WO2009035286A2 - A composition for plastic lens comprising crystalline mineral powder and a plastic lens prepared using the composition - Google Patents

A composition for plastic lens comprising crystalline mineral powder and a plastic lens prepared using the composition Download PDF

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Publication number
WO2009035286A2
WO2009035286A2 PCT/KR2008/005401 KR2008005401W WO2009035286A2 WO 2009035286 A2 WO2009035286 A2 WO 2009035286A2 KR 2008005401 W KR2008005401 W KR 2008005401W WO 2009035286 A2 WO2009035286 A2 WO 2009035286A2
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Prior art keywords
crystal
composition
plastic lens
lens
powder
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PCT/KR2008/005401
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French (fr)
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WO2009035286A3 (en
Inventor
Shang Hi Rhee
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Shang Hi Rhee
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/16—Solid spheres
    • C08K7/18—Solid spheres inorganic
    • C08K7/20—Glass
    • 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

Definitions

  • the present invention relates to a composition for a plastic lens and a lens prepared by using the same, and more particularly to a plastic lens composition including crystalline mineral powder, especially, crystal (quartz) powder, and a plastic lens prepared by using the composition.
  • the plastic lens according to the present invention has a high refractive index and is effective in protecting eyesight due to its crystalline mineral powder.
  • a plastic lens has been widely used for a lens field because it has better physical properties in weight, formability, impact-resistance, dyeability, etc. as compared to a glass lens.
  • Representative examples of a resin for a plastic lens include polyethyleneglycolbisallylcarbonate, polystyrene, polycarbonate, etc.
  • Polyethyleneglycolbisallylcarbonate has high physical properties in weight, formability, impact- resistance, dyeability, etc. but has a refractive index within a range of only 1.49 to 1.50. Thus, there is a problem in that when polyethyleneglycolbisallylcarbonate is used as a lens, center thickness is increased. Polystyrene and polycarbonate have a high refractive index within a range of 1.58 to 1.59. However, polystyrene and polycarbonate, when molded, may have a problem in that optical distortion may occur by birefringence because they are thermoplastic resins, and an adhesion property of a hard-coat film formed on the surface thereof is low.
  • Japanese Patent Laid-open Publication SHO. 64-45,412 Japanese Patent Laid-open Publication SHO. 64-45,412
  • a method of copolymerizing diallylphthalate and aromatic monocarboxylic acid allyl ester Japanese Patent Laid- open Publication HEI. 1-60,494
  • a method of copolymerizing diallylisophthalate, allylbenzoate and allyl malate Japanese Patent Laid-open Publication Hei 1-93,597
  • a resin composition prepared by these methods when prepared into a lens, has a yellow color, and thus there is a limitation in applying the resin composition as a lens.
  • a plastic lens is advantageous in wearing and eye-protecting because it is lightweight and is not subject to breakdown, as compared to an inorganic glass lens, and also is highly applicable to accessories due to its easiness in formability and coloration.
  • the plastic lens has a limitation in its use range due to low scratch resistance and low resistance against organic solvents in spite of its capability of solving problems (such as low impact resistance, a high specific gravity, etc.) of a glass lens.
  • European Patent EP06905A2 disclosed a resin composition for preparing a lens, which includes styrene, a reaction product of acrylic acid and a bisphenol-A type epoxy resin, a reaction product of acrylic acid and a bistetrabromobisphenol-A type epoxy resin, and compounds, such as divinylbenzene, diaryldiphenylate, vinyltoluene, chlorostyrene, etc.
  • a lens prepared by the resin composition is thermally unstable.
  • a representative resin used for a glasses lens includes a diethyleneglycolbisallylcarbonate polymer (PPG Industries Co., trade name: CR-39) .
  • a lens prepared by the resin also has a relatively low refractive index of about 1.50. Accordingly, the resin is easily used for a lens having a diopter of -3.00 or less and a thin edge, but is difficult to apply to other lenses with a diopter greater than the above mentioned degree .
  • a lens prepared by these polymers has disadvantages, such as poor polishing-processibility, low scratch resistance due to low surface hardness, and low resistance against an organic solvent.
  • the present invention provides a plastic lens composition having high physical properties in a refractive index, weight, impact-resistance, light safety, UV transmittance, etc. and also being effective in protecting eyesight.
  • a plastic lens resin composition includes minute crystalline mineral powder so as to achieve high optical/mechanical properties and an effect of protecting eyesight.
