JP2012053261A - Compact manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact manufacturing method with which a compact, which can be used as a light control film which is thin and has a high scattering intensity, can be produced from a wide range of materials.SOLUTION: A compact manufacturing method according to the present invention in which a compact is provided with a thin-plate-like transparent matrix 2 and a plurality of transparent parts 4 provided in the matrix includes: a step in which a precursor 24 having the thin-plate-like matrix and a plurality of parts which are dispersed in the matrix and different from the matrix in their composition or density is impregnated with a polymerizable composition 26; and a step in which the polymerizable composition is polymerized.

Description

  The present invention relates to a method for producing a molded body, and more particularly to a method for producing a sheet or film-like molded body used as an optical article having optical characteristics such as diffraction, deflection, and diffusion.

  Since polymer materials have many types of materials that can be selected and can provide various functions, attempts to apply the polymer materials to optical applications have been actively made in recent years. For example, it has been proposed to use a molded body of a polymer material in which a one-dimensional or two-dimensional microstructure is formed as a light control element.

  As such a molded body, there is known a light control film in which a plurality of columnar structures having a refractive index different from that of a matrix are formed in a transparent matrix (Patent Documents 1 and 2).

  Such a light control film is produced, for example, by irradiating a coating film of an uncured photopolymerizable composition with parallel light at a certain angle to polymerize the photopolymerizable composition. As the photopolymerizable composition, a mixture of monomers having a polymerizable carbon-carbon double bond and a photopolymerization initiator is mainly used.

  In these light control films, a plurality of columnar structures are oriented in a specific direction from one main surface of the film to the other main surface inside the film, and light (incident incident) is incident in parallel to this orientation direction. The angle of 0 °) is most strongly scattered, and the scattering intensity decreases as the incident angle increases.

  The incident angle dependency of the scattering intensity is suitable for applications such as improving the contrast of a display device that emits light at a predetermined angle, expanding the viewing angle, and expanding the viewing angle of a reflective / transmissive projection screen. In addition, studies are underway to apply the light control film as described above to display devices, reflective / transmissive projection screens, and the like.

JP-A-1-77001 JP 2005-265915 A

  When the light control film (molded body) as described above is used in a device such as a display device or a screen, it is preferable that the light control film (molded body) is thin and has high scattering intensity from the viewpoint of downsizing the device.

  In order to increase the scattering intensity of the light control film, it is necessary to increase the length of the columnar structure or increase the difference in refractive index between the matrix and the columnar structure.

  However, if the length of the columnar structure is increased, the light control film (molded body) becomes thick, which is against the demand for downsizing the apparatus.

  In order to increase the difference in refractive index between the matrix and the columnar structure, a method using a mixture of two kinds of materials having a large difference in refractive index as the photopolymerizable composition constituting the molded body can be mentioned.

  However, since two types of materials having a large difference in refractive index are often difficult to be compatible, it is difficult to obtain a transparent mixture suitable for photopolymerization. Further, a photopolymerizable composition as a raw material for a molded product There is a problem that there are fewer options.

  The present invention has been made in view of the above problems, and provides a method for producing a molded body that can be manufactured from a wide range of materials that can be used as a light control film that is thin and has high scattering intensity. Objective.

According to the present invention,
A method for producing a molded body comprising a thin plate-like transparent matrix and a plurality of transparent portions arranged in the matrix,
Impregnating a polymerizable composition with a precursor comprising a lamellar matrix and a plurality of parts dispersed in the matrix and having different composition or density;
Polymerizing the polymerizable composition, and
The manufacturing method of the molded object characterized by this.

  According to such a configuration, it is possible to obtain a molded body in which a portion having a large refractive index difference from the matrix is arranged in a matrix from a wide range of materials.

According to another preferred embodiment of the invention,
The precursor is made of a photopolymerizable composition, and the transparent portion is a plurality of columnar structures having a refractive index different from that of the matrix disposed in the matrix.

According to another preferred embodiment of the present invention, the polymerizable composition is a photopolymerizable composition.
According to another preferred embodiment of the present invention, the polymerizable composition is a thermopolymerizable composition.

