JP2009298945A - Inorganic powder, organic/inorganic composite composition and method for producing the same, molding, and optical component - Google Patents

Abstract

The present invention provides a method for producing an organic-inorganic composite composition having excellent solubility and high transparency of a thermoplastic resin by a simple method.
An inorganic powder composed of inorganic fine particles having a particle size of 1 to 15 nm adsorbed with at least one of an organic acid or an inorganic acid, and a step of dispersing this in an organic solvent to produce an inorganic particle dispersion. And a method for producing an organic-inorganic composite composition comprising a step of mixing the dispersion with a thermoplastic resin, an organic-inorganic composite composition, a molded body obtained by molding the same, and a lens comprising the organic-inorganic composite composition Optical parts such as substrates.
[Selection figure] None

Description

  The present invention relates to an organic-inorganic composite composition having high transparency and excellent thermoplastic resin solubility, and an inorganic powder for easily producing the same. Furthermore, it is related also with the molded object comprised including the said organic inorganic composite composition, and an optical component. More specifically, lens base materials (for example, spectacle lenses, optical device lenses, optoelectronic lenses, laser lenses, pickup lenses, vehicle camera lenses, portable camera lenses, digital camera lenses, OHP lenses, etc. ) And other optical components.

  In recent years, research on optical materials has been actively conducted, and particularly in the field of lens materials, the development of materials with excellent high refractive properties, transparency, easy moldability, light weight, impact resistance, releasability, etc. It is strongly desired.

  Plastic lenses are lighter and harder to break than inorganic materials such as glass and can be processed into various shapes, so in recent years they are rapidly spreading not only to spectacle lenses but also to optical materials such as portable camera lenses and pickup lenses. .

  Along with this, it has been required to increase the refractive index of the material itself in order to reduce the thickness of the lens. For example, a technique for introducing a sulfur atom into a polymer (see Patent Document 1 and Patent Document 2) In addition, a technique for introducing a halogen atom or an aromatic ring into a polymer (see Patent Document 3), a technique using a copolymer of an indene derivative and a vinyl monomer (see Patent Document 4), and the like have been actively studied. . However, a plastic material that has a sufficiently large refractive index and has good transparency and can be used as a substitute for glass has not yet been developed.

  Since it is difficult to increase the refractive index only with organic substances, attempts have been made to produce a high refractive index material by dispersing an inorganic oxide having a high refractive index in a resin matrix (see Patent Documents 5 and 6). At this time, in order to reduce attenuation of transmitted light due to Rayleigh scattering, it is preferable to uniformly disperse inorganic oxide particles having a particle diameter of 15 nm or less in the resin matrix. However, since the surface of such inorganic oxide particles has hydrophilicity, it is difficult to uniformly disperse in the resin matrix, and the transparency of the obtained organic-inorganic composite composition tends to decrease. It was.

In order to cope with such problems, the surface of oxide particles is modified by using tetragonal zirconia particles (see Patent Document 7) or by using surface modifiers such as silane coupling agents, modified silicones, and surfactants. (See Patent Documents 8 to 10). In the proposed method, a dispersion of oxide particles is once prepared in an aqueous medium, then dried, further redispersed in toluene, and then mixed with a thermoplastic resin.
JP 2002-131502 A Japanese Patent Laid-Open No. 10-298287 JP 2004-244444 A JP 2001-89537 A JP 61-291650 A JP 2003-73564 A JP 2007-99931 A JP 2007-217242 A JP 2007-262252 A JP 2007-119617 A

  However, when the oxide particles redispersed in toluene by such a method are mixed with a thermoplastic resin, there is a problem that the thermoplastic resin does not sufficiently dissolve, or the transparency of the obtained organic-inorganic composite composition is low. There is a problem of getting worse. For this reason, in order to dissolve the thermoplastic resin, it is necessary to take measures such as using a large amount of a good solvent for the thermoplastic resin or reducing the solid content concentration. The range of inorganic composite compositions has also been limited.

  The present invention has been made in view of the above circumstances, and its purpose is to provide an organic-inorganic composite composition having excellent thermoplastic resin solubility and high transparency by a simple method; It is to provide an inorganic powder. Another object of the present invention is to provide a molded article and an optical component having a high refractive index and high transparency using such an organic-inorganic composite composition.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that if an inorganic powder composed of inorganic fine particles to which at least one of an organic acid or an inorganic acid is adsorbed is used, an organic / inorganic material that meets the purpose can be obtained. It has been found that a composite composition can be easily produced, and the present invention has been completed. That is, the following present invention has been provided as means for solving the problems.

[1] An inorganic powder comprising inorganic fine particles having a particle size of 1 to 15 nm to which at least one of an organic acid or an inorganic acid is adsorbed.
[2] The inorganic powder according to [1], wherein 0.1 to 20 parts by mass of an organic acid and an inorganic acid are adsorbed to 100 parts by mass of the inorganic fine particles.
[3] The inorganic powder according to [1] or [2], wherein at least an organic acid is adsorbed on the inorganic fine particles.
[4] The inorganic powder according to [3], wherein the organic acid is acetic acid or propionic acid.
[5] The inorganic powder according to any one of [1] to [4], wherein the inorganic fine particles are zirconium oxide, titanium oxide, or a mixture thereof.

[6] A step of preparing an inorganic particle dispersion by dispersing the inorganic powder according to any one of [1] to [5] in an organic solvent, and mixing the inorganic particle dispersion with a thermoplastic resin. The manufacturing method of the organic inorganic composite composition characterized by including the process to do.
[7] The process according to [6], wherein in the step of preparing the inorganic particle dispersion, the inorganic powder is added to an organic solvent in which a surface modifier is dissolved in advance, and the dispersion treatment is performed. A method for producing an organic-inorganic composite composition.
[8] The method for producing an organic-inorganic composite composition as described in [7], wherein the surface modifier is an aromatic carboxylic acid.
[9] The above aromatic carboxylic acid is one or more compounds selected from the group consisting of 4-n-propylbenzoic acid, diphenylacetic acid, and 4-phenylbenzoic acid. The manufacturing method of organic-inorganic composite composition.
[10] The organic solvent is one or more solvents selected from the group consisting of N, N-dimethylacetamide, toluene, anisole, N-methyl-2-pyrrolidone, ethyl acetate, and butyl acetate. The method for producing an organic-inorganic composite composition according to any one of [6] to [9].

