TW201838813A - Transparent sheet, smoke barrier wall comprising the transparent sheet, and manufacturing method of transparent sheet in which the transparent sheet comprises a glass fiber cloth having a thickness of 8 to 30[mu]m - Google Patents

Abstract

The main object of the present invention is to provide a transparent sheet which can improve the initial tearing strength and enhance and maintain transparency when the glass fiber cloth in the transparent resin composite that are made up of the glass fiber and the resin is thinner. The transparent sheet of the present invention comprises a glass fiber cloth having a thickness of 8 to 30[mu]m; a cured resin composition layer contained therein in a state in which the glass fiber cloth is impregnated; and a thermoplastic resin layer laminated on the cured resin composition layer and containing a thermoplastic resin other than the polyvinyl chloride resin.

Description

Transparent sheet, anti-smoke wall comprising the transparent sheet, and manufacturing method of transparent sheet

The present invention relates to a transparent sheet, particularly a transparent sheet suitable for use in a smoke preventing wall or the like, a smoke preventing wall using the same, and a method of producing the transparent sheet.

The Building Standards Act and the Building Standards Act are required to provide smoke evacuation equipment to prevent the flow of smoke and poisonous gases generated during a fire in a building, so that evacuation and fire fighting activities can be carried out smoothly. Therefore, in buildings such as office buildings and commercial buildings, there are many smoke-proof vertical walls and the like as smoke exhausting devices and smoke-proof devices.

The smoke-proof vertical wall is usually installed on the ceiling of a building, and the purpose is to temporarily block the flow of smoke, poison gas, etc., when the fire occurs, to the corridor or the upper floor, and to ensure the time required for evacuation. Therefore, in order to prevent the smoke-proof wall from obstructing the visual field and to impair the appearance, a transparent plate glass, a transparent resin composite of glass fiber and resin, or the like is used for the smoke prevention wall. The transparent resin composite of glass fiber and resin has the advantage that the transparent plate glass is not easily broken. For example, Patent Document 1 discloses a transparent non-combustible sheet comprising a glass fiber woven fabric and a hardened resin layer.

Further, for example, Patent Document 2 discloses a transparent non-combustible sheet having a base material layer comprising a glass fiber cloth and a transparent hardened resin layer impregnated with the glass fiber cloth, and on the substrate A reinforcing layer is integrally formed on at least one side of the layer. Prior Technical Literature Patent Literature

Patent Document 1: Japanese Patent Laid-Open Publication No. Hei. No. 2005-319746. Patent Document 2: Japanese Patent Laid-Open No. 2011-213093

Disclosure of the Invention Problems to be Solved by the Invention However, for example, the transparent non-combustible sheet disclosed in Patent Document 1 is excellent in non-combustibility, but has a problem of high haze and insufficient transparency.

The inventors of the present invention have reviewed the reason why the transparency of the transparent non-combustible sheet is insufficient. Further, the inventors of the present invention have found that, for example, the transparent non-combustible sheet specifically disclosed in the Patent Document 1 uses a relatively thick glass fiber woven fabric having a thickness of about 100 μm for excellent incombustibility, and is incident on the light. The refraction or reflection of the interface between the glass fiber and the hardened resin increases, resulting in insufficient transparency.

Then, the inventors of the present invention have thought that the glass fiber woven fabric of the transparent non-combustible sheet disclosed in Patent Document 1 is made thinner, for example, 30 μm or less, to improve transparency. However, when the thickness of the glass fiber woven fabric of the transparent non-combustible sheet disclosed in Patent Document 1 is thinned, it is known that the tear strength, particularly the initial tear strength, tends to be deteriorated.

On the other hand, according to the transparent non-combustible sheet disclosed in Patent Document 2, since the reinforcing layer is integrally formed at least on one surface, the tear strength of the entire transparent incombustible sheet can be highly maintained. Further, it has been revealed that a mesh body composed of glass fibers or a vinyl chloride resin film or the like is used singly or in combination as a reinforcing layer. However, when a mesh body made of glass fiber is used as the reinforcing layer, the haze will become high, and there is a problem that high transparency cannot be obtained even when the manufacturing is completed. Further, when a vinyl chloride resin film is used as the reinforcing layer, there are few problems in an ordinary environment, but when it is used as a smoke-proof wall for a long period of time in a high-temperature and high-humidity environment, there is a problem that transparency may not be maintained. In other words, in the conventional technique of the transparent composite of glass fiber and resin, the transparency and the initial tear strength after long-term use at the time of completion of manufacture and in a high-temperature and high-humidity environment are deteriorated as long as one performance is increased. Mutual compensation relationship.

Under such circumstances, the main object of the present invention is to provide a transparent sheet which can increase the initial tear strength in the case where the glass fiber cloth in the transparent resin composite of the glass fiber and the resin is made thinner, and It can be easily improved in transparency after long-term use in a newly manufactured and high-temperature and high-humidity environment. Means to solve the problem

The inventors of the present invention have conducted intensive studies to solve the problems as described above. As a result, the inventors of the present invention have found that the transparent non-combustible sheet disclosed in Patent Document 2 may not be maintained after long-term use as a smear-proof wall using a vinyl chloride resin film as a reinforcing layer in, for example, a high-temperature and high-humidity environment. The reason for the transparency is that the plasticizer contained in the vinyl chloride resin film is bleed-out.

In other words, the present inventors have found that a vinyl chloride resin film contains a large amount of a plasticizer, and when it is laminated on a hardened resin composition layer, if it is used as a smoke-proof wall for a long period of time in a high-temperature and high-humidity environment, The plasticizer is transferred (overflow) to the interface between the vinyl chloride resin film and the hardened resin composition layer, and there is a case where transparency cannot be maintained.

Further, as a result of a review by the present inventors, it has been found that the thickness of the glass fiber cloth is set to 8 to 30 μm to improve the transparency of the newly manufactured product, and the thermoplasticity other than the polyvinyl chloride resin not containing the plasticizer is obtained. The resin layer is used as a layer laminated on the hardened resin composition layer, and after long-term use as a smoke-proof wall in a high-temperature and high-humidity environment, the transparency of the immediately-prepared manufacturing can be maintained and the initial tear strength can be improved. The present invention has been completed based on further review of these findings.

That is, the present invention provides an invention as disclosed in the following. Item 1. A transparent sheet comprising: a glass fiber cloth having a thickness of 8 to 30 μm; a hardened resin composition layer contained therein in a state in which the glass fiber cloth is impregnated; and a layer laminated on the hardened resin composition layer A thermoplastic resin layer containing a thermoplastic resin other than a polyvinyl chloride resin. The transparent sheet according to item 1, wherein the hardened resin composition layer is obtained by curing a resin composition containing an acrylic slurry. Item 3. The transparent sheet according to Item 1 or 2, wherein the glass fiber woven fabric, the glass filament constituting the woven fabric has an average filament diameter of 3.5 to 4.5 μm and a filament number of 20 to 110, and the foregoing The weaving density of the fabric is 80~120/25mm, the thickness is 9~30μm, and the quality is 9~35g/m ² . The transparent sheet according to any one of the items 1 to 3, wherein the total thickness of the cured resin composition layer and the thermoplastic resin layer in the transparent sheet is 150 to 300 g/m ² . The transparent sheet according to any one of items 1 to 4, wherein the peelable cover material is peeled off when the surface of the thermoplastic resin layer is laminated, and the thermoplastic resin layer is contained at least on the surface side. Antistatic agent. Item 6. The transparent sheet according to any one of items 1 to 5, wherein the total light transmittance before and after the accelerated test is 90% or more and the haze is 3% or less. (Promotion test method) The transparent sheet was placed in a constant temperature and humidity machine, and heated in a moist heat environment at 50 ° C and a humidity of 90% for 7 days, and dried and naturally cooled. Item 7. A smoke-proof vertical wall comprising a transparent sheet of any one of items 1 to 6. Item 8. The method for producing a transparent sheet, the transparent sheet comprising: a glass fiber cloth, a photocurable resin composition layer contained therein in a state in which the glass fiber cloth is impregnated, and a layer of the photocurable resin a thermoplastic resin layer constituting the material layer; the method for producing the transparent sheet comprising the steps of: preparing a light transmissive thermoplastic resin film having at least two laminated light transmissive covering materials; and step B, by the foregoing steps In the two thermoplastic resin films obtained in A, the light-hardening resin composition impregnated with the glass fiber cloth and uncured is placed so that the light-transmitting cover material is located outside, and in the state, the unhardened light is applied. The cured resin composition is irradiated with light to cure the uncured photocurable resin composition. Effect of the invention

According to the present invention, it is possible to provide a transparent sheet which can improve the initial tear strength in the case where the glass fiber cloth in the composite of the glass fiber and the resin is made thin, and can be easily manufactured and finished. The transparency after long-term use in a high-temperature and high-humidity environment (hereinafter, collectively referred to as "transparency before and after use in a high-temperature and high-humidity environment" is excellent. Therefore, the transparent sheet of the present invention is suitable for, for example, a smoke preventing wall or the like.

The transparent sheet of the present invention is characterized by comprising: a glass fiber cloth having a thickness of 8 to 30 μm; a hardened resin composition layer impregnated with the glass fiber cloth; and a layer laminated on the hardened resin composition layer and comprising a poly A thermoplastic resin layer of a thermoplastic resin other than a vinyl chloride resin.

For example, as shown in FIG. 1, the transparent sheet 1 of the present invention has a laminated structure comprising: a glass fiber cloth 2; a hardened resin composition layer 3 impregnated with the glass fiber cloth 2; and a thermoplastic resin other than the polyvinyl chloride resin (hereinafter, abbreviated as follows) It is "thermoplastic resin layer 4"). The transparent sheet 1 may contain at least one layer of the glass cloth 2, and may contain a plurality of layers.

The hardened resin composition layer 3 in Fig. 1 is filled in a slit of a plurality of glass fibers constituting the glass fiber cloth 2, and one surface side portion (the surface 31 of the hardened resin composition layer) and the other surface side portion of the cured resin composition layer 3 are hardened. (The surface 32 of the hardened resin composition layer) is in communication with the slit portion. Further, in the transparent sheet 1 of the present invention, as shown in Fig. 1, for example, it is preferable that the cured resin composition layer 3 is formed on at least one surface of the layer of the glass fiber cloth 2 from the viewpoint of improving transparency. It is preferable that the cured resin composition layer 3 is formed on the surface of the layer of the glass fiber cloth 2.

