JP2011202067A - Nanocomposite material, optical lens or window material having nanocomposite material, and method of manufacturing nanocomposite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical lens and a window material consisting of a nanocomposite material containing inorganic particles and organic polymer resin, wherein the refractive index variation to a temperature change is decreased and high optical transparency is maintained.SOLUTION: In the nanocomposite material composing the optical lens, the inorganic particles whose average primary particle diameter is 40 nm or less are dispersed in a resin obtained by polymerizing a polymerization monomer consisting mainly of bisphenol A acrylate or bisphenol A methacrylate whose molecular weight is 400 to 1,000.

Description

  The present invention relates to an optical lens or window material provided with a nanocomposite material of light-transmitting inorganic compound particles and an organic material and a method for producing the nanocomposite material and the nanocomposite material.

  In recent years, the development of nanocomposite materials having both the performance of resin lenses and glass lenses has been attracting attention in optical lenses. Nanocomposite materials are expected to be used as inexpensive lenses and window materials instead of glass.

  The nanocomposite material is an organic-inorganic composite material in which inorganic particles are dispersed in a polymer resin obtained by polymerizing an organic compound.

  Nanocomposite materials are known as optical materials having optical performance comparable to glass and flexible and easy workability. For example, an optical lens using a nanocomposite material prevents the light incident on the optical lens from colliding with the particle by making the average particle diameter of the inorganic particles present in the nanocomposite material smaller than the wavelength of the light. . As a result, light can be transmitted through the nanocomposite material.

  As such an optical lens, Patent Document 1 describes an organic-inorganic composite material in which inorganic fine particles having an Abbe number of 80 or more and a particle diameter of less than 400 nm are combined with an organic polymer material.

  Patent Document 2 describes a lens substrate made of an organic-inorganic composite composition obtained by combining an organic material made of an acrylamide derivative having a molecular weight of 2000 or less and inorganic fine particles having a particle diameter of 10 nm to 15 nm.

Japanese Patent Laid-Open No. 2004-20912 JP 2009-29937 A

  However, the inorganic particles used in Patent Document 1 and the inorganic fine particles used in Patent Document 2 tend to aggregate. This is because inorganic particles generally having an average particle diameter of 400 nm or less tend to aggregate. When the inorganic particles are aggregated, the diameter of the aggregated particles existing in the organic-inorganic composite material (hereinafter referred to as an average secondary particle diameter) is 400 nm or more. As a result, the ability of light to pass through the optical lens (hereinafter referred to as light transmission performance) is lowered.

  Further, even if the concentration of the inorganic fine particles is lowered to prevent aggregation, it is difficult to control the refractive index.

  Therefore, an object of the present invention is to realize a nanocomposite material having high light transmission performance.

The nanocomposite material of the present invention comprises a polymerization initiator, a polymer resin obtained by polymerizing a polymerizable monomer containing bisphenol A acrylate or bisphenol A methacrylate having a molecular weight of 400 or more and 1000 or less by a polymerization initiator, and dispersed in the polymer resin. Inorganic particles having an average primary particle size of 40 nm or less,
It is characterized by comprising.

  With this configuration, since the inorganic particles are uniformly dispersed in the polymer resin obtained by polymerizing the polymerization monomer, aggregation of the inorganic particles is suppressed. As a result, light scattering is reduced, and an optical lens and window material that maintains high light transmission performance can be realized.

The figure which shows the molecular formula of the monomer in Embodiment 1 of this invention The figure which shows the structure and nanocomposite material of the optical lens in Embodiment 1 of this invention (A) The figure which showed the change of the refractive index with the temperature of the optical lens in Embodiment 1 of this invention compared with the prior art, (b) The refractive index change amount of the optical lens in Embodiment 1 of this invention is shown. Figure shown in comparison with the conventional example The figure which shows the relationship between the light transmittance of the diffraction lens in Embodiment 2 of this invention, and the molecular weight of a monomer The figure which shows the structure of the diffraction lens in Embodiment 2 of this invention The figure which shows the relationship between the light transmittance of the diffraction lens in Embodiment 2 of this invention, and the molecular weight of a monomer The figure which shows the manufacturing method of the diffraction lens in Embodiment 2 of this invention.

