Sclerotic composition, fiber-containing resin molded body, and vehicle windshield

Abstract

To provide a resin composition which can improve a light transmissivity of a fiber-containing resin molding, a fiber-containing resin molding, and an article in .SOLUTION: Provided is a resin composition for forming a resin molding-containing a fiber 23, and containing (A) polyfunctional (meth)acrylate by 5 mass% or more and 90 mass% or less, and (B) monofunctional (meth)acrylate by 10 mass% or more and 95 mass% or less, and in which the total of component (A) and component (B) is 100 mass%, the refractive index difference between the fiber 23 and the resin composition is 0.10 or less and solvent is not contained.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a resin composition for forming a resin molded body containing fibers, Sclerosing composition a fiber-containing resin molded body formed from the above, Sclerosing composition and an article including the fiber-containing resin molded body.

Background Art

[0002] Resin products containing fibers such as glass fibers have excellent mechanical strength compared to resin products not containing fibers and can be made lighter compared to glass products. Therefore, for example, applications to many articles such as displays and solar panels have been proposed (see, for example, Patent Documents 1 to 4).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the other hand, the refractive index difference between the resin composition and the fiber causes light scattering in the fiber-containing resin molded body, making it difficult to apply the above-described fiber-containing resin molded body to articles that require high light transmittance, such as windows of moving bodies and sunroofs of vehicles. An object of the present invention is to provide a resin composition capable of improving the light transmittance of a fiber-containing resin molded body, a fiber-containing resin molded body, and an article.

Means for Solving the Problems

[0005] As a result of intensive studies, the present inventors have found that the above problems can be solved by a specific resin composition. That is, the resin composition for solving the above problems is a resin composition for forming a resin molded body containing fibers, and contains (A) a polyfunctional (meth) acrylate in an amount of 5% by mass or more and 90% by mass or less, and (B) a monofunctional (meth) acrylate in an amount of 10% by mass or more and 95% by mass or less. The total of component (A) and component (B) is 100% by mass. The refractive index difference between the fiber and the resin composition is 0.10 or less, and it does not contain a solvent. The fiber may include an inorganic glass fiber. Component (A) may include a polyfunctional (meth) acrylate having an aromatic ring. Component (A) may include a polyfunctional (meth) acrylate having a fluorene skeleton. Component (B) may include an (B1) N-substituted (meth) acrylamide compound. The fiber may be contained in the fiber-containing resin molded body in an amount of 5% by mass or more and 40% by mass or less. The fiber may include an inorganic glass fiber. The fiber-containing resin molded body for solving the above problems is formed using the above resin composition and contains fibers. An article for solving the above problems includes the above fiber-containing resin molded body.

Advantages of the Invention

[0006] The resin composition according to the present invention has a refractive index difference between the fiber and the resin composition of 0.10 or less and does not contain a solvent. Therefore, it is possible to suppress shrinkage during curing of the resin composition and improve the translucency of the fiber-containing resin molded body. The preferred resin composition according to the present invention can be applied to fibers with a high refractive index such as inorganic glass fibers, so that the mechanical strength of the fiber-containing resin molded body can be further improved. The fiber-containing resin molded body and the article according to the present invention are formed using the above resin composition, so that the translucency can be improved, and they are preferably used for articles that require high translucency such as windows of moving bodies.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0008] The term "resin" as described in this specification includes, in addition to indicating one type of resin, a resin mixture containing two or more resins, and a resin composition containing a resin and components other than the resin.

[0009] The term "lamination" as described in this specification includes, in addition to indicating directly stacking one layer and another layer in order, stacking with one or more other functional layers such as an anchor layer interposed between one layer and another layer.

[0010] The term "numerical value n or more" related to the numerical range described in this specification means the numerical value n or more than the numerical value n (n is a real number). For example, "20% or more" means 20% or more than 20%. The term "numerical value n or less" related to the numerical range described in this specification means the numerical value n or less than the numerical value n. For example, "20% or less" means 20% or less than 20%. The notation "numerical value n to numerical value m" related to the numerical range described in this specification means the numerical value n, more than the numerical value n and less than the numerical value m, or the numerical value m (m is a real number larger than n). For example, "10 to 90%" means 10%, more than 10% and less than 90%, or 90%.

[0011] Hereinafter, an embodiment of a resin composition, a fiber-containing resin molded article, and an article for forming the fiber-containing resin molded article will be described with reference to the drawings. [1. Resin Composition] The resin composition of the present invention is a resin composition for forming a resin molded body containing fibers. The resin composition contains (A) a polyfunctional (meth)acrylate and (B) a monofunctional (meth)acrylate. The resin composition of the present invention can be suitably used for forming a resin molded body containing fibers. The resin composition of the present invention has a refractive index difference between the resin composition and the fibers of 0.10 or less. The resin composition of the present invention does not contain a solvent.

[0012] The type of fiber is at least one selected from the group consisting of inorganic fibers, organic fibers, and inorganic-coated organic fibers. Inorganic fibers are, for example, mineral fibers such as glass fibers and basalt fibers, and ceramic fibers such as alumina fibers and silica fibers. Organic fibers are, for example, para-type aramid fibers, meta-type aramid fibers, polyarylate fibers, polyimide fibers, polyethylene fibers, polyparaphenylene benzobisoxazole fibers, polyparaphenylene terephthalamide fibers, polypropylene fibers, polybenzimidazole fibers, and cellulose fibers. From the viewpoint of enhancing the light transmittance of the fiber-containing resin molded body, the fibers contained in the fiber-containing resin molded body are preferably fibers composed of a transparent material. Fibers having high light transmittance are, for example, inorganic glass fibers.

[0013] The material constituting the inorganic glass fiber is, for example, non-alkali glass (E glass) having high insulation properties, alkali-containing glass (C glass) excellent in acid resistance, glass (S glass, T glass, etc.) having high strength and elastic modulus, glass (AR glass) excellent in alkali resistance, NE glass, etc. The inorganic glass fiber may be composed of one type of glass material, or may be composed of a combination of two or more types of glass fibers made of mutually different glass materials.

[0014] The surface of the inorganic glass fiber is preferably coated with a surface treatment agent such as an acrylic silane-based silane coupling agent. The surface treatment agent enhances the adhesive strength at the interface between the inorganic glass fiber and the resin composition and suppresses a decrease in light transmittance due to stress whitening or the like.

[0015] The shape of the fiber is, for example, a monofilament yarn that is a single continuous filament, a multifilament yarn composed of a plurality of continuous filaments, or a spun yarn containing short-fibered fibers. The form of the fiber is, for example, a form in which the fibers are dispersed in the resin composition with a random orientation, or a sheet form such as a non-woven fabric, a woven fabric such as plain weave or twill weave, or a mesh fabric.

[0016] From the viewpoint of enhancing the mechanical strength of the fiber-containing resin molded body, the blending ratio of the fiber is preferably 5% by mass or more, more preferably 8% by mass or more, based on 100% by mass of the fiber-containing resin molded body. From the viewpoint of enhancing the light transmittance of the fiber-containing resin molded body, the blending ratio of the fiber is preferably 40% by mass or less, more preferably 30% by mass or less, still more preferably 20% by mass or less, based on 100% by mass of the fiber-containing resin molded body.

