecule.

Specific examples of the diisocyanate compound include 1,5-pentamethylene diisocyanate, toluene diisocyanate, methylene diphenyl diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, and cyclohexylene diisocyanate. Examples include isocyanate, isophorone diisocyanate, o-xylylene diisocyanate, m-xylylene diisocyanate, or p-xylylene diisocyanate, and any one or a mixture of two or more of these may be used.

Among the above compounds, o-xylylene diisocyanate, m-xylylene diisocyanate, p-xylylene diisocyanate, or mixtures thereof may be used as the isocyanate-based compound.

Additionally, the isocyanate composition according to the present invention may further include a phenol-based stabilizer.

In general, discoloration and white turbidity in isocyanate compositions are caused not only by oligomerization of isocyanate, but also by quinoidization of the benzene ring within the molecule, or by adducts generated by oxygen, moisture, or high heat during synthesis and purification. . The phenol-based stabilizer can prevent coloring and whitening of the isocyanate composition by suppressing the above-mentioned side reactions through radical capture reaction.

However, if the content of the stabilizer is below a certain level, it is difficult to achieve a sufficient discoloration or clouding prevention effect. Conversely, if it is included in excessive amounts exceeding a certain level, the phenol-based stabilizer itself may cause coloring and clouding. Accordingly, in the present invention, the phenol-based stabilizer is included in an amount of 5 ppm to 1000 ppm based on the total weight of the isocyanate-based compound. More specifically, it is 5 ppm or more, or 8 ppm or more, or 10 ppm or more, and 1000 ppm or less, or 500 ppm or less, or 200 ppm or less, or 100 ppm or less, or 50 ppm or less, or 30 ppm or less, based on the total weight of the isocyanate-based compound. By including it in an amount of 20ppm or less, a more enhanced coloring and whitening inhibition effect can be realized.

In addition, by controlling the usage amount of the phosphonate-based compound and phenol-based stabilizer, the increase rate of oligomer content can be reduced and the coloring and whitening inhibition effect can be further improved. Specifically, the phosphonate-based compound and the phenol-based stabilizer may be included in a weight ratio of 1.5:1 to 6:1. More specifically, it may be 1.5:1 or more, or 1.9:1 or more, or 2:1 or more, or 3:1 or more, and 6:1 or less, or 5.5:1 or less, or 4.5:1 or less. At this time, when describing the weight ratio, “above” and “below” are based on the amount of phosphonate-based compound used.

The phenol-based stabilizer is specifically phenol or a derivative thereof containing a phenol structure in the molecule, and specific examples include phenol; Or dibutylhydroxytoluene (BHT), t-Butylhydroquinone (TBHQ), butylhydroxyanisol (BHA), pentaerythritol tetrakis [3- (3,5-di-tert-butyl -4-hydroxyphenyl) propionate] (Irganox 1010, manufactured by BASF), thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (Irganox 1035 , manufactured by BASF), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (Irganox 1076, manufactured by BASF), N,N'-hexane-1,6-diyl Bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide] (Irganox 1098, manufactured by BASF), benzene propanoic acid, 3,5-bis(1,1-dimethylethyl)- 4-Hydroxy, C7-C9 side chain alkyl ester (Irganox 1135, BASF), 3,3',3",5,5',5"-hexa-tert-butyl-a,a',a"-( Mesitylene-2,4,6-triyl) trip-cresol (Irganox 1330, manufactured by BASF), ethylene bis(oxyethylene) bis[3-(5-tert-butyl-4-hydroxy-m-tryl) propionate] (Irganox 245, manufactured by BASF), hexamethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (Irganox 259, manufactured by BASF), or 1, 3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2-4-6(1H,3H,5H)-trione (Irganox 3114 , manufactured by BASF), 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate, 2,6-di-tert -Butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, stearyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, distearyl (3, 5-di-tert-butyl-4-hydroxybenzyl)phosphate, thiodiethylene glycol bis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,6-hexamethylene Bis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,6-hexamethylene bis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate amide], 4,4'-thiobis(6-tert-butyl-m-cresol), 2,2'-methylene bis(4-methyl-6-tert-butylphenol), 2,2'-methylenebis( 4-ethyl-6-tert-butylphenol), bis[3,3-bis(4-hydroxy-3-tert-butylphenyl)butyric acid]glycol ester, 4,4'-butylidenebis(6-tert) -Butyl-m-cresol), 2,2'-ethylidene bis(4,6-di-tert-butylphenol), 2,2'-ethylidene bis(4-2-butyl-6-tert-butyl) Phenol), 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, bis[2-tert-butyl-4-methyl-6-(2-hydroxy-3 -tert-butyl-5-methylbenzyl)phenyl]terephthalate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, tetra kiss[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 2-tert-butyl-4-methyl-6(2-acryloyloxy-3- tert-butyl-5-methylbenzyl)phenol, 3,9-bis 1,1-dimethyl-2-[(3-tert-butyl-5-methylbenzyl)propionyloxy]ethyl-2,4,8,10 -tetraoxaspiro[5,5]undecane or triethylene glycol bis[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], or 6-[3-(3-tert-butyl) -4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepine (6-[3 -(3-tert-Butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin, SUMILIZER GP, Sumitomo sterically hindered phenol such as Saje); and the like, and any one or a mixture of two or more of these may be used.

Among these, in terms of the effect of improving transparency by preventing coloring and clouding, phenol, dibutylhydroxytoluene, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4, 6-di-tert-pentylphenyl acrylate, octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 6-[3-(3-tert-butyl-4) -hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepine or mixtures thereof may be used. there is.

In addition, the isocyanate composition may further include an oligomer in which two or more of the above-described isocyanate-based compounds are bonded as a by-product.

The oligomer of the isocyanate-based compound may be a dimer in which two isocyanate-based compounds are bonded, a trimer in which three isocyanate-based compounds are bonded, 4 or more, or 4 to 10 isocyanate-based compounds bonded together. The oligomer may be produced by a side reaction during the synthesis of an isocyanate-based compound by reacting an amine compound with a phosgene compound, or may be a result of a synthesized isocyanate compound forming its own polymer with high reactivity. These oligomers cause problems not only in the transparency of the isocyanate composition itself, but also in discoloration and cloudiness of the polymerization composition in which the isocyanate composition is used. Therefore, in the case of isocyanate compositions used in the optical field, it is necessary to reduce the content of the oligomers. However, extremely controlling the oligomer content in commercial processes is difficult in terms of process efficiency and cost. Accordingly, the isocyanate composition according to the present invention may further include the oligomers that are inevitably generated, but the transparency and color characteristics of the product can be improved while maintaining fairness by controlling the content through the manufacturing process and the use of phosphonic acid. there is.

Specifically, the isocyanate composition may contain less than 1 area% of oligomers immediately after production. At this time, the oligomer content is calculated as a percentage of the ratio of the peak area corresponding to the oligomer based on the total peak area in the molecular weight distribution curve obtained through gel permeation chromatography analysis of the isocyanate composition immediately after preparation. Additionally, the area of the peak is calculated through integration. The oligomer content measurement and calculation method is as described in the experimental examples below.

In addition, as the isocyanate composition contains a phosphonate-based compound that retards the oligomerization reaction rate of isocyanate as described above, the oligomer content and the rate of increase in oligomer content are low even after passage of time compared to the conventional method.