  The optical lens 3 and the diffractive lens 11 provided with the nanocomposite material in the present invention will be described in detail in the following embodiments.

<Embodiment 1>
1. Optical Lens FIG. 2 is a cross-sectional view of the optical lens 3 according to the first embodiment. As shown in FIG. 2, the optical lens 3 includes a nanocomposite material 30. The nanocomposite material 30 in the first embodiment of the present invention will be described with reference to the drawings.

  The nanocomposite material 30 includes a resin (hereinafter referred to as a polymer resin) in which a polymerizable monomer (hereinafter referred to as a monomer) containing bisphenol A acrylate or bisphenol A methacrylate is polymerized, and average primary particles dispersed in the polymer resin. It comprises inorganic particles having a diameter of 40 nm or less.

  Each compound constituting the nanocomposite material 30 will be described in detail below.

1-1. Polymer Resin The polymer resin 2 constituting the nanocomposite material 30 in the first embodiment of the present invention will be described.

FIG. 1 shows the molecular formula of the monomer that is one constituent unit of the polymer resin 2. The monomer of the polymer resin 2 used in Embodiment 1 is bisphenol A acrylate composed of bisphenol having two benzene rings and an acrylic group, as shown in FIG.
This bisphenol A acrylate is polymerized to produce a polymer resin 2.

  The monomer may be bisphenol A methacrylate obtained by replacing the acrylic group of bisphenol A acrylate with a methacryl group.

  In the nanocomposite material 30 in the first embodiment, the molecular weight of the monomer is 400 or more and 1000 or less. In this case, in the bisphenol A acrylate shown in FIG. 1, the number of functional groups (m + n) of the ethoxy chain bonded to the acrylic group corresponds to 2 or more and 15 or less.

  When the volume of the nanocomposite material 30 is 100 as a volume percentage, bisphenol A acrylate or bisphenol A methacrylate satisfies 70 vol% or more and 95 vol% or less.

1-2, Inorganic Particle Next, the inorganic particle 1 will be described.

The nanocomposite material 30 in Embodiment 1 includes, as the inorganic particles 1, zirconium oxide (ZrO ₂ ), silicon dioxide (SiO ₂ ), zinc oxide (ZnO), titanium oxide (TiO ₂ ), barium titanate (BaTiO ₃ ), Yttrium oxide (Y ₂ O ₃ ), calcium fluoride (CaF ₂ ), magnesium fluoride (MgF ₂ ), barium fluoride (BaF ₂ ) and the like can be appropriately selected and used.

  In the nanocomposite material 30 in the first embodiment, the inorganic particles 1 are appropriately selected according to the design specifications of the refractive index and the Abbe number. And it is preferable that the average primary particle diameter of the inorganic particle 1 selected suitably is 40 nm or less. The average primary particle diameter is a value obtained by averaging the particle diameters of the inorganic particles 1 that do not aggregate at all in the nanocomposite material 30.

  In Embodiment 1, the inorganic particle 1 with an average primary particle diameter of 40 nm or less is used. As a result, when the monomer is polymerized and cured, the aggregation of the inorganic particles 1 is suppressed, and the monomers are uniformly dispersed in the polymer resin 2.

  Moreover, in the nanocomposite material 30 in Embodiment 1, the average secondary particle diameter of the dispersed inorganic particles 1 is 400 nm or less.

  The average secondary particle diameter is a value obtained by averaging the particle diameters of the inorganic particle group in which the inorganic particles 1 are aggregated in the nanocomposite material 30.