  • the present invention provides a plastic lens composition which has high optical/mechanical/physical properties and is effective in protecting eyesight, and a lens prepared by the lens composition.
  • the present invention provides a plastic lens composition including a transparent polymer resin and crystalline mineral powder.
  • the present invention provides a plastic lens prepared by the composition.
  • crystal powder may be used as the crystalline mineral powder.
  • the crystal refers to crystallized quartz.
  • the crystal powder may be included in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the transparent polymer resin.
  • the crystal powder includes particles obtained by grinding a crystal.
  • a particle size may range from 10 to lOOOnm.
  • the particle size of the crystal powder may be within a range of about 30 to lOOOnm. If the particle size is less than 30nm, there is a possibility that crystallinity of a crystal may not occur in the crystal powder. If the particle size is greater than lOOOnm, particles of the crystal powder in a prepared lens may be seen with naked eyes, thereby causing confusion in a visual field and a problem such as light scattering.
  • the plastic lens composition includes a polymer resin for forming plastics.
  • the polymer resin any transparent polymer resin conventionally used for preparing a plastic lens may be used without limitation.
  • the plastic lens prepared by using the composition according to the present invention may have a high refractive index of 1.5 or more.
  • a plastic lens composition according to the present invention includes a transparent polymer resin for forming plastics and crystalline mineral powder.
  • any conventional polymer resin for preparing a lens may be used without limitation.
  • a polyethyleneglycolbisallylcarbonate polymer currently mainly used as a glasses lens may be used as the transparent polymer resin.
  • the polyethyleneglycolbisallylcarbonate polymer may be mixed with other polymer resin component (s) .
  • polystyrene polyethyleneglycolbisarylcarbonate, polycarbonate, modified diary phthalate, or a mixture thereof may also be used.
  • a thiourethane resin may be used as a urethane resin.
  • the mixture of the above polymers and resins can also be used.
  • resins There are some conventionally known methods using resins: a method of using diacrylate or dimethacrylate deprived from bisphenol-A; a method of using diacrylate or dimethacrylate deprived from halogenated bisphenol-A, a method of using a combination of a halogenated styrene monomer and multifunctional methacrylate; or a method of using a diallylphthalate monomer.
  • the transparent polymer resin may be appropriately selected and used according to demands of a person skilled in the art. As required, at least two kinds of the polymer resins may be used in combination. In this case, the mixing ratio of the transparent polymer resin may vary according to the use of a lens, a required optical property, etc. The content ratio of the transparent polymer resin may vary according to the content of crystalline mineral powder. According to an embodiment of the present invention, the polymer resin may be included in an amount of 85 to 99.9 wt% based on the total weight of the plastic lens composition.
  • the plastic lens composition according to the present invention includes crystalline mineral powder in addition to the polymer resin for forming plastics.
  • crystalline mineral powder crystal powder may be used as the crystalline mineral powder.
  • a crystal generally denotes quartz or crystal quartz, and it can be said that the crystal is a crystalloid of silicon dioxide (SiO 2 ) .
  • a crystal is crystalline mineral having a Mohs scale hardness of 7.
  • a colorless transparent crystal has been used as a glasses lens.
  • a crystal is used as a glasses lens through polishing, it is possible to achieve scratch resistance and high light-transmittance .
  • a crystal in a powder state is mixed with a transparent polymer resin for a plastic lens.
  • the polymer resin is in a composition state during the process of processing a lens, it is easy to process various shaped lenses applicable to various uses.
  • the lens according to the present invention has an advantage in that it is lightweight in spite of inclusion of a crystalline mineral component, for example, a crystal component.
  • the plastic lens according to the present invention can have high light- transmittance and an increased refractive index.
  • medical properties of a crystal may be revealed.
  • a crystal is generally colorless-transparent or white-semitransparent, and under certain circumstances, may be yellow (citrin) , red or pink (rose quartz), green, blue (blue quartz) , violet (amethyst) , dark brown (smoky quartz), etc. According to the present invention, it is possible to use any kind of crystal may be used without limitation on crystal color.
  • the crystal powder according to the present invention may be obtained by grinding at least one crystal selected from the group including a colorless transparent crystal, a white semitransparent crystal, a yellow crystal (citrin) , a red crystal (rose quartz), a green crystal, a blue crystal (blue quartz), a violet crystal (amethyst) and a dark brown crystal (smoky quartz) .