Specifically, the isocyanate composition has an oligomer content increase rate of 600% or less, more specifically, 100 to 600%, or 300 to 590%, calculated according to Equation 2 below.

[Equation 2]

Oligomer content increase rate (%) = [(C _f - Ci)/Ci] × 100

In Equation 2 above,

Ci is the oligomer content (area %) in the isocyanate composition immediately after production, calculated through gel permeation chromatography analysis,

C _f is the content (area %) of oligomers in the isocyanate composition calculated through gel permeation chromatography analysis after storing the isocyanate composition at 15°C for 8 weeks under a nitrogen atmosphere.

At this time, the ‘under nitrogen atmosphere’ specifically refers to the condition of 100% by volume of nitrogen based on the total volume of the atmospheric atmosphere through nitrogen filling.

Specifically, Ci and C _f are calculated values calculated according to Equation 3 below.

Meanwhile, in the present invention, nitrogen with a purity of 99.999% was used when filling the nitrogen.

[Equation 3]

Oligomer content (area%) = [E/D] × 100

In Equation 3 above,

D is the total area under the curve in the molecular weight distribution curve (GPC curve) obtained through gel permeation chromatography (GPC) analysis of the isocyanate composition,

E is the area of the peak corresponding to the oligomer in the molecular weight distribution curve for the isocyanate composition.

The gel permeation chromatography analysis conditions are in accordance with the experimental examples described below.

In addition, the total area under the curve of the GPC curve for the isocyanate composition and the area of the fraction corresponding to the oligomer can each be obtained through integration. At this time, the oligomer refers to a polymer with a weight average molecular weight (Mw) of 600 to 2000 g/mol, and the fraction corresponding to the oligomer in the GPC curve is 19.42 ≤ logMw ≤ 22.18.

More specifically, the isocyanate composition was stored at 15°C for 8 weeks under a nitrogen atmosphere, specifically under conditions of 100% by volume of nitrogen in the atmosphere through nitrogen filling, and then the oligomer content calculated through GPC analysis, that is, GPC The oligomer area ratio may be 0.5 area% or less, or 0.45 area% or less. Since a lower oligomer content means superior discoloration resistance, the lower limit is not particularly limited, but may be greater than 0 area % or greater than 0.1 area %. In the present invention, nitrogen with a purity of 99.999% was used when filling the nitrogen.

Meanwhile, in the present invention, the content (area%) of oligomers in the isocyanate composition is determined through GPC analysis by using the logarithmic value (log M) of the weight average molecular weight (M) as the x-axis, and the molecular weight distribution for the logarithmic value ( Obtain a molecular weight distribution curve (GPC curve) for the isocyanate composition with dwt/dlog M) as the y-axis, and express the area ratio of the fraction corresponding to the oligomer out of the total area of the GPC curve as a percentage, using the above equation It can be calculated according to Equation 3. Specific GPC analysis methods and conditions are described in detail in the experimental examples below.

In this way, since the rate of increase in oligomer content and the oligomer content are low immediately after and after the production of the isocyanate composition, discoloration and white cloudiness of the isocyanate composition can be effectively controlled.

Specifically, the isocyanate composition has an APHA value of 15 or less as measured according to ASTM D1209 after being stored at 15°C for 8 weeks in a nitrogen atmosphere, specifically in an atmosphere of 100% by volume nitrogen through nitrogen filling. More specifically, it is 14.5 or less, or 14 or less. Since the lower the APHA value, the better the discoloration resistance, the lower limit is not limited, but may be greater than 0 or greater than 1, for example.

In addition, the isocyanate composition has a haze of 0.5% or less as measured according to ASTM D1003 after being stored at 15°C for 8 weeks in a nitrogen atmosphere. More specifically, it is 0.45% or less, or 0.4% or less. Since a smaller haze value means lower white turbidity and better transparency, the lower limit is not limited, but may be, for example, more than 0%, 0.01 % or more, or 0.1 % or more.

In addition, the isocyanate composition does not show any cloudiness even after being stored at 15°C for 12 weeks in a nitrogen atmosphere.

The above isocyanate composition can be prepared by mixing an isocyanate-based compound and a phosphonate-based compound represented by Formula 1.

More specifically, the isocyanate composition includes the steps of reacting an amine or a salt thereof with phosgene to produce an isocyanate-based compound; and mixing the isocyanate-based compound with the phosphonate-based compound represented by Formula 1.

The amine is an aromatic, alicyclic, or aliphatic diamine containing two amine groups in the molecule.

More specifically, the amine is 1,3-xylylene diamine (m-xylylene diamine, m-XDA), 1,4-xylylene diamine (p-xylylene diamine, p-XDA), 1,3-bis ( It may be aminomethyl)cyclohexane, or 1,4-bis(aminomethyl)cyclohexane, and depending on the structure of the desired diisocyanate, any one or a mixture of two or more of these may be used.

In addition, the salt of the amine refers to a salt produced by the reaction of the amine and an acid, and may be, for example, a hydrochloride salt produced by the reaction of an amine and anhydrous hydrochloric acid, a carbonate produced by the reaction of an amine and carbonic acid, etc. While amines react rapidly with phosgene, the reaction rate can be slowed when converted to a solid salt.

Specifically, salts of the amine include 1,3-xylylene diamine hydrochloride, 1,4-xylylene diamine hydrochloride, 1,3-bis(aminomethyl)cyclohexane hydrochloride, and 1,4-bis(aminomethyl)cyclo. Hexane hydrochloride, 1,3-xylylene diamine carbonate, and 1,4-xylylene diamine carbonate, 1,3-bis(aminomethyl)cyclohexane carbonate, or 1,4-bis(aminomethyl)cyclohexane carbonate, etc. Any one or a mixture of two or more of these may be used.

Additionally, the preparation of the amine salt by reaction between the amine and the acid can be performed in a solvent. At this time, the solvent includes aromatic hydrocarbon solvents such as benzene, toluene, xylene, and ethylbenzene; Chlorinated aromatic hydrocarbon solvents such as monochlorobenzene, 1,2-dichlorobenzene, and 1,4-dichlorobenzene; Chlorinated hydrocarbon solvents such as dichloromethane, chloroform, and carbon tetrachloride can be used, and two or more of these can be used in combination. In addition, these solvents can also be used as solvents for the phosgenation reaction, so after obtaining an amine salt by reacting an amine with an acid in the solvent, phosgene can be added to perform the phosgenation reaction without a separate purification process.

The amine salt preparation may be performed at a temperature of 40°C or lower, more specifically, 5 to 30°C. Additionally, the temperature may increase during the reaction due to the heat of reaction, but it is preferable that the maximum temperature in the reactor is maintained at 90°C or lower.

Next, the reaction between the amine or its salt and phosgene may be performed at a temperature range of 80°C or higher, or 90°C or higher, and 140°C or lower, or 130°C or lower. If the reaction temperature is too low, problems such as plugging may occur due to precipitation of solids, and if the temperature is too high, there may be side reaction problems such as phosgene decomposition, so it is preferable to carry out the reaction in the above temperature range.

Additionally, the reaction between the amine or its salt and phosgene may be carried out in an organic solvent.

