JP2008088353A - Transparent polymer composition and optical member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transparent polymer composition having excellent optical properties, especially excellent transparency and high refractive index and to provide an optical member. <P>SOLUTION: The transparent polymer composition comprises photocatalytically active inorganic microparticles (A) and a transparent polymer (B) and is capable of being controlled in the refractive index by irradiation with ultraviolet rays. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a surface-modified inorganic fine particle that is excellent in dispersibility with respect to a transparent polymer composition (transparent resin composition) used for an optical member and the like, and can increase the refractive index while ensuring its transparency and optical characteristics. And a transparent polymer composition capable of adjusting the refractive index by irradiating it with ultraviolet rays.

  Conventionally, the refractive index of transparent polymers has been increased by introducing sulfur, halogen atoms or benzene rings into the side chains and main skeleton of the polymer. However, the refractive index of the transparent polymer has a limit of about 1.8 at the maximum, and optical characteristics such as moisture absorption, refractive index temperature dependency, and birefringence may be deteriorated. In recent years, attempts to disperse fine particles in a composition together with a transparent polymer have been actively conducted as a technique capable of increasing the refractive index while imparting various optical characteristics.

  However, when the refractive index is increased by dispersing fine particles having a high refractive index in a transparent polymer having a lower refractive index than that, it is necessary to give sufficient consideration to the particle size and dispersibility of the fine particles. In general, it is expected that excellent transparency is realized only when fine particles sufficiently smaller than the wavelength of light are dispersed completely independently.

  However, in practice, when fine particles having a particle size sufficiently smaller than the wavelength of light, particularly fine particles having a particle size of 100 nm or less, are dispersed in the transparent polymer composition, the fine particles easily aggregate and the composition becomes transparent. Sex declines. In addition, with regard to fine particles of metal oxides such as titanium, which are expected to have a high refractive index, the cohesive force is large, so that this is highly filled and dispersed while maintaining transparency that satisfies the requirements of optical applications. Has been difficult in the past, but by the technique disclosed in Patent Document 1, high filling and dispersion in various resins is becoming possible.

  According to the above technique, the inorganic fine particles whose surface is modified with both a modified molecule having a low molecular weight and a modified polymer having a high molecular weight are excellent in the transparent polymer composition without agglomeration even when highly filled. It was found that a transparent polymer composition exhibiting dispersibility and having high transparency and refractive index can be obtained.

By the way, when the inorganic fine particles are mixed in the transparent polymer composition at a certain blending amount, the refractive index is determined at that time, and thereafter, it is difficult to change the refractive index. For this reason, in order to construct a multilayer structure having two or more layers having different refractive indexes, such as an antireflection film, and an inclined structure having different refractive index distributions in the central portion and the peripheral portion, such as an optical fiber, multiple coatings are required. A film process was required.
Japanese Patent Application No. 2006-001366

  In view of the above, an object of the present invention is to provide a transparent polymer composition and an optical member having excellent optical properties, in particular, excellent transparency and a high refractive index.

  The present researchers have shown that a transparent polymer composition having excellent transparency and refractive index, in which the surface-modified inorganic fine particles exhibit excellent dispersibility without agglomeration even when filled in the transparent polymer composition. In addition, it is found that the use of inorganic fine particles having photocatalytic activity reduces the refractive index of the transparent polymer composition containing the fine particles by ultraviolet irradiation, thereby completing the present invention. It came to.

That is, the present invention relates to the following.
1. A transparent polymer composition comprising inorganic fine particles (A) having photocatalytic activity and a transparent polymer (B), the refractive index of which can be controlled by irradiation with ultraviolet rays.
2. Item 2. The transparent polymer composition according to Item 1, wherein the inorganic fine particles (A) are an oxide containing titanium.
3. Item 3. The transparent polymer composition according to Item 1 or 2, wherein the inorganic fine particles (A) have an average particle size of 1 to 50 nm.
4). Item 1. The surface of the inorganic fine particles (A) is modified with both a modified molecule (a) having a molecular weight of less than 1000 and a modified polymer (b) having a weight average molecular weight of 1000 or more The transparent polymer composition according to any one of the above.
5. The ratio of the modified molecule (a) having a molecular weight of less than 1000 and the modified polymer (b) having a weight average molecular weight of 1000 or more that modifies the surface of the inorganic fine particles (A) is 1000: 1 to 1 in molar ratio. Item 5. The transparent polymer composition according to Item 4, which is 1: 10000.
6). Item 6. The transparent polymer composition according to Item 4 or 5, wherein the modified polymer (b) having a weight average molecular weight of 1000 or more is a polymer that is compatible with the transparent polymer (B).
7). Item 7. The transparent polymer composition according to any one of Items 1 to 6, wherein the content of the inorganic fine particles (A) is 0.1 to 95% by weight.
8). Item 8. The transparent polymer composition according to any one of Items 1 to 7, wherein the haze when a thin film having a thickness of 100 to 1000 nm is 1.0% or less as measured by a turbidimeter.
9. Item 9. The transparent polymer composition according to any one of Items 1 to 8, wherein the refractive index at a wavelength of 400 to 800 nm is 1.60 to 2.80 when a thin film having a thickness of 100 to 1000 nm is formed.
10. Item 10. The transparent polymer composition according to any one of Items 1 to 9, wherein the refractive index after ultraviolet irradiation is 0.1 or more smaller than that before irradiation.
11. Item 11. An optical member using the transparent polymer composition according to any one of items 1 to 10.

