阅读说明：本技术 用于环氧丙烯酸类中等折射光学透镜的树脂组合物及其制备方法 (Resin composition for epoxy acrylic medium refractive optical lens and preparation method thereof ) 是由 张东奎 卢守均 于 2018-04-09 设计创作，主要内容包括：本发明涉及环氧丙烯酸类光学透镜,尤其,涉及用于固相折射率为1.53～1.58、且离型性、热稳定性、耐光性及压缩强度优秀的环氧丙烯酸类中等折射光学透镜的树脂组合物及其制备方法。本发明提供包含50重量百分比至70重量百分比的酸价为0.01～2.5的双酚A环氧丙烯酸酯、21重量百分比至45重量百分比的甲基丙烯酸甲酯、1重量百分比至17重量百分比的反应性稀释剂的用于固相折射率1.53～1.58的环氧丙烯酸类中等折射光学透镜的树脂组合物。根据本发明,通过抑制环氧丙烯酸酯的酸价并在组合物中包含大量MMA,从而能够以良好状态维持透明性及阿贝数,且能够以低生产费用制备离型性、热稳定性、耐光性优秀且压缩强度高的环氧丙烯酸类中等折射光学透镜。本发明的氧丙烯酸类中等折射光学透镜可代替以往的中等折射光学透镜而在各种领域中被广泛利用。(The present invention relates to an epoxy acrylic optical lens, and more particularly, to a resin composition for an epoxy acrylic medium refractive optical lens having a solid phase refractive index of 1.53 to 1.58 and excellent release properties, thermal stability, light resistance and compressive strength, and a method for preparing the same. The invention provides a resin composition for an epoxy acrylic medium refractive optical lens having a solid phase refractive index of 1.53-1.58, which comprises 50-70 wt% of bisphenol A epoxy acrylate having an acid value of 0.01-2.5, 21-45 wt% of methyl methacrylate, and 1-17 wt% of a reactive diluent. According to the present invention, an epoxy acrylic medium refractive optical lens having excellent releasability, thermal stability, light resistance and high compressive strength can be produced at low production cost while maintaining transparency and abbe number in a good state by suppressing the acid value of an epoxy acrylate and by including a large amount of MMA in the composition. The intermediate refractive optical lens of the present invention can be widely used in various fields instead of the conventional intermediate refractive optical lens.)

1. A resin composition for an epoxy acrylic medium refractive optical lens having a solid phase refractive index of 1.53 to 1.58, comprising:

50 to 70 weight percent of bisphenol A epoxy acrylate represented by the following chemical formula 1 and having an acid value of 0.01 to 2.5;

21 to 45 weight percent of methyl methacrylate; and

1 to 17 weight percent of a reactive diluent,

chemical formula 1:

in the formula, n is 0 to 15.

2. The resin composition according to claim 1, wherein the reactive diluent is one or more compounds selected from the group consisting of styrene, divinylbenzene, α -methylstyrene dimer, benzyl methacrylate, chlorostyrene, bromostyrene, methoxystyrene, monobenzyl maleate, monobenzyl fumarate, dibenzyl maleate, dibenzyl fumarate, methylbenzyl maleate, dimethyl maleate, diethyl maleate, dibutyl fumarate, monobutyl maleate, monopentyl maleate, dipentyl maleate, monopentyl fumarate, dipentyl fumarate, and diethylene glycol diaryl carbonate.

3. The resin composition according to claim 1, wherein the reactive diluent is one or more compounds selected from the group consisting of styrene, divinylbenzene, α -methylstyrene, and α -methylstyrene dimer.

4. The resin composition of claim 1, further comprising 0.001 to 10 weight percent of an internal release agent.

5. The resin composition of any one of claims 1 to 4, wherein the composition further comprises 0.01 to 5 weight percent of a thermal stabilizer.

6. The resin composition according to claim 5, wherein the heat stabilizer is one or more compounds selected from the group consisting of triphenyl phosphite, diphenyldecyl phosphite, phenyl didecyl phosphite, diphenyldodecyl phosphite, diphenylisodecyl phosphite, trisnonylphenyl phosphite, diphenylisooctyl phosphite, tributyl phosphite, tripropyl phosphite, triethyl phosphite, trimethyl phosphite, tris (monodecyl phosphite), tris (monophenyl) phosphite.