  • topaz may be used as a crystal.
  • a synthetic crystal industrially synthesized may also be applied to the present invention .
  • crystal powder which may be used as required.
  • quartz may also be included in the crystal according to the present invention.
  • a crystal has a natural frequency.
  • a crystal has been conventionally used for a clock, which is based on the fact that when electricity is applied to a thin crystal layer, vibration automatically occurs.
  • a crystal layer used for a clock upwardly/downwardly vibrates 32,768 times per 1 second.
  • time may be calculated by moving a second hand by 1 second or adding a number corresponding to 1 second, by using a toothed wheel, etc. while such a crystal layer vibrates 32,768 times.
  • such minute vibration of a crystal generates a wavelength with a low frequency, and thus the wavelength with a low frequency is provided to eyes of a user wearing glasses obtained using by the lens.
  • the crystal powder may be used in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the polymer resin. If the content of the crystal powder is too low, there is a possibility that crystal characteristics do not occur in a lens. If the content of the crystal powder is too high, there is a possibility that a lens becomes heavy and polymerization of a lens composition is subject to negative effects.
  • the crystal powder is obtained by grinding a crystal.
  • a particle of the crystal powder may have a size of 10 to lOOOnm, and preferably of 30 to lOOOnm considering crystallinity and optical properties.
  • the plastic lens composition according to the present invention may further include an additive required for convenience in performance improvement, betterment, or preparation of a lens. There is no limitation in the kind of such an additive.
  • the additive may include a cross-linking agent, a colorant, an anti light scattering agent, an antistatic agent, etc. but the present invention is not limited thereto . According to an embodiment of the present invention, such an additive may be included in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the polymer resin.
  • the present invention also provides a plastic lens prepared by the plastic lens composition according to the present invention.
  • the plastic lens according to the present invention may be prepared by a conventional method of preparing a lens by using a plastic lens composition.
  • respective components of the plastic lens composition according to the present invention may be mixed and then formed into a lens.
  • a lens may be obtained by the steps of: melting a transparent polymer resin; adding crystalline mineral powder and an additive (as required) to the molten resin; and molding the molten mixture through a mold.
  • a plastic lens may be obtained by the steps of: firstly dispersing crystalline mineral in a solvent, for example, acetone; mixing the dispersed mineral with a transparent polymer resin in a monomer state; and carrying out polymerization.
  • a solvent for example, acetone
  • a lens may be obtained by the steps of: mixing a transparent polymer resin with crystalline mineral powder, for example, crystal powder; melting the mixture while adding an additive as required; and molding the molten mixture through a mold.
  • the molten mixture may be preliminarily polymerized into a syrup-state mixture and then the syrup-state mixture may be molded through the mold.
  • the lens composition according to the present invention includes crystalline mineral powder in addition to a composition for a plastic lens, and thus may be prepared into a plastic lens capable of showing optical/physical/medical properties of the crystalline mineral .
  • Example 1 30Og of polyethyleneglycolbisallylcarbonate polymer (PPG Industries Co., trade name: CR-39) was fed into a vessel and was melted by heating at 40 ⁇ 50 ° C.
  • PPG Industries Co., trade name: CR-39 polyethyleneglycolbisallylcarbonate polymer
  • the mixture was molded into a lens through a lens forming glass mold with a diameter of 65mm. Then, the lens taken from the mold was washed and dried.
  • a plastic lens was prepared in the same manner as described in Example 1, except that polystyrene (Example 2) and polycarbonate (Example 3) were used instead of polyethyleneglycolbisalIyIcarbonate polymer.
  • a refractive index was measured by a refractometer .
  • Visible ray transmittance was measured by an optical tester.
  • Impact resistance was tested by dropping a ball of 16.3g from the height of 127cm to a lens sample with a center thickness of 2mm in accordance with an FDA standard. As a result, a damaged lens was determined as ⁇ poor' , and an undamaged lens was determined as ⁇ good' .
  • the lenses obtained from the Examples have high physical properties in a refractive index and UV transmittance.
  • the lens composition according to the present invention may be used for preparing a plastic lens.