  In the present invention, the term “transparent” means that light is transmitted to such an extent that it can be used for optical purposes. Specifically, the light transmittance at a wavelength of 400 to 800 nm is 90% or more, and It is desirable that the haze is 1% or less.

  According to the present invention, it is possible to obtain a transparent polymer composition having excellent optical properties, particularly excellent transparency and high refractive index, and further applying inorganic fine particles having photocatalytic activity and excellent dispersibility. Thus, it is possible to provide a transparent polymer composition and an optical member that can be controlled in refractive index by ultraviolet irradiation.

  Further, the transparent polymer composition of the present invention specifically includes a lens for a camera or glasses, a pickup lens for an optical recording / playback device, a hard coating material for a film lens, a liquid crystal display, an EL display, or a CRT display. It can be suitably used as an optical member (an optical material) such as an antireflection layer or a brightness enhancement layer of an EL display. Moreover, since the refractive index control is easy, the transparent polymer composition of this invention is suitable also for the use which was not able to respond with the conventional transparent polymer for optics.

The present invention will be described in detail below.
The inorganic fine particles (A) having photocatalytic activity in the present invention may be oxides or sulfides containing one or more kinds of metals as long as they have photocatalytic activity, but preferably in the ultraviolet region of 200 to 400 nm. There is absorption. Specific examples of the metal contained include titanium, zinc, tin, tungsten, iron, niobium, strontium, barium, and tantalum. Moreover, the photocatalytic activity here is an effect that the oxidation reaction of the organic matter is remarkably accelerated by the catalyst activated by ultraviolet irradiation. Furthermore, it is known that this oxidation reaction occurs vigorously in proportion to the amount of ultraviolet rays to be irradiated, and the organic matter is decomposed and vaporized, or it is oxidized to carbon dioxide or water.

  Of the substances having photocatalytic activity, titanium-containing oxides are more preferable as those having high activity and low cost. More preferably, titanium dioxide can be mentioned. Crystal structures such as anatase, rutile, and brookite are known, but are not particularly limited.

  In addition, as the structure of the inorganic fine particles (A), for example, a structure that forms a crystal structure of one or more metals, or a core in which one inorganic fine particle (A) is coated with one or more other inorganic substances. Examples include a shell structure.

  The particle diameter of the inorganic fine particles (A) is preferably 1 nm or more and 50 nm or less as an average particle diameter. In particular, when the optical path length in the transparent polymer composition is increased, the thickness is preferably 1 nm or more and 20 nm or less in order to achieve higher transparency. In addition, the average particle diameter is a transmission electron microscope (TEM) for at least one hundred particles randomly selected from the inorganic fine particles (A) including shapes such as a spherical shape, a rod shape, and an irregular shape. Then, the area of each particle image is measured, and the diameter of a circle having the same area is used as the particle diameter, and the average particle diameter is calculated by a known statistical process.

  Moreover, in order to prevent the transparency fall by light scattering, it is preferable that the particle | grains with a particle diameter of 50 nm or more are not observed. In particular, in order to realize higher transparency, it is desirable that particles having a particle diameter of 20 nm or more are not observed.