  By using these inorganic particles 1, it is possible to realize the optical lens 3 and the window material that maintain high transmission performance.

  Further, the concentration of the inorganic particles 1 is preferably 5 vol% or more and 30 vol% or less, where the volume of the nanocomposite material 30 is 100 as a volume percentage. When the concentration of the inorganic particles 1 is 5 vol% or more and 30 vol% or less, the temperature change of the refractive index can be suppressed. On the other hand, when the concentration of the inorganic particles 1 exceeds 30 vol%, the light transmittance of the optical lens 3 becomes 70% or less, which is not suitable for use in the optical lens 3. Furthermore, when the concentration of the inorganic particles 1 is less than 5 vol%, the optical lens 3 is thermally expanded, so that it is not suitable for use with the optical lens 3.

1-3, Polymerization Initiator As the photopolymerization initiator, a radical photopolymerization initiator or a cationic photopolymerization initiator can be used depending on the type of polymerizable monomer to be polymerized and cured.

  In Embodiment 1, bis (η5-2,4-cyclopentadien-1-yl) -bis (2,6-difluoro-3- (1H-pyrrol-1-yl)-is used as a radical photopolymerization initiator. Phenyl) titanium (Ciba IRGACURE 784) was used.

Moreover, one type selected other than the above radical photopolymerization initiator may be used, or two or more types may be appropriately combined. The content of the radical photopolymerization agent is preferably 0.1 wt% or more and 10 wt% or less when the volume occupied by the polymer resin in the nanocomposite material 30 is 100 as a volume percentage. When satisfying this range, the monomer is stably polymerized and cured without deteriorating the properties and reliability of the nanocomposite material 30, thereby forming the resin layer 2.
2. Manufacturing method of optical lens Next, the manufacturing method of the optical lens 3 provided with the nanocomposite material 30 in Embodiment 1 is demonstrated in order of a process.
Into 64 g of a monomer composed of bisphenol A acrylate (bifunctional acrylate ABE-300 manufactured by Shin-Nakamura Chemical Co., Ltd.) having a molecular weight of 468 (m = 1, n = 2 in the molecular formula of FIG. 1), zirconium oxide (ZrO ₂ with an average primary particle size of 10 nm) is added. ) 350 g of an ethanol dispersion containing 10 wt% (35 g) of particles 1 and 1 g of a polymerization initiator (IRGACURE 784 made by Ciba) were mixed. This mixture is made into a slurry of ethanol. Next, the ethanol slurry is heated to a temperature of 50 ° C. Then, it stirs for 30 minutes with a stirrer. Then, the zirconium oxide (ZrO ₂ ) particles 1 are uniformly dispersed in the slurry of ethanol. Next, the ethanol slurry is put in a petri dish-shaped wide-mouth glass container, and ethanol is volatilized by a solvent distillation method while reducing the pressure in a vacuum drying furnace. When ethanol is completely volatilized, 100 g of a mixture of zirconium oxide (ZrO ₂ ) particles 1, a monomer and a polymerization initiator can be obtained.

Next, 100 g of the mixture is poured into a glass mold for the optical lens 3 and irradiated with ultraviolet rays having an intensity of 70 mW / cm ² for 2 minutes. By the ultraviolet irradiation, the monomer in the mixture is polymerized and cured, and the polymer resin 2 is generated. As a result, a nanocomposite material 30 in which zirconium oxide (ZrO ₂ ) particles 1 are dispersed in the polymer resin 2 can be obtained.
This nanocomposite material 30 is further taken out of the glass mold to obtain the optical lens 3 containing 35 wt% of zirconium oxide particles.

The specific gravity of the zirconium oxide (ZrO ₂ ) particles 1 in the optical lens 3 is 5.49, and the specific gravity of the polymer resin is 1.14.

  That is, in terms of volume concentration, the nanocomposite material 30 containing 10 vol% zirconium oxide particles is obtained.