Moreover, the transparent sheet 1 of the present invention may have other layers laminated on the surface side of the thermoplastic resin layer 4 as needed. The other layer is, for example, as shown in Fig. 2, and the peelable cover material 5 which can be peeled off during use can be laminated. Further, as shown in FIG. 3, between the peelable cover material 5 which is peeled off during use and the thermoplastic resin layer 4, for example, an antistatic layer 6 containing a metal or a metal compound may be laminated, the antistatic layer 6 being The transparent sheet of the present invention is disposed as a surface layer when used as a smoke preventing wall. Hereinafter, the composition of each layer constituting the transparent sheet 1 of the present invention will be described in detail.

(Glass fiber cloth 2) The glass fiber cloth 2 of the transparent sheet 1 of the present invention is composed of a plurality of glass fibers. Most of the glass fibers in the glass cloth 2 are intertwined to form one cloth. The glass fiber cloth 2 is exemplified by a glass fiber woven fabric (glass cloth) composed of a plurality of warp yarns and a plurality of weft yarns. The weave structure of the glass fiber fabric is not particularly limited, and examples thereof include plain weave, satin weave, twill weave, oblique weave, weave, and the like.

The glass material constituting the glass fiber of the glass fiber cloth 2 is not particularly limited, and a well-known glass material can be exemplified. Examples of the glass material include alkali-free glass (E glass), acid-resistant alkali-containing glass (C glass), high strength × high modulus glass (S glass, T glass, etc.), alkali resistant glass (AR glass), and the like. It is preferable to use a highly versatile alkali-free glass (E glass). The glass fiber constituting the glass fiber cloth 2 may be composed of one type of glass material, or may be a combination of two or more kinds of glass fibers composed of different glass materials. Moreover, from the viewpoint of further improving the transparency, it is preferable to select a glass material which is similar in refractive index to the cured resin composition layer 3 to be described later.

The thickness of the glass fiber cloth in the transparent sheet 1 of the present invention is 8 to 30 μm. By making a glass fiber cloth which is thinner than the composite material of the transparent resin and the glass cloth of the prior art, the non-flammable property can be maintained and the transparency before and after the use of the transparent sheet in a high-temperature and high-humidity environment can be improved. The thickness is preferably 8 to 30 μm, more preferably 9 to 20 μm, and particularly preferably 9 to 13 μm.

Further, in the case of inventing the transparent sheet 1, it is possible to further reduce the haze of the transparent sheet before and after use in a high-temperature and high-humidity environment, and to more easily prevent the glass fiber cloth from being woven after the resin contained in the transparent sheet is burned. In view of the above, it is preferable that the glass fiber woven fabric has an average filament diameter of 3.5 to 4.5 μm and a filament number of 20 to 110, and the woven density of the woven fabric is latitude and longitude. Both are 80~120/25mm, the thickness is 9~30μm, and the quality is 9~35g/m ² .

Further, in the glass fiber woven fabric, the thickness of the glass fiber woven fabric is divided by the diameter of the warp glass ray and the diameter of the weft glass ray from the viewpoint of more easily preventing the woven ray from being generated by burning the resin contained in the transparent sheet. The value after the average value (thickness of glass cloth / {(diameter of warp glass filament + diameter of weft glass filament) / 2}) is preferably in the range of 2.5 or more and less than 3.5.

For example, when the transparent sheet 1 of the present invention is used as a smoke preventing wall, the glass cloth has an effect of preventing smoke from diffusing when a fire occurs. In addition, when hot air is transmitted to the ceiling when a fire occurs, it is required to prevent the occurrence of this by preventing the smoke from falling.

On the other hand, the thickness of the glass fiber woven fabric having the above configuration is about several times with respect to the average filament diameter, and is about several filaments. That is, the configuration of the glass fiber woven fabric also means that the filaments having a plurality of roots are widened in the plane direction of the glass fabric. Flattening a glass yarn containing a specific number of filaments of a specific filament diameter to make the glass fiber fabric a specific thickness, whereby the resin component burns even when a fire occurs, compared to a non-flattened round glass yarn. The texture is also less susceptible to deformation, and it is easier to prevent the formation of large through holes. Further, by forming the structure of the above-mentioned glass fiber woven fabric, it is possible to reduce the refraction and reflection of light incident on the transparent sheet, and it is possible to further improve the transparency before and after use in a high-temperature and high-humidity environment. A method of producing a glass fiber woven fabric as described above, for example, a glass yarn having an average filament diameter of 3.5 to 4.5 μm and a filament number of 20 to 110 is woven by a jet-type shuttleless weaving machine, regardless of the warp and weft of 80~ 120 pieces / 25mm, the tension of the glass fiber fabric is 50 to 100 N/m in the warp direction, preferably 80 to 100 N/m, and the water flow is subjected to a pressure of about 1 to 3 MPa, so that the treatment is preferably performed a plurality of times.

From the same viewpoint, it is preferable to use a glass fiber cloth woven fabric, an average filament diameter of the glass yarn constituting the woven fabric of 3.5 to 4.2 μm, a number of filaments of 45 to 110, and the weaving of the aforementioned fabric. The density is 85 to 105/25 mm, the thickness is 9 to 30 μm, and the mass is 9 to 35 g/m ² , and it is more preferable that the average filament diameter of the glass yarn constituting the aforementioned fabric is 3.5 to 4.5 μm and long. The number of silk roots is 20 to 55, and the weaving density of the aforementioned fabric is 80 to 120/25 mm, the thickness is 9 to 13 μm, and the mass is 9 to 15 g/m ² . It is particularly preferable to form the following fabrics: The average filament diameter of the glass yarn is 3.5~4.2μm, and the number of filaments is 45~55, and the weaving density of the above fabric is 85~105/25mm, the thickness is 9~13μm, the mass is 9~13g/m ² regardless of the warp and weft. .

The difference in refractive index between the glass fiber cloth 2 and the cured resin composition layer 3 is preferably 0.02 or less, more preferably 0.01 or less, still more preferably 0.005 or less. The refractive index of the glass fiber cloth 2 is preferably about 1.45 to 1.65, preferably about 1.50 to 1.60.

Further, the measurement of the refractive index of the glass fiber cloth 2 was carried out in accordance with the B method of JIS K 7142:2008. Specifically, the glass fibers of the glass cloth 2 using diiodomethane (n _D ²³ 1.747), butyl phthalate (n _D ²³ 1.491) and dimethyl carbonate (n _D ²³ 1.366) as drenches, Further, NAR-2T manufactured by ATAGO was used as an Abbe refractometer, and a sodium D line having a wavelength of 589 nm was used as a light source, and the measurement was carried out at a temperature of 23 ° C, and the average value of the five test numbers was taken as the value of the refractive index. Further, the measurement of the refractive index of the cured resin composition layer 3 was carried out in accordance with the B method of JIS K 7142:2008. Specifically, the hardened resin composition after hardening is powdered, and diiodomethane (n _D ²³ 1.747), butyl phthalate (n _D ²³ 1.491), and dimethyl carbonate (n _D ²³ 1.366) are used. In the immersion liquid, a small measuring microscope STM5-311 (manufactured by OLYMPUS, observation magnification: 400 times) was used as a microscope, and a sodium D line having a wavelength of 589 nm was used as a light source, and the temperature was measured at 23 ° C, and the average value of the five test numbers was taken as The value of the refractive index.

The Abbe number difference between the glass fiber cloth 2 and the cured resin composition layer 3 is preferably 30 or less, more preferably 20 or less, and still more preferably 10 or less. The Abbe number of the glass fiber cloth 2 is preferably 30 to 80, more preferably 40 to 70, and even more preferably 50 to 65. Further, the Abbe number of the cured resin composition and the glass fiber was measured as follows.

(Abbe number of the cured resin composition) The sheet of the cured resin composition not containing the glass fiber cloth was made into the same thickness under the same conditions as those of the glass fiber cloth, and the surface of the test piece was carefully ground to make it wide. 8mm, length 20mm, and according to JIS K 7142A method, use NAR-2T made by ATAGO as the Abbe refractometer, diiodomethane as the contact liquid, sodium D line with the wavelength of 589 nm as the light source, and the measurement temperature is 23 °C. The refractive index at a wavelength of 589 nm was measured. Next, the dispersion value was measured by using natural light as a light source, and the Abbe number was calculated by the following formula (I). Abbe number = (refractive index - 1 at wavelength 589 nm) / dispersion value (I)

(Abbe number of glass fiber) A glass sheet having a width of 8 mm, a length of 20 mm, and a thickness of 5 mm was produced using a glass material constituting the glass fiber, and the surface was carefully polished, and NAR-made by ATAGO was used in accordance with JIS K 7142A. 2T was used as an Abbé refractometer, diiodomethane as a contact liquid, and a sodium D line having a wavelength of 589 nm as a light source, and the refractive index at a wavelength of 589 nm was measured at 23 ° C. Next, the dispersion value was measured by using natural light as a light source, and the Abbe number was calculated by the above formula (I).

(Cured Resin Composition Layer 3) In the transparent sheet 1 of the present invention, the cured resin composition layer 3 is formed of a cured product of a resin composition containing a curable resin impregnated with the glass fiber cloth 2 described later. Specifically, the cured resin composition layer 3 is formed by applying energy such as light or heat to a resin composition containing a curable resin to cure the resin composition into a cured product.

From the viewpoint of further improving the transparency of the transparent sheet 1 before and after use in a high-temperature and high-humidity environment, the curable resin is preferably such that the cured resin composition layer 3 and the glass fiber cloth 2 have similar refractive indices. The curable resin is preferably a photocurable resin composition, and examples thereof include a vinyl ester resin, a urethane acrylate resin, an oxime acrylate resin, an unsaturated polyester resin, and a curable acrylic resin. , epoxy resin, etc. Among them, from the viewpoint of further improving the adhesion to the thermoplastic resin layer 4, it is particularly preferable to cure the resin composition containing the acrylic slurry. In the present invention, the acrylic slurry refers to a polymerizable liquid mixture obtained by dissolving a (meth) acrylate polymer such as polymethyl methacrylate (PMMA) in an acrylic monomer such as methyl methacrylate. The acrylic slurry is also selected from the group consisting of polymethyl methacrylate, methyl methacrylate/methyl acrylate copolymer, and methyl methacrylate/n-butyl acrylate copolymer. One or more kinds of acrylate polymers are preferably an acrylic slurry which is dissolved in a methyl methacrylate monomer. When the cured resin composition layer 3 is cured as a resin composition containing an acrylic slurry, the adhesion to the thermoplastic resin layer 4 can be further improved, so that the transparent sheet 1 can be further improved at a high temperature. It is better to use transparency before and after use in a wet environment. Further, the hardened resin composition layer 3 is preferably one which does not have a thermoplastic property.