[11] An organic-inorganic composite composition produced by the production method according to any one of [6] to [10].

[12] A molded article obtained by molding the organic-inorganic composite composition according to [11].
[13] An optical component comprising the organic-inorganic composite composition according to [11].
[14] The optical component according to [13], wherein the optical component is a lens substrate.

  If the inorganic-inorganic powder of the present invention is used to produce an organic-inorganic composite composition by the production method of the present invention, the thermoplastic resin can be dissolved sufficiently and quickly, and the resulting organic-inorganic composite composition is transparent. Increases the nature. Moreover, the molded object and optical component which use the organic inorganic composite composition of this invention have high refractive index and high transparency.

  Hereinafter, the inorganic powder, the organic-inorganic composite composition of the present invention, the molded body comprising the same, and the optical component will be described in detail. The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.

[Inorganic powder]
(Characteristic)
The inorganic powder of the present invention is composed of inorganic fine particles having a particle size of 1 to 15 nm to which at least one of an organic acid and an inorganic acid is adsorbed. If an organic-inorganic composite composition is prepared using such an inorganic powder, the thermoplastic resin can be quickly and efficiently dissolved, and a highly transparent organic-inorganic composite composition can be easily provided. . Furthermore, a molded body having a high refractive index and high transparency can be provided by molding.
The content of water or methanol in the inorganic powder is preferably 10% by mass or less, and more preferably 7% by mass or less. Moreover, about content of impurities, such as sodium and potassium, it is preferable that it is 200 ppm or less, and it is more preferable that it is 60 ppm or less.

(Inorganic fine particles)
There are no particular limitations on the inorganic fine particles used in the organic-inorganic composite material of the present invention. For example, the fine particles described in JP-A Nos. 2002-241612, 2005-298717, 2006-70069, etc. are used. be able to.

Specifically, fine oxide particles (aluminum oxide, titanium oxide, niobium oxide, zirconium oxide, magnesium oxide, tellurium oxide, yttrium oxide, indium oxide, tantalum oxide, hafnium oxide, bismuth oxide, tin oxide, etc.), double oxide Fine particles (lithium niobate, potassium niobate, lithium tantalate, potassium tantalate, barium titanate, strontium titanate, lead titanate, barium zirconate, barium stannate, zircon, etc.), IIb-VIb group semiconductors (Zn, Cd chalcogen (S, Se, Te) or oxide) can be used. Of these, compounds of zirconium, zinc, tin or titanium are preferable, and specifically, it is preferable to use at least one selected from the group consisting of zirconium oxide, zinc oxide, tin oxide and titanium oxide.
Two or more kinds of inorganic fine particles may be used in combination.

  The inorganic fine particles used in the present invention may be a composite of a plurality of components from the viewpoints of refractive index, transparency, stability, and the like. In addition, the range of inorganic fine particles is wide. For example, when titanium oxide is used, for various purposes such as photocatalytic activity reduction and water absorption reduction, the surface layer is made of different metals such as silica and alumina. Surface with oxide coating, silane coupling agent, titanate coupling agent, aluminate coupling agent, organic acid (carboxylic acid, sulfonic acid, phosphoric acid, phosphonic acid, etc.) or dispersant with organic acid group It may be modified. Furthermore, these two or more types may be used in combination depending on the purpose. For example, fine particles obtained by coating tin-containing rutile titanium oxide with zirconium oxide can be preferably used.

  The refractive index of the inorganic fine particles used in the present invention is not particularly limited. However, when the organic-inorganic composite material of the present invention is used in an optical component that requires a high refractive index, the inorganic fine particles have a high refractive index characteristic. It is preferable. In this case, the refractive index of the inorganic fine particles used is preferably 1.90 to 3.00 at 22 ° C. and a wavelength of 589 nm, more preferably 2.00 to 2.70, and particularly preferably 2.10. ~ 2.50. If the refractive index of the fine particles is 3.0 or less, the difference in refractive index from the resin is relatively small, so that Rayleigh scattering tends to be easily suppressed. If the refractive index is 1.9 or more, the effect of increasing the refractive index tends to be easily obtained.

  The refractive index of the inorganic fine particles is obtained by, for example, molding a composite compounded with the thermoplastic resin used in the present invention into a transparent film, and measuring the refractive index with an Abbe refractometer (for example, “DM-M4” manufactured by Atago Co., Ltd.). It can be estimated by a method of calculating from the refractive index of only the resin component separately measured or a method of calculating the refractive index of the fine particles by measuring the refractive index of the fine particle dispersion having different concentrations. Further, a refractive index can also be obtained by preparing a thin film on a substrate such as a silicon wafer or the like by spin coating, for example, and drying it sufficiently, and then fitting an interference pattern with an ellipsometer.

  If the number average primary particle size of the inorganic fine particles used in the present invention is too small, the characteristics unique to the substance constituting the fine particles may change. Conversely, if the number average primary particle size is too large, Rayleigh scattering is used. May become noticeable, and the transparency of the organic-inorganic composite material may be extremely reduced. Therefore, the lower limit value of the number average primary particle size of the inorganic fine particles used in the present invention is preferably 1 nm or more, more preferably 2 nm or more, further preferably 3 nm or more, and the upper limit value is preferably 15 nm or less, more preferably. Is 10 nm or less, more preferably 7 nm or less. That is, the number average primary particle size of the inorganic fine particles in the present invention is preferably 1 nm to 15 nm, more preferably 2 nm to 10 nm, and particularly preferably 3 nm to 7 nm.

The inorganic fine particles used in the present invention desirably satisfy the above average particle size and have a narrow particle size distribution. There are various ways of defining such monodisperse particles. For example, the numerical value ranges described in JP-A-2006-160992 also apply to the preferable particle size distribution range of the fine particles used in the present invention. .
Here, the above-mentioned number average primary particle size can be measured by, for example, an X-ray diffraction (XRD) apparatus or a transmission electron microscope (TEM).

The method for producing inorganic fine particles used in the present invention is not particularly limited, and any known method can be used.
For example, desired oxide fine particles can be obtained by using a metal salt or an alkoxy metal as a raw material and hydrolyzing in a reaction system containing water. Details of this method are described in, for example, Japanese Journal of Applied Physics, 37, 4603-4608 (1998), or Langmuir, 16: 1, 241-246 (2000). ing.
When applying inorganic fine particles synthesized in a reaction system containing these moisture, the moisture may have an adverse effect. In such a case, it can be replaced with another appropriate organic solvent after the synthesis of the inorganic fine particles. Uniform dispersion is possible without impairing dispersibility by using an appropriate dispersant as required.