The organic solvent may include at least one of an aromatic hydrocarbon-based organic solvent and an ester-based organic solvent.

The aromatic hydrocarbon-based organic solvent may specifically be a halogenated aromatic hydrocarbon-based organic solvent such as monochlorobenzene, 1,2-dichlorobenzene, or 1,2,4-trichlorobenzene.

In addition, the ester-based organic solvent specifically includes amyl formate, n-butyl acetate, isobutyl acetate, n-amyl acetate, isoamyl acetate, methylisoamyl acetate, methoxybutyl acetate, sec-hexyl acetate, 2 -Ethylbutyl acetate, 2-ethylhexyl acetate, cyclohexyl acetate, methylcyclohexyl acetate, benzyl acetate, ethyl propionate, n-butyl propionate, isoamyl propionate, ethyl acetate, butyl stearate, butyl lac. fatty acid esters such as tate or amyl lactate; and aromatic carboxylic acid esters such as metal salicylate, dimethyl phthalate, or methyl benzoate.

More specifically, the organic solvent includes at least one of aromatic hydrocarbon-based organic solvents and ester-based organic solvents having a boiling point of 100°C or higher, or 100 to 200°C, among the aromatic hydrocarbon-based organic solvents and ester-based organic solvents. It may be.

When the phosgenation reaction is performed in an organic solvent, the amine or its salt may be used at a concentration of 20% by volume or less, for example, 1 to 20% by volume, or 5 to 20% by volume. When the concentration of amine or its salt exceeds 20% by volume, there is a risk that a large amount of amine salt may precipitate.

In addition, when reacting the amine or its salt with phosgene, a compound represented by the following formula (2) may be further optionally added.

[Formula 2]

In Formula 2 above,

R ₁ to R ₄ are each independently a substituted or unsubstituted C _1-12 alkyl group, a substituted or unsubstituted C _3-12 cycloalkyl group, or a substituted or unsubstituted C _6-12 aryl group,

X is hydrogen, hydroxy or acetamido,

Y is oxyl, substituted or unsubstituted C _1-12 alkoxy, or substituted or unsubstituted C _6-12 aryloxy.

The compound represented by Formula 2 promotes the forward reaction by eliminating hydrogen from carbamoyl chloride, an amine or intermediate product during the phosgenation reaction, and suppresses side reactions, thereby producing by-products ethylbenzyl isocyanate (EBI) and chloromethylbenzyl isocyanate (CMBI). It plays a role in suppressing the generation of monoisocyanates such as

More specifically, in the compound represented by Formula 2, in Formula 2, R ₁ to R ₄ are each independently C _1-12 alkyl, X is hydrogen, hydroxy group or acetamido group, and Y is oxyl It may be a (O·) compound.

Specific examples include, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (4- Hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl; hereinafter referred to as 4-hydroxy TEMPO), and 4-acetamido-2,2,6,6-tetramethylpiperidin 1-oxyl. Any one or a mixture of two or more of these may be used.

Additionally, the compound represented by Formula 2 may be used in an amount of 0.05 to 2 moles based on 100 moles of the amine or its salt. More specifically, it may be used in a ratio of 0.05 mol or more, or 0.1 mol or more, or 0.15 mol or more, and 2 mol or less, or 1 mol or less, or 0.8 mol or less. When used in the above content range, it is preferable because the generation of oligomers of diisocyanate is minimized and diisocyanate can be synthesized with high purity and high yield.

The isocyanate formed as a result of the above-described phosgenation reaction is obtained as a mixture of solvent, unreacted phosgene, and by-products mixed together with hydrogen chloride. Accordingly, a purification process, distillation, to separate the isocyanate compound from the reaction mixture with high purity One or more of the solvent removal process through, nitrogen bubbling of unreacted phosgene and hydrogen chloride gas, etc. may be performed.

The purification step may be performed by a conventional method used for purifying isocyanate compounds, for example, by reduced pressure distillation and/or thin film distillation.

However, if the purification process of the isocyanate compound is carried out under excessively high temperature conditions or the time of the purification step is increased, the stability of the isocyanate compound may be greatly reduced, and if the purification process is carried out at an excessively low temperature, the process efficiency may be reduced. Accordingly, the purification step is preferably performed at a temperature of 100 to 170° C. for 5 to 16 hours. If the maximum temperature of the purification step exceeds 170°C or the residence time of the purification step exceeds 16 hours, the prepared isocyanate may absorb excessive heat and lower stability.

Next, the obtained isocyanate compound is mixed with the phosphonate-based compound represented by Chemical Formula 1 to prepare an isocyanate composition.

The mixing process can be performed according to a conventional method, and the type and amount of the phosphonate-based compound to be mixed are as described above.

Additionally, during the mixing process, additional additives used in the isocyanate composition may be added. For example, as described above, a phenol-based stabilizer may be further added to improve the storage stability of the isocyanate composition. The type and amount of the phenolic stabilizer used are the same as previously described.

Since the isocyanate composition prepared by the production method of the present invention described above has excellent storage stability and high transparency, it can be suitably used as a polymerization composition for manufacturing optical articles.

Accordingly, according to the present invention, a composition for polymerization containing the above-described isocyanate composition and at least one of a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, and a polyfunctional episulfide-based compound is provided.

The composition for polymerization may include the isocyanate composition and any one or more of a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, and a polyfunctional episulfide-based compound in a mixed state, or may be included in a state separated from each other. You may. That is, in the polymerization composition, the isocyanate composition and the polyfunctional thiol-based compound, polyfunctional alcohol-based compound, or polyfunctional episulfide-based compound are blended in contact with each other, or are separated so as not to contact each other. It can be.

In the polymerization composition, the polyfunctional thiol-based compound is a compound containing two or more thiol groups (-SH) in one molecule, specifically, two or more, three or more, and eight or less in the molecule. Alternatively, it may be a compound having 5 or less thiol groups.

The polyfunctional thiol-based compound is, for example, 2,3-bis(2-sulfanylethylsulfanyl)propane-1-thiol. , 1,9-dimercapto-3,7-dithianonane (1,9-dimercapto-3,7-dithianonane), 1,13-dimercapto-3,7,11-trithiatridecane (1 ,13-dimercapto-3,7,11-trithiatridecane), glycol di(3-mercaptopropionate), 1,4-dithiane-2,5-diylmethanethiol (1,4-Dithiane-2,5-diyldimethanethiol), 2-mercaptomethyl-1,5-dimercapto-3-thiapentane (2-mercaptomethyl-1,5-dimercapto-3-thiapentane), trimethylol Propane tri(3-mercaptopropionate) (trimethylolpropane tri(3-mercaptopropionate)), 4,8-di (mercaptomethyl)-1,11-dimercapto-3,6,9-trithiaundecane (4,8-di(mercaptomethyl)-1,11-dimercapto-3,6,9-trithiaundecane), 5,9-di(mercaptoethyl)-1,12-dimercapto-3,7,10- Trithiadodecane (5,9-di(mercaptoethyl)-1,12-dimercapto-3,7,10-trithiadodecane), pentaerythritol tetra(3-mercaptopropionate) ), pentaerythritol tetra(mercaptoacetate), 3,6,9,12-Tetrathiatetradecane-1,14-dithiol (3,6,9,12-Tetrathiatetradecane- 1,14-dithiol), 3,6,10,13-Tetrathiapentadecane-1,8,15-trithiol (3,6,10,13-Tetrathiapentadecane-1,8,15-trithiol) It may be one or more types selected from the group consisting of:

In addition, the polyfunctional alcohol-based compound is a compound containing two or more hydroxy groups in one molecule, specifically, a compound having two or more, or three or more, eight or fewer, or four or fewer hydroxy groups in the molecule. It can be. Specific examples include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 2-methyl-2,3-butanediol, and 1,6-hexanediol. dihydric alcohols such as , 1,2-hexanediol, etc.; Trihydric alcohols such as glycerol, trimethylolethane, and trimethylolpropane (TMP); tetrahydric alcohols such as diglycerin, ditrimethylolpropane, pentaerythritol, dipentaerythritol, etc.; Pentahydric alcohols such as L-arabinitol, ribitol, and xylitol; Hexahydric alcohols such as D-glucitol, D-mannitol, and galactitol, and heptahydric alcohols such as trehalose; Examples include octahydric alcohols such as sucrose and maltose, or low molecular weight polyols, and any one or a mixture of two or more of these can be used.

In addition, the multifunctional episulfide-based compound may be a compound containing two or more episulfide groups, that is, a thioepoxy group, in the molecule, and may have an aliphatic, alicyclic, or aromatic skeleton. Specific examples include bis(β-epithiopropylthio)methane, 1,2-bis(β-epithiopropylthio)ethane, 1,3-bis(β-epithiopropylthio)propane, 1,2-bis( β-epithiopropylthio)propane, 1-(β-epithiopropylthio)-2-(β-epithiopropylthiomethyl)propane, 1,4-bis(β-epithiopropylthio)butane, 1, 3-bis(β-epithiopropylthio)butane, 1-(β-epithiopropylthio)-3-(β-epithiopropylthiomethyl)butane, 1,5-bis(β-epithiopropylthio) Pentane, 1-(β-epithiopropylthio)-4-(β-epithiopropylthiomethyl)pentane, 1,6-bis(β-epithiopropylthio)hexane, 1-(β-epithiopropylthio) )-5-(β-epithiopropylthiomethyl)hexane, 1-(β-epithiopropylthio)-2-[(2-β-epithiopropylthioethyl)thio]ethane, 1-(β-epi thiopropylthio)-2-[[2-(2-β-epithiopropylthioethyl)thioethyl]thio]ethane, tetrakis(β-epithiopropylthiomethyl)methane, 1,1,1-tris( β-Epitiopropylthiomethyl)propane, 1,5-bis(β-epithiopropylthio)-2-(β-epithiopropylthiomethyl)-3-thiapentane, 1,5-bis(β-epi) Thiopropylthio)-2,4-bis(β-epithiopropylthiomethyl)-3-thiapentane, 1-(β-epithiopropylthio)-2,2-bis(β-epithiopropylthiomethyl) -4-thiahexane, 1,5,6-tris(β-epithiopropylthio)-4-(β-epithiopropylthiomethyl)-3-thiahexane, 1,8-bis(β-epithiopropyl) thio)-4-(β-epithiopropylthiomethyl)-3,6-dithioctane, 1,8-bis(β-epithiopropylthio)-4,5-bis(β-epithiopropylthiomethyl) )-3,6-Dithioctane, 1,8-bis(β-epithiopropylthio)-4,4-bis(β-epithiopropylthiomethyl)-3,6-dithioctane, 1,8 -bis(β-epithiopropylthio)-2,4,5-tris(β-epithiopropylthiomethyl)-3,6-dithioctane, 1,8-bis(β-epithiopropylthio)- 2,5-bis(β-epithiopropylthiomethyl)-3,6-dithioctane, 1,9-bis(β-epithiopropylthio)-5-(β-epithiopropylthiomethyl)-5 -[(2-β-epithiopropylthioethyl)thiomethyl]-3,7-dithianonane, 1,10-bis(β-epithiopropylthio)-5,6-bis[(2-β- Epithiopropylthioethyl)thio]-3,6,9-trithiadecane, 1,11-bis(β-epithiopropylthio)-4,8-bis(β-epithiopropylthiomethyl)-3, 6,9-Trithiaoundecane, 1,11-bis(β-epithiopropylthio)-5,7-bis(β-epithiopropylthiomethyl)-3,6,9-Trithiaoundecane, 1 ,11-bis(β-epithiopropylthio)-5,7-[(2-β-epithiopropylthioethyl)thiomethyl]-3,6,9-trithioundecane, 1,11-bis( β-epithiopropylthio)-4,7-bis(β-epithiopropylthiomethyl)-3,6,9-trithiaundecane, 1,3-bis(β-epithiopropylthio)cyclohexane, 1,4-bis(β-epithiopropylthio)cyclohexane, 1,3-bis(β-epithiopropylthiomethyl)cyclohexane, 1,4-bis(β-epithiopropylthiomethyl)cyclohexane, Bis[4-(β-epithiopropylthio)cyclohexyl]methane, 2,2-bis[4-(β-epithiopropylthio)cyclohexyl]propane, bis[4-(β-epithiopropylthio) Cyclohexyl] sulfide, 2,5-bis(β-epithiopropylthiomethyl)-1,4-dithiane, 2,5-bis(β-epithiopropylthioethylthiomethyl)-1,4-dithiane An, 1,3-bis(β-epithiopropylthio)benzene, 1,4-bis(β-epithiopropylthio)benzene, 1,3-bis(β-epithiopropylthiomethyl)benzene, 1, 4-bis(β-epithiopropylthiomethyl)benzene, bis[4-(β-epithiopropylthio)phenyl]methane, 2,2-bis[4-(β-epithiopropylthio)phenyl]propane, bis[4-(β-epithiopropylthio)phenyl] sulfide, bis[4-(β-epithiopropylthio)phenyl] sulfone, and 4,4'-bis(β-epithiopropylthio)biphenyl. It may include one or more types selected from.

In the polymerization composition, the molar ratio of functional groups such as thiol groups, hydroxy groups, or episulfide groups to isocyanate groups may be 0.5 to 1.5, or 0.8 to 1.2, or 0.9 to 1.1, but the present invention is not necessarily limited thereto. no.

In addition, the polymerization composition may further include additives such as an internal mold release agent, ultraviolet absorber, urethane reaction catalyst, polymerization initiator, heat stabilizer, color corrector, chain extender, cross-linking agent, light stabilizer, filler, and photosensitizer, if necessary. The content can be appropriately determined within a range that does not impair the discoloration and discoloration inhibition properties of the composition.

For example, the polymerization composition may further include an internal mold release agent to improve release properties from the mold during subsequent product molding.

The internal release agent specifically includes a phosphate release agent, an alkyl phosphate release agent, a fatty acid ester release agent, etc., and any one or a mixture of two or more of these may be used. can be used Among these, a phosphoric acid ester-based mold release agent may be preferably used.

As the phosphoric acid ester-based mold release agent, products such as ZELEC UN™ (manufactured by Stepan Company) can be obtained commercially and used.

The internal release agent may be included in an amount of 0.01% by weight or more, or 0.05% by weight or more, and 10% by weight or less, or 5% by weight or less, based on the total weight of the polymerization composition.