The resin composition forming the hardened resin composition layer 3 may further contain an additive such as a hardening accelerator, a flame retardant, an ultraviolet absorber, a filler, and an antistatic agent. Examples of the flame retardant include aluminum hydroxide, magnesium hydroxide, trichloroethyl phosphate, triallyl phosphate, ammonium polyphosphate, and phosphate ester. The ultraviolet absorber may be exemplified by benzotriazole or the like. The filler may be exemplified by calcium carbonate, cerium oxide, talc or the like. The antistatic agent may be exemplified by a surfactant or the like. These additives may be used alone or in combination of two or more.

In the present invention, in order to improve the transparency of the transparent sheet 1 before and after use in a high-temperature and high-humidity environment, the refractive index of the glass fiber cloth 2 and the cured resin composition layer 3 which will be described later is made similar. From such a viewpoint, the refractive index of the cured resin composition layer 3 is preferably about 1.45 to 1.65, preferably about 1.50 to 1.60. Moreover, in order to improve the transparency of the transparent sheet 1 before and after use in a high-temperature and high-humidity environment, it is preferable to set the Abbe number of the glass fiber cloth 2 and the cured resin composition layer 3 which will be described later to be similar. From such a viewpoint, the Abbe number of the cured resin composition layer 3 is preferably from 30 to 70, more preferably from 40 to 60.

In the transparent sheet 1 of the present invention, the quality of the cured resin composition layer 3 is exemplified by 20 to 100 g/m ² , and the transparency and incombustibility before and after use in a high-temperature and high-humidity environment are considered. A preferred example is 20 to 50 g/m ² . Further, the thickness of the cured resin composition layer is, for example, 20 to 130 μm, and is preferably 30 to 60 μm from the viewpoint of transparency and incombustibility before and after use in a high-temperature and high-humidity environment.

In the transparent sheet 1 of the present invention, the weight ratio of the glass fiber cloth 2 to the cured resin composition layer 3 is compared with the glass fiber cloth from the viewpoints of transparency and incombustibility before and after use in a high-temperature and high-humidity environment. 2, the total mass of the cured resin composition layer 3, the mass ratio of the glass fiber cloth 2 is preferably 5 to 50% by mass, preferably 10 to 35% by mass, more preferably 10 to 25% by mass. Moreover, the ratio of the total mass of the transparent sheet 1 (i.e., the mass of the peelable cover material 5) after the peelable cover material 5 which has been peeled off after use of the glass cloth 2 (= the quality of the glass cloth 2) (g)/Removal of the mass (g) × 100 (%) of the peelable cover material 5, for example, 3 to 20% by mass, preferably 3 to 15% by mass, and preferably 3 to 10% by mass.

(Thermoplastic Resin Layer 4) In the transparent sheet 1 of the present invention, the thermoplastic resin layer 4 is laminated on the hardened resin composition layer 3 impregnated with the glass fiber cloth 2, and the transparent sheet 1 is kept transparent after long-term use in a high-temperature and high-humidity environment. Sexuality and achieve the effect of increasing the initial tear strength.

The thermoplastic resin layer 4 contains a thermoplastic resin other than the polyvinyl chloride resin. The thermoplastic resin other than the polyvinyl chloride resin is preferably an example in which the amount of the plasticizer is small or thin, and a biaxially stretched film containing an amorphous thermoplastic resin other than the polyvinyl chloride resin is preferable. The thermoplastic resin other than the polyvinyl chloride resin may be exemplified by a polyester resin, a polycarbonate resin, and a polyamide resin, and may contain at least one of these. Further, the thermoplastic resin layer 4 may be one which does not contain a polyvinyl chloride resin. From the viewpoint of the fact that the initial tear strength of the transparent sheet 1 is more excellent, the thermoplastic resin layer 4 can be exemplified by an Emmendorf tear growth resistance of 1 N/mm or more in the longitudinal direction and the lateral direction. 3 to 20 N/mm is preferred, and 5 to 15 N/mm is preferred. Among them, the thermoplastic resin layer 4 is preferably composed of a polyester resin from the viewpoint of more chemical resistance (including an alkali-resistant detergent when used as a smoke-proof wall), an increase in initial tear strength, and transparency. . The polyester resin may be exemplified by polyethylene terephthalate (PET) or polyethylene naphthalate (PEN). Furthermore, the Emendoff tear growth resistance means that the tear strength (N) is measured according to JIS K7128-2×1998 using the Emendorf tearing machine manufactured by Toyo Seiki Co., Ltd., and is divided by the measured value. The tear growth resistance (N/mm) was obtained after the film thickness. Further, the tear strength is an average value of test results of 20 samples in the longitudinal direction and the transverse direction. The content of the plasticizer in the thermoplastic resin layer 4 is, for example, 10% by mass or less, preferably 5% by mass or less, preferably 3% by mass or less, more preferably 1% by mass or less, and most preferably 0.5% by mass or less. The plasticizer is exemplified by a plasticizer of a vinyl chloride resin, such as di-n-butyl phthalate, di-n-octyl phthalate, and di-2-ethylhexyl phthalate. , diisooctyl phthalate, dioctyl decyl phthalate, diisononyl phthalate, butyl benzyl phthalate, di-2-ethylhexyl isophthalate, etc. Fatty acid ester plasticizer such as plasticizer, 2-ethylhexyl adipate, di-2-nonyl adipate, dibutyl sebacate and 2-ethylhexyl sebacate , phosphate ester plasticizer such as tributyl phosphate, tri-2-ethylhexyl phosphate, 2-ethylhexyl diphenyl phosphate, tricresyl phosphate, tri-2-ethylhexyl trimellitate Polyester-based plasticizers such as esters and trioctyl trimellitate, plasticizers such as adipic acid-based polyester plasticizers and phthalic acid-based polyester plasticizers, and terephthalic acid Formic acid plasticizer.

The thermoplastic resin layer 4 may be subjected to surface treatment such as corona treatment, flame treatment, or plasma treatment, and may be provided with a coating for imparting various functions such as slipperiness and easy adhesion, and improving wear resistance. Hard coating, etc.

In the transparent sheet 1 of the present invention, the mass of each layer of the thermoplastic resin layer 4 can be, for example, 30 to 150 g/m ² , and 50 to 90 g/ from the viewpoint of both initial tear strength and incombustibility. Preferably, m ^{2 is} preferably 60 to 80 g/m ² . Further, the thickness of the thermoplastic resin layer 4 is, for example, 20 to 100 μm, and more preferably 30 to 70 μm, and preferably 40 to 60 μm from the viewpoint of having both initial tear strength and nonflammability. Further, for example, when the thermoplastic resin layer 4 is laminated to provide a coating of various functions such as slipperiness, easy adhesion, and antistatic property, and/or other layers such as a hard coat layer for improving wear resistance, the other layers are The thickness can be 0.1 to 3 μm as an example, and preferably 0.1 to 1 μm. The film of the thermoplastic resin layer 4 is preferably excellent in transparency and smoothness. The transparency of the film of the thermoplastic resin layer 4 is preferably 90% or more in total light transmittance (JIS K 7105: 1981), and preferably 91 to 98%. Further, for example, the haze (JIS K 7105:1981) is preferably 1.5% or less, and preferably 0.3 to 1.0%.

(Releasable Covering Material 5) The peelable covering material 5 which is peeled off when the surface of the thermoplastic resin layer 4 is laminated on the surface of the thermoplastic resin layer 4 as needed may be used as needed. Thus, for example, when the transparent sheet 1 of the present invention is used as a smoke preventing wall, it is possible to prevent the transparent sheet 1 from being scratched or the like during construction, resulting in deterioration of transparency or aesthetics.

Further, as described above, for example, the covering material 5 is installed by the building reference method when it is required to install the smoke preventing vertical wall, for example, after the end of the smoke preventing wall installation work (in other words, as a smoke preventing vertical wall) When) peeled off. On the other hand, when the cover material 5 is peeled off, the thermoplastic resin layer 4 is rubbed against the cover material 5, and the thermoplastic resin layer 4 is electrostatically charged. It is understood that dust or the like existing in the air adheres to the smoke prevention. Wall surface. Therefore, when the peelable cover material 5 is peeled off when the surface of the thermoplastic resin layer 4 is laminated, at least the surface side of the thermoplastic resin layer 4 contains an antistatic agent, and the static electricity generated by peeling off the cover material 5 can be further suppressed. It is preferable to easily maintain the transparency of the transparent sheet 1 excellent.

For the peelable cover material 5, for example, a polyethylene film, a polytetrafluoroethylene film, a polypropylene film, a surface-treated paper, or the like can be used, and the cover material 5 and the thermoplastic resin layer 4 are used as long as the cover material 5 is peeled off. Then, the force is smaller than the adhesive force of the thermoplastic resin layer 4 and the cured resin composition layer 3. In the case where the light-transmitting cover material is used as the peelable cover material 5, for example, when the resin composition forming the cured resin composition layer 3 is a photocurable cured resin composition, even if the hardened resin composition is cured In the step of hardening the resin composition, it is also preferable to prevent the thermoplastic resin layer 4 from being scratched or the like, resulting in a decrease in transparency or aesthetics. The light transmittance is not particularly limited as long as it can penetrate light that cures the photocurable resin, and examples thereof include those that can penetrate light having a wavelength of 100 to 400 nm and can penetrate light having a wavelength of 250 to 400 nm. The light transmittance of the coating material is measured by, for example, a UV transmittance measuring instrument (trade name: UV3150 manufactured by Shimadzu Corporation), and the average transmittance between the measurement wavelengths of 250 to 400 nm is preferably 40% or more. More than 50% is preferred, and more preferably 60% or more. Further, the peelable cover material 5 which is peeled off during use is peeled off during use, for example, by a smoke-proof wall, and thus transparency and smoothness are not particularly limited. For example, from the viewpoint of cost, the total light transmittance is about 80 to 95% (JIS K 7105: 1981), and the haze is about 2 to 10% (JIS K 7105: 1981).

