POLYMERIZABLE COMPOSITION FOR OPTICAL MATERIAL, POLYMERIZABLE COMPOSITION OF PREPOLYMER FOR OPTICAL MATERIAL, CURED PRODUCT AND METHOD FOR PRODUCING THE OPTICAL MATERIAL

Abstract

A polymerizable composition for an optical material containing two or more different monomers for an optical material and a polymerization catalyst, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, the content of the polymerization catalyst with respect to a total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass, and the viscosity measured by a type B viscometer at 25 °C and 60 rpm is from 10 mPa·s to 1,000 mPa·s.

Description

POLYMERIZABLE COMPOSITION FOR OPTICAL MATERIAL, POLYMERIZABLE COMPOSITION OF PREPOLYMER FOR OPTICAL MATERIAL, CURED PRODUCT AND METHOD FOR PRODUCING THE OPTICAL MATERIAL Technical field of the invention This description relates to a polymerizable composition for an optical material, a polymerizable prepolymer composition for an optical material, a cured product, and a method for producing an optical material. Background of the invention Examples of methods for producing resins used for an optical material for plastic lenses include a casting polymerization method in which a polymerizable composition containing a monomer is poured into a mold and cured with heat. In a casting polymerization method, after formulating a polymerizable composition and degassing, the polymerizable composition is poured into a mold, subjected to heat curing (polymerization reaction), a product is removed from the mold (mold release), and annealing is performed to obtain an optical material (such as a lens or a semi-finished raw part). In heat curing, to improve the quality of an optical material, it is common to carry out a polymerization reaction for several to several tens of hours while the temperature is gradually increased by heating, and specifically, it generally takes 20 to 48 hours. It is known that a large part of the total production process time (for example, 90% of the total time) is spent on polymerization. In the examples in patent document 1, it is described that a cast mold with a polymerizable composition was gradually heated from 10 °C to 120 °C and polymerized in 20 hours to obtain a molded body. In the examples in patent document 2, it is described that a cast mold with a polymerizable composition was gradually heated from 25 °C to 120 °C for 16 hours, and then heated to 120 °C for 4 hours to obtain a molded body. Patent Document 1: WO2014 / 027427 Patent Documents 2: WO2014 / 133111 Brief description of the invention Technical problem As described above, conventionally, it is common in processes to produce an optical material for the polymerization reactions to take place over several hours to several tens of hours (e.g., 20 to 48 hours) while the temperature is gradually increased by heating. However, the long production time of an optical material requires a lengthy operation of MA / a / xíUZI / un ¿uoz ​​production-related equipment, which has been an economic burden and deteriorated labor efficiency. On the other hand, when a polymerization reaction is carried out with a shortened heat polymerization time when producing an optical material by a method as conventionally used, the quality of the optical material is considered to be degraded due to a defect such as the optical material not curing due to insufficient polymerization, or the generation of striations in the optical material even when it cures. As described above, in the production of an optical material, there is a need to maintain the quality of the optical material to be obtained and to shorten the production time of an optical material. One problem that will be solved by one modality of the description is to provide a method for producing an optical material in which the quality of the optical material to be obtained can be maintained and the production time of the optical material can be shortened. One problem to be solved by a variant of the description is to provide a polymerizable composition for an optical material used in a method for producing an optical material in which the quality of the resulting optical material can be maintained and the production time of the optical material can be shortened. Solution to the problem The specific means to solve the problems described above include the following aspects. A first type of description includes the following aspects. < 1> A polymerizable composition for an optical material containing two or more different monomers for an optical material and a polymerization catalyst, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, a content of the polymerization catalyst with respect to a total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass and a viscosity measured by a type B viscometer at 25 °C and 60 rpm is from 10 mPa-s to 1,000 mPa-s. < 2> The polymerizable composition for an optical material according to <1> , where a thixotropy ratio is 1.3 or less. < 3> The polymerizable composition for an optical material according to <1 > or <2> , which contains two or more different monomers for an optical material, a polymerization catalyst and a prepolymer which is a polymer of the two or more different monomers for an optical material and which contains a polymerizable functional group. < 4> The polymerizable composition for an optical material according to any of <1 > to <3> wherein the two or more different monomers for an optical material contain at least one hydrogen-active compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. < 5> The polymerizable composition for an optical material according to any of <1 > to <4> , where the polymerization catalyst satisfies the following condition 1. [Condition 1] - Ea / R is from -7,100 to -2,900. (where Ea is an activation energy calculated from an Arrhenius chart from reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J / mol / K.) < 6> The polymerizable composition for an optical material according to any of <1 > to <5> , wherein the polymerization catalyst contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8 and an organometallic catalyst. < 6-1 > The polymerizable composition for an optical material according to any of <1> to <6> , wherein the polymerization catalyst contains at least one selected from the group consisting of an amine catalyst and an organotin catalyst. < 6-2> The polymerizable composition for an optical material according to any of <1> a <6-1 >, wherein the polymerization catalyst contains at least one selected from the group consisting of 3,5-lutidine, 2,4,6-collidine, triethylenediamine, A / , / V dimethylethanolamine, V-ethylmorpholine, dibutyltin dichloride, dimethyltin dichloride, dibutyltin dilaurate and dibutyltin diacetate. < 7> A polymerizable prepolymer composition for an optical material containing a polymerization catalyst and a prepolymer that is a polymer of two or more different monomers for an optical material and containing a polymerizable functional group, wherein: at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, and a viscosity measured with a type B viscometer at 25 °C and 60 rpm is from 10 mPa-s to 2,000 mPa-s. < 8> The polymerizable composition of prepolymer for an optical material according to <7> , wherein the polymerization catalyst content with respect to a total of 100 parts by mass of the prepolymer ranges from 0.002 parts by mass to 0.50 parts by mass. < 8-1 > The polymerizable composition of prepolymer for an optical material according to <7> or <8> , where a thixotropy ratio is 1.3 or less. < 8-2> The polymerizable prepolymer composition for an optical material according to any of <7> a <8-1 >, where the prepolymer contains an isocyanate group. < 8-3> The polymerizable prepolymer composition for an optical material according to any of <7> to <8-1 >, wherein the prepolymer does not contain substantially any isocyanate group. < 9> The polymerizable prepolymer composition for an optical material according to any of <7> a <8-3>, wherein the two or more different monomers for an optical material include at least one hydrogen-active compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. < 10> The polymerizable prepolymer composition for an optical material according to any of <7> to <9> , where the polymerization catalyst satisfies the following condition 1: [Condition 1] - Ea / R is from -7,100 to -2,900 (where Ea is an activation energy calculated from an Arrhenius chart from reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J / mol / K.) < 11> The polymerizable composition of prepolymer for an optical material according to any of <7> to <10> , wherein the polymerization catalyst contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8 and an organometallic catalyst. < 11-1> The polymerizable prepolymer composition for an optical material according to any of <7> to <11> , wherein the polymerization catalyst contains at least one selected from the group consisting of an amine catalyst and an organotin catalyst. < 11-2> The polymerizable prepolymer composition for an optical material according to any of <7> a <11-1>, wherein the value obtained by subtracting the refractive index B of a prepolymer raw material composition, which is a composition before forming the prepolymer and which is a composition containing two or more different monomers for an optical material and a polymerization catalyst, from the refractive index A of the prepolymer composition for an optical material is greater than 0. < 12> A cured product of the polymerizable composition for an optical material according to any of <1> a <6-2> or the polymerizable prepolymer composition for an optical material according to any of <7> a <11 -2>. < 12-1 > The cured product of the polymerizable composition for an optical material according to <12> Wherein, in the polymerizable composition for an optical material, the two or more different monomers for an optical material include at least one hydrogen-active compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. < 12-2> The cured product of the polymerizable composition for an optical material according to <12> or <12-1 >, wherein, in the polymerizable composition for an optical material, the polymerization catalyst satisfies the following condition 1. [Condition 1] - Ea / R is from -7,100 to -2,900 (where Ea is an activation energy calculated from an Arrhenius chart from reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J / mol / K.) < 12-3> The cured product of the polymerizable composition for an optical material according to any of <12> a <12-2>, wherein, in the polymerizable composition for an optical material, the polymerization catalyst contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8 and an organometallic catalyst. < 12-4> The cured product of the polymerizable composition for an optical material according to any of <12> a <12-3>, wherein, in the polymerizable composition for an optical material, the polymerization catalyst contains at least one selected from the group consisting of an amine catalyst and an organotin catalyst. < 12-5> The cured product of the polymerizable composition for an optical material according to any of <12> a <12-4>, wherein, in the polymerizable composition for an optical material, the polymerization catalyst contains at least one selected from the group consisting of 3,5-lutidine, 2,4,6-collidine, triethylenediamine, A / ,A / -dimethylethanolamine, V-ethylmorpholine, dibutyltin dichloride, dimethyltin dichloride, dibutyltin dilaurate, and dibutyltin diacetate. < 13> A method for producing an optical material, the method comprising: a preparation process for preparing a polymerizable composition for an optical material containing two or more different monomers for an optical material and a polymerization catalyst, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring and the content of the polymerization catalyst with respect to a total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass; and a curing process for curing the polymerizable composition for an optical material by polymerizing the two or more different monomers for an optical material into the polymerizable composition for an optical material. < 14> A method for producing an optical material, the method comprising: a preparation process for preparing a total of 100 parts by mass of two or more different monomers for an optical material and from 0.010 parts by mass to 0.50 parts by mass of a polymerization catalyst; and a prepolymerization process for obtaining, by obtaining a prepolymer by mixing a portion of the two or more different monomers for an optical material and at least a portion of the polymerization catalyst and by polymerizing at least a portion of the portion of the two or more different monomers for an optical material, a mixture containing the prepolymer, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring. < 15> The method for producing an optical material according to <14> The method includes: a process for producing a polymerizable composition for an optical material in which, by further adding at least one residue of the two or more different monomers for an optical material to the mixture containing the prepolymer, a polymerizable composition for an optical material is obtained containing the two or more different monomers for an optical material, the prepolymer, and the polymerization catalyst; and a curing process in which, by curing the two or more different monomers for an optical material in the polymerizable composition for an optical material, an optical material is obtained that is a cured product of the polymerizable composition for an optical material. < 16> The method for producing an optical material in accordance with any of <13> to <15> wherein the two or more different monomers for an optical material include at least one hydrogen-active compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. < 17> The method for producing an optical material in accordance with any of <13> to <16> , where the polymerization catalyst satisfies the following condition 1. [Condition 1] - Ea / R is from -7,100 to -2,900 (where Ea is an activation energy calculated from an Arrhenius chart from reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J / mol / K.) < 18> The method for producing an optical material according to any of <13> to <17> , wherein the polymerization catalyst contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8 and an organometallic catalyst. < 19> The method for producing an optical material in accordance with any of <13> to <18> , wherein the polymerization catalyst contains at least one selected from the group consisting of an amine catalyst and an organotin catalyst. < 20> A cured product of two or more different optical monomers, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, there are no striations of a length of 1.0 mm or more within a radius of 15 mm from a center of the cured product and an amine content, as measured by gas chromatography-mass spectrometry, is from 0.001% by mass to 0.50% by mass. Advantageous effects of the invention According to one modality of the description, a method can be provided for producing an optical material in which the quality of the optical material to be obtained can be maintained and the production time of the optical material can be shortened. According to one embodiment of the description, a polymerizable composition for an optical material can be provided for use in a method for producing an optical material in which the quality of the optical material to be obtained can be maintained and the production time of the optical material can be shortened. According to one embodiment of the description, a method can be provided for producing an optical material in which striations in the optical material to be obtained can be suppressed and the production time of the optical material can be shortened. According to one embodiment of the description, a polymerizable composition can be provided for an optical material used in a method for producing an optical material in which striations in the resulting optical material can be suppressed and the production time of the optical material can be shortened. Description of the modalities In the present, each numerical interval specified using “(from) ... to ... ” represents an interval that includes the numerical values ​​noted before and after “to” as the minimum and maximum values, respectively. In the present, the quantity of each component in a composition means the total quantity of the plurality of substances present in the composition, unless otherwise specified, where there is more than one substance corresponding to each component in the composition. With respect to the stepped numerical intervals described herein, the upper or lower limit value described in one numerical interval may be replaced with the upper or lower limit value of another stepped numerical interval. In the numerical intervals described herein, the upper or lower limit values ​​of the numerical value intervals may be replaced with values ​​described in the examples. In the present, the term “process” includes not only independent processes, but also processes that cannot be clearly distinguished from other processes, as long as a desired purpose of the process is achieved. The description includes a first modality and a second modality. Each modality will be described. - First modality - « Polymerizable composition for an optical material » The polymerizable composition for an optical material of the first modality is a polymerizable composition for an optical material containing two or more different monomers for an optical material and a polymerization catalyst, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, the content of the polymerization catalyst with respect to the total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass, and the viscosity measured by a type B viscometer at 25 °C and 60 rpm is from 10 mPa-s to 1,000 mPa-s. When the polymerizable composition for an optical material of the first type includes the configuration described above, the quality of the resulting optical material can be maintained and the production time of the optical material can be favorably reduced. (Monomer for an optical material) The polymerizable composition for an optical material of the first modality contains two or more different optical material monomers, wherein at least one of the optical material monomers is an isocyanate compound containing an aromatic ring. The monomer for an optical material can be any monomer that is used for optical applications and is not particularly restricted. For example, monomers used to produce an optical material can be used that has any of the following properties. An optical material obtained using monomers for an optical material can have a total light transmittance of 10% or more. The total light transmittance of the optical material described above can be measured according to JIS K 7361-1 (1997). An optical material obtained using a monomer for an optical material may have a haze (or total haze) of 10% or less, preferably 1% or less, and even more preferably 0.5% or less. The haze of the optical material is a value measured at 25 °C using a haze meter [TC-HIII DPK manufactured by Tokyo Denshoku Co., Ltd.] in accordance with JIS-K7105. An optical material obtained using monomers preferably has a refractive index of 1.58 or higher. An optical material obtained using a monomer may have a refractive index of 1.80 or lower, or 1.75 or lower. The refractive index of the optical material can be measured according to JIS K7142 (2014). The shape of an optical material obtained by using a monomer for an optical material is not particularly limited and can be a plate, cylinder, rectangle, or similar. Examples of a monomer for an optical material include a polymerizable monomer that polymerizes when using the polymerization catalyst described later. Specific examples of a polymerizable monomer include an isocyanate compound, a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. The two or more different monomers for an optical material preferably contain at least one hydrogen-active compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. [Isocyanate compound] Examples of isocyanate compounds include aliphatic isocyanate compounds, alicyclic isocyanate compounds, aromatic isocyanate compounds, and heterocyclic isocyanate compounds, and one or more of these compounds are used in a mixture. These isocyanate compounds may include a dimer, a trimer, or a prepolymer. Examples