WO2010131631A1 - 高屈折率高強度光学材料用組成物 - Google Patents
高屈折率高強度光学材料用組成物 Download PDFInfo
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- WO2010131631A1 WO2010131631A1 PCT/JP2010/057909 JP2010057909W WO2010131631A1 WO 2010131631 A1 WO2010131631 A1 WO 2010131631A1 JP 2010057909 W JP2010057909 W JP 2010057909W WO 2010131631 A1 WO2010131631 A1 WO 2010131631A1
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- 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
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- 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
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- 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
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- 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
- G02B1/043—Contact lenses
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- 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
Definitions
- the present invention relates to a composition for optical materials, and further relates to an optical material (optical resin material) such as a plastic lens, a prism, an optical fiber, an information recording base, and a filter using the composition.
- optical material optical resin material
- the optical material of the present invention is suitably used as a plastic lens, particularly as a lens for two-point frame glasses.
- Plastic materials have been widely used in recent years for various optical materials, particularly spectacle lenses, because they are light and tough and easy to dye.
- the performance required especially for optical materials, especially optical materials for spectacle lenses is low specific gravity as physical properties, low yellowness as chemical and thermal properties, high heat resistance, high strength as mechanical properties, etc.
- the optical performance is high transparency, high refractive index and high Abbe number.
- a high refractive index makes it possible to reduce the thickness of the lens, and a high Abbe number reduces chromatic aberration of the lens.
- the refractive index increases, the Abbe number decreases, and studies are being made to improve both simultaneously.
- optical materials having a refractive index of 1.73 or more have been proposed using optical materials made of polyepisulfide compounds as disclosed in Patent Documents 2 and 3.
- the problems to be solved by the present invention are high refractive index (ne is 1.73 or more), high strength (elongation of three-point bending test is 10% or more and good drilling strength), and high heat resistance.
- An object of the present invention is to provide a composition for an optical material capable of providing an optical material satisfying the above three properties (softening point of TMA measurement is 70 ° C. or higher) or more.
- the present invention is as follows.
- the (b) episulfide compound is bis ( ⁇ -epithiopropyl) sulfide and / or bis ( ⁇ -epithiopropyl) disulfide.
- the (c) xylylenedithiol compound is m-xylylenedithiol and / or p-xylylenedithiol.
- composition for optical materials according to [1] wherein the content ratio of the inorganic compound (a) is 10% by weight or more based on the total amount of the composition for optical materials.
- composition for optical materials according to [1] wherein the xylylene diisocyanate compound is not contained in an amount of 1% by weight or more based on the total amount of the composition for optical materials.
- method according to [1] wherein at least a part of the (a) inorganic compound and the (b) episulfide compound is contained as a prepolymerization reaction product obtained by a prepolymerization reaction with each other. Composition for optical material.
- a method for preparing a composition for optical materials comprising a step of mixing the following compounds (a), (b) and (c).
- a method for producing an optical material comprising the following steps (A) and (B).
- a step of preparing a composition for optical material by mixing the following compounds (a), (b) and (c): (A) 1 to 50 parts by weight (however, 10% by weight or more based on the total amount of the optical material composition) of sulfur and / or selenium atoms (b) 50 to 99 parts by weight of bis ( ⁇ -epi Thiopropyl) sulfide, bis ( ⁇ -epithiopropyl) disulfide, bis ( ⁇ -epithiopropyl) trisulfide, bis ( ⁇ -epithiopropylthio) methane, 1,2-bis ( ⁇ -epithiopropylthio) Ethane, 1,3-bis ( ⁇ -epithiopropylthio) propane, 1,2-bis ( ⁇ -epithiopropylthio) propane, 1,4-bis ( ⁇ -epithiopropy
- step (A) further comprises a step of prepolymerizing at least a part of the inorganic compound (a) and the episulfide compound (b).
- Production method [12]: An optical material obtained by the production method according to [10] or [11], wherein the refractive index (ne) is 1.73 or more.
- [13] A lens for two-point frame glasses made of the optical material according to [12].
- the present invention has excellent characteristics with respect to high refractive index (ne is 1.73 or more), high strength (elongation of three-point bending test is 10% or more and good drilling strength), and heat resistance. It is possible to provide a composition for optical materials, a resin for optical materials obtained by curing the composition, and a lens for two-point frame glasses using the composition.
- composition for optical material comprises: (a) an inorganic compound having a sulfur atom and / or selenium atom (hereinafter referred to as (a) compound), (b) an episulfide compound (hereinafter referred to as (b) compound) ), And (c) a xylylene dithiol compound (hereinafter referred to as (c) compound), and optionally containing optional components such as a polymerization catalyst, a polymerization regulator, and a performance improver.
- an inorganic compound having a sulfur atom and / or selenium atom hereinafter referred to as (a) compound
- an episulfide compound hereinafter referred to as (b) compound
- a xylylene dithiol compound hereinafter referred to as (c) compound
- optionally containing optional components such as a polymerization catalyst, a polymerization regulator, and a performance improver.
- the inorganic compound having a sulfur atom and / or selenium atom as the compound (a) used in the present invention includes all inorganic compounds having at least one sulfur atom and / or selenium atom. .
- A It is preferable that the ratio of the total weight of the sulfur atom in a compound and / or a selenium atom is 30 mass% or more. If this ratio is less than 30% by mass, the effect of increasing the refractive index of the resin may be small because the increase in the ratio of the weight of sulfur atoms and / or selenium atoms in the composition for optical materials is small. .
- the amount of the compound (a) added is 1 to 50 parts by weight, preferably 5 to 50 parts by weight, more preferably 10 to 40 parts by weight when the total of the compounds (a) and (b) is 100 parts by weight. Part by weight, particularly preferably 10 to 30 parts by weight.
- the inorganic compound having a sulfur atom include sulfur, hydrogen sulfide, carbon disulfide, selenocarbon sulfide, ammonium sulfide, sulfur dioxide, sulfur trioxide and other sulfur oxides, thiocarbonate, sulfuric acid and salts thereof, sulfuric acid Hydrogen salt, sulfite, hyposulfite, persulfate, thiocyanate, thiosulfate, halides such as sulfur dichloride, thionyl chloride, thiophosgene, boron sulfide, nitrogen sulfide, silicon sulfide, phosphorus sulfide, arsenic sulfide, Examples thereof include metal sulfides and metal hydrosulfides.