According to another aspect of the invention,
A molded article comprising a cured product of a photopolymerizable composition and a polymerizable composition, comprising a thin plate-like matrix and a plurality of columnar structures disposed in the matrix,
The plurality of columnar structures have a refractive index different from that of the matrix, and are arranged in a lattice in an orientation extending in the thickness direction of the matrix in the matrix,
The columnar structure and the matrix have different densities of the polymerizable composition,
There is provided a molded body characterized by the above.

  According to the present invention having such a configuration, there is provided a method of manufacturing a molded body that can be manufactured from a wide range of materials that can be used as a light control film that is thin and has high scattering intensity.

It is the typical perspective view which saw through the internal structure of the molded object manufactured with the manufacturing method of the molded object of preferable embodiment of this invention. It is drawing explaining the manufacturing method of the precursor used with the manufacturing method of the molded object of preferable embodiment of this invention. It is drawing explaining the manufacturing method of the molded object of preferable embodiment of this invention.

  Hereinafter, the molded object 1 manufactured with the manufacturing method of the molded object of preferable embodiment of this invention is demonstrated in detail. FIG. 1 is a schematic perspective view seen through the internal structure of the molded body 1.

  As shown in FIG. 1, the molded body 1 has a plate shape having a substantially uniform thickness. The molded body 1 has a phase separation structure including a thin plate-like matrix 2 which is a substrate and has a transparent thickness of 20 to 1000 μm, and a large number of transparent columnar structures 4 arranged in the matrix 2. Yes. The matrix 2 and each columnar structure 4 have different refractive indexes.

  The columnar structures 4 have a substantially cylindrical shape and are arranged so as to extend in parallel to each other in a direction perpendicular to the surface from the front surface to the back surface of the molded body 1. Further, as shown in FIG. 1, in the molded body 1, a large number of columnar structures 4 are arranged in a hexagonal lattice pattern along the surface of the molded body. It may be an array or other regular or irregular array. Further, in the molded body 1, the columnar structure 4 has a substantially cylindrical shape, but may be another column shape, an elliptical column, a rectangular column, or the like.

  The diameter (long axis of circumscribed circle in the case of a polygonal or elliptical column) 6 in the cross section of the columnar structure 4 is preferably in the range of 80 nm to 1000 μm, and more preferably in the range of 100 nm to 50 μm. .

  The interval 8 between adjacent columnar structures 4 is preferably in the range of 80 nm to 1000 μm, and more preferably in the range of 100 nm to 50 μm.

  In the molded body 1, the columnar structure 4 can sufficiently exhibit an interference effect with respect to light in the wavelength range of 350 to 2000 nm by setting the long axis 6 or the array period 8 of the cross section within this range. For example, advanced light control is possible in a wavelength range that can be used in general optical applications such as a light control film.

  Specifically, the molded body 1 having such a structure has an anisotropic scattering characteristic that scatters light incident in parallel to the alignment direction of the columnar structure 4 (that is, the direction along the axial direction of the columnar structure). Functions as a light control film.

Next, the manufacturing method of the molded object 1 of preferable embodiment of this invention is demonstrated.
In the method for producing a molded body according to this embodiment, a polymerizable composition is impregnated into a precursor in which parts having different structures or densities are dispersed in a base, and this polymerizable composition is polymerized. And increasing the difference in properties between the base and the parts of different tissue or density.

  First, the precursor will be described. In the method for producing a molded body according to this embodiment, the molded body is produced by curing a photopolymerizable composition, and includes a thin plate-like matrix and a plurality of columnar structures regularly arranged in the matrix. The body is used as a precursor.

(Precursor production method)

  The precursor is produced by a method obtained by irradiating an uncured photopolymerizable composition arranged in a thin plate shape with photo-polymerization by irradiating parallel light, interference exposure (holographic exposure), or the like. The method of obtaining a precursor by irradiating an uncured photopolymerizable composition arranged in a thin film with parallel light (ultraviolet light) to polymerize the photopolymerizable composition is to continuously produce a large area precursor. It is particularly preferable because it is suitable for

  As a method for arranging the photopolymerizable composition in a thin film, there is a method of applying the photopolymerizable composition onto a substrate. For example, the photopolymerizable composition has a uniform thickness on one surface of the substrate, and a known coating such as a bar coater, a slit die coater, a spin coater, a circular coater, a gravure coater, or a CAP coater so that the coating film surface is smooth. The method of apply | coating by the method is mentioned.