[0017] In this specification, the refractive index of the fiber is measured under the conditions of the B method of JIS K7142:2014, that is, the Becke line method, except that the temperature is changed to 25°C, using the sodium D line with a wavelength of 589.3 nm and a mixed liquid of 1-bromonaphthalene and benzyl alcohol as the immersion liquid. When observing a fiber dispersed in a solvent with a known refractive index under a microscope, a Becke line, which is a bright line, can be observed on the interface between the fiber and the solvent. At this time, when the microscope tube is slightly moved upward to slightly shift the focus, the Becke line moves toward the side with a higher refractive index. Conversely, when the microscope tube is slightly moved downward to slightly shift the focus, the Becke line moves toward the side with a lower refractive index. The Becke line method determines the refractive index by repeating this operation while changing the solvent.

[0018] In this specification, the refractive index of the resin composition is measured under the conditions of the A method of JIS K7142:2014, except that the temperature is changed to 25°C, using the sodium D line with a wavelength of 589.3 nm and 1-bromonaphthalene as the contact liquid, with the completely cured resin composition as the measurement object. The refractive index difference Δn between the fiber and the resin composition is obtained from the following formula. Δn = |nF - nC| Here, nF is the refractive index of the fiber, and nC is the refractive index of the resin composition.

[0019] In the resin composition of the present invention, the refractive index difference between the resin composition and the fiber is 0.10 or less, preferably 0.05 or less, more preferably 0.01 or less, and still more preferably 0.005 or less. From the viewpoint of light transmittance, the smaller the refractive index difference between the resin composition and the fiber, the more preferable.

[0020] When the fiber-containing resin molded body is a film, a sheet, or a plate, in this specification, "having light transmittance" means that the visible light transmittance of the fiber-containing resin molded body is 70% or more, preferably 80% or more, more preferably 90% or more. In this specification, the visible light transmittance is a value measured in accordance with the visible light transmittance test of 6.4 of JIS A5759:2016, except that the fiber-containing resin molded body itself is measured without laminating it on a glass plate.

[0021] [1-1. Component (A)] (A) The polyfunctional (meth)acrylate is a (meth)acrylate having two or more (meth)acryloyl groups in one molecule. Component (A) acts to polymerize and cure by heat or active energy rays such as ultraviolet rays or electron beams to form a resin molded body. The polyfunctional (meth)acrylate may be used alone or in combination of two or more.

[0022] The polyfunctional (meth)acrylate is, for example, a bifunctional (meth)acrylate, a trifunctional or higher (meth)acrylate, (A1) a polyfunctional (meth)acrylate having an aromatic ring, and the like.

[0023] The difunctional (meth)acrylates include, for example, difunctional aliphatic (meth)acrylates such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, butylene glycol di(meth)acrylate, hexanediol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, polyethylene glycol - polypropylene glycol di(meth)acrylate; difunctional alicyclic (meth)acrylates such as cyclohexanedimethanol di(meth)acrylate, ethoxylated cyclohexanedimethanol di(meth)acrylate, propoxylated cyclohexanedimethanol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate; and difunctional heterocyclic (meth)acrylates such as ethoxylated isocyanuric acid di(meth)acrylate, propoxylated isocyanuric acid di(meth)acrylate, ethoxylated propoxylated isocyanuric acid di(meth)acrylate.

[0024] The trifunctional or higher functional (meth)acrylates include, for example, trifunctional or higher functional aliphatic (meth)acrylates such as glycerin tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, tetramethylolmethane tri(meth)acrylate, pentaerythritol tri(meth)acrylate; and trifunctional or higher functional heterocyclic (meth)acrylates such as ethoxylated isocyanuric acid tri(meth)acrylate, propoxylated isocyanuric acid tri(meth)acrylate, ethoxylated propoxylated isocyanuric acid tri(meth)acrylate.

[0025] Component (A1) is, for example, a bifunctional aromatic (meth)acrylate such as bisphenol A type diethoxydi(meth)acrylate, ethoxylated bisphenol A di(meth)acrylate, propoxylated bisphenol A type di(meth)acrylate, ethoxylated propoxylated bisphenol A type di(meth)acrylate, ethoxylated bisphenol AF type di(meth)acrylate, propoxylated bisphenol AF type di(meth)acrylate, ethoxylated propoxylated bisphenol AF type di(meth)acrylate, bisphenol A type epoxy di(meth)acrylate, bisphenol F type epoxy di(meth)acrylate, bisphenol AF type epoxy di(meth)acrylate; a bifunctional (meth)acrylate having a fluorene skeleton such as, for example, ethoxylated fluorene type di(meth)acrylate, propoxylated fluorene type di(meth)acrylate, ethoxylated propoxylated fluorene type di(meth)acrylate; a trifunctional aromatic (meth)acrylate such as, for example, phenol novolac type epoxy (meth)acrylate, cresol novolac type epoxy (meth)acrylate.

[0026] It is preferable to include component (A1) as component (A). With a configuration using component (A1), the heat resistance of the fiber-containing resin molded body can be improved. In particular, with a configuration using component (A1) having a fluorene skeleton such as 9,9-bis[4-(2-(meth)acryloyloxyethoxy)phenyl]fluorene, even when the fiber contained in the fiber-containing resin molded body is a fiber with a high refractive index such as an inorganic glass fiber, the refractive index difference Δn can be reduced to obtain the translucency of the fiber-containing resin molded body.

[0027] It is preferable to include, as component (A), a prepolymer having two or more (meth)acryloyl groups in one molecule as component (A2). With a configuration using component (A2), the tack of the fiber-containing resin molded body can be reduced. A prepolymer is an intermediate in which the polymerization or condensation reaction of a monomer is stopped at an intermediate stage, and the polymerization and crosslinking reactions are easily advanced by a curing agent. The mass average molecular weight Mw of the prepolymer is 1000 or more.

[0028] Component (A2) is, for example, prepolymers such as polyurethane (meth)acrylate, polyester (meth)acrylate, polyacrylic (meth)acrylate, polyepoxy (meth)acrylate, polyalkylene glycol poly(meth)acrylate, and polyether (meth)acrylate.

[0029] The weight average molecular weight Mw of component (A2) is a value in terms of polystyrene obtained from the differential molecular weight distribution curve (hereinafter sometimes abbreviated as GPC curve) measured by gel permeation chromatography (hereinafter sometimes referred to as GPC). From the viewpoint of reducing the tack of the fiber-containing resin molded body, the weight average molecular weight Mw of component (A2) is 1000 or more, preferably 2000 or more, more preferably 2500 or more. On the other hand, from the viewpoint of easily obtaining a viscosity that allows the resin composition of the present invention to be easily handled industrially despite not containing a solvent, the weight average molecular weight Mw of component (A2) is 10000 or less, preferably 7000 or less, more preferably 5000 or less.