The optical lens 3 in Embodiment 1 uses bisphenol A acrylate having a molecular weight of 400 or more and 1000 or less as a monomer. Therefore, when the monomer is polymerized and cured to produce the polymer resin 2, the polymer resin 2 and the zirconium oxide (ZrO ₂ ) particles 1 are intertwined. Therefore, it is possible to suppress the generation of secondary particles in which zirconium oxide (ZrO ₂ ) particles 1 are aggregated in polymer resin 2 that has been polymerized and cured. As a result, a nanocomposite material 30 that is uniformly dispersed in the polymer resin 2 in which the zirconium oxide (ZrO ₂ ) particles 1 are cured can be obtained.

The uniform dispersion indicates that zirconium oxide (ZrO ₂ ) particles 1 are present in the nanocomposite material 3 without segregation. Furthermore, the refractive index and light transmission performance of the optical lens 3 including the produced nanocomposite material 30 were measured.
3. Refractive Index Next, the refractive index change with respect to the temperature of the optical lens 3 in the first embodiment will be described. The refractive index at each temperature was measured for the optical lens 3 using a refractometer (manufactured by Atago, multi-wavelength Abbe refractometer DR-M4). Each temperature indicates a temperature in the optical lens.

  FIG. 3A shows a change in refractive index with respect to temperature when light having a wavelength of 587.6 nm (d-line) is incident on the optical lens 3 having a thickness a of 1 mm. The thickness a indicates the thickest distance from the light incident surface to the light emitting surface of the optical lens 3.

  FIG. 3B shows the amount of change in refractive index with respect to a lens temperature drop of 1 ° C. The amount of change in refractive index is the value of the slope of the linear regression line of temperature-refractive index obtained by the least square method based on the measurement result of the refractive index in FIG.

  (A) in each figure shows the refractive index of the optical lens 3 provided with the nanocomposite material 30 in the first embodiment.

  On the other hand, (B) in each figure shows the refractive index of an optical lens made only of a polymer resin of bisphenol A acrylate. That is, the optical lens (B) contains no inorganic particles.

As shown in FIG. 3A, the refractive index of the optical lens 3 in the first embodiment was 1.6134 at a temperature of 25 ° C.
On the other hand, the refractive index of the optical lens of (B) was 1.5668.

  Furthermore, even at a temperature other than 25 ° C., the refractive index of the optical lens 3 in Embodiment 1 is larger than the refractive index of the optical lens (B).

That is, it was found that the optical lens 3 made of the nanocomposite material 30 exhibits a high refractive index when the nanocomposite material 30 contains zirconium oxide (ZrO ₂ ) particles 1 having an average primary particle diameter of 10 nm.

  Furthermore, the optical lens 3 of Embodiment 1 has a smaller refractive index change with respect to temperature than the optical lens (B).

  Next, when the amount of change in the refractive index was determined based on the measurement result of the refractive index at each temperature in FIG. 3A, the result shown in FIG. 3B was obtained.

  As shown in FIG. 3B, the optical lens 3 according to Embodiment 1 has a change in refractive index with respect to temperature being suppressed to about ½ as compared with the optical lens shown in FIG.

That is, the optical lens provided with the nanocomposite material 30 in Embodiment 1 can reduce the change in the refractive index due to the temperature change.
4. Light transmission performance Next, the light transmission performance of the optical lens 3 according to the first embodiment will be described.

FIG. 4 shows the relationship between the molecular weight of the monomer and the light transmittance at wavelengths of 400 nm to 700 nm in the optical lens 3 having a thickness of 1 mm made of the nanocomposite material 30 containing 10 vol% zirconium oxide (ZrO ₂ ) particles 1. Yes.

  In addition, the light transmittance of the optical lens 3 was measured using a transmittance meter (manufactured by Shimadzu Corporation, ultraviolet-visible-near infrared spectrophotometer UV-3150).