  Further, in this embodiment, as a method for arranging the photopolymerizable composition in a thin film shape, an uncured photopolymerizable composition 10 as shown in FIG. The method of manufacturing the precursor is adopted. Specifically, the lower base material 12, the upper base material 14, and the spacer 16 are arranged apart from each other by a predetermined distance, and inside the liquid-tight space 18 surrounded by the lower base material 12, the upper base material 14, and the spacer 16. Is filled with a liquid uncured photopolymerizable composition 10.

  In this method, since the photopolymerizable composition 10 is irradiated with parallel light through the upper base material 14, the upper base material 14 is used for light used when photopolymerizing the photopolymerizable composition 10 (for example, It must be made of a material that does not absorb (ultraviolet light). Examples of such a material include transparent plastic materials such as Pyrex (registered trademark) glass, quartz glass, and fluorinated (meth) acrylic resin.

  The thickness of the photopolymerizable composition 10 coated on the substrate or filled in the liquid-tight space 18 is preferably 20 to 1000 μm, and more preferably 50 to 300 μm. When the thickness of the photopolymerizable composition 10 is 20 μm or less, it becomes difficult to form a columnar structure in the matrix, and when it is 1000 μm or more, a columnar structure extending from the surface of the precursor to the back surface is formed. This is because it becomes difficult.

  In the precursor produced by polymerizing the photopolymerizable composition 10, a columnar structure is formed in the matrix (base material) during the photopolymerization process. It will be distributed.

  In order to obtain such a structure in which portions having different compositions or densities are dispersed and arranged therein, it is preferable that the uncured photopolymerizable composition 10 contains two or more components. Specifically, a mixture of two or more monomers, a mixture of one or more monomers and a polymer, or the like is used. In addition, the polyfunctional monomer is preferable as the photopolymerizable composition 10 because it forms a cross-linked structure and tends to cause a density distribution due to a difference in polymerization degree.

  Further, when the polymer of the photopolymerizable composition 10 is used as a precursor, the polymer does not dissolve in the polymerizable composition 20 when the polymerizable composition 20 is impregnated in a later step. It is necessary to select the photopolymerizable composition 10.

  In the present embodiment, as the photopolymerizable composition 10, the following compounds are used as a single compound or a mixture, and in particular, a polyfunctional monomer or a monofunctional monomer having a polymerizable carbon-carbon double bond is used.

  Specific examples of the polyfunctional monomer include triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6 -Hexanediol di (meth) acrylate, hydrogenated dicyclopentadienyl di (meth) acrylate, ethylene oxide modified bisphenol A di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, Tetramethylolmethane tetra (meth) acrylate, pentaerythritol hexa (meth) acrylate, polyfunctional epoxy (meth) acrylate, polyfunctional urethane (meth) acrylate, divinylbenzene, toluene Examples include allyl cyanurate, triallyl isocyanurate, triallyl trimellitate, diallyl chlorendate, N, N′-m-phenylene bismaleimide, diallyl phthalate, and the like. These may be used alone or as a mixture of two or more. The

  Specific examples of the monofunctional monomer include, for example, methyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, ethyl carbitol (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, isobornyl (meth) acrylate, phenyl Carbitol (meth) acrylate, nonylphenoxyethyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, (meth) acryloyloxyethyl succinate, (meth) acryloyloxyethyl phthalate, phenyl (meth) acrylate , Cyanoethyl (meth) acrylate, Tribromophenyl (meth) acrylate, Phenoxyethyl (meth) acrylate, Tribromophenoxyethyl (meth) acrylate, Ben (Meth) acrylate, p-bromobenzyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, trifluoroethyl (meth) acrylate, 2,2,3,3-tetrafluoropropyl (meth) ) (Meth) acrylate compounds such as acrylate; vinyl compounds such as styrene, p-chlorostyrene, vinyl acetate, acrylonitrile, N-vinyl pyrrolidone, vinyl naphthalene; allyl compounds such as ethylene glycol bisallyl carbonate, diallyl phthalate, diallyl isophthalate Etc.

  Since the homopolymer of the monofunctional monomer is often dissolved in the polymerizable composition to be impregnated in the next step, the photopolymerizable composition 10 is preferably composed of two or more components including a polyfunctional monomer.

  In addition, the photopolymerizable composition 10 may be a homogeneously dissolved mixture containing the polyfunctional monomer or oligomer and a compound having no polymerizable carbon-carbon double bond.