[0030] For the GPC measurement system to obtain the weight-average molecular weight Mw, a high-performance liquid chromatography system "HLC-8320 (trade name)" (manufactured by Tosoh Corporation: a system including a degasser, a liquid delivery pump, an autosampler, a column oven, and an RI (differential refractive index) detector) was used. As GPC columns, two GPC columns "KF-806L (trade name)" manufactured by Shodex, one each of "KF-802 (trade name)" and "KF-801 (trade name)", a total of four columns, were connected in the order of KF-806L, KF-806L, KF-802, and KF-801 from the upstream side and used. As the mobile phase, tetrahydrofuran (excluding stabilizer) for high-performance liquid chromatography manufactured by Wako Pure Chemical Industries, Ltd. was used. The flow rate was 1.0 milliliter / minute, the column temperature was 40 °C, the sample concentration was 1 milligram / milliliter, and the sample injection volume was 100 microliters. The elution amount at each retention volume was determined from the detection amount of the RI detector on the assumption that there was no molecular weight dependence of the refractive index of the measurement sample. The calibration curve from the retention volume to the polystyrene-equivalent molecular weight was created using standard polystyrene "EasiCal PS-1 (trade name)" (molecular weights of Plain A: 6375000, 573000, 117000, 31500, 3480; molecular weights of Plain B: 2517000, 270600, 71800, 10750, 705) manufactured by Agilent Technology Co., Ltd. The analysis program "TOSOH HLC-8320GPC EcoSEC (trade name)" manufactured by Tosoh Corporation was used. For the theory and measurement of GPC, reference can be made to "Size Exclusion Chromatography, High-Performance Liquid Chromatography of Polymers, Author: Sadao Mori, First Edition, First Printing, December 10, 1991 (Kyoritsu Shuppan Co., Ltd.)" and "Synthetic Polymer Chromatography, Editors: Hajime Ohtani, Tatsuya Takasaki, First Edition, First Printing, July 25, 2013 (Ohmsha, Ltd.)".

[0031] Figure 1 shows the differential molecular weight distribution curve obtained by the above-described GPC measurement for urethane (meth) acrylate "EBECRYL 4100 (trade name)" (manufactured by Daicel Ornex Co., Ltd.), which is an example of component (A2).

[0032] As shown in Fig. 1, in the differential molecular weight distribution curve, a total of three sharp peaks were observed, and the polystyrene-equivalent molecular weights at the peak top positions were 620, 1800, and 3300 in order from the low molecular weight side. Also, a broad peak was observed on the low molecular weight side of the three peaks, and the polystyrene-equivalent molecular weight at the peak top position was 130. From this, the broad peak is presumed to be the peak of unreacted / residual monomer. Also, it was recognized that the polystyrene-equivalent molecular weight of the component on the highest molecular weight side was about 20,000. And the number average molecular weight of the whole was 1100, the mass average molecular weight Mw was 2800, and the Z average molecular weight Mz was 4900.

[0033] The number of (meth)acryloyl groups in component (A2) is preferably 3 or more, more preferably 6 or more, still more preferably 10 or more, from the viewpoint of enhancing the heat resistance of the fiber-containing resin molded body.

[0034] The blending ratio of component (A1) in component (A) is not particularly limited. The blending ratio of component (A1) in component (A) is 20% by mass or more, preferably 40% by mass or more, more preferably 60% by mass or more, from the viewpoints of enhancing the heat resistance and light transmittance of the fiber-containing resin molded body, with the total amount of component (A) being 100% by mass. On the other hand, the blending ratio of component (A1) in component (A) is 90% by mass or less, preferably 80% by mass or less, from the viewpoint of reducing the tack of the fiber-containing resin molded body.

[0035] The blending ratio of component (A2) in component (A) is not particularly limited. From the viewpoint of reducing the tack of the fiber-containing resin molded article, the blending ratio of component (A2) in component (A) is 10% by mass or more, preferably 20% by mass or more, more preferably 30% by mass or more, with the total amount of component (A) being 100% by mass. On the other hand, from the viewpoint of enhancing the light transmittance of the fiber-containing resin molded article, the blending ratio of component (A2) in component (A) is 90% by mass or less, preferably 80% by mass or less, more preferably 70% by mass or less, still more preferably 50% by mass or less. When a part of component (A1) can function as component (A2), the blending ratio of the said component (A2) is treated as the blending ratio of component (A1). That is, the blending ratio of component (A2) is the blending ratio of the component that can function as a prepolymer alone.

[0036] [1-2. Component (B)] (B) The monofunctional (meth)acrylate is a (meth)acrylate having one (meth)acryloyl group in one molecule. The monofunctional (meth)acrylate may be used alone or in combination of two or more.

[0037] The monofunctional (meth)acrylate includes, for example, monofunctional aliphatic (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate; hydroxyalkyl (meth)acrylates such as 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate; monofunctional alicyclic (meth)acrylates such as cyclohexyl (meth)acrylate, cyclopentyl (meth)acrylate, isobornyl (meth)acrylate; monofunctional heterocyclic (meth)acrylates such as 2-tetrahydrofurfuryl (meth)acrylate, N-(meth)acryloyloxyethylhexahydrophthalimide, 2-(meth)acryloyloxyethyl-N-carbazole; (B1) N-substituted (meth)acrylamide compounds; (B2) monofunctional (meth)acrylates having an aromatic ring; (B3) monofunctional (meth)acrylates containing an epoxy group, etc.

[0038] Component (B1) includes, for example, N-methyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-propyl (meth)acrylamide, N-isopropyl (meth)acrylamide, N-butyl (meth)acrylamide, N-isobutyl (meth)acrylamide, N-hexyl (meth)acrylamide, N-alkoxy (meth)acrylamide, (meth)acryloylmorpholine, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N-isopropyl (meth)acrylamide, N,N-dimethylaminopropyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-methyl-N-hydroxyethyl (meth)acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, N-(2-hydroxyethyl)acrylamide, N-(meth)acryloylmorpholine, allyl (meth)acrylamide, 2-ethylhexyl (meth)acrylamide, etc.

[0039] Component (B2) is, for example, benzyl (meth)acrylate, phenyl (meth)acrylate, naphthyl (meth)acrylate, phenoxyethyl (meth)acrylate, phenoxypropyl (meth)acrylate, naphthoxyethyl (meth)acrylate, phenoxypolyethylene glycol (meth)acrylate, nonylphenoxypolyethylene glycol (meth)acrylate, phenoxypolypropylene glycol (meth)acrylate, hydroxy-phenoxypropyl (meth)acrylate, etc.

[0040] Component (B3) is, for example, aliphatic epoxy (meth)acrylate such as glycidyl (meth)acrylate, β-methylglycidyl (meth)acrylate; alicyclic epoxy (meth)acrylate such as 3,4-epoxycyclohexylethyl (meth)acrylate, 3,4-epoxycyclohexylpropyl (meth)acrylate. Component (B3) is a (meth)acrylate obtained by modifying the epoxy group contained therein using a monofunctional (meth)acrylate containing these epoxy groups as a starting material, and a (meth)acrylate in which a part of the epoxy group remains unmodified can also be used.