As shown in FIG. 4, it can be seen that the light transmittance varies greatly depending on the molecular weight of the monomer.
As shown in FIG. 4, the light transmittance is highest when the molecular weight of the monomer is around 500. However, in order to use as the optical lens 3, the light transmittance needs to be 70% or more. Therefore, when the monomer has a molecular weight range of 400 or more and 1000 or less, the light transmittance is 70% or more. In this molecular weight range, aggregation of zirconium oxide (ZrO ₂ ) particles 1 is suppressed. Even if the zirconium oxide (ZrO ₂ ) particles 1 form an inorganic particle group, the maximum secondary particle diameter of the inorganic particle group is 400 nm or less, so that the incident light is zirconium oxide (ZrO ₂ ) particles 1. To prevent scattering.

  In the first embodiment, when the relationship between the average primary particle size and the transmittance is observed, the transmittance is 70% or more when the average primary particle size is 40 nm or less.

  Therefore, the zirconium oxide 1 dispersed in the polymer resin 2 preferably has an average primary particle size of 40 nm or less.

  Thus, the optical lens 3 which maintained the high permeation | transmission performance is producible by making the molecular weight of a monomer into 400-1000, and also making the average primary particle diameter of an inorganic particle into 40 nm or less.

<Embodiment 2>
Embodiment 2 of the present invention will be described with reference to the drawings.
1. Diffractive Lens The second embodiment is a diffractive lens 11 having a two-layer structure in which a resin layer 5 is formed on the surface of a glass lens 4. FIG. 5 shows a schematic diagram of the diffractive lens 11 in Embodiment 2 of the present invention.
That is, the resin layer 5 made of the nanocomposite material 30 in which the inorganic particles 1 are uniformly dispersed inside the polymer resin 2 is formed on the diffraction grating surface of the glass lens 4 having a diffraction grating on the surface. The diffractive lens 11 having such a two-layer structure can cancel out the occurrence of chromatic aberration by using materials having different refractive indexes and different Abbe numbers for each layer.

  Accordingly, since it is not necessary to further provide an aberration correction lens, the number of lenses of the imaging device such as a camera can be reduced, and the imaging device can be reduced in size and manufacturing cost.

  Nanocomposite material 30 was used as resin layer 5 in the second embodiment.

  That is, nanocomposites in which zinc oxide particles (ZnO) 1 having an average primary particle size of 40 nm or less are dispersed as an inorganic particle 1 in a polymer resin 2 in which bisphenol A acrylate or bisphenol A methacrylate having a molecular weight of 400 to 1000 is polymerized. Material 30.

  In the optical lens 30 according to the second embodiment, since the inorganic particles 1 are dispersed in the resin layer 5, thermal expansion of the resin layer 5 is suppressed. Therefore, the refractive index change due to temperature is reduced, and the occurrence of aberration due to temperature change can be prevented.

Moreover, the polymer resin 2 can maintain the light transmittance of the resin layer 5 high because a monomer having a molecular weight of 400 to 1000 is polymerized. Therefore, the diffractive lens 11 having a two-layer structure with good light transmittance can be realized.
2. Manufacturing Method of Diffraction Lens Next, a manufacturing method of the diffractive lens 11 having a two-layer structure according to the second embodiment will be described in the order of steps.

  460 g of an ethanol dispersion containing 10 wt% of zinc oxide particles (ZnO) having an average primary particle diameter of 10 nm with respect to 53 g of a monomer composed of bisphenol A acrylate having a molecular weight of 776 (m = 5, n = 5 in the molecular formula of FIG. 1) 1 g of the polymerization initiator was mixed into the monomer.

  And the slurry of the ethanol containing the mixture of a monomer, the zinc oxide particle (ZnO) 1, and a polymerization initiator was produced.

