JP7276655B2 - Resin cured body and manufacturing method of three-dimensional model - Google Patents

Description

The present invention relates to a method for producing a resin composition, a cured resin, and a three-dimensional object.

Conventionally, a method for obtaining a three-dimensional object by laminating resin materials or the like is known. For example, various methods such as stereolithography, powder bed fusion (PBF), and fused deposition modeling (FDM) have been proposed and put into practical use.

For example, stereolithography is widely used because it excels in detailed molding and accurate size expression. This method produces a three-dimensional object as follows. First, a modeling stage is provided in a tank filled with a liquid photocurable resin, and the photocurable resin on the modeling stage is irradiated with an ultraviolet laser to form a cured layer having a desired pattern. After one layer of the cured layer is formed in this manner, the modeling stage is lowered by one layer to introduce uncured resin onto the cured layer. After that, the UV laser is irradiated to the photocurable resin in the same manner to build up a new cured layer on the cured layer. By repeating this operation, a predetermined three-dimensional object is obtained.

In the powder bed fusion method (PBF), powder raw materials are laminated layer by layer, and the powder particles are melted and solidified by a laser or the like to produce a three-dimensional object. Specifically, a modeling stage is provided in a tank filled with powders of resin, metal, ceramics, glass, etc., and the powder on the modeling stage is irradiated with a semiconductor laser or an electron beam to soften and solidify the desired material. to prepare a cured layer of the pattern of After that, a new hardened layer is piled up on the hardened layer, and this operation is repeated to obtain a predetermined three-dimensional object.

In the hot melt lamination method, a fused material is extruded from a nozzle to form layers, and the layers are stacked to produce a three-dimensional object. For example, a filament formed by linearly molding a material containing a thermoplastic is used as a material, melted into a semi-liquid state by heat, and a single layer is produced while controlling the position of the nozzle with a computer. After that, a new hardened layer is piled up on the hardened layer, and this operation is repeated to obtain a predetermined three-dimensional object.

JP-A-7-26060 JP 2008-507619 A

In general, it has been pointed out that resin moldings made only of resin are inferior in mechanical strength and the like. Therefore, Patent Document 1 proposes adding an inorganic filler to a photocurable resin. Also in Patent Document 2, an inorganic filler is added as a filler to a thermoplastic material suitable for the hot melt lamination method.

By the way, the addition of an inorganic filler to a resin composition affects the transparency of the cured resin body to be obtained, not limited to the three-dimensional object as described above. In particular, when the resin cured product has transparency, the phenomenon described above is remarkable. In addition, in recent years, cured resins have come to be used not only in industrial products but also in fields where design is required. It's getting

An object of the present invention is to provide a method for producing a resin composition, a cured resin body, and a three-dimensional molded article that can produce a cured resin body with excellent design.

The resin composition of the present invention is a resin composition containing a light-transmitting resin and light-transmitting particles, wherein the light-transmitting particles contain two or more types of light-transmitting particles having different refractive indexes and Abbe numbers. It is characterized by

By doing so, the resin composition can contain two or more types of light-transmitting particles with different optical constants, so that two or more types of portions with different transparency are formed in the resulting cured resin body, It becomes easy to obtain a resin cured product excellent in design properties such as profound feeling and luxurious feeling. In addition, when the resin cured product is translucent, the color tone of the interior is likely to appear on the surface, so the coloring material to be added to the resin composition can be reduced.

In the present invention, the “translucent resin” means that the light transmittance of any wavelength in the visible range (300 to 800 nm) is 10% or more when a sample with a thickness of 0.5 mm is measured. means a resin of The term “translucent particles” means particles having a light transmittance of 10% or more at any wavelength in the visible region (300 to 800 nm) when a sample of 1 mm thickness is measured. Further, the “refractive index nd” is a value measured with respect to the d-line (587.6 nm) of a helium lamp, and the “Abbe number νd” is the refractive index of the d-line and the F-line (486.1 nm) of a hydrogen lamp. ) and C-line (656.3 nm), and calculated from Abbe number (νd)=[(nd−1)/(nF−nC)]. In the present invention, the refractive index and Abbe number of the translucent resin are values after curing.

In the resin composition of the present invention, the light-transmitting particles include first light-transmitting particles and second light-transmitting particles, and the difference in refractive index between the first light-transmitting particles and the light-transmitting resin is Δnd1|, the refractive index difference between the second light-transmitting particles and the light-transmitting resin |Δnd2|, the Abbe number difference between the first light-transmitting particles and the light-transmitting resin |Δνd1|, the second It is preferable that |Δnd1|<|Δnd2| and |Δνd1|<|Δνd2| be satisfied, where |Δνd2|

In this way, the refractive index difference and Abbe number difference between the translucent resin and the first translucent particles are the same as the refractive index difference and Abbe number difference between the translucent resin and the second translucent particles. It becomes easy to make them different, and it is possible to mix two or more types of parts with different transparency in the cured resin body. As a result, the appearance of the cured resin body can be imparted with design properties such as dignity and luxury.

The resin composition of the present invention has |Δnd1| Preferably.

By doing so, the transparency of the portion containing the first translucent particles can be easily increased in the cured resin body. On the other hand, the transparency of the portion containing the second translucent particles can be made lower than that of the portion containing the first translucent particles. |Δnd1| indicates the absolute value of Δnd1, and |Δnd2| indicates the absolute value of Δnd2. |Δνd1| indicates the absolute value of Δνd1, and |Δνd2| indicates the absolute value of Δνd2.

In the resin composition of the present invention, the translucent particles preferably contain any one of glass, crystals, and crystallized glass.

This makes it easy to design the optical constants of the light-transmitting particles, so that the difference between the optical constants of the light-transmitting particles and the light-transmitting resin can be easily controlled.

The resin composition of the present invention preferably has a maximum transmittance of 10% or more at 300 to 800 nm with a thickness of 1 mm of the translucent particles.

By doing so, the transparency of the cured resin can be enhanced. The transmittance is a value measured with a precision refractometer (KPR-2000 manufactured by Shimadzu Device Co., Ltd.) with both surfaces of a sample molded to a thickness of 0.5 mm having mirror surfaces.

In the resin composition of the present invention, the translucent particles preferably have an average particle diameter _D50 of 0.1 to 300 μm.

By doing so, it is possible to prevent the translucent particles from settling in the resin composition.

The resin composition of the present invention preferably contains 1 to 70 vol % of translucent particles.

By doing so, the mechanical strength of the cured resin can be enhanced.

In the resin composition of the present invention, the translucent resin preferably contains any one of a photocurable resin, a thermosetting resin and a thermoplastic resin.

