glass plate

Abstract

To create a glass plate that offers excellent bendability and can effectively attenuate the collision energy of scattered fragments, even with low thickness and crystallinity. [Solution] The glass plate of the present invention is a glass plate for producing a glass-resin composite by compounding and integrating it with a resin plate, and is characterized in that the glass composition contains, in mole percent, SiO2 45-80%, Al2O 35-30%, Li2O+Na2O+K2O 0-20%, MgO 3-35%, CaO 0.1-35%, and SrO+BaO 0-15%.

Description

[Technical Field]

[0001] The present invention relates to a glass plate for creating a glass-resin composite by combining and integrating it with a resin plate, and more particularly to a glass plate for use in a glass-resin composite suitable for automobile windshields and door glass. [Background technology]

[0002] Generally, laminated glass is used for the windows of vehicles and the like, which is made by bonding and integrating multiple soda-lime glass plates with an organic resin intermediate layer. In some cases, glass-resin composites are used, which are made by bonding and integrating multiple soda-lime glass plates and a resin plate with an organic resin intermediate layer, in order to reduce weight (see Patent Documents 1 to 4).

[0003] Soda-lime glass sheets used in vehicle windows and the like have the function of reducing the impact energy of flying debris by deforming the shape of the tip of flying stones and other fragments while driving, thereby increasing their impact resistance.

[0004] However, soda-lime glass sheets are not sufficiently effective in increasing the impact resistance of flying fragments. Currently, impact resistance of flying fragments is increased by increasing the thickness of the soda-lime glass sheets or increasing the number of layers, but this leads to an increase in the thickness and mass of the window glass.

[0005] Therefore, in order to increase the impact resistance of the scattered fragments, the use of crystallized glass plates instead of soda-lime glass plates is being considered. For example, crystallized glass plates made by precipitating Li2O-Al2O3-SiO2 system crystals such as β-quartz solid solution (Li2O·Al2O3·nSiO2 [where n≧2]) as the main crystal are being investigated. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2012-144217 [Patent Document 2] Japanese Patent Publication No. 2004-196184 [Patent Document 3] Japanese Patent Publication No. 2001-151539 [Patent Document 4] Japanese Utility Model Publication No. 1-8821 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0007] Incidentally, increasing the crystallinity of crystallized glass increases its hardness and can reduce the impact energy of flying fragments. However, the precipitated crystals inhibit softening deformation, making bending difficult and rendering it unsuitable for applications such as automobile windshields. Furthermore, increasing the thickness of the crystallized glass can also reduce the impact energy of flying fragments, but in this case, the mass of the window glass increases, and there is a risk of compromising its transparency.

[0008] Therefore, the present invention has been made in view of the above circumstances, and its technical objective is to create a glass plate that is excellent in bendability and can effectively attenuate the collision energy of scattered fragments even if its thickness and degree of crystallinity are small. [Means for solving the problem]

[0009] The present inventors have found that the above technical problems can be solved by strictly regulating the glass composition range of the glass plate, and propose this as the present invention. Specifically, the glass plate of the present invention is a glass plate for producing a glass-resin composite by composite integration with a resin plate, and is characterized in that its glass composition contains, in mole percent, SiO2 45-80%, Al2O 35-30%, Li2O+Na2O+K2O 0-20%, MgO 3-35%, CaO 0.1-35%, and SrO+BaO 0-15%. Here, "Li2O+Na2O+K2O" refers to the combined amount of Li2O, Na2O, and K2O. "SrO+BaO" refers to the combined amount of SrO and BaO.

[0010] The glass plate of the present invention is a glass plate for creating a glass-resin composite by integrating it with a resin plate. In the glass-resin composite, the glass plate is a material that has transparency and enhances impact resistance. The resin plate is a material that mitigates the impact caused by the collision of flying fragments and prevents the scattering of glass fragments due to the impact of flying fragments. By incorporating both, it becomes easier to ensure impact resistance.