  Examples of the compound having no polymerizable carbon-carbon double bond include polymers such as polystyrene, polymethyl methacrylate, polyethylene oxide, polyvinyl pyrrolidone, polyvinyl alcohol, and nylon, toluene, n-hexane, cyclohexane, acetone, and methyl ethyl ketone. , Low molecular weight compounds such as methyl alcohol, ethyl alcohol, ethyl acetate, acetonitrile, dimethylacetamide, dimethylformamide, and tetrahydrofuran, organic halogen compounds, organosilicon compounds, plasticizers, additives such as stabilizers, and the like.

  The compound having no polymerizable carbon-carbon double bond is preferably in the range of 1 to 99% by mass, and more preferably in the range of 1 to 50% by mass in the total amount with the monomers. By setting the mass% of the compound having no polymerizable carbon-carbon double bond within the above range, a composition distribution suitable for the precursor can be generated.

  Further, among the compounds having no polymerizable carbon-carbon double bond, particularly low molecular weight compounds are replaced with the polymerizable composition in a step of impregnating the polymerizable composition into a precursor described later, and a larger amount is obtained. This is preferable for the photopolymerizable composition used for the production of the precursor.

  The photopolymerization initiator added to the photopolymerizable composition 10 is not particularly limited as long as it is used in normal photopolymerization in which polymerization is performed by irradiating active energy rays such as ultraviolet rays. , Benzophenone, benzyl, Michler's ketone, 2-chlorothioxanthone, benzoin ethyl ether, diethoxyacetophenone, pt-butyltrichloroacetophenone, benzyldimethyl ketal, 2-hydroxy-2-methylpropylphenone, 1-hydroxycyclohexyl phenyl ketone, 2 -Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, dibenzosuberone and the like.

  The amount of the photopolymerization initiator used is preferably in the range of 0.001 to 10% by mass with respect to the total amount of the monomers, and 0.01 in order not to deteriorate the transparency of the precursor. It is more preferable to set it as -5 mass%.

The photopolymerizable composition 10 arranged in a thin film shape is irradiated with parallel light from an irradiation light source to polymerize the photopolymerizable composition 10, and a thin plate-like matrix 20 and a number of the matrix 20 arranged in the matrix 20 are used. A precursor 24 having a transparent columnar structure 22 is formed.
In the precursor 24, the matrix 20 and the columnar structure 22 are different in structure and density. Therefore, in the precursor 24, portions having different structures or densities (columnar structures 22) are dispersed in the matrix 20. It will have an arranged structure.

  The parallel light irradiation is preferably performed by placing a photomask between the irradiation light source and the photopolymerizable composition 10. The mask holes of the photomask are arranged corresponding to the arrangement of the columnar structures of the molded body 1.

  In addition to being able to irradiate parallel light, an irradiation light source is used whose light intensity distribution of parallel light is substantially constant in a cross section perpendicular to the traveling direction of the parallel light to be irradiated. Specifically, light from a point light source or a rod-shaped light source is converted into parallel light having a substantially uniform light intensity distribution (hat distribution) by a mirror or lens, or a planar light source such as a VCSEL is used. Can do. Since the columnar structure 4 is formed by growing in the traveling direction of parallel light, it is preferable that the spread angle (parallelism) of the parallel light is ± 0.03 rad or less. Laser light is a preferred light source in terms of parallelism, but its light intensity distribution has a Gaussian distribution, so that it can be used with a substantially uniform light intensity distribution using an appropriate filter or the like. preferable.

As the irradiation light source, the irradiation area is divided into a plurality of areas (for example, 9 areas), the light intensity of each area is measured, and the value of the illuminance distribution given by the following formula is 2.0% or less. ing. More preferably, 1.0% or less is used.
Illuminance distribution = (maximum value−minimum value) / (maximum value + minimum value) × 100

Preferably the irradiation intensity in the range of 0.01 to 100 mW / cm ^2, more preferably from 0.1~20mW / cm ^2. Illuminance without polymerization is completed at 0.01 mW / cm ² or less, the polymerization without columnar structures 22 If it is 100 mW / cm ² or more is formed will be completed.