The resin composition of the present invention is preferably used for three-dimensional modeling.

The cured resin body of the present invention is preferably a cured body of a resin composition.

The cured resin body of the present invention preferably has an L* value of 59 to 80 at a thickness of 0.5 mm and a maximum transmittance of 10 to 85% at 300 to 800 nm.

By regulating the L* value and transmittance of the cured resin, a desired cured resin can be easily obtained. The L* value was obtained by mirror-finishing both sides of a cured resin body with a thickness of 0.5 mm, and using a color difference meter (Juki JP7200F) with a light source of D65, a field of view of 10 degrees, and a measurement diameter of 10 mmφ. The transmittance is a value measured by installing a blackboard in the above, and the transmittance is the total light transmittance measurement of the above sample with a spectrophotometer (Shimadzu Corporation UV-3100), and the maximum transmittance at 300 to 800 nm is measured. is.

In the method for producing a three-dimensional object of the present invention, a precursor layer made of a resin composition is formed and cured to form a cured layer having a predetermined pattern, and a new precursor layer is formed on the cured layer. A method for manufacturing a three-dimensional object by curing to form a new cured layer having a predetermined pattern that is continuous with the cured layer, and repeating lamination of the cured layers until a predetermined three-dimensional object is obtained. , wherein the above resin composition is used as the resin composition.

In the method for producing a three-dimensional object of the present invention, a liquid layer made of a resin composition is selectively irradiated with an active energy ray to form a cured layer having a predetermined pattern, and a new liquid layer is formed on the cured layer. After forming, a new cured layer having a predetermined pattern is formed by irradiating the cured layer with an active energy ray, and the cured layer is repeatedly laminated until a predetermined three-dimensional object is obtained, thereby forming a three-dimensional object. In the manufacturing method, it is preferable to use the resin composition described above as the resin composition.

ADVANTAGE OF THE INVENTION According to this invention, it becomes easy to obtain the resin cured body excellent in design property, such as a solid feeling and a luxurious feeling.

The resin composition of the present invention contains at least a translucent resin, first translucent particles and second translucent particles.

First, the translucent resin will be described below. In the present invention, the “translucent resin” means that a resin molded to a thickness of 0.5 mm is “translucent”, that is, the light transmittance of any wavelength in the visible range (300 to 800 nm) is 10% or more. It means a resin, and does not necessarily have to be a highly transparent resin, such as an amorphous resin.

In addition, the translucent resin has a sample thickness of 0.5 mm and a light transmittance of 10% or more, preferably 20% or more, 30% or more, at any wavelength in the visible range (300 to 800 nm). 40% or more, 50% or more, 60% or more, 70% or more, 80% or more, 90% or more. Furthermore, it is desirable that the average transmittance in the visible region (300 to 800 nm) is 30% or more, 50% or more, particularly 70% or more. By doing so, the transparency of the cured resin is improved. In particular, when light-transmitting particles having different optical constants are mixed, differences in the light scattering at the interface between the light-transmitting resin and the light-transmitting particles are likely to occur, resulting in design properties such as dignity and luxury. It becomes easy to obtain an excellent cured resin.

The translucent resin may be a photocurable resin, a thermosetting resin, or a thermoplastic resin, and may be appropriately selected according to the molding method to be employed and the application of the cured resin. For example, if stereolithography is used, liquid photocurable resin should be selected, and if powder sintering is used, powdered thermosetting resin should be selected. do it. Thermoplastic resins can also be selected when using extrusion/injection molding or hot-melt lamination.

For example, as the photocurable resin, various resins such as polymerizable vinyl compounds and epoxy compounds can be selected. Further, monomers and oligomers of monofunctional compounds and polyfunctional compounds are used. These monofunctional compounds and polyfunctional compounds are not particularly limited. For example, typical photocurable resins are listed below, but the gist of the present invention is not limited to these.

Examples of monofunctional polymerizable vinyl compounds include isobornyl acrylate, isobornyl methacrylate, zinclopentenyl acrylate, bornyl acrylate, bornyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and propylene glycol. Acrylate, vinylpyrrolidone, acrylamide, vinyl acetate, styrene and the like. Examples of polyfunctional compounds include trimethylolpropane triacrylate, EO-modified trimethylolpropane triacrylate, ethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6 -hexanediol diacrylate, neopentyl glycol diacrylate, dicyclopentenyl diacrylate, polyester diacrylate, diallyl phthalate and the like. One or more of these monofunctional compounds and polyfunctional compounds can be used singly or in the form of a mixture.

As the polymerization initiator for the vinyl compound, a photopolymerization initiator and a thermal polymerization initiator are used. Photopolymerization initiators include 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenylketone, acetophenone, benzophenone, xanthone, fluorenone, bezaldehyde, fluorene, anthraquinone, triphenylamine, carbazole, and 3-methylacetophenone. , Michler's ketone and the like can be cited as typical examples, and these initiators can be used singly or in combination of two or more. A sensitizer such as an amine compound may also be used in combination, if necessary. Typical thermal polymerization initiators include benzoyl peroxide, t-butylperoxybenzoate, dicumyl peroxide, diisopropylperoxydicarbonate, t-butylperoxide, azobisisobutyronitrile, and the like. can be done. The amount of these polymerization initiators or thermal polymerization initiators to be used is preferably 0.1 to 10% by weight relative to the vinyl compound.

Examples of epoxy compounds include hydrogenated bisphenol A diglycidyl ether, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate, 2-(3,4-epoxycyclohexyl-5,5-spiro-3,4 -epoxy)cyclohexane-m-dioxane, bis(3,4-epoxycyclohexylmethyl)adipate and the like. When using these epoxy compounds, an energy active cationic initiator such as triphenylsulfonium hexafluoroantimonate can be used.

Furthermore, a leveling agent, a surfactant, an organic polymer compound, an organic plasticizer, etc. may be added to the liquid photocurable resin, if necessary.

Thermosetting resins include, for example, epoxy resins, thermosetting polyphenylene ether resins, thermosetting polyimide resins, urea resins, allyl resins, silicone resins, benzoxazine resins, phenol resins, unsaturated polyester resins, bismaleimide resins. Examples include triazine resins, modified maleimide resins, alkyd resins, furan resins, alkyd resins, melamine resins, polyurethane resins, aniline resins, guanamine resins, and the like.

Thermoplastic resins can be classified into general-purpose resins, engineering plastics, and super engineering plastics according to their properties such as heat resistance. For example, when heat resistance at a continuous use temperature of 100° C. or higher is required, engineering plastic is preferably used, and when heat resistance at a continuous use temperature of 150° C. or higher is required, super engineering plastic is preferably used.