[0011] Figure 1 is a schematic diagram illustrating an example of a glass-resin composite. The glass-resin composite 10 has, from the outside in, a glass plate 11, a glass plate 12, and a resin plate 13. These have a three-dimensionally curved shape and are composited together by an organic resin intermediate layer (not shown). The glass plate 11 contains, in molar percentages, SiO2 45-80%, Al2O 35-30%, Li2O+Na2O+K2O 0-20%, MgO 3-35%, CaO 0.1-35%, and SrO+BaO 0-15%. The resin plate 13 is polycarbonate.

[0012] The inventors conducted a detailed analysis of the impact of flying fragments and found that the glass plate is first damaged by the shock wave caused by the impact of the flying fragments, and then the flying fragments penetrate the glass plate. They also found that dispersing the shock wave caused by the impact of the flying fragments reduces the impact energy of the flying fragments and prevents them from penetrating the glass plate. Further detailed analysis of the shock wave revealed that when the shock wave disperses and attenuates in the direction of propagation of the flying fragments and in the direction perpendicular to it, the speed of the shock wave increases in proportion to the Young's modulus of the glass plate. Therefore, since the glass plate of the present invention has the above glass composition, the Young's modulus can be increased. As a result, when subjected to an impact of flying fragments, the dispersion region of the shock wave widens, the energy absorption of the shock wave increases, and the speed of the flying fragments themselves can be effectively reduced. Consequently, it becomes more difficult for the flying fragments to penetrate the glass plate.

[0013] In addition, the glass plate of the present invention preferably has a Young's modulus of 80 GPa or more. By doing so, since the speed of the shock wave becomes faster in the glass plate, the dispersion region of the shock wave expands, and the collision energy of the scattered particles can be greatly attenuated. Here, the "Young's modulus" refers to the value measured by a well-known resonance method.

[0014] In addition, the glass plate of the present invention preferably has a liquid-phase viscosity of 10 2.0 d·Pa or more. By doing so, it becomes difficult for lumps and devitrification to occur, and continuous melting becomes possible. Here, the "liquid-phase viscosity" refers to the value measured by the platinum ball pulling-up method for the viscosity of the glass at the liquid-phase temperature. The "liquid-phase temperature" refers to the temperature at which crystals precipitate after putting glass powder that passes through a standard sieve of 30 mesh (500 μm) and remains on a 50 mesh (300 μm) into a platinum boat and holding it in a temperature gradient furnace for 24 hours.

[0015] In addition, the glass plate of the present invention preferably has a crystallinity of 30% or less. By doing so, the bending workability of the glass plate can be improved. Here, the "crystallinity" is obtained by calculating the area of the halo corresponding to the mass of the amorphous and the area of the peak corresponding to the mass of the crystal by measuring XRD by the powder method, and then using the formula [area of the peak] × 100 / [area of the peak + area of the halo] (%).

[0016] In addition, the glass plate of the present invention preferably has a plate thickness of 3 to 15 mm.

[0017] In addition, the glass plate of the present invention preferably has a three-dimensionally curved curved surface shape. By doing so, it becomes easier to apply to the windshield of an automobile or the like.

Brief Description of the Drawings

[0018] [Figure 1] It is a schematic diagram for explaining an example of a glass resin composite.

Embodiments for Carrying Out the Invention

[0019] The glass plate of the present invention contains, as a glass composition, in mol%, 45 to 80% of SiO2, 5 to 30% of Al2O3, 0 to 20% of Li2O + Na2O + K2O, 3 to 35% of MgO, 0.1 to 35% of CaO, and 0 to 15% of SrO + BaO. The reasons for regulating the content ranges of the respective components as described above are shown below. In the description of the content ranges of the respective components, the % notation refers to mol%.

[0020] SiO2 is a component that forms the glass network. The content of SiO2 is preferably 45 to 80%, 52 to 75%, particularly 58 to 72%. If the content of SiO2 is too low, it becomes difficult to vitrify and the weather resistance tends to decrease. On the other hand, if the content of SiO2 is too high, the melting property and formability tend to decrease, and the thermal expansion coefficient becomes too low, making it difficult to match the thermal expansion coefficients of the resin plate and the organic resin intermediate layer.