Further, as a method other than the method of hydrolyzing in water, a method of preparing inorganic fine particles in an organic solvent or an organic solvent in which the thermoplastic resin in the present invention is dissolved may be employed. In this case, various surface treatment agents (silane coupling agents, aluminate coupling agents, titanate coupling agents, organic acids (carboxylic acids, sulfones, phosphonic acids, etc.)) may be allowed to coexist as necessary. Good.
Examples of the solvent used in these methods include acetone, 2-butanone, dichloromethane, chloroform, toluene, ethyl acetate, cyclohexanone, anisole and the like. These may be used alone or as a mixture of two or more.
When preparing inorganic particles in a solution, it is important to obtain appropriate conditions that vary depending on the temperature at the time of synthesis, such as the properties of the inorganic particles, the particle size, and the aggregation state. However, it is impossible to synthesize at a temperature higher than the boiling point of the solution under normal pressure. When synthesis at a higher temperature is required, the necessary characteristics can be obtained by synthesis under high pressure using a high-pressure kettle such as an autoclave.

As a method for synthesizing the inorganic fine particles, in addition to the case of performing only in the liquid phase as described above, a firing step may be used for further high-temperature treatment. Such a firing method is performed to increase the crystallinity after forming fine particles in the liquid phase, when the raw materials are directly reacted and synthesized in the baking step, or after the precursor of the fine particles is formed in the liquid phase. In some cases, desired fine particles are synthesized in the firing step. As an example of the firing method, Japanese Patent Application Laid-Open No. 2003-19427 discloses a method in which a solution in which an inorganic fine particle raw material component and other inorganic compounds are dissolved is spray pyrolyzed to synthesize particles, and then washed with water to remove the inorganic fine particles. A method of obtaining only highly crystalline particles by removing the inorganic compound is disclosed.
Alternatively, Japanese Patent Application Laid-Open No. 2006-16236 discloses a method in which a particle precursor is formed in a liquid phase and then crystallized by firing while preventing aggregation of particles with an inorganic salt.
Furthermore, various general fine particle synthesis methods described in, for example, Japanese Patent Application Laid-Open No. 2006-70069 and the like, such as a method of producing by a vapor phase method using a vacuum process such as a molecular beam epitaxy method or a CVD method can be mentioned. it can.

The crystallinity of the inorganic fine particles varies depending on the conditions for synthesis, but inorganic particles having any crystallinity can be used depending on the situation. It may be crystalline having a clear peak when measured with an XRD apparatus or amorphous having a broad halo. In general, inorganic fine particles having a high degree of crystallinity have a higher refractive index than those having a low degree of crystallinity, which is advantageous for application to high refractive materials. However, in the case of a material having a high photocatalytic activity such as titanium oxide, it is known that the photocatalytic activity can be suppressed by lowering the crystallinity. The photocatalytic activity of the inorganic fine particles may cause a serious problem of resin degradation when the organic-inorganic composite material is irradiated with light. In such a case, it is also possible to suppress the photocatalytic activity using inorganic nanoparticles having a low crystallinity.
When the inorganic fine particles have a core-shell structure, the crystallinity of the core portion and the shell portion may be the same or completely different. These combinations may be physically determined by the crystal structure of the core portion and the shell portion, the lattice constant, and the like, but may be intentionally created depending on the synthesis conditions. A combination of core and shell that takes advantage of each characteristic is required.

  The content of the inorganic fine particles in the organic-inorganic composite material of the present invention is preferably 20 to 95% by mass, more preferably 25 to 70% by mass, particularly 30 to 60% by mass from the viewpoint of transparency and high refractive index. preferable.

(acid)
In the inorganic powder of the present invention, at least one of an organic acid or an inorganic acid is adsorbed on the inorganic fine particles.
The type of organic acid that can be adsorbed on the inorganic fine particles is not particularly limited. For example, acetic acid, propionic acid, and the like can be used, and it is particularly preferable to use acetic acid.
The kind of the inorganic acid that can be included in the inorganic fine particle dispersion of the present invention is not particularly limited. For example, hydrochloric acid, nitric acid, sulfuric acid and the like can be used, and hydrochloric acid and nitric acid are particularly preferable.

  A plurality of organic acids and inorganic acids may be used in combination, or a combination of organic acids and inorganic acids may be used. Preference is given to the case where at least an organic acid is used, and furthermore, the case where at least acetic acid or propionic acid is used. For example, a case where acetic acid or propionic acid is used alone or a case where hydrochloric acid is added thereto can be exemplified.

  The method for adsorbing the organic acid or inorganic acid to the inorganic fine particles is not particularly limited. For example, it can be adsorbed by carrying out a step of stirring the inorganic particles and the organic acid or inorganic acid for a certain period of time in a solvent, and it is sufficient that sufficient stirring can be performed, but the dispersion state of the particles is insufficient. In some cases, it is preferable to employ a dispersion method using a commercially available disperser such as an ultrasonic disperser.

  The total adsorption amount of the organic acid and the inorganic acid with respect to the inorganic fine particles is preferably 20 parts by mass or less, more preferably 0.1 to 20 parts by mass, and more preferably 0.2 to More preferably, it is 15 mass parts, and it is especially preferable that it is 0.3-13 mass parts. In adjusting the amount of adsorption, a method of preparing inorganic fine particles adsorbing a large amount of acid and desorbing by heating can be employed.

  The amount of adsorption onto the inorganic powder can be determined by thermogravimetric differential thermal analysis (TG-DTA) measurement. Specifically, it can be determined by measuring the weight loss when the temperature is raised within a specific temperature range. Prior to the measurement, an inorganic fine particle sample adsorbing a known amount of acid is prepared, a mass decrease curve with temperature rise is obtained, and a desorption component is analyzed by GC-MS or the like. Comparison is made with a mass reduction curve of an inorganic fine particle sample which is not adsorbed. By these preliminary measurement and analysis, the temperature range to be measured is determined and the target sample is measured.