Representative thermoplastic resins are listed below, but the present invention is not limited to these from the spirit of the present invention. Examples of thermoplastic resins include polyolefin resins, polyester resins, polyacrylate resins, polyoxymethylene resins, polyethylene resins, polypropylene resins, polystyrene resins, acrylonitrile-styrene resins, acrylonitrile-butadiene-styrene resins, and polyvinyl chloride resins. , polyvinyl acetate resin, polyvinyl alcohol resin, polyvinyl acetal resin, methacrylic resin, polyethylene terephthalate resin, and the like. Further, there are polyamide resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether resin, polyethylene terephthalate resin, polybutylene terephthalate resin, ultra-high molecular weight polyethylene resin, and the like. Furthermore, super engineering plastics include polyphenylene sulfide resins, polysulfone resins, polyimide resins, polyetherimide resins, polyesterimide resins, polyamideimide resins, polyarylate resins, polyethersulfone resins, polyetheretherketone resins, and liquid crystal polymers. There are resin, fluorine resin, and the like.

Representative examples of highly transparent resins include vinyl resins, polystyrene resins, acrylic resins, polyethylene terephthalate resins, polycarbonate resins, cellulose acetate resins, polyolefin resins, polysulfone resins, polyethersulfone resins, and polyetherimide resins. resins, polyarylate resins, and the like. When these resins are employed, the effects of the present invention can be obtained particularly efficiently.

In addition, the resin composition of the present invention contains various additive components such as antioxidants, nucleating agents, plasticizers, mold release agents, flame retardants, pigments, carbon black and the like, as long as the object of the present invention is not impaired. An appropriate amount of additives such as an antistatic agent may be contained. When the resin composition of the present invention is used, a translucent resin cured product is obtained, so that the color tone of the interior is likely to appear on the surface, and it is possible to reduce the amount of coloring material added to the resin composition.

Next, translucent particles will be described below.

The present invention includes two or more types of translucent particles having different refractive indices and Abbe numbers. When light-transmitting particles are mixed with a light-transmitting resin, light scattering occurs at the interface between them, and two or more types of portions with different transparency are formed in the resulting cured resin body. It becomes easy to obtain a resin cured product excellent in Therefore, it is more preferable that the translucent particles preferably have different refractive indexes and different Abbe numbers.

Moreover, the number of types of translucent particles is two or more, preferably three or more. In this way, the light scattering becomes more complicated, and it becomes easier to obtain a cured resin body excellent in design such as a feeling of solidity and luxury in the cured resin body to be obtained. On the other hand, if there are too many kinds of translucent particles, the light scattering in the resin composition becomes excessive, the transparency tends to be impaired, and it becomes difficult to obtain the desired appearance. Therefore, the number of types of translucent particles is preferably 10 or less, preferably 8 or less, 6 or less, 5 or less, and particularly preferably 4 or less. In particular, it is preferable to use two types of light-transmitting particles because the transparency and light scattering of the light-transmitting resin and the light-transmitting particles can be easily adjusted.

The translucent particles are not particularly limited as long as they are translucent in both material and shape. For example, the material preferably contains any one of glass, crystals, and crystallized glass. Crystals include, for example, SiO ₂ , Al ₂ O ₃ , MgO, β-quartz solid solution, and the like, and crystallized glass containing these alone or together with glass may be used. As for the shape, it is possible to use glass fillers such as glass beads, cylindrical or prismatic rods, glass powder, plate shapes, glass fibers, ceramic powders, ceramic fibers, etc. either singly or in combination. In particular, since glass beads are spherical, they are excellent in fluidity. Moreover, if it is manufactured by a method such as fire polishing, it is possible to finish the surface with a small surface roughness, and the fluidity can be further improved. Further, glass beads are characterized in that, compared with powdered glass produced by pulverization or the like, an increase in the viscosity of the translucent resin can be suppressed at the same addition amount.

The translucent particles include first translucent particles and second translucent particles. When the difference between the optical constants of the first light-transmitting particles and the second light-transmitting particles increases, two or more types of portions with different transparency tend to form in the resulting cured resin body, resulting in a sense of solidity and luxury. It becomes easy to obtain a resin cured product excellent in design. Therefore, it is preferable that the refractive index difference (|Δnd1|) between the first light-transmitting particles and the light-transmitting resin<the refractive index difference (|Δnd2|) between the second light-transmitting particles and the light-transmitting resin. . Moreover, the difference between |Δnd2| and |Δnd1| 07 or more, particularly preferably 0.1 or more. Further, it is preferable that the Abbe number difference between the first translucent particles and the translucent resin (|Δνd1|) < the Abbe number difference between the second translucent particles and the translucent resin (|Δνd2|). . The difference between Δνd2 and Δνd1 is preferably greater than 0, 0.05 or more, 0.1 or more, 0.2 or more, 0.3 or more, 0.5 or more, 1 or more, 2 or more, 3 or more, 5 or more, 7 10 or more is preferable, especially 10 or more.

On the other hand, when the difference between the optical constants of the first translucent particles and the second translucent particles is too large, the optical constants of the first translucent particles or the second translucent particles and the translucent resin There is a possibility that the difference in the optical constants of is too large, and the resin cured product becomes opaque. Therefore, the difference between |Δnd2| and |Δnd1| is preferably 0.5 or less, 0.4 or less, 0.3 or less, or 0.2 or less. The difference between |Δνd2| and |Δνd1| is preferably 20 or less, 15 or less, 13 or less, 12 or less, and particularly preferably 11 or less. In the present invention, any translucent particles contained in the resin composition may be selected as the first translucent particles and the second translucent particles. It suffices that the types of translucent particles satisfy the specified relationship.

Further, when focusing on the difference in optical constant between the first light-transmitting particles and the light-transmitting resin, the value of the refractive index difference (|Δnd1|) between the first light-transmitting particles and the light-transmitting resin is , preferably 0.025 or less, 0.02 or less, 0.01 or less, 0.0075 or less, or 0.005 or less. Further, the Abbe number difference (|Δνd1|) between the first translucent particles and the translucent resin is preferably 10 or less, 5.0 or less, 2.5 or less, 1.0 or less, or 0.5 or less. , is less than or equal to 0.3. By doing so, the optical constants of the first light-transmitting particles and the light-transmitting resin are easily matched, so that the transparency of the cured resin body to be obtained is improved. The light-transmitting particles whose optical constants are close to those of the light-transmitting resin can suppress scattering between the resin and the interface as the specific surface area decreases, and the transparency can be easily improved.