[0041] From the viewpoint of enhancing the affinity with inorganic glass fibers, the epoxy index of component (B3) is 0.001 eq / Kg or more, preferably 0.01 eq / Kg or more, more preferably 0.1 eq / Kg or more. On the other hand, from the viewpoint of consuming all epoxy groups during the curing of the resin composition of the present invention, the epoxy index of component (B3) is 20 eq / Kg or less, preferably 10 eq / Kg or less, more preferably 5 eq / Kg or less. In this specification, the epoxy index is a value measured using a potentiometric titration apparatus conforming to JIS K7236:2001.

[0042] From the viewpoint of obtaining a viscosity that can be industrially easily handled even though the resin composition of the present invention does not contain a solvent, it is preferable to include component (B1) as component (B).

[0043] From the viewpoint of enhancing the heat resistance of the fiber-containing resin molded article, it is preferable to include component (B2) as component (B). In the configuration using component (B2), even when the fibers contained in the fiber-containing resin molded article are high refractive index fibers such as inorganic glass fibers, the refractive index difference Δn can be reduced to obtain the light transmittance of the fiber-containing resin molded article. When the fiber is an inorganic glass fiber, from the viewpoint of enhancing the affinity with the inorganic glass fiber, it is preferable to include component (B3) as component (B).

[0044] The blending ratio of component (B1) in component (B) is not particularly limited. In the resin composition of the present invention, despite not containing a solvent, from the viewpoint of easily obtaining a viscosity that can be industrially easily handled, the blending ratio of component (B1) in component (B) is 10% by mass or more, preferably 20% by mass or more, more preferably 25% by mass or more, with the total amount of component (B) being 100% by mass. On the other hand, from the viewpoint of reducing the tack of the fiber-containing resin molded article, the blending ratio of component (B1) in component (B) is 80% by mass or less, preferably 60% by mass or less, more preferably 40% by mass or less, with the total amount of component (B) being 100% by mass.

[0045] The blending ratio of component (B2) in component (B) is not particularly limited. From the viewpoints of enhancing the heat resistance and light transmittance of the fiber-containing resin molded article, the blending ratio of component (B2) in component (B) is 10% by mass or more, preferably 20% by mass or more, more preferably 25% by mass or more, with the total amount of component (B) being 100% by mass. On the other hand, from the viewpoint of reducing the tack of the fiber-containing resin molded article, the blending ratio of component (B2) in component (B) is 80% by mass or less, preferably 70% by mass or less, more preferably 60% by mass or less, with the total amount of component (B) being 100% by mass.

[0046] The blending ratio of component (B3) in component (B) is not particularly limited. When the fiber is an inorganic glass fiber, from the viewpoint of enhancing the affinity with the inorganic glass fiber, the blending ratio of component (B3) in component (B) is 10% by mass or more, preferably 20% by mass or more, more preferably 25% by mass or more, with the total amount of component (B) being 100% by mass. On the other hand, from the viewpoint of consuming all epoxy groups during the curing of the resin composition of the present invention, the blending ratio of component (B3) in component (B) is 80% by mass or less, preferably 60% by mass or less, more preferably 50% by mass or less, with the total amount of component (B) being 100% by mass.

[0047] In addition, when a part of component (B1) is a component having an aromatic ring, the blending ratio of the component is treated as the blending ratio of component (B1). When a part of component (B1) is a component containing an epoxy group, the blending ratio of the component is treated as the blending ratio of component (B1). When a part of component (B2) is a component containing an epoxy group, the blending ratio of the component is treated as the blending ratio of component (B2).

[0048] The blending ratio of component (A) and component (B) is appropriately selected from the viewpoints of reducing the tack of the fiber-containing resin molded body and obtaining a viscosity that can be easily handled industrially in the resin composition of the present invention, despite not containing a solvent, in terms of balance.

[0049] From the viewpoint of reducing the tack of the fiber-containing resin molded body, the blending ratio of component (A) and component (B) is such that component (A) is 5% by mass or more and component (B) is 95% by mass or less, with the total of component (A) and component (B) being 100% by mass. Preferably, component (A) is 10% by mass or more and component (B) is 90% by mass or less, more preferably, component (A) is 15% by mass or more and component (B) is 85% by mass or less, still more preferably, component (A) is 20% by mass or more and component (B) is 80% by mass or less.

[0050] On the one hand, in the resin composition of the present invention, from the viewpoint of easily obtaining a viscosity that can be industrially easily handled despite not containing a solvent, the blending ratio of component (A) and component (B) is such that, with the total of component (A) and component (B) being 100% by mass, component (B) is 10% by mass or more and component (A) is 90% by mass or less. Preferably, component (B) is 20% by mass or more and component (A) is 80% by mass or less, more preferably, component (B) is 30% by mass or more and component (A) is 70% by mass or less.

[0051] When the blending ratio of the fibers in the fiber-containing resin molded body is high, particularly when attempting to include the fibers in the fiber-containing resin molded body in the form of a nonwoven fabric or a woven fabric, etc., from the viewpoint of not damaging the nonwoven fabric or the woven fabric, the method for producing the fiber-containing resin molded body is to impregnate the nonwoven fabric or the woven fabric with the resin composition. Alternatively, a method of immersing the nonwoven fabric or the woven fabric in the resin composition and then curing the resin composition is preferred. On the other hand, if the resin composition used in the production method contains a solvent, the resin composition will shrink significantly during curing, and as a result, the cured product of the resin composition will peel off from the fibers at the interface between the fibers and the resin composition, reducing the light transmittance of the fiber-containing resin molded body or damaging the nonwoven fabric or the woven fabric. Therefore, the resin composition of the present invention is configured not to contain a solvent and solves the above problems.

[0052] Here, "not containing" a solvent means that it does not contain a significant amount of the solvent. In the field of resin compositions, particularly curable resin compositions, a significant amount of the solvent, from the viewpoint of making the viscosity of the resin composition such that it can be industrially easily handled, is about 10 parts by mass or more with the total of component (A) and component (B) being 100 parts by mass. That is, "not containing" a solvent can also be rephrased as, with the total of component (A) and component (B) being 100 parts by mass, the amount of the solvent is less than 10 parts by mass, preferably 5 parts by mass or less, more preferably 3 parts by mass, still more preferably 1 part by mass or less, even more preferably 0.5 part by mass or less, and most preferably 0.1 part by mass or less.

[0053] [1-3. Components (C), (D), (E)] From the perspective of reducing the tack of the fiber-containing resin molded article, the resin composition of the present invention preferably further contains (C) a compound having two or more secondary thiol groups in one molecule. Component (C) is, for example, pentaerythritol tetrakis(3-mercaptobutyrate), trimethylolpropane tris(3-mercaptobutyrate), trimethylolethane tris(3-mercaptobutyrate), etc.

[0054] The blending ratio of component (C) is an optional component and is not particularly limited. The blending ratio of component (C), based on 100 parts by mass in total of components (A) and (B), is 0.5 part by mass or more, preferably 1 part by mass or more, more preferably 1.5 part by mass or more from the viewpoint of surely obtaining the use effect of component (C). On the other hand, from the viewpoint of enhancing the rigidity of the fiber-containing resin molded article, the blending ratio of component (C), based on 100 parts by mass in total of components (A) and (B), is 20 parts by mass or less, preferably 15 parts by mass or less, more preferably 10 parts by mass or less.