7. An epoxy acrylic medium refractive optical lens,

the epoxy acrylic medium refractive optical lens is obtained by polymerizing the resin composition for an optical lens in a mold, and has a solid phase refractive index of 1.53 to 1.58,

the resin composition for an optical lens includes:

50 to 70 weight percent of bisphenol A epoxy acrylate represented by the following chemical formula 1 and having an acid value of 0.01 to 2.5;

21 to 45 weight percent of methyl methacrylate; and

1 to 17 weight percent of a reactive diluent,

chemical formula 1:

in the formula, n is 0 to 15.

8. The epoxy acrylic medium refractive optical lens according to claim 7, wherein the reactive diluent is one or more compounds selected from the group consisting of styrene, divinylbenzene, α -methylstyrene, and α -methylstyrene dimer.

9. The epoxy acrylic meso-refractive optical lens of claim 7 or 8 wherein the resin composition further comprises 0.01 to 5 weight percent of a thermal stabilizer.

10. The epoxy acrylic medium refractive optical lens according to claim 9, wherein the heat stabilizer is one or more compounds selected from the group consisting of triphenyl phosphite, diphenyldecyl phosphite, phenyldidecyl phosphite, diphenyldodecyl phosphite, diphenylisodecyl phosphite, trisnonylphenyl phosphite, diphenylisooctyl phosphite, tributyl phosphite, tripropyl phosphite, triethyl phosphite, trimethyl phosphite, tris (monodecyl phosphite), tris (monophenyl) phosphite.

11. The epoxy acrylic medium refractive optical lens of claim 9, wherein the resin composition further comprises 0.001 to 10 weight percent of an internal release agent.

12. A method for producing an acrylic intermediate refractive optical lens, comprising the step of placing the resin composition according to claim 1 in a mold and polymerizing the resin composition.

Technical Field

The present invention relates to an epoxy acrylic optical lens, and more particularly, to a resin composition for an epoxy acrylic medium refractive optical lens having a refractive index of 1.53 to 1.58 and excellent release properties, compressive strength, thermal stability, transparency, and color, and a method for preparing the same.

Background

A lens disclosed in 1936 using polymethyl-methacrylate (PMMA) as an acrylic resin is also called an acrylate lens, has an abbe number of 57, and thus has high transparency, a refractive index as low as 1.49, and low heat resistance and surface strength as compared to CR-39 of similar refractive index.

In 1992, the DISO company of Japan first developed an acrylic high-refractive resin lens by mixing tetrabromobisphenol A diacrylate (diacid of tetrabromobisphenol A) with a reactive diluent such as styrene, but it was not put into practical use because of insufficient thermal stability and light resistance of the lens.

Then, Japanese patent laid-open Nos. Hei 6-49133 and Hei 7-206974 disclose only methods for producing lenses by mixing tetrabromobisphenol A diacrylate with divinylbenzene, styrene, phenyl methacrylate, isocyanate and the like. Such optical lenses are improved in light resistance and heat resistance, but have a problem of color change when hard-coated due to low thermal stability.

In order to solve these problems, a lens having refractive index of 1.58 to 1.61, in which thermal stability and light resistance of a spectacle lens are greatly improved by mixing tetrabromobisphenol A diacrylate with a reactive diluent such as styrene and methylstyrene and adding an acid phosphate, is disclosed in Korean laid-open patent No. 10-2004-0083942. The epoxy acrylate lens has high refractive index, high Abbe number, excellent optical properties such as transparency, light weight and heat resistance, and low material cost.

However, when an epoxy acrylate lens is produced, the releasability, thermal stability and light resistance are deteriorated for unknown reasons. Further, a reactive diluent for adjusting viscosity and reaction rate is required, and one or more of styrene, divinylbenzene, α -methylstyrene dimer, benzyl methacrylate, chlorostyrene, bromostyrene, methoxystyrene, dibenzylmaleate, and the like are used alone or in combination. The diluent chosen will have an impact on the productivity and optical properties of the lens and will also impact the cost of production. For example, styrene, which is currently frequently used and is present in high amounts in the resin, reduces the strength.

On the other hand, various resins such as polyethylene glycol bisallylcarbonate, polymethyl methacrylate, diallyl phthalate, polystyrene, and polycarbonate have been used for conventional optical lenses having a medium refractive index range.

An optical resin composition provided in european patent 06905a2, in which 5 to 40 parts by weight of an acrylic and bisphenol a type epoxy reactant, 5 to 40 parts by weight of an acrylic and bistetrabromobisphenol a type epoxy reactant, 5 to 20 parts by weight of diallyl dibenzoate (phenate), vinyl toluene and polystyrene are mixed in 15 to 50 parts by weight of styrene, but the composition has a problem of insufficient thermal stability.