of such isocyanate compounds include those illustrated in International Publication No. 2011 / 055540. In addition, as an isocyanate compound, a halogen-substituted (e.g., chlorine-substituted or bromine-substituted), alkyl-substituted, alkoxy-substituted, carbodiimide-modified, urea-modified, or burette-modified compound of the above-described compound; A modified prepolymer-type compound of the compound described above and a nitro-substituted compound, a polyhydric alcohol or the like; or a dimerization or trimerization reaction product of the compound described above, may also be used. These compounds can be used alone or in a mixture of two or more of the same types. In the present, an alicyclic isocyanate compound refers to an isocyanate compound that may contain an alicyclic structure and may contain a structure other than an alicyclic structure, such as a heterocyclic structure. An aromatic isocyanate compound refers to an isocyanate compound that contains an aromatic structure and may contain any one or a combination of an aliphatic structure, an alicyclic structure, and a heterocyclic structure. A heterocyclic isocyanate compound refers to an isocyanate compound that contains a heterocyclic structure and does not contain an alicyclic structure and an aromatic structure. An aliphatic isocyanate compound refers to an isocyanate compound that does not contain an aromatic structure, an alicyclic structure, and a heterocyclic structure. The isocyanate compound preferably contains at least one selected from the group consisting of an aliphatic isocyanate compound, an alicyclic isocyanate compound, an aromatic isocyanate compound, and a heterocyclic isocyanate compound. At least one of the monomers for an optical material in the first embodiment is an isocyanate compound containing an aromatic ring. Specific examples of an isocyanate compound containing an aromatic ring include an aromatic isocyanate compound, and more specific examples thereof include an isocyanate compound in which an isocyanate group is directly attached to an aromatic ring, and an isocyanate compound in which an isocyanate group is attached to a benzylic position of an aromatic ring. An isocyanate compound containing an aromatic ring is preferred over an isocyanate compound that does not contain aromatic rings (e.g., an alicyclic isocyanate compound, or an aliphatic isocyanate compound), since the activity of an isocyanate group is greater, which facilitates the polymerization reaction. A monomer for an optical material may contain an isocyanate compound other than an isocyanate compound containing an aromatic ring, i.e., an isocyanate compound that does not contain aromatic rings. When the monomer for an optical material contains an isocyanate compound that does not contain aromatic rings and an isocyanate compound that contains an aromatic ring, from the point of view of controlling a polymerization reaction, the ratio of isocyanate compounds that do not contain aromatic rings to isocyanate compounds that contain an aromatic ring in terms of the molar ratio of the isocyanate groups is preferably within the range from 3:7 to 0:10 and more preferably within the range from 2:8 to 0:10. Isocyanate compounds other than those containing an aromatic ring are not specifically restricted, and examples include isocyanate compounds containing an aromatic ring. When the monomer for an optical material contains both an isocyanate compound without aromatic rings and an isocyanate compound containing an aromatic ring, the number of moles of isocyanate groups in the isocyanate compound without aromatic rings is preferably less than the number of moles of isocyanate groups in the isocyanate compound containing an aromatic ring. In the first embodiment, from the point of view of maintaining the quality of an optical material and reducing the production time of the optical material, the isocyanate compound preferably contains at least one selected from the group consisting of isophorone diisocyanate, 2,5-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, 2,6-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, m-xylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, dicyclohexylmethane diisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane, 1,4-bis(isocyanatomethyl)cyclohexane, 1,6-hexamethylene diisocyanate, and 1,5-pentamethylene diisocyanate, more preferably containing at least one selected from the group consisting of isophorone diisocyanate, 2,5-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, 2,6-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, m-xylene diisocyanate, 2,4-toluenediisocyanate, 2,6-toluenediisocyanate, dicyclohexylmethane diisocyanate and 1,3-bis(isocyanatomethyl)cyclohexane, even more preferably containing at least one selected from the group consisting of m-xylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, dicyclohexylmethane diisocyanate and 1,3-bis(isocyanatomethyl)cyclohexane and particularly preferably containing m-xylene diisocyanate. [Active hydrogen compound] Examples of the active hydrogen compound include a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. As the active hydrogen compound, an oligomer of the active hydrogen compound or a halogen-substituted compound of the active hydrogen compound (e.g., a chlorine-substituted compound or a bromine-substituted compound) can be used. Active hydrogen compounds can be used alone or in a mixture of two or more types of them. (Polythiol compound containing two or more mercapto groups) Examples of the polythiol compound containing two or more mercapto groups include compounds as illustrated in WO2016 / 125736. In the first embodiment, from the point of view of maintaining the quality of the optical material and reducing the manufacturing time of the optical material, the polythiol compound preferably contains at least one species selected from the group consisting of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, pentaerythritol tetrakis(3-mercaptopropionate), bis(mercaptoethyl)sulfide, pentaerythritol tetrakis(2-mercaptoacetate), 2,5-bis(mercaptomethyl)-1,4-dithia, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 4,6-bis(mercaptomethylthio)-1,3-dithiethane and 2-(2,2-bis(mercaptomethylthio)ethyl)-1,3-dithiethane, more preferably containing at least one selected from the group consisting of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaocteane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, pentaerythritol tetrakis(3-mercaptopropionate), pentaerythritol tetrakis(2-mercaptoacetate) and 2,5-bis(mercaptomethyl)-1,4-dithia, and even more preferably contains at least one selected from the group consisting of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9trithiaundecane and pentaerythritol tetrakis(3-mercaptopropionate)., (Polythiol compound containing three or more mercapto groups) Examples of the active hydrogen compound also include a polythiol compound containing three or more mercapto groups. When the polymerizable composition for an optical material of the first modality includes a polythiol compound containing three or more mercapto groups as an active hydrogen compound, from the point of view of promoting a polymerization reaction, it is preferable to contain a compound (also referred to as compound (N1)) in which at least one mercapto group among the three or more mercapto groups contained in the polythiol compound containing three or more mercapto groups is replaced by a group represented by the following formula (N1). In Formula (N1), * represents a bonding composition. In the polymerizable composition for an optical material of the first modality, from the point of view of easily adjusting a polymerization reaction, when the peak area is measured by high-performance liquid chromatography, the peak area of ​​the compound (N1) with respect to the peak area 100 of the polythiol compound containing three or more mercapto groups is preferably 3.0 or less and more preferably 1.5 or less. When the peak area is measured by high-performance liquid chromatography, from the point of view of promoting a polymerization reaction, the peak area of ​​the compound (N1) with respect to the peak area 100 of the polythiol compound containing three or more mercapto groups is preferably 0.01 or more. The peak area by high-performance liquid chromatography can be measured by the method described in paragraph 0146 and similar paragraphs of WO2014 / 027665. (Hydroxythiol compound containing one or more mercapto groups or one or more hydroxyl groups) Examples of thiol compounds containing a hydroxy group include 2-mercaptoethanol, 3-mercapto-1,2-propanediol, glycerin bis(mercaptoacetate), 4-mercaptophenol, 2,3-dimercapto-1-propanol, pentaerythritol tris(3-mercaptopropionate), pentaerythritol tris(thioglycolate), but are not limited to these illustrated compounds. (Polyol compound containing two or more hydroxyl groups) Examples of polyol compounds include one or more aliphatic or alicyclic alcohols. Examples include a linear or branched aliphatic alcohol, an alicyclic alcohol, and an alcohol to which at least one alcohol selected from the group consisting of ethylene oxide, propylene oxide, and ε-caprolactone has been added. More specific examples include the compounds as illustrated in WO2016 / 125736. The polyol compound described above is preferably at least one selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, 1,2-cyclopentanediol, 1,3-cyclopentanediol, 1,2-cyclohexanediol, 1,3-cyclohexanediol, and 1,4-cyclohexanediol. (Amine compound) Examples of amine compounds include a primary polyamine compound such as ethylenediamine, 1,2- or 1,3-diaminopropane, 1,2-, 1,3- or 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,10-diaminodecane, 1,2-, 1,3- or 1,4-diaminocyclohexane, o-, m-, or p-diaminobenzene, 3,4- or 4,4'-diaminobenzophenone, 3,4- or 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl sulfide, 3,3' or 4,4'-diaminodiphenyl sulfone, 2,7diaminofluorene, 1,5-, 1,8- or 2,3-diaminonaphthalene, 2,3-, 2,6- or 3,4-diaminopyridine, 2,4- or 2,6diaminotoluene, m- or p-xylenediamine, isophorondiamine, diaminomethylbicycloheptane, 1,3- or 1,4diaminomethylcyclohexane, 2- or 4-aminopiperidine, 2- or 4-aminomethylpiperidine, 2- or 4-aminoethylpiperidine, Naminoethylmorpholine or N-aminoethylmorpholine; a compound of monofunctional secondary amine such as diethylamine, dipropylamine, di-n-butylamine, di-sec-butylamine, di-isobutylamine, di-n-pentylamine, di-3-pentylamine, di-n-pentylamine, di-3-pentylamine, dihexylamine, dioctylamine, di(2-ethylhexyl)amine, methylhexylamine, diallylamine, M-methylallylamine, piperidine, pyrrolidine, diphenylamine, / V-methylamine, / V-ethylamine, dibenzylamine, Λ / methylbenzylamine, N-methylbenzylamine, A / -ethylbenzylamine, dicyclohexylamine, / V-methylaniline, A / -ethylaniline, dinaphthylamine, 1-methylpiperazine or morpholine;y a secondary polyamine compound such as Λ / ,Λ / '-dimethylenediamine, Λ / ,Λ / '-dimethyl-1,2diaminopropane, Λ / , A / -dimethyl-1,3-diaminopropane, N, A / -dimethyl-1,2-diaminobutane, N, A / -dimethyl-1,3diaminobutane, N, N -dimethyl-1,4-diaminobutane, Λ / ,Λ / -dimethyl-1,5-diaminopentane, N, N -dimethyl-1,6diaminohexane, N,Λ / '-dimethyl-1,7-diaminoheptane, N,N-diethylethyndiamine, N,N-diethyl-1,2-diaminopropane, Λ / ,Λ / '-diethyl-l ,3-diaminopropane, Λ / ,Λ / '-diethyl-1,2-diaminobutane, N,A / '-diethyl-1,3-diaminobutane, Λ / ,Λ / '-diethyl-1,4-diaminobutane, Λ / ,Λ / '-diethyl-1,5-diaminopentane, Λ / ,Λ / '-diethyl-1,6-diaminohexane, Λ / ,Λ / '-diethyl-1,7-diaminoheptane, piperazine, 2-methylpiperazine, 2,5-dimethylpiperazine, 2,6-dimethylpiperazine, homopiperazine, 1,1-di-(4-piperidyl)methane, 1,2-di-(4-piperidyl)ethane, 1,3-di-(4-piperidyl)propane, 1,4-di-(4-piperidyl)butane tetramethylguanidine. Among the above, from the point of view of increasing the thermal resistance and refractive index of a cured product, an active hydrogen compound preferably includes a polythiol compound containing two or more mercapto groups. The content of the polyethylene compound containing two or more mercapto groups with respect to the total mass of the hydrogen-active compound is preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more. In the hydrogen-active compound in the first embodiment, the total content of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaondecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaondecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaondecane and pentaerythritol tetrakis(3-mercaptopropionate) with respect to the total mass of the hydrogen-active compound is preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more. In the composition, the molar ratio (NCO groups / (OH groups + SH groups)) of isocyanate groups (NCO groups) in the isocyanate compound to the sum of hydroxyl groups (OH groups) and mercapto groups (SH groups) in the active hydrogen compound is preferably 0.8 or more, more preferably 0.85 or more, and still more preferably 0.9 or more. In the composition, the molar ratio (NCO groups / (OH groups + SH groups)) of isocyanate groups (NCO groups) in the isocyanate compound to the sum of hydroxyl groups (OH groups) and mercapto groups (SH groups) in the hydrogen-active compound is preferably 1.2 or less, more preferably 1.15 or less, and even more preferably 1.1 or less. <Polymerization catalyst> The polymerizable composition for an optical material of the first modality contains at least one polymerization catalyst. The polymerization catalyst is not particularly restricted and, for example, a basic catalyst, an organometallic catalyst, a zinc carbamate, an ammonium salt, a sulfonic acid, or similar catalysts can be used. The polymerization catalysts described above can be used alone or two or more of them can be used in an appropriate combination. (Basic catalyst) Examples of the basic catalyst include an amine catalyst (including an imidazole catalyst). Examples of the same include a tertiary amine catalyst such as triethylenediamine, A / ,A / -d¡meth¡lethanolamine, triethylamine or N -ethylmorpholine; 2-methylpyrazine, pyridine, a-picoline, β-picoline, ypicoline, 2,6-lutidine, 3,5-lutidine, 2,4,6-collidine, 3-chloropyridine, N, / V-diethylaniline, N,M-dimethylaniline, hexamethylenetetra, quinoline, isoquinoline N, / V-dimethyl-p-toluidine, A / ,A / -d¡methylpiperazine, quinaldine, 4-methylmorpholine, triallylamine, trioctylamine, 1,2-dimethylimidazole and 1-benc¡l-2-met¡l¡m¡dazole. Among the above, an amine catalyst is preferred as a basic catalyst. Examples of the amine catalyst include 3,5-lutidine; 2,4,6-collidine; and a tertiary amine catalyst such as triethylenediamine, A / ,A / -dimethylethanolamine, triethylamine or / V-ethylmorpholine. The amine catalyst described above preferably contains at least one selected from the group consisting of 3,5-lutidine, 2,4,6-collidine, triethylenediamine, N,N-dimethylethanolamine and V-ethylmorpholine. The basic catalyst also preferably contains a compound represented by the following formula (2) and / or a compound represented by the following formula (3). In formula (2), Ri represents a linear alkyl group having from 1 to 20 carbon atoms, a branched alkyl group having from 3 to 20 carbon atoms, a cycloalkyl group having from 3 to 20 carbon atoms, or a halogen atom, and a plurality of Ri can be the same or different. Q represents a carbon atom or a nitrogen atom, m is an integer from 0 to 5. r2 N(3) R< R3 In formula (3), R2, R3 and R4 each independently represent a linear alkyl group having from 3 to 20 carbon atoms, a branched alkyl group having from 3 to 20 carbon atoms, a cycloalkyl group having from 3 to 20 carbon atoms, an allyl group or a hydrocarbon group containing a hydroxyl group. The basic catalyst preferably has a pKa value of 1 or higher, more preferably has a pKa value of 3 or higher, and even more preferably has a pKa value of 4 or higher. The basic catalyst preferably has a pKa value of 9 or less and more preferably has a value of 8 or less. The pKa (acid dissociation index) value can be measured by, for example, (a) a method described in The Journal of Physical Chemistry vol. 68, number 6, page 1560 (1964), or (b) a method using a potentiometric automatic titrator (AT-610 (trade name) or similar) manufactured by Kyoto Electronics Industry Co., Ltd., and (c) the acid dissociation index described in the Chemical Handbook edited by The Chemical Society of Japan (38th revised edition, published by Maruzen Corporation on June 25, 1984) can be used. (Organometallic catalyst) Examples of organometallic catalysts include an organotin catalyst; an organic acid salt of iron, nickel, zinc, or the like; an acetylacetonate complex; a catalyst composition comprising a carboxylic acid metal compound and a quaternary ammonium salt compound; a catalyst composition comprising a bicyclic tertiary amine compound and a quaternary ammonium salt; and a metal catalyst in which an alkoxy group, carboxyl group, or the like is coordinated with titanium or aluminum. Of the organometallic catalysts mentioned above, an organotin catalyst is preferable. Examples of organotin catalysts include dibutyltin dichloride (DBC), dimethyltin dichloride (DMC), dibutyltin dilaurate (DBTDL), and dibutyltin diacetate. The organotin catalyst described above preferably contains at least one selected from the group consisting of dibutyltin dichloride, dimethyltin dichloride, dibutyltin dilaurate, and dibutyltin diacetate. The polymerization catalyst preferably contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8, and an organometallic catalyst. The polymerization catalyst also preferably contains at least one selected from the group consisting of an amine catalyst and an organotin catalyst. The polymerization catalyst preferably contains at least one selected from the group consisting of 3,5-lutidine, 2,4,6-collidine, triethylenediamine, A / .M-dimethylethanolamine, triethylamine, netylmorpholine, dibutyltin dichloride, dimethyltin dichloride, dibutyltin dilaurate, and dibutyltin diacetate. The polymerizable composition for an optical material of the first modality has a polymerization catalyst content with respect to a total of 100 parts by mass of the two or more different monomers for an optical material from 0.010 parts by mass to 0.50 parts by mass. The polymerization catalyst content in the first modality is a large amount compared to a conventional method for producing an optical material. This allows the heat of reaction (or heat of self-heating) of the polymerizable composition for an optical material to be generated in a short time when the monomers for an optical material in a polymerizable composition polymerize in a curing process. As a result, a polymerization reaction can be favorably promoted, and a high-quality optical material can be obtained in a shorter time than before, while the viscosity of the polymerizable composition is increased and thermal convection, which is presumed to cause striations, is suppressed, as described later. When the polymerization catalyst content of two or more different monomers in an optical material is 0.010 parts by mass or more, up to a total of 100 parts by mass, the polymerization reaction can be effectively promoted, resulting in a high-quality optical material that can be obtained in a short time. This effective polymerization reaction also improves mold release properties when removing a cured product from a mold. From the point of view of the above, the polymerization catalyst content to the total of 100 parts by mass of the two or more different monomers for an optical material is preferably 0.02 parts by mass or more, and more preferably 0.03 parts by mass or more. When the polymerization catalyst content with respect to the total of 100 parts by mass of the two or more different monomers for an optical material is 0.50 parts by mass or less, for example, the handling property can be improved when pouring the polymerizable composition for an optical material into a mold. From the point of view described above, the polymerization catalyst content to the total of 100 parts by mass of the two or more different monomers for an optical material is preferably 0.20 parts by mass or less, more preferably 0.10 parts by mass or less, and even more preferably 0.09 parts by mass or less. The polymerization catalyst content can be appropriately set depending on the type of polymerization catalyst, the type and amount of monomers (isocyanate compounds, hydrogen-active compounds, other components and the like) to be used, and a desired