Further, when focusing on the difference in optical constant between the second light-transmitting particles and the light-transmitting resin, the refractive index difference (|Δnd2|) between the second light-transmitting particles and the light-transmitting resin is preferably is 0.005 or more, 0.0075 or more, 0.01 or more, 0.02 or more, 0.025 or more, or more than 0.025. Further, the Abbe number difference (|Δνd2|) between the second translucent particles and the translucent resin is preferably 0.1 or more, 0.2 or more, 0.3 or more, 0.5 or more, 1. 0 or more, 2.5 or more, 5.0 or more, 10 or more. In this way, it becomes difficult to match the optical constants of the translucent particles and the translucent resin, and light scattering tends to occur in the resulting cured resin. The light-transmitting particles whose optical constant differs from that of the light-transmitting resin have a smaller specific surface area, so scattering occurs at the interface with the light-transmitting resin, and opacity tends to occur.

When the first translucent particles and the second translucent particles are used in combination, it becomes easier to adjust the transparency and light scattering in the cured resin body. Furthermore, it is possible to mix two or more types of portions with different transparency in the cured resin body. As a result, it becomes easier to obtain a cured resin body having an appearance with excellent design properties such as a profound feeling and a luxurious feeling.

The translucent particles have a refractive index nd of 1.40 to 1.90, 1.40 to 1.65, 1.45 to 1.6, particularly 1.5 to 1.6, depending on the resin to be combined. It is preferably 1.55, and the Abbe's number νd is preferably 20-65, 40-65, 45-60, particularly preferably 50-55, depending on the resin to be combined. Furthermore, if the refractive index nd is 1.5 to 1.55 and the Abbe number νd is 50 to 55, the optical constants match many resins such as vinyl resins, epoxy resins, and ABS resins, making it suitable for a wide range of applications. Available. If the optical constant deviates from the above range, it becomes difficult to obtain an optical constant that matches the resin. The translucent particles have a light transmittance of 10% or more at any wavelength in the visible light range. It is desirable that the average transmittance is 30% or more, 50% or more, particularly 70% or more.

The translucent particles preferably have an average particle diameter _D50 of 0.1 to 300 μm, 1 to 200 μm, more than 1 to 200 μm, 1.5 to 150 μm, 2 to 100 μm, 3 to 50 μm, especially 4 to 40 μm. is preferred. The maximum particle size of the translucent particles is preferably 500 μm or less, particularly 300 μm or less, and the minimum particle size is preferably 0.1 μm or more, particularly 0.5 μm or more. The smaller the particle size of the light-transmitting particles, the higher the filling rate and the effect of increasing the viscosity of the resin composition. However, when stereolithography is used, the fluidity of the resin is lowered, and interfacial bubbles become difficult to escape. On the other hand, the larger the particle size of the translucent particles, the easier it is for the filling rate to decrease.

The translucent particles are made of glass having a thermal expansion coefficient of 20 to 100×10 ⁻⁷ /°C, 30 to 90×10 ⁻⁷ /°C, particularly 40 to 80×10 ⁻⁷ /°C at 30 to 100°C. is preferred. The lower the coefficient of thermal expansion of the filler, the less likely cracking and strength deterioration of the translucent particles and cured resin due to thermal shock occur. In addition, it is possible to obtain a resin cured product having a small shrinkage rate upon curing and high dimensional accuracy.

The translucent particles have a specific surface area of 0.1 to 5 m ² /g, 0.1 to 3.5 ^{m 2 /g} , 0.5 to 3.2 ^{m 2} /g, particularly 0.75 to 3 m ² /g. Preferably. If the specific surface area of the glass particles is too small, the diameter of the translucent particles becomes large, and the filling rate of the translucent particles in the resin composition tends to decrease. On the other hand, if the specific surface area of the translucent particles is too large, the resulting translucent particles also have a large specific surface area. It may become difficult to remove bubbles. In addition, the translucent particles are easily sedimented and separated in the resin composition. In order to suppress sedimentation separation of the light-transmitting particles in the resin composition, it is preferable to optimize the relationship between the specific surface area and the particle diameter of the light-transmitting particles and the surface roughness. For example, when the translucent particles have a large specific surface area, sedimentation and separation of the translucent particles can be suppressed by reducing the particle diameter, reducing the surface roughness of the particles, or making them spherical.

Moreover, the specific surface area of the translucent particles also affects the transparency of the cured resin. For example, in the case of light-transmitting particles whose optical constant is close to that of a light-transmitting resin, the smaller the specific surface area, the more the scattering between the resin and the interface can be suppressed, and the transparency can be easily improved. On the other hand, in the case of light-transmitting particles whose optical constant differs from that of the light-transmitting resin, the smaller the specific surface area, the more scattering occurs at the interface with the light-transmitting resin, and the more opaque.

Further, the density of the translucent particles is 2.2 to 7 g/cm ³ , 2.35 to 6.5 g/cm ³ , 2.5 to 6 g/cm ³ , particularly 2.6 to 5 g/cm ³ is preferred. If the density of the translucent particles is too low, the softening point tends to be unduly high. On the other hand, if the density of the light-transmitting particles is too high, the light-transmitting particles tend to sediment and separate in the resin composition. In order to suppress sedimentation separation of the translucent particles in the resin composition, it is preferable to optimize the relationship between the specific surface area and the density of the translucent particles. For example, sedimentation and separation of the translucent particles can be suppressed by increasing the specific surface area when the density of the translucent particles is high and decreasing the specific surface area when the density is low.

The total amount of translucent particles is preferably 1 to 70 vol%, more than 1 to 60 vol%, 5 to 50 vol%, 10 to 40 vol%, particularly preferably 15 to 30 vol%. If the content of the light-transmitting particles is too small, light scattering at the interface between the light-transmitting particles contained in the cured resin and the resin is difficult to occur, and it is difficult to enhance the design of the cured resin. In addition, the mechanical strength of the cured resin is likely to decrease. On the other hand, if the content of the translucent particles is too large, light scattering becomes excessive, and in addition to the transparency of the cured resin being likely to decrease, the mechanical strength tends to decrease.

When there are three or more kinds of translucent particles, the total amount (Vol%) of the first translucent particles and the second translucent particles/the total amount (Vol%) of all the translucent particles is preferably It is 0.5 or more, preferably 0.6 or more, 0.7 or more, 0.8 or more, and particularly preferably 0.9% or more. This makes it easier to adjust the transparency and light scattering of the light-transmitting resin and light-transmitting particles, and makes it easier to obtain a cured resin body having an appearance with excellent design properties such as dignity and luxury.