[0055] When the fiber is an inorganic glass fiber, it is preferable to further include (D) a silane coupling agent in the resin composition of the present invention from the viewpoint of enhancing the affinity between the inorganic glass fiber and the resin composition. Component (D) is, for example, vinyl-based silane coupling agents such as vinyl ethoxysilane and vinyl methoxysilane; polymer-type silane coupling agents such as polyethoxydimethylsiloxane and polyethoxydimethylsiloxane; methacrylate-based silane coupling agents such as 3-(methacryloyloxy)propyltrimethoxysilane and 3-(methacryloyloxy)propylmethyldimethoxysilane, etc.

[0056] The blending ratio of component (D) is an optional component and is not particularly limited. Regarding the blending ratio of component (D), with the total of components (A) and (B) being 100 parts by mass, from the viewpoint of surely obtaining the usage effect of component (D), it is 0.5 part by mass or more, preferably 1 part by mass or more, more preferably 1.5 parts by mass or more. On the other hand, from the viewpoint of lengthening the pot life in the resin composition of the present invention, the blending ratio of component (D), with the total of components (A) and (B) being 100 parts by mass, is 10 parts by mass or less, preferably 7 parts by mass or less, more preferably 5 parts by mass or less.

[0057] When the fiber contained in the fiber-containing resin molded body is a fiber with a high refractive index such as an inorganic glass fiber, from the viewpoint of being able to reduce the refractive index difference Δn, it is preferable to further include (E) high refractive index fine particles in the resin composition of the present invention. Here, a high refractive index means that the refractive index is 1.5 or more, preferably 1.6 to 2.8. The high refractive index fine particles are, for example, inorganic fine particles, inorganic-coated organic fine particles, etc. The inorganic fine particles are zirconium-containing particles such as zirconium oxide fine particles, titanium-containing particles such as titanium oxide fine particles, niobium-containing particles, tin-containing particles, zinc-containing particles, aluminum-containing particles, silicon-containing particles, magnesium-containing particles, etc.

[0058] In this specification, the refractive index of the fine particles is a value calculated by preparing a transparent dispersion in which the fine particles are dispersed in an organic solvent, using a sodium D line with a wavelength of 589.3 nm, measuring the refractive index at 20 °C, and extrapolating to a state where the fine particles are 100% by volume based on the specific gravity of the fine particles and the organic solvent.

[0059] The average particle diameter of component (E) is not particularly limited, but from the viewpoint of light transmittance, it is preferably 300 nm or less, more preferably 200 nm or less, still more preferably 100 nm or less. On the other hand, from the viewpoint of being easily and industrially dispersible of component (E) in the resin composition of the present invention, it is preferably 1 nm or more, more preferably 5 nm or more. In this specification, the average particle diameter of the fine particles is the particle diameter at which the cumulative amount from the smaller side of the fine particles becomes 50% by mass in the particle diameter distribution curve measured by the laser diffraction / scattering method.

[0060] The blending ratio of component (E) is an optional component and is not particularly limited. From the viewpoint of surely obtaining the use effect of component (E), the blending ratio of component (E) is 10 parts by mass or more, preferably 20 parts by mass or more, more preferably 30 parts by mass or more, with the total of components (A) and (B) being 100 parts by mass. On the other hand, from the viewpoint of enhancing the impact resistance of the fiber-containing resin molded body, the blending ratio of component (E) is 200 parts by mass or less, preferably 120 parts by mass or less, more preferably 80 parts by mass or less.

[0061] From the viewpoint of improving the curability of the resin composition, the resin composition of the present invention preferably further contains at least one of a compound having two or more isocyanate groups in one molecule and a photopolymerization initiator.

[0062] Examples of the compound having two or more isocyanate groups in one molecule include aliphatic isocyanates such as trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, and pentamethylene diisocyanate; aromatic isocyanates such as 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, and 2,4-tolylene diisocyanate; and alicyclic isocyanates such as 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate and 1,3-cyclopentane diisocyanate.

[0063] Examples of the photopolymerization initiator include acetophenone-based polymerization initiators such as 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-phenylpropan-1-one; benzoin-based polymerization initiators such as benzoin and 2,2-dimethoxy-1,2-diphenylethane-1-one; benzophenone-based polymerization initiators such as benzophenone, [4-(methylphenylthio)phenyl]phenylmethanone, and 4-hydroxybenzophenone; and thioxanthone-based polymerization initiators such as 2-chlorothioxanthone and 2,4-diethylthioxanthone.

[0064] The resin composition of the present invention may contain other components in addition to the above components (A) to (E). The other components are, for example, sensitizers, beads such as resin beads and glass beads, antistatic agents, antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoaming agents, corrosion inhibitors, and the like. In the fiber-containing resin molded body, from the viewpoint of suppressing a decrease in surface flatness due to the difference between the linear expansion coefficient of the resin composition and the linear expansion coefficient of the fiber, it is preferable to contain micro glass beads of borosilicate glass having a diameter of about 2 to 10 μm.

[0065] The resin composition of the present invention is obtained by mixing and stirring the above components. From the viewpoint of enhancing the heat resistance of the fiber-containing resin composition, the glass transition temperature in the cured product of the resin composition of the present invention is preferably 50 °C or higher, more preferably 80 °C or higher, and still more preferably 100 °C or higher. On the other hand, from the viewpoint of enhancing the impact resistance of the fiber-containing resin composition, the glass transition temperature in the cured product of the resin composition of the present invention is 200 °C or lower, preferably 160 °C or lower.

[0066] The glass transition temperature in the cured product of the resin composition is the temperature at the peak top of the temperature-loss tangent tanδ curve obtained by measuring in accordance with JIS K7244-4:1999, using a thermomechanical analyzer, setting a tensile sine wave at 1 Hz, and with a heating rate of 2 °C / min. When there are multiple peak tops, it is interpreted that there are multiple glass transition temperatures in the cured product of the resin composition. For example, when the cured product of the resin composition exhibits a sea-island structure morphology, two glass transition temperatures corresponding to the sea and the island, respectively, can be observed.

[0067] [2. Fiber-containing resin molded body, and article] The fiber-containing resin molded article of the present invention is formed using the resin composition of the present invention and contains fibers. An example of the shape of the fiber-containing resin molded article is a film, sheet, or plate containing fibers in the form of a nonwoven fabric or a woven fabric. The article of the present invention includes a fiber-containing resin molded article. An example of the article of the present invention is a laminated glass including a sheet, which is an example of the fiber-containing resin molded article, and a glass layer. Another example of the article of the present invention is a front panel such as an image display device, which is obtained by processing a sheet or a plate, which is an example of the fiber-containing resin molded article.

[0068] As shown in FIG. 2, the method for manufacturing a fiber-containing resin molded article includes a step of impregnating a nonwoven fabric, which is an example of the form of fibers, with a resin composition (step 101), and a step of curing the resin composition impregnated in the nonwoven fabric to form a sheet (step 102). The method for manufacturing an article includes the method for manufacturing a fiber-containing resin molded article and a step of bonding a sheet manufactured by the manufacturing method to a glass layer (step 103).