- sulfur, carbon disulfide, phosphorus sulfide, selenium sulfide, metal sulfide and metal hydrosulfide are preferable, sulfur, carbon disulfide and selenium sulfide are more preferable, and sulfur is particularly preferable.
- the inorganic compound having a selenium atom includes all inorganic compounds satisfying this condition except for selenocarbon sulfide and selenium sulfide, which are listed as specific examples of the inorganic compound containing a sulfur atom.
- selenium oxides such as selenium, hydrogen selenide, selenium dioxide, carbon diselenide, ammonium selenide, selenium dioxide, selenic acid and salts thereof, selenite and salts thereof, hydrogen selenate salts, seleno
- sulfuric acid and its salts selenopyrosulfuric acid and its salts
- halides such as selenium tetrabromide and selenium oxychloride, selenocyanate, boron selenide, phosphorus selenide, arsenic selenide, metal selenide and the like.
- selenium, carbon diselenide, phosphorus selenide, and metal selenide preferred are selenium and carbon diselenide.
- These inorganic compounds having a sulfur atom and / or selenium atom may be used alone or in combination of two or more.
- (b) Compound As the compound (b) used in the present invention, bis ( ⁇ -epithiopropyl) sulfide, bis ( ⁇ -epithiopropyl) disulfide, bis ( ⁇ -epithiopropyl) trisulfide, Bis ( ⁇ -epithiopropylthio) methane, 1,2-bis ( ⁇ -epithiopropylthio) ethane, 1,3-bis ( ⁇ -epithiopropylthio) propane, 1,2-bis ( ⁇ -epi And one or more episulfide compounds selected from the group consisting of thiopropylthio) propane, 1,4-bis ( ⁇ -epithiopropylthio) butane, and bis ( ⁇ -epithiopropylthioethyl) sulfide.
- preferred specific examples are bis ( ⁇ -epithiopropyl) sulfide (formula (1)) and / or bis ( ⁇ -epithiopropyl) disulfide (formula (2)), and the most preferred specific example is bis ( ⁇ -epithiopropyl) sulfide.
- the amount of the compound (b) used in the present invention is 50 to 99 parts by weight, preferably 50 to 95 parts by weight, when the total of the compounds (a) and (b) is 100 parts by weight.
- the amount is preferably 60 to 90 parts by weight, particularly preferably 70 to 90 parts by weight.
- the compound (c) used in the present invention is a xylylene dithiol compound, and specific examples include o-, m-, and p-xylylene dithiol.
- preferred xylylene dithiol compounds are m-xylylene dithiol (formula (3)) and p-xylylene dithiol (formula (4)) represented by the following structural formula. It is m-xylylene dithiol that becomes a liquid.
- the amount of the compound (c) used in the present invention is preferably 1 to 50 parts by weight, more preferably 2 parts by weight when the total of the compounds (a) and (b) is 100 parts by weight. Part to 30 parts by weight, more preferably 3 parts to 10 parts by weight.
- Polymerization catalysts include amines, phosphines, quaternary ammonium salts, quaternary phosphonium salts, condensates of aldehydes and amine compounds, salts of carboxylic acids and ammonia, urethanes, thiourethanes, guanidines, Thioureas, thiazoles, sulfenamides, thiurams, dithiocarbamates, xanthates, tertiary sulfonium salts, secondary iodonium salts, mineral acids, Lewis acids, organic acids, silicic acids, tetrafluoride Examples thereof include boric acids, peroxides, azo compounds, and acidic phosphate esters.
- the polymerization catalyst is not particularly limited as long as it exhibits polymerization and curing. These polymerization catalysts may be used alone or in combination of two or more. Among these, preferred specific examples include tetra-n-butylammonium bromide, triethylbenzylammonium chloride, cetyldimethylbenzylammonium chloride, quaternary ammonium salts such as 1-n-dodecylpyridinium chloride, tetra-n-butylphosphonium bromide, Quaternary phosphonium salts such as tetraphenylphosphonium bromide can be mentioned.
- triethylbenzylammonium chloride and / or tetra-n-butylphosphonium bromide are more preferred specific examples.
- triethylbenzylammonium chloride and / or tetra-n-butylphosphonium bromide are more preferred specific examples.
- the addition amount of the polymerization catalyst is 0.001 to 5 parts by weight, preferably 0.002 to 5 parts by weight with respect to 100 parts by weight of the total of the compounds (a), (b) and (c). More preferably, it is 0.005 to 3 parts by weight.
- composition for an optical material of the present invention may be added with a polymerization regulator as necessary for the purpose of extending the pot life or dispersing the polymerization heat during polymerization and curing. it can.
- the polymerization regulator include halides of Group 13 to 16 elements in the long-term periodic table.
- These polymerization regulators may be used alone or in combination of two or more.
- preferred are halides of silicon, germanium, tin and antimony. More preferred are chlorides of silicon, germanium, tin and antimony, and further preferred are chlorides of germanium, tin and antimony having an alkyl group.
- Specific examples of the most preferred are dibutyltin dichloride, butyltin trichloride, dioctyltin dichloride, octyltin trichloride, dibutyldichlorogermanium, butyltrichlorogermanium, diphenyldichlorogermanium, phenyltrichlorogermanium, triphenylantimony dichloride.
- the addition amount of the polymerization regulator is 0.001 to 5 parts by weight, preferably 0.002 to 5 parts by weight with respect to 100 parts by weight of the total of the compounds (a), (b) and (c). More preferably, the amount is 0.005 to 3 parts by weight.
- Performance improver In the composition for optical materials of the present invention, part or all of the compounds of the composition component is used for the purpose of improving various performances such as oxidation resistance, weather resistance, dyeability, strength, and refractive index. It is also possible to add a compound capable of reacting with (performance improving agent). In this case, a known polymerization catalyst can be added separately as necessary for the reaction.
- Examples of the compound (performance improving agent) capable of reacting with part or all of the composition components include compounds having two or more SH groups other than the xylylene diol of the present invention, epoxy compounds, carboxylic acids, and carboxylic acid anhydrides. Phenols, amines, vinyl compounds, allyl compounds, acrylic compounds, methacrylic compounds and the like.
- the amount of the performance improver added is 0.001 to 10 parts by weight, preferably 0.002 to 5 parts by weight, based on 100 parts by weight of the total of the compounds (a), (b) and (c). More preferably 0.005 to 3 parts by weight.
- composition for optical materials of the present invention various additives such as known antioxidants, bluing agents, ultraviolet absorbers, and deodorants are added as optional components as necessary.