Japanese Kokai publication Sho-53-7787 discloses an optical lens obtained by polymerizing 85 wt% of diallyl isophthalate and 15 wt% of diethylene glycol bisallylcarbonate, in which case the lens is successfully made thinner and thinner, but still has a disadvantage of weak impact resistance.

Plastic lenses made from a copolymer formed from modified dipropylene phthalate and dibenzyl fumarate and lenses made from a copolymer formed from dipropylene phthalate and methyl acrylate are provided in japanese laid-open patents sho 62-235901 and sho 64-45412 and japanese patent hei 1-60494, and they still have a problem of weak impact resistance.

Korean granted patent No. 10-0431434 discloses a monomer composition for a medium refractive optical lens, which is formed of diallyl ester oligomer, dialkyl maleate, diethylene glycol bisallyl carbonate, and diallyl adipate, and has a refractive index ranging from 1.53 to 1.55. Although the impact resistance of the optical lens is improved as compared with a conventional intermediate refractive lens, the abbe number and transparency are rather reduced and the heat resistance is low.

In the case of epoxy acrylate lenses, optical properties such as transparency and abbe number are good, so that the quality in terms of release property, compressive strength, thermal stability and light resistance is improved and the production cost is reduced, and the lenses are more competitive with lenses of other materials having a medium refractive index of about 1.53 to 1.58.

Disclosure of Invention

Problems to be solved by the invention

The present invention aims to show that the problem of the decrease of releasability, thermal stability and light resistance, which is caused by unknown reasons when an epoxy acrylate-based lens is produced, is related to the acid value of the epoxy acrylate and to solve the problem.

Methyl methacrylate is used as a reactive diluent together with conventional styrene, divinylbenzene, α -methylstyrene dimer, and the like, and when the content in the resin is 20% by weight or more, physical properties are problematic on many sides such as whitening and uneven polymerization, and therefore, it is mostly used only in a small amount. However, in the case of using a large amount of methyl methacrylate, the compressive strength is more excellent than in the case of using styrene, and therefore, the compressive strength can be improved without increasing the production cost. The present invention aims to provide a resin composition for an epoxy acrylate type medium refractive optical lens, which contains 20% by weight or more of methyl methacrylate in the lens resin composition, has excellent transparency, Abbe number, thermal stability, light resistance and mold release property, and is excellent in compressive strength and economical.

Means for solving the problems

In order to achieve the above object, the present invention provides a resin composition for an epoxy acrylic medium refractive optical lens having a solid phase refractive index of 1.53 to 1.58, the resin composition comprising: 50 to 70 weight percent of bisphenol A epoxy acrylate represented by the following chemical formula 1 and having an acid value of 0.01 to 2.5; 21 to 45 weight percent of methyl methacrylate; 1 to 17 weight percent of a reactive diluent:

chemical formula 1:

wherein n is 0 to 15.

The resin composition for an epoxy acrylic medium refractive optical lens may further include 0.001 to 10 weight percent of an internal release agent.

Also, the resin composition for an epoxy acrylic medium refractive optical lens may further include 0.01 to 5 weight percent of a heat stabilizer.

The present invention provides an epoxy acrylic medium refractive optical lens having a solid phase refractive index of 1.53 to 1.58, which is obtained by polymerizing a resin composition for an optical lens in a mold, the resin composition for an optical lens comprising: 50 to 70 weight percent of bisphenol A epoxy acrylate represented by the following chemical formula 1 and having an acid value of 0.01 to 2.5; 21 to 45 weight percent of methyl methacrylate; 1 to 17 weight percent of a reactive diluent:

chemical formula 1:

wherein n is 0 to 15.

Also, the present invention provides a method for manufacturing an acrylic medium refractive optical lens, comprising the step of placing a resin composition for an epoxy acrylic medium refractive optical lens in a mold and polymerizing.

Effects of the invention

The present invention provides a resin composition for epoxy acrylic medium refractive optical lenses, which can reduce production costs by suppressing the acid value of bisphenol A diglycidyl ether and containing MMA in an amount of 20 wt% or more in the composition, and which can greatly improve the compression strength of medium refractive lenses having a solid phase refractive index of 1.53 to 1.58 and is excellent in mold release property, thermal stability, light resistance, transparency and Abbe number.

Detailed Description

The resin composition for epoxy acrylate medium refractive optical lenses according to the present invention comprises: a bisphenol a epoxy acrylate resin (BPDA) represented by the following chemical formula 1; methyl Methacrylate (MMA); and a reactive diluent.