[0069] The step of impregnating the nonwoven fabric with the resin composition uses, for example, an ultraviolet curable resin composition as an example of the resin composition and impregnates the nonwoven fabric with the ultraviolet curable resin composition. The step of forming the sheet is performed, for example, by irradiating ultraviolet rays on the nonwoven fabric impregnated with the ultraviolet curable resin composition.

[0070] As shown in FIG. 3, the laminated glass 1, which is an example of an article, is used, for example, as a windshield 12 such as a sunroof 11, a front windshield, a rear windshield, or a side windshield of a vehicle 10.

[0071] As shown in FIG. 4, the laminated glass 1 includes a glass layer 21 containing an inorganic glass 20i as a constituent material, and a translucent resin layer 22 laminated on the glass layer 21. The inorganic glass 20i is, for example, soda-lime glass, borosilicate glass, quartz glass, or the like. The translucent resin layer 22 is a sheet which is an example of a fiber-containing resin molded body. The laminated glass 1 includes an adhesive layer for adhering the glass layer 21 and the translucent resin layer 22 between the glass layer 21 and the translucent resin layer 22. The laminated glass 1 is used with the glass layer 21 facing the outside of the vehicle and the translucent resin layer 22 facing the inside of the vehicle.

[0072] As shown in FIG. 5, the translucent resin layer 22 includes a cured product 24 of the above-described resin composition and the above-described fiber 23. The fiber 23 is included in the cured product 24 in a randomly oriented form. The constituent material of the fiber 23 included in the cured product 24 is, for example, inorganic glass 23g.

[0073] The constituent material of the fiber 23 and the constituent material of the glass layer 21 may be the same material as each other or may be different materials from each other. When the constituent material of the fiber 23 and the constituent material of the glass layer 21 are the same material as each other, the laminated glass 1 has a small difference between the linear expansion coefficient of the glass layer 21 and the linear expansion coefficient of the translucent resin layer 22, and thus is suitable for an article used in an environment where the temperature change is large, such as the above-described sunroof 11 and windshield 12.

[0074] As an example of the fiber-containing resin molded body of the present invention, the visible light transmittance (measured in accordance with the visible light transmittance test of 6.4 of JIS A5759:2016 except that the fiber-containing resin molded body was not bonded to a glass plate and the fiber-containing resin molded body itself was measured.) is preferably 80% or more, more preferably 85% or more, and still more preferably 88% or more. When the visible light transmittance of the fiber-containing resin molded body is 80% or more, it can be suitably used for an article that requires high transparency, such as a sunroof or a windshield. When high transparency is desired, the higher the visible light transmittance, the more preferable.

[0075] As an example of the fiber-containing resin molded article of the present invention, the haze (measured in accordance with JIS K 7136:2000) is preferably 10% or less, more preferably 6% or less, still more preferably 4% or less, and even more preferably 3% or less. When the haze of the fiber-containing resin molded article is 10% or less, it can be suitably used for articles that require a clear transparency, such as sunroofs and windshields. When a clear transparency is desired, the smaller the haze, the more preferable.

[0076] As an example of the fiber-containing resin molded article of the present invention, the difference (absolute value) between the haze (measured in accordance with JIS K 7136:2000) and the haze after heat treatment (measured in accordance with JIS K 7136:2000 after treatment at 90°C for 2 minutes) is preferably 10% or less, more preferably 5% or less, still more preferably 3% or less, even more preferably 2% or less, and most preferably 1% or less. When the difference between the haze of the fiber-containing resin molded article and the haze after heat treatment is 10% or less, it can be suitably used for articles used in an environment with a large temperature change, such as sunroofs and windshields. When used in an environment with a large temperature change, the smaller the difference between the haze and the haze after heat treatment, the more preferable.

[0077] [Examples] Hereinafter, the present invention will be described by showing examples, but the present invention is not limited thereto. [Measurement method] (1-1) Refractive index of resin composition Except for changing the temperature to 25°C, in accordance with Method A of JIS K7142:2014, using a multi-wavelength Abbe refractometer "DR-M4 (trade name)" (manufactured by Atago Co., Ltd.), the refractive index of the cured product of the resin composition was measured. At this time, the sodium D line with a wavelength of 589.3 nm was used, and 1-bromonaphthalene was used as the contact liquid. The measurement was carried out under the condition that the surface of the sample that was in contact with the lower glass plate during sample preparation was in contact with the prism surface. The sample used was a resin molded body with a cured thickness of 300 μm, in which the resin composition was sandwiched between two glass plates with a spacer.

[0078] (1-2) Glass transition temperature of the resin composition In accordance with JIS K7244-4:1999, using a thermomechanical analyzer (TMA) "DMS6100 (trade name)" (manufactured by Seiko Instruments Inc.), the glass transition temperature in the cured product of the resin composition was measured. At this time, the distance between the chucks was set to 10 mm, the tensile sine wave was set to 1 Hz, the sample was held at -50 °C for 3 minutes, and then the temperature was raised to 200 °C at a heating rate of 2 °C / min for measurement. Then, the peak top value of the temperature-loss tangent tanδ curve was taken as the glass transition temperature in the cured product of the resin composition. When there were two or more peaks, the two peak top values were recorded. The sample was cut out from the cured product obtained in the same manner as (1-1), and a sample piece with a length of 20 mm and a width of 10 mm was used.

[0079] (1-3) Refractive index of the fiber Except for changing the temperature to 25 °C, in accordance with Method B of JIS K7142:2014, using a multi-wavelength Abbe refractometer "DR-M4 (trade name)" (manufactured by Atago Co., Ltd.) and a digital microscope "KH-8700 (trade name)" (manufactured by Highrox Co., Ltd.), the refractive index of the fiber was measured. At this time, the sodium D line with a wavelength of 589.3 nm was used, and a mixed solution of 1-bromonaphthalene and benzyl alcohol was used as the immersion liquid.

[0080] (2) Evaluation of the fiber-containing resin molded body (2-1) Visible light transmittance Except for measuring the fiber-containing resin molded body itself without laminating it on a glass plate, in accordance with the visible light transmittance test in 6.4 of JIS A5759:2016, using a spectrophotometer "SolidSpec-3700 (trade name)" (manufactured by Shimadzu Corporation), the visible light transmittance (unit: %) of the fiber-containing resin molded body was measured.

[0081] (2-2) Haze In accordance with JIS K 7136:2000, the haze (unit: %) of the fiber-containing resin molded body was measured using a turbidimeter "NDH2000 (trade name)" (manufactured by Nippon Denshoku Industries Co., Ltd.).