- additives such as known antioxidants, bluing agents, ultraviolet absorbers, and deodorants are added as optional components as necessary.
- a known external and / or internal adhesion improver is used, or when it is difficult to peel off from the mold, a known external and / or internal mold release is improved.
- Agents can also be used.
- external and / or internal adhesion improvers and external and / or internal releasability improvers can be applied to glass or metal molds used during polymerization and curing, and the optical material composition of the present invention. It is also effective to improve the adhesiveness or releasability between the obtained optical material and the mold.
- the content of the compound (a) is preferably 10% by weight or more based on the total amount of the optical resin composition.
- the xylylene diisocyanate compound is not contained in an amount of 1% by weight or more based on the total amount of the optical material composition, that is, the content of the xylylene diisocyanate compound is less than 1% by weight based on the total amount of the optical resin composition. Desirably, it is more desirable not to contain a xylylene diisocyanate compound.
- the (a) compound and the (b) compound may be included as a prepolymerized reaction product obtained by preliminarily polymerizing at least a part of each other.
- composition for optical material of the present invention is a mixture of the above-mentioned (a), (b) and (c) compounds, and optional components used as necessary, by a conventional method. However, it is desirable that at least a part of the compound (a) and the compound (b) is preliminarily polymerized first and then mixed with the compound (c).
- the prepolymerization reaction product obtained by preliminarily reacting the compound (a) and the compound (b) in advance, the compound (c) and any It is preferred to mix the ingredients.
- the prepolymerization reaction of the (a) compound and the (b) compound is an effective means for handling the solid (a) compound, and the resulting optical material has good transparency. This also makes it possible to blend a large amount of the compound (a) (an inorganic compound having sulfur or the like), and provide an optical resin composition that can provide an optical material having a high refractive index, high strength, and high heat resistance. Things are obtained.
- the method for prepolymerizing (a) compound and (b) compound will be described in detail.
- the (a) compound and the (b) compound are partly or wholly reacted under stirring or non-stirring.
- the proportion of the prepolymerization reaction is not particularly limited, but it is preferable that the (a) compound and the (b) compound are prepolymerized so that the compound (a) does not exist as a solid during casting. More preferably, 50 to 100% by weight of each of the (a) compound and the (b) compound is subjected to the prepolymerization reaction, and particularly preferably, all parts by weight of each of the (a) compound and the (b) compound are subjected to the prepolymerization reaction.
- the proportion of the prepolymerization reaction is not particularly limited, but it is preferable that the (a) compound and the (b) compound are prepolymerized so that the compound (a) does not exist as a solid during casting. More preferably, 50 to 100% by weight of each of the (a
- a prepolymerization reaction catalyst for promoting the reaction between the compound (a) and the compound (b) may be added.
- the prepolymerization reaction catalyst the above-described polymerization catalyst can be used, but preferably a compound containing a nitrogen or phosphorus atom is used, more preferably a compound containing a nitrogen or phosphorus atom and having an unsaturated bond. . Particularly preferred are imidazoles, and most preferred is 2-mercapto-1-methylimidazole.
- the addition amount of the prepolymerization reaction catalyst is 0.001 to 5 parts by weight, preferably 0.002 to 5 parts by weight, more preferably 100 parts by weight of the total of the compounds (a) and (b). Is 0.005 to 3 parts by weight.
- the prepolymerization reaction may be performed in an atmosphere such as air, presence of a gas such as nitrogen or oxygen, sealed under normal pressure or pressure increase, or reduced pressure.
- the prepolymerization reaction may be performed in the presence of various additives such as a polymerization regulator, a performance improver, and an ultraviolet absorber as required.
- a polymerization regulator such as polyethylene glycol
- a performance improver such as polypropylene
- an ultraviolet absorber as required.
- the prepolymerization reaction is carried out by selectively bringing forward a part of the polymerization curing reaction, It is desirable to control the reaction by adopting mild conditions.
- the compound (a) and the compound (b) are prepolymerized and then the compound (c) is added.
- the prepolymerization reaction time is 1 minute to 72 hours, preferably 10 minutes to 48 hours, and more preferably 30 minutes to 24 hours.
- the prepolymerization reaction temperature is 0 ° C. to 150 ° C., preferably 10 ° C. to 120 ° C., more preferably 20 ° C. to 100 ° C.
- the compound (a) before the reaction is 100 mol%) by this prepolymerization reaction, and react by 20 mol% or more. Is more preferable.
- liquid chromatography and / or a method for measuring the refractive index is preferable because of high sensitivity, and further, a method for measuring the refractive index is more preferable because it is simple.
- a method for measuring the refractive index it is preferable to use an inline refractometer because the progress of the reaction can be observed in real time.
- composition for optical materials The method for producing the composition for optical materials is as follows in detail.
- performance improver part of composition component or All reactive compounds
- polymerization catalysts polymerization regulators
- adhesion improvers or mold release improvers antioxidants
- bluing agents ultraviolet absorbers, deodorants and other various additives, etc.
- ultraviolet absorbers deodorants and other various additives, etc.
- each raw material, additive and the like may be mixed in any order.
- a preliminary reaction may be performed in advance on two or more types of each component and then mixed.
- the above-mentioned prepolymerization reaction is performed on the compound (a) and the compound (b), and (c) a part of the compound and the performance improver are reacted in advance (not simply mixed), and then mixed. Is also possible.
- the set temperature, the time required for this, etc. may basically be any conditions that allow the components to be sufficiently mixed. However, excessive temperature and time may cause undesirable reactions between the raw materials and additives. It is not suitable for the reason that it becomes easy and the viscosity is increased and the casting operation may be difficult.
- the mixing temperature should be in the range of about ⁇ 50 ° C. to 100 ° C., a preferred temperature range is ⁇ 30 ° C. to 70 ° C., and a more preferred range is ⁇ 5 ° C. to 50 ° C.
- the mixing time is 1 minute to 12 hours, preferably 5 minutes to 10 hours, and most preferably about 5 minutes to 6 hours. If necessary, the active energy ray may be blocked and mixed. After that, deaeration treatment may be performed by the following method.
- a deaeration process may be performed after preparing a resin composition by the said mixing. It is preferable to deaerate the composition for optical material in advance before polymerization and curing from the viewpoint of achieving high transparency of the optical material obtained by polymerization and curing.
- the deaeration treatment is performed before mixing the compound (a), the compound (b), the compound (c), and a compound capable of reacting with some or all of various composition components, a polymerization catalyst, a polymerization regulator, and various additives.