Chemical formula 1:

wherein n is 0 to 15.

The bisphenol a epoxy acrylate is generally obtained by reacting bisphenol a diglycidyl ether represented by the following chemical formula 2 with acrylic acid in the following reaction formula 1:

chemical formula 2

Wherein n is 0 to 15.

Reaction scheme 1

The acid value of bisphenol a epoxy acrylate thus prepared differs depending on the preparation process. The present inventors have found that the problem of the deterioration of releasability, thermal stability and light resistance, which is not known to be caused, often occurs when an epoxy acrylate-based lens is produced, is related to the acid value of bisphenol a epoxy acrylate. In the present invention, the acid value of the bisphenol A epoxy acrylate is preferably 0.01 to 2.5, and more preferably 0.05 to 2.4. The acid value can be suppressed by adjusting the equivalent weight of acrylic acid when preparing bisphenol A epoxy acrylate. In the present invention, it was confirmed that, in the reaction of the epoxy compound (YD128) with acrylic acid, when the molar ratio of 1: when the epoxy equivalent and the acrylic equivalent are reacted in a ratio of 0.9 to 1.0, oligomerization or a polymer is generated in a part of the reaction, resulting in a problem of reactivity. However, if adjusted to 1: the epoxy equivalent and the acrylic equivalent are reacted at a ratio of 1.005 to 1.06, whereby bisphenol A epoxy acrylate having an acid value of 0.01 to 2.5 can be obtained without the above-mentioned problems. And an optical lens prepared by using the bisphenol A epoxy acrylate has excellent release property, thermal stability, light resistance, transparency and color.

In the present invention, the acid value of bisphenol A epoxy acrylate was measured by the following method.

Determination of acid number

To a clean, dry 200mL beaker was placed 100mL of a beaker measuring 1: 1 volume ratio of ethanol and toluene solution and stirring. To this solution 3 drops of phenolphthalein (prepared with ethanol at 1% concentration) were added and 2 drops of 0.5N KOH (aq.) were added. At this time, the solution became pale pink, and when 3.0g of the sample was added, the color disappeared. After the solution was completely dissolved by heating and cooled, it was titrated with a 0.5N KOH (aq.) solution.

Formula 1

The resin composition for epoxy acrylic medium refractive optical lenses of the present invention comprises 50 to 70 weight percent of the bisphenol a epoxy acrylate (BPDA), preferably 55 to 65 weight percent.

Methyl Methacrylate (MMA) contained in the resin composition of the present invention is used as a reactive diluent in conventional epoxy acrylic optical resins together with styrene, divinylbenzene, α -methylstyrene dimer, and the like. However, MMA is not contained in a large amount like styrene or divinylbenzene, but is generally used only in a range of about at least 3% to at most less than 20%. This is because, when MMA is contained in an amount of 20 wt% or more in the resin for an optical lens, problems occur in the physical properties of the lens in various aspects such as whitening and uneven polymerization. However, in the present invention, the resin contains a large amount of MMA of 20 wt% or more, and the acid value of the bisphenol a epoxy acrylate is limited to 0.01 to 2.5, and the resin contains the bisphenol a epoxy acrylate in an amount of 50 wt% to 70 wt%, so that the releasability, the thermal stability and the light resistance can be improved. Meanwhile, MMA is contained in a large amount instead of styrene, so that the compressive strength can be improved even without increasing the production cost. Preferably, the resin composition of the present invention comprises 21 to 45 weight percent MMA, more preferably, 25 to 40 weight percent.

The reactive diluent contained in the resin composition of the present invention has an effect of appropriately adjusting the viscosity and polymerization rate of the composition, and is applicable without particular limitation as long as it is used as a reactive diluent in a resin for an epoxy acrylic optical lens.

Preferably, the reactive diluent may be used alone or in combination with one or more selected from the group consisting of styrene, divinylbenzene, α -methylstyrene dimer, benzyl methacrylate, chlorostyrene, bromostyrene, methoxystyrene, monobenzyl maleate, monobenzyl fumarate, dibenzyl maleate, dibenzyl fumarate, methylbenzyl maleate, dimethyl maleate, diethyl maleate, dibutyl fumarate, monobutyl maleate, monopentyl maleate, dipentyl maleate, monopentyl fumarate, dipentyl fumarate, and diethylene glycol diaryl carbonate. More preferably, the reactive diluent is one or more compounds selected from the group consisting of styrene, divinylbenzene, α -methylstyrene, and α -methylstyrene dimer.