[Organic-inorganic composite composition]
(Manufacturing method)
The organic-inorganic composite composition of the present invention comprises a step of dispersing the inorganic powder of the present invention in an organic solvent to prepare an inorganic particle dispersion, and a step of mixing the inorganic particle dispersion with a thermoplastic resin. It can manufacture by passing. Moreover, the process of removing a solvent by drying further after these processes may be included.

  Conventionally, inorganic fine particles were prepared in a liquid, and a dispersion was prepared by solvent substitution by an evaporation method or the like. However, when a dispersion prepared by this method is used, it is used when mixed with a thermoplastic resin. There is a problem that the thermoplastic resin does not dissolve quickly or precipitates without dissolving until the end. For this reason, when mixing with a thermoplastic resin, it has been necessary to take measures such as using a large amount of a good solvent for the thermoplastic resin or reducing the solid content. On the other hand, if a dispersion liquid in which inorganic powder composed of inorganic fine particles adsorbed with acid is dispersed according to the present invention is used, surprisingly, the thermoplastic resin dissolves quickly, and the organic matter has extremely high solubility and transparency. An inorganic composite composition can be efficiently prepared. Therefore, it is not necessary to use a large amount of a good solvent for the thermoplastic resin, and a composition having a high solid content can be obtained simply and inexpensively.

  In the first place, when the inorganic powder synthesized by removing the solvent is dispersed again, phenomena such as agglomeration often occur. Therefore, an organic-inorganic composite material using an inorganic particle dispersion containing such an agglomerate is often used. It is considered difficult to obtain molded bodies such as lenses and lenses. However, in the present invention, the particles existing in the solution containing the acid are dried and then re-dispersed in a desired solvent. We succeeded in obtaining transparent organic-inorganic composite materials and molded products that did not.

  The mixing ratio of the inorganic fine particles and the thermoplastic resin can be appropriately determined according to the use and function of the organic-inorganic composite composition to be prepared. The content of the thermoplastic resin in the organic-inorganic composite composition is preferably 5 to 80% by mass, more preferably 30 to 75% by mass, and particularly preferably 40 to 70% by mass.

(Thermoplastic resin)
The structure of the thermoplastic resin used for the organic-inorganic composite composition of the present invention is not particularly limited. For example, poly (meth) acrylic acid ester, polystyrene, polyamide, polyvinyl ether, polyvinyl ester, polyvinyl carbazole, polyolefin, polyester, polycarbonate, polyurethane, polythiourethane, polyimide, polyether, polythioether, polyether ketone, polysulfone, poly Examples thereof include resins having a known structure such as ether sulfone. From the viewpoint of the production method, vinyl polymers obtained by polymerization of vinyl monomers, polyethers obtained by polymerization of epoxy monomers, ring-opening metathesis polymerization polymers and condensation polymers (polycarbonate, polyester, polyamide, polyether ketone, polyether sulfone, etc.) However, vinyl polymers, ring-opening metathesis polymerization polymers, polycarbonates and polyesters are preferred, and vinyl polymers are more preferred from the viewpoint of production suitability. In the present invention, a thermoplastic resin having a functional group capable of forming an arbitrary chemical bond with inorganic fine particles at least at the end of the polymer chain or at the side chain is preferable.

<Unit structure represented by general formula (1)>
The thermoplastic resin used in the present invention preferably has at least one unit structure represented by the general formula (1). Moreover, it is preferable that the thermoplastic resin used by this invention is a random copolymer which has a carboxyl group in a side chain.

In general formula (1), R ^{1 to} R ³ are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkylthio group, substituted or unsubstituted. An acyloxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted amino group, or a cyano group.

  In the thermoplastic resin of the present invention, only one type of unit structure represented by the general formula (1) may be present in one molecule, or a plurality of types may be present. Further, the specific type of unit structure represented by the general formula (1) may be present continuously in a block form in the molecule or may be present randomly.

  The unit structure represented by the general formula (1) can be formed by polymerizing a monomer represented by the following general formula (2).

［一般式（１）中、Ｒ¹〜Ｒ³はそれぞれ独立に水素原子、ハロゲン原子、置換もしくは無置換のアルキル基、置換もしくは無置換のアルコキシ基、置換もしくは無置換のアルキルチオ基、置換もしくは無置換のアシルオキシ基、置換もしくは無置換のアリール基、置換もしくは無置換のアリールオキシ基、置換もしくは無置換のアリールチオ基、置換もしくは無置換のアミノ基、または、シアノ基を表す。］

[In general formula (1), R ^{1 to} R ³ are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkylthio group, substituted or unsubstituted It represents a substituted acyloxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted amino group, or a cyano group. ]

  Specific examples of the monomer represented by the general formula (2) are listed as A-1 to A-30 below, but the monomers that can be employed in the present invention are not limited to these specific examples.

  The thermoplastic resin used in the present invention preferably contains 1 to 70% by mass, more preferably 3 to 70% by mass, and more preferably 5 to 50% by mass of the unit structure represented by the general formula (1). More preferably, it is more preferably 7 to 30% by mass. The thermoplastic resin containing 1 to 70% by mass of the structural unit represented by the general formula (1) here is a monomer (general formula (2) capable of giving a structure represented by the general formula (1) by polymerization. ) Is a thermoplastic resin obtained by polymerizing the monomer mixture in the monomer mixture in an amount of 1 to 70% by mass of the total amount of monomers.

<Copolymerizable monomer>
The thermoplastic resin used by this invention can be manufactured by copolymerizing another monomer with the monomer which can form the unit structure represented by General formula (1) by superposing | polymerizing. As such other monomers, those described in Polymer Handbook 2nd ed., J. Brandrup, Wiley lnterscience (1975) Chapter 2 Page 1 to 483 can be used.

  Specifically, for example, styrene derivatives, 1-vinylnaphthalene, 2-vinylnaphthalene, vinylcarbazole, acrylic acid, methacrylic acid, acrylic esters, methacrylic esters, acrylamides, methacrylamides, allyl compounds, vinyl ethers , Vinyl esters, dialkyl itaconates, dialkyl esters of the above fumaric acid, monoalkyl esters, and the like.

  The thermoplastic resin used in the present invention preferably contains 30 to 99% by mass of structural units derived from the above copolymerizable monomer, more preferably contains 30 to 97% by mass, and more preferably 50 to 95%. It is more preferable that it is contained by mass%, and it is even more preferable that it is contained by 70 to 93 mass%. The thermoplastic resin used in the present invention preferably contains 20 to 99% by mass, more preferably 30 to 97% by mass, and more preferably 40 to 93% by mass of a unit structure derived from a vinyl monomer having an aromatic group. % Is more preferable.