shape of a molded body. The polymerization catalyst content range described above can be changed appropriately depending on the type of monomer for an optical material and polymerization catalyst. The polymerization catalyst preferably satisfies the following Condition 1. [Condition 1] -Ea / R is from -7,100 to -2,900. (where Ea is an activation energy calculated from an Arrhenius chart based on reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J / mol / K.) When the polymerization catalyst satisfies condition 1, variations in the polymerization rate can be suppressed in the polymerization and curing process of the polymerizable composition, and as a result, optical distortion and striations can be suppressed, and an optical material with a superior appearance can be obtained. The value of Ea is calculated by the following method. The value of Ea is calculated by carrying out a process to acquire physical properties in which, when a composition 1 containing a polymerization reactant and a predetermined amount of a polymerization catalyst is heated and held at a plurality of temperatures, physical properties 1a derived from a functional group of the polymerization reactant are acquired before heating and physical properties 1b derived from a residual functional group of the polymerization reactant are acquired after heating for a predetermined period of time; a residual functional group rate calculation process in which a residual functional group rate 1 at a plurality of temperatures is calculated from properties 1a and physical properties 1b; a reaction rate constant calculation process in which a reaction rate constant 1 at a plurality of temperatures is calculated from the residual functional group rate 1 based on a reaction rate equation; and an adjustment process in which an activation energy Ea1 and a frequency factor A1 are calculated from the reaction rate constants 1 at a plurality of temperatures by an Arrhenius chart. The calculated Ea is used to determine whether the polymerization catalyst satisfies condition 1 or not. The specific aspects of the method for calculating the value of Ea and the method for determining whether or not the polymerization catalyst satisfies condition 1 are the same as those described in WO2020 / 256057. (Other additives) The polymerizable composition for an optical material of the first type may include an optional additive. Examples of the optional additive include a photochromic compound, an internal mold release agent, a blue coloring agent, and an ultraviolet light absorbing agent. (Photochromic compounds) Photochromatic compounds are compounds whose molecular structure is reversibly changed by irradiation with light at a specific wavelength, and whose absorption characteristics (absorption spectrum) are changed accordingly. Examples of the photochromic compound used in the first modality include a compound whose absorption characteristics (absorption spectrum) change depending on the specific wavelength of light. In the first modality, the photochromic compound is not particularly restricted, and any conventionally known compound that can be used for photochromic lenses can be selected and used as appropriate. For example, one or more of the following compounds can be used depending on the desired tint: a spiropyran compound, a spirooxazine compound, a fulgidic compound, a naphthopyran compound, and a bisimidazole compound. (Internal mold release agent) Examples of internal mold release agents include acid phosphate esters. Examples of acid phosphate esters include phosphoric acid monoester and phosphoric acid diester, which can be used individually or in a mixture of two or more of these types. (Blue coloring agent) Examples of a blue coloring agent include a substance that has an absorption band in the orange-to-yellow wavelength region of the visible light range and is used to adjust the tint of an optical material made of resin. Specific examples of a blue coloring agent also include a substance that exhibits a blue-to-violet color. (Ultraviolet light absorber) Examples of the ultraviolet light-absorbing agent to be used include a benzophenone ultraviolet light-absorbing agent such as 2,2'-dihydroxy-4-methoxybenzophenone; a triazine ultraviolet light-absorbing agent such as 2-[4-[(2-hydroxy-3-dodecyloxypropoxy)oxy]-2-hydroxyphenyl]4,6bis(2,4-dimethylphenyl)-1,3,5-thazine; and a benzotriazole ultraviolet light-absorbing agent such as 2(2 / 7-benzotriazol-2-yl)-4-methylphenol, or 2-(2 / 7-benzotriazol-2-yl)-4-tert-octylphenol, and preferred examples thereof include a benzotriazole ultraviolet light-absorbing agent such as 2-(2 / 7-benzotriazol-2-yl)-4-tert-octylphenol or 2-(5-chloro-2 / 7-benzotriazol-2-yl)-4-methyl-6-tert-butylphenol. These ultraviolet light absorbers may be used alone or in combination with two or more of the same. (Goo) From the point of view of suppressing striations, the polymerizable composition for an optical material of the first modality has a viscosity measured with a type B viscometer at 25 °C and 60 rpm of 10 mPa-s or more, and preferably 40 mPa-s or more, more preferably 70 mPa-s or more, even more preferably 80 mPa-s or more, particularly preferably 100 mPa-s or more, and even more preferably 120 mPa-s or more. From the point of view of maintaining favorable handling properties when molding an optical material into desired shapes, the polymerizable composition for an optical material of the first modality has a viscosity measured with a type B viscometer at 25 °C and 60 rpm of 1,000 mPa-s or less, preferably 700 mPa-s or less and more preferably 400 mPa-s or less. The viscosity of the polymerizable composition for an optical material of the first type can be adjusted depending on the application of a cured product to be obtained. For example, when using a mold for exceptional lenses to obtain a cured product, the end (or injection hole) is narrow (e.g., from 1 mm to 3 mm) and therefore the polymerizable composition for an optical material of the first modality preferably has a viscosity of 10 mPa-s to 100 mPa-s from the point of view of suppressing striations. On the other hand, when using a mold for ordinary lenses other than exceptional lenses to obtain a cured product, the end face (or injection hole) is wide (e.g., from 5 mm to 15 mm) and therefore the polymerizable composition for an optical material of the first type preferably has a viscosity from 10 mPa-s to 1,000 mPa-s and more preferably from 100 mPa-s to 1,000 mPa-s from the point of view of suppressing striations. By increasing the viscosity of the polymerizable composition for an optical material, thermal convection due to the temperature difference between the inside and outside of the composition can be suppressed when heat is applied to the composition from the outside, thereby reducing striations resulting from thermal convection. However, when the amount of catalyst is small, the thickening rate during polymerization is insufficient, and the maximum temperature difference is not large enough to suppress thermal convection. Therefore, the temperature cannot be increased rapidly in a short time. Furthermore, the time required to complete polymerization is also longer. Furthermore, the description allows the viscosity of the composition as a whole to increase more rapidly by increasing the amount of catalyst to an optimal range, taking into account the reactivity of the isocyanate compound containing an aromatic ring. As a result, thermal convection due to the rapid temperature increase can be suppressed while controlling the irregularity in polymerization, and polymerization can proceed in a short time. (Thixotropy relationship) The polymerizable composition for an optical material of the first modality preferably has a thixotropy ratio of 1.3 or less, more preferably 1.2 or less, and even more preferably 1.1 or less. When the thixotropy ratio of the polymerizable composition for an optical material of the first type is 1.3 or less, the composition can be rapidly filled into a polymerization container, such as a mold as described later, and thermal convection during polymerization can be suppressed to further prevent the formation of striations or similar defects in the monomer for an optical material. As a result, the formation of striations or similar defects in the resulting optical material can be suppressed, and a favorable quality can be maintained. The polymerizable composition for an optical material of the first modality preferably has a thixotropy ratio of 0.9 or greater, more preferably 0.95 or greater, and even more preferably 1.0 or greater. The thixotropy ratio is calculated by dividing a viscosity ηι measured with a type B viscometer at 25 °C and a rotation speed of 6 rpm by a viscosity η2 measured at a rotation speed of 60 rpm. The thixotropy ratio can be reduced, for example, by reducing the molecular weight of two or more monomers for an optical material, by restricting the degree of polymerization of a prepolymer below a certain level, or by reducing the ratio of the structure that gives elasticity in a monomer. The polymerizable composition for an optical material of the first modality preferably contains two or more different monomers for an optical material, a polymerization catalyst and a prepolymer that is a polymer of two or more different monomers for an optical material and contains a polymerizable functional group. A prepolymer is a polymer of two or more different monomers for an optical material and contains a polymerizable functional group. A cured product, obtained by polymerizing a prepolymer and two or more different monomers for an optical material, can be used as an optical material. Examples of prepolymer include a polymer in which two of the monomers for an optical material do not polymerize at an equivalent 1:1 ratio, and a polymer in which two of the monomers for an optical material polymerize at an unbalanced equivalent ratio. The polymerizable functional group described above is a functional group capable of polymerization with another polymerizable functional group, and specific examples of these include a functional group containing an active hydrogen, such as an isocyanate group or a mercapto group as described below. Polymerization at an equivalent ratio of 1:1 means, for example, that when polymerizing ινΐΛ / a / zuz i / un ouoz using an isocyanate compound and a polythiol compound, the isocyanate groups of the isocyanate compound and mercapto groups of the polythiol compound polymerize at a molar ratio of 1:1. "Polymerizable prepolymer composition for an optical material" The polymerizable prepolymer composition for an optical material of the first modality is a polymerizable prepolymer composition for an optical material containing a prepolymer that is a polymer of two or more different monomers for an optical material and containing a polymerizable functional group, a polymerization catalyst, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, and the viscosity measured with a type B viscometer at 25 °C and 60 rpm is from 10 mPa-s to 2,000 mPa-s. The specific examples, preferred specific examples, preferred aspects and the like for monomers for an optical material of polymerizable compositions of prepolymer for an optical material and polymerization catalysts are the same as the specific examples, preferred specific examples, preferred aspects and the like for monomers for an optical material and polymerization catalysts described in the section on polymerizable compositions for an optical material. The prepolymer definition of the polymerizable prepolymer composition for an optical material is the same as the prepolymer definition described in the section on polymerizable composition for an optical material. The specific examples, preferred specific examples, preferred aspects and likenesses of aromatic ring-containing isocyanate compounds contained as monomers for an optical material of the polymerizable prepolymer composition for an optical material and viscosity are the same as the specific examples, preferred specific examples, preferred aspects and likenesses described in the section on the polymerizable composition for an optical material. The polymerizable prepolymer composition for an optical material of the first modality preferably has a polymerization catalyst content with respect to a total of 100 parts by mass of the two or more different monomers for an optical material from 0.002 parts by mass to 0.50 parts by mass. When the polymerization catalyst content of two or more different monomers in an optical material is 0.002 parts by mass or more, up to a total of 100 parts by mass, the polymerization reaction can be favorably promoted, resulting in a high-quality optical material that can be obtained in a short time. This favorable promotion of the polymerization reaction also improves mold release properties when removing a cured product from a mold. From the point of view described above, the polymerization catalyst content to the total of 100 parts by mass of the two or more different monomers for an optical material is preferably 0.001 parts by mass or more, more preferably 0.050 parts by mass or more, and even more preferably 0.070 parts by mass or more. When the polymerization catalyst content to the total of 100 parts by mass of two or more different monomers for an optical material is 0.50 parts by mass or less, for example, the handling property can be improved when pouring the polymerizable composition for an optical material into a mold. From the point of view described above, the polymerization catalyst content to the total of 100 parts by mass of the two or more different monomers for an optical material is preferably 0.15 parts by mass or less, and more preferably 0.10 parts by mass or less. (Thixotropy relationship) The thixotropy ratio of the polymerizable prepolymer composition for an optical material of the first modality is preferably 1.3 or less, more preferably 1.2 or less, and even more preferably 1.1 or less. When the thixotropy ratio of the polymerizable prepolymer composition for an optical material of the first modality is 1.3 or less, the composition can be rapidly filled into a polymerization container, such as a mold as described below, and thermal convection during polymerization can be suppressed to further prevent the generation of striations or similar features in the monomer for an optical material. As a result, the generation of striations and similar features in the resulting optical material can be suppressed, and a favorable quality can be maintained. The polymerizable composition for an optical material of the first modality preferably has a thixotropy ratio of 0.9 or greater, more preferably 0.95 or greater, and even more preferably 1.0 or greater. The method for measuring the thixotropy ratio is as described above. From the point of view of the property of manipulation of the composition, in the polymerizable composition of a prepolymer for an optical material of the first modality, a prepolymer may preferably contain an isocyanate group. In other words, it is preferable that not all the isocyanate groups contained in the prepolymer are polymerized and only some of the isocyanate groups are polymerized, and it is preferable that 70% or more of the isocyanate groups contained in the isocyanate compound used to produce a prepolymer composition remain unpolymerized. When the prepolymer contains an isocyanate group, in other words, the prepolymer contains more isocyanate compound than other monomers for an optical material that can be polymerized with the isocyanate compound, the viscosity of the polymerizable prepolymer composition for an optical material can be kept low when the viscosity of the other monomer for an optical material is high, which facilitates the handling of the composition. In particular, when one or more monomers selected from the group consisting of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane and pentaerythritol tetrakis(3-mercaptopropionate) are contained as the other monomers for an optical material, a prepolymer preferably contains an isocyanate group from the point of view of the handling property. In the polymerizable composition of a prepolymer for an optical material of the first modality, it is also preferable that a prepolymer does not contain substantially any isocyanate group. “A prepolymer does not contain substantially any isocyanate group” means that almost all of them preferably contain 0.01% by mass or more. From the point of view of improving the handling property of the polymerizable composition for an optical material, the amine content in the cured product of the first modality is preferably 0.50% by mass or less, more preferably 0.20% by mass or less, and even more preferably 0.10% by mass or less. The amine content described above is the amine content measured by gas chromatography-mass spectrometry of the dichloromethane composition obtained by dispersing a cured material in dichloromethane and by ultrasonic extraction. From the point of view of reducing streaks, when using an organotin catalyst, the cured product of the first modality preferably has a tin content of 0.01% by mass or more, more preferably 0.02% by mass or more, and even more preferably 0.03% by mass or more. From the point of view of improving the handling property of the polymerizable composition for an optical material, the tin content of the cured product of the first modality is preferably 0.1% by mass or less, more preferably 0.05% by mass or less, and even more preferably 0.3% by mass or less. The method for measuring the amine content in a cured product is as follows. 