- At or after mixing under reduced pressure. Preferably, it is performed under reduced pressure during or after mixing.
- Degassing conditions are 0 to 100 ° C. under reduced pressure of 0.1 to 15000 Pa for 1 minute to 24 hours.
- the degree of vacuum is preferably 1 to 10000 Pa, more preferably 1 to 5000 Pa, and the degree of vacuum may be varied within these ranges.
- the deaeration time is preferably 5 minutes to 18 hours, more preferably 10 minutes to 12 hours.
- the temperature at the time of deaeration is preferably 5 ° C. to 80 ° C., more preferably 10 ° C. to 60 ° C., and the temperature may be varied within these ranges.
- the components removed by the deaeration treatment are mainly dissolved gases such as hydrogen sulfide and low boiling point substances such as low molecular weight mercaptans, but are not particularly limited as long as the effect of the deaeration treatment is exhibited.
- the optical material composition thus obtained can be purified by filtering impurities and the like immediately before polymerization and curing. It is desirable from the viewpoint of further improving the quality of the optical material of the present invention to purify the optical material composition through a filter to filter impurities and the like.
- the pore size of the filter used here is about 0.05 to 10 ⁇ m, and generally 0.1 to 1.0 ⁇ m is used.
- a filter material PTFE, PET, PP, or the like is preferably used.
- the optical material of the present invention is obtained by polymerizing and curing the composition for optical materials.
- the composition for optical materials is usually injected into a glass or metal mold and then heated using an electric furnace or irradiated with active energy rays such as ultraviolet rays using an active energy ray generator or the like. Is done by.
- the polymerization time is 0.1 to 100 hours, usually 1 to 48 hours, and the polymerization temperature is ⁇ 10 ° C. to 160 ° C., usually ⁇ 10 ° C. to 140 ° C.
- the polymerization can be carried out by holding at a predetermined polymerization temperature for a predetermined time, raising the temperature from 0.1 ° C. to 100 ° C./h, lowering the temperature from 0.1 ° C. to 100 ° C./h, and combinations thereof.
- annealing the material at a temperature of 50 ° C. to 150 ° C. for about 5 minutes to 5 hours is a preferable treatment for removing distortion of the optical material.
- surface treatments such as dyeing, hard coating, antireflection, antifogging, antifouling and impact resistance can be performed as necessary.
- the refractive index (ne) of the target resin is preferably 1.73 or more, more preferably 1.74 or more, and the strength is 10% or more, more preferably 11%, in the three-point bending test.
- good drilling strength, heat resistance (softening point of TMA measurement) is 70 ° C. or more, more preferably 72 ° C. or more, particularly preferably 75 ° C. or more.
- a homogeneous composition for an optical material in which a high amount of sulfur as a refractive index agent is blended in a large amount (for example, 10% by weight or more based on the total amount of the optical resin composition).
- a large amount for example, 10% by weight or more based on the total amount of the optical resin composition.
- the compound (a) is preliminarily polymerized in the preparation stage of the optical material composition to consume a suitable amount, thereby completely dissolving the compound (a) to obtain a uniform liquid composition.
- an optical material having a high refractive index can be obtained.
- an isocyanate compound has been conventionally blended for high strength.
- it tends to rapidly polymerize when an isocyanate is added at the same time, and it is difficult to obtain a polymerized cured product. Become.
- the content of the isocyanate compound is limited to be low in order to avoid rapid polymerization (preferably substantially no isocyanate compound is used), and a xylylene dithiol compound is used as the component (c). Yes.
- ne is 1.73 or more
- elongation in a three-point bending test is 10% or more
- an optical material having good drilling resistance and high heat resistance can be easily obtained.
- the refractive index and Abbe number, heat resistance, elongation and drill strength of the obtained optical material were evaluated by the following methods.
- Example 1 (A) 16 parts by weight of sulfur as the compound, (b) 84 parts by weight of bis ( ⁇ -epithiopropyl) sulfide as the compound, and 100 parts by weight of 2- (2-hydroxy-5-tert-octyl) as the UV absorber 1 part by weight of phenyl) benzotriazole was added and mixed well at 60 ° C. to make uniform. Subsequently, 0.5 part by weight of 2-mercapto-1-methylimidazole was added, and a prepolymerization reaction was performed at 60 ° C. until the compound (a) was not precipitated at 20 ° C.
- the prepolymerization reaction was stopped when about 50 mol% of the compound (a) was reacted, and the compound (a) remained in the obtained composition.
- the reaction ratio of the compound was determined by liquid chromatography analysis and refractive index measurement of the reaction solution.
- composition was cooled to 20 ° C.
- c-1 compound m-xylylenedithiol
- c-1 compound triethylbenzylammonium chloride
- di-n-butyltin dichloride di-n-butyltin dichloride
- the obtained composition for optical material was filtered through a 1.0 ⁇ m PTFE membrane filter, poured into a 2.5 mm thick plate mold composed of two glass plates and a gasket, at 30 ° C. After heating for 10 hours, the temperature was raised at a constant rate from 30 ° C. to 100 ° C. over 10 hours, and finally heated at 100 ° C. for 1 hour to be cured by polymerization. After cooling to room temperature, the mold was released from the mold to obtain a cured optical material.
- Table 1 shows the evaluation results of the refractive index and Abbe number, heat resistance, elongation and drill strength of the obtained optical material.
- Example 2 (A) 16 parts by weight of the compound, (b) 84 parts by weight of the compound, (c) 1 part by weight of the c-1 compound as the compound, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole 1 as the ultraviolet absorber Part by weight was added and mixed well at 50 ° C. to make it uniform. Subsequently, 0.05 parts by weight of 2-mercapto-1-methylimidazole was added, and a prepolymerization reaction was performed at 50 ° C. until the compound (a) was not precipitated at 20 ° C.
- the prepolymerization reaction was stopped when about 50 mol% of the compound (a) was reacted, and the compound (a) remained in the obtained composition. Thereafter, the obtained composition was cooled to 20 ° C. Thereto was added 7 parts by weight of the c-1 compound not added, 0.050 part by weight of triethylbenzylammonium chloride as a polymerization catalyst, and 0.22 part by weight of di-n-butyltin dichloride as a polymerization regulator. The same treatment and polymerization curing were performed to obtain an optical material. Table 1 shows the evaluation results of the refractive index and Abbe number, heat resistance, elongation and drill strength of the obtained optical material.