  In the present invention, it is preferable to use a monomer having a functional group capable of forming a chemical bond with inorganic fine particles as a monomer that can be copolymerized. Examples of the functional group capable of forming a chemical bond with the inorganic fine particles include a functional group having the following structure.

［Ｒ¹¹、Ｒ¹²、Ｒ¹³、Ｒ¹⁴、Ｒ¹⁵、Ｒ¹⁶は、それぞれ独立に水素原子、置換または無置換のアルキル基、置換または無置換のアルケニル基、置換または無置換のアルキニル基、置換または無置換のアリール基、あるいは、塩を形成しうる原子または基を表す。］、−ＳＯ₃Ｈまたはその塩、−ＯＳＯ₃Ｈまたはその塩、−ＣＯ₂Ｈまたはその塩、−ＯＨまたはその塩、−Ｓｉ（ＯＲ¹⁷）_nＲ¹⁸ _n［Ｒ¹⁷、Ｒ¹⁸はそれぞれ独立に水素原子、置換または無置換のアルキル基、置換または無置換のアルケニル基、置換または無置換のアルキニル基、置換または無置換のアリール基、あるいは、塩を形成しうる原子または基を表し、ｎは１〜３の整数を表す。］

[R ¹¹ , R ¹² , R ¹³ , R ¹⁴ , R ¹⁵ and R ¹⁶ are each independently a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, A substituted or unsubstituted aryl group, or an atom or group capable of forming a salt. ], - SO ₃ H or salts thereof, -OSO ₃ H or a salt thereof, -CO ₂ H or a salt thereof, -OH or a salt _{^{thereof, -Si (OR 17) n R}} 18 n [R 17, R 18 are each Independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aryl group, or an atom or group capable of forming a salt; n represents an integer of 1 to 3. ]

  In order to introduce a functional group capable of forming a chemical bond with inorganic particles into a thermoplastic resin, a method of performing a polymerization reaction using a polymerizable monomer having the functional group or a precursor thereof, or reacting the resin with a reactant And a method of introducing the functional group or a precursor thereof. In view of easy control of the amount of functional group introduced, it is preferable to employ a method of obtaining a resin by performing a polymerization reaction using a polymerization monomer having the functional group or a precursor thereof.

  When a resin is obtained by a polymerization reaction, a monomer capable of undergoing a polymerization reaction with other monomers used in the present invention, such as a diol compound, a dithiol compound, or a dicarboxylic acid compound, is employed as a monomer having a functional group capable of forming a chemical bond with inorganic particles. be able to.

  The thermoplastic resin used in the present invention preferably contains 0.1 to 5% by mass, more preferably 0.3 to 3% by mass of a structural unit derived from the vinyl monomer having the functional group. It is more preferable to contain -2.5 mass%. In the thermoplastic resin used in the present invention, the average number of functional groups is preferably 0.1 to 20, more preferably 0.5 to 10, more preferably 1 to 5 per polymer chain. It is particularly preferred that

  Examples of the monomer that can be copolymerized with the monomer capable of forming the unit structure represented by the general formula (1) by polymerization include the following, but can be employed in the present invention. The monomer is not limited to these specific examples. In the following, n represents an integer of 1 or more.

The number average molecular weight of the thermoplastic resin used in the present invention is preferably 10,000 to 200,000, more preferably 20,000 to 200,000, and even more preferably 50,000 to 200,000.
The glass transition temperature (Tg) of the thermoplastic resin used in the present invention is preferably 80 ° C. to 400 ° C., more preferably 100 to 380 ° C. from the viewpoint of heat resistance and moldability, and 100 to 300. More preferably, the temperature is C.

  There is no particular limitation on the refractive index of the thermoplastic resin used in the present invention, but when the organic-inorganic composite composition of the present invention is used in an optical component that requires a high refractive index, the thermoplastic resin has a high refractive index. It is preferable to have characteristics. In this case, the refractive index of the thermoplastic resin used is preferably 1.55 or more at a wavelength of 22 ° C. and 589 nm, more preferably 1.57 or more, and further preferably 1.58 or more. .

(Additive)
In the present invention, in addition to the essential components of the present invention such as the above-mentioned thermoplastic resin and inorganic fine particles, various additives may be appropriately blended from the viewpoints of uniform dispersibility, flowability during molding, releasability, weather resistance, and the like. For example, a surface treatment agent, a plasticizer, an antistatic agent, a dispersant, a release agent, and the like can be given. Further, a resin other than the resins specifically listed above may be added as the thermoplastic resin, and there is no particular limitation on the type of such resin, but the same optical physical properties, thermal physical properties as the thermoplastic resin, Those having a molecular weight are preferred.
Although the blending ratio of these additives varies depending on the purpose, it is preferably 0 to 50% by mass and preferably 0 to 30% by mass with respect to the total amount of the inorganic fine particles and the thermoplastic resin. More preferably, it is particularly preferably 0 to 20% by mass.

<Plasticizer>
When the glass transition temperature of the thermoplastic resin in the present invention is high, molding of the organic-inorganic composite composition may not always be easy. For this reason, a plasticizer may be used to lower the molding temperature of the organic-inorganic composite composition of the present invention. When the plasticizer is added, the addition amount is preferably 1 to 50% by mass, more preferably 2 to 30% by mass, and 3 to 20% by mass based on the total amount of the organic-inorganic composite composition. It is particularly preferred.
The plasticizer that can be used in the present invention needs to be considered in total, such as compatibility with the resin, weather resistance, and plasticizing effect, and since the optimal plasticizer depends on other materials, it cannot be said unconditionally, From the viewpoint, those having an aromatic ring are preferred. As a typical example of a preferable compound, a compound represented by the following general formula (11) can be given.

［一般式（１１）中、Ｒ¹およびＲ²はそれぞれ独立に置換基を表す。Ｌはオキシ基もしくはメチレン基を表す。ａは０もしくは１を表す。ｍ１およびｍ２はそれぞれ独立に０〜５の整数を表す。］

[In General Formula (11), R ¹ and R ² each independently represents a substituent. L represents an oxy group or a methylene group. a represents 0 or 1; m1 and m2 each independently represents an integer of 0 to 5. ]

  A compound represented by any one of the following general formulas (12) to (14) is also preferable as a plasticizer.