Abstract

Disclosed is a plastic lens composition including crystalline mineral powder, especially, crystal powder, and a plastic lens prepared by using the composition. The plastic lens composition can have optical/physical/medical properties of crystalline mineral.

Description

A COMPOSITION FOR PLASTIC LENS COMPRISING CRYSTALLINE MINERAL POWDER AND A PLASTIC LENS PREPARED USING THE
COMPOSITION
Technical Field
The present invention relates to a composition for a plastic lens and a lens prepared by using the same, and more particularly to a plastic lens composition including crystalline mineral powder, especially, crystal (quartz) powder, and a plastic lens prepared by using the composition. The plastic lens according to the present invention has a high refractive index and is effective in protecting eyesight due to its crystalline mineral powder.
Background Art
In general, a plastic lens has been widely used for a lens field because it has better physical properties in weight, formability, impact-resistance, dyeability, etc. as compared to a glass lens. Representative examples of a resin for a plastic lens include polyethyleneglycolbisallylcarbonate, polystyrene, polycarbonate, etc.
Polyethyleneglycolbisallylcarbonate has high physical properties in weight, formability, impact- resistance, dyeability, etc. but has a refractive index within a range of only 1.49 to 1.50. Thus, there is a problem in that when polyethyleneglycolbisallylcarbonate is used as a lens, center thickness is increased. Polystyrene and polycarbonate have a high refractive index within a range of 1.58 to 1.59. However, polystyrene and polycarbonate, when molded, may have a problem in that optical distortion may occur by birefringence because they are thermoplastic resins, and an adhesion property of a hard-coat film formed on the surface thereof is low.
Accordingly, research on a resin composition having the same physical properties and processibility as polyethyleneglycolbisallylcarbonate, but having a high refractive index has been recently actively conducted.
For example, there were a method of copolymerizing ethyleneglycolbisallylcarbonate and dimethacrylate containing bisphenol A (Japanese Patent Laid-open Publication SHO. 59-191,708), and a method of copolymerizing benzenedicarboxylate and benzyl methacrylate (US Patent No. 4,522,993) . However, these methods have disadvantages in that it is difficult to control a polymerization reaction due to different polymerization rates of respective components, and unreacted monomers are included in a large amount in a final copolymer. Also, as other examples, there were a method of copolymerizing dibenzyl fumarate and diallylphthalate
(Japanese Patent Laid-open Publication SHO. 64-45,412), a method of copolymerizing diallylphthalate and aromatic monocarboxylic acid allyl ester (Japanese Patent Laid- open Publication HEI. 1-60,494), and a method of copolymerizing diallylisophthalate, allylbenzoate and allyl malate (Japanese Patent Laid-open Publication Hei 1-93,597), etc. However, a resin composition prepared by these methods, when prepared into a lens, has a yellow color, and thus there is a limitation in applying the resin composition as a lens.
Meanwhile, a plastic lens is advantageous in wearing and eye-protecting because it is lightweight and is not subject to breakdown, as compared to an inorganic glass lens, and also is highly applicable to accessories due to its easiness in formability and coloration. However, the plastic lens has a limitation in its use range due to low scratch resistance and low resistance against organic solvents in spite of its capability of solving problems (such as low impact resistance, a high specific gravity, etc.) of a glass lens.
For example, European Patent EP06905A2 disclosed a resin composition for preparing a lens, which includes styrene, a reaction product of acrylic acid and a bisphenol-A type epoxy resin, a reaction product of acrylic acid and a bistetrabromobisphenol-A type epoxy resin, and compounds, such as divinylbenzene, diaryldiphenylate, vinyltoluene, chlorostyrene, etc. However, a lens prepared by the resin composition is thermally unstable.
At present, a representative resin used for a glasses lens includes a diethyleneglycolbisallylcarbonate polymer (PPG Industries Co., trade name: CR-39) . However, a lens prepared by the resin also has a relatively low refractive index of about 1.50. Accordingly, the resin is easily used for a lens having a diopter of -3.00 or less and a thin edge, but is difficult to apply to other lenses with a diopter greater than the above mentioned degree .
As polymers capable of being used for preparing a lens having a relatively high refractive index, polycarbonate (nD=1.58), polystyrene (nD=1.60), etc. are known. However, a lens prepared by these polymers has disadvantages, such as poor polishing-processibility, low scratch resistance due to low surface hardness, and low resistance against an organic solvent.
In order to overcome such disadvantages, various researches for preparing a stereo cross-linked plastic lens having high scratch resistance and a high refractive index is currently being conducted.
Also, considering not only optical properties but also medical properties, a glasses lens which can reduce eye-fatigue and improve eye-health, when worn by a user, has been recently researched.
Disclosure
Technical Problem
Therefore, the present invention provides a plastic lens composition having high physical properties in a refractive index, weight, impact-resistance, light safety, UV transmittance, etc. and also being effective in protecting eyesight.
Accordingly, in the present invention, a plastic lens resin composition includes minute crystalline mineral powder so as to achieve high optical/mechanical properties and an effect of protecting eyesight.
In other words, the present invention provides a plastic lens composition which has high optical/mechanical/physical properties and is effective in protecting eyesight, and a lens prepared by the lens composition.
Technical solution The present invention provides a plastic lens composition including a transparent polymer resin and crystalline mineral powder.