  Further, the ethanol slurry was heated to a temperature of 50 ° C. and stirred with a stirrer for 30 minutes to uniformly disperse the zinc oxide particles (ZnO) 1 in the ethanol slurry. Next, the ethanol slurry was put in a petri dish-shaped wide-mouth glass container, and ethanol was volatilized by a solvent distillation method while reducing the pressure in a vacuum drying furnace. When ethanol was completely volatilized, 100 g of a mixture of zinc oxide particles (ZnO) 1, a monomer and a polymerization initiator could be obtained.

  Further, a glass lens 4 having a thickness a of 2 mm having a grating height of 10 μm and a grating pitch of 150 μm on the surface of the glass lens 4 as shown in FIG. The refractive index of the glass lens 4 at a wavelength of 587.6 nm was 1.670, and the Abbe number was 55.

Next, 100 g of the mixture was applied to the surface of the glass lens 4 at a thickness of 100 μm, and irradiated with ultraviolet rays having an intensity of 70 mW / cm ² for 2 minutes. At this time, the monomer in the mixture undergoes a polymerization and curing reaction, and a polymer resin 2 is generated. After the polymerization curing reaction, a nanocomposite material 30 containing 46 wt% of zinc oxide particles (ZnO) 1 is produced from 100 g of the mixture.
Then, a diffractive lens 11 having a two-layer structure in which the resin layer 5 is formed on the surface of the glass lens 4 is produced.

The resin layer 5 has a specific gravity of zinc oxide particles (ZnO) 1 of 5.47 and a specific gravity of the polymer resin 2 of 1.13. Therefore, the resin layer 5 becomes the nanocomposite material 30 containing 15 vol% zinc oxide particles (ZnO) 1 in terms of volume concentration.
Further, the refractive index of the resin layer 5 at a wavelength of 587.6 nm is 1.595 and the Abbe number is 24.

  Thus, by combining the glass lens 4 having a high refractive index and a high Abbe number and the resin layer 5 having a low refractive index and a low Abbe number, a high-performance two-layer structure that cancels out chromatic aberration and does not cause color misregistration. The diffractive lens 11 can be produced. In the diffractive lens 11, the difference in refractive index between the glass lens 4 and the resin layer 5 is preferably 0.05 to 0.1, and the Abbe number difference is preferably 20 to 40. In that case, the diffraction lens 11 of Embodiment 2 can reduce the occurrence of chromatic aberration and prevent the occurrence of color misregistration.

  Next, the light transmission performance of the diffractive lens 11 having a two-layer structure according to the second embodiment will be described.

  FIG. 6 shows the molecular weight of the monomer and the light transmittance at wavelengths of 400 nm to 700 nm in the optical lens (thickness 2 mm) of Embodiment 2 made of the nanocomposite material 30 containing 15 vol% zinc oxide particles (ZnO). This shows the relationship. As in the first embodiment, the light transmittance varies greatly depending on the molecular weight of the monomer, and the light transmittance is highest when the molecular weight is around 500.

  In order to use the optical lens as the diffractive lens 11 as in the second embodiment, the light transmittance is required to be at least 90%. Therefore, the range of the molecular weight of the monomer that satisfies the light transmittance of 90% or more is 400 or more and 1000 or less. In this molecular weight range, aggregation of zinc oxide particles (ZnO) 1 is suppressed, and the average secondary particle diameter is 400 nm or less.

  As a result, it is possible to prevent incident light from hitting the zinc oxide particles (ZnO) 1 and being scattered.

  Thus, also in Embodiment 2, the diffraction lens 11 maintaining high transmission performance can be produced by setting the molecular weight of the monomer to 400 or more and 1000 or less.

  The average particle diameter of the zinc oxide particles (ZnO) 1 is preferably 40 nm or less in terms of the average primary particle diameter.

  Further, the volume percentage of the zinc oxide particles (ZnO) 1 is preferably 5 vol% or more and 30 vol% or less.