［一般式（１２）〜（１４）において、Ｒ³、Ｒ⁴、Ｒ⁵、Ｒ⁶およびＲ⁷はそれぞれ独立に置換基を表す。Ｚ¹、Ｚ²、Ｚ³およびＺ⁴はそれぞれ独立に水素原子または置換基を表す。ｍ３、ｍ４およびｍ６はそれぞれ独立に０〜４の整数を表す。ｍ５およびｍ７はそれぞれ独立に０〜５の整数を表す。ｂ１、ｂ２およびｂ３はそれぞれ独立に２以上の整数を表す。］

[In General Formulas (12) to (14), R ³ , R ⁴ , R ⁵ , R ⁶ and R ⁷ each independently represent a substituent. Z ¹ , Z ² , Z ³ and Z ⁴ each independently represent a hydrogen atom or a substituent. m3, m4 and m6 each independently represents an integer of 0 to 4. m5 and m7 each independently represents an integer of 0 to 5. b1, b2 and b3 each independently represents an integer of 2 or more. ]

  Furthermore, the compound represented by the following general formula (15) is also preferable as the plasticizer.

［一般式（１５）中、Ｒａ、ＲｂおよびＲｃはそれぞれ独立に置換基を表す。Ａ¹はオキシ基もしくはメチレン基を表す。Ａ²はオキシ基、置換もしくは無置換のアルキレン基、カルボニル基、置換もしくは無置換のイミノ基、またはこれら２以上の基からなる基を表す。ｎ１およびｎ２はそれぞれ独立に０〜５の整数を表す。ｎ３は０〜４の整数を表す。ｐ、ｑおよびｒはそれぞれ独立に０もしくは１を表す。ただし、ｑが０の時、ｒは０である。］

[In the general formula (15), Ra, Rb and Rc each independently represents a substituent. A ¹ represents an oxy group or a methylene group. A ² represents an oxy group, a substituted or unsubstituted alkylene group, a carbonyl group, a substituted or unsubstituted imino group, or a group composed of two or more groups. n1 and n2 each independently represents an integer of 0 to 5. n3 represents an integer of 0 to 4. p, q and r each independently represents 0 or 1; However, when q is 0, r is 0. ]

(Properties of organic-inorganic composite composition)
The organic-inorganic composite composition of the present invention is highly transparent and has a characteristic of exhibiting a high refractive index when molded to a specific thickness. Moreover, since the corrosion resistance with respect to metal mold | die, such as stainless steel, is strong at the time of shaping | molding, the damage with respect to a metal mold | die can be suppressed effectively. Therefore, the organic-inorganic composite composition of the present invention is useful when molding is repeated using the same mold.

  The transmittance when the organic-inorganic composite composition of the present invention is formed to a thickness of 1 mm is preferably 70% or more, more preferably 75% or more, and further preferably 80% or more.

[Method for producing molded article]
When the inorganic fine particle dispersion of the present invention and a thermoplastic resin solution are mixed to prepare an organic-inorganic composite composition, a transparent molded body can be obtained by cast molding in a solution state. According to this method, a molded body can be manufactured very simply and quickly at a low cost. Moreover, the transparency of the obtained molded body is extremely high. In the case of molding using a conventional organic-inorganic composite composition, since there is a possibility of cloudiness, it is often necessary to slow down the drying rate and dry over time. In the case of molding using the composition, it can be quickly dried because there is no fear of cloudiness. Since a transparent molded body can be obtained even if dried without taking time, according to the present invention, the production efficiency can be increased and the production cost can be suppressed.

  The molded body can also be produced by a method other than the cast molding described above. For example, the solvent is removed from the organic-inorganic composite composition of the present invention by methods such as concentration, lyophilization, or reprecipitation from an appropriate poor solvent, and then the powdered solid is injection molded or compression molded. It can also be formed by a known method such as At this time, the powdered organic-inorganic composite composition can be directly processed into a molded body such as a lens by heating, melting, or compressing, but once a preform having a certain weight and shape is obtained by a method such as an extrusion method. After producing the (precursor), the preform can be deformed by compression molding to produce an optical component such as a lens. In this case, the preform can have an appropriate curvature in order to efficiently create the target shape.

  Moreover, you may mix and use the said organic inorganic composite composition in other resin as a masterbatch.

[Optical parts]
The optical component of the present invention can be produced by molding the organic-inorganic composite composition of the present invention described above.
As the optical component of the present invention, those showing the refractive index and optical characteristics described above in the explanation of the organic-inorganic composite composition are useful.
In addition, as the optical component of the present invention, a high refractive index optical component having a thickness of at most 0.1 mm is particularly useful. It is preferably applied to an optical component having a thickness of 0.1 to 5 mm, and particularly preferably applied to a transparent article having a thickness of 1 to 3 mm.
These thick molded bodies are usually difficult to remove in the solvent casting method because the solvent is difficult to remove, but by using the organic-inorganic composite composition of the present invention, molding is easy and complex shapes such as aspherical surfaces are also easy. Thus, an optical component having good transparency can be obtained while utilizing the high refractive index characteristics of the oxide particles.

  The optical component using the organic-inorganic composite composition of the present invention is not particularly limited as long as it is an optical component using the excellent optical properties of the organic-inorganic composite composition of the present invention. It can also be used for optical components that transmit light (so-called passive optical components). Functional devices including such optical components include various display devices (liquid crystal display, plasma display, etc.), various projector devices (OHP, liquid crystal projector, etc.), optical fiber communication devices (optical waveguide, optical amplifier, etc.), cameras, videos, etc. The imaging device is exemplified. Examples of the passive optical component in such an optical functional device include a lens, a prism, a prism sheet, a panel, a film, an optical waveguide, an optical disc, an LED sealing agent, and the like.

[lens]
An optical component using the organic-inorganic composite composition of the present invention is particularly suitable for a lens substrate. The lens substrate manufactured using the organic-inorganic composite composition of the present invention has both light transmittance and light weight, and is excellent in optical properties. Moreover, it is possible to arbitrarily adjust the refractive index of the lens substrate by appropriately adjusting the type of monomer constituting the organic-inorganic composite composition and the amount of oxide particles to be dispersed.
The “lens substrate” in the present invention means a single member capable of exhibiting a lens function. A film or a member can be provided on the surface or the periphery of the lens substrate according to the use environment or application of the lens. For example, a protective film, an antireflection film, a hard coat film, or the like can be formed on the surface of the lens substrate. Further, the periphery of the lens base material can be fitted and fixed to a base material holding frame or the like. However, these films and frames are members added to the lens base material referred to in the present invention, and are distinguished from the lens base material itself referred to in the present invention.