The present invention provides a plastic lens prepared by the composition.
According to an embodiment of the present invention, crystal powder may be used as the crystalline mineral powder. The crystal refers to crystallized quartz.
The crystal powder may be included in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the transparent polymer resin.
The crystal powder includes particles obtained by grinding a crystal. A particle size may range from 10 to lOOOnm. According to an embodiment of the present invention, the particle size of the crystal powder may be within a range of about 30 to lOOOnm. If the particle size is less than 30nm, there is a possibility that crystallinity of a crystal may not occur in the crystal powder. If the particle size is greater than lOOOnm, particles of the crystal powder in a prepared lens may be seen with naked eyes, thereby causing confusion in a visual field and a problem such as light scattering. The plastic lens composition includes a polymer resin for forming plastics. Herein, as the polymer resin, any transparent polymer resin conventionally used for preparing a plastic lens may be used without limitation. The plastic lens prepared by using the composition according to the present invention may have a high refractive index of 1.5 or more.
Hereinafter, the present invention will be described in detail. A plastic lens composition according to the present invention includes a transparent polymer resin for forming plastics and crystalline mineral powder.
First, as the transparent polymer resin for forming plastics, any conventional polymer resin for preparing a lens may be used without limitation.
According to an embodiment of the present invention, as the transparent polymer resin, a polyethyleneglycolbisallylcarbonate polymer currently mainly used as a glasses lens may be used. Also, in order to adjust a refractive index or improve other optical properties, the polyethyleneglycolbisallylcarbonate polymer may be mixed with other polymer resin component (s) .
According to another embodiment of the present invention, as the transparent polymer resin, polystyrene, polyethyleneglycolbisarylcarbonate, polycarbonate, modified diary phthalate, or a mixture thereof may also be used.
According to another embodiment of the present invention, as a urethane resin, a thiourethane resin may be used. The mixture of the above polymers and resins can also be used. There are some conventionally known methods using resins: a method of using diacrylate or dimethacrylate deprived from bisphenol-A; a method of using diacrylate or dimethacrylate deprived from halogenated bisphenol-A, a method of using a combination of a halogenated styrene monomer and multifunctional methacrylate; or a method of using a diallylphthalate monomer.
The transparent polymer resin may be appropriately selected and used according to demands of a person skilled in the art. As required, at least two kinds of the polymer resins may be used in combination. In this case, the mixing ratio of the transparent polymer resin may vary according to the use of a lens, a required optical property, etc. The content ratio of the transparent polymer resin may vary according to the content of crystalline mineral powder. According to an embodiment of the present invention, the polymer resin may be included in an amount of 85 to 99.9 wt% based on the total weight of the plastic lens composition.
The plastic lens composition according to the present invention includes crystalline mineral powder in addition to the polymer resin for forming plastics. According to an embodiment of the present invention, as the crystalline mineral powder, crystal powder may be used.
A crystal generally denotes quartz or crystal quartz, and it can be said that the crystal is a crystalloid of silicon dioxide (SiO2) . A crystal is crystalline mineral having a Mohs scale hardness of 7.
Conventionally, a colorless transparent crystal has been used as a glasses lens. When a crystal is used as a glasses lens through polishing, it is possible to achieve scratch resistance and high light-transmittance .
However, when a raw crystal is used as a lens, the use is inconvenient due to its weight. Also, in the case of a grinding method mainly employed for processing a crystalline crystal, it is not easy to process the crystal into various kinds of lenses applicable to wide range diopters or various ametropias (such as astigmatism, etc. ) .
Accordingly, in the present invention, in preparing a lens, a crystal in a powder state is mixed with a transparent polymer resin for a plastic lens. In this case, since the polymer resin is in a composition state during the process of processing a lens, it is easy to process various shaped lenses applicable to various uses. Also, the lens according to the present invention has an advantage in that it is lightweight in spite of inclusion of a crystalline mineral component, for example, a crystal component. Also, due to the inclusion of crystalline mineral powder, for example, crystal powder, the plastic lens according to the present invention can have high light- transmittance and an increased refractive index. In addition, in the lens, medical properties of a crystal may be revealed.
A crystal is generally colorless-transparent or white-semitransparent, and under certain circumstances, may be yellow (citrin) , red or pink (rose quartz), green, blue (blue quartz) , violet (amethyst) , dark brown (smoky quartz), etc. According to the present invention, it is possible to use any kind of crystal may be used without limitation on crystal color.
Accordingly, the crystal powder according to the present invention may be obtained by grinding at least one crystal selected from the group including a colorless transparent crystal, a white semitransparent crystal, a yellow crystal (citrin) , a red crystal (rose quartz), a green crystal, a blue crystal (blue quartz), a violet crystal (amethyst) and a dark brown crystal (smoky quartz) .
Meanwhile, violet color of a crystal is caused by
Fe2U3 and is changed to yellow by heating at 230~260°C. This yellow crystal is called topaz or yellow quartz. Thus, according to an embodiment of the present invention, topaz may be used as a crystal.