In the second embodiment, as the zinc oxide particles (ZnO) 1, zinc oxide having a low Abbe number (ν _d = 13) is used, and the resin layer 5 having an Abbe number different from that of the glass lens 4 is formed. However, depending on the refractive index and Abbe number of the glass lens 4, it is necessary to form the resin layer 5 having the optimal refractive index and Abbe number.

In general, since the resin layer 5 has a lower Abbe number than the glass lens 4, the inorganic particles 1 to be used are preferably zinc oxide (ZnO) or titanium oxide (TiO) having a low Abbe number. .
<Features of the embodiment>
Characteristic parts in the above embodiment are listed below. In addition, the invention included in the said embodiment is not limited to the following. In addition, what was described in parentheses after each component is a specific example of each component. Each configuration is not limited to these specific examples.
(1)
The nanocomposite material (30) includes a polymerization initiator and a polymer resin (2) obtained by polymerizing a polymerizable monomer (monomer) containing bisphenol A acrylate or bisphenol A methacrylate having a molecular weight of 400 to 1000 with the polymerization initiator. And inorganic particles (1) having an average primary particle diameter of 40 nm or less dispersed in the polymer resin (2).

Thereby, the inorganic particles (1) are uniformly dispersed in the polymer resin (2) obtained by polymerizing the polymerization monomer (monomer). Therefore, aggregation of inorganic particles (1) is suppressed. As a result, light scattering is reduced, and light including visible light can be transmitted through the optical lens (3) and the window material with high transmittance. As a result, a high-performance optical lens and window material can be realized.
(2)
The nanocomposite material (30) of (1) is characterized by further containing inorganic particles having an average secondary particle diameter of 400 nm or less dispersed in a polymer resin.

Thereby, since the inorganic particle group in which the inorganic particle (1) exceeds 400 nm is not formed in the nanocomposite material (30), visible light can be transmitted with high efficiency.
(3)
In the nanocomposite material (30) of (1), the inorganic particles (1) are composed of silicon dioxide, zinc oxide, titanium oxide, barium titanate, yttrium oxide, zirconium oxide, calcium fluoride, magnesium fluoride, and barium fluoride. At least one or more particles are selected.

Thereby, it becomes possible to appropriately select the inorganic particles (1) according to the design specifications of the refractive index and the Abbe number.
(4)
In the nanocomposite material (30) of (1), the inorganic particles (1) have a volume percentage in the nanocomposite material (30) of 5 vol% or more and 30 vol% or less.

Thereby, the temperature change of a refractive index can be suppressed.
(5)
It is an optical lens (3) provided with the nanocomposite material (30) in any one of (1)-(4), It is characterized by the above-mentioned.

Thereby, an optical lens (3) with high light transmission performance can be realized. In particular, when SiO ₂ is used as the inorganic particles (1), an optical lens (3) with higher light transmission performance can be realized.
Moreover, when ZrO ₂ is used as the inorganic particles (1), an optical lens (3) having a high refractive index can be realized.
Furthermore, when a fluoride such as MgF ₂ is used as the inorganic particles (1), light can be transmitted in a wide range of wavelengths including near infrared rays.
(6)
The nanocomposite material (30) according to any one of (1) to (4) is a diffractive lens (11) formed on the surface of a diffractive glass lens (4).

Thereby, a diffractive lens (11) with high light transmission performance can be realized. In particular, when SiO ₂ is used as the inorganic particles (1), an optical lens with higher light transmission performance can be realized.
When ZrO ₂ is used as the inorganic particles (1), an optical lens having a high refractive index can be realized.
Furthermore, when a fluoride such as MgF ₂ is used as the inorganic particles (1), light can be transmitted in a wide range of wavelengths including near infrared rays.
(7)
(1) It is a window material provided with the nanocomposite material in any one of (4), It is characterized by the above-mentioned.

Thereby, a window material with high light transmission performance is realizable.
(8)
In the diffraction lens (11) of (7), the inorganic particles (1) are zinc oxide or titanium oxide.