As a method for molding the organic-inorganic composite composition on the lens substrate, three typical methods are shown below. However, the molding method of the lens base material of the present invention is not limited to these.
(1) The dispersion of the organic-inorganic composite composition is dried and solidified into, for example, a dry powder having a specific surface area (surface area / volume) of 15 mm ⁻¹ or more, and the obtained powder is heated and compressed to form a lens base having a predetermined shape. It can be a material.
(2) A lens-shaped organic-inorganic composite composition having a size equal to or slightly larger than the lens substrate to be manufactured by dropping a dispersion of the organic-inorganic composite composition into a liquid insoluble in the organic-inorganic composite composition A state in which the dispersion of the substance floats on the liquid surface is formed. At this time, the composition of the dispersion liquid and the type of the liquid are selected so that the interface between the dispersion liquid and the liquid and the interface between the dispersion liquid and the air are both convex surfaces due to the interfacial tension. By removing the dispersion medium from the formed lens-shaped dispersion, a lens substrate having a predetermined shape can be obtained. Further, after that, at least one step of pressing, heating and compression can be further performed to obtain a desired shape.
(3) Using an apparatus such as an extruder, the organic-inorganic composite composition is heated to extrude, the extruded material is cut to form a bulky intermediate, and then the intermediate is heated and compressed by press molding. By doing so, a lens substrate can be obtained.

  When the lens substrate in the present invention is used as a lens, the lens substrate itself of the present invention may be used alone as a lens, or may be used as a lens with a film or a frame added as described above. . The type and shape of the lens using the lens substrate of the present invention are not particularly limited. The lens substrate of the present invention is, for example, an eyeglass lens, an optical device lens, an optoelectronic lens, a laser lens, a pickup lens, an imaging lens (an in-vehicle camera lens, a portable camera lens, a digital camera lens, etc .; (Including various known imaging lenses such as zoom lenses and positive / negative power lenses), OHP lenses, microlens arrays, and the like).

  The features of the present invention will be described more specifically with reference to the following examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples shown below.

[Example 1]
(1) Preparation and analysis of inorganic powder Using zirconium oxychloride octahydrate as a raw material, zirconia particles are prepared in a solution, and a process corresponding to a general process (a process to remove unreacted raw materials and impurities) is performed. Thereafter, acetic acid was added and sufficiently stirred to synthesize inorganic powder adsorbed with acetic acid. From the TEM, it was confirmed that the number average particle size of the inorganic fine particles was 3.4 nm and the standard deviation was 0.4 nm. The refractive index of the inorganic powder was 2.1.
The amount of acetic acid adsorbed onto the inorganic powder was determined from the weight loss when the temperature was increased from 250 ° C. to 500 ° C. by thermogravimetric differential thermal analysis (TG-DTA) measurement in nitrogen. The fact that the mass decrease in this temperature range is due to the desorption of acetic acid is due to the analysis of the desorbed component (GC-MS, etc.) and the comparison with the result of measuring the sample when no organic acid such as acetic acid is used. Confirmed. The acetic acid adsorption amount in the inorganic powder of Example 1 was 12.8 parts by mass with respect to 100 parts by mass of the inorganic fine particles.

(2) Preparation of butyl acetate dispersion of inorganic powder (powder dispersion method)
10.00 g of 4-n-propylbenzoic acid was dissolved in 450.00 g of butyl acetate. Next, the inorganic powder prepared in (1) was mixed at 50.00, and sufficiently stirred with an ultrasonic disperser to prepare a butyl acetate dispersion of inorganic powder.
The transparency of the obtained dispersion was first visually evaluated. About what is judged to be highly transparent, a dispersion liquid is put in a 10 mm-thick cell, and an ultraviolet-visible absorption spectrum measuring apparatus “UV-3100” (manufactured by Shimadzu Corporation) is used at a wavelength of 550 nm. The transmittance was measured. The results are shown in Table 1.

(3) Preparation of organic-inorganic composite composition Inorganic powder dispersed in butyl acetate in (2) in a solution in which 100 parts by mass of a polymer having the following structure and 9 parts by mass of m-terphenyl were dissolved in butyl acetate. The dispersion was added dropwise over 5 minutes and stirred for 1 hour, followed by heat treatment at 50 ° C. for 1 hour, and then the solvent was removed to obtain an organic-inorganic composite composition. The composition of the organic-inorganic composite composition is 45.83% by mass of a polymer having the following structure, 41.67% by mass of fine zirconium oxide particles, 8.33% by mass of 4-n-propylbenzoic acid, and m-terphenyl. Was 4.17% by mass.
About the obtained organic-inorganic composite composition in a solution state, the transparency was visually evaluated according to the following criteria. The results are shown in Table 1.
○ It is transparent and no turbidity is seen.
Δ: Some turbidity is observed.
× It is cloudy.

(4) Molding The obtained organic-inorganic composite composition is introduced into a mold (a round mold having a diameter of 5.08 cm) whose surface in contact with the composition is made of Stabux steel, and is compression-molded. A molded body having a thickness of 1.0 mm was obtained.
About the obtained molded object, transparency was evaluated visually according to the same standard as (3). Further, the refractive index of the molded body was measured with an Abbe refractometer (“DR-M4” manufactured by Atago Co., Ltd.) using light having a wavelength of 589 nm. The results are shown in Table 1.

[Example 2]
An inorganic powder having an acid adsorption amount of 8.6 parts by mass was synthesized by introducing an amount of acetic acid different from that in Example 1 into the zirconia particle-containing liquid obtained in the same manner as in Example 1. did. Using this inorganic powder, a dispersion, an organic-inorganic composite composition, and a molded body were prepared and evaluated by performing the same procedure as in Example 1. The results are shown in Table 1.

[Example 3]
The inorganic powder of Example 2 was heated in air at 200 ° C. for 1 hour to synthesize an inorganic powder having an acid adsorption amount of 6.5 parts by mass. Using this inorganic powder, a dispersion, an organic-inorganic composite composition, and a molded body were prepared and evaluated by performing the same procedure as in Example 1. The results are shown in Table 1.