The resin composition of the present invention must contain MMA having a reactive diluent effect, and therefore, preferably, a small amount of 1 to 17 weight percent of other reactive diluent is contained. In the case where the total content of the reactive diluent including MMA and other reactive diluents is more than 60 wt%, the adhesive tape may be melted due to excessively low viscosity of the composition, in which case a tape whitening phenomenon and a liquid leakage phenomenon during curing after injection may occur, and thus, whitening, streaking, etc. may occur in the lens.

The resin composition of the present invention comprising MMA and a reactive diluent has a liquid phase viscosity of 20 to 200cps at a temperature of 25 ℃ suitable for mold polymerization, a liquid phase refractive index (nD, 20 ℃) of 1.48 to 1.55, and a solid phase refractive index (nE, 20 ℃) of 1.53 to 1.58. If the viscosity of the liquid phase is less than 20cps, there is a problem that the composition flows out of the mold when the liquid phase resin composition is injected into a glass mold assembled by a synthetic resin gasket to be molded, and if the viscosity of the liquid phase is more than 200cps, it is difficult to inject the composition into the mold. More preferably, the viscosity is 30 to 100 cps.

The resin composition of the present invention may further comprise an internal release agent. An internal release agent is added to the resin composition before the cast polymerization, so that the release property can be greatly improved after the polymerization. Preferably, the polymeric composition may comprise 0.001 to 10 weight percent of the internal release agent.

The internal release agent may be used alone or in combination with two or more of a phosphate ester compound, a silicon surfactant, a fluorine surfactant, an alkyl quaternary ammonium salt, and the like.

The fluorine nonionic surfactant is a compound with perfluoroalkyl in the molecule, Unitine DS-401^TM(Japan, Dajin Industrial Co., Ltd.), Unitine DS-403^TM(Daiki Industrial Co., Ltd., Japan), Eftof EF 122A^TM(New autumn chemical Co., Ltd., Japan) Eftof EF 126^TM(New autumn chemical Co., Ltd., Japan) Eftof EF 301^TM(New autumn chemical Co., Ltd.) and the like.

The silicon-based nonionic surfactant is a compound having a dimethylpolysiloxane group in the molecule, and includes Dow Q2-120A^TMAnd the like.

The quaternary alkylammonium salts are generally used as cationic surfactants and include halogen salts, phosphates, sulfates and the like, and examples of chloride salts include cetyltrimethylammonium chloride, octadecyltrimethylammonium chloride, dimethylethyltrimethylammonium chloride, triethyldecylammonium chloride, methyltrioctylammonium chloride, decylammonium chloride and the like.

Preferably, the internal mold release agent may use a phosphate compound. The phosphate ester compound includes, as a compound having a phosphate group, for example, isopropyl phosphate, diisopropyl phosphate, butyl phosphate, dibutyl phosphate, octyl phosphate, dioctyl phosphate, isodecyl phosphate, diisodecyl phosphate, tridecyl diphosphate, a mixture of two or more thereof, and the like. Preferably, as the phosphate ester compound, one selected from the group consisting of nonylphenol polyoxyethylene ether phosphate (5 weight percent of 5 mole ethylene oxide-added substance, 80 weight percent of 4 mole ethylene oxide-added substance, 10 weight percent of 3 mole ethylene oxide-added substance and 5 weight percent of 1 mole ethylene oxide-added substance), polyoxyethylene nonylphenol phosphate (5 weight percent of 9 mole ethylene oxide-added substance, 80 weight percent of 8 mole ethylene oxide-added substance, 10 weight percent of 7 mole ethylene oxide-added substance and 5 weight percent of 6 mole or less ethylene oxide-added substance), nonylphenol polyoxyethylene ether phosphate (3 weight percent of 11 mole ethylene oxide-added substance, 80 weight percent of 10 mole ethylene oxide-added substance, 5 weight percent of 9 mole added substance, and the like, can be used, 6 weight percent of an additional 7 moles of material, 6 weight percent of an additional 6 moles of material), nonylphenol polyoxyethylene ether phosphate (3 weight percent of an additional 13 moles of ethylene oxide material, 80 weight percent of an additional 12 moles of material, 8 weight percent of an additional 11 moles of material, 3 weight percent of an additional 9 moles of material, 6 weight percent of an additional 4 moles of material), nonylphenol polyoxyethylene ether phosphate (3 weight percent of an additional 17 moles of ethylene oxide material, 79 weight percent of an additional 16 moles of material, 10 weight percent of an additional 15 moles of material, 4 weight percent of an additional 14 moles of material, 4 weight percent of an additional 13 moles of material), nonylphenol polyoxyethylene ether phosphate (5 weight percent of an additional 21 moles of ethylene oxide material, and mixtures thereof, 78 weight percent of additional 20 moles of material, 7 weight percent19 moles of additional material, 6 weight percent of additional 18 moles of material, 4 weight percent of additional 17 moles of material) and dioctyl phosphate and George Youyen^TM(Zelec UN^TM) One or more than two compounds in the group.