[0082] (2-3) Coefficient of linear expansion In accordance with JIS K 7197:2012, the coefficient of linear expansion (unit: ppm) of the fiber-containing resin molded body was measured using a thermomechanical analyzer (TMA) "DMS6100 (trade name)" (manufactured by Seiko Instruments Inc.). At this time, the distance between chucks was set to 10 mm, the tensile load was set to 4 mN / mm 2 and the sample was held at -50°C for 3 minutes, and then measured under the condition of increasing the temperature to 150°C at a rate of 5°C / min. Then, from the temperature-specimen length curve, with the low-temperature side temperature at -40°C and the high-temperature side temperature at 120°C, the coefficient of linear expansion (unit: ppm) of the fiber-containing resin molded body was calculated. Also, for the purpose of measuring the coefficient of linear expansion as an index of the dimensional stability of the fiber-containing resin molded body, the state of the fiber-containing resin molded body at the maximum measurement temperature was not adjusted. The sample used was a sample piece having a length of 20 mm and a width of 10 mm cut from the fiber-containing resin molded body.

[0083] (2-4) Surface smoothness In accordance with JIS B0633:2001, using a contact roughness meter "Handy Surf E-35B (trade name)" (manufactured by Tokyo Seimitsu Co., Ltd.), with the cut-off value λc set to 0.8 mm and the measurement length set to 4.0 mm, the arithmetic mean roughness Ra (unit: μm) of the fiber-containing resin molded body was measured.

[0084] (2-5) Haze after heat treatment After heating the fiber-containing resin molded body in a gear oven at 90°C for 2 minutes, in the same manner as in (2-2) above, the haze (unit: %) of the fiber-containing resin molded body after heat treatment was measured.

[0085] (2-6) Surface smoothness after heat treatment The fiber-containing resin molded body was heated in a gear oven at 90 °C for 2 minutes, and then, in the same manner as in (2-4) above, the arithmetic mean roughness Ra (unit: μm) of the fiber-containing resin molded body after the heat treatment was measured.

[0086] (2-7) Falling ball test The fiber-containing resin molded body was placed flat on the surface of a stainless steel plate with a thickness of 1 mm, and a steel ball with a diameter of 20 mm and a weight of 45 g was dropped from a predetermined height set every 10 cm. The test was repeated to determine the lowest height at which cracks occurred in the fiber-containing resin molded body. In Table 1, the lowest height is shown. For example, if the numerical value described in Table 1 is 50 cm, it indicates that no cracks occurred at a height of 40 cm, but cracks occurred at 50 cm. Also, “>70 cm” described in Table 1 means that the test was stopped because no cracks occurred even at a height of 70 cm.

[0087] [Constituent materials] The resin compositions and fiber-containing resin molded bodies of the respective examples were obtained using the components listed below. (A1-1) Bifunctional aromatic (meth)acrylate: Ethylene oxide-modified bisphenol A type diacrylate (CAS No. 64401-02-1) (A1-2) Polyfunctional aromatic (meth)acrylate: “OGSOL EA-F5710 (trade name)” (manufactured by Osaka Gas Chemical Co., Ltd. / Polyfunctional (meth)acrylate having a fluorene skeleton) (A2-1) Prepolymer: Urethane (meth)acrylate “EBECRYL 4100 (trade name)” (manufactured by Daicel Ornex Co., Ltd.) / The number of (meth)acryloyl groups in one molecule is 3, the number average molecular weight is 1100, and the mass average molecular weight is 2800. (A2-2) Prepolymer: “GX-8821L-M9 (trade name)” (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) / The number of (meth)acryloyl groups in one molecule is 2 or more. (A3-1) Bifunctional alicyclic acrylate: Tricyclodecane dimethanol diacrylate (CAS No. 42594-17-2)

[0088] (B1-1) N-substituted (meth)acrylamide compound: 4-acryloylmorpholine (CAS No. 5117-12-4) (B2-1) Aromatic monofunctional (meth)acrylate: (3-phenoxyphenyl)methyl 2-propenoate (CAS No. 409325-06-0) (B2-2) Aromatic monofunctional (meth)acrylate: 2-hydroxy-3-phenoxypropyl acrylate (CAS No. 16969-10-1)

[0089] (C-1) Compound having two or more secondary thiol groups in one molecule: Pentaerythritol tetrakis(3-mercaptobutyrate) (CAS No. 3177589-0) (D-1) Silane coupling agent: Polymer type silane coupling agent "X12-1050 (trade name)" (manufactured by Shin-Etsu Chemical Co., Ltd.) (E-1) High refractive index fine particles: Dispersion of zirconium oxide "NSX-401M (trade name)" (manufactured by Kyoeisha Chemical Co., Ltd.). (F-1) Photoinitiator: 1-hydroxycyclohexyl-phenyl ketone (CAS No. 947-19-3) (F-2) Photoinitiator: 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (CAS No. 75980-60-8) (P-1) Fiber: Inorganic glass fiber "MF30P (trade name)" (manufactured by Nitto Boseki Co., Ltd.) was calcined at 650 °C before use.

[0090] Note that component (A1-2) can also function as a prepolymer in each example containing component (A1-2). Component (B2-2) is a (meth)acrylate obtained by modifying the epoxy group contained therein using a monofunctional (meth)acrylate containing an epoxy group as a starting material, and a small amount of the unreacted starting material remains, resulting in an epoxy index of 1.0×10 -2 eq / Kg, so it can also function as the above-mentioned component (B3).

[0091] [Example 1] Using 15 parts by mass of component (A1-1), 8 parts by mass of component (A2-1), 26 parts by mass of component (B1-1), 20 parts by mass of component (B2-1), 31 parts by mass of component (B2-2), 2 parts by mass of component (C-1), 3 parts by mass of component (D-1), 2 parts by mass of component (F-1), and 1 part by mass of component (F-2), the resin composition (R-1) of Example 1 was obtained.

[0092] Using the above-described method for producing a fiber-containing resin molded article using the resin composition (R-1) of Example 1 and component (P-1), a fiber-containing resin molded article of Example 1, which is a sheet having a thickness of 0.35 mm, was obtained. At this time, the content of component (P-1) was 11.1% by mass.

[0093] The refractive index of component (P-1) is shown in Table 1. Also, the refractive index, glass transition temperature, refractive index difference Δn, visible light transmittance (unit: %), haze (unit: %), linear expansion coefficient (unit: ppm), arithmetic mean roughness Ra (unit: μm), haze after heat treatment (unit: %), arithmetic mean roughness after heat treatment (unit: μm), and the measurement results of the ball drop test (unit: cm) of the fiber-containing resin molded article of Example 1 are shown in Table 1.

[0094] [Example 2] Using the above-described method for producing a fiber-containing resin molded article using the resin composition (R-1) of Example 1 and component (P-1), a fiber-containing resin molded article of Example 2, which is a sheet having a thickness of 0.55 mm, was obtained. At this time, the content of component (P-1) was 14.1% by mass. The measurement results of each property of the fiber-containing resin molded article of Example 2 are shown in Table 1.

[0095] [Example 3] Using 24 parts by mass of component (A2-2), 21 parts by mass of component (A3-1), 56 parts by mass of component (B1-1), 8 parts by mass of component (C-1), 5 parts by mass of component (D-1), 51 parts by mass of component (E-1), 3 parts by mass of component (F-1), and 2 parts by mass of component (F-2), the resin composition (R-2) of Example 3 was obtained.