  The transparent polymer composition of the present invention is characterized in that both the inorganic fine particles (A) and the transparent polymer (B) are dispersed in the composition. However, the inorganic fine particles (A) can form a transparent thin film by themselves. The method of forming the thin film is not particularly limited, but the surface is modified with an organic substance, so when dispersed in an organic solvent, a transparent dispersion is obtained, and the thin film has high transparency and a high refractive index by spin casting or the like. Can be formed. On the other hand, when the surface of the inorganic fine particles (A) is modified with both the modifying molecule (a) having a molecular weight of less than 1000 and the modifying polymer (b) having a weight average molecular weight of 1000 or more, the surface of the inorganic fine particles (A) is dispersed in the transparent polymer (B). By making it, the transparent polymer composition which filled the inorganic fine particle (A) more highly can be given.

  The modification with the modifying molecule (a) having a molecular weight of less than 1000 is mainly performed to prevent the irreversible aggregation from being caused by direct contact between the inorganic fine particles (A). If fine particles are dispersed in a transparent polymer composition with high filling, the compatibility with the transparent polymer is limited, resulting in the formation of aggregates in the composition, and the transparency of the composition decreases. End up. Therefore, in the present invention, the modification molecule (a) having a molecular weight of less than 1000 prevents aggregation of the inorganic fine particles (A), and further, the modification polymer (b) having a weight average molecular weight of 1000 or more further provides the inorganic fine particles ( The compatibility between A) and the transparent polymer was increased, and a further high filling dispersion of the inorganic fine particles in the transparent polymer composition was realized.

  The modified polymer (b) is preferably a polymer that is compatible with the transparent polymer (B) dispersed together with the inorganic fine particles (A) in the transparent polymer composition of the present invention. In the present invention, “compatible” means that the mixture after mixing by a method of directly mixing or kneading both polymers, a method of once dissolving in a solvent and mixing and distilling off the solvent is excellent. It means having a sex.

  The polymer chain in the modified polymer (b) includes a straight chain type and a branched type, but is not particularly limited. The polymer chain may be formed by polymerizing the same monomer or polymerizing two or more different monomers. However, in order to well disperse the surface-modified inorganic fine particles of the present invention together with the transparent polymer, the modified polymer (b) preferably has a weight average molecular weight of 1,000 to 1,000,000.

  The ratio of the modified molecule (a) having a molecular weight of less than 1000 and the modified polymer (b) having a weight average molecular weight of 1000 or more, which modifies the surface of the inorganic fine particle (A), is determined by the inorganic fine particle (A). Although there is no restriction | limiting in particular as long as it disperse | distributes with a transparent polymer (B), Specifically, modified molecule (a) and modified polymer ((b) shall be 1: 0.1-1: 10000 by molar ratio. When the inorganic fine particles (A) are highly filled and dispersed in the transparent polymer composition, it is desirable that the ratio of the modifying molecule (b) to the modifying molecule (a) is small.

  The transparent polymer (B) in the present invention is generally used as an optical application, and is not particularly limited as long as the molded product or cured product has transparency. Specifically, acrylic resin, phenoxy resin, polystyrene, polycarbonate, polycycloolefin, natural rubber, polyisoprene, poly-1,2-butadiene, polyisobutene, polybutene, poly-2-heptyl-1,3-butadiene, (Di) enes such as poly-2-t-butyl-1,3-butadiene, poly-1,3-butadiene, polyoxyethylene, polyoxypropylene, polyvinyl ethyl ether, polyvinyl hexyl ether, polyvinyl butyl ether, and other poly Examples include ethers, polyesters such as polyvinyl acetate and polyvinyl propionate, polyurethane, ethyl cellulose, polyvinyl chloride, polyacrylonitrile, polymethacrylonitrile, polysulfone, polysulfide, and the like. It can also be used in combination with seeds or more.

  In addition to the above, ethylene vinyl acetate copolymer, ethylene-vinyl acetate copolymer modified product, polyethylene, ethylene-propylene copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene -Acrylate copolymer, acrylate rubber, polyisobutylene, atactic polypropylene, polyvinyl butyral, acrylonitrile-butadiene copolymer, styrene-butadiene block copolymer, styrene-isoprene block copolymer, ethylene cellulose, Synthetic rubbers such as polyamide, silicone rubber and polychloroprene, silicone, polyvinyl ether and the like are applicable, and these can be used alone or in combination of two or more.

  Furthermore, after introducing a functional group into the transparent polymer (B) and compositing with the surface-modified inorganic fine particles of the present invention, a reaction between the functional groups is caused to form a network of the transparent polymer (B). Can be achieved. Alternatively, various reactive polymerizable molecules can be used alone or in combination of two or more together with the inorganic fine particles (A) and the transparent polymer (B). In this case, the reactive polymerizable molecule can be made high molecular weight or networked between the molecules. Thus, as described above, the transparent polymer composition of the present invention comprises the surface-modified inorganic fine particles of the present invention and the transparent polymer (B).

