Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
  • C08G75/02—Polythioethers
  • C08G75/06—Polythioethers from cyclic thioethers
  • C08G75/08—Polythioethers from cyclic thioethers from thiiranes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
  • C08L81/02—Polythioethers; Polythioether-ethers
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
  • G02B1/041—Lenses
• • G—PHYSICS
  • G02—OPTICS
  • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
  • G02C7/00—Optical parts
  • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
  • G02C7/022—Ophthalmic lenses having special refractive features achieved by special materials or material structures

Definitions

• the present invention relates to a composition and an optical material and a lens using the composition.
• Optical materials are required to have optical performance such as heat resistance, low specific gravity, high transparency, low yellowness, high refractive index, and high Abbe number.
• optical performance such as heat resistance, low specific gravity, high transparency, low yellowness, high refractive index, and high Abbe number.
• further improvement in performance has been required, and in particular, an optical material having a high refractive index and a high Abbe number is required.
• Patent Document 1 As a material for achieving a high refractive index and a high Abbe number, a polymerizable composition for an optical material using an episulfide compound has attracted attention.
• Patent Document 1 in recent years, many organic compounds having a sulfur atom have been reported for the purpose of high refractive index and high Abbe number.
• the polyepisulfide compound having a sulfur atom is known to have a good balance between the refractive index and the Abbe number (Patent Document 1).
• the optical material obtained from the polyepisulfide compound of these inventions has achieved a high refractive index of 1.7 or more, but a material having a higher refractive index is required, and contains sulfur, selenium or tellurium atoms.
• An optical material using a composition for an optical material containing an organic compound having a cyclic skeleton has been proposed and has a refractive index of 1.73 or more (Patent Document 2).
• an optical material having a high refractive index can be obtained.
• the optical material having a high refractive index does not have sufficient oxidation resistance and tends to be easily colored during long-term storage and in a process requiring heat treatment. Therefore, it is an object of the present invention to provide a composition capable of obtaining an optical material having a high refractive index and excellent oxidation resistance.
• the present inventors have conducted diligent research to solve the above problems. As a result, they have found that the above problems can be solved by combining a thiol compound having an aromatic skeleton and a polyepisulfide compound, and have completed the present invention. That is, the present invention is, for example, as follows.
• the polythiol (d) is 1,2,6,7-tetramercapto-4-thiaheptane, methanedithiol, (sulfanylmethyldisulfanyl) methanethiol, bis (2-mercaptoethyl) sulfide, 2, 5-bis (mercaptomethyl) -1,4-dithian, 1,2-bis (2-mercaptoethylthio) -3-mercaptopropane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6, 9-Trithiaundecane, 4,7-Dimercaptomethyl-1,11-Dimercapto-3,6,9-Trithiaundecane, 5,7-Dimercaptomethyl-1,11-Dimercapto-3,6,9- Trithiaundecane, 1,1,3,3-tetrakis (mercaptomethylthio) propane, tetramercaptopentaerythritol, 1,3-bis (mercap
• the prepolymerization catalyst is selected from the group consisting of 2-mercapto-1-methylimidazole, 2-methyl-N-imidazole, and 1,2,2,6,6-pentamethylpiperidylmethacrylate.
• An optical lens comprising the optical material according to [12] above.
• composition capable of obtaining an optical material having a high refractive index and excellent oxidation resistance.
• composition contains the compound (a) represented by the formula (1) and the polyepisulfide compound (b) represented by the formula (2).
• sulfur, 1,2,3,5,6-pentathiepan (c), polythiol (d), a polymerizable compound, a prepolymerization catalyst, a polymerization catalyst, a polymerization modifier, an additive and the like may be further contained.
• the composition contains the compound (a) represented by the formula (1), that is, the thiol compound having an aromatic skeleton, the obtained cured product (optical material) is improved in high refractive index and oxidation resistance. be able to. Therefore, the composition is preferably a composition for an optical material.
• M represents an integer of 2 to 8, and is preferably 2, 3, or 6, more preferably 2 or 3, and even more preferably 3 from the viewpoint of color tone and ease of composition.
• N represents an integer of 0 to 6, preferably 0 to 2, more preferably 0 or 1, and even more preferably 0.