As another example, the polymerization composition may further include an ultraviolet absorber. The UV absorber specifically includes a benzotriazole-based UV absorber and a formamidine-based UV absorber, and any one or a mixture of two or more of these may be used. Among these, a formamidine-based ultraviolet absorber can be preferably used.

The formamidine-based ultraviolet absorbers include Zikasorb R, Zikasorb BS, ZIKA-FA02, ZIKA-FUA, ZIKA-FLS', ZIKA-UVS3, and ZIKA-UVS4 (manufactured by ZIKO); Products such as Biosorb 583 (manufactured by SAKAI CHEMICAL INDUSTRY CO., LTD.) can also be obtained and used commercially.

The ultraviolet absorber may be included in an amount of 0.01% by weight or more, or 0.05% by weight or more, and 0.1% by weight or less, or 0.08% by weight or less, based on the total weight of the polymerization composition.

In addition, the urethane reaction catalyst includes dialkyl tin halide compounds such as dibutyltin dichloride and dimethyltin dichloride; dialkyltin dicarboxylate compounds such as dimethyltin diacetate, dibutyltin dioctanoate, and dibutyltin dilaurate; Dialkyl tin dialkoxide-based compounds such as dibutyltin dibutoxide and dioctyltin dibutoxide; dialkyltin dithioalkoxide-based compounds such as dibutyltin di(thiobutoxide); dialkyl tin oxide-based compounds such as di(2-ethylhexyl)tin oxide, dioctyltin oxide, and bis(butoxydibutyltin) oxide; Alternatively, dialkyl tin sulfide-based compounds may be used, and any one or a mixture of two or more of these may be used.

The urethane reaction catalyst is present in an amount of 0.001% by weight or more, or 0.002% by weight or more, or 0.004% by weight or more, and 0.1% by weight or less, or 0.05% by weight or less, or 0.01% by weight or less, or 0.008% by weight, based on the total weight of the polymerization composition. It may be included in an amount of less than %.

The polymerization composition described above can exhibit excellent discoloration resistance by delaying or suppressing the reaction rate and oligomerization of isocyanate due to the phosphonate-based compound contained in the isocyanate composition, and various substances used to improve workability when manufacturing lenses. Lens color discoloration due to additives can be prevented, and the increase in viscosity of the polymerization composition is suppressed, thereby improving workability, such as reducing filter time during product manufacturing.

As such, the polymerization composition can be used in a wide range of fields due to its excellent physical properties, and can be used in applications that require excellent appearance properties, especially transparency, such as optical adhesives, optical adhesives, spectacle lenses, camera lenses, plastic lenses, and prisms. It is useful as a material for optical products.

According to the present invention, the isocyanate composition in the polymerization composition described above; An article containing a polymer obtained by polymerizing at least one of a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, and a polyfunctional episulfide is provided.

For example, when the composition for polymerization includes a polyfunctional thiol-based compound, the polymerization reaction consists of a urethanization reaction between the isocyanate group in the isocyanate compound and the thiol group in the polyfunctional thiol-based compound. In this way, polyurethane produced by reaction with a polyfunctional thiol-based compound exhibits excellent transparency and is therefore particularly useful in the production of optical products, especially optical lenses such as spectacle lenses and camera lenses.

As another example, when the composition for polymerization includes a polyfunctional alcohol-based compound, the polymerization reaction consists of a urethanation reaction (or condensation polymerization reaction) between an isocyanate in an aromatic diisocyanate and a hydroxy group in the polyfunctional alcohol. In this way, polyurethane produced by reaction with a polyfunctional alcohol-based compound exhibits excellent transparency and excellent adhesive/adhesive properties, so it can be useful as an optical adhesive or optical adhesive.

Additionally, the polymerization reaction may be performed under normal pressure conditions and an inert gas atmosphere such as nitrogen or argon.

In addition, the polymerization reaction is carried out at a temperature range of -15℃ or higher, or 0℃ or higher, and 150℃ or lower, or 120℃ or lower, so that the reaction rate can be easily controlled without concern about discoloration, and reaction efficiency It is also desirable because it can be increased.

The polymerization reaction may be performed under catalyst-free conditions, or may be performed in the presence of a urethanization reaction catalyst as described above. When performed in the presence of a catalyst, the catalyst may be added when mixing a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, or a polyfunctional episulfide-based compound with the isocyanate composition.

In addition, the progress of the polymerization reaction can be predicted by measuring the concentration of isocyanate groups in the polymerization reaction product or measuring the refractive index using the n-dibutyl amine method using a potentiometric titration device. In the present invention, the isocyanate group in the polymerization reaction product can be predicted. This can be carried out until the concentration of the group reaches the calculated value of the isocyanate group remaining after reaction with the polyfunctional thiol-based compound.

As a result of the above polymerization reaction, a polymer, specifically polythiourethane, is produced.

Meanwhile, articles containing the polymer include, specifically, paints such as paints for plastics or paints for automobiles; Coating agents such as film coating agents; various inks; Sealing material; various microcapsules; Artificial leather, such as artificial and synthetic leather; Reaction injection molding (RIM) products; slush powder; Elastic molded articles (spandex); urethane foam; Alternatively, it may be an optical product such as an optical adhesive, an optical adhesive, a spectacle lens, a camera lens, a plastic lens, or a prism. Considering the excellent transparency of the polymerization composition, it may be an optical article, especially an optical adhesive or optical adhesive, or an optical lens such as a spectacle lens or a camera lens.

The article may be manufactured by performing a molding process after the polymerization reaction in the polymerization composition described above, or may be manufactured through a molding process using the polymerization composition. In the latter case, the polymerization reaction occurs simultaneously during the molding process.

For example, in the case of an optical lens, the polymerization composition is injected into a lens mold, then the temperature of the mold is raised to perform a polymerization reaction between the isocyanate-based compound and the polyfunctional thiol-based compound or polyfunctional episulfide-based compound. . At this time, the mold is heated to the temperature range where the urethane polymerization reaction occurs, as described above. After the polymerization reaction is completed, the prepared polymer, specifically polythiourethane, can be separated from the mold to obtain an optical lens.

The polymer prepared from the composition for polymerization according to the present invention, specifically polythiourethane, exhibits excellent transparency and improved workability, and is therefore particularly useful in the production of optical articles, especially optical point/adhesives or optical lenses. .

For example, an optical lens containing a polymer prepared from the composition for polymerization according to the present invention exhibits a YI value of 1.6 or less, or 1.5 or less, when measured according to ASTM E313. Since a lower YI value means superior discoloration resistance, the lower limit is not particularly limited, but may specifically be greater than 0 or greater than 0.1.

Preferred examples are presented below to aid understanding of the present invention. However, the following examples are merely illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that changes and modifications fall within the scope of the attached patent claims.