  The polymerization of the photopolymerizable composition is preferably performed in an inert gas atmosphere in order to prevent polymerization inhibition by oxygen. Examples of the inert gas used include nitrogen, argon, helium, carbon dioxide and the like. However, the purpose of using the inert gas is to expel oxygen, and any gas can be used as long as it has a composition not containing oxygen.

Next, the precursor 24 is impregnated with the polymerizable composition to obtain a precursor 24 ′ impregnated with the polymerizable composition 26 (FIG. 3).
In the present embodiment, as a method for impregnating the polymerizable composition 26, there is a method in which the precursor 24 is immersed in the liquid polymerizable composition 26 and the polymerizable composition 26 is diffused in the precursor 24 until an equilibrium state is reached. Used.

  When the precursor 24 is continuously produced, a dipping tank containing the polymerizable composition is disposed downstream of the precursor 24 production apparatus, and the produced precursor is allowed to pass through the tank. Alternatively, a method of impregnating the polymerizable composition may be used.

  As the polymerizable composition 26 to be impregnated, monomers exemplified as the photopolymerizable composition 10 can be used. In addition, fine particles modified with a polymerizable functional group, inorganic materials, and the like can be used. The polymerizable composition 26 preferably has a high fluidity so that the precursor 24 is effectively impregnated. For this purpose, the above-described low molecular weight compound or the like may be mixed.

The polymerizable composition 26 may contain the above-described photopolymerization initiator, a thermal polymerization initiator such as benzoyl peroxide, azobisisobutyronitrile, or the like.
The amount of these initiators used is preferably in the range of 0.001 to 10% by mass with respect to the total amount of the polymerizable material, and 0.001 in order not to deteriorate the transparency of the molded body 1. It is more preferable to set it as -5 mass%.

  The precursor 24 ′ impregnated with the polymerizable composition 26 is made into the molded body 1 by polymerizing the polymerizable composition 26. At this time, the matrix 20 of the precursor 24 ′ impregnated with the polymerizable composition 26 becomes the matrix 2 of the molded body 1, and the columnar structure 22 of the precursor 24 ′ becomes the columnar structure 4 of the molded body 1.

  This polymerization is performed by light irradiation when the polymerizable composition 26 is a photopolymerizable composition like the photopolymerizable composition 10. Further, when the polymerizable composition 26 is a thermopolymerizable composition, this polymerization is performed by heat.

  The polymerization of the polymerizable composition 26 increases the volume distribution (density distribution) generated in the precursor 24, that is, the difference in density between the matrix and the columnar structure.

  At the time of impregnation, the polymerizable composition 26 is impregnated (nonuniformly) with a distribution inside the precursor 24 due to the composition or density distribution of the precursor 14. That is, the matrix 20 and the columnar structure are formed by the difference in the compatibility of the polymerizable composition 26 with the matrix 20 and the columnar structure 22 constituting the precursor 24 and the density difference between the matrix 20 and the columnar structure 22 constituting the precursor 24. In the structure 22, the amount of the polymerizable composition 26 penetrating is different. As a result, the volume distribution, that is, the density distribution (density difference) of the polymerizable composition 26 increases between the matrix 2 and the columnar structure 4 in the molded body 1 in which the polymerizable composition 26 is polymerized.

  Further, during the polymerization of the polymerizable composition, the polymerization proceeds at a high-density portion in the precursor while suppressing the diffusion of the polymerizable composition. Therefore, the polymerization is completed in a state where the molecular network is more complicated. In the density portion, polymerization proceeds while the composition is diffused, so the intermolecular network does not grow so much. As a result, the difference in the density of the polymerizable composition between the matrix 2 and the columnar structure 4 in the molded body 1 is emphasized, and a larger refractive index difference is obtained between the matrix 2 and the columnar structure 4.

  Since the volume distribution, that is, the density distribution (density difference) is caused by the diffusion of the polymerizable composition 26 at the time of polymerization, it is preferable to lower the polymerization rate in order to further enhance the volume distribution.

  The present invention is not limited to the above-described embodiment, and various changes and modifications can be made within the scope of the technical idea described in the claims.