(Antistatic layer 6) As shown in Fig. 3, in the transparent sheet 1 of the present invention, between the peelable cover material 5 which is peeled off during use and the thermoplastic resin layer 4, for example, a metal or a metal compound may be laminated. The antistatic layer 6 is disposed such that the transparent sheet of the present invention becomes a surface layer when used as a smoke preventing wall. For example, when the transparent sheet 1 of the present invention is used as a smoke preventing wall, it is preferable to use a coverable peelable covering material 5 from the viewpoint of improving the rationality at the time of construction. Further, for example, when the smoke prevention wall is installed in a large facility such as a shopping mall, the cover material 5 is peeled off in accordance with the operation of the large facility (that is, when used as a smoke prevention wall). On the other hand, when the cover material 5 is peeled off, the thermoplastic resin layer 4 is rubbed against the cover material 5, and the thermoplastic resin layer 4 is electrostatically charged. It is understood that dust or the like existing in the air adheres to the smoke prevention. Wall surface. Therefore, by including the antistatic layer 6 on the surface side of the thermoplastic resin layer 4, the static electricity generated by the peeling of the cover material 5 can be further suppressed, and the excellent transparency after the completion of the production of the transparent sheet 1 can be easily maintained.

The antistatic agent contained in the antistatic layer 6 can be used, and examples thereof include various cationic groups having a cationic group such as a fourth-order ammonium salt, a pyridinium salt, and a first- to third-order amine group. Antistatic agent; anionic antistatic agent having an anionic group such as a sulfonate group, a sulfate group, a phosphate group or a phosphonate group; an amphoteric antistatic agent such as an amino acid or an amine sulfate Various surfactant-type antistatic agents such as a nonionic antistatic agent such as an amino alcohol, a glycerin or a polyethylene glycol; and a polymer antistatic having a high molecular weight antistatic agent as described above; An inorganic antistatic agent such as a silver, tin oxide or zinc oxide. Further, a monomer or oligomer having a third-order amine group or a fourth-order ammonium group and polymerizable by free radiation, for example, N,N-dialkylaminoalkyl (meth)acrylic acid, may also be used. A polymerizable antistatic agent such as an ester monomer or a fourth-order compound. Among them, it is preferable that the antistatic layer 6 contains a metal or a metal compound. Thereby, the surface resistivity of the transparent sheet 1 of the present invention can be further reduced, and the change in surface resistivity of the transparent sheet 1 after use in a high-temperature and high-humidity environment can be further reduced. In other words, when the antistatic layer 6 contains a metal or a metal compound, the overflow of the antistatic agent is further suppressed, and the above effects can be achieved.

The antistatic layer 6 containing a metal or a metal compound may be exemplified by Ag, Ni, Cu, Sn, Sb, Al, In, Ti, etc., and may be referred to as a standard electrode after a metal monomer. For example, a metal element having a potential of less than 0 eV is used. The metal compound may, for example, be a metal oxide (ruthenium pentoxide, tin oxide, zinc oxide, indium oxide, antimony-doped indium oxide, tin-doped indium oxide, silver oxide, or the like). Further, the antistatic layer 6 may be formed of fine particles not composed of barium sulfate, calcium carbonate, alumina, magnesium citrate, glass or the like. The form of the metal or metal compound may be, for example, a film of a metal or a metal compound by vapor deposition, sputtering, plating, or the like, or a layer in which fine particles of a metal or a metal compound are dispersed in a fixing resin. The shape of the metal or metal compound fine particles may be exemplified by a granular form, a flake form, or a needle form (fibrous form). The average particle diameter of the metal or metal compound fine particles is, for example, an average particle diameter determined by a BET method (the specific surface area (m ² /g) measured by a nitrogen gas adsorption method is calculated by a usual method as a specific surface diameter as an average The particle diameter) is 100 nm or less below the visible light wavelength, preferably 1 to 100 nm, and it is easier to maintain the transparency of the transparent sheet 1.

When the antistatic layer 6 containing a metal or a metal compound is a metal or metal compound fine particle, it is preferable to include a fixing resin which fixes the metal or metal compound fine particles to the substrate. That is, the antistatic layer 6 is preferably a layer containing a fixing resin and fine particles of metal or metal compound dispersed in the anchor resin. Examples of the anchor resin include a polyurethane resin, a polyester resin, an acrylic resin, a polyether resin, a cellulose resin, a polyvinyl alcohol resin, an epoxy resin, and a polyvinylpyrrolidone. Polystyrene resin, polyethylene glycol, neopentyl alcohol, etc., particularly preferably a polyurethane resin, a polyester resin, or an acrylic resin. The acrylic resin may be, for example, a modified acrylic resin (a urethane modification, a polyester modification, a polycarbonate modification, a fluorine modification, or the like). The quality of the antistatic layer 6 may be, for example, 0.1 to 10 g/m ² per layer and 0.1 to 5 g/m ² , from the viewpoint of the surface resistivity and transparency of the transparent sheet 1 . It is preferably 0.1 to 3 g/m ^{2 and more} preferably 0.1 to 1 g/m ² . Further, a metal or a metal compound may be present on the surface of the thermoplastic resin layer 4. Further, the thickness of the antistatic layer 6 is, for example, 0.01 to 3 μm per layer, and preferably 0.05 to 1 μm. The mass ratio of the fixing resin to the metal or metal compound fine particles in the antistatic layer 6 (the mass of the fixing resin (g/m ² ): the mass of the metal or metal compound fine particles (g/m ² )), and the transparent sheet From the viewpoint of surface resistivity and transparency of the material 1, it is preferably 10:1 to 1:1, preferably 8:1 to 2:1, and particularly preferably 4:1 to 2:1. Further, the surface smoothness when the antistatic layer 6 containing a metal or a metal compound is provided is, for example, a surface roughness Ra of 1 to 200 nm. Further, with respect to the total mass of the antistatic layer 6 (g / m ^2), and the metal mass of the metal compound fine particles (g / m ²⁾ may be cited as the ratio of 50 to 10% by mass, and at preferably 30 to 20 mass% .

(Physical Properties and Properties of Transparent Sheet 1) Regarding the thickness of the transparent sheet 1 of the present invention, for example, the thickness of the transparent sheet 1 after peeling off the peelable cover material 5 at the time of peeling off (i.e., removal of peelable cover) The thickness of the material 5 is preferably from 100 to 300 μm and preferably from 150 to 200 μm. Further, regarding the quality of the transparent sheet 1 of the present invention, for example, the quality of the transparent sheet 1 after peeling off the peelable cover material 5 at the time of use (that is, the quality of the peelable cover material 5 is removed) is It is preferably 100 to 400 g/m ² and preferably 150 to 300 g/m ² . Further, in the transparent sheet 1 of the present invention, the total mass of the cured resin composition layer and the thermoplastic resin layer is 150 to 300 g/m ² , preferably 150 to 200 g/m ² , so that it is easier to have incombustible Sex and tear strength, so it is better.

In the transparent sheet 1 of the present invention, the thickness of the glass fiber cloth is 8 to 30 μm, and since the thermoplastic resin layer 4 is laminated, it can be used as a high transparency before and after use in a high-temperature and high-humidity environment. From the viewpoint of ensuring high transparency before and after use in a high-temperature and high-humidity environment, the total light transmittance of the transparent sheet 1 of the present invention before use in a high-temperature and high-humidity environment may be, for example, 85% or more, for example, 90% or more. It is better. Further, the haze of the transparent sheet 1 of the present invention before use in a high-temperature and high-humidity environment is 5% or less, preferably 3% or less, more preferably 1% or less. The total light transmittance and haze of the transparent sheet 1 are respectively measured by JIS K7375 2008 "Method for obtaining plastic - total light transmittance and total light reflectance".

As described above, in order to ensure high transparency before use in a high-temperature and high-humidity environment, in addition to the thickness of the glass fiber cloth being 8 to 30 μm, for example, the glass fiber cloth 2 and the cured resin composition layer 3 may be further reduced. The refractive index difference is set; the glass fiber cloth is set as a fabric, and the average filament diameter of the glass yarn constituting the fabric is 3.5 to 4.5 μm, and the number of filaments is 20 to 55, and the weaving density of the fabric is 80 to 120 regardless of the warp and weft. The root is 25 mm, the thickness is 9 to 15 μm, and the mass is 9 to 15 g/m ² ; and the cured resin composition layer 3 is obtained by curing the resin composition containing the acrylic slurry.

The total light transmittance of the transparent sheet 1 of the present invention after use in a high-temperature and high-humidity environment can be, for example, that the transparent sheet 1 has a total light transmittance of 85% or more after the following accelerated test, and is 90% or more. good. Moreover, the haze of the transparent sheet 1 of the present invention after use in a high-temperature and high-humidity environment is, for example, a haze of the transparent sheet 1 after the following accelerated test is 5% or less, and preferably 3% or less. 1% or less is preferred. (Promotion test method) The transparent sheet was placed in a constant temperature and humidity machine and heated in a humidified environment at 50 ° C and a humidity of 90% for 7 days, after drying and natural cooling, by JIS K7375 2008 "Plastic - Total Light Transmittance And the method of calculating the total light reflectance" is measured.

As described above, in order to ensure high transparency after use in a high-temperature and high-humidity environment, in addition to the above-described method for ensuring high transparency before use in a high-temperature and high-humidity environment, and the thermoplastic resin layer 4 is made of a thermoplastic resin other than a polyvinyl chloride resin. In addition, the amount of the plasticizer contained in the thermoplastic resin layer 4 can be reduced.

In the transparent sheet 1 of the present invention, since the thermoplastic resin layer 4 is provided, the initial tear strength can be made high. From the viewpoint of ensuring high initial tear strength, the initial tear strength is preferably 30 to 100 (N), preferably 40 to 100 (N), and more preferably 50 to 100 (N). In the present invention, the initial tear strength is measured and calculated as follows. (Test method) According to the C method (trapezoidal method) of 7.16 of JIS R 3420:2013, a test piece of 75 mm × 150 mm in the longitudinal direction and the lateral direction was taken from the transparent sheet, and two trapezoidal portions including a right angle (equivalent to The tape on the both sides of the trapezoidal part A shown in Fig. 4 is attached with a tape for slippage (product name 600S manufactured by Sekisui Chemical Co., Ltd.), and a fixed-speed load type tensile type is used without drawing a cutting line. The test machine (trade name RTC-1310A, manufactured by ORIENTEC Co., Ltd.) was carried out to measure the maximum load, and the average value of the longitudinal maximum load and the lateral maximum load (= (longitudinal maximum load (N) + lateral maximum load (N)) / 2 ) as the initial tear strength (N).

Since the transparent sheet 1 of the present invention contains the glass cloth 2, it can have nonflammability properties (nonflammability). In addition, the non-combustibility of the transparent sheet 1 of the present invention is based on the "anti-fire resistance performance test (evaluation business method book) of the "Construction Business Method Book" (alternative version changed on March 1, 26) of the General Building Corporation's Building Materials Testing Center. Test × Evaluation method: In the heat test for irradiating the surface of the sheet with radiant heat of 50 kW/m ² from the radiant electric heater, the maximum heat generation rate after the start of heating lasts for 10 seconds or more, does not exceed 200 kW/m ² , and the total heat is generated. The amount is preferably 8 MJ/m ² or less. To further improve the incombustibility, for example, the addition of the flame retardant or the reduction of the amount of the organic substance can be carried out in the cured resin composition layer 3 and the thermoplastic resin layer 4.