<이소시아네이트 조성물의 제조><Preparation of isocyanate composition>

실시예 1-1Example 1-1

471 g of 1,2-dichlorobenzene, 32.5 g of m-XDA with a purity of 99.4%, and 0.24 g of 4-hydroxy TEMPO were placed in a flask, and anhydrous hydrochloric acid was injected at a rate of 20 g/hr and stirred at room temperature (23 ± 5°C). . Anhydrous hydrochloric acid was injected and the temperature rose to 50°C. After 4 hours of injection, the formed salt was cooled to room temperature, 43 g of phosgene was added into the reactor, and the reactor temperature was heated to 130°C. From the time of adding phosgene to the end of the reaction, a dry ice-acetone cooler was used to prevent phosgene from leaking out. After the reactor temperature reached 130°C, the reactor temperature was maintained at 125-135°C for 2 hours to ensure that the reaction solution became transparent. After the solution became transparent, the inside of the reactor was cooled to 80°C, nitrogen was blown in, and phosgene was discharged and removed. The reaction solution from which phosgene was removed was subjected to vacuum distillation to remove the solvent, and the product was purified under reduced pressure at a high temperature of 160°C to obtain m-xylylene diisocyanate (m-XDI).

An isocyanate composition was prepared by adding 380 ppm of ethyl methylphosphonate (boiling point: 181°C) to the m-XDI and mixing.

실시예 1-2Example 1-2

An isocyanate composition was prepared in the same manner as in Example 1-1, except that 900 ppm of Mono-2-ethylhexyl(2-Ethylhexyl)phosphonate was added instead of Ethyl methylphosphonate.

실시예 1-3Example 1-3

An isocyanate composition was prepared in the same manner as in Example 1-1, except that 1100 ppm of Monoethyl 3,5-Di-tert-butyl-4-hydroxybenzylphosphonate was added instead of Ethyl methylphosphonate.

실시예 1-4Example 1-4

An isocyanate composition was prepared in the same manner as in Example 1-1, except that 600 ppm of pinacolyl methylphosphonate was added instead of ethyl methylphosphonate.

실시예 1-5Examples 1-5

An isocyanate composition was prepared in the same manner as in Example 1-1, except that 380 ppm of ethyl methylphosphonate and 200 ppm of phenol were added to m-XDI.

실시예 1-6Example 1-6

An isocyanate composition was prepared in the same manner as in Example 1-2, except that 900 ppm of Mono-2-ethylhexyl(2-Ethylhexyl)phosphonate and 200 ppm of phenol were added to m-XDI. Manufactured.

실시예 1-7Example 1-7

The same method as in Example 1-3 was carried out except that 200 ppm of phenol was added along with 1100 ppm of Monoethyl 3,5-Di-tert-butyl-4-hydroxybenzylphosphonate to m-XDI. An isocyanate composition was prepared.

실시예 1-8Examples 1-8

An isocyanate composition was prepared in the same manner as in Example 1-4, except that 600 ppm of pinacolyl methylphosphonate and 200 ppm of phenol were added to m-XDI.

비교예 1-1 Comparative Example 1-1

An isocyanate composition was prepared in the same manner as in Example 1-1, except that ethyl methylphosphonate was not added in Example 1-1.

비교예 1-2Comparative Example 1-2

An isocyanate composition was prepared in the same manner as in Example 1-1, except that ethyl methylphosphonate was not added and 200 ppm of phenol was added.

비교예 1-3Comparative Example 1-3

An isocyanate composition was prepared in the same manner as in Example 1-1, except that 250 ppm of ZELEC™ UN (manufactured by Stepan Company), a phosphoric acid ester compound, was added instead of ethyl methylphosphonate. did.

비교예 1-4Comparative Example 1-4

An isocyanate composition was prepared in the same manner as in Example 1-1, except that 250 ppm of Bis (2-ethylhexyl) phosphate, a phosphoric acid ester compound, was added instead of ethyl methylphosphonate. .

비교예 1-5Comparative Example 1-5

An isocyanate composition was prepared in the same manner as in Example 1-1, except that 250 ppm of phosphoric acid was added instead of ethyl methylphosphonate.

However, precipitates occurred in the prepared isocyanate composition.

비교예 1-6Comparative Example 1-6

An isocyanate composition was prepared in the same manner as in Example 1-1, except that 250 ppm of Ethyl Phosphate (mono and di ester mixture) (DEP) was added instead of Ethyl methylphosphonate. .

<중합용 조성물 및 광학 렌즈의 제조><Manufacture of polymerization composition and optical lens>

실시예 2-1Example 2-1

20.8 g of the isocyanate composition prepared in Example 1-1, 0.04 g of ZELEC™ UN (manufactured by Stepan) as an internal release agent, and 0.04 g of Biosorb™ 583 (manufactured by Sakai Chemical industry Co., Ltd.) as an ultraviolet absorber were mixed in a flask at room temperature. The mixture was stirred and mixed for about 20 minutes.

Add 0.002 g of dibutyltin dichloride to the resulting mixture, stir and mix for 10 minutes, and then 19.2 g of 2,3-bis(2-sulfanyl ethyl sulfanyl)propane-1-thiol (isocyanate in isocyanate compounds) as a polyfunctional thiol-based compound. (based on 1 mole of group, the molar ratio of the thiol group in the polyfunctional thiol compound is 1.0) was added, degassed under 5 mbar conditions and stirred for 1 hour, and a composition for polymerization was prepared.

In addition, the polymerization composition prepared above was filtered through a 1 μm PTFE filter and then injected into a mold consisting of a glass mold and tape. This mold was placed in an oven and the temperature was gradually raised from 10°C to 120°C, and a polymerization reaction was performed for 20 hours. After completion of polymerization, the mold was taken out of the oven and released to obtain a plastic lens. The obtained lens was annealed at 120°C for 6 hours.

실시예 2-2 내지 2-8, 및 비교예 2-1 내지 2-6Examples 2-2 to 2-8, and Comparative Examples 2-1 to 2-6

The polymerization composition and A lens was manufactured.

However, in Comparative Examples 1-3 and 1-4, filter clogging occurred during the filter process after preparing the polymerization composition.

In addition, the isocyanate composition of Comparative Example 1-5 was not suitable for producing a polymerization composition due to the generation of precipitates, so the production of the composition for polymerization and the production of lenses were not carried out.

실험예 1Experimental Example 1

The acidity of the isocyanate compositions prepared in the above examples and comparative examples was measured by the following method.

1. Instruments and reagents

1.1 0.01N KOH standard solution (methanolic): 0.01mol Potassium hydroxide methanolic standard solution (0.01N), DAEJUNG, S/T

1.2 n-Propyl Alcohol: Use diluted hydrochloric acid solution by first adjusting the pH to 4~4.5.

1.3 300ml beaker

1.4 Potentiometric titrator with glass and caromel electrodes: Metrohm E 536

2. Test procedure

2.1 Add 100 ml of n-Propyl Alcohol to a 300 ml beaker and stir.

2.2 Add 15 g of isocyanate composition sample to the beaker containing the n-Propyl Alcohol, cover with a watch glass, and stir for 10 minutes.

2.3 After cooling the beaker, titrate with 0.01N methanolic KOH standard solution in a potentiometric titrator and read the apparent acidity.

Condition: Mode; pH 14, V 0, titration speed 0.05㎖ increasement

Apparent acidity occurs between pH 5.5 and 7.0.

2.4 A blank test is performed in parallel by performing steps 2.1 to 2.3 in the same manner as above, except that the isocyanate composition sample is not added in step 2.2.