Examples of the present invention will be described below.
The diffraction efficiency in this example was calculated according to the following formula, with a laser (wavelength: 532 nm) incident parallel to the columnar structure formed inside the film.
Diffraction efficiency (%) = scattered light intensity / total transmitted light intensity

(Example)
In a mixture of 60 parts by mass of polyethylene glycol dimethacrylate (trade name: NK ester 9G, manufactured by Shin-Nakamura Chemical Co., Ltd.) and 40 parts by mass of polyethylene glycol monomethacrylate (trade name: NK ester M-90G, manufactured by Shin-Nakamura Chemical Co., Ltd.) On the other hand, 1 part by mass of Irgacure 184 (manufactured by Ciba Specialty Chemicals) was added to obtain a photopolymerizable composition.

  A 0.3 mm silicon spacer was placed between the slide glass and the cover glass, and the photopolymerizable composition was sealed inside the spacer. Further, a photomask (4 μm holes patterned at 8 μm pitch) was placed on the cover glass, and irradiated with 10 mW / cm 2 parallel light from a high pressure mercury lamp for 5 minutes. Thereafter, the photomask was removed, and a precursor was prepared by further irradiating 10 mW / cm 2 of parallel light for 5 min.

  The diffraction efficiency of the precursor was measured and found to be about 11%.

  Subsequently, the precursor was impregnated with a polymerizable composition in which 1 part by mass of Irgacure 184 was added to 100 parts of benzyl methacrylate for 10 minutes. The weight of the precursor increased by about 1.5 times after impregnation / before impregnation, and it was confirmed that the precursor was impregnated with the polymerizable composition.

  The impregnated precursor was sandwiched between two slide glasses, and irradiated with 10 mW / cm 2 of ultraviolet light for 5 minutes to polymerize the polymerizable composition to obtain a molded body.

  The diffraction efficiency of the molded body thus obtained was measured and found to be about 70%. That is, by impregnating and polymerizing by the method of Example, the composition distribution was emphasized, and as a result, the diffraction efficiency could be improved.

(Comparative example)
48 parts by mass of polyethylene glycol dimethacrylate (trade name: NK ester 9G, manufactured by Shin-Nakamura Chemical Co., Ltd.) and 32 parts by mass of polyethylene glycol monomethacrylate (trade name: NK ester M-90G, manufactured by Shin-Nakamura Chemical Co., Ltd.), benzyl methacrylate 1 part by mass of Irgacure 184 (manufactured by Ciba Specialty Chemicals) was added to 20 parts of the mixture to obtain a photopolymerizable composition.

  A 0.3 mm silicon spacer was placed between the slide glass and the cover glass, and the photopolymerizable composition was sealed inside the spacer. Further, a photomask (4 μm holes patterned at 8 μm pitch) was placed on the cover glass, and irradiated with 10 mW / cm 2 parallel light from a high pressure mercury lamp for 5 minutes. Thereafter, the photomask was removed, and further a 10 mW / cm 2 parallel light was irradiated for 5 min to produce a molded body.

  When the diffraction efficiency of the molded product thus obtained was measured, it was about 17%, and a high diffraction efficiency was not obtained. That is, when the composition of the comparative example was used, the method of polymerizing with parallel light to generate a composition distribution could not generate a composition distribution sufficient to obtain high diffraction efficiency.

1: Molded body 2: Matrix 4: Columnar structure 10: Photopolymerizable composition 24: Precursor

Claims (5)

A method for producing a molded body comprising a thin plate-like transparent matrix and a plurality of transparent portions arranged in the matrix,
Impregnating a polymerizable composition with a precursor comprising a lamellar matrix and a plurality of parts dispersed in the matrix and having different composition or density;
Polymerizing the polymerizable composition, and
The manufacturing method of the molded object characterized by this. The precursor is made of a photopolymerizable composition, and the transparent portion is a plurality of columnar structures having a refractive index different from that of the matrix disposed in the matrix.
A method for producing a molded article according to claim 1 is provided. The polymerizable composition is a photopolymerizable composition;
The manufacturing method of the molded object of Claim 1 or 2. The polymerizable composition is a thermally polymerizable composition;
The manufacturing method of the molded object of Claim 1 or 2. A molded article comprising a cured product of a photopolymerizable composition and a polymerizable composition, comprising a thin plate-like matrix and a plurality of columnar structures disposed in the matrix,
The plurality of columnar structures have a refractive index different from that of the matrix, and are arranged in a lattice in an orientation extending in the thickness direction of the matrix in the matrix,
The columnar structure and the matrix have different densities of the polymerizable composition,
A molded product characterized by that.

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