  The transparent polymer composition of the present invention is, for example, a method of mixing a dispersion of the surface-modified inorganic fine particles of the present invention in an arbitrary solvent with a solution of the transparent polymer (B) dissolved in an arbitrary solvent. It can be produced by a melt kneading method or the like. When the transparent polymer (B) is a transparent resin, in addition to the two methods described above, the surface-modified inorganic fine particles of the present invention are dispersed in the monomer solution, and then heated or lighted. A cured product of the transparent resin composition can be produced by polymerizing the monomer. In addition, the form of the transparent polymer composition of the present invention may be liquid (varnish) or solid (cured). Moreover, it can also be made into a thin film shape according to a use.

  The content in the transparent polymer composition containing the surface-modified inorganic fine particles of the present invention is not particularly limited, but is preferably 0.1 to 95% by weight. This content can be accurately measured from the residue obtained by heating and thermally decomposing the transparent polymer composition up to 900 ° C. at a heating rate of 10 to 50 ° C./min.

  In addition, the transparent polymer composition of the present invention preferably has a haze of 1% or less as measured by a turbidimeter when a thin film having a film thickness of 100 to 1000 nm is used, and a thin film having a film thickness of 100 to 1000 nm. The refractive index at a wavelength of 400 to 800 nm is preferably 1.60 to 2.80. In addition, the measuring method of these physical properties is explained in full detail in a following example.

  When the transparent polymer composition of the present invention is irradiated with ultraviolet rays having a wavelength of 400 to 800 nm, the refractive index of the irradiated portion is lowered. This is because the oxidation reaction of the polymer in the peripheral part of the inorganic fine particles (A) having photocatalytic activity is promoted, and voids are generated by decomposition or vaporization, resulting in a decrease in refractive index. Although there is no restriction | limiting in the ultraviolet-ray to irradiate, What is necessary is just to generate | occur | produce ultraviolet rays, such as a high pressure mercury lamp and a low pressure mercury lamp which are generally marketed.

  However, if the range to be irradiated and the range not to be irradiated are distinguished using a mask or the like, it is possible to form a two-layer structure or pattern having this refractive index. In addition, by adjusting the irradiation intensity, the amount of irradiated ultraviolet light in the transparent polymer composition can be controlled, and the refractive index can be inclined in the composition. This is because the amount of decrease in the refractive index is increased in proportion to the amount of the ultraviolet rays irradiated more. In this way, it is possible to design a gradient index material.

  The refractive index adjustment by these ultraviolet rays is possible for the first time because the transparent polymer composition has high transparency. At this time, no increase in haze or decrease in transmittance occurs. This is because voids are formed only in the peripheral portion of the inorganic fine particles (A), and thus phenomena such as particle aggregation and resin opacification do not occur.

EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not restrict | limited to the following Example.
<Example 1>
(Synthesis example of titanium oxide fine particles)
In a 100 ml three-necked flask equipped with a thermometer and a reflux condenser, 5.0 g of trioctylphosphine oxide (manufactured by Aldrich, molecular weight = 386.63), 0.76 g of titanium tetrachloride (manufactured by Wako Pure Chemical Industries), normal heptadecane 30 0.0 g (manufactured by Wako Pure Chemical Industries, Ltd.) was added and heated to 280 degrees Celsius with stirring under a nitrogen atmosphere. After reaching 280 ° C., 1.14 g of tetraisopropoxy titanium (manufactured by Wako Pure Chemical Industries, Ltd.) was added while maintaining this temperature. The mixture was stirred as it was for 5 minutes and then allowed to cool, whereby a precipitate was deposited. The supernatant was removed by inclining, and the precipitate was washed with 2-propanol and acetone in this order to obtain 0.33 g of titanium oxide fine particles (average particle size: 14 nm) modified with a modifying molecule having a molecular weight of less than 1000 as a precipitate.