200 mg of a powder cured product using a metal file and 3 mL of dichloromethane were placed in a centrifuge tube (volume: 10 mL), ultrasonically extracted at room temperature for 10 minutes using an ultrasonic cleaner (manufactured by IUCHI Corporation, US-4) and centrifuged at 4,000 rpm for 10 minutes using a centrifuge (manufactured by KUBOTA Corporation, 2410 small benchtop centrifuge). The supernatant is collected and the residue is dispersed again in 3 mL of dichloromethane and subjected to the centrifugation and ultrasonic extraction described above (hereafter also referred to as “residue extraction”). After performing the above residue extraction two more times, dichloromethane was added to the resulting supernatant liquid to make the total volume 10 mL. The 10 mL of supernatant obtained are filtered and analyzed by gas chromatography-mass spectrometry (also referred to as GC-MS) (GC-MS system: manufactured by Agilent, 6890GC / 5973N MSD, column: CP-Sil 8 CB for amine (0.25 mm ID × 30 m FT = 0.25 pm)) to obtain the amine-derived peak area value. A calibration curve is prepared from the obtained amine-derived peak area value and the amount of amine to determine the amine content in the cured material. The amine described above means an amine compound that can be used as a polymerization catalyst, or an amine compound derived from the amine compound described above. Particularly in optical applications where optical transparency is required, the degree of opacity of the cured product of the first modality is preferably less than 50 and more preferably less than 35. The degree of opacity is measured by the following method. Light from a light source (e.g., a LUMINAR ACE LA-150A manufactured by HAYASHI-REPIC CO., LTD.) is transmitted through a cured product in a darkened environment. An image of the light transmitted through the cured product is input into an image processing device (e.g., an image processing device manufactured by Ube Information Systems Inc.). Shading processing is performed on the input image, the degree of shading in the processed image is quantified for each pixel, and the value calculated as the average of the numerical values ​​of the degree of shading in the respective pixels is used as the degree of opacity. The cured product of the first modality preferably has no striations with a length of 1.0 mm or more within a radius of 15 mm from the center of a cured product and more preferably has no striations with a length of 1.0 mm or more within and outside a radius of 15 mm from the center of a cured product. The cured product of the first modality may be more specifically a cured product of two or more different optical monomers, wherein at least one of the two or more different optical material monomers is an isocyanate compound containing an aromatic ring, in which there are no striations of a length of 1.0 mm or more within a radius of 15 mm from the center of the cured product and the amine content, as measured by gas chromatography-mass spectrometry, is from 0.001% by mass to 0.50% by mass. The two or more different optical monomers and isocyanate compounds containing an aromatic ring are as described above. In the cured product of the description, the two or more different optical monomers may contain an isocyanate compound other than an isocyanate compound containing an aromatic ring. When the two or more different optical monomers include an isocyanate compound that does not have aromatic rings and an isocyanate compound that contains an aromatic ring, from the point of view of controlling a polymerization reaction, the ratio of the isocyanate compound that does not have aromatic rings to the isocyanate compound that has an aromatic ring, in terms of the molar ratio of the isocyanate groups, is preferably within the range from 3:7 to 0:10 and more preferably within the range from 2:8 to 0:10. « Method of producing optical material » The method for producing an optical material of the first type includes the following production method A and production method B. < Production Method A > A production method A includes a preparation process for preparing a polymerizable composition for an optical material containing two or more different monomers for an optical material and a polymerization catalyst, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, and the content of the polymerization catalyst to the total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass; a casting process in which the viscosity of the polymerizable composition for an optical material, measured with a type B viscometer at 25 °C and 60 rpm, is adjusted from 10 mPa-s to 1,000 mPa-s and poured into a mold; and a curing process in which the polymerizable composition for an optical material is cured by polymerizing two or more different monomers for an optical material into the polymerizable composition for an optical material in the mold. When production method A includes the preparation process described above, the viscosity adjustment process described above, and the curing process described above, the quality of the resulting optical material can be maintained, and the production time of an optical material can be reduced. Production method A may include the preparation process described above, the viscosity adjustment process, and the curing process described above, in the order mentioned. In the polymerizable composition for an optical material prepared using production method A, the polymerization catalyst content, relative to the total of 100 parts by mass of the two or more different monomers for the optical material, ranges from 0.010 parts by mass to 0.50 parts by mass. This polymerization catalyst content is a significant amount compared to conventional production methods for optical materials. This allows the heat of reaction (or heat of self-heating) of the polymerizable composition for an optical material to be generated in a short time when the monomers for an optical material are polymerized in the polymerizable composition for an optical material in the curing process. Since the heat of reaction described above can be used to promote a polymerization reaction of monomers for an optical material into a polymerizable composition for an optical material, a high-quality optical material can be obtained in a shorter time than before. Conventionally, a polymerizable composition for an optical material has been heated primarily to generate a polymerization reaction, whereas in production method A, heating the polymerizable composition for an optical material is not necessarily required. Since production method A also utilizes self-heating of a composition, polymerization can proceed without excessive dependence on heat supply from an external source and thus, together with the increase in the viscosity of the composition as described below, heat inequality and heat convection in the polymerizable composition for an optical material can be suppressed and striation generation can be suppressed. In this description, striations are a condition in which the refractive index of a particular portion differs from the surrounding normal refractive index. Striations can also be described as a condition that is detrimental to a desired application of an optical material. Striations in an optical material are a type of defect. < Preparation process > Production method A includes a process for preparing a polymerizable composition for an optical material containing two or more different monomers for an optical material and a polymerization catalyst, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, the content of the polymerization catalyst with respect to the total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass. The preparation process can be a process to simply prepare a pre-produced polymerizable composition for an optical material, or it can be a process to produce a polymerizable composition for an optical material. The preparation process is not particularly restricted as long as the polymerizable composition for an optical material contains two or more different monomers for an optical material and a polymerization catalyst. For the polymerizable composition for an optical material, prepared products can be used, or at least two or more different monomers for an optical material and a polymerization catalyst can be mixed and prepared. The mixing method described above is not particularly restricted and any known method may be used. The temperature at which each of the components described above is mixed is not particularly restricted and is preferably 30 °C or lower and more preferably room temperature (25 °C) or lower. From the perspective of the shelf life of the polymerizable composition for an optical material being prepared, the temperature can preferably be set even below 25 °C. However, when the solubility of an additive, such as an internal mold release agent, and each of the components described above is unfavorable, the temperature of each of the components described above can be raised in advance to dissolve the additive in each of the components described above. Each of the components described above is preferably mixed under dry inert gas to prevent moisture from entering the polymerizable composition for an optical material. The preparation process is preferably a process for producing a polymerizable composition for an optical material by premixing a portion of the two or more different monomers for an optical material with the polymerization catalyst and then further mixing the remainder of the two or more different monomers for an optical material. This prevents the polymerization of a portion of the monomers for two or more different optical materials and the remainder of the monomers for two or more different optical materials until the mixture containing a portion of the monomers described above for two or more different optical materials and the polymerization catalyst described above is mixed with a mixture that does not contain the polymerization catalyst described above and contains the remainder of the monomers described above for two or more different optical materials. Therefore, the polymerization start time can be adjusted by performing the preparation processes in the order described above. This, for example, can improve the handling properties when injecting the polymerizable composition for an optical material into a mold. In the preparation process, after the polymerization catalyst is premixed with a portion of the monomers for two or more different optical materials, the remainder of the monomers described above for two or more different optical materials can be mixed in a single step or divided into a plurality of steps. Examples of a specific aspect of the preparation process include the following aspect. First, a portion of a monomer for an optical material and an additive (e.g., an internal mold release agent) are charged to prepare a blended liquid. After stirring this blended liquid for one hour at 25 °C to fully dissolve each component, a further portion of the remaining monomer for the optical material is charged, and the mixture is stirred to create a uniform solution. Defoaming is performed on this solution to obtain a first blended liquid. Next, the remaining monomers for an optical material and a catalyst are stirred at 25 °C for 30 minutes to dissolve them completely to obtain a second mixed liquid. Then, the first mixed liquid and the second mixed liquid are blended to obtain a polymerizable composition for an optical material as a uniform solution. < Viscosity Adjustment Process > Production method B includes a casting process in which the viscosity of the polymerizable composition for an optical material, measured with a type B viscometer at 25 °C and 60 rpm, is adjusted from 10 mPa-s to 1,000 mPa-s and the composition is cast into a mold. By adjusting the viscosity of the polymerizable composition for an optical material within the range described above and by casting the composition, the viscosity of the polymerizable composition for an optical material to be produced in the process to produce the polymerizable composition for an optical material can be made within an appropriate range from the point of view of suppressing striations in an optical material to be obtained. From the point of view described above, the viscosity of the polymerizable composition for an optical material is 10 mPa-s or greater and preferably 40 mPa-s or greater, more preferably 70 mPa-s or greater, even more preferably 80 mPa-s or greater, particularly preferably 100 mPa-s or greater, and even more preferably 120 mPa-s or greater. From the point of view of maintaining a favorable handling property when molding the optical material into a desired shape, the viscosity of the polymerizable composition for an optical material is 1,000 mPa-s or less, preferably 700 mPa-s or less and more preferably 400 mPa-s or less. The method for adjusting the viscosity of the polymerizable composition for an optical material is not restricted. For example, the viscosity of the polymerizable composition for an optical material can be adjusted by adding a high viscosity compound, heating, stirring, or other methods. < Healing process > ινΐΛ / a / zuz i / un Production method A includes a curing process to cure the polymerizable composition for an optical material by polymerizing the two or more different monomers for an optical material into the polymerizable composition for an optical material in a mold. Since production method A includes a curing process, the polymerizable composition for an optical material can be polymerized and an optical material can be produced. Conventionally, when a polymerization reaction is carried out, the polymerization reaction is generated by heating the polymerizable composition for an optical material. The polymerizable composition for an optical material in production method A can promote the polymerization reaction of the monomers for an optical material by increasing the heat of reaction (or heat of self-heating) associated with the polymerization reaction. Therefore, in production method A, the polymerizable composition for an optical material is not necessarily heated, but it can be heated. In other words, in the curing process of production method A, the polymerizable composition for an optical material can be cured by polymerization by leaving the polymerizable composition for an optical material to remain immobile. The environment in which a curing process takes place is not particularly restricted, and a mold can be heated and cured from the outside. However, from the standpoint of short-time polymerization while improving optical quality such as striations, the process is preferably one in which the polymerizable composition for an optical material is cured by allowing it to remain stationary in a closed system. By placing the polymerizable composition for an optical material in an enclosed space, the heat generated by the composition's self-heating can be prevented from escaping. This allows the heat generated by self-heating to be retained within the enclosed space, promoting the polymerization reaction more efficiently and enabling the production of an optical material in a shorter time. Examples of closed system space include a thermally insulated environment. A thermally insulated environment refers to an environment in which heat is retained inside and heat conduction between the inside and outside is suppressed. An environment in which heat conduction between the inside and outside is suppressed means an environment in which the heat conductivity between the inside and outside of a closed system is such that the polymerizable composition for an optical material can be cured when the polymerizable composition for an optical material is placed even within the closed system. A thermally insulated environment can be created, for example, by using a thermally insulating material. Specifically, by placing the polymerizable composition for an optical material in a thermally insulated container made of thermally insulating material, heat can be retained within the thermally insulated container and heat conduction between the inside and outside can be suppressed. The thermal conductivity of the thermally insulating material is preferably 0.50 W / mK or less, more preferably 0.10 W / mK or less, and even more preferably 0.05 W / mK or less. The density of the thermally insulating material is preferably 10 kg / m3 or greater, more preferably 15 kg / m3 or greater, and even more preferably 20 kg / m3 or greater. In “thermal insulation” or “thermally insulated environment” in production method A, it is preferable to heat a thermally insulated reaction vessel to a thermostatic state (thermostatic reaction vessel) within a range that does not interfere with a polymerization reaction due to the heat of reaction of the polymerizable composition for an optical material or excessively promote the polymerization reaction of the polymerizable composition for an optical material by external heating. This allows the ambient temperature in the reaction vessel (thermostatic reaction vessel) in which a mold is placed to be maintained in a heat retention state or a thermostatic state depending on the increased temperature due to the self-heating of monomers for an optical material, or similar, thereby promoting the polymerization reaction in a more favorable manner. As a thermally insulated environment, for example, a thermally insulated reaction vessel or a thermostatically insulated reaction vessel can be used as described above. For example, thermally isolated polymerization in a thermally isolated environment using a thermally insulated reaction vessel (thermostatic reaction vessel) can be performed by the following procedure when a mold into which a monomer has been injected is placed in a vacuum container that is a thermally insulated reaction vessel. The inner surface of the vacuum container is lined with a material that has thermal insulation and heat retention properties, such as urethane foam or cork, and the mold into which the monomer has been injected is wrapped with a material such as a cloth if necessary. The monomer-injected mold is then allowed to remain stationary in the vacuum container described above. The curing process described above can be a process for curing the polymerizable composition for an optical material by allowing the polymerizable composition for an optical material to remain immobile without heating from the outside. As described above, in production method A, the polymerizable composition for an optical material does not necessarily need to be heated. To heat from the outside, a device can be used, which may increase the economic burden. Production method A can reduce the economic burden because the optical material can be produced using a simpler method. The curing process described above is preferably a process in which the polymerizable composition for an optical material is cured by allowing the composition to remain motionless for from 2 to 10 hours. According to conventional methods, a polymerization reaction is generally carried out over several hours to several tens of hours (for example, from approximately 20 hours to 48 hours) while the temperature is gradually raised by heating. When the time for the polymerization reaction is short, an optical material cannot be obtained or the quality of an optical material is degraded because the polymerizable composition for an optical material does not cure completely. However, according to production method A, an optical material can be produced in a short time while maintaining the quality of the final product. Specifically, an optical material can be produced by allowing the polymerizable composition to remain immobile for 10 hours or less. From the above point of view, it is more preferable to allow the polymerizable composition for an optical material to remain immobile for 8 hours or less in the curing process. From the point of view of obtaining an optical material that has undergone a polymerization reaction and has cured well, it is preferably allowed that the polymerizable composition for an optical material remains immobile for 2 hours or more and more preferably allowed that it remains immobile for 5 hours or more. In the curing process, a microwave irradiation process can be provided in which a microwave is irradiated to the polymerizable composition for an optical material for a predetermined period of time, if necessary. Examples of one aspect of the healing process include one aspect that includes the following process a and process b. Process a: The polymerizable composition for an optical material is injected (cast molded) into a mold (into a mold cavity). Process b: The mold into which the polymerizable composition for the optical material is injected is allowed to remain motionless in an enclosed space for a predetermined period of time to undergo thermally isolated polymerization. (Process a) First, the polymerizable composition is injected into a mold (mold) held in place by a gasket or tape. At this point, depending on the physical properties required to obtain an optical material, it is preferable to perform a defoaming treatment under reduced pressure or a filtration treatment under reduced pressure, or a similar process, if necessary. (Process b) Although the polymerization conditions are not limited, it is preferable to adjust the conditions according to the composition of the polymerizable composition for an optical material, the type and amount of catalyst to be used, and the shape of a mold. The injection mold containing the polymerizable composition for an optical material can be allowed to remain motionless in a thermally isolated environment for 2 to 4 hours for polymerization. In process b, if necessary, a heating process can be added after the thermally isolated polymerization process in which the mold injected with the polymerizable composition for an optical material is allowed to remain motionless for a predetermined period of time in a thermally isolated environment. In process b, if necessary, in parallel with the process to allow the mold injected with the polymerizable composition for an optical material to remain motionless in a thermally isolated environment (thermally isolated polymerization), the mold injected with the polymerizable composition for an optical material may be heated continuously or intermittently to a temperature that does not exceed the self-heating emitted by the polymerizable composition for an optical material in the thermally isolated polymerization process, or the inside of the thermally isolated reaction vessel may be heated to maintain the ambient temperature in the thermally isolated reaction vessel. < Annealing process > Production method A may include, if necessary, an annealing process in which a cured polymerizable composition for an optical material is annealed. The temperature at which the annealing process is carried out is usually from 50 to 150 °C, and is preferably from 90 to 140 °C, and is more preferably from 100 to 130 °C. < Other processes > Production method A may include other processes if necessary. Examples of other processes include an injection process in which the polymerizable composition for an optical material is injected into a mold in the case of producing an optical material using a mold. <Applications of an optical