• m + n is not more than the number of carbon atoms constituting the aromatic ring represented by Ar, preferably 8 or less (m + n ⁇ 8), more preferably 2 to 6 or 3 to 6, and further preferably 2 to 3. Yes, especially preferably 3. It should be noted that when m + n is 3, the heat resistance is higher, which is preferable. Further, "less than or equal to the number of carbon atoms constituting the aromatic ring” means that the number of carbon atoms possessed as the aromatic ring is not exceeded. For example, in the case of a benzene ring, which is an aromatic ring composed of carbon and hydrogen, the number of carbon atoms constituting the ring is 6, so m + n is 6 or less. Further, in the case of the thiadiazole ring which is a complex aromatic ring, since the number of carbon atoms constituting the ring is 2, m + n is 2 or less.
• R 1 independently represents an alkylthio group, a halogen group, a hydroxy group, a dialkylthiocarbamoyl group, or a dialkylcarbamoylthio group.
• the alkylthio group is not particularly limited, and examples thereof include a methylthio group, an ethylthio group, a propylthio group, a butylthio group, an isobutylthio group, a sec-butylthio group, a tert-butylthio group, a pentylthio group, and a hexylthio group.
• the halogen group is not particularly limited, and examples thereof include a fluorine group (-F), a chlorine group (-Cl), a bromine group (-Br), and an iodine group (-I).
• the dialkylthiocarbamoyl group is not particularly limited, and examples thereof include a dimethylthiocarbamoyl group, a diethylthiocarbamoyl group, and an ethylmethylthiocarbamoyl group.
• the dialkylcarbamoylthio group is not particularly limited, and examples thereof include a dimethylcarbamoylthio group, a diethylcarbamoylthio group, and an ethylmethylcarbamoylthio group.
• Ar indicates an aromatic ring.
• the aromatic ring include an aromatic ring composed of carbon and hydrogen such as an aromatic hydrocarbon, and a heteroaromatic ring (aromatic ring containing a heteroatom).
• the aromatic ring represented by Ar has 2 or more carbon atoms, preferably 2 to 18, more preferably 2 to 12, and further preferably 3 to 6. Further, Ar is preferably a 5-membered ring or a 6-membered ring, and more preferably a 6-membered ring.
• benzene, naphthalene, fluorene, triazine and thiadiazole are preferable, benzene and naphthalene are more preferable, and benzene is still more preferable.
• the compound (a) are not particularly limited, but are dimercaptobenzene compounds such as 1,3-dimercaptobenzene and 1,4-dimercaptobenzene; 1,3,5-trimercaptobenzene, 1,2. , 4-Trimercaptobenzene, 1,2,5-Trimercaptobenzene and other trimercaptobenzene compounds; 1-methylthio-3,5-dimercaptobenzene, 1-methylthio-2,4-dimercaptobenzene, 1-methylthio Alkylthio group-substituted dimercaptobenzene compounds such as -2,5-dimercaptobenzene, 1-ethylthio-3,5-dimercaptobenzene, 1-t-butylthio-3,5-dimercaptobenzene; 1-fluoro-3, 5-Dimercaptobenzene, 1-Chloro-3,5-Dimercaptobenzene, 1-bromo-3,5-Dimer
• 5-Trimercaptobenzene, 1,5-naphthalenedithiol is more preferable, and 1,3,5-Trimercaptobenzene is further preferable from the viewpoint of higher refractive index.
• the above-mentioned compound (a) may be used alone or in combination of two or more.
• the content of the compound (a) is preferably 0.1 to 30% by mass, more preferably 0.5 to 25% by mass, and 1 to 20% by mass with respect to the total mass of the composition. It is more preferably present, and particularly preferably 2 to 10% by mass. When the content of the compound (a) is in the above range, a sufficiently high refractive index and an effect of improving the oxidation resistance can be obtained.
• p represents an integer of 0 to 4, preferably 0 to 2, and more preferably 0 or 1.
• q represents an integer of 0 to 2, preferably 0 or 1.
• the compound (b) include, but are not limited to, bis ( ⁇ -epithiopropyl) sulfide, bis ( ⁇ -epithiopropyl) disulfide and the like. Of these, bis ( ⁇ -epithiopropyl) sulfide is preferable.
• the above-mentioned compound (b) may be used alone or in combination of two or more.
• the content of the compound (b) is preferably 40 to 90% by mass, more preferably 45 to 85% by mass, and particularly preferably 50 to 80% by mass with respect to the total mass of the composition.
• the content of the compound (b) is in the above range, the curing reactivity can be improved while ensuring the heat resistance, which is preferable.