The resin composition of the present invention may further comprise a heat stabilizer. Preferably, the heat stabilizer is contained in the resin composition of the present invention in an amount of 0.01 to 5.00 weight percent. When the heat stabilizer is used in an amount of less than 0.01% by weight, the effect of the heat stabilizer is weak, and when the heat stabilizer is used in an amount of more than 5.00% by weight, the polymerization defect rate during curing is high, and the heat stability of a cured product is rather lowered.

For example, the heat stabilizer may be one or more compounds selected from the group consisting of calcium stearate, barium stearate, zinc stearate, cadmium stearate, lead stearate, magnesium stearate, aluminum stearate, potassium stearate, zinc octoate, and the like, which are metal fatty acid salts.

Preferably, one or more compounds selected from triphenyl phosphite, diphenyldecyl phosphite, phenyldidecyl phosphite, diphenyldodecyl phosphite, diphenylisodecyl phosphate, trisnonylphenyl phosphite, diphenylisooctyl phosphite, tributyl phosphite, tripropyl phosphite, triethyl phosphite, trimethyl phosphite, tris (monodecyl phosphite), tris (monophenyl) phosphite, and the like, which are phosphorus-based, may be used. More preferably, diphenylisodecyl phosphate may be used.

Also, 3PbO. PbSO selected as lead group can be used₄.4H₂O、2PbO.Pb(C₈H₄O₄)、3PbO.Pb(C₄H₂O₄).H₂O, etc.

Further, one or more compounds selected from the group consisting of dibutyltin dilaurate, dibutyltin maleate, dibutyltin bis (isooctylmaleate), dioctyltin maleate, dibutyltin bis (monomethyl maleate), dibutyltin bis (laurenethiol), dibutyltin bis (isooctylmercaptoacetate), monobutyltin tris (isooctylmercaptoacetate), dimethyltin bis (isooctylmercaptoacetate), trioctyylmercaptoacetate, dioctylmercaptoacetate, dibutyltin bis (2-mercaptoacetate), butyltin tris (2-mercaptoacetate), dimethyltin bis (2-mercaptoacetate), methyltin tris (2-mercaptoacetate) and the like, which are organic tin compounds, can be used.

Further, 2 or more different types of heat stabilizers may be mixed and used. Most preferably, the use of a phosphorus-based heat stabilizer not only improves the initial color of the molded lens, but also greatly improves the thermal stability of the optical lens without degrading the optical properties such as transparency, impact strength, heat resistance, and polymerization yield.

Further, the resin composition of the present invention may further contain an ultraviolet absorber, an organic dye, an inorganic pigment, a stainblocker, an antioxidant, a light stabilizer, a catalyst, etc., according to the ordinary technique in the field of plastic optical lenses and as needed.

The epoxy acrylic medium refractive lens of the present invention can be prepared by placing the resin composition of the present invention in a mold and polymerizing. According to a preferred embodiment of the present invention, after the resin composition is injected into the mold, the mold is placed in a forced circulation oven and slowly heated from a temperature of 30 ℃ to 120 ℃ and cured, and then cooled to a temperature of 70 ± 10 ℃ and the mold is removed to obtain a lens. Preferably, in this case, a high-purity compound having a purity of 70% to 99.99% is used for all raw materials. Preferably, all raw materials are confirmed for purity and the low purity compound is purified, while the high purity compound is used as it is.

The epoxy acrylate medium refractive optical lens prepared by the preparation method is a medium refractive lens with a solid phase refractive index of 1.53-1.58, and can be used in various fields instead of the conventional medium refractive lens. Specifically, the resin composition is applicable to plastic resin spectacle lenses, three-dimensional polarizing lenses in which polarizers are attached to spectacle lenses, camera lenses, and the like, and is also applicable to various optical products such as recording medium substrates used for prisms, optical fibers, optical disks, and the like, coloring filters, and ultraviolet absorbing filters.