material> The optical material in production method A can be used for plastic lenses, prisms, optical fibers, information recording substrates, filters, light-emitting diodes, and the like. Among the above, the optical material in the first modality can be used appropriately for plastic lenses and is more suitable for plastic lenses for glasses. < Production Method B > Production method B is a method for producing an optical material, the method comprising: a preparation process for preparing a total of 100 parts by mass of two or more different monomers for an optical material and from 0.010 parts by mass to 0.50 parts by mass of a polymerization catalyst; and a prepolymerization process for obtaining a prepolymer by mixing a portion of the two or more different monomers for an optical material and at least a portion of the polymerization catalyst and by polymerizing at least a portion of the two or more different monomers for an optical material, a mixture containing the prepolymer, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring. Production method B includes a preparation process and a pre-polymerization process, which eliminates striations in an optical material to be obtained and reduces the production time of an optical material. Production method B preferably includes, in addition to the preparation process and prepolymerization process described above, a process for producing a polymerizable composition for an optical material in which, by further adding at least the remainder of the two or more different monomers for an optical material to the mixture containing the prepolymer, a polymerizable composition for an optical material is obtained containing the two or more different monomers for an optical material, the prepolymer, and the polymerization catalyst; and a curing process in which, by curing the two or more different monomers for an optical material in the polymerizable composition for an optical material, an optical material is obtained that is a cured product of the polymerizable composition for an optical material. Production method B includes, in addition to the preparation process and the prepolymerization process, a process for producing a polymerizable composition for an optical material and a curing process, which can more favorably suppress striations in an optical material to be obtained and can more favorably reduce the production time of an optical material. In the polymerizable composition for an optical material prepared using production method A, the polymerization catalyst content, relative to the total of 100 parts by mass of the two or more different monomers for the optical material, ranges from 0.010 parts by mass to 2.0 parts by mass. As with production method A, this polymerization catalyst content is substantial compared to conventional production methods for optical materials. Therefore, as in the case of production method A, a high-quality optical material with suppressed striations can be obtained in a shorter time than before. As in the case of production method A, heating the polymerizable composition for an optical material is not necessarily required in production method B. By including a preparation process, a prepolymerization process, a process for producing a polymerizable composition for an optical material, and a curing process, production method B can suppress convection in a mold where a polymerization reaction takes place and can suppress the generation of striations in a cured product to be obtained. Production method B includes a prepolymerization process, which can more favorably maintain the storage stability of a mixture containing the prepolymer (e.g., a polymerizable composition for an optical material) compared to cases without prepolymerization. For example, when a mixture containing a prepolymer is stored for a certain period of time, a polymerization reaction in the mixture can be suppressed. In other words, a longer shelf life can be ensured. < Preparation process > Production method B includes a preparation process in which a total of 100 parts by mass of two or more different monomers for an optical material and from 0.010 to 0.50 parts by mass of polymerization catalyst. In the preparation process, a total of 100 parts by mass of two or more different monomers are prepared for an optical material and from 0.010 to 0.50 parts by mass of polymerization catalyst. In other words, production method B uses a polymerization catalyst from 0.010 to 0.50 parts by mass for a total of 100 parts by mass of two or more different monomers for an optical material. By using a polymerization catalyst of 0.010 parts by mass or more to 100 parts by mass of two or more different monomers for an optical material, a polymerization reaction can be favorably promoted, resulting in a high-quality optical material with suppressed striations in a short time. Favorably promoting a polymerization reaction also improves mold release properties when removing a cured product from a mold. From the point of view described above, a polymerization catalyst is used, with respect to 100 parts by mass of two or more different monomers for an optical material, preferably to 0.015 parts by mass or more, and more preferably to 0.030 parts by mass or more. The polymerization catalyst content range described above can be changed appropriately depending on the type of monomer for an optical material and polymerization catalyst. For example, when a monomer for an optical material contains m-xylene diisocyanate, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane and the polymerization catalyst contains 3,5-lutidine, the polymerization catalyst is used, with respect to 100 parts by mass of two or more different monomers for an optical material, preferably at 0.015 parts by mass or more and more preferably at 0.020 parts by mass or more. MR-71 For example, when a monomer for an optical material contains m-xylene diisocyanate and 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, and the polymerization catalyst contains 3,5-lutidine, the polymerization catalyst is used, with respect to 100 parts by mass of two or more different monomers for an optical material, preferably at 0.010 parts by mass or more and more preferably at 0.015 parts by mass or more. By using the polymerization catalyst of 0.50 parts by mass or less for 100 parts by mass of two or more different monomers for an optical material, for example, the handling property can be improved when the polymerizable composition for an optical material is injected into a mold. From the point of view described above, the polymerization catalyst is used, with respect to 100 parts by mass of two or more different monomers for an optical material, preferably at 0.09 parts by mass or less, more preferably at 0.07 parts by mass or less, and even more preferably at 0.05 parts by mass or less. The amount of polymerization catalyst can be appropriately set depending on the type of polymerization catalyst, the type and amount of monomers (isocyanate compounds, hydrogen-active compounds, other components and the like) to be used and the desired shape of a molded body. < Prepolymerization process > Production method B includes a prepolymerization process to obtain a prepolymer by mixing a portion of two or more different monomers for an optical material and at least a portion of a polymerization catalyst and by polymerizing at least a portion of the two or more different monomers for an optical material, a mixture containing the prepolymer. The inventors considered that the convection caused by the uneven temperature distribution in a mold where a polymerization reaction takes place is one of the causes of striations in a cured product that will be obtained. Therefore, the inventors focused on the fact that when a portion of monomers for an optical material is prepolymerized to produce a prepolymer, and a polymerizable composition for an optical material contains the prepolymer, it increases the viscosity of the polymerizable composition for an optical material. This can suppress convection in a mold. Production method B can reduce the temperature difference between the inside and outside of a mold by preventing self-heating from escaping to the outside. In combination with the viewpoints described above, it is assumed that production method B is capable of suppressing striations in a cured product to be obtained. Production method B can obtain a prepolymer with an excellent shelf life by including all of one or two or more different optical material monomers, some of the other optical material monomers different from the one described above, and all or part of a polymerization catalyst in a prepolymerization process. The aspects of “a portion of two or more different monomers for an optical material” are not particularly restricted. For example, “portion of two or more different monomers for an optical material” may be partial quantities of respective two or more different monomers for an optical material. A “portion of two or more different optical material monomers” can be all of one or more of the two or more different optical material monomers. In the prepolymerization process, the polymerization catalyst can be used in a portion or in its entirety. When a portion of the polymerization catalyst is used, the aspects of “portion of polymerization catalyst” are not particularly restricted, as is the case with “portion of two or more different monomers for an optical material”. For example, “portion of polymerization catalyst” can be a quantity of a portion of the polymerization catalyst. When using a portion of the polymerization catalyst as the polymerization catalyst, from the point of view of ensuring a long service life, the portion of the polymerization catalyst in 100 parts by mass of the polymerization catalyst is preferably from 5 to 80 parts by mass, more preferably from 10 to 60 parts by mass and even more preferably from 15 to 50 parts by mass. From the point of view of ensuring a long service life, a portion of the two or more monomers for an optical material in 100 parts by mass of the two or more monomers for an optical material is preferably from 5 to 95 parts by mass, more preferably from 20 to 80 parts by mass and even more preferably from 30 to 70 parts by mass. Examples of specific aspects of the prepolymerization process are described below, but the prepolymerization process in production method B is not restricted to the following aspects. (Aspect a) The prepolymerization process of aspect a, is a process in which a portion of two or more different monomers for an optical material and all of the polymerization catalyst are mixed and at least a portion in the portion of two or more different monomers for an optical material is polymerized to obtain a prepolymer, thereby obtaining a mixture containing the prepolymer. In aspect a, the portion of two or more different monomers for an optical material is preferably composed of all of one of the two or more different monomers for an optical material and a portion of another monomer for a different optical material than the monomer for an optical material. (Aspect b) The prepolymerization process of aspect b, is a process in which a portion of two or more different monomers for an optical material and a portion of a polymerization catalyst are mixed and at least a portion in the portion of two or more different monomers for an optical material is polymerized to obtain a prepolymer, thereby obtaining a mixture containing the prepolymer. When production method B includes the prepolymerization process of aspect b, the process for producing a polymerizable composition for an optical material described below is a process in which at least the residue of two or more different monomers for an optical material and the residue of a polymerization catalyst are added to a mixture containing a prepolymer to obtain a polymerizable composition for an optical material containing two or more different monomers for an optical material, the prepolymer and the polymerization catalyst. In Aspect b, it is preferable that the two or more different optical material monomers include an isocyanate compound, that a portion of the two or more different optical material monomers includes a portion of the isocyanate compound, and that the remainder of the two or more different monomers for an optical material includes the remainder of the isocyanate compound. < Viscosity Adjustment Process > Production method B preferably further includes a viscosity adjustment process to adjust the viscosity of a mixture containing a prepolymer from 30 mPa-s to 2000 mPa-s after the prepolymerization process and before the process to produce a polymerizable composition for an optical material. When the viscosity of a mixture containing a prepolymer is within the range described above, from the perspective of suppressing striations in the resulting optical material, the viscosity of a polymerizable composition for an optical material produced in the process can be achieved within an appropriate range. As a result, striations in the resulting optical material can be suppressed. From the point of view described above, the viscosity of a mixture containing a prepolymer is preferably from 40 mPa-s to 2,000 mPa-s, and more preferably from 50 mPa-s to 1,800 mPa-s. Viscosity is measured using a type B viscometer under the conditions of 25 °C and 60 rpm (revolutions per minute). The methods for adjusting the viscosity of a mixture containing a prepolymer are not particularly restricted. For example, the viscosity of a mixture containing a prepolymer can be adjusted by methods such as the addition of a high viscosity compound, heating, and stirring. There is no particular limit on the temperature at which a mixture containing a prepolymer is prepared, as long as the temperature is high enough to obtain the prepolymer through a polymerization reaction. For example, the temperature could be from 20 °C to 50 °C, or from 25 °C to 45 °C. The stirring time for preparing a mixture containing a prepolymer is not specifically limited, provided that the stirring time is long enough to obtain the prepolymer through a polymerization reaction. For example, the time could range from 30 minutes to 5 hours or from 1 hour to 5 hours. Specifically, the method for preparing a mixture containing a prepolymer can be a method for preparing a mixture containing a prepolymer by stirring under conditions of 40 °C for 3 hours while adjusting the viscosity. < Process for producing the polymerizable composition for an optical material > Production method B includes a process for producing a polymerizable composition for an optical material in which, by adding at least the remainder of two or more different monomers for an optical material to a mixture containing a prepolymer, a polymerizable composition for an optical material is obtained containing the two or more different monomers for an optical material, the prepolymer, and the polymerization catalyst. The process for producing a polymerizable composition for an optical material is a process in which at least the residue of two or more different monomers for an optical material and the residue of a polymerization catalyst are added to a mixture containing a prepolymer to obtain a polymerizable composition for an optical material containing two or more different monomers for an optical material, the prepolymer and the polymerization catalyst. This prevents the polymerization of the prepolymer and the remainder of the two or more different monomers described above for an optical material until the mixture containing the prepolymer and the remainder of the two or more different monomers described above for an optical material are mixed. Therefore, by carrying out the process to produce a polymerizable composition for an optical material in an appropriate time, for example, the handling property can be improved when the polymerizable composition for an optical material is injected into a mold. In the process for producing a polymerizable composition for an optical material, when adding the residue of at least two or more different monomers for an optical material to a mixture containing a prepolymer, the residue of two or more different monomers for an optical material can be mixed in a single step or divided into a plurality of steps. The “remainder of two or more different monomers for an optical material” means the remainder of two or more different monomers for an optical material with respect to the “portion of two or more different monomers for an optical material” in the prepolymerization process. The “remainder of two or more different monomers for an optical material” may be monomers for an optical material that have functional groups that polymerize with respect to the polymerizable functional groups of the prepolymer, and where the amount of functional groups that polymerize with respect to the polymerizable functional groups of the prepolymer described above is an amount (or equivalent amount) that can polymerize with substantially all of the polymerizable functional groups of the prepolymer. From the point of view of improving the optical uniformity of a composition for an optical material, the remainder of the two or more different monomers for an optical material preferably contains monomers of the same type as the monomers for an optical material that constitute the prepolymer. The temperature at which each of the components described above is mixed is not particularly restricted and is preferably 30 °C or lower and more preferably room temperature (25 °C) or lower. In some cases, the temperature at which each component is mixed may preferably be even lower than 25 °C. However, when the solubility of an additive, such as an internal mold release agent, and each of the components described above is not favorable, the temperature of each of the components described above may be raised in advance to dissolve the additive described above in each of the components described above. Examples of specific aspects of the process for producing a polymerizable composition for an optical material include the following aspects. First, a blended liquid is prepared by loading an additive (e.g., an internal mold release agent) into a mixture containing a prepolymer. This blended liquid is stirred at 25 °C for 1 hour to fully dissolve each component and then degassed to obtain a first blended liquid. The remaining monomers for an optical material and, if necessary, the remaining polymerization catalyst are stirred at 25 °C for 30 minutes to dissolve them completely to obtain a second mixed liquid. Then, the first mixed liquid and the second mixed liquid are blended and degassed after stirring to obtain a polymerizable composition for an optical material as a uniform solution. < Pumping process > Production method B may further include a pumping process for pumping a polymerizable composition for an optical material into a cast mold after the process for producing a polymerizable composition for an optical material and before the curing process. The pumping process can be a process in which the polymerizable composition for the optical material is pumped into the casting mold while being remixed in a stationary mixer. The pumping process can be a process for pumping the polymerizable composition for the optical material into the casting mold while remixing the composition with a dynamic mixer. This can eliminate the non-uniformity in the distribution of the polymerizable composition for an optical material as the polymerizable composition for an optical material is pumped into the mold, thereby suppressing the striations of a cured product to be obtained. < Healing process > Production method B includes a curing process in which two or more different monomers for an optical material in a polymerizable composition for an optical material are cured to obtain an optical material that is a cured product of the polymerizable composition for an optical material. The specific, preferable, and similar aspects of the curing process in production B are the same as the details of the specific, preferable, and similar aspects described in the section on<Proceso de curación> in the production method A described above. <Second prepolymerization process> Production method B may additionally include, besides the preparation process and prepolymerization process described above, a second prepolymerization process in which the remainder of the two or more different monomers for an optical material and the