The surface resistivity of the transparent sheet 1 of the present invention is preferably 1 × 10 ¹¹ Ω or less, more preferably 1.0 × 10 ¹⁰ Ω or less, and most preferably 5.0 × 10 ⁹ Ω or less. Further, the surface resistivity is such that the transparent sheet is placed in a temperature of 23 ° C and a relative humidity of 50% RH for 15 minutes, and the measuring device is made of Agilent Technologies Co., Ltd. according to JIS K 6911 1995 5.13.2 resistivity. The high resistance meter 4339B was measured with an applied voltage of 100 V × 1 minute.

(Method for Producing Transparent Sheet of the Present Invention) The method for producing the transparent sheet 1 of the present invention is not particularly limited, and the following production method can be exemplified. First, the glass fiber cloth 2 and the aforementioned uncured hard resin composition constituting the cured resin composition layer 3 are prepared. The cured resin composition is applied to a film (for example, a polyester film or the like) as the thermoplastic resin layer 4, and the glass fiber cloth 2 is placed on the cured resin composition to impregnate the glass fiber cloth 2 with the hardened resin composition, further And placing another film as the thermoplastic resin layer 4 on the glass fiber cloth 2, and applying pressure from the respective surfaces of the two films to make the hardened resin composition more impregnated into the glass fiber cloth 2, Heating or light irradiation hardens the hardened resin composition to obtain a transparent sheet 1 which is impregnated with the glass fiber cloth 2 through the hardened resin composition layer 3 and which is laminated with thermoplastic on the hardened resin composition layer 3. In the resin layer 4, the thermoplastic resin layer 4/the transparent sheet 1 of the cured resin composition layer 3/the thermoplastic resin layer 4 contained in the state in which the glass fiber cloth 2 is impregnated is sequentially laminated.

When the resin composition is hardened by heat application, the heating temperature is not particularly limited and may be, for example, about 50 to 200 °C. Further, when the resin composition is cured by imparting light, the resin composition is irradiated with light to be cured. The condition of the irradiation light can be, for example, a cumulative light amount of 100 to 500 mJ/cm ² .

Further, for example, when the antistatic layer 6 is provided on the surface side of the thermoplastic resin layer 4, an antistatic agent may be applied after the transparent sheet 1 is produced, or the film as the thermoplastic resin layer 4 may be subjected to an antistatic treatment. Further, when the transparent sheet 1 of the present invention is formed on the surface of the thermoplastic resin layer 4 and the peelable cover material 5 is peeled off during use, the cover sheet 5 can be laminated after the transparent sheet 1 is obtained. In addition, the peelable cover material 5 is laminated on the film which is the thermoplastic resin layer 4, and the both are integrated, and the uncured hardened resin composition is applied to the surface of the thermoplastic resin layer 4 so that the cover material 5 is located outside. And the glass fiber cloth 2 is placed on the hardened resin composition, the hardened resin composition is impregnated into the glass fiber 2, and further, another peelable cover material 5 is laminated in advance to the film as the thermoplastic resin layer 4. The two are integrated, and the cover material 5 is placed on the outer side of the glass cloth 2, and pressure is applied from the surface of each of the two films (that is, the surface of the cover material 5) to form a hardened resin. The material is further impregnated into the glass fiber cloth 2, and the hardened resin composition is hardened by heating or light irradiation to obtain a transparent sheet 1, which is a glass fiber cloth 2 which is hardened by the hardened resin composition layer 3. A layer of the thermoplastic resin layer 4 is laminated on the hardened resin composition layer 3, and a peelable cover material 5 is laminated on the thermoplastic resin layer 4 (the peelable cover material 5 / thermoplastic resin layer 4 / layer is sequentially laminated) Fiberglass cloth permeable cover material 4 contained therein / peelable hardening of the resin composition layer 3 / the thermoplastic resin layer of the transparent sheet 5 1) 2 of state.

Moreover, the method for producing a transparent sheet of the present invention may be a method for producing a transparent sheet comprising: a glass fiber cloth, and a photocurable resin composition contained therein in a state in which the glass fiber cloth is impregnated a layer and a thermoplastic resin layer laminated on the photocurable resin composition layer; the method for producing the transparent sheet comprises the following steps: Step A, preparing at least two light transmissive thermoplastic resins laminated with a light transmissive covering material And the step B, by the two thermoplastic resin films obtained in the above step A, the light-hardening resin composition impregnated with the glass fiber cloth and the uncured light curing resin composition is placed on the outer side of the light-transmitting covering material, and In this state, the uncured photocurable resin composition is irradiated with light to cure the uncured photocurable resin composition.

(Use of Transparent Sheet of the Present Invention) The use of the transparent sheet of the present invention can be exemplified by the smoke preventing wall. The smoke-proof vertical wall is exemplified by a transparent sheet using a glass cloth and a resin. For example, a smoke-proof wall has a mounting rail disposed on a ceiling surface of a building, and an upper end portion is maintained in the foregoing installation. a transparent sheet suspended from the rail and a pair of end mullions disposed on both sides of the transparent sheet, the transparent sheet being joined to the end stile and freely separable. In the case where the outermost layer of the transparent sheet of the present invention is a thermoplastic resin layer 4 when used as a smoke preventing wall, it can be applied to a tension type smokeproof vertical wall because it can be subjected to high-frequency welding. In the present invention, the tension type smoke preventing vertical wall is a vertical wall formed by erecting a transparent non-combustible sheet between two pairs of mullion frames, and the lower side of the transparent non-combustible sheet is not provided with a beam when suspended from the ceiling. Take the smoke-proof vertical wall as an example. Moreover, since it can replace glass, it is also suitable for other uses in which glass is used, for example, a separator, a partition, a smoke-proof sheet, a smoke-proof cloth screen (for example, a user such as a factory), a touch panel, or the like. In addition, when the mass of the curable resin composition layer 3 is, for example, 20 to 100 g/m ² , preferably 20 to 50 g/m ² , the transparency of the transparent sheet 1 of the present invention is more excellent. Therefore, it is easy to be used as a roll product. The length of the roll-shaped product in the longitudinal direction may be, for example, 5 to 300 m. [Examples]

Hereinafter, the present invention will be described in detail by way of examples and comparative examples. However, the invention is not limited by the examples.

The hardened resin composition constituting the hardened resin composition layer 3 of the impregnated glass fiber cloth described above is a composition of Table 1, and an acrylic slurry is used (the product name "ACRYSIRUP" is mixed with a mass ratio of 1:1. XD-8005" (refractive index: 1.550) and "ACRYSIRUP XD-8006" (refractive index: 1.570), vinyl ester resin (manufactured by U-Pica Co., Ltd., Japan), styrene monomer (manufactured by U-Pica Co., Ltd., Japan) a mixture of a bifunctional (meth) acrylate and a photopolymerization initiator. In addition, as the bifunctional (meth) acrylate of the curing agent, NPGDA (neopentylene glycol diacrylate, molecular weight 212, (manufactured by U-Pica Co., Ltd., Japan)) described in Table 1 was used. In addition, the amount of the photopolymerization initiator is 2 parts by mass based on 100 parts by mass of the total of the vinyl ester resin, the styrene monomer, and the bifunctional (meth) acrylate. For the thermoplastic resin layer 4, a 2-axis stretch polyester film (trade name "COSMOSHINE (registered trademark) A4300" manufactured by Toyobo Co., Ltd., a thickness of 50 μm, a mass of 70 g/m ² , and a total light transmittance (JIS K 7105) was used. : 1981) 93%, haze (JIS K 7105: 1981) 0.9%), vinyl chloride resin, commercially available vinyl chloride resin film (manufactured by Okamoto Co., Ltd., generally PVC #320, thickness 100 μm, mass 120 g/ m ² ). The peelable cover material 5 is an adhesive film using a polypropylene film (thickness: 40 μm, mass: 36 g/m ² ), and a peelable cover material is peelably adhered to the thermoplastic resin layer, and an acrylate-based adhesive is used. Further, the peelable cover material 5 was a PET film (thickness: 50 μm, total light transmittance: 93%, haze: 4%). Further, an antistatic layer 6 is provided by applying and drying an antistatic agent to one surface of COSMOSHINE (registered trademark) A4300 as the thermoplastic resin layer 4, and the antistatic agent is a tin oxide fine particle (average particle diameter). 20 nm) was mixed and dispersed in a polyester resin as a fixing resin, and the mass ratio of the fixing resin to the tin oxide fine particles (fixing resin: tin oxide fine particles) was 75:25. The mass of the antistatic layer 6 after the setting was 0.5 g/m ² and the thickness was 0.4 μm.

<Example 1> (Production of Glass Fiber Cloth 2) The warp yarn and the weft yarn were manufactured under the trade name "ECBC3000 1/0 0.5Z" manufactured by UNITAKA GLASS FIBER Co., Ltd. (average filament diameter 4 μm, average filament number 50, The number of turns is 0.5Z), which is woven by a jet-type shuttleless loom to obtain a plain woven fiberglass fabric having a warp density of 95/25 mm and a weft density of 95/25 mm. Next, the spinning sizing agent and the woven sizing agent adhering to the obtained glass fiber woven fabric were removed by heating at 400 ° C for 30 hours. Thereafter, the surface treatment agent decane coupling agent (S-350: N-vinylphenyl-aminoethyl-γ-aminopropyltrimethoxydecane (hydrochloride) Chisso Co., Ltd.) was adjusted to 15 g/ The concentration of L was squeezed by a dipper roll and dried at 120 ° C for 1 minute. Further, the glass fiber fabric was subjected to a water flow treatment at a pressure of 1.5 MPa, and the tension of the glass fiber woven fabric was subjected to a widening treatment in the warp direction of 100 N/m twice to obtain a glass fiber woven fabric. The obtained glass fiber woven fabric had a warp density of 95 pieces/25 mm, a weft density of 95 pieces/25 mm, a thickness of 13 μm, a mass of 12 g/m ² , and a refractive index of 1.561.