[0096] Using the above-described method for producing a fiber-containing resin molded article using the resin composition (R-2) of Example 3 and component (P-1), a fiber-containing resin molded article of Example 3, which is a sheet having a thickness of 0.32 mm, was obtained. At this time, the content of component (P-1) was 10.9% by mass. The measurement results for each of the fiber-containing resin molded articles of Example 3 are shown in Table 1.

[0097] [Example 4] A resin composition (R-2) of Example 4 was obtained by using 42 parts by mass of component (A1-2), 21 parts by mass of component (A3-1), 37 parts by mass of component (B1-1), 5 parts by mass of component (C-1), 3 parts by mass of component (D-1), 2 parts by mass of component (F-1), and 1 part by mass of component (F-2).

[0098] Using the above-described method for producing a fiber-containing resin molded article using the resin composition (R-3) of Example 4 and component (P-1), a fiber-containing resin molded article of Example 4, which is a sheet having a thickness of 0.35 mm, was obtained. At this time, the content of component (P-1) was 11.5% by mass. The measurement results for each of the fiber-containing resin molded articles of Example 4 are shown in Table 1.

[0099] [Example 5] Using the above-described method for producing a fiber-containing resin molded article using the resin composition (R-3) of Example 4 and component (P-1), a fiber-containing resin molded article of Example 5, which is a sheet having a thickness of 0.58 mm, was obtained. At this time, the content of component (P-1) was 13.3% by mass. The measurement results for each of the fiber-containing resin molded articles of Example 5 are shown in Table 1.

[0100] [Example 6] In the method for producing a fiber-containing resin molded article, a resin molded article of Example 6, which is a sheet having a thickness of 0.28 mm, was obtained in the same manner as in Example 1 except that component (P-1) was not added. The measurement results for each of the resin molded articles of Example 6 are shown in Table 1.

[0101]

Table 1

[0102] As shown in Table 1, in any of the fiber-containing resin molded articles of Examples 1 to 5, the refractive index difference between the fiber and the resin composition was 0.10 or less. The visible light transmittance of the fiber-containing resin molded articles of Examples 1 to 5 all showed high values of 89.1% or more, and it was confirmed that they were almost equivalent to the visible light transmittance of Example 6 that does not contain fibers. That is, it was confirmed that by using a resin composition not containing a solvent, shrinkage during curing of the resin composition is suppressed, and the translucency of the fiber-containing resin molded article can be improved.

[0103] In addition, in any of the fiber-containing resin molded articles of Examples 1 to 5, the haze before heat treatment showed a low value of 8.9% or less. In particular, in Examples 3 to 5, it was confirmed that the haze was equivalent to that of Example 6 that does not contain fibers, or better than that of Example 6. Furthermore, in any of the fiber-containing resin molded articles of Examples 1, 3 to 5, the haze after heat treatment showed a low value of 9.5% or less. In particular, in Examples 3 to 5, it was better than the haze of Example 6 that does not contain fibers, and it was confirmed that it can be suitably applied to an environment with a large temperature change.

[0104] In addition, in any of the fiber-containing resin molded articles of Examples 1 to 5, the arithmetic mean roughness Ra showed a low value of 0.19 μm or less. In particular, in Examples 3 to 5, it was confirmed that the arithmetic mean roughness Ra was equivalent to that of Example 6 that does not contain fibers, or better than that of Example 6. Furthermore, in any of the fiber-containing resin molded articles of Examples 3 to 5, the arithmetic mean roughness Ra after heat treatment showed a low value of 0.12 μm or less. In particular, in Examples 4 and 5, it was confirmed that it was better than the arithmetic mean roughness Ra of Example 6 that does not contain fibers.

[0105] And in any of the fiber-containing resin molded articles of Examples 1 to 5, the lowest height in the ball drop test showed a high value of 20 cm or more. In particular, in Example 1, it was confirmed to have good impact resistance of 50 cm. When the above test (2-7) was performed on soda-lime glass with a thickness of 1 mm, breakage was observed at a height of 10 cm.

Explanation of Reference Numerals

[0106] 1…Laminated glass, 10…Vehicle, 11…Sunroof, 12…Windshield, 20i, 23g…Inorganic glass, 21…Glass layer, 22…Translucent resin layer, 23…Fiber, 24…Hardened product, 101, 102, 103…Steps.

Claims

1. A curable composition for forming a resin molded body containing fibers, comprising: 5% by mass or more and 90% by mass or less of (A) a polyfunctional (meth)acrylate, 10% by mass or more and 95% by mass or less of (B) a monofunctional (meth)acrylate or a monofunctional N-substituted (meth)acrylamide, wherein the total of the above component (A) and the above component (B) is 100% by mass, the refractive index difference between the fiber and the curable composition is 0.10 or less, the fiber is an inorganic glass fiber, furthermore, (C) a compound having two or more secondary thiol groups in one molecule is contained in an amount of 0.5 parts by mass or more and 20 parts by mass or less based on 100 parts by mass of the total of the above component (A) and the above component (B), the refractive index of the fiber is a value measured under the conditions of a sodium D line with a wavelength of 589.3 nm and 1-bromonaphthalene as a contact liquid in accordance with Method B of JIS K7142:2014, except that the temperature is changed to 25°C, the refractive index of the curable composition is a value measured under the conditions of a sodium D line with a wavelength of 589.3 nm and 1-bromonaphthalene as a contact liquid in accordance with Method A of JIS K7142:2014, except that the temperature is changed to 25°C, with the completely cured curable composition as the measurement object, solvent-free, Curable composition: Here, the glass transition temperature of the cured product of the curable composition is 160°C or lower, the glass transition temperature is the temperature at the peak top of the temperature-loss tangent tanδ curve measured in accordance with JIS K7244-4:1999, using a thermomechanical analyzer, setting a tensile sine wave to 1 Hz, and with a heating rate of 2°C / min.

2. Furthermore, (D) a silane coupling agent is contained in an amount of 0.5 parts by mass or more and 10 parts by mass or less based on 100 parts by mass of the total of the above component (A) and the above component (B), The curable composition according to claim 1.

3. Furthermore, (E) high refractive index fine particles having a refractive index of 1.5 or more and 2.8 or less are contained in an amount of 10 parts by mass or more and 200 parts by mass or less based on 100 parts by mass of the total of the above component (A) and the above component (B), The curable composition according to claim 1 or 2.

4. The above component (A) contains (A1) a polyfunctional (meth)acrylate having an aromatic ring The curable composition according to any one of claims 1 to 3.

5. The above component (A) contains a polyfunctional (meth)acrylate having a fluorene skeleton The curable composition according to any one of claims 1 to 4.

6. The component (B) contains (B1) a monofunctional N-substituted (meth)acrylamide compound The curable composition according to any one of claims 1 to 5.

7. A fiber-containing resin molded body formed using the curable composition according to any one of claims 1 to 6 and containing the inorganic glass fiber

8. The inorganic glass fiber is 5% by mass or more and 40% by mass or less The fiber-containing resin molded body according to claim 7.

9. A vehicle windshield comprising the fiber-containing resin molded body according to claim 7 or 8. ​

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