• the composition may further contain sulfur.
• sulfur By containing sulfur, the refractive index of the obtained optical material can be improved.
• the shape of sulfur is not particularly limited and may be any shape. Specific shapes include fine powder sulfur, colloidal sulfur, precipitated sulfur, crystalline sulfur, sublimated sulfur and the like. Of these, fine sulfur is preferable from the viewpoint of dissolution rate.
• the particle size (diameter) of sulfur is preferably smaller than 10 mesh (opening 1.70 mm), more preferably smaller than 30 mesh (opening 500 ⁇ m), and even smaller than 60 mesh (opening 250 ⁇ m). preferable.
• the particle size of sulfur is smaller than 10 mesh, sulfur is easily dissolved, which is preferable.
• the purity of sulfur is not particularly limited, but is preferably 98% or more, more preferably 99.0% or more, further preferably 99.5% or more, and further preferably 99.9% or more. Is particularly preferred. When the purity of sulfur is 98% or more, the color tone of the obtained optical material is further improved, which is preferable.
• the sulfur content is preferably 0 to 30% by mass, more preferably 0.1 to 25% by mass, and even more preferably 1 to 25% by mass with respect to the total mass of the composition. ..
• the sulfur content is in the above range, it is preferable because the effect of improving the folding ratio and the balance of solubility are excellent.
• 1,2,3,5,6-pentathiepan (c) is a compound represented by the following formula (3), and has an effect of improving the refractive index of the obtained optical material.
• the method for obtaining 1,2,3,5,6-pentathiepan (c) is not particularly limited, and a commercially available product may be used, or it may be collected and extracted from natural products such as crude oil and animals and plants, and is known. It may be synthesized by a method.
• a commercially available product may be used, or it may be collected and extracted from natural products such as crude oil and animals and plants, and is known. It may be synthesized by a method.
• synthesis method when synthesizing 1,2,3,5,6-pentathiepan (c) N. Takeda et al., Bull. Chem. Soc. Jpn., 68, 2757 (1995), F. Feher Et al., Angew. Chem. Int. Ed., 7, 301 (1968), G. W. Kutney et al., Can. J. Chem, 58, 1233 (1980) and the like.
• the content of 1,2,3,5,6-pentathiepan (c) is preferably 0 to 40% by mass, more preferably 0.1 to 35% by mass, based on the total mass of the composition. It is preferably 1 to 30% by weight, more preferably 1 to 30% by weight.
• the obtained optical material can achieve both high refractive index and high transparency, which is preferable.
• Polythiol (d) means a compound having two or more thiol groups (-SH) per molecule. At this time, the compound (a) (thiol compound having an aromatic skeleton) is not included in the polythiol (d).
• the polythiol (d) is not particularly limited, but from the viewpoint of high color tone improving effect, 1,2,6,7-tetramercapto-4-thiaheptane, methanedithiol, (sulfanylmethyldisulfanyl) methanethiol.
• Dissulfanyl) Methanethiol, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane is more preferred, bis (2-mercaptoethyl) sulfide, 1,2,6 , 7-Tetramercapto-4-thiaheptane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane are more preferred.
• the above-mentioned polythiol (d) may be used alone or in combination of two or more.
• the content of the polythiol (d) is preferably 0.1 to 30% by mass, more preferably 0.1 to 20% by mass, and 0.5 to 20% by mass with respect to the total mass of the composition. It is more preferably%, and particularly preferably 1 to 15% by mass.
• the content of the polythiol (d) is in the above range, the balance between the color tone stabilizing effect and the heat resistance is improved, which is preferable.
• the composition may further comprise a polymerizable compound.
• the physical characteristics of the optical material can be adjusted by containing the polymerizable compound.
• the "polymerizable compound” means a compound that can be copolymerized with the compound (b).
• the polymerizable compound is not particularly limited as long as it is a compound copolymerizable with the compound (b), and examples thereof include episulfide compounds, vinyl compounds, methacrylic compounds, acrylic compounds, allyl compounds and the like other than the compound (b). These compounds may be used alone or in combination of two or more.
• the amount of the polymerizable compound added is not particularly limited as long as it does not impair the effects of the present invention, and is preferably 0 to 30% by mass, preferably 1 to 30% by mass, based on the total mass of the composition. Is more preferable, and 1 to 20% by mass is further preferable.
• the composition may further comprise a prepolymerization catalyst.