Needless to say, a synthetic crystal industrially synthesized may also be applied to the present invention . There is also commercially available crystal powder which may be used as required.
In gemology, since a term of quartz is more frequently used than a term of crystal, quartz may also be included in the crystal according to the present invention.
Meanwhile, a crystal has a natural frequency. A crystal has been conventionally used for a clock, which is based on the fact that when electricity is applied to a thin crystal layer, vibration automatically occurs. In general, a crystal layer used for a clock upwardly/downwardly vibrates 32,768 times per 1 second. Herein, time may be calculated by moving a second hand by 1 second or adding a number corresponding to 1 second, by using a toothed wheel, etc. while such a crystal layer vibrates 32,768 times.
In the case of a lens including a crystal, such minute vibration of a crystal generates a wavelength with a low frequency, and thus the wavelength with a low frequency is provided to eyes of a user wearing glasses obtained using by the lens.
The crystal powder may be used in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the polymer resin. If the content of the crystal powder is too low, there is a possibility that crystal characteristics do not occur in a lens. If the content of the crystal powder is too high, there is a possibility that a lens becomes heavy and polymerization of a lens composition is subject to negative effects. The crystal powder is obtained by grinding a crystal. A particle of the crystal powder may have a size of 10 to lOOOnm, and preferably of 30 to lOOOnm considering crystallinity and optical properties. The plastic lens composition according to the present invention may further include an additive required for convenience in performance improvement, betterment, or preparation of a lens. There is no limitation in the kind of such an additive.
The additive may include a cross-linking agent, a colorant, an anti light scattering agent, an antistatic agent, etc. but the present invention is not limited thereto . According to an embodiment of the present invention, such an additive may be included in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the polymer resin.
The present invention also provides a plastic lens prepared by the plastic lens composition according to the present invention.
The plastic lens according to the present invention may be prepared by a conventional method of preparing a lens by using a plastic lens composition. For example, respective components of the plastic lens composition according to the present invention may be mixed and then formed into a lens.
According to an embodiment of the present invention, a lens may be obtained by the steps of: melting a transparent polymer resin; adding crystalline mineral powder and an additive (as required) to the molten resin; and molding the molten mixture through a mold.
According to an embodiment of the present invention, a plastic lens may be obtained by the steps of: firstly dispersing crystalline mineral in a solvent, for example, acetone; mixing the dispersed mineral with a transparent polymer resin in a monomer state; and carrying out polymerization.
According to another embodiment of the present invention, a lens may be obtained by the steps of: mixing a transparent polymer resin with crystalline mineral powder, for example, crystal powder; melting the mixture while adding an additive as required; and molding the molten mixture through a mold.
Herein, the molten mixture may be preliminarily polymerized into a syrup-state mixture and then the syrup-state mixture may be molded through the mold.
Advantageous Effects
The lens composition according to the present invention includes crystalline mineral powder in addition to a composition for a plastic lens, and thus may be prepared into a plastic lens capable of showing optical/physical/medical properties of the crystalline mineral .
Best Mode
Mode for Invention
Reference will now be made in detail to the preferred embodiments of the present invention. However, the following examples are illustrative only, and the scope of the present invention is not limited thereto.
Example 1 30Og of polyethyleneglycolbisallylcarbonate polymer (PPG Industries Co., trade name: CR-39) was fed into a vessel and was melted by heating at 40~50°C.
2Og of crystal powder having an average particle diameter of 30nm (Nano-Techworld (Korea) ; Nano Crystal Powder) was dispersed in 100ml of acetone, and was mixed with the molten polyethyleneglycolbisallylcarbonate polymer. Then, to the mixture, as a cross-linking agent, 9g of isopropyl peroxycarbonate was fed and mixed.
The mixture was molded into a lens through a lens forming glass mold with a diameter of 65mm. Then, the lens taken from the mold was washed and dried.
Examples 2 and 3
A plastic lens was prepared in the same manner as described in Example 1, except that polystyrene (Example 2) and polycarbonate (Example 3) were used instead of polyethyleneglycolbisalIyIcarbonate polymer.
Experimental Example 1 Test on physical properties On the plastic lenses obtained from the above Examples, tests of a refractive index, visible ray transmittance, and impact resistance were carried out in the following manner. Table 1 shows the result.
1. Test on a refractive index
A refractive index was measured by a refractometer .
2. Test on visible ray transmittance
Visible ray transmittance was measured by an optical tester.
3. Test on impact resistance
Impact resistance was tested by dropping a ball of 16.3g from the height of 127cm to a lens sample with a center thickness of 2mm in accordance with an FDA standard. As a result, a damaged lens was determined as Λpoor' , and an undamaged lens was determined as Λgood' .
[Table 1]
Figure imgf000014_0001
As noted in Table 1, it can be seen that the lenses obtained from the Examples have high physical properties in a refractive index and UV transmittance.
Industrial Applicability
The lens composition according to the present invention may be used for preparing a plastic lens.
Although several exemplary embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