When the first translucent particles and the second translucent particles are used as the translucent particles, the ratio of the first translucent particles (Vol%)/the second translucent particles (Vol %) is preferably 0.1 to 10, preferably 0.2 to 8, 0.3 to 7, especially 0.4 to 6. In this way, among all the light-transmitting particles in the cured resin, the ratio of the first light-transmitting particles whose optical constant is particularly close to that of the light-transmitting resin can be regulated within a certain range. transparency and light scattering can be easily adjusted. Furthermore, since it is possible to mix two or more types of portions with different transparency in the cured resin body, it is possible to easily obtain a cured resin body having an appearance with excellent design properties such as dignity and luxury.

The translucent particles are preferably surface-treated with a silane coupling agent. Treatment with a silane coupling agent can increase the binding force between the light-transmitting particles and the light-transmitting resin, making it possible to obtain a cured resin body with more excellent mechanical strength. Furthermore, compatibility between the light-transmitting particles and the light-transmitting resin is improved, bubbles and voids at the interface are reduced, light scattering can be suppressed, and the transmittance is increased. Preferred examples of silane coupling agents include aminosilane, epoxysilane, and acrylsilane. The silane coupling agent may be appropriately selected depending on the resin used. For example, when a vinyl-based unsaturated compound is used as the photocurable resin, an acrylsilane-based silane coupling agent is most preferable, and when an epoxy-based compound is used. It is desirable to use an epoxysilane-based silane coupling agent for.

The composition of the translucent particles is not limited as long as it satisfies the above optical constants. For example, SiO ₂ —B ₂ O ₃ —R′ ₂ O (R′ is an alkali metal element) type glass, SiO ₂ —Al ₂ O ₃ —RO (R is an alkaline earth metal element) type glass, SiO ₂ —Al ₂ O ₃ -R' ₂ O-RO glass, SiO ₂ -Al ₂ O ₃ -B ₂ O ₃ -R' ₂ O glass, SiO ₂ -Al ₂ O ₃ -B ₂ O ₃ -R' ₂ O- RO glass, SiO ₂ —R′ ₂ O glass, SiO ₂ —R′ ₂ O—RO glass, etc. can be used.

In order to suppress coloration, the translucent particles should have a total content of Fe ₂ O ₃ , NiO, Cr ₂ O ₃ and CuO in the glass composition of 1% by mass or less and 0.75% by mass or less. , particularly preferably 0.5% by mass or less.

The total content of La ₂ O ₃ , Gd ₂ O ₃ and Bi ₂ O ₃ in the glass composition is preferably 20% by mass or less, 15% by mass or less, particularly 10% by mass or less. If the ranges of these components are limited as described above, coloring of the translucent particles can be easily suppressed and an increase in refractive index can be suppressed, so that a colorless and transparent cured resin can be easily obtained.

For environmental reasons, the total content of lead, antimony, arsenic, chlorine, and sulfur in the glass composition is preferably 1% by mass or less, 0.5% by mass or less, and particularly 0.1% by mass or less. preferable.

A specific composition range of the translucent particles is, for example, SiO ₂ 20 to 80%, Al ₂ O ₃ 0 to 30%, B ₂ O ₃ 0 to 50%, CaO 0 to 25%, and Na ₂ in mass %. O 0-30%, K ₂ O 0-30%, Li ₂ O 0-10%, TiO ₂ 0-15%, Nb ₂ O ₅ 0-20%, WO ₃ 0-20%, F 0-10% It preferably contains. When it is desired to improve the transparency, it is important to match the optical constants of the translucent particles with the optical constants of the resin to be combined.

For example, acrylic resin has a refractive index nd of about 1.4 to 1.6 and an Abbe number νd of about 45 to 65. As a glass capable of obtaining an optical constant matching this, for example, SiO ₂ is 50 to 50% by mass. 80%, _{Al2O3 0-30} %, _{B2O3 0-50} %, CaO 0-25%, _Na2O 0-30%, _K2O 0-30%, _Li2O 0-10% , TiO ₂ 0-15%, Nb ₂ O ₅ 0-20%, WO ₃ 0-20%, F 0-10%. The glass having the above composition range generally has a refractive index nd of 1.4 to 1.6 and an Abbe number νd of 45 to 65, and can be combined with an acrylic resin to obtain a transparent cured resin.

The reason for limiting the composition range as described above is as follows. In the following description, "%" means % by mass unless otherwise specified.

_SiO2 is a component that forms the glass skeleton. Further, it is a component capable of improving chemical durability and suppressing devitrification. SiO ₂ is desirably 50-80%, 55-75%, especially 60-70%. Too much _SiO2 tends to lower the meltability. In addition, it is difficult to soften during molding, and there is a possibility that manufacturing becomes difficult.

Al ₂ O ₃ is a vitrification stabilizing component. Further, it is a component capable of improving chemical durability and suppressing devitrification. Al ₂ O ₃ is desirably 0-30%, 2.5-25%, especially 5-20%. Too much Al ₂ O ₃ tends to lower the meltability. In addition, it is difficult to soften during molding, and there is a possibility that manufacturing becomes difficult.

B ₂ O ₃ is a component that forms a glass skeleton. Further, it is a component capable of improving chemical durability and suppressing devitrification. B ₂ O ₃ is desirably 0-50%, 2.5-40%, especially 5-30%. Too much B ₂ O ₃ tends to lower the meltability. In addition, it is difficult to soften during molding, and there is a possibility that manufacturing becomes difficult.

CaO is an alkaline earth element and is a component that stabilizes as an intermediate substance in glass, improves meltability, and facilitates softening of glass during molding. CaO is desirably 0-25%, 0.5-20%, especially 1-15%. If there is too much CaO, the chemical durability tends to decrease, and the glass tends to devitrify, which may make production difficult.

In addition to CaO, MgO, SrO, BaO and ZnO may be contained. The total amount of MgO, SrO, BaO and ZnO is preferably 0.1 to 50% by mass, 1 to 40%, especially 2 to 30%. These components, like CaO, tend to reduce the viscosity of the glass without significantly deteriorating the durability of the glass. On the other hand, if these components are too much, the viscosity of the glass increases and the glass tends to devitrify, which may make production difficult.

Na ₂ O is a component that reduces the viscosity of glass and suppresses devitrification. Na ₂ O is desirably 0-30%, 0.1-25%, 0.5-20%, especially 1-15%. If there is too much Na ₂ O, the chemical durability tends to decrease, and the glass tends to devitrify, which may make the production difficult.

K ₂ O is a component that reduces the viscosity of glass and suppresses devitrification. K ₂ O is desirably 0-30%, 0.1-25%, 0.5-20%, especially 1-15%. If the K ₂ O content is too high, the chemical durability tends to decrease, and the glass tends to devitrify, which may make production difficult.