• the prepolymerization catalyst By including the prepolymerization catalyst, the pre-cured product described later can be suitably produced.
• the prepolymerization catalyst is not particularly limited, and examples thereof include imidazoles, phosphines, thioureas, quaternary ammonium salts, quaternary phosphonium salts, tertiary sulfonium salts, secondary iodonium salts, and hindered amines. .. Of these, imidazoles and hindered amines are preferable from the viewpoint of good compatibility with the composition.
• the imidazoles are not particularly limited, and examples thereof include N-benzylimidazole, 4-methylimidazole, 4-ethylimidazole, 1-phenylimidazole, 2-methyl-N-methylimidazole and the like.
• the hindered amine is not particularly limited, but is 1,2,2,6,6-pentamethylpiperidylmethacrylate, 1,2,2,6,6-pentamethylpiperidylacryllate, 1,2, Examples include hindered amines such as 2,6,6-pentamethylpiperidyl-4-vinylbenzoate.
• the prepolymerization catalyst is selected from the group consisting of 2-mercapto-1-methylimidazole, 2-methyl-N-imidazole, and 1,2,2,6,6-pentamethylpiperidylmethacrylate. It is preferable to include at least one of them.
• the above-mentioned prepolymerization catalyst may be used alone or in combination of two or more.
• the amount of the prepolymerization catalyst added varies depending on the composition, the mixing ratio, and the polymerization curing method, and therefore cannot be unconditionally determined. It is preferably 0.0001% by mass to 10% by mass, and more preferably 0.003% by mass to 3.0% by mass with respect to the total of 100% by mass.
• the addition amount of the prepolymerization catalyst is 0.0001% by mass or more, the prepolymerization reaction proceeds favorably, which is preferable.
• the addition amount of the prepolymerization catalyst is 10% by mass or less, the oxidation resistance is high, which is preferable.
• the composition may further comprise a polymerization catalyst.
• the composition can be suitably polymerized to produce an optical material.
• the polymerization catalyst is not particularly limited, but is not particularly limited, but amines, phosphins, quaternary ammonium salts, quaternary phosphonium salts, tertiary sulfonium salts, secondary iodonium salts, mineral acids, Lewis acids, organic acids, and silica. Acids, boric acid tetrafluoroacids, peroxides, azized compounds, condensates of aldehydes and ammonia compounds, guanidines, thioureas, thiazoles, sulfenamides, thiurams, dithiocarbamates, xanthogens. Examples thereof include acid salts and acidic phosphate esters. Of these, amines, phosphines, quaternary ammonium salts, and quaternary phosphonium salts are preferable. These polymerization catalysts may be used alone or in combination of two or more.
• the amount of the polymerization catalyst added is preferably 0.0001 to 10% by mass, more preferably 0.01 to 3% by mass, based on the total mass of the composition.
• the composition may further comprise a polymerization modifier.
• the polymerization modifier is not particularly limited, and examples thereof include halides of Groups 13 to 16 in the long-term periodic table. Of these, halides of silicon, germanium, tin and antimony are preferable, and chlorides of germanium, tin and antimony having an alkyl group are more preferable. These polymerization modifiers may be used alone or in combination of two or more.
• the amount of the polymerization modifier added is preferably 0.0001 to 5.0% by mass, more preferably 0.01 to 2% by mass, based on the total mass of the composition.
• the composition may further comprise an additive.
• the additive include, but are not limited to, antioxidants, brewing agents, ultraviolet absorbers, deodorants, adhesion improvers, mold release improvers, radical polymerization initiators and the like. These additives may be used alone or in combination of two or more.
• the content of the additive is preferably 0 to 10% by mass, more preferably 0.5 to 10% by mass, based on the total mass of the composition.
• composition of composition preferably has the following composition: That is, the composition is based on the total amount of the composition.
• composition is not particularly limited and can be produced by a known method. Specifically, it is produced by mixing compound (a) and compound (b), and if necessary, sulfur, 1,2,3,5,6-pentathiepan (c), polythiol (d) and the like. be able to.
• a pre-cured product is provided.
• the pre-cured product is obtained by pre-polymerizing the above-mentioned composition.
• the pre-cured product is preferable from the viewpoints that the rate of increase in viscosity can be reduced, the transparency of the optical material is improved, and handling is facilitated.