remainder of the polymerization catalyst are mixed and at least a portion of the remainder of the two or more different monomers for an optical material is polymerized to obtain a second prepolymer, thereby obtaining a mixture containing the second prepolymer; a process for producing a polymerizable composition for an optical material in which a polymerizable composition for an optical material containing the prepolymer, the second prepolymer and the polymerization catalyst is obtained by adding the mixture containing the second prepolymer to the mixture containing the prepolymer; and a curing process in which an optical material, which is a cured product of the polymerizable composition for an optical material, is obtained by curing the prepolymer and the second prepolymer in the polymerizable composition for an optical material. Since production method B includes the configuration described above, a mixture can be obtained containing a prepolymer obtained by a prepolymerization process and a mixture containing a second prepolymer obtained by a second prepolymerization process. This allows the viscosity of the mixture containing the prepolymer and the mixture containing the second prepolymer to be closer together, allowing them to mix more easily. The two or more different monomers for an optical material, polymerization catalysts, specific aspects, preferred aspects and similarities in the second prepolymerization process are the same as the two or more different monomers for an optical material, polymerization catalysts, specific aspects, preferred aspects and similarities in the prepolymerization process. When production method B includes a second prepolymerization process, the process for producing a polymerizable composition for an optical material is a process for obtaining a polymerizable composition for an optical material containing the prepolymer, the second prepolymer, and the polymerization catalyst by adding the mixture containing the second prepolymer to the mixture containing the prepolymer. The mixture containing the prepolymer, the specific aspects, the preferred aspects and the like in the process described above for producing a polymerizable composition for an optical material are the same as the specific aspects, the preferred aspects and the like in the <process for producing a polymerizable composition for an optical material> described above. When Production Method B includes a second prepolymerization process, the curing process is a process in which an optical material that is a cured product of the polymerizable composition for an optical material is obtained by curing the prepolymer and the second prepolymer in the polymerizable composition for an optical material. The prepolymers, specific aspects, preferred aspects and similar aspects in the curing process described above are the same as the specific aspects, preferred aspects and similar aspects in the <curing process> described above. < Annealing process > Production B may include, if necessary, an annealing process in which a cured polymerizable composition for an optical material is annealed. The preferable and similar aspects of the annealing process in production method B are the same as the preferable and similar aspects of the annealing process in production method A. < Other processes > Production method B can be provided with other processes as needed. The specific aspects, preferable aspects and similar aspects of other processes in production method B are the same as the specific aspects, preferable aspects and similar aspects of other processes in production method A. < Applications of optical materials > ινΐΛ / a / zuz i / un ouoz The specific examples, preferred specific examples, and similar applications of an optical material in production method B are the same as the specific examples, preferred specific examples, and similar applications of an optical material in production method A. - Second modality « Method for producing an optical material » A method for producing an optical material of a second modality includes: a preparation process in which a polymerizable composition for an optical material is prepared containing two or more different monomers for an optical material and a polymerization catalyst, and in which the content of the polymerization catalyst with respect to the total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass; and a curing process in which the polymerizable composition for an optical material is cured by polymerizing the two or more different monomers for an optical material in the polymerizable composition for an optical material. The method for producing an optical material of the second modality is the same as the method for producing an optical material of the first modality, except that the content of the polymerization catalyst with respect to the total of 100 parts by mass of two or more different monomers for an optical material is from 0.010 parts by mass to 0.050 parts by mass. The details of specific examples, preferred specific examples, specific aspects, preferred aspects, and the like for each component in the method for producing an optical material of the second modality are the same as the details of specific examples, preferred specific examples, specific aspects, preferred aspects, and the like for each component in the method for producing an optical material of the first modality. The second type of description includes the following aspects. < 2-1 > A method for producing an optical material, the method comprising a preparation process for preparing a polymerizable composition for an optical material containing two or more different monomers for an optical material and a polymerization catalyst, wherein the content of the polymerization catalyst with respect to the total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass, and a curing process wherein the polymerizable composition for an optical material is cured by polymerizing the two or more different monomers for an optical material into the polymerizable composition for an optical material. < 2-2> The process for producing an optical material according to <2-1>, wherein the preparation process is a process for producing a polymerizable composition for an optical material by premixing a portion of the two or more different monomers for an optical material with the polymerization catalyst and then further mixing the remainder of the two or more different monomers for an optical material. < 2-3> The method for producing an optical material according to <2-1> or <2-2>, wherein the curing process is a process for curing the polymerizable composition for an optical material by allowing the polymerizable composition for an optical material to remain immobile in a closed system space. < 2-4> The method for producing an optical material according to any of <2-1> to <2-3>, wherein the curing process is a process for curing the polymerizable composition for an optical material by allowing the polymerizable composition for an optical material to remain stationary without heating from the outside. < 2-5> The method for producing an optical material according to any of <2-1> to <2-4>, wherein the curing process is a process for curing the polymerizable composition for an optical material by allowing the polymerizable composition for an optical material to remain immobile for from 2 hours to 10 hours. < 2-6> The method for producing an optical material according to any of <2-1> to <2-5>, wherein the two or more different monomers for an optical material contain: an isocyanate compound (A); and at least one hydrogen-active compound (B) selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound. < 2-7> The method for producing an optical material according to <2-6>, wherein the isocyanate compound (A) contains an aromatic isocyanate compound. < 2-8> The method for producing an optical material according to any of <2-1> to <2-7>, wherein the polymerization catalyst contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8 and an organometallic catalyst. < 2-9> The method for producing an optical material according to any of <2-1> to <2-8>, wherein the polymerization catalyst contains at least one selected from the group consisting of an amine catalyst and an organotin catalyst. < 2-10> The method for producing an optical material according to any of <2-1> to <2-9>, wherein the polymerization catalyst contains at least one selected from the group consisting of 3,5-lutidine, 2,4,6-collidine, triethylenediamine, A / ,A / -dimethylethanolamine, triethylamine, Af-ethylmorpholine, dibutyltin dichloride, dimethyltin dichloride, dibutyltin dilaurate, and dibutyltin diacetate. < 2-11> A polymerizable composition for an optical material containing a polymerization catalyst, and wherein the content of the polymerization catalyst with respect to the total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass. Examples The polythiol compounds used in the examples can be produced by the method described in WO2014 / 027665. < Example A > The first and second modalities of the description are described in detail later as example A, but the first and second modalities are not limited to these examples. The following evaluations were carried out on the molded bodies obtained in each of the examples or comparative examples. (Degree of opacity) Light from a light source (LUMINAR ACE LA-150A manufactured by HAYASHI-REPIC CO., LTD.) was transmitted through a prepared molded body in a darkened environment. An image of the light transmitted through the molded product was captured by an image processor (manufactured by Ube Information Systems, Inc.), and the captured image underwent shading processing. The degree of shading in the processed image was quantified for each pixel, and the average of the numerical values ​​of the shading degrees for the individual pixels was obtained to determine the opacity level of the molded body. The degree of opacity obtained was evaluated according to the following criteria. A: The degree of opacity was less than 35. B: The degree of opacity ranged from 35 to less than 50. C: The degree of opacity ranged from 50 to less than 100. D: The degree of opacity was 100 or more. (Stretch marks) A molded body with a center thickness of 8 mm and a diameter of 78 mm was projected under an ultra-high pressure mercury lamp (model light source OPM-252HEG: manufactured by USHIO Inc.) and the transmitted image was observed and visually evaluated according to the following criteria. A: No striations were observed. Specifically, there were no striations with a length of 1.0 mm or more visually observed within or outside a radius of 15 mm from the center of the molded body. B: Although striations were observed, the molded body was generally acceptable. Specifically, although striations 1.0 mm or longer were visually observed outside the 15 mm radius from the center of the molded body, striations 1.0 mm or longer were not visually observed within the 15 mm radius from the center of the molded body, and the molded body was generally acceptable as a product. C: Streaks were observed, and the molded body was unacceptable as a product. Specifically, striations with a length of 1.0 mm or more were visually observed within and outside a 15 mm radius from the center of the molded body. (Mold release property) The mold release property of a molded body when the molded body was released from a mold was evaluated according to the following criteria. A: The molded body detached without applying any force. B: The molded body detached when force was applied. C: The molded body came off when force was applied, but there was a possibility that the mold or lens could be damaged. D: The molded body did not detach even when force was applied and a product could not be obtained. In example A and example B, the -Ea / R of each polymerization catalyst is as follows. Dibutyltin(II) dichloride -5428 3,5-Lutidine -3723 [Example 1 A] A mixed liquid was prepared by stirring 0.1 parts by mass of ZelecUN (internal mold release agent) manufactured by Stepan Company, 1.5 parts by mass of Tinuvin 329 (ultraviolet absorber), and 42.0 parts by mass of m-xylene diisocyanate (monomer for an optical material) at 25 °C for 1 hour to complete dissolution. Subsequently, 48 parts by mass of 4-mercaptomethyl-1,8-dimercapto-3,6-dithioctane (monomer for an optical material) were added to the resulting mixed liquid, and the mixture was stirred at 15 °C for 5 minutes to prepare a uniform solution. This solution was defoamed at 400 Pa for 60 minutes to obtain a first mixed liquid. 10.0 parts by mass of m-xylene diisocyanate [monomer for an optical material] and 0.02 parts by mass of 3,5-lutidine [polymerization catalyst] (pKa value = 6.14) were stirred at 25 °C for 10 minutes to complete dissolution to obtain a second mixed liquid. The first and second liquid mixtures were then blended at 20 °C to obtain a polymerizable composition for an optical material as a uniform solution. The thixotropy ratio of the polymerizable composition for an optical material is shown in Table 1. This solution was injected at a rate of 10 g / s into a lens-preparing mold cavity with a set center thickness of 8 mm, composed of a 4-curve glass mold (upper mold) with a diameter of 78 mm and a 4-curve glass mold (lower mold) with a diameter of 78 mm, while filtered with a 1 µm PTFE filter. After thermally isolated polymerization by allowing this cast-molded product to remain motionless for 5 hours in a thermally insulated container at 25 °C, a cured molded body was released from the mold and further annealed at 120 °C for 2 hours to obtain a molded body (lens). The properties of the resulting molded body were measured, and favorable physical properties were exhibited, with a refractive index (ne) of 1.664, an Abbe number (ve) of 31, and a glass transition temperature (Tg) of 88 °C. The results for the degree of opacity, striations, and mold release properties are shown in Table 1. [Example 2A] A molded body was obtained using the same method as in Example 1A, except that the amount of polymerization catalyst was set as described in Table 1. The properties of the resulting molded body were measured, and favorable physical properties were exhibited, with a refractive index (ne) of 1.664, an Abbe number (ve) of 31, and a glass transition temperature (Tg) of 88 °C. The results for the degree of opacity, striations, and mold release properties are shown in Table 1. [Example 3A] A molded body was obtained using the same method as in Example 1A, except that the amount of polymerization catalyst was set as described in Table 1. ινΐΛ / a / zuz i / un The properties of the resulting molded body were measured, and favorable physical properties were exhibited, with a refractive index (ne) of 1.664, an Abbe number (ve) of 31, and a glass transition temperature (Tg) of 87 °C. The results for the degree of opacity, striations, and mold release properties are shown in Table 1. [Example 4A] A molded body was obtained using the same method as in Example 1A, except that the amount of polymerization catalyst was set as described in Table 1. The properties of the resulting molded body were measured, and favorable physical properties were exhibited, with a refractive index (ne) of 1.664, an Abbe number (ve) of 31, and a glass transition temperature (Tg) of 88 °C. The results for the degree of opacity, striations, and mold release properties are shown in Table 1. The molded body was obtained using the same method as in Example 1A, except that the amount of catalyst was set as described in Table 1. [Example 5A] A mixed liquid was prepared by stirring 0.1 parts by mass of ZelecUN (internal mold release agent) manufactured by Stepan Company, 1.5 parts by mass of Tinuvin 329 (ultraviolet absorber) and 40.7 parts by mass of m-xylene diisocyanate (monomer for an optical material) at 25 °C for 1 hour to complete dissolution, and then, to this mixed liquid, 49.3 parts by mass of a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane were added, and the mixture was stirred at 15 °C for 5 minutes to prepare a uniform solution. This solution was defoamed at 400 Pa for 60 minutes to obtain a first mixed liquid. 10.0 parts by mass of m-xylene diisocyanate [monomer for an optical material] and 0.02 parts by mass of 3,5-lutidine [polymerization catalyst] (pKa value = 6.14) were stirred at 25 °C for 10 minutes to complete dissolution to obtain a second mixed liquid. The first and second liquid mixtures were then blended at 20 °C to obtain a polymerizable composition for an optical material as a uniform solution. The thixotropy ratio of the polymerizable composition for an optical material is shown in Table 1. This solution was injected at a rate of 10 g / s into a lens-preparing mold cavity with a set center thickness of 8 mm, composed of a 4-curve glass mold (upper mold) with a diameter of 78 mm and a 4-curve glass mold (lower mold) with a diameter of 78 mm, while filtered with a 1 µm PTFE filter. After thermally isolated polymerization by allowing this cast-molded product to remain motionless for 5 hours in a thermally insulated container at 25 °C, a cured molded body was released from the mold and further annealed at 120 °C for 2 hours to obtain a molded body (lens). The properties of the resulting molded body were measured and exhibited favorable physical properties with a refractive index (ne) of 1.668, an Abbe number (ve) of 31 and a glass transition temperature (Tg) of 100 °C. The results for the degree of opacity, striations and mold release property are shown in Table 1. [Example 6A] A cured molded body was obtained using the same method as in Example 5A, except that the amount of catalyst was set as described in Table 1. The properties of the resulting molded body were measured, and favorable physical properties were exhibited, with a refractive index (ne) of 1.668, an Abbe number (ve) of 31, and a glass transition temperature (Tg) of 98 °C. The results for the degree of opacity, striations, and mold release properties are shown in Table 1. [Example 7A] A cured molded body was obtained using the same method as in Example 5A, except that the amount of catalyst was set as described in Table 1. The properties of the resulting molded body were measured, and favorable physical properties were exhibited, with a refractive index (ne) of 1.668, an Abbe number (ve) of 31, and a glass transition temperature (Tg) of 99 °C. The results for the degree of opacity, striations, and mold release properties are shown in Table 1. [Table 1] > α ι\ Ch C ό C α h ω ω μ σι ο σι ΙΌ ο σι [Table 1] Polymerizable composition for an optical material Polymerization catalyst Polymerization time (at rest) (h) With or without heating during polymerization Polymerization environment Evaluation Thixotropy ratio Viscosity (mPa-s) Type Polymerization catalyst content relative to 100 parts by mass of monomer for optical material (parts by mass) Opacity degree Streaks Mold release property Example 1A 1.0 24 3,5-lutidine 0.02 5 None Thermally insulated ABB Example 2A 1.0 29 3,5-lutidine 0.025 5 None Thermally insulated ABA Example 3A 1.0 35 3,5-lutidine 0.03 5 None Thermally insulated ABA Example 4A 1.0 40 3,5-lutidine 0.04 5 None Thermally insulated ABA Example 5A 1.0 24 3,5lutidine 0.02 5 None Thermally insulated ABB Example 6A 1.0 28 3,5lutidine 0.025 5 None Thermally insulated ABA Example 7A 1.0 35 3,5lutidine 0.04 5 None Thermally insulated ABA As shown in Table 1, for the Examples containing two or more different monomers for an optical material and a polymerization catalyst, and where the content of the polymerization catalyst described above for the total of 100 parts by mass of the two or more different monomers for an optical material described above is from 0.010 parts by mass to 0.50 parts by mass (preferably from 0.010 parts by mass to 0.05 parts by mass), lenses of favorable quality could be obtained even when the operating time of the polymerization reaction was set as short. < Example B > Production method B of the first modality will be described in detail later as example B. However, production method B of the first modality is not limited to these examples. The viscosity measurement method in example B is the same as the method described above. In example B, the amine content in a cured product was measured by the method described above. The following evaluations were carried out on the molded bodies obtained in each of the examples or comparative examples. (Stretch marks) A molded body was projected under an ultra-high pressure