(Modified polymer synthesis example 1)
To a 100 ml three-necked flask equipped with a thermometer and a reflux condenser was added 3.34 g of 4,4′-azobis (4-cyanovaleric acid) (manufactured by Wako Pure Chemical Industries) and 10 ml of thionyl chloride (manufactured by Wako Pure Chemical Industries). The mixture was refluxed for 30 minutes under a nitrogen atmosphere. When 80 ml of hexane cooled to 0 ° C. was added after refluxing, a precipitate was deposited. The supernatant was removed by inclining, and 80 ml of hexane cooled again to 0 ° C. was added to the precipitate and shaken vigorously. The precipitate was filtered and dried under reduced pressure to obtain 2.71 g of product (I) (the following chemical formula (I)). Further, 0.18 g of the product (I) obtained above, 30 ml of THF and 6.0 g of methyl methacrylate (manufactured by Wako Pure Chemical Industries, Ltd.) were added to a 100 ml three-necked flask, and dissolved oxygen was removed by argon bubbling. After stirring for 5 hours at 70 ° C. in an argon atmosphere while stirring, the polymer is allowed to cool and modified with terminal functional polymethyl methacrylate (hereinafter, PMMA) modified polymer (II) (the following general formula (II), weight average molecular weight 36600) A tetrahydrofuran solution was obtained.

(Example 1 of modifying fine particles with a modified polymer)
1. A dispersion obtained by dispersing 0.20 g of titanium oxide fine particles obtained in the above-mentioned titanium oxide fine particle synthesis example in 5.0 ml of tetrahydrofuran, and a tetrahydrofuran solution of the terminal ability PMMA-modified polymer obtained in the modified polymer synthesis example 1. 0 ml was added to a 30 ml two-necked flask equipped with a reflux condenser and heated under a nitrogen atmosphere to reflux for 8 hours. Then, it stood to cool and returned to room temperature, and when the content was dripped in 20 ml of methanol, precipitation produced | generated. This precipitate was separated by filtration to obtain 0.18 g of a solid of PMMA-modified titanium oxide fine particles.

(Transparent polymer composition preparation example 1)
A dispersion obtained by dispersing 0.18 g of the PMMA-modified titanium oxide fine particles obtained in the above treatment example 1 in 1.0 ml of toluene and 0.100 g of PMMA (Mitsubishi Rayon, molecular weight = 40000, refractive index 1.49) are added to toluene 5. A PMMA toluene solution dissolved in 0 ml was mixed and spin-coated on a slide glass and a silicon wafer to prepare a transparent polymer composition having a thickness of 300 nm to 800 nm.

<Comparative Example 1>
(Synthesis example of modified zirconium oxide fine particles)
In a 100 ml three-necked flask equipped with a thermometer and a reflux condenser, 20.0 g of trioctylphosphine oxide (manufactured by Aldrich, molecular weight = 386.63), 1.16 g of zirconium tetrachloride (manufactured by Aldrich), 1.56 g of tetraisopropoxyzirconium (Aldrich) was added and heated to 340 degrees Celsius with stirring under a nitrogen atmosphere. After reaching 340 ° C., the mixture was stirred as it was for 2 hours and then allowed to cool to room temperature. Subsequently, 50 ml of acetone was added, and a precipitate was formed. The supernatant was removed by inclining, and the precipitate was washed with acetone to obtain 0.54 g of zirconium oxide fine particles (average particle size 4 nm) modified with a modifying molecule having a molecular weight of less than 1000 as a precipitate.

(Example 2 of modifying fine particles with a modified polymer)
A dispersion obtained by dispersing 0.54 g of the modified zirconium oxide nanoparticles obtained in the above-mentioned zirconium oxide fine particle synthesis example in 5.0 ml of tetrahydrofuran, and a tetrahydrofuran solution 1 of the terminal ability PMMA-modified polymer obtained in the modified polymer synthesis example 1 0.0 ml was added to a 30 ml two-necked flask equipped with a reflux condenser and heated under a nitrogen atmosphere to reflux for 8 hours. Then, it stood to cool and returned to room temperature, and when the content was dripped in 20 ml of methanol, precipitation produced | generated. This precipitate was separated by filtration to obtain 0.50 g of PMMA-modified zirconium oxide fine particles as a solid.

(Transparent polymer composition preparation example 2)
A dispersion obtained by dispersing 0.20 g of the PMMA-modified zirconium oxide fine particles obtained in the above treatment example 2 in 1.0 ml of toluene and 0.100 g of PMMA (Mitsubishi Rayon, molecular weight = 40000, refractive index 1.49) are added to toluene 5. A PMMA toluene solution dissolved in 0 ml was mixed and spin-coated on a slide glass and a silicon wafer to prepare a transparent polymer composition having a thickness of 300 nm to 800 nm.