- Examples 3 to 6> It carried out like Example 1 except changing the quantity of a compound.
- Table 1 shows the evaluation results of the refractive index and Abbe number, heat resistance, elongation and drill strength of the obtained optical material.
- Example 7 The same procedure as in Example 1 was performed except that p-xylylenedithiol (hereinafter referred to as c-2 compound) was used instead of the compound c-1.
- Table 1 shows the evaluation results of the refractive index and Abbe number, heat resistance, elongation and drill strength of the obtained optical material.
- Example 1 The same procedure as in Example 1 was performed except that the c-1 compound of the compound (c) was excluded from the composition. Table 1 shows the evaluation results of the refractive index and Abbe number, heat resistance and elongation of the obtained optical material. The obtained optical material had insufficient elongation and drilling strength.
- Example 2 The same procedure as in Example 1 was performed except that bis (2-mercaptoethyl) sulfide (hereinafter referred to as o-1 compound) was used instead of the compound c-1. However, in order to ensure the refractive index and heat resistance, deaeration treatment was performed at 4000 Pa for 90 minutes at 20 ° C. Table 1 shows the evaluation results of the refractive index and Abbe number, heat resistance, elongation and drill strength of the obtained optical material. The obtained optical material had insufficient elongation and drilling strength.
- o-1 compound bis (2-mercaptoethyl) sulfide
- Comparative Example 4 was repeated except that the composition shown in Table 1 was changed.
- Table 1 shows the evaluation results of the refractive index and Abbe number, heat resistance, elongation and drill strength of the obtained optical material. All of the obtained optical materials had an insufficient refractive index, and some had insufficient heat resistance and drilling strength.
- Example 8 The same prepolymerization operation as in Example 1 was performed on 16 parts by weight of the compound (a) and 84 parts by weight of the compound (b) to obtain a uniform composition. Thereto, 15 parts by weight of o-1 compound, 12 parts by weight of o-2 compound, 0.035 parts by weight of triethylbenzylammonium chloride as a polymerization catalyst, and 0.22 parts by weight of di-n-butyltin dichloride as a polymerization regulator may be added. When mixed and homogenized, rapid polymerization occurred and a cured optical material could not be obtained.
- composition for optical materials of the present invention can provide an optical material having excellent properties such as high refractive index, high strength, and high heat resistance by polymerization and curing.
- Such an optical material of the present invention is suitable as an optical material for plastic lenses, prisms, optical fibers, information recording substrates, filters, and the like, and is particularly suitable for plastic lenses, particularly lenses for two-point frame glasses.
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Abstract
Description
したがって、エピスルフィド化合物を用いた屈折率が1.73以上のレンズは、高屈折率、高アッベ数を有するが、さらに優れた強度と耐熱性を付与したレンズの開発が求められていた。