Thereby, since a resin layer having a lower Abbe number is formed as compared with a glass lens, a higher-performance diffractive lens can be realized.
(9)
In the method for producing a nanocomposite material (30), a mixture comprising a polymerizable monomer (monomer) containing bisphenol A acrylate or bisphenol A methacrylate, inorganic particles (1) having an average primary particle size of 40 nm or less, and a polymerization initiator. And a reaction step in which a polymerizable monomer (monomer) contained in the mixture is polymerized and cured by irradiation with ultraviolet rays.

Thereby, since inorganic particle (1) disperse | distributes uniformly in polymer resin (2) which the polymerization monomer (monomer) superposed | polymerized, aggregation of inorganic particle (1) is suppressed. As a result, light scattering is reduced, and an optical lens and window material that maintains high light transmission performance can be realized.
(10)
In the method for producing the nanocomposite material (30) according to (9), the preparation step is characterized by preparing an ethanol dispersion liquid in which the inorganic particles (1) are dispersed in the ethanol liquid.

Thereby, the mixture in the preparation step is homogeneously mixed in ethanol.
(11)
The manufacturing method of the diffractive lens (11) is characterized by further comprising an application step of applying a mixture to the surface of the glass lens (4) between the preparation step and the reaction step.

  Thereby, the diffraction lens (11) which consists of a glass lens (4) and a resin layer (5) provided with different materials more efficiently can be manufactured.

  As an optical material that is easy and inexpensive to control and process the refractive index and Abbe number, it can be used as an optical lens or window material for an imaging camera, an optical pickup device, or the like.

DESCRIPTION OF SYMBOLS 1 Inorganic particle 2 Polymer resin 3 Optical lens 4 Glass lens 5 Resin layer 11 Diffraction lens 22 Mold 30 Nanocomposite material 33 Ultraviolet rays

Claims (11)

A polymer resin obtained by polymerizing a polymerization initiator and a polymerizable monomer containing bisphenol A acrylate or bisphenol A methacrylate having a molecular weight of 400 or more and 1000 or less with the polymerization initiator;
Inorganic particles having an average primary particle diameter of 40 nm or less dispersed in the polymer resin;
A nanocomposite material comprising:   The nanocomposite material according to claim 1, further comprising inorganic particles having an average secondary particle diameter of 400 nm or less dispersed in the polymer resin. The inorganic particles are
2. The particles according to claim 1, wherein the particles are selected from at least one selected from silicon dioxide, zinc oxide, titanium oxide, barium titanate, yttrium oxide, zirconium oxide, calcium fluoride, magnesium fluoride, and barium fluoride. The nanocomposite material described. The inorganic particles are
2. The nanocomposite material according to claim 1, wherein a volume percentage in the nanocomposite material is 5 vol% or more and 30 vol% or less.   An optical lens comprising the nanocomposite material according to claim 1.   The said nanocomposite material in any one of Claims 1-4 is formed in the surface of a diffraction glass lens, The diffraction lens characterized by the above-mentioned. The inorganic particles are
The diffractive lens according to claim 6, wherein the diffractive lens is zinc oxide or titanium oxide.   The window material provided with the nanocomposite material in any one of Claims 1-4. A preparation step of preparing a mixture comprising a polymerizable monomer containing bisphenol A acrylate or bisphenol A methacrylate, inorganic particles having an average primary particle size of 40 nm or less, and a polymerization initiator;
A reaction step of polymerizing and curing the polymerizable monomer contained in the mixture by ultraviolet irradiation;
A method for producing a nanocomposite material. The preparation step includes
The method for producing a nanocomposite material according to claim 9, wherein an ethanol dispersion liquid in which the inorganic particles are dispersed in an ethanol liquid is prepared. Between the preparation step and the reaction step,
The manufacturing method of the diffraction lens further provided with the application | coating step which apply | coats the said mixture to the surface of a glass lens.