<Evaluation>
(1) Ultraviolet irradiation Ultraviolet irradiation was performed under the condition that the intensity at the surface at 365 nm was 5000 mW / cm ² using SP-7-250UB manufactured by USHIO INC.
(2) Refractive index and transmittance About each transparent composition thin film produced in Example 1 and Comparative Example 1, the refractive index and the light transmittance at 400 nm to 800 nm were examined by an ultraviolet-visible near-infrared spectrometer manufactured by JASCO Corporation. . The calculation method of the refractive index was based on the method for obtaining the refractive index and film thickness of the transparent film in the literature (University of Tokyo Press, Thin Film / Optical Device, Sadafumi Yoshida, Hiroyoshi Yajima). The results are shown in FIG.

(3) Haze About each transparent polymer composition thin film produced in Example 1 and Comparative Example 1, each haze was investigated by Nippon Denshoku Industries haze meter NDH2000. The results are shown in Table 1 below.
(Circle): Haze 1% or less x: Haze 1% or more (4) Transmittance About each transparent polymer composition thin film produced in Example 1 and Comparative Example 1, 400 nm to 800 nm using an ultraviolet-visible near-infrared spectrometer manufactured by JASCO Corporation. The transmittance of light was investigated. The transmittance of the slide glass is 91%. The results are shown in Table 1 below.
○: Transmittance is 90% or more X: Transmittance is less than 90% (5) For each of the prepared transparent composition thin films, the weight ratio of the inorganic substance in the transparent polymer composition is TG / DTA6300 manufactured by SSI Nanotechnology. It was measured. The results are shown in Table 1 below.

(6) Particle Observation About the titanium oxide fine particles and zirconium oxide fine particles synthesized in Example 1 and Comparative Example 1, the shape and size of the particles were measured with an H-9000NAR transmission electron microscope (TEM) manufactured by Hitachi. The results are shown in FIG. In the TEM photograph of FIG. 2, the left side is titanium oxide and the right side is zirconium oxide.

  From the evaluation results, it is possible to obtain a transparent polymer composition having excellent optical properties, particularly excellent transparency and high refractive index, and further by applying inorganic fine particles having excellent dispersibility having photocatalytic activity, It has been found that it is possible to provide a transparent polymer composition and an optical member capable of controlling the refractive index by ultraviolet irradiation.

It is a graph which shows the relationship between irradiation time and a refractive index change. It is a TEM photograph of the synthesized titanium oxide fine particles and zirconium oxide fine particles (left: titanium oxide, right: zirconium oxide).

Claims (11)

  A transparent polymer composition comprising inorganic fine particles (A) having photocatalytic activity and a transparent polymer (B), the refractive index of which can be controlled by irradiation with ultraviolet rays.   The transparent polymer composition according to claim 1, wherein the inorganic fine particles (A) are an oxide containing titanium.   The transparent polymer composition according to claim 1 or 2, wherein the inorganic fine particles (A) have an average particle diameter of 1 to 50 nm.   The surface of the inorganic fine particle (A) is modified with both a modified molecule (a) having a molecular weight of less than 1000 and a modified polymer (b) having a weight average molecular weight of 1000 or more. 4. The transparent polymer composition according to any one of 3.   The ratio of the modified molecule (a) having a molecular weight of less than 1000 and the modified polymer (b) having a weight average molecular weight of 1000 or more that modifies the surface of the inorganic fine particles (A) is 1000: 1 to 1 in molar ratio. It is 1: 10000, The transparent polymer composition of Claim 4 characterized by the above-mentioned.   The transparent polymer composition according to claim 4 or 5, wherein the modified polymer (b) having a weight average molecular weight of 1000 or more is a polymer that is compatible with the transparent polymer (B).   The transparent polymer composition according to any one of claims 1 to 6, wherein the content of the inorganic fine particles (A) is 0.1 to 95% by weight.   The transparent polymer composition according to any one of claims 1 to 7, wherein the haze when a thin film having a film thickness of 100 to 1000 nm is 1.0% or less as measured by a turbidimeter.   The transparent polymer composition according to any one of claims 1 to 8, wherein a refractive index at a wavelength of 400 to 800 nm is 1.60 to 2.80 when a thin film having a thickness of 100 to 1000 nm is formed. .   The transparent polymer composition according to any one of claims 1 to 9, wherein a refractive index after ultraviolet irradiation is 0.1 or more smaller than that before irradiation.   An optical member comprising the transparent polymer composition according to claim 1.

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