Li ₂ O is a component that reduces the viscosity of glass and suppresses devitrification. Li ₂ O is desirably 0-10%, 0.1-9%, 0.5-7%, especially 1-5%. If the amount of Li ₂ O is too large, the chemical durability tends to decrease, and the glass tends to devitrify, which may make production difficult.

TiO ₂ is a component that can adjust the refractive index and Abbe's number, and is a component that reduces the viscosity of the glass. It is also a component that improves chemical durability. TiO ₂ is desirably 0-15%, 0.1-12%, 0.5-10%, especially 1-5%. Too much TiO ₂ tends to increase the refractive index and decrease the Abbe number. Also, the glass tends to be colored.

Nb ₂ O ₅ is a component that can adjust the refractive index and Abbe number. It is also a component that improves chemical durability. Nb ₂ O ₅ is desirably 0-20%, 0.1-15%, 0.5-10%, especially 1-5%. Too much Nb ₂ O ₅ increases the refractive index and decreases the Abbe number. Furthermore, the glass becomes more likely to devitrify.

_WO3 is a component that can adjust the refractive index and Abbe number, and is a component that reduces the viscosity of the glass. WO ₃ is desirably 0-20%, 0.1-15%, 0.5-10%, especially 1-5%. Too much _WO3 increases the refractive index and decreases the Abbe number. Further, the glass tends to be easily colored.

Further, the total content of TiO ₂ , Nb ₂ O ₅ and WO ₃ in the glass composition is desirably 0 to 30%, 0.1 to 25%, 1 to 20%, particularly 3 to 15%. . By limiting the ranges of these components as described above, it becomes easier to adjust the refractive index and Abbe number, and to suppress devitrification of the glass. Moreover, it becomes easy to obtain glass with high chemical durability.

The total content of Nb ₂ O ₅ and WO ₃ in the glass composition is desirably 0 to 30%, 0.1 to 25%, 1 to 20%, particularly 2 to 10%. If the ranges of these components are limited as described above, it becomes easier to adjust the refractive index and Abbe number, and it becomes less likely to be colored. In addition, devitrification of the glass can be easily suppressed. Furthermore, it becomes easy to obtain glass with high chemical durability.

F is a component that forms a glass skeleton. Further, it is a component capable of increasing the transmittance, particularly the transmittance in the ultraviolet region. F is desirably 0-10%, 0.1-7.5%, 0.5-5%, especially 1-3%. Too much F tends to lower the refractive index and increase the Abbe number. Moreover, chemical durability tends to deteriorate. Furthermore, F has high volatility, and there is a possibility that, for example, components sublimated during glass bead production may adhere to the glass surface and deteriorate the surface properties.

The epoxy resin has a refractive index nd of 1.5 to 1.8 and an Abbe number νd of 20 to 55. As a glass that can obtain optical constants matching these, for example, SiO ₂ is 20 to 70% by mass. , _{Al2O3 0-30} %, _{B2O3 0-50} %, CaO 0-25%, _Na2O 0-10%, _K2O 0-10%, _Li2O 0-10%, TiO ₂ 0-15%, Nb ₂ O ₅ 0-20%, WO ₃ 0-20%, F 0-10%. The glass having the above composition range generally has a refractive index nd of 1.5 to 1.8 and an Abbe number νd of 20 to 55, and can be combined with an epoxy resin to obtain a transparent cured resin.

The reason for limiting the composition range as described above is as follows.

_SiO2 is a component that forms the glass skeleton. Further, it is a component capable of improving chemical durability and suppressing devitrification. SiO ₂ is desirably 20-70%, 30-65%, especially 40-60%. If the amount of SiO ₂ is too large, the meltability tends to decrease, and softening during molding becomes difficult, which may make production difficult.

Al ₂ O ₃ is a vitrification stabilizing component. Further, it is a component capable of improving chemical durability and suppressing devitrification. Al ₂ O ₃ is desirably 0-30%, 2.5-25%, especially 5-20%. Too much Al ₂ O ₃ tends to lower the meltability. In addition, it is difficult to soften during molding, and there is a possibility that manufacturing becomes difficult.

B ₂ O ₃ is a component that forms a glass skeleton. Further, it is a component capable of improving chemical durability and suppressing devitrification. B ₂ O ₃ is desirably 0-50%, 2.5-40%, especially 5-30%. If the amount of B ₂ O ₃ is too large, the meltability tends to decrease, and softening during molding becomes difficult, which may make production difficult.

CaO is a component that stabilizes as an intermediate substance in glass, improves meltability, and facilitates softening of glass during molding. CaO is desirably 0-25%, 0.5-20%, especially 1-15%. If there is too much CaO, the chemical durability tends to decrease, and the glass tends to devitrify, which may make production difficult.

In addition to CaO, MgO, SrO, BaO and ZnO may be contained. The total amount of MgO, SrO, BaO and ZnO is preferably 0.1-50%, 1.0-40%, especially 2-30%. These components, like CaO, tend to reduce the viscosity of the glass without significantly deteriorating the durability of the glass. On the other hand, if these components are too much, the glass tends to devitrify, which may make the production difficult.

Na ₂ O is a component that reduces the viscosity of glass and suppresses devitrification. Na ₂ O is desirably 0-10%, 0.1-7.5%, 0.5-5%, especially 1-2.5%. If there is too much Na ₂ O, the chemical durability tends to decrease, and the glass tends to devitrify, which may make the production difficult.

K ₂ O is a component that reduces the viscosity of glass and suppresses devitrification. K ₂ O is desirably 0-10%, 0.1-7.5%, 0.5-5%, especially 1-2.5%. If the K ₂ O content is too high, the chemical durability tends to decrease, and the glass tends to devitrify, which may make production difficult.

Li ₂ O is a component that reduces the viscosity of glass and suppresses devitrification. Li ₂ O is desirably 0-10%, 0.1-9%, 0.5-7%, especially 1-5%. If the amount of Li ₂ O is too large, the chemical durability tends to decrease, and the glass tends to devitrify, which may make production difficult.

The total content of Na ₂ O, K ₂ O and Li ₂ O in the glass composition should be 10% or less, 7.5% or less, 5% or less, 2.5% or less, especially 1% or less. is preferred. By limiting the total amount of these components as described above, it becomes easier to suppress the evaporation of the alkali components in the glass that occur during the curing of the resin. In addition, since deterioration of chemical durability can be suppressed, deterioration of the epoxy resin due to, for example, alkali elution can be suppressed. Therefore, it is possible to easily obtain a colorless and transparent resin cured product, and to prevent deterioration over time of the obtained resin cured product. Furthermore, since the coefficient of thermal expansion of the glass can be reduced, thermal shock and thermal contraction during curing can be suppressed.