[1](a)1~50重量部の硫黄原子および/またはセレン原子を有する無機化合物、
(b)50~99重量部のビス(β-エピチオプロピル)スルフィド、ビス(β-エピチオプロピル)ジスルフィド、ビス(β-エピチオプロピル)トリスルフィド、ビス(β-エピチオプロピルチオ)メタン、1,2-ビス(β-エピチオプロピルチオ)エタン、1,3-ビス(β-エピチオプロピルチオ)プロパン、1,2-ビス(β-エピチオプロピルチオ)プロパン、1,4-ビス(β-エピチオプロピルチオ)ブタン、およびビス(β-エピチオプロピルチオエチル)スルフィドから選択される1種以上であるエピスルフィド化合物、
(c)前記(a)および(b)化合物の合計を100重量部とした場合に1~50重量部のキシリレンジチオール化合物、を含有する光学材料用組成物。
[3]前記(b)エピスルフィド化合物がビス(β-エピチオプロピル)スルフィドおよび/またはビス(β-エピチオプロピル)ジスルフィドである、[1]記載の光学材料用組成物。
[4]前記(c)キシリレンジチオール化合物が、m-キシリレンジチオールおよび/またはp-キシリレンジチオールである、[1]記載の光学材料用組成物。
[6]キシリレンジイソシアネート化合物が、光学材料用組成物全量に対して1重量%以上含まれないことを特徴とする、[1]記載の光学材料用組成物。
[7]前記(a)無機化合物と(b)エピスルフィド化合物の少なくとも一部が、相互に予備重合反応して得られる予備重合反応物として含まれていることを特徴とする、[1]記載の光学材料用組成物。
(a)1~50重量部(ただし光学材料用組成物全量に対して10重量%以上)の硫黄原子および/またはセレン原子を有する無機化合物
(b)50~99重量部のビス(β-エピチオプロピル)スルフィド、ビス(β-エピチオプロピル)ジスルフィド、ビス(β-エピチオプロピル)トリスルフィド、ビス(β-エピチオプロピルチオ)メタン、1,2-ビス(β-エピチオプロピルチオ)エタン、1,3-ビス(β-エピチオプロピルチオ)プロパン、1,2-ビス(β-エピチオプロピルチオ)プロパン、1,4-ビス(β-エピチオプロピルチオ)ブタン、およびビス(β-エピチオプロピルチオエチル)スルフィドから選択される1種以上であるエピスルフィド化合物
(c)前記(a)および(b)化合物の合計を100重量部とした場合に1~50重量部のキシリレンジチオール化合物
[9]:さらに前記(a)無機化合物と(b)エピスルフィド化合物の少なくとも一部を予備重合反応させる工程を含むことを特徴とする、[8]記載の光学材料用組成物の調製方法。
(A)下記(a)、(b)及び(c)化合物を混合して光学材料用組成物を調製する工程、
(a)1~50重量部(ただし光学材料用組成物全量に対して10重量%以上)の硫黄原子および/またはセレン原子を有する無機化合物
(b)50~99重量部のビス(β-エピチオプロピル)スルフィド、ビス(β-エピチオプロピル)ジスルフィド、ビス(β-エピチオプロピル)トリスルフィド、ビス(β-エピチオプロピルチオ)メタン、1,2-ビス(β-エピチオプロピルチオ)エタン、1,3-ビス(β-エピチオプロピルチオ)プロパン、1,2-ビス(β-エピチオプロピルチオ)プロパン、1,4-ビス(β-エピチオプロピルチオ)ブタン、およびビス(β-エピチオプロピルチオエチル)スルフィドから選択される1種以上であるエピスルフィド化合物
(c)前記(a)および(b)化合物の合計を100重量部とした場合に1~50重量部のキシリレンジチオール化合物
(B)前記光学材料用組成物を重合硬化させる工程
[12]:[10]又は[11]記載の製造方法によって得られる光学材料であって、屈折率(ne)が1.73以上である、光学材料。
[13]:[12]記載の光学材料からなる、ツーポイントフレームメガネ用レンズ。
本発明の光学材料用組成物は、(a)硫黄原子および/またはセレン原子を有する無機化合物(以下、(a)化合物)、(b)エピスルフィド化合物(以下、(b)化合物)、及び(c)キシリレンジチオール化合物(以下、(c)化合物)、並びに必要に応じて重合触媒、重合調節剤、性能改良剤等の任意成分を含有してなるものである。
本発明で使用する(a)化合物である硫黄原子および/またはセレン原子を有する無機化合物は、硫黄原子および/またはセレン原子を1個以上有する全ての無機化合物を包含する。(a)化合物は、化合物中の硫黄原子および/またはセレン原子の合計重量の割合が30質量%以上であることが好ましい。この割合が、30質量%未満である場合、光学材料用組成物中の硫黄原子および/またはセレン原子の重量の割合上昇分が小さいため、樹脂の高屈折率化の効果が小さくなる場合がある。(a)化合物の添加量は、(a)および(b)化合物の合計を100重量部とした場合、1~50重量部使用するが、好ましくは5~50重量部、より好ましくは10~40重量部、特に好ましくは10~30重量部である。
これら硫黄原子および/またはセレン原子を有する無機化合物は、単独でも、2種類以上を混合して使用しても良い。
本発明で使用する(b)化合物としては、ビス(β-エピチオプロピル)スルフィド、ビス(β-エピチオプロピル)ジスルフィド、ビス(β-エピチオプロピル)トリスルフィド、ビス(β-エピチオプロピルチオ)メタン、1,2-ビス(β-エピチオプロピルチオ)エタン、1,3-ビス(β-エピチオプロピルチオ)プロパン、1,2-ビス(β-エピチオプロピルチオ)プロパン、1,4-ビス(β-エピチオプロピルチオ)ブタン、およびビス(β-エピチオプロピルチオエチル)スルフィドからなる群から選択される1種以上のエピスルフィド化合物が挙げられる。
本発明で使用する(c)化合物はキシリレンジチオール化合物であり、具体例としては、o-、m-、およびp-キシリレンジチオールが好ましく挙げられる。中でも好ましいキシリレンジチオール化合物は、下記構造式で表されるm-キシリレンジチオール(式(3))、p-キシリレンジチオール(式(4))であり、特に好ましいキシリレンジチオール化合物は常温で液体となるm-キシリレンジチオールである。
本発明の光学材料用組成物には、重合硬化のために、必要に応じて重合触媒を添加することができる。重合触媒としては、アミン類、ホスフィン類、第4級アンモニウム塩類、第4級ホスホニウム塩類、アルデヒドとアミン系化合物の縮合物、カルボン酸とアンモニアとの塩、ウレタン類、チオウレタン類、グアニジン類、チオ尿素類、チアゾール類、スルフェンアミド類、チウラム類、ジチオカルバミン酸塩類、キサントゲン酸塩、第3級スルホニウム塩類、第2級ヨードニウム塩類、鉱酸類、ルイス酸類、有機酸類、ケイ酸類、四フッ化ホウ酸類、過酸化物、アゾ系化合物、酸性リン酸エステル類を挙げることができる。
本発明の光学材料用組成物には、重合硬化する際に、ポットライフの延長や重合発熱の分散化などを目的として、必要に応じて重合調節剤を添加することができる。重合調節剤は、長期周期律表における第13~16族元素のハロゲン化物を挙げることができる。
本発明の光学材料用組成物には、耐酸化性、耐候性、染色性、強度、屈折率等の各種性能の改良を目的として、組成成分の化合物の一部もしくは全部と反応可能な化合物(性能改良剤)を添加することも可能である。この場合は、反応のために必要に応じて公知の重合触媒を別途加えることができる。