• the "pre-cured product” means a liquid having a viscosity of 5,000 mps or less, and is at least a compound (a), an episulfide compound (b), a compound (c), sulfur, and a polymerizable compound.
• One contains a polymer, a partial polymer, an oligomer and the like formed by a polymerization reaction.
• the value measured by the following method shall be adopted as a "viscosity".
• Viscosity measurement method Using a cone plate type viscometer DV2THA CP (manufactured by AMETEK, Inc.), the viscosity of the pre-cured product at 30 ° C. is measured.
• a method for producing a pre-cured product includes a prepolymerization step of prepolymerizing the composition.
• the prepolymerization step is a step of prepolymerizing the composition.
• the composition those described above are used.
• the composition preferably comprises a prepolymerization catalyst.
• the prepolymerization step is preferably carried out by casting into a mold such as a mold from the viewpoint of carrying out the polymerization step described later after the prepolymerization. At this time, it is preferable to filter and remove impurities with a filter having a pore size of about 0.1 to 5 ⁇ m before casting from the viewpoint of improving the quality of the optical material.
• the temperature of the prepolymerization is preferably ⁇ 10 to 160 ° C., more preferably 0 to 100 ° C., and even more preferably 20 to 80 ° C.
• the prepolymerization time is preferably 0.1 to 480 minutes, more preferably 0.1 to 420 minutes, and even more preferably 0.1 to 360 minutes.
• the prepolymerization is preferably at ⁇ 10 to 160 ° C. for 0.1 to 480 minutes, more preferably 0 to 100 ° C. for 0.1 to 420 minutes, still more preferably 20 to 80 ° C. for 0.1. It takes about 360 minutes.
• Prepolymerization may be carried out under normal pressure, under pressure, or under reduced pressure.
• the prepolymerization is carried out under reduced pressure, hydrogen sulfide which promotes the reaction is removed, so that the reaction usually proceeds mildly as compared with the case where the prepolymerization is carried out under normal pressure.
• the pressure is normal, the pressure may be increased in the atmosphere or in an inert gas.
• the detection method is not particularly limited, and examples thereof include liquid chromatography, viscosity measurement, specific gravity measurement, and refractive index measurement. Of these, it is preferable to measure the refractive index because it is simple. These detection methods may be used alone or in combination of two or more.
• the prepolymerization reaction it is preferable to detect the progress of the prepolymerization reaction in-line.
• it is more preferable to perform in-line detection because it is not necessary to release the pressure or reduced pressure in order to obtain a measurement sample.
• in-line detection for example, when measuring the refractive index, by immersing the detection unit of the refractive index meter in the composition before prepolymerization and the reaction solution of prepolymerization, the refractive index increases as the reaction progresses. Can be detected and the progress of the reaction can be controlled.
• the in-line type refractive index meter includes a method in which a light emitting diode is used as a light source and the angle of prism reflected light is identified by a CCD cell.
• an optical material is provided.
• the optical material is obtained by curing the above-mentioned composition or the above-mentioned pre-cured product. That is, the optical material is a cured product of the composition or the pre-cured product.
• the optical material according to this embodiment has a high refractive index and excellent oxidation resistance.
• the refractive index of the optical material is preferably 1.71 or more, more preferably 1.72 or more, further preferably 1.73 or more, and 1.75 or more. Is particularly preferred. That is, in the above-mentioned composition, the refractive index of the obtained optical material is preferably 1.71 or more, more preferably 1.72 or more, still more preferably 1.73 or more, and particularly preferably 1.75 or more.
• the value of "refractive index" is measured by the method described in Examples.
• the oxidation resistance of the optical material is preferably a ⁇ YI value of 2 or less, more preferably 1.8 or less, further preferably 1.5 or less, and 1.0 or less. Is particularly preferable. That is, in the above-mentioned composition, the ⁇ YI value of the obtained optical material is preferably 2 or less, more preferably 1.8 or less, still more preferably 1.5 or less, and particularly preferably 1.0 or less. In addition, in this specification, " ⁇ YI value" is measured by the method described in Example.
• the optical material according to this embodiment has a high refractive index and excellent oxidation resistance, it is possible to blend various comonomer into the composition and increase the blending amount thereof, thereby providing a wide range of physical properties. It is possible to design the optical material to have.
• a method for manufacturing an optical material comprises a polymerization step of polymerizing the composition described above or the pre-cured product described above.
• the polymerization step is a step of polymerizing the above-mentioned composition or the above-mentioned pre-cured product.