(The cover material which can be peeled off in the thermoplastic resin laminated layer) The polypropylene film which is the peelable cover material 5 peeled off at the time of use is laminated with the acrylate-based adhesive, and is dried on the one surface to be provided with antistatic. On the antistatic layer 6 of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4 of the layer 6, the adhesive is placed on the side of the antistatic layer 6, and the peelable cover material 5/acrylic acid 6 which is peeled off during use is obtained. The ester-based adhesive/antistatic layer 6/the laminated structure layer A of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4. Two sheets of the laminate A were prepared.

(Production of Transparent Sheet) The surface of the COSMOSHINE (registered trademark) A4300 of the laminate A obtained as described above (that is, the side opposite to the peelable cover material 5 peeled off from use) is applied as a cured resin composition. The cured resin composition described in Table 1 of Layer 3. Next, the glass fiber cloth 2 obtained above was placed on the cured resin composition as the cured resin composition layer 3, and allowed to stand for 1 minute to impregnate the gap between the glass fiber cloth 2 and the cured resin composition. Then, the laminated body A obtained as described above is applied to the surface of the COSMOSHINE (registered trademark) A4300 of the laminated body A (that is, the side opposite to the peelable covering material 5 peeled off from use). The three-side method was placed, and the weight of the cured resin composition layer 3 was 40 g/m ^{2 by} pressurization from the layered body A. After that, the hardened resin composition as the cured resin composition layer 3 is irradiated with light using a black fluorescent lamp (trade name: FL15BLB, manufactured by Toshiba Co., Ltd.) in a state in which the peelable cover material 5 is peeled off during use. (Light irradiation condition: cumulative light amount: 200 mJ/cm ² ), the cured resin composition was cured to form a hardened resin composition layer 3, and a laminated structure as shown in FIG. 3 was obtained (the peelable cover material 5 peeled off in use) /Acrylate-based adhesive/antistatic layer 6/thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) which can be peeled off together with the cover material 5/hardened resin composition contained therein in the state in which the glass fiber cloth 2 is impregnated Material layer 3 / thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) / antistatic layer 6 / acrylate adhesive which can be peeled off together with the cover material 5 / transparent sheet of the peelable cover material 5) peeled off during use material. In the obtained transparent sheet, the cured resin composition layer 3 (hardened product of the resin composition) is impregnated into the gap between the glass fibers of the glass fiber cloth, and the hardened resin composition layer 3 is formed on both surfaces of the glass fiber cloth layer. .

<Example 2> (Production of Glass Fiber Cloth 2) The warp yarn and the weft yarn were manufactured under the trade name "ECBC3000 1/0 0.5Z" manufactured by UNITAKA GLASS FIBER Co., Ltd. (average filament diameter 4 μm, average filament number 50, The number of turns is 0.5Z), which is woven by a jet-type shuttleless loom to obtain a plain woven fiberglass fabric having a warp density of 95/25 mm and a weft density of 95/25 mm. Next, the spinning sizing agent and the woven sizing agent adhering to the obtained glass fiber woven fabric were removed by heating at 400 ° C for 30 hours. Thereafter, the surface treatment agent decane coupling agent (S-350: N-vinylphenyl-aminoethyl-γ-aminopropyltrimethoxydecane (hydrochloride) Chisso Co., Ltd.) was adjusted to 15 g/ The concentration of L was squeezed by a dipper roll and dried at 120 ° C for 1 minute. Further, the glass fiber fabric was subjected to a water flow treatment at a pressure of 1.5 MPa, and the tension of the glass fiber woven fabric was subjected to a widening treatment in the warp direction of 100 N/m twice to obtain a glass fiber woven fabric. The obtained glass fiber woven fabric had a warp density of 95 pieces/25 mm, a weft density of 95 pieces/25 mm, a thickness of 13 μm, a mass of 12 g/m ² , and a refractive index of 1.561.

(The cover material which can be peeled off in the thermoplastic resin laminated layer) The polypropylene film which is the peelable cover material 5 peeled off at the time of use is laminated with the acrylate-based adhesive, and is dried on the one surface to be provided with antistatic. On the antistatic layer 6 of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4 of the layer 6, the adhesive is placed on the side of the antistatic layer 6, and the peelable cover material 5/acrylic acid 6 which is peeled off during use is obtained. The ester-based adhesive/antistatic layer 6/the laminated structure layer A of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4. Two sheets of the laminate A were prepared.

(Production of Transparent Sheet) The surface of the COSMOSHINE (registered trademark) A4300 of the laminate A obtained as described above (that is, the side opposite to the peelable cover material 5 peeled off from use) is applied as a cured resin composition. The cured resin composition described in Table 1 of Layer 3. Next, the glass fiber cloth 2 obtained above was placed on the cured resin composition as the cured resin composition layer 3, and allowed to stand for 1 minute to impregnate the gap between the glass fiber cloth 2 and the cured resin composition. Then, the laminated body A obtained as described above is applied to the surface of the COSMOSHINE (registered trademark) A4300 of the laminated body A (that is, the side opposite to the peelable covering material 5 peeled off from use). The three-side method was placed, and the weight of the cured resin composition layer 3 was 40 g/m ^{2 by} pressurization from the layered body A. After that, the hardened resin composition as the cured resin composition layer 3 is irradiated with light using a black fluorescent lamp (trade name: FL15BLB, manufactured by Toshiba Co., Ltd.) in a state in which the peelable cover material 5 is peeled off during use. (Light irradiation condition: cumulative light amount: 200 mJ/cm ² ), the cured resin composition was cured to form a hardened resin composition layer 3, and a laminated structure as shown in FIG. 3 was obtained (the peelable cover material 5 peeled off in use) /Acrylate-based adhesive/antistatic layer 6/thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) which can be peeled off together with the cover material 5/hardened resin composition contained therein in the state in which the glass fiber cloth 2 is impregnated Material layer 3 / thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) / antistatic layer 6 / acrylate adhesive which can be peeled off together with the cover material 5 / transparent sheet of the peelable cover material 5) peeled off during use material. In the obtained transparent sheet, the cured resin composition layer 3 (hardened product of the resin composition) is impregnated into the gap between the glass fibers of the glass fiber cloth, and the hardened resin composition layer 3 is formed on both surfaces of the glass fiber cloth layer. .

<Example 3> (Production of Glass Fiber Cloth 2) The warp yarn and the weft yarn were manufactured under the trade name "ECBC3000 1/0 0.5Z" manufactured by UNITAKA GLASS FIBER Co., Ltd. (average filament diameter 4 μm, average filament number 50, The number of turns is 0.5Z), which is woven by a jet-type shuttleless loom to obtain a plain woven fiberglass fabric having a warp density of 95/25 mm and a weft density of 95/25 mm. Next, the spinning sizing agent and the woven sizing agent adhering to the obtained glass fiber woven fabric were removed by heating at 400 ° C for 30 hours. Thereafter, the surface treatment agent decane coupling agent (S-350: N-vinylphenyl-aminoethyl-γ-aminopropyltrimethoxydecane (hydrochloride) Chisso Co., Ltd.) was adjusted to 15 g/ The concentration of L was squeezed by a dipper roll and dried at 120 ° C for 1 minute to obtain a glass fiber fabric (i.e., no widening treatment was performed). The obtained glass fiber woven fabric had a warp density of 95 pieces/25 mm, a weft density of 95 pieces/25 mm, a thickness of 15 μm, a mass of 12 g/m ² , and a refractive index of 1.561.

(The cover material which can be peeled off in the thermoplastic resin laminated layer) The polypropylene film which is the peelable cover material 5 peeled off at the time of use is laminated with the acrylate-based adhesive, and is dried on the one surface to be provided with antistatic. On the antistatic layer 6 of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4 of the layer 6, the adhesive is placed on the side of the antistatic layer 6, and the peelable cover material 5/acrylic acid 6 which is peeled off during use is obtained. The ester-based adhesive/antistatic layer 6/the laminated structure layer A of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4. Two sheets of the laminate A were prepared.

(Production of Transparent Sheet) The surface of the COSMOSHINE (registered trademark) A4300 of the laminate A obtained as described above (that is, the side opposite to the peelable cover material 5 peeled off from use) is applied as a cured resin composition. The cured resin composition described in Table 1 of Layer 3. Next, the glass fiber cloth 2 obtained above was placed on the cured resin composition as the cured resin composition layer 3, and allowed to stand for 1 minute to impregnate the gap between the glass fiber cloth 2 and the cured resin composition. Then, the laminated body A obtained as described above is applied to the surface of the COSMOSHINE (registered trademark) A4300 of the laminated body A (that is, the side opposite to the peelable covering material 5 peeled off from use). On the 3 side, the mass of the cured resin composition layer 3 was 40 g/m ^{2 by} pressurization from the laminate A. After that, the hardened resin composition as the cured resin composition layer 3 is irradiated with light using a black fluorescent lamp (trade name: FL15BLB, manufactured by Toshiba Co., Ltd.) in a state in which the peelable cover material 5 is peeled off during use. (Light irradiation condition: cumulative light amount: 200 mJ/cm ² ), the cured resin composition was cured to form a hardened resin composition layer 3, and a laminated structure as shown in FIG. 3 was obtained (the peelable cover material 5 peeled off in use) /Acrylate-based adhesive/antistatic layer 6/thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) which can be peeled off together with the cover material 5/hardened resin composition contained therein in the state in which the glass fiber cloth 2 is impregnated Material layer 3 / thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) / antistatic layer 6 / acrylate adhesive which can be peeled off together with the cover material 5 / transparent sheet of the peelable cover material 5) peeled off during use material. In the obtained transparent sheet, the cured resin composition layer 3 (hardened product of the resin composition) is impregnated into the gap between the glass fibers of the glass fiber cloth, and the hardened resin composition layer 3 is formed on both surfaces of the glass fiber cloth layer. .

<Example 4> (Production of Glass Fiber Cloth 2) The warp yarn and the weft yarn were manufactured under the trade name "ECC1200 1/0 1.0Z" manufactured by UNITAKA GLASS FIBER Co., Ltd. (average filament diameter 4.5 μm, average filament number 100) , the number of turns 1.0Z), woven by a jet-type shuttleless loom, to obtain a plain woven glass fiber fabric having a warp density of 90 / 25 mm and a weft density of 90 / 25 mm. Next, the spinning sizing agent and the woven sizing agent adhering to the obtained glass fiber woven fabric were removed by heating at 400 ° C for 30 hours. Thereafter, the surface treatment agent decane coupling agent (S-350: N-vinylphenyl-aminoethyl-γ-aminopropyltrimethoxydecane (hydrochloride) Chisso Co., Ltd.) was adjusted to 15 g/ The concentration of L was squeezed by a dipper roll and dried at 120 ° C for 1 minute. Further, the glass fiber fabric was subjected to a water flow treatment at a pressure of 1.5 MPa, and the tension of the glass fiber woven fabric was subjected to a widening treatment in a direction of 100 N/m to obtain a glass fiber woven fabric. The obtained glass fiber woven fabric had a warp density of 90/25 mm, a weft density of 90/25 mm, a thickness of 27 μm, a mass of 30 g/m ² , and a refractive index of 1.561.