本発明の光学材料用組成物においては、任意成分として、公知の酸化防止剤、ブルーイング剤、紫外線吸収剤、消臭剤等の各種添加剤を必要に応じて加え、得られる材料の実用性をより向上せしめることはもちろん可能である。
また、本発明の光学材料が重合中に型から剥がれやすい場合には公知の外部および/または内部密着性改善剤を、または型から剥がれにくい場合には公知の外部および/または内部離型性改善剤を、使用することもできる。これらの外部および/または内部密着性改善剤や外部および/または内部離型性改善剤は、重合硬化時に用いるガラスもしくは金属製の型に塗布することができるほか、本発明の光学材料用組成物に添加して、得られる光学材料と型の密着性または離型性を向上せしめることも有効である。
また、キシリレンジイソシアネート化合物が光学材料用組成物全量に対して1重量%以上含まれないこと、すなわちキシリレンジイソシアネート化合物の含有量が光学用樹脂組成物全量に対し1重量%未満であることが望ましく、更にはキシリレンジイソシアネート化合物を含まないことがより望ましい。キシリレンジイソシアネート化合物の含有量が1重量%以上であると、ジイソシアネートによる屈折率低下が著しく、屈折率を1.73以上にすることが困難となるだけでなく、急速重合が起こり重合硬化物を得ることができなくなる場合がある。
また、(a)化合物と(b)化合物は、その少なくとも一部が相互に予備重合反応して得られる予備重合反応物として含まれていてもよい。
本発明の光学材料用組成物は、上記(a)、(b)及び(c)化合物、並びに必要に応じて用いられる任意成分を通常の方法で混合・攪拌することにより得られるが、(a)化合物と(b)化合物の少なくとも一部を先に予備重合反応させた後、(c)化合物と混合させるのが望ましい。
本発明の光学材料用組成物の調製にあたっては、あらかじめ(a)化合物と(b)化合物とを予備重合反応させ、得られた予備重合反応物と(c)化合物及び任意成分とを混合することが好ましい。(a)化合物と(b)化合物を予備重合反応させることは、固体の(a)化合物をハンドリングする際には有効な手段であり、得られる光学材料の透明性も良好となる。また、これにより(a)化合物(硫黄等を有する無機化合物)を多量に配合することが可能となり、高屈折率、高強度、及び高耐熱性を備えた光学材料を提供しうる光学用樹脂組成物が得られる。
光学材料用組成物の製造方法は、詳しく述べるならば以下の通りである。(a)化合物と(b)化合物、および/または(a)化合物と(b)化合物を予備重合反応して得られる予備重合反応物、(c)化合物、性能改良剤(組成成分の一部もしくは全部と反応可能な化合物)、重合触媒、重合調節剤、密着性改善剤または離型性改善剤、酸化防止剤、ブルーイング剤、紫外線吸収剤、消臭剤等の各種添加剤等は、全て同一容器内で同時に撹拌下に混合しても、各原料を段階的に添加混合しても、数成分を別々に混合後さらに同一容器内で再混合しても良い。各原料および添加剤等はいかなる順序で混合しても構わない。さらに、上述した(a)化合物と(b)化合物の組み合わせによる予備重合反応以外にも、各成分の2種類以上についてあらかじめ予備的な反応を行った後、混合しても構わない。例えば(a)化合物と(b)化合物について上記予備重合反応を行い、別途(c)化合物の一部と性能改良剤を(単に混合するのではなく)予備的に反応させ、それらを混合することも可能である。
本発明の光学材料用組成物の製造方法においては、上記混合により樹脂組成物を調製後、脱気処理を行う場合がある。光学材料用組成物を重合硬化前にあらかじめ脱気処理することは、重合硬化して得られる光学材料の高度な透明性を達成する面から好ましい。
脱気処理は、(a)化合物、(b)化合物、(c)化合物、および各種組成成分の一部もしくは全部と反応可能な化合物、重合触媒、重合調節剤、各種添加剤の混合前、混合時あるいは混合後に、減圧下に行う。好ましくは、混合時あるいは混合後に、減圧下に行う。
脱気処理により、除去される成分は、主に硫化水素等の溶存ガスや低分子量のメルカプタン等の低沸点物等であるが、脱気処理の効果を発現するのであれば、特に限定されない。
本発明の光学材料は、上記光学材料用組成物を重合硬化して得られる。重合硬化は通常、光学材料用組成物をガラスや金属製の型に注入後、電気炉を用いて加熱したり、活性エネルギー線発生装置等を用いて紫外線などの活性エネルギー線を照射したりすることによって行われる。重合時間は0.1~100時間、通常1~48時間であり、重合温度は-10℃~160℃、通常-10℃~140℃である。重合は所定の重合温度で所定時間のホールド、0.1℃~100℃/hの昇温、0.1℃~100℃/hの降温およびこれらの組み合わせで行うことができる。
デジタル精密屈折計(カルニュー光学工業株式会社製、KPR-200)を用い、25℃で測定した。
サンプルを厚さ3mmに切り出し、1mmφのピンに10gの加重を与え、30℃から10℃/分で昇温してTMA測定(セイコーインスツルメンツ製、TMA/SS6100)を行い、軟化点を測定した。
JIS規格K-7171に準拠し、厚さ2.5mm、幅10.0mmの平板を、オートグラフ(株式会社島津製作所製、AG-5000B)を用い、支点間距離40mmにおいて3点曲げ試験を行い、破断点の伸びを測定した。
前記特許文献4(特開2008-101190号公報)に示されている評価方法に準拠して、ドリルの回転数2500rpm、進入速度600mm/分で2.5mm厚の平板に直径2mmの穴を開けたときの周辺部の状態を測定した。周辺部に欠けが見られないものを○、見られたものを×とした。
(a)化合物として硫黄16重量部、(b)化合物としてビス(β-エピチオプロピル)スルフィド84重量部の合計100重量部に、紫外線吸収剤として2-(2-ヒドロキシ-5-tert-オクチルフェニル)ベンゾトリアゾール1重量部を加え、60℃でよく混合し均一とした。次いで、2-メルカプト-1-メチルイミダゾール0.5重量部を加え、(a)化合物が20℃において析出しなくなるまで60℃で予備重合反応させた。
なお、本実施例では、予備重合反応を(a)化合物が約50モル%反応したところで停止させており、得られた組成物中には(a)化合物が残存した状態にある。(a)化合物の反応割合は、反応液を液体クロマトグラフィー分析ならびに屈折率を測定することにより求めた。
(a)化合物16重量部、(b)化合物84重量部、(c)化合物としてc-1化合物1重量部、紫外線吸収剤として2-(2-ヒドロキシ-5-tert-オクチルフェニル)ベンゾトリアゾール1重量部を加え、50℃でよく混合し均一とした。次いで、2-メルカプト-1-メチルイミダゾール0.05重量部を加え、(a)化合物が20℃において析出しなくなるまで50℃で予備重合反応させた。
なお、本実施例では、予備重合反応を(a)化合物が約50モル%反応したところで停止させており、得られた組成中には(a)化合物が残存した状態にある。
その後、得られた組成物を20℃に冷却した。そこへ、未添加分のc-1化合物7重量部、重合触媒としてトリエチルベンジルアンモニウムクロライド0.050重量部、重合調節剤としてジ-n-ブチルスズジクロライド0.22重量部を加え、実施例1と同様な処理、重合硬化を行い、光学材料を得た。得られた光学材料の屈折率およびアッベ数、耐熱性、伸びおよび耐ドリル強度の評価結果を表1に示した。