Claims
1. A composition for a plastic lens, the composition comprising a transparent polymer resin and crystalline mineral powder.
2. The composition as claimed in claim 1, wherein the crystalline mineral powder is crystal powder.
3. The composition as claimed in claim 2, wherein the crystal powder is included in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the transparent polymer resin.
4. The composition as claimed in claim 2, wherein the crystal powder has a particle size ranging from 30 to lOOOnm.
5. The composition as claimed in claim 2, wherein the crystal powder is obtained by grinding at least one crystal selected from the group consisting of a colorless transparent crystal, a white semitransparent crystal, a yellow crystal (citrin), a red crystal (rose quartz), a green crystal, a blue crystal (blue quartz), a violet crystal (amethyst) and a dark brown crystal (smoky quartz) .
6. The composition as claimed in claim 1, wherein the transparent polymer resin is least one selected from the group consisting of a polyethyleneglycolbisalIyIcarbonate polymer, polystyrene, polyethyleneglycolbisarylcarbonate, polycarbonate, modified diarylphthalate, and a thiourethane resin.
7. The composition as claimed in claim 1, further comprising at least one material selected from the group consisting of a cross-linking agent, a colorant, an anti light scattering agent, and an antistatic agent, as an additive.
8. A plastic lens prepared by the composition as claimed in any one of claims 1 to 7.
PCT/KR2008/005401 2007-09-14 2008-09-12 A composition for plastic lens comprising crystalline mineral powder and a plastic lens prepared using the composition WO2009035286A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0093620 2007-09-14
KR20070093620 2007-09-14

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5475074A (en) * 1993-01-29 1995-12-12 Tokuyama Corporation Polymerizable composition, organic glass and ophthalmic lens
US6743886B2 (en) * 2000-03-15 2004-06-01 Hoya Corporation Plastic lenses for spectacles
US6780965B2 (en) * 2000-07-11 2004-08-24 Teijin Chemicals Ltd Plastic lens
US7101953B2 (en) * 2002-03-28 2006-09-05 Hoya Corporation Process for producing plastic lens and plastic lens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5475074A (en) * 1993-01-29 1995-12-12 Tokuyama Corporation Polymerizable composition, organic glass and ophthalmic lens
US6743886B2 (en) * 2000-03-15 2004-06-01 Hoya Corporation Plastic lenses for spectacles
US6780965B2 (en) * 2000-07-11 2004-08-24 Teijin Chemicals Ltd Plastic lens
US7101953B2 (en) * 2002-03-28 2006-09-05 Hoya Corporation Process for producing plastic lens and plastic lens

Also Published As

Publication number Publication date
KR20100084513A (en) 2010-07-26
WO2009035286A3 (en) 2009-05-22

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