mercury lamp (model light source OPM-252HEG: manufactured by USHIO Inc.) and the transmitted image was observed and visually evaluated according to the following criteria. A: No striations were observed. Specifically, there were no striations with a length of 1.0 mm or more visually observed within or outside a radius of 15 mm from the center of the molded body. B: Although striations were observed, the molded body was generally acceptable. Specifically, although striations 1.0 mm or longer were visually observed outside the 15 mm radius from the center of the molded body, striations 1.0 mm or longer were not visually observed within the 15 mm radius from the center of the molded body, and the molded body was generally acceptable as a product. C: Streaks were observed, and the molded body was unacceptable as a product. Specifically, striations with a length of 1.0 mm or more were visually observed within and outside a 15 mm radius from the center of the molded body. [Example 1B] A liquid mixture was prepared by stirring 0.03 parts by mass of JP-506H (manufactured by Johoku Chemical Co., Ltd.), which is an acid phosphate ester, 1.5 parts by mass of Tinuvin 329 [ultraviolet absorber], and 40.7 parts by mass of m-xylene diisocyanate [monomer for an optical material] at 25 °C for 1 hour to complete dissolution. Then, 49.3 parts by mass of a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane [monomer for an optical material] were loaded into this liquid mixture, and the mixture was stirred at 25 °C for 5 minutes to prepare a uniform solution. Furthermore, to the resulting uniform solution, 0.015 parts by mass of 3,5-lutidine [polymerization catalyst] (pKa value = 6.14) were added and stirred at 400 Pa and 25 °C for 1 hour with degassing. The monomers for an optical material were polymerized while adjusting the viscosity to obtain a first blended liquid containing a prepolymer. The viscosity of the blend containing the prepolymer is shown in Table 2. A mixed liquid was prepared by loading 10 parts by mass of m-xylene diisocyanate [monomer for an optical material] and 0.010 parts by mass of 3,5-lutidine [polymerization catalyst]. This mixed liquid was stirred at 25 °C for 15 minutes to obtain a second mixed liquid. Then, the first mixed liquid and the second mixed liquid were blended at 20 °C to obtain a polymerizable composition for an optical material. Whether or not the prepolymer contains an isocyanate group is shown in Table 2. The value (also referred to as “refractive index A - refractive index B”) obtained by subtracting the refractive index B of the prepolymer raw material composition, which is the composition before the prepolymer is formed and contains two or more different monomers for an optical material and a polymerization catalyst from the refractive index A of the polymerizable prepolymer composition for an optical material is shown in Table 2. The polymerizable composition obtained for an optical material was remixed in a stationary mixer and pumped into a slip-molding mold (or mold). The viscosity (also referred to as pouring viscosity) of the polymerizable composition for an optical material when pumped into the mold and poured into the mold was adjusted to the value shown in Table 2. When pumping the polymerizable composition for an optical material, the polymerizable composition for an optical material was injected at a rate of 10 g / s into a cavity of a mold with the lens-making cavity having a set center thickness described in Table 2, composed of a 4-bend or 6-bend glass mold (upper mold) with a diameter of 78 mm and a 4-bend or 2-bend glass mold (lower mold) with a diameter of 78 mm, while filtering with a 1 pm PTFE filter. After thermally isolated polymerization by allowing this cast-molded product to remain motionless for 2 hours in a thermally insulated container at 25°C, the cured molded product was removed from the thermally insulated container and subjected to further heat polymerization at 120°C for 1 hour. A cured molded body was released from the mold and further annealed at 120 °C for 2 hours to obtain a molded body (lens). [Example 2B] A molded body (lens) was obtained by the same method as in Example 1B, except that the amount of polymerization catalyst and the stirring time of the first liquid mixed in the prepolymerization process were changed to the values ​​shown in Table 2 and the pouring viscosity of the polymerizable composition for an optical material was adjusted to the value shown in Table 2. [Example 3B] A mixed liquid was prepared by loading 0.03 parts by mass of JP-506H (manufactured by Johoku Chemical Co., Ltd.), an acid phosphate ester, 1.5 parts by mass of Tinuvin 329 [an ultraviolet absorber], and 50.7 parts by mass of m-xylene diisocyanate [a monomer for an optical material]. This mixed liquid was stirred at 25 °C for 1 hour to complete dissolution. Next, 6.9 parts by mass of a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane were loaded into this mixed liquid, and the mixture was stirred at 25 °C for 5 minutes to prepare a uniform solution. Furthermore, 0.0.25 parts by mass of 3,5-lutidine [polymerization catalyst] were stirred at 40 °C for 3 hours, whereupon the monomers for an optical material were polymerized while the viscosity was adjusted to obtain a mixture containing a prepolymer. The viscosity of the mixture containing the prepolymer is shown in Table 2. Then, degassing was performed on the mixture containing the prepolymer at 400 Pa and 25 °C for 1 hour to obtain a first mixed liquid. 42.4 parts by mass of a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane were loaded and degassed at 400 Pa and 25 °C for 1 hour to obtain a second mixed liquid. Then, the first mixed liquid and the second mixed liquid were blended at 20 °C to obtain a polymerizable composition for an optical material. Whether or not the prepolymer contains an isocyanate group is shown in Table 2. The value (also referred to as “refractive index A - refractive index B”) obtained by subtracting the refractive index B of the prepolymer raw material composition, which is the composition before the prepolymer is formed and contains two or more different monomers for an optical material and a polymerization catalyst from the refractive index A of the polymerizable prepolymer composition for an optical material is shown in Table 2. The polymerizable composition obtained for an optical material was pumped into a slip-casting mold by the same method as in Example 1B and the slip-casting viscosity was adjusted to the value shown in Table 2. After thermally isolated polymerization by allowing this cast-molded product to remain motionless for 2 hours in a thermally insulated container at 25°C, the cured molded product was removed from the thermally insulated container and subjected to further heat polymerization at 120°C for 1 hour. A cured molded body was released from the mold and further annealed at 120 °C for 2 hours to obtain a molded body (lens). [Example 4B to Example 8B] A molded body (lens) was obtained by the same method as in Example 3B, except that the amount of polymerization catalyst in the prepolymerization process, the content of a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane and the stirring time were changed to the values ​​shown in Table 2 and the molding viscosity of the polymerizable composition for an optical material was adjusted to the value shown in Table 2. [Example 9B] A molded body (lens) was obtained by the same method as in Example 8B, except the cast-molded product was allowed to remain motionless for 3 hours in a thermally insulated container at 25°C for thermally isolated polymerization, then the cast-molded product was removed from the thermally insulated container and the mold was released. [Example 10B] A molded body (lens) was obtained by the same method as in Example 8B, except that the cast-molded product was heated from 30°C to 120°C with thermally isolated non-polymerization time and heat polymerization was carried out for 3 hours. [Comparative Example 1B] A mixed liquid was prepared by stirring 0.1 parts by mass of internal mold release agent for RM manufactured by Mitsui Chemicals, Inc., 1.5 parts by mass of Tinuvin 329 [ultraviolet absorber] and 40.7 parts by mass of m-xylene diisocyanate [monomer for an optical material] at 25 °C for 1 hour to complete dissolution, and then 49.3 parts by mass of a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane into this mixed liquid, and the mixture was stirred at 25 °C for 5 minutes to prepare a uniform solution. The solution was degassed at 400 Pa for 1 hour to obtain a first mixed liquid. 10.0 parts by mass of m-xylene diisocyanate [monomer for an optical material] and 0.008 parts by mass of dimethyltin dichloride (DMC) [polymerization catalyst] were stirred at 25 °C for 10 minutes to complete dissolution to obtain a second mixed liquid. Then, the first mixed liquid and the second mixed liquid were blended at 20 °C to obtain a polymerizable composition for an optical material. The polymerizable composition obtained for an optical material was pumped into a pour mold using the same method as in Example 1B and the pour mold viscosity was adjusted to the value shown in Table 2. No thermal polymerization was performed on the molded product, and the product was heated from 20 °C to 120 °C over time, with thermal polymerization carried out for 30 hours. A molded body (lens) was then obtained using the same methods as in Example 1B. [Table 2] ινΐΛ / a / zuz i / un > α ι\ Ch C ό C α h [Table 2] ω ω ιυ ιυ σι ο σι ο σι Catalyst Prepolymer Process Refractive Index A - Refractive Index B Thixotropy Ratio Viscosity of Mixture Containing Prepolymer (mPa-s) Casting Viscosity (mPa-s) Polymerization Time (h) Amine Content in Cured Product (% by Mass) Streaks Type Total Content with Respect to Total 100 Parts by Mass of Monomer for an Optical Material (parts by Mass) Catalyst Content with Respect to Total 100 Parts by Mass of Monomer for an Optical Material (parts by Mass) A1 Content (parts by Mass) B1 Content (parts by Mass) Stirring Time (h) Whether the Prepolymer Contains an Isocyanate Group or Not Heat - Isolated Heating Total 4C 2mm Thickness 4C 10mm Thickness Front: 6C Back: 2C 15.6mm Thickness Example IB 3,5-lutidine 0.025 0.015 40.7 49.3 1 Yes 0.012 1.0 147 127 2 1 3 0.004 ABC Example 2B 3,5lutidine 0.025 0.0125 40.7 49.3 2 Yes 0.013 1.0 215 200 2 1 3 0.004 AAA Example 3B 3,5lutidine 0.025 0.025 50.7 6.9 3 Yes 0.012 1.0 41 108 2 1 3 0.004 ACC Example 4B 3,5lutidine 0.025 0.025 50.7 7.4 3 Yes 0.012 1.0 60 138 2 1 3 0.004 ABB Example 5B 3,5lutidine 0.025 0.025 50.7 7.4 3.5 Yes 0.012 1.0 60 150 2 1 3 0.004 AAB Example 6B 3,5lutidine 0.025 0.025 50.7 7.9 3 Yes 0.013 1.0 83 190 2 1 3 0.004 AAA Example 7B 3,5lutidine 0.025 0.025 50.7 8.1 3 Yes 0.013 1.0 98 240 2 1 3 0.004 AAA Example 8B 3,5-lutidine 0.04 0.04 50.7 8.1 1 Yes 0.013 1.0 102 250 2 1 3 0.008 AAA Example 9B 3,5-lutidine 0.04 0.04 50.7 8.1 1 Yes 0.013 1.0 102 250 3 0 3 0.008 AAA Example 10B 3,5-Imidine 0.04 0.04 50.7 8.1 1 Yes 0.013 1.0 102 250 0 3 3 0.008 AAA Comparative Example IB DMC 0.008 21 0 30 30 AA C. The monomer species listed in each table are as follows. a1: m-xylene diisocyanate b1: a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-tritiaundecane b2: 4-mercaptomethyl-1,8-dimercapto-3,6-ditioctane As shown in Table 2, examples that use a method to produce an optical material include: a preparation process to prepare a total of 100 parts by mass of two or more different monomers for an optical material and from 0.010 parts by mass to 0.50 parts by mass of a polymerization catalyst; a prepolymerization process for obtaining, by obtaining a prepolymer by mixing a portion of the two or more different monomers for an optical material and at least a portion of the polymerization catalyst and by polymerizing at least a portion of the two or more different monomers for an optical material, a mixture containing the prepolymer, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring; A process for producing a polymerizable composition for an optical material in which, by further adding at least the remainder of two or more different monomers for an optical material to the mixture containing the prepolymer, a polymerizable composition for an optical material is obtained containing the two or more different monomers for an optical material, the prepolymer, and the polymerization catalyst; and a curing process in which, by curing the two or more different monomers for an optical material in the polymerizable composition for an optical material, an optical material is obtained that is a cured product of the polymerizable composition for an optical material, were able to suppress striations in an optical material to be obtained and reduce the production time of the optical material. Furthermore, in comparative example 1B, where the polymerization catalyst content was less than 0.010 parts by mass, the production time for an optical material was up to 30 hours and could not be shortened. In comparative example 1B, when an optical material with a thickness of 15.6 mm was produced (front: 6 curves, back: 2 curves), the striation assessment was lower. Among the examples, in example 1B, example 2B and examples 4B to 10B, in which the viscosity (or casting viscosity) of the polymerizable composition for an optical material when cast was 120 mPa-s or greater, striations can be suppressed more favorably. [Example 11B] A mixed liquid was prepared by loading 0.05 parts by mass of JP-506H (manufactured by Johoku Chemical Co., Ltd.), an acid phosphate ester, 1.5 parts by mass of Tinuvin 329 (an ultraviolet absorber), and 52 parts by mass of m-xylene diisocyanate (a monomer for an optical material). This mixed liquid was stirred at 25 °C for 1 hour to ensure complete dissolution. Subsequently, 7.7 parts by mass of a mixture of 4-mercaptomethyl-1,8-dimercapto-3,6-dithioctane (a monomer for an optical material) was loaded into this mixed liquid, and the mixture was stirred at 25 °C for 5 minutes to prepare a uniform solution. Furthermore, to the uniform solution obtained, 0.02 parts by mass of 3,5lutidine [polymerization catalyst] were loaded and stirred at 40 °C for 3 hours, whereby the monomers for an optical material were polymerized while adjusting the viscosity to obtain a mixture containing a prepolymer.The viscosity of the mixture containing the prepolymer is shown in Table 3. Then, degassing was performed on the mixture containing the prepolymer at 400 Pa and 25 °C for 1 hour to obtain a first mixed liquid. 40.3 parts by mass of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane were loaded into the prepolymerization process, and this mixture was degassed at 400 Pa and 25 °C for 1 hour to obtain a second mixed liquid. Then, the first mixed liquid and the second mixed liquid were blended at 20 °C to obtain a polymerizable composition for an optical material. The polymerizable composition obtained for an optical material was pumped into a slip-casting mold by the same method as in Example 1B and the slip-casting viscosity was adjusted to the value shown in Table 3. After thermally isolated polymerization by allowing this cast-molded product to remain motionless for 2 hours in a thermally insulated container at 25°C, the cured molded product was removed from the thermally insulated container and subjected to further heat polymerization at 120°C for 1 hour. A cured molded body was released from the mold and further annealed at 120 °C for 2 hours to obtain a molded body (lens). [Example 12B to example 14B] A molded body (lens) was obtained by the same method as in Example 11B, except that the 4-mercaptomethyl-1,8-dimercapto-3,6-dithioctane content in the prepolymerization process was changed to the value shown in Table 3 and the pouring viscosity of the polymerizable composition for an optical material was adjusted to the value shown in Table 3. [Example 15B] A molded body (lens) was obtained by the same method as in Example 14B, except the cast-molded product was allowed to remain motionless for 3 hours in a thermally insulated container at 25°C for thermally isolated polymerization, and then the cast-molded product was removed from the thermally insulated container and the mold was released. [Example 16B] A molded body (lens) was obtained by the same method as in Example 14B, except that the cast-molded product was heated from 30 °C to 120 °C with thermally isolated non-polymerization time and heat polymerization was carried out for 3 hours. [Example 17B] A molded body (lens) was obtained by the same method as in Example 14B, except that the catalyst was changed from 3,5-lutyltin to dibutyltin dichloride (DBG) and the catalyst content, stirring time in the prepolymerization process, and polymerization time were changed to the values ​​shown in Table 3. [Table 3] ινΐΛ / a / zuz i / un [Table 3] ω ω ιό ιό momo mom Catalyst Prepolymerization process Refractive index A Refractive index B Thixotropy ratio Viscosity of mixture containing prepolymer (mPa-s) Casting viscosity (mPa-s) Polymerization time (h) Amine content in cured product (% by mass) Streaks Type Total content with respect to a total of 100 parts by mass of monomer for an optical material (parts by mass) Catalyst content with respect to a total of 100 parts by mass of monomer for an optical material (parts by mass) Amine content (parts by mass) Dioxide content (parts by mass) Stirring time (h) Whether the prepolymer contains an isocyanate group or not Thermally insulated Heating Total 4C 2 mm thick 4C 10 mm thick Front: 6C Back: 2C 15.6 mm thick Example 11B 3,5-lutidine 0.02 0.02 52.0 7.7 3 Yes 0.019 1.0 49 66 2 1 3 0.011 ACC Example 12B 3,5-lutidine 0.02 0.02 52.0 10.6 3 Yes 0.024 1.0 200 110 2 1 3 0.011 ABB Example 13B 3,5-lutidine 0.02 0.02 52.0 12.0 3 Yes 0.027 1.0 407 211 2 1 3 0.011 AAB Example 14B 3,5-lutidine 0.02 0.02 52.0 13.0 3 Yes 0.028 1.1 639 275 2 1 3 0.011 AAA Example 15B 3,5-lutidine 0.02 0.02 52.0 13.0 3 Yes 0.028 1.1 639 275 3 0 3 0.011 AAA Example 16B 3,5-lutidine 0.02 0.02 52.0 13.0 3 Yes 0.028 1.1 639 275 0 3 3 0.011 AAA Example 17B DBC 0.03 0.03 52.0 13.0 1.5 Yes 0.028 1.1 639 275 2 2 4 AA A. > archc or ccr As shown in Table 3, examples that use a method to produce an optical material include: a preparation process to prepare a total of 100 parts by mass of two or more different monomers for an optical material and from 0.010 parts by mass to 2.0 parts by mass of a polymerization catalyst; a prepolymerization process for obtaining, by mixing a portion of the two or more different monomers for an optical material and at least a portion of the polymerization catalyst and by polymerizing at least a portion of the two or more different monomers for an optical material, a mixture containing the prepolymer, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring; A process for producing a polymerizable composition for an optical material in which, by further adding at least the remainder of two or more different monomers for an optical material to the mixture containing the prepolymer, a polymerizable composition for an optical material is obtained containing the two or more different monomers for an optical material, the prepolymer, and the polymerization catalyst; and a curing process in which, by curing the two or more different monomers for an optical material in the polymerizable composition for an optical material, an optical material is obtained that is a cured product of the polymerizable composition for an optical material, were able to suppress striations in an optical material to be obtained and reduce the production time of the optical material. On the other hand, in comparative example 2B, the production time of an optical material was up to 38 hours and the production time could not be shortened. Among the examples, in examples 13B to 17B, in which the viscosity (or casting viscosity) of the polymerizable composition for an optical material when cast was 200 mPa-s or greater, striations can be suppressed more favorably. The descriptions of Japanese patent application No. 2020-011128 filed on January 27, 2020 and Japanese patent application No. 2020-194660 filed on November 24, 2020 are incorporated herein by reference in their entirety. All publications, patent applications, and technical standards mentioned in this specification are incorporated herein by reference to the same extent as if each individual publication, patent application, or technical standard were specifically and individually indicated as being incorporated by reference.