(c)化合物の量を変更する以外は実施例1と同様に行った。得られた光学材料の屈折率およびアッベ数、耐熱性、伸びおよび耐ドリル強度の評価結果を表1に示した。
(c)化合物のc-1化合物の代わりに、p-キシリレンジチオール(以下c-2化合物と呼ぶ)を使用する以外は、実施例1と同様に行った。得られた光学材料の屈折率およびアッベ数、耐熱性、伸びおよび耐ドリル強度の評価結果を表1に示した。
組成から(c)化合物のc-1化合物を除く以外は実施例1と同様に行った。得られた光学材料の屈折率およびアッベ数、耐熱性および伸びの評価結果を表1に示した。得られた光学材料は伸びおよび耐ドリル強度が不十分であった。
(c)化合物のc-1化合物の代わりに、ビス(2-メルカプトエチル)スルフィド(以下o-1化合物と呼ぶ)を使用する以外は実施例1と同様に行った。ただし屈折率と耐熱性を確保するために4000Pa、90分間、20℃の条件下で脱気処理した。得られた光学材料の屈折率およびアッベ数、耐熱性、伸びおよび耐ドリル強度の評価結果を表1に示した。得られた光学材料は伸びおよび耐ドリル強度が不十分であった。
o-1化合物の量を変更した以外は比較例2と同様に行った。得られた光学材料の屈折率およびアッベ数、耐熱性、伸びおよび耐ドリル強度の評価結果を表1に示した。得られた光学材料は耐熱性および伸びおよび耐ドリル強度が不十分であった。
(b)化合物100重量部、c-1化合物16重量部、内部離型剤としてポリオキシエチレンラウリルエーテルリン酸ナトリウム0.005重量部、重合調節剤としてジ-n-ブチルスズジクロライド0.05重量部を混合し、均一な組成物とし1300Paの減圧下で30分脱気を行った後、実施例1と同様に重合硬化させた。得られた光学材料の屈折率およびアッベ数、耐熱性、伸びおよび耐ドリル強度の評価結果を表1に示した。得られた光学材料は屈折率および耐熱性が不十分であった。
表1に示した組成に変更した以外は比較例4を繰り返した。得られた光学材料の屈折率およびアッベ数、耐熱性、伸びおよび耐ドリル強度の評価結果を表1に示した。得られた光学材料はいずれも屈折率が不十分であり、耐熱性や耐ドリル強度が不十分なものもあった。
(a)化合物16重量部、(b)化合物84重量部を実施例1と同じ予備重合操作を行い、均一な組成物とした。そこへ、o-1化合物15重量部、o-2化合物12重量部、重合触媒としてトリエチルベンジルアンモニウムクロライド0.035重量部、重合調節剤としてジ-n-ブチルスズジクロライド0.22重量部を加えよく混合し均一化させると、急速重合が起こり硬化した光学材料は得られなかった。
(a)硫黄
(b)ビス(β-エピチオプロピル)スルフィド
(c-1)m-キシリレンジチオール
(c-2)p-キシリレンジチオール
(o-1)ビス(2-メルカプトエチル)スルフィド
(o-2)1,3-ビス(1-イソシアナート-1-メチルエチル)ベンゼン
Claims (13)
- (a)1~50重量部の硫黄原子および/またはセレン原子を有する無機化合物、
(b)50~99重量部のビス(β-エピチオプロピル)スルフィド、ビス(β-エピチオプロピル)ジスルフィド、ビス(β-エピチオプロピル)トリスルフィド、ビス(β-エピチオプロピルチオ)メタン、1,2-ビス(β-エピチオプロピルチオ)エタン、1,3-ビス(β-エピチオプロピルチオ)プロパン、1,2-ビス(β-エピチオプロピルチオ)プロパン、1,4-ビス(β-エピチオプロピルチオ)ブタン、およびビス(β-エピチオプロピルチオエチル)スルフィドから選択される1種以上であるエピスルフィド化合物、
(c)前記(a)および(b)化合物の合計を100重量部とした場合に1~50重量部のキシリレンジチオール化合物、を含有する光学材料用組成物。 - 前記(a)無機化合物が硫黄である、請求項1記載の光学材料用組成物。
- 前記(b)エピスルフィド化合物がビス(β-エピチオプロピル)スルフィドおよび/またはビス(β-エピチオプロピル)ジスルフィドである、請求項1記載の光学材料用組成物。
- 前記(c)キシリレンジチオール化合物が、m-キシリレンジチオールおよび/またはp-キシリレンジチオールである、請求項1記載の光学材料用組成物。
- 前記(a)無機化合物の含有割合が、光学材料用組成物全量に対して10重量%以上である、請求項1記載の光学材料用組成物。
- キシリレンジイソシアネート化合物が、光学材料用組成物全量に対して1重量%以上含まれないことを特徴とする、請求項1記載の光学材料用組成物。
- 前記(a)無機化合物と(b)エピスルフィド化合物の少なくとも一部が、相互に予備重合反応して得られる予備重合反応物として含まれていることを特徴とする、請求項1記載の光学材料用組成物。
- 下記(a)、(b)及び(c)化合物を混合する工程を含む、光学材料用組成物の調製方法。
(a)1~50重量部(ただし光学材料用組成物全量に対して10重量%以上)の硫黄原子および/またはセレン原子を有する無機化合物
(b)50~99重量部のビス(β-エピチオプロピル)スルフィド、ビス(β-エピチオプロピル)ジスルフィド、ビス(β-エピチオプロピル)トリスルフィド、ビス(β-エピチオプロピルチオ)メタン、1,2-ビス(β-エピチオプロピルチオ)エタン、1,3-ビス(β-エピチオプロピルチオ)プロパン、1,2-ビス(β-エピチオプロピルチオ)プロパン、1,4-ビス(β-エピチオプロピルチオ)ブタン、およびビス(β-エピチオプロピルチオエチル)スルフィドから選択される1種以上であるエピスルフィド化合物
(c)前記(a)および(b)化合物の合計を100重量部とした場合に1~50重量部のキシリレンジチオール化合物 - さらに前記(a)無機化合物と(b)エピスルフィド化合物の少なくとも一部を予備重合反応させる工程を含むことを特徴とする、請求項8記載の光学材料用組成物の調製方法。
- 下記工程(A)及び(B)を含む、光学材料の製造方法。
(A)下記(a)、(b)及び(c)化合物を混合して光学材料用組成物を調製する工程、
(a)1~50重量部(ただし光学材料用組成物全量に対して10重量%以上)の硫黄原子および/またはセレン原子を有する無機化合物
(b)50~99重量部のビス(β-エピチオプロピル)スルフィド、ビス(β-エピチオプロピル)ジスルフィド、ビス(β-エピチオプロピル)トリスルフィド、ビス(β-エピチオプロピルチオ)メタン、1,2-ビス(β-エピチオプロピルチオ)エタン、1,3-ビス(β-エピチオプロピルチオ)プロパン、1,2-ビス(β-エピチオプロピルチオ)プロパン、1,4-ビス(β-エピチオプロピルチオ)ブタン、およびビス(β-エピチオプロピルチオエチル)スルフィドから選択される1種以上であるエピスルフィド化合物
(c)前記(a)および(b)化合物の合計を100重量部とした場合に1~50重量部のキシリレンジチオール化合物
(B)前記光学材料用組成物を重合硬化させる工程 - 前記工程(A)が、さらに前記(a)無機化合物と(b)エピスルフィド化合物の少なくとも一部を予備重合反応させる工程を含むことを特徴とする、請求項10記載の光学材料の製造方法。
- 請求項10又は11記載の製造方法によって得られる光学材料であって、屈折率(ne)が1.73以上である、光学材料。
- 請求項12記載の光学材料からなる、ツーポイントフレームメガネ用レンズ。
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