(The cover material which can be peeled off in the thermoplastic resin laminated layer) The polypropylene film which is the peelable cover material 5 peeled off at the time of use is laminated with the acrylate-based adhesive, and is dried on the one surface to be provided with antistatic. On the antistatic layer 6 of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4 of the layer 6, the adhesive is placed on the side of the antistatic layer 6, and the peelable cover material 5/acrylic acid 6 which is peeled off during use is obtained. The ester-based adhesive/antistatic layer 6/the laminated structure layer A of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4. Two sheets of the laminate A were prepared.

(Production of Transparent Sheet) The surface of the COSMOSHINE (registered trademark) A4300 of the laminate A obtained as described above (that is, the side opposite to the peelable cover material 5 peeled off from use) is applied as a cured resin composition. The cured resin composition described in Table 1 of Layer 3. Next, the glass fiber cloth 2 obtained above was placed on the cured resin composition as the cured resin composition layer 3, and allowed to stand for 1 minute to impregnate the gap between the glass fiber cloth 2 and the cured resin composition. Then, the laminated body A obtained as described above is applied to the surface of the COSMOSHINE (registered trademark) A4300 of the laminated body A (that is, the side opposite to the peelable covering material 5 peeled off from use). The three-layered method was placed, and the mass of the cured resin composition layer 3 was 90 g/m ^{2 by} pressurization from the layered body A. After that, the hardened resin composition as the cured resin composition layer 3 is irradiated with light using a black fluorescent lamp (trade name: FL15BLB, manufactured by Toshiba Co., Ltd.) in a state in which the peelable cover material 5 is peeled off during use. (Light irradiation condition: cumulative light amount: 200 mJ/cm ² ), the cured resin composition was cured to form a hardened resin composition layer 3, and a laminated structure as shown in FIG. 3 was obtained (the peelable cover material 5 peeled off in use) /Acrylate-based adhesive/antistatic layer 6/thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) which can be peeled off together with the cover material 5/hardened resin composition contained therein in the state in which the glass fiber cloth 2 is impregnated Material layer 3 / thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) / antistatic layer 6 / acrylate adhesive which can be peeled off together with the cover material 5 / transparent sheet of the peelable cover material 5) peeled off during use material. In the obtained transparent sheet, the cured resin composition layer 3 (hardened product of the resin composition) is impregnated into the gap between the glass fibers of the glass fiber cloth, and the hardened resin composition layer 3 is formed on both surfaces of the glass fiber cloth layer. .

<Comparative Example 1> (Production of Glass Fiber Cloth 2) The warp yarn and the weft yarn were sold under the trade name "ECBC3000 1/0 0.5Z" manufactured by UNITAKA GLASS FIBER Co., Ltd. (average filament diameter 4 μm, average filament number 50, The number of turns is 0.5Z), which is woven by a jet-type shuttleless loom to obtain a plain woven fiberglass fabric having a warp density of 95/25 mm and a weft density of 95/25 mm. Next, the spinning sizing agent and the woven sizing agent adhering to the obtained glass fiber woven fabric were removed by heating at 400 ° C for 30 hours. Thereafter, the surface treatment agent decane coupling agent (S-350: N-vinylphenyl-aminoethyl-γ-aminopropyltrimethoxydecane (hydrochloride) Chisso Co., Ltd.) was adjusted to 15 g/ The concentration of L was squeezed by a dipper roll and dried at 120 ° C for 1 minute. Further, the glass fiber fabric was subjected to a water flow treatment at a pressure of 1.5 MPa, and the tension of the glass fiber woven fabric was subjected to a widening treatment in the warp direction of 100 N/m twice to obtain a glass fiber woven fabric. The obtained glass fiber woven fabric had a warp density of 95 pieces/25 mm, a weft density of 95 pieces/25 mm, a thickness of 13 μm, a mass of 12 g/m ² , and a refractive index of 1.561.

(Production of Transparent Sheet) The cured resin composition described in Table 1 was applied to one sheet of the above vinyl chloride resin film. Next, the glass fiber cloth 2 obtained above was placed on the cured resin composition, and allowed to stand for 1 minute to impregnate the resin into the gap of the glass fiber cloth 2. Then, another sheet of the above-mentioned vinyl chloride resin film was placed thereon, and the weight of the cured resin composition layer 3 was 40 g/m ^{2 by} pressurization thereon. After that, the cured resin composition was irradiated with light (light irradiation conditions: cumulative light amount: 200 mJ/cm ² ) using a black fluorescent lamp (trade name: FL15BLB, manufactured by Toshiba Corporation) for each vinyl chloride resin film to form a cured resin composition. It is hardened to form a hardened resin composition layer, and a transparent sheet is obtained. In the obtained transparent sheet, the cured resin composition layer 3 (hardened product of the resin composition) is impregnated into the gap between the glass fibers of the glass fiber cloth 2, and the hardened resin composition is formed on both sides of the glass fiber cloth 2 layer. Layer 3.

<Comparative Example 2> (Production of Glass Fiber Cloth 2) The warp yarn and the weft yarn were manufactured under the trade name "ECBC3000 1/0 0.5Z" manufactured by UNITAKA GLASS FIBER Co., Ltd. (average filament diameter 4 μm, average filament number 50, The number of turns is 0.5Z), which is woven by a jet-type shuttleless loom to obtain a plain woven fiberglass fabric having a warp density of 95/25 mm and a weft density of 95/25 mm. Next, the spinning sizing agent and the woven sizing agent adhering to the obtained glass fiber woven fabric were removed by heating at 400 ° C for 30 hours. Thereafter, the surface treatment agent decane coupling agent (S-350: N-vinylphenyl-aminoethyl-γ-aminopropyltrimethoxydecane (hydrochloride) Chisso Co., Ltd.) was adjusted to 15 g/ The concentration of L was squeezed by a dipper roll and dried at 120 ° C for 1 minute. Further, the glass fiber fabric was subjected to a water flow treatment at a pressure of 1.5 MPa, and the tension of the glass fiber woven fabric was subjected to a widening treatment in the warp direction of 100 N/m twice to obtain a glass fiber woven fabric. The obtained glass fiber woven fabric had a warp density of 95 pieces/25 mm, a weft density of 95 pieces/25 mm, a thickness of 13 μm, a mass of 12 g/m ² , and a refractive index of 1.561.

(Production of Transparent Sheet) The cured resin composition described in Table 1 was applied onto the PET film having a thickness of 50 μm as the peelable cover material 5. Next, the glass fiber cloth 2 obtained above was placed on the resin composition, and allowed to stand for 1 minute to impregnate the resin into the gap of the glass fiber cloth 2. Then, another PET film having a thickness of 0.05 mm as the peelable cover material 5 was placed thereon, and the weight of the cured resin composition layer 3 was 40 g/m ^{2 by} pressurization thereon. After that, the resin composition was subjected to light irradiation (light irradiation condition: cumulative light amount: 200 mJ/cm ² ) using a black fluorescent lamp (trade name: FL15BLB, manufactured by Toshiba Corporation) for each of the PET films, and the cured resin composition was hardened. Forms the hardened resin composition layer 3. Next, two PET films having a thickness of 50 μm as the peelable cover material 5 were removed to obtain a transparent sheet. In the obtained transparent sheet, the hardened resin composition layer 3 (hardened product of the resin composition) is impregnated into the gap between the glass fibers of the glass fiber cloth 2, and a hardened resin is formed on both sides of the glass fiber cloth 2 layer. Layer 3.

<Comparative Example 3> (Production of Glass Fiber Cloth 2) The warp yarn and the weft yarn were manufactured under the trade name "ECD450 1/0 1.0Z" manufactured by UNITAKA GLASS FIBER Co., Ltd. (average filament diameter: 5 μm, average filament number: 200, The number of turns 1.0Z) was woven by a jet-type shuttleless loom to obtain a plain woven glass fabric having a warp density of 60/25 mm and a weft density of 60/25 mm. Next, the spinning sizing agent and the woven sizing agent adhering to the obtained glass fiber woven fabric were removed by heating at 400 ° C for 30 hours. Thereafter, the surface treatment agent decane coupling agent (S-350: N-vinylphenyl-aminoethyl-γ-aminopropyltrimethoxydecane (hydrochloride) Chisso Co., Ltd.) was adjusted to 15 g/ The concentration of L was squeezed by a dipper roll and dried at 120 ° C for 1 minute. Further, the glass fiber fabric was subjected to a water flow treatment at a pressure of 1.5 MPa, and the tension of the glass fiber woven fabric was subjected to a widening treatment in a direction of 100 N/m to obtain a glass fiber woven fabric. The obtained glass fiber woven fabric had a warp density of 60 pieces/25 mm, a weft density of 60 pieces/25 mm, a thickness of 50 μm, a mass of 53 g/m ² , and a refractive index of 1.561.

(The cover material 5 which can be peeled off in the thermoplastic resin laminated layer) The polypropylene film which is the peelable cover material 5 peeled off at the time of use is laminated with the acrylate-based adhesive, and is dried on the one surface. On the antistatic layer 6 of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4 of the electrostatic layer 6, the adhesive is placed on the side of the antistatic layer 6, and the peelable cover material 5/acrylic acid 6 which is peeled off during use is obtained. The acid-based adhesive/antistatic layer 6/the laminated structure layer A of COSMOSHINE (registered trademark) A4300 which is the thermoplastic resin layer 4. Two sheets of the laminate A were prepared.