• the polymerization step is usually carried out by casting a composition or a pre-cured product into a mold such as a mold and polymerizing the composition.
• a filter having a pore size of about 0.1 to 5 ⁇ m before casting from the viewpoint of improving the quality of the optical material.
• the polymerization step includes a step of raising the temperature to the polymerization temperature, a step of keeping the temperature at the polymerization temperature, and a step of lowering the temperature.
• the polymerization may be carried out in multiple stages. That is, the steps for maintaining the polymerization temperature may have two or more steps.
• the polymerization step is a step of raising the temperature to the first polymerization temperature, a step of holding the temperature at the first polymerization temperature, a step of raising the temperature to the second polymerization temperature, and a step of holding the temperature at the second polymerization temperature. Including the process of polymerizing and the process of lowering the temperature. In this case, the first polymerization temperature is lower than the second polymerization temperature.
• the polymerization step includes a step of raising the temperature to the first polymerization temperature, a step of holding the temperature at the first polymerization temperature, a step of lowering the temperature to the second polymerization temperature, and a second polymerization. Includes a process of maintaining the temperature and a process of lowering the temperature. In this case, the first polymerization temperature is higher than the second polymerization temperature.
• the temperature rise rate in the step of raising the temperature is preferably 0.1 ° C to 100 ° C / h. Further, the temperature lowering rate in the step of lowering the temperature is preferably 0.1 ° C. to 100 ° C./h.
• the polymerization temperature is usually ⁇ 10 ° C. to 140 ° C., preferably 0 to 140 ° C.
• the polymerization time is usually 1 to 100 hours, preferably 1 to 72 hours.
• the "polymerization time” means a time including the time of the step of raising the temperature and the step of lowering the temperature.
• the temperature of the annealing treatment is preferably 50 to 150 ° C.
• the annealing treatment time is preferably 10 minutes to 5 hours.
• the obtained optical material may be subjected to surface treatment such as dyeing, hard coating, impact resistance coating, antireflection, and antifogging property, if necessary.
• optical materials are useful for various applications such as optical members, mechanical component materials, electrical / electronic component materials, automobile component materials, civil engineering and building materials, molding materials, as well as paint and adhesive materials.
• optical materials include eyeglass lenses, image pickup lenses for (digital) cameras, light beam condensing lenses, lenses for light diffusion, encapsulants for LEDs, optical adhesives, bonding materials for optical transmission, and the like.
• Optical applications such as transparent glass and cover glass such as optical fiber, prism, filter, diffraction grid, watch glass, cover glass for display device; substrate for display elements such as LCD, organic EL and PDP, substrate for color filter, touch panel It is suitably used for display device applications such as substrates, information recording substrates, display backlights, light guide plates, display protective films, antireflection films, antifogging films and other coating agents (coating films).
• the optical material is particularly preferably used for applications such as optical lenses, prisms, optical fibers, information recording substrates, filters, etc., and more preferably used for optical lenses. That is, in one embodiment, an optical lens including the above-mentioned optical material is provided.
• the optical lens obtained from the composition according to the present invention is excellent in stability, hue, transparency, etc., it is used in fields such as telescopes, binoculars, television projectors, etc., in which expensive high-refractive index glass lenses have been conventionally used. It can be and is extremely useful. If necessary, it is preferably used in the form of an aspherical lens.
• a-8 1,3-Dimercaptobenzene (manufactured by Tokyo Chemical Industry Co., Ltd.)
• a-9 1,5-naphthalenethiol (manufactured by Tokyo Chemical Industry Co., Ltd.)
• a-10 Bismthiol (manufactured by Tokyo Chemical Industry Co., Ltd.)
• d-1 Bis (2-mercaptoethyl) sulfide
• d-2 1,2,6,7-tetramercapto-4-thiaheptane
• d-3 4,8-dimercaptomethyl-1,11-dimercapto- 3,6,9-Tricia Undecane
• Example 1 10 parts by mass of compound a-1 and 90 parts by mass of compound b-1, 0.02 parts by mass of tetra-n-butylphosphonium bromide as a polymerization catalyst, and 0.05 parts by mass of di-n-butyltin dichloride as a polymerization modifier are mixed. While vacuum degassing, the composition was produced.
• Examples 2 to 21, Comparative Examples 1 to 5 The composition was produced in the same manner as in Example 1 except that the composition was changed to that shown in Table 2 below.

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