Claims

1. A polymerizable composition for an optical material, comprising two or more different monomers for an optical material and a polymerization catalyst, wherein: at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, the content of the polymerization catalyst with respect to a total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass, and a viscosity measured by a type B viscometer at 25 °C and 60 rpm is from 10 mPa-s to 1,000 mPa-s.

2. The polymerizable composition for an optical material according to claim 1, wherein a thixotropy ratio is 1.3 or less.

3. The polymerizable composition for an optical material according to claim 1 or 2, comprising: two or more different monomers for an optical material; a polymerization catalyst; and a prepolymer that is a polymer of the two or more different monomers for an optical material and that contains a polymerizable functional group.

4. The polymerizable composition for an optical material according to any one of claims 1 to 3, wherein the two or more different monomers for an optical material contain at least one hydrogen-active compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound.

5. The polymerizable composition for an optical material according to any of claims 1 to 4, wherein the polymerization catalyst satisfies the following condition 1: [Condition 1] -Ea / R is from -7,100 to -2,900 wherein Ea is an activation energy calculated by an Arrhenius chart from reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J / mol / K.

6. The polymerizable composition for an optical material according to any of claims 1 to 5, wherein the polymerization catalyst contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8 and an organometallic catalyst.

7. A polymerizable prepolymer composition for an optical material, comprising a polymerization catalyst and a prepolymer that is a polymer of two or more different monomers for an optical material and containing a polymerizable functional group, wherein: at least one of the two or more different monomers for an optical material is an isocyanate compound that does not contain aromatic rings, and a viscosity measured with a type B viscometer at 25 °C and 60 rpm is from 10 mPa-s to 2,000 mPa-s.

8. The polymerizable prepolymer composition for an optical material according to claim 7, wherein the polymerization catalyst content with respect to a total of 100 parts by mass of the prepolymer is from 0.1 parts by mass to 4.0 parts by mass.

9. The polymerizable prepolymer composition for an optical material according to claim 7 or 8, wherein the two or more different monomers for an optical material comprise at least one hydrogen-active compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound.

10. The polymerizable prepolymer composition for an optical material according to any of claims 7 to 9, wherein the polymerization catalyst satisfies the following condition 1: [Condition 1] -Ea / R is from -7,100 to -2,900 wherein Ea is an activation energy calculated by an Arrhenius chart from reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J / mol / K.

11. The polymerizable prepolymer composition for an optical material according to any of claims 7 to 10, wherein the polymerization catalyst contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8 and an organometallic catalyst.

12. A cured product of the polymerizable composition for an optical material according to any of claims 1 to 6 or the polymerizable prepolymer composition for an optical material according to any of claims 7 to 11.

13. A method for producing an optical material, the method comprising: a preparation process for preparing a polymerizable composition for an optical material containing two or more different monomers for an optical material and a polymerization catalyst, wherein: at least one of the two or more different monomers for an optical material is an isocyanate compound not containing aromatic rings, and the content of the polymerization catalyst with respect to a total of 100 parts by mass of the two or more different monomers for an optical material is from more than 0.05 parts by mass up to 2.0 parts by mass; a casting process in which a viscosity of the polymerizable composition for an optical material, measured with a type B viscometer at 25 °C and 60 rpm, is adjusted from 10 mPa-s to 1,000 mPa-s and the composition is cast into a mold; and a curing process for curing the polymerizable composition for an optical material by polymerizing the two or more different monomers for an optical material into the polymerizable composition for an optical material in the mold.

14. A method for producing an optical material, the method comprising: a preparation process for preparing a total of 100 parts by mass of two or more different monomers for an optical material and from 0.010 parts by mass to 0.50 parts by mass of a polymerization catalyst; and a prepolymerization process for obtaining, by obtaining a prepolymer by mixing a portion of the two or more different monomers for an optical material and at least a portion of the polymerization catalyst and by polymerizing at least a portion of the portion of the two or more different monomers for an optical material, a mixture containing the prepolymer, wherein at least one of the two or more different monomers for an optical material is an isocyanate compound not containing aromatic rings.

15. The method for producing an optical material according to claim 14, the method comprising: a process for producing a polymerizable composition for an optical material wherein, by further adding at least one residue of the two or more different monomers for an optical material to the mixture containing the prepolymer, a polymerizable composition for an optical material is obtained containing the two or more different monomers for an optical material, the prepolymer, and the polymerization catalyst; and a curing process wherein, by curing the two or more different monomers for an optical material in the polymerizable composition for an optical material, an optical material is obtained that is a cured product of the polymerizable composition for an optical material.

16. The method for producing an optical material according to any of claims 13 to 15, wherein the two or more different monomers for an optical material comprise at least one hydrogen-active compound selected from the group consisting of a polythiol compound containing two or more mercapto groups, a hydroxythiol compound containing one or more mercapto groups and one or more hydroxyl groups, a polyol compound containing two or more hydroxyl groups, and an amine compound.

17. The method for producing an optical material according to any of claims 13 to 16, wherein the polymerization catalyst satisfies the following condition 1. [Condition 1] -Ea / R is from -7,100 to -2,900 wherein Ea is an activation energy calculated from an Arrhenius chart from reaction rate constants of the two or more different monomers for an optical material at two or more different temperatures, and R is the gas constant 8.314 J / mol / K.

18. The method for producing an optical material according to any of claims 13 to 17, wherein the polymerization catalyst contains at least one selected from the group consisting of a basic catalyst having a pKa value from 4 to 8 and an organometallic catalyst.

19. The method for producing an optical material according to any of claims 13 to 18, wherein the polymerization catalyst contains at least one selected from the group consisting of an amine catalyst and an organotin catalyst.

20. A cured product of two or more different optical monomers, wherein: at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, there are no striations of a length of 1.0 mm or more within a radius of 15 mm from a center of the cured product, and an amine content, as measured by gas chromatography-mass spectrometry, is from 0.001% by mass to 0.50% by mass.