(Production of Transparent Sheet) The surface of the COSMOSHINE (registered trademark) A4300 of the laminate A obtained as described above (that is, the side opposite to the peelable cover material 5 peeled off from use) is applied as a cured resin composition. The cured resin composition described in Table 1 of Layer 3. Next, the glass fiber cloth 2 obtained above was placed on the cured resin composition as the cured resin composition layer 3, and allowed to stand for 1 minute to impregnate the gap between the glass fiber cloth 2 and the cured resin composition. Then, the laminated body A obtained as described above is applied to the surface of the COSMOSHINE (registered trademark) A4300 of the laminated body A (that is, the side opposite to the peelable covering material 5 peeled off from use). The three-side method was placed, and the weight of the cured resin composition layer 3 was 160 g/m ^{2 by} pressurization from the layered body A. After that, the hardened resin composition as the cured resin composition layer 3 is irradiated with light using a black fluorescent lamp (trade name: FL15BLB, manufactured by Toshiba Co., Ltd.) in a state in which the peelable cover material 5 is peeled off during use. (Light irradiation condition: cumulative light amount: 200 mJ/cm ² ), the cured resin composition was cured to form a hardened resin composition layer 3, and a laminated structure as shown in FIG. 3 was obtained (the peelable cover material 5 peeled off in use) /Acrylate-based adhesive/antistatic layer 6/thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) which can be peeled off together with the cover material 5/hardened resin composition contained therein in the state in which the glass fiber cloth 2 is impregnated Material layer 3 / thermoplastic resin layer 4 (COSMOSHINE (registered trademark) A4300) / antistatic layer 6 / acrylate adhesive which can be peeled off together with the cover material 5 / transparent sheet of the peelable cover material 5) peeled off during use material. In the obtained transparent sheet, the cured resin composition layer 3 (hardened product of the resin composition) is impregnated into the gap between the glass fibers of the glass fiber cloth, and the hardened resin composition layer 3 is formed on both surfaces of the glass fiber cloth layer. .

Further, in the examples and comparative examples, the weaving density of the glass fiber woven fabric was measured and calculated by JIS R 3420 2013 7.9. Further, the thickness of the glass fiber woven fabric was measured and calculated by the JIS R 3420 2013 7.10.1A method. The quality of the glass fiber fabric was measured and calculated by JIS R 3420 2013 7.2. The refractive index of the cured resin composition and the glass fiber woven fabric was measured and calculated by the above method. The Abbe number of the cured resin composition and the glass fiber woven fabric was measured and calculated by the above method. The following evaluation was performed after the transparent sheet was produced and placed indoors for one week.

(Full light transmittance and haze before and after use in high temperature and high humidity environment) The full light transmittance and haze of transparent sheets before use in high temperature and high humidity environment are determined by JIS K7375 2008 Method for measuring light transmittance and total light reflectance. The total light transmittance and haze after use in a high-temperature and high-humidity environment are used as transparent sheets for promoting the test, and are placed in a constant temperature and humidity machine, and heated at a temperature of 50 ° C and a humidity of 90% for 7 days. The material was measured by JIS K7375 2008 "Method for obtaining plastic - total light transmittance and total light reflectance". In the high-temperature and high-humidity environment, the total light transmittance before and after use is 90% or more, and the haze before and after the high-temperature and high-humidity environment is 3% or less. Further, in Examples 1 to 4 and Comparative Example 3, the transparent sheet after peeling off the peelable covering material was evaluated.

(Initial tear strength (N)) Measured and calculated by the above method. Those above 50N are qualified. Further, in Examples 1 to 4 and Comparative Example 3, the transparent sheet after peeling off the peelable covering material was evaluated.

(Incombustibility evaluation) The radiant heat of 50 kw/m ² was irradiated on the surface of each transparent sheet with a radiant electric heater, and the total calorific value after 20 minutes from the start of heating was measured, and the amount of heat generation exceeded ²⁰⁰ kw/m ² after 20 minutes from the start of heating. The total calorific value after the start of heating for 20 minutes was 8 MJ/m ² or less, and the highest heat generation rate after continuous heating for 20 minutes and not more than ²⁰⁰ kW/m ² was evaluated as excellent inflammability (◎). Further, in Examples 1 to 4 and Comparative Example 3, the transparent sheet after peeling off the peelable covering material was evaluated.

(Evaluation of glass fiber cloth weaving enamel after burning of resin contained in transparent sheet) The transparent sheet was placed in a furnace at a temperature of 625 ° C for 60 minutes, taken out, and cooled to room temperature, and the glass cloth was visually observed. The status is evaluated using the following criteria. ○ The above is acceptable. Further, in Examples 1 to 4 and Comparative Example 3, the transparent sheet after peeling off the peelable covering material was evaluated. ◎: A through hole having a side of 0.5 mm or more was not formed in the texture, and the weaving flaw was not confirmed. ○: There is no through hole having a side of 0.5 mm or more in the texture, and although there is a slight weaving of the weir, it is practically not problematic. X: A through hole having a side of 0.5 mm or more was confirmed in the texture, and the weaving flaw was remarkable, which was a problem in practical use.

(Surface resistivity (Ω) of the transparent sheet) After the transparent sheet which has just been manufactured, it was left to stand under the environment of a temperature of 23 ° C and a relative humidity of 50% RH for 15 minutes by the aforementioned method, in accordance with JIS K 6911 1995 5.13.2. The resistivity and the measuring apparatus were measured using a high resistance meter 4339B manufactured by Agilent Technologies Co., Ltd. and a voltage of 100 V × 1 minute. Further, in Examples 1 to 4 and Comparative Example 3, the transparent sheet after the peelable cover material was peeled off was evaluated.

Table 1 shows the results of each evaluation.

[Table 1]

The transparent sheet of Examples 1 to 4 includes a glass fiber cloth having a thickness of 8 to 30 μm, a cured resin composition layer contained therein in a state in which the glass fiber cloth is impregnated, and a layer laminated on the hardened resin composition layer. Further, the thermoplastic resin layer selected from the group consisting of a polyester resin, a polycarbonate resin, and a polyamide resin is used, so that the initial tear strength can be improved, and the high-temperature and high-humidity environment can be improved and maintained. Transparency before and after use. Wherein, the glass fiber cloth woven fabric of the sheets of Examples 1 and 2 has an average filament diameter of 3.5 to 4.5 μm and a number of filaments of 20 to 55, and the woven density of the woven fabric is latitude and longitude. Both are 80 to 120/25 mm, the thickness is 9 to 13 μm, and the mass is 9 to 15 g/m ² , so that it is easier to prevent the woven crepe of the glass fiber cloth after the resin contained in the transparent sheet is burned. Further, in Examples 1, 3, and 4, since the resin composition containing the acrylic slurry was cured by the curable resin composition layer, the transparency before and after use in a high-temperature and high-humidity environment was further improved. In addition, in Example 1, the thickness of the glass fiber cloth was 13 μm or less, and the transparency before and after use in a high-temperature and high-humidity environment was remarkably excellent.

Further, in the case where the peelable cover material is peeled off, the transparent sheet of Examples 1 to 4 is excellent in alkali-resistant detergent property, can be subjected to high-frequency welding, and can further suppress generation of static electricity as the cover material is peeled off. Further, since the transparent sheets of Examples 1 to 4 contain a covering material, in particular, a light-transmitting covering material, it is possible to suppress the occurrence of damage in the manufacturing process of the transparent sheet and the installation of the smoke preventing wall. Excellent also. Further, the transparent sheets of Examples 1 to 4, particularly the transparent sheets of Examples 1 to 3, were also excellent in flexibility, and it was possible to form a roll-shaped product of 5 to 300 m.

On the other hand, the transparent sheet of Comparative Example 1 has a vinyl chloride resin film laminated on the cured resin composition, so that the plasticizer in the vinyl chloride resin is transferred (overflow) after use in a high-temperature and high-humidity environment, and oozes to chlorine. The interface between the vinyl resin film and the hardened resin composition layer failed to maintain transparency.

Since the transparent sheet of Comparative Example 2 does not contain a thermoplastic resin layer, the initial tear strength is poor, and the thermoplastic resin layer is laminated on the cured resin composition layer and is selected from the group consisting of polyester resins, polycarbonate resins, and polyfluorenes. One or more of the group consisting of amine resins.

In the transparent sheet of Comparative Example 3, since the thickness of the glass fiber cloth exceeded 30 μm, the transparency before and after use in a high-temperature and high-humidity environment was poor.

1‧‧‧Transparent sheet

2‧‧‧glass cloth

3‧‧‧ hardened resin composition layer

4‧‧‧ thermoplastic resin layer

5‧‧‧ peelable cover material

6‧‧‧Antistatic layer

31,32‧‧‧ Surface of the hardened resin composition layer

41, 42‧‧‧ Surface side portion of the thermoplastic resin layer 4

Fig. 1 is a schematic cross-sectional view showing an example of a transparent sheet of the present invention. Fig. 2 is a schematic cross-sectional view showing an example of a transparent sheet of the present invention. Fig. 3 is a schematic cross-sectional view showing an example of a transparent sheet of the present invention. Fig. 4 is a schematic plan view showing a method of measuring tear strength at the beginning of the present invention.

Claims (8)

A transparent sheet comprising: a glass fiber cloth having a thickness of 8 to 30 μm; a hardened resin composition layer contained therein in a state in which the glass fiber cloth is impregnated; and a layer of the hardened resin composition layer and comprising polyvinyl chloride A thermoplastic resin layer of a thermoplastic resin other than the resin. The transparent sheet according to claim 1, wherein the hardened resin composition layer is formed by hardening a resin composition containing an acrylic slurry. The transparent sheet according to claim 1 or 2, wherein the glass fiber cloth woven fabric has an average filament diameter of 3.5 to 4.5 μm and a filament number of 20 to 110, and the woven density of the woven fabric. Both the warp and weft are 80~120/25mm, the thickness is 9~30μm, and the mass is 9~35g/m ² . The transparent sheet of claim 1 or 2, wherein a total mass of the hardened resin composition layer and the thermoplastic resin layer in the transparent sheet is 150 to 300 g/m ² . The transparent sheet according to claim 1 or 2, wherein the peelable covering material is peeled off when the surface of the thermoplastic resin layer is laminated, and the thermoplastic resin layer contains an antistatic agent at least on the surface side. The transparent sheet of claim 1 or 2, which has a total light transmittance of 90% or more and a haze of 3% or less before and after the following test; (promotion test method): loading the transparent sheet into a constant temperature constant The wet machine was heated in a humid and hot environment at 50 ° C and a humidity of 90% for 7 days, and dried and naturally cooled. A smoke preventing vertical wall comprising the transparent sheet of claim 1 or 2. In a method of producing a transparent sheet, the transparent sheet comprises a glass fiber cloth, a photocurable resin composition layer contained therein in a state in which the glass fiber cloth is impregnated, and a layer laminated on the photocurable resin composition layer. a thermoplastic resin layer; the method for producing the transparent sheet comprising the following steps: Step A, preparing at least two light transmissive thermoplastic resin films laminated with a light-transmitting cover material; and Step B, obtained by the aforementioned Step A The two thermoplastic resin films are formed by sandwiching a glass fiber cloth impregnated with an unhardened photocurable resin composition so that the light transmissive covering material is located outside, and in this state, the uncured photohardenable resin composition The object is irradiated with light to harden the uncured photocurable resin composition.