TiO ₂ is a component that can adjust the refractive index and Abbe number, and is a component that reduces the viscosity of the glass. It is also a component that improves chemical durability. TiO ₂ is desirably 0-15%, 0.1-12%, 0.5-10%, especially 1-5%. Too much TiO ₂ tends to increase the refractive index and decrease the Abbe number. In addition, the glass tends to be colored.

Nb ₂ O ₅ is a component that can adjust the refractive index and Abbe number. Nb ₂ O ₅ is desirably 0-20%, 0.1-15%, 0.5-10%, especially 1-5%. Too much Nb ₂ O ₅ tends to increase the refractive index and decrease the Abbe number. Furthermore, the glass becomes more likely to devitrify.

_WO3 is a component that can adjust the refractive index and Abbe number, and is a component that reduces the viscosity of the glass. WO ₃ is desirably 0-20%, 0.1-15%, 0.5-10%, especially 1-5%. Too much _WO3 tends to increase the refractive index and decrease the Abbe number. Further, the glass tends to be easily colored.

The total content of TiO ₂ , Nb ₂ O ₅ and WO ₃ in the glass composition is desirably 0-30%, 0.1-25%, 1-20%, especially 3-15%. By limiting the ranges of these components as described above, it becomes easier to adjust the refractive index and Abbe number, and to suppress devitrification of the glass. Furthermore, it becomes easy to obtain glass with high chemical durability.

The total content of Nb ₂ O ₅ and WO ₃ in the glass composition is desirably 0 to 30%, 0.1 to 25%, 1 to 20%, particularly 2 to 15%. If the ranges of these components are limited as described above, it becomes easier to adjust the refractive index and Abbe number, and it becomes less likely to be colored. In addition, devitrification of the glass can be easily suppressed. Furthermore, it becomes easy to obtain glass with high chemical durability.

F is a component that forms a glass skeleton. It is also a component that can increase the transmittance, particularly the transmittance in the ultraviolet region. F is desirably 0-10%, 0.1-7.5%, 0.5-5%, especially 1-3%. Too much F tends to lower the refractive index and increase the Abbe's number. Moreover, chemical durability tends to deteriorate. Furthermore, F has high volatility, and there is a possibility that the component sublimated during the production of glass beads may adhere to the glass surface and deteriorate the surface properties.

Furthermore, the resin composition of the present invention may contain nanofillers, which are particles smaller than the wavelength of visible light, in addition to the translucent particles. Since the nanofiller has the effect of increasing the viscosity, it is possible to adjust the viscosity of the resin composition to any desired value. ZrO ₂ , Al ₂ O ₃ , SiO ₂ and the like can be used as nanofillers. Since the nanofiller is a particle having a wavelength of visible light or smaller, it generally does not scatter light and does not easily affect the transparency and whiteness of the cured resin.

The nanofillers preferably have an average particle size D ₅₀ of 0.001 to 0.3 μm, 0.002 to 0.2 μm, 0.003 to 0.1 μm, 0.003 to 0.07 μm, 0.005 ~0.05 μm, particularly preferably 0.005 to 0.03 μm. If the average particle size _D50 of the nanofillers is too small, the material costs will be high. In addition, there is a possibility that the fluidity of the resin may be lowered, or that interfacial bubbles may become difficult to escape. On the other hand, if the average particle size _D50 of the nanofiller is too large, it becomes difficult to obtain the effect of increasing the viscosity of the resin.

Nanofillers have the effect of increasing the viscosity of the resin composition. The content of nanofillers is preferably 0-3 Vol %, 0.01-2 Vol %, 0.1-1 Vol %, 0.2-1 Vol %. If the content of the nanofiller is too high, the material cost will increase, and there is a risk that the viscosity of the resin will increase too much. In addition, there is a possibility that the fluidity of the resin may be lowered, or that interfacial bubbles may become difficult to escape.

The resin composition of the present invention can be used for stereolithography, specifically stereolithography, powder sintering, fused deposition modeling (FDM), and any other molding method such as extrusion injection molding. be. For example, it can be molded into a sheet shape or an arbitrary component shape and used for electronic component applications, consumer applications, and the like. In addition, since the resin composition of the present invention can obtain a translucent resin cured product with excellent design, it can be used, for example, in natural teeth having two layers of highly transparent enamel and opaque dentin. It is possible to obtain a resin cured body similar to the above. Therefore, the resin composition of the present invention can be used as a dental material, for example, as a paste as a therapeutic resin, or as a temporary tooth or mouthpiece.

Next, the cured resin body of the present invention will be described.

The cured resin body of the present invention preferably has an L* value of 59 to 80, more preferably 60 to 78, 61 to 77, 62 to 73, particularly 64 to 72, when the thickness is 0.5 mm. Also, the maximum transmittance at 300 to 800 nm is preferably 10 to 85, more preferably 15 to 80, 20 to 75, 30 to 70, especially 40 to 65. With respect to L* value and transmittance, in general, materials with high transparency tend to have low whiteness and high transmittance when the color tone of the material is the same. Also, materials with low transparency tend to have high whiteness and low transmittance. Since the cured resin body of the present invention has an L* value and a maximum transmittance at 300 to 800 nm in an appropriate range, it exhibits moderate transparency and is excellent in design such as a sense of solidity and luxury. can do. Furthermore, since the cured resin body of the present invention is semi-transparent and the color tone of the interior is likely to appear on the surface, it is possible to reduce the amount of coloring material added to the resin composition.

For example, the cured resin body of the present invention can be a cured resin body similar to a natural tooth having two layers of highly transparent enamel and opaque dentin. Therefore, the cured resin body of the present invention can be suitably used as dental materials such as temporary teeth and mouthpieces.

Next, as an example of the method for producing a three-dimensional object according to the present invention, a stereolithography method will be used for explanation. The resin composition is as described above, and the description is omitted here.

First, a single liquid layer made of a photocurable resin composition is prepared. For example, a modeling stage is provided in a tank filled with a liquid photocurable resin composition, and positioned so that the upper surface of the stage is at a desired depth (for example, about 0.2 mm) from the liquid surface. By doing so, a liquid layer having a thickness of about 0.1 to 0.2 mm can be prepared on the stage.

Next, this liquid layer is irradiated with an active energy beam such as an ultraviolet laser to cure the photocurable resin, thereby forming a cured layer having a predetermined pattern. In addition to ultraviolet rays, laser light such as visible rays and infrared rays can be used as the active energy rays.

Subsequently, a new liquid layer made of a photocurable resin composition is prepared on the formed cured layer. For example, by lowering the modeling stage by one layer, the photocurable resin can be introduced onto the cured layer to prepare a new liquid layer.