[Example 4]
The inorganic powder of Example 2 was heated in air at 400 ° C. for 1 hour to synthesize an inorganic powder having an acid adsorption amount of 2.5 parts by mass. Using this inorganic powder, a dispersion, an organic-inorganic composite composition, and a molded body were prepared and evaluated by performing the same procedure as in Example 1. The results are shown in Table 1.

[Example 5]
By introducing propionic acid into an N, N-dimethylacetamide (DMAc) dispersion of zirconia, an inorganic powder having an adsorption amount of propionic acid of 5.1 parts by mass was synthesized. Using this inorganic powder, a dispersion, an organic-inorganic composite composition, and a molded body were prepared and evaluated by performing the same procedure as in Example 1. The results are shown in Table 1.

[Comparative Example 1]
In Comparative Example 1, a dispersion of inorganic fine particles was prepared and used by solvent substitution according to the following procedure according to a conventional method (solvent substitution method).
A zirconium oxychloride solution having a concentration of 50 g / l was neutralized with a 48% aqueous sodium hydroxide solution to obtain a hydrated zirconium dispersion. The dispersion was filtered and washed with ion exchange water to obtain a hydrated zirconium cake. This cake was adjusted to a concentration of 15% by mass in terms of zirconium oxide using ion-exchanged water as a solvent, put in an autoclave, and hydrothermally treated at 150 ° C. and 150 ° C. for 24 hours to obtain a zirconium oxide fine particle dispersion. The production of zirconium oxide fine particles having a number average particle size of 3.2 nm and a standard deviation of 0.5 nm was confirmed by TEM. After the obtained zirconium fine particle dispersion was filtered, a zirconium oxide fine particle dispersion having a concentration of 10% by mass in terms of zirconium oxide using methanol as a solvent was obtained.
9.00 g of 4-n-propylbenzoic acid was dissolved in 500.00 g of butyl acetate. This was added to 450.00 g of the zirconium oxide fine particle dispersion prepared above and stirred sufficiently. Thereafter, methanol was evaporated by evaporation until the solid content became 8.5% by mass to prepare a butyl acetate dispersion of fine zirconium oxide particles.

Using this dispersion, the same procedure as in Example 1 was performed to prepare and evaluate an organic-inorganic composite composition and a molded body. The results are shown in Table 1.
When the butyl acetate dispersion of the zirconium oxide fine particles of Comparative Example 1 was mixed with a thermoplastic resin, the thermoplastic resin precipitated and precipitation occurred.

[Comparative Example 2]
In Comparative Example 2, acetic acid was added during the preparation of the dispersion using inorganic powder composed of inorganic fine particles to which no acid was adsorbed. That is, 9.00 g of 4-n-propylbenzoic acid and acetic acid were dissolved in 450.00 g of butyl acetate. Next, an inorganic powder not adsorbed with acid is added. The mixture was mixed by ultrasonic dispersion treatment and sufficiently stirred to prepare a butyl acetate dispersion of inorganic powder. The amount of acetic acid added was 22.0 parts by mass with respect to 100 parts by mass of the inorganic powder.
Using the obtained dispersion, an organic-inorganic composite composition and a molded body were prepared and evaluated by the same procedure as in Example 1. The results are shown in Table 1.

[Comparative Example 3]
The inorganic powder of Example 2 was heated in air at 750 ° C. for 1 hour to synthesize an inorganic powder to which no acid was adsorbed. Using this inorganic powder, a dispersion, an organic-inorganic composite composition, and a molded body were prepared and evaluated by performing the same procedure as in Example 1. The results are shown in Table 1.

  As is clear from the results in Table 1, the organic-inorganic composite compositions of Examples 1 to 5 produced using inorganic powders that satisfy the conditions of the present invention have good thermoplastic resin solubility and are transparent. High nature. Moreover, the molded object produced using these organic inorganic composite compositions has high refractive index and high transparency. In contrast, the molded body of Comparative Example 1 prepared by a conventional solvent exchange method without using inorganic powder, or the molded body of Comparative Example 2 and Comparative Example 3 using an inorganic powder to which no acid was adsorbed. Was not transparent. From the above, the superiority of the present invention is supported.

Claims (14)

  An inorganic powder comprising inorganic fine particles having a particle size of 1 to 15 nm to which at least one of an organic acid or an inorganic acid is adsorbed.   The inorganic powder according to claim 1, wherein 0.1 to 20 parts by mass of an organic acid and an inorganic acid are adsorbed with respect to 100 parts by mass of the inorganic fine particles.   The inorganic powder according to claim 1 or 2, wherein at least an organic acid is adsorbed on the inorganic fine particles.   The inorganic powder according to claim 3, wherein the organic acid is acetic acid or propionic acid.   The inorganic powder according to any one of claims 1 to 4, wherein the inorganic fine particles are zirconium oxide, titanium oxide, or a mixture thereof.   A step of preparing an inorganic particle dispersion by dispersing the inorganic powder according to any one of claims 1 to 5 in an organic solvent, and a step of mixing the inorganic particle dispersion with a thermoplastic resin. The manufacturing method of the organic inorganic composite composition characterized by these.   7. The organic-inorganic composite according to claim 6, wherein in the step of preparing the inorganic particle dispersion, the inorganic powder is added to an organic solvent in which a surface modifier is dissolved in advance to perform a dispersion treatment. A method for producing the composition.   The method for producing an organic-inorganic composite composition according to claim 7, wherein the surface modifier is an aromatic carboxylic acid.   The organic / inorganic according to claim 8, wherein the aromatic carboxylic acid is one or more compounds selected from the group consisting of 4-n-propylbenzoic acid, diphenylacetic acid, and 4-phenylbenzoic acid. A method for producing a composite composition.   The organic solvent is one or more solvents selected from the group consisting of N, N-dimethylacetamide, toluene, anisole, N-methyl-2-pyrrolidone, ethyl acetate, and butyl acetate. The manufacturing method of the organic inorganic composite composition as described in any one of 6-9.   The organic inorganic composite composition manufactured by the manufacturing method as described in any one of Claims 6-10.   The molded object which shape | molded the organic inorganic composite composition of Claim 11.   An optical component comprising the organic-inorganic composite composition according to claim 11.   The optical component according to claim 13, wherein the optical component is a lens substrate.