3. Calculation

[Equation 1]

Acidity (as HCl) (ppm) = [(AB) × N × f × 36.5 × 10 ⁶ ]/(C × 10 ³ )

In Equation 1 above,

B: Volume of KOH methanol solution consumed in blank titration (ml)

N: normality of KOH methanol solution

f: When the normal concentration of the KOH methanol solution used during measurement changes, it is a correction factor to be the same as a 0.01N KOH methanol solution, and is measured according to ASTM D-1638, TOLOCHIMIE 04-01-68. For 0.01N KOH methanol solution, the f value is 1.

C: Weight of isocyanate composition sample (g)

In Table 1, A, B, and C are as defined in Equation 1 above.

As a result of the experiment, the isocyanate composition of Comparative Example 1-1, in which no additives capable of providing a free acid component by reacting with alcohol were added when preparing the isocyanate composition, showed low acidity.

In addition, Comparative Examples 1-3, in which a commercially available phosphoric acid ester compound was added at the same level as in the Examples when preparing the isocyanate composition, also showed low acidity.

In addition, in the case of Comparative Examples 1-4 and 1-5 in which a phosphoric acid ester compound or phosphoric acid was added instead of the phosphonate compound in the present invention when preparing the isocyanate composition, the acidity was higher than that of Comparative Example 1-3. However, it showed somewhat lower acidity compared to the example.

실험예 2Experimental Example 2

The isocyanate composition prepared in the above examples and comparative examples was refrigerated and stored at a temperature of 15°C for 8 weeks under a nitrogen atmosphere, specifically, 100% by volume of nitrogen in the atmosphere filled with nitrogen with a purity of 99.999%, and stored over time. The increase in oligomer content in the isocyanate composition was confirmed, and storage stability was evaluated from the results.

Specifically, the oligomer content (area%) in the isocyanate composition was determined by performing gel permeation chromatography (GPC) analysis on the isocyanate composition according to the following conditions, and measuring the molecular weight distribution curve (GPC curve) for the isocyanate composition (x-axis: weight) Obtain the log value (log M) of the average molecular weight (M), Y axis: molecular weight distribution (dwt/dlog M) for the log value, and calculate the area of the fraction corresponding to the oligomer out of the total area of the GPC curve as a percentage. indicated. Specifically, the oligomer content (area%) was calculated according to Equation 3 below.

[Equation 3]

Oligomer content (area%) = [E/D] × 100

In Equation 3 above,

D is the total area under the curve in the molecular weight distribution curve (GPC curve) obtained through gel permeation chromatography analysis of the isocyanate composition,

The total area of the GPC curve and the area of the fraction corresponding to the oligomer are each obtained through integration. At this time, the oligomer refers to a polymer with a weight average molecular weight (Mw) of 600 to 2000 g/mol, and the fraction corresponding to the oligomer in the GPC curve is 19.42 ≤ logMw ≤ 22.18.

Equipment used: Agilent

Column: Agilent PL Mixed D, Agilent PLgel 100Å, Agilent PLgel 50Å

Sample concentration: 1wt/vol% in tetrahydrofuran (THF)

Carrier: THF

Detection method: RI

Outflow: 1.0 ml/min

Column temperature: 25℃

Detector: Agilent RI detector

When preparing the calibration curve, standard polystyrene foam with a molecular weight of 104 to 24,600 g/mol was used.

Also, based on the above measurement results, the oligomer content increase rate (%) was calculated according to Equation 2 below.

[Equation 2]

Oligomer content increase rate (%) = [(C _f - Ci)/Ci] × 100

In Equation 2 above,

Ci is the oligomer content (area %) in the isocyanate composition immediately after production,

C _f is the content (area %) of oligomers in the isocyanate composition when the isocyanate composition is stored for 8 weeks at 15°C in a nitrogen atmosphere, specifically in an atmosphere of 100% by volume nitrogen filled with 99.999% purity nitrogen,

The Ci and C _f are each calculated values according to Equation 3 above.

In Table 2, a), the oligomer content in the isocyanate composition was measured in the same manner as above immediately after preparation of the isocyanate composition in Examples and Comparative Examples.

In b), it was difficult to accurately measure the oligomer content due to the generation of precipitates.

In Examples and Comparative Examples, the same m-XDI composition was prepared and then additives were added, so the content of oligomers in the isocyanate composition immediately after preparation was the same.

However, the oligomer content increased over time, and the rate of increase in oligomer content varied depending on the type of additive. Specifically, the increase rate of oligomer content over time in Examples was lower than that in Comparative Examples.

실험예 3Experimental Example 3

(1) White turbidity phenomenon

The isocyanate composition prepared in the above examples and comparative examples was refrigerated and stored at a temperature of 15°C for 12 weeks in a nitrogen atmosphere, specifically an atmosphere of 100% by volume nitrogen filled with nitrogen with a purity of 99.999%, to determine whether white turbidity occurred. was confirmed visually. The observation results were evaluated according to the following criteria and are shown in Table 3.

X: No white clouding phenomenon

O: Occurrence of white turbidity

(2) Haze (%)

The isocyanate compositions prepared in the above examples and comparative examples were refrigerated and stored at 15°C for 8 weeks under a nitrogen atmosphere, and then haze was measured according to ASTM D1003.

Colorimeter: Ultrascan Pro

Light source: C/2

Cell: 10 mm quartz

(3) APHA

The isocyanate compositions prepared in the above examples and comparative examples were refrigerated and stored at a temperature of 15°C in a nitrogen atmosphere for 8 weeks, and then APHA was measured under the following measurement conditions according to the method of ASTM D1209 using HunterLab's Ultrascan Pro. The results are shown in Table 3 below. The smaller the APHA value, the better the discoloration resistance.

Colorimeter: Ultrascan Pro

Light source: C/2

Cell: 10mm quartz

In Table 3 above, “-” means that accurate measurement was not possible.

As a result of the experiment, the isocyanate composition of the example did not exhibit white clouding, and also showed an improved effect compared to the comparative example in terms of discoloration resistance.

실험예 4Experimental Example 4

For the polymerization composition prepared in the above examples and comparative examples, the time (min) required for filtration was measured using a PTFE filter (25 mm Diameter Syringe Filter, manufactured by Whatman) with a pore size of 1.0 μm, and the From the results, the effect of improving workability was evaluated.

Filtration time refers to the time from when 200 g of the polymerization composition passes through the filter to when the passage is completed.

As a result of the experiment, the polymerization composition of Comparative Example 2-1, which showed low acidity because no additives capable of reacting with alcohol to provide a free acid component were added when preparing the isocyanate composition, had a long filtration time.

On the other hand, the polymerization composition of Example 2-1, in which the phosphonate-based compound of Chemical Formula 1 was added when preparing the isocyanate composition, showed a significantly shorter filtration time compared to the comparative example, resulting in improved workability. Confirmed to have it.

On the other hand, the viscosity of the isocyanate composition of Comparative Example 1-3 increased, making it difficult to prepare a polymerization composition, and the filtration time of the polymerization composition of Comparative Example 2-3 could not be measured due to filter clogging in the filter process. .

In addition, in the case of Comparative Example 2-5, the isocyanate composition of Comparative Example 1-5 was not suitable for producing a composition for polymerization due to the generation of precipitates, so it was not proceeded.