Thereafter, a new liquid layer prepared on the cured layer is irradiated with an active energy ray to form a new cured layer continuous with the cured layer.

Thereafter, at least a portion of the surface of the resulting three-dimensional object may be machined, if desired.

The present invention will be described below based on examples.

First, glass fillers A, B, and C were produced as translucent particles in the following manner. Raw materials prepared so as to have the composition shown in Table 2 were melted and then pulverized to prepare powdered glass having an average particle size of 8 μm. This powder was applied to the frame of an oxygen burner and formed into a spherical shape. Then, glass fillers A, B, and C having an average particle size of 8 μm were obtained by classification. As the nanofiller, a nanofiller (Aerosil RX200) having an average particle size of 0.007 μm was used.

The refractive index nd and Abbe number νd of the obtained glass filler were measured with a precision refractometer (KPR-2000 manufactured by Shimadzu Device Co., Ltd.).

Next, an acrylic photocurable resin was prepared as a translucent resin.

First, isophorone diisocyanate, morpholine acrylamide and dibutyltin dilaurate were heated in an oil bath. A liquid obtained by uniformly mixing and dissolving methylhydroquinone in glycerin monomethacrylate monoacrylate was added and mixed with stirring to cause a reaction. Next, a 4 mol propylene oxide adduct of pentaerythritol (1 mol each of propylene oxide added to each of the four hydroxyl groups of pentaerythritol) is added and reacted to produce a reaction product containing a urethane acrylate oligomer and morpholine acrylamide. manufactured.

Morpholine acrylamide and dicyclopentanyl diacrylate were added to the resulting reaction product containing the urethane acrylate oligomer and morpholine acrylamide. Further, 1-hydroxycyclohexylphenyl ketone (photopolymerization initiator) was added to obtain a colorless and transparent acrylic photocurable resin. This acrylic photocurable resin had a viscosity of 500 Pa·s, a refractive index nd of 1.515, and an Abbe number νd of 51.2.

The refractive index nd and Abbe's number νd were measured with a precision refractometer (KPR-2000 manufactured by Shimadzu Device Co., Ltd.).

Subsequently, glass fillers A to C were added to the acrylic photocurable resin at the ratios shown in Table 2, and the mixture was kneaded with three rollers to obtain a paste-like resin in which the glass fillers were uniformly dispersed. This paste-like resin was poured into a mold made of Teflon (registered trademark) having an inner dimension of 30 mm square. After that, it was cured by irradiation with light of 500 mW and a wavelength of 364 nm, and cured at 80° C. to obtain a cured resin body.

Table 2 shows examples (Nos. 1 to 8) and comparative examples (Nos. 9 and 10) of the present invention.

The viscosity of the translucent resin was measured with a Brookfield viscometer (DV-3).

The L* value was obtained by mirror-finishing both sides of a cured resin body with a thickness of 0.5 mm and using a color difference meter (Juki JP7200F) with a light source of D65, a field of view of 10 degrees, and a measurement diameter of 10 mmφ. was installed and measured.

For the transmittance, a sample of the cured resin was subjected to total light transmittance measurement using a spectrophotometer (UV-3100 manufactured by Shimadzu Corporation), and the maximum transmittance was measured at 300 to 800 nm.

As can be seen from Table 2, in the cured resin body using two types of glass filler, two types of portions with different transparency are mixed in the cured resin body, and the appearance is translucent, and the appearance is solid and luxurious. It was excellent in designability such as. On the other hand, Comparative Example 9, in which only the glass filler A having an optical constant similar to that of the translucent resin was added, had high transparency. The transparency was lowered, and none of them could be said to have high designability. As for the viscosity of the resin composition, it was possible to increase the viscosity of the translucent resin to an appropriate value by adding a glass filler. In particular, the addition of a small amount of nanofiller was highly effective in increasing the viscosity of the resin composition without lowering the L* value or transmittance.

The resin composition of the present invention can be suitably used for stereolithography, particularly for stereolithography such as stereolithography, powder sintering, and fused deposition modeling (FDM). Furthermore, the resin composition of the present invention can be suitably used as a dental material, for example, as a paste as a therapeutic resin, or as a temporary tooth or mouthpiece.

Claims (7)

A cured resin body containing a translucent resin and translucent particles,
The light-transmitting particles include two or more types of light-transmitting particles having different refractive indices and Abbe numbers,
The light-transmitting particles include first light-transmitting particles and second light-transmitting particles,
The refractive index difference between the first translucent particles and the translucent resin is |Δnd1|, the refractive index difference between the second translucent particles and the translucent resin is |Δnd2|,
Furthermore, when the Abbe number difference between the first light-transmitting particles and the light-transmitting resin is |Δνd1|, and the Abbe number difference between the second light-transmitting particles and the light-transmitting resin is |Δνd2|
|Δnd1|<|Δnd2| and |Δνd1|<|Δνd2|
|Δnd1| is 0.025 or less and |Δnd2| is greater than 0.025,
Further, |Δνd1| is 10 or less and |Δνd2| is 0.1 or more,
the translucent particles are glass,
A cured resin body having an L* value of 59 to 80 at a thickness of 0.5 mm and a maximum transmittance of 10 to 85% at a wavelength of 300 to 800 nm. 2. The cured resin body according to claim 1, wherein the translucent particles have an average particle diameter _D50 of 0.1 to 300 μm. 3. The cured resin body according to claim 1, which contains 1 to 70 vol % of translucent particles. 4. The cured resin body according to any one of claims 1 to 3 , wherein the translucent resin contains any one of a photocurable resin, a thermosetting resin and a thermoplastic resin. The cured resin body according to any one of claims 1 to 4 , wherein the cured resin body is used for three-dimensional modeling. A precursor layer made of a resin composition is formed and cured to form a cured resin layer having a predetermined pattern, and a new precursor layer is formed on the cured resin layer and cured to cure the resin. A method for manufacturing a three-dimensional object by forming a new cured resin layer having a predetermined pattern that is continuous with a body layer and repeating lamination of the cured resin layers until a predetermined three-dimensional object is obtained,
A method for producing a three- dimensional object , wherein the cured resin body according to any one of claims 1 to 5 is used as the cured resin body . A liquid layer made of a resin composition is selectively irradiated with an active energy ray to form a cured resin layer having a predetermined pattern, and after forming a new liquid layer on the cured resin layer , an active energy ray is applied. Manufacture a three-dimensional object by irradiating to form a new cured resin layer having a predetermined pattern that is continuous with the cured resin layer, and repeating lamination of the cured resin layers until a predetermined three-dimensional object is obtained. a method for
A method for producing a three- dimensional object , wherein the resin composition according to any one of claims 1 to 5 is used as the cured resin.