실험예 5Experimental Example 5

YI (Yellowness Index) was measured for the lenses manufactured using the polymerization composition in the above Examples and Comparative Examples by the method described below.

However, the isocyanate composition of Comparative Example 1-3 had an increased viscosity, making it difficult to manufacture a composition for polymerization, and as a result, a lens could not be manufactured. In addition, the isocyanate composition of Comparative Example 1-5 was not suitable for producing a composition for polymerization due to the generation of precipitates, so lens production was not carried out.

The results are shown in Table 5 below.

Equipment: Ultrascan Pro, HunterLab

Light source: D65/10

Measurement standard: ASTM E313

In addition, the manufactured lenses were visually checked for defects and evaluated according to the following standards.

X No lens defects

O There is a defective lens, white lines of defective elements are observed on the lens.

As a result of the experiment, it was confirmed that the lens manufactured using the polymerization composition of the example showed a lower YI value compared to the comparative example, and thus had a better discoloration inhibition effect.

On the other hand, when preparing the isocyanate composition, the lenses of Comparative Examples 2-4 and 2-6 using phosphate-based compounds showed high YI, and in particular, the lenses of Comparative Example 2-4 using Bis(2-ethylhexyl) phosphate showed defects. occurred.

실험예 6Experimental Example 6

When manufacturing a lens using the polymerization composition in the above Examples and Comparative Examples, the release property was evaluated according to the following criteria based on the degree of difficulty in separating the lens from the lens mold by hand, and the results are shown in Table 6.

○: Good release property. Easily released without applying force

△: Difficulty in mold release. Force must be applied and does not release easily.

X: Mold damaged. Poor dysplasia

As a result of the experiment, when a lens was manufactured using the polymerization composition of Comparative Example 2-4, it was difficult to release the lens from the lens mold only by applying force. From this, it can be seen that the polymerization composition of Comparative Example 2-4 has poor workability.

Claims

Isocyanate-based compounds, and

Isocyanate composition comprising a phosphonate-based compound represented by the following formula (1):

[Formula 1]

In Formula 1,

R a and R b are each independently a substituted or unsubstituted C 1-20 alkyl group, a substituted or unsubstituted C 6-20 aryl group, a substituted or unsubstituted C 7-30 alkylaryl group, or a substituted or unsubstituted It is a C 7-30 arylalkyl group.
According to paragraph 1,

R a and R b are each independently a C 1-8 alkyl group, a phenyl group, or a benzyl group, and R a and R b are each independently a C 1-6 alkyl group, a phenyl group, a hydroxy group, and a combination thereof. Isocyanate composition, which is substituted with one or more substituents selected from, or is unsubstituted.
According to paragraph 1,

The phosphonate-based compound is ethyl methylphosphonate, pinacolyl methylphosphonate, mono-2-ethylhexyl (2-ethylhexyl) phosphonate, or monoethyl 3,5-di-tert-butyl-4. -Isocyanate composition, which is hydroxybenzylphosphonate.
According to paragraph 1,

An isocyanate composition, wherein the phosphonate-based compound is contained in an amount of 100 to 3,000 ppm based on the total weight of the isocyanate-based compound.
According to paragraph 1,

The isocyanate composition has an acidity of 500 ppm or less.
According to paragraph 1,

An isocyanate composition, wherein the isocyanate-based compound is a diisocyanate containing two isocyanates in the molecule.
According to paragraph 1,

The isocyanate-based compounds include 1,5-pentamethylene diisocyanate, toluene diisocyanate, methylene diphenyl diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, cyclohexylene diisocyanate, and isophorone. An isocyanate composition that is a diisocyanate, o-xylylene diisocyanate, m-xylylene diisocyanate or p-xylylene diisocyanate.
According to paragraph 1,

The isocyanate composition further includes a phenol-based stabilizer.
According to clause 8,

The phenol-based stabilizer includes phenol; dibutylhydroxytoluene; t-butylhydroquinone; butylhydroxyanisole; pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate]; Octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate; N,N'-hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide]; Benzene propanoic acid 3,5-bis(1,1-dimethylethyl)-4-hydroxy C7-C9 side chain alkyl ester; 3,3',3",5,5',5"-hexa-tert-butyl-a,a',a"-(mesitylene-2,4,6-triyl)trip-cresol; ethylene bis (oxyethylene) bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate]; hexamethylene bis[3-(3,5-di-tert-butyl-4-hydroxy) phenyl) propionate]; 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6-(1H, 3H,5H)-Trione; 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate; di-tert-butyl-p-cresol; 2,6-diphenyl-4-octadecyloxyphenol; stearyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate; (3,5-di-tert-butyl-4-hydroxybenzyl)phosphate; thiodiethylene glycol bis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; -Hexamethylene bis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; 1,6-hexamethylene bis[(3,5-di-tert-butyl-4-hydroxy) phenyl)propionamide]; 4,4'-thiobis(6-tert-butyl-m-cresol); 2,2'-methylene bis(4-methyl-6-tert-butylphenol); Methylenebis(4-ethyl-6-tert-butylphenol); bis[3,3-bis(4-hydroxy-3-tert-butylphenyl)butyric acid]glycol ester; 6-tert-butyl-m-cresol); 2,2'-ethylidene bis(4,6-di-tert-butylphenol); 2,2'-ethylidene bis(4-sec-butyl-6-tert); -Butylphenol); 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane; -3-tert-butyl-5-methylbenzyl)phenyl]terephthalate 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene; ; tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane; 2-tert-butyl-4-methyl-6(2-acryloyloxy- 3-tert-butyl-5-methylbenzyl)phenol; 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxa spiro[5.5]undecan; triethylene glycol bis[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate]; 6-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3, 2]dioxaphosphepine; or an isocyanate composition comprising a mixture thereof.
According to clause 8,

The isocyanate composition wherein the phenol-based stabilizer is included in an amount of 5 to 1000 ppm based on the total weight of the isocyanate-based compound.
According to paragraph 1,

The isocyanate composition has an oligomer content increase rate of 600% or less calculated according to Equation 2 below.

[Equation 2]

Oligomer content increase rate (%) = [(C f - Ci)/Ci] × 100

In Equation 2 above,

Ci is the oligomer content (area %) in the isocyanate composition immediately after preparation, calculated through gel permeation chromatography analysis,

C f is the content (area %) of oligomers in the isocyanate composition calculated through gel permeation chromatography analysis after the isocyanate composition was stored at 15°C for 8 weeks under a nitrogen atmosphere.
According to paragraph 1,

The isocyanate composition has an APHA value of 15 or less as measured according to ASTM D1209 after being stored at 15°C for 8 weeks in a nitrogen atmosphere and a haze of 0.5% or less as measured according to ASTM D1003.
An isocyanate composition according to any one of claims 1 to 12, and

Containing at least one of a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, and a polyfunctional episulfide-based compound;

Composition for polymerization.
An article comprising a polymer obtained by polymerizing the isocyanate composition according to any one of claims 1 to 12, and at least one of a polyfunctional thiol-based compound, a polyfunctional alcohol-based compound, and a polyfunctional episulfide-based compound.
According to clause 14,

The article is an optical adhesive, an optical adhesive, or an optical lens.
According to clause 15,

The optical lens has a YI value of 2 or less as measured according to ASTM E313.