[0021] Al2O3 is a component that increases the Young's modulus and weather resistance. The content of Al2O3 is preferably 5 to 30%, 9 to 25%, 10 to 20%, particularly 12 to 18%. If the content of Al2O3 is too low, the Young's modulus and weather resistance tend to decrease. On the other hand, if the content of Al2O3 is too high, the melting property, formability, and devitrification resistance tend to decrease.

[0022] Li2O, Na2O, and K2O are components that lower the high-temperature viscosity and enhance the melting property, formability, and bending workability. The total content of Li2O, Na2O, and K2O is preferably 0 to 20%, 1 to 15%, particularly 2 to 10%. The content of Li2O is preferably 0 to 15%, 1 to 12%, particularly 2 to 10%. The content of each of Na2O and K2O is preferably 0 to 15%, 0 to 3%, particularly less than 0 to 1%. If the total content of Li2O, Na2O, and K2O is too high, the weather resistance tends to decrease. If the content of Li2O is too high, the devitrification resistance tends to decrease. If the content of Na2O and K2O is too high, the Young's modulus tends to decrease.

[0023] MgO is a component that significantly increases Young's modulus and also reduces high-temperature viscosity, thereby improving meltability, moldability, and bendability. The MgO content is preferably 3-35%, 8-30%, 12-25%, and particularly 14-20%. If the MgO content is too low, it becomes difficult to enjoy the above effects. On the other hand, if the MgO content is too high, the resistance to devitrification tends to decrease.

[0024] CaO is a component that increases Young's modulus and also lowers high-temperature viscosity, thereby improving meltability, moldability, and bendability. Furthermore, in compositional ranges with high MgO content, the introduction of CaO lowers the liquidus temperature and mitigates the decrease in devitrification resistance. The CaO content is preferably 0.1-35%, 1-25%, 2-20%, and particularly 4-15%. If the CaO content is too low, it becomes difficult to enjoy the above effects. On the other hand, if the CaO content is too high, the balance of the glass composition is disrupted, and devitrification resistance tends to decrease.

[0025] SrO and BaO are components that reduce high-temperature viscosity and improve meltability, moldability, and bendability. The combined amount of SrO and BaO is preferably 0-15%, 0-5%, and particularly less than 0-1%. The individual contents of SrO and BaO are preferably 0-12%, 0-5%, 0-2%, and particularly less than 0-1%. If the content of SrO and BaO is too high, the devitrification resistance and Young's modulus tend to decrease, and the density increases, which may lead to an excessive increase in the mass of the glass resin composite.

[0026] From the viewpoint of lowering the liquid phase temperature, the molar ratio MgO / (MgO+CaO+SrO+BaO) is preferably 0.95 or less, 0.9 or less, and particularly 0.85 or less. Note that "MgO / (MgO+CaO+SrO+BaO)" is the value obtained by dividing the MgO content by the total amount of MgO, CaO, SrO, and BaO.

[0027] From the viewpoint of increasing Young's modulus, the molar ratio CaO / (CaO+SrO+BaO) is preferably 0.5 or higher, 0.7 or higher, 0.8 or higher, and particularly 0.9 or higher. "CaO / (CaO+SrO+BaO)" refers to the value obtained by dividing the CaO content by the CaO, SrO, and BaO content.

[0028] In addition to the above ingredients, the following ingredients may also be added, for example.

[0029] B2O3 is a component that forms a network in the glass and reduces high-temperature viscosity, thereby improving meltability, moldability, and bendability. Therefore, the B2O3 content is preferably 0-15%, 0-10%, and particularly 0-5%. On the other hand, if the B2O3 content is too high, the Young's modulus and weather resistance tend to decrease.

[0030] P2O5 is a component that forms a network in the glass and enhances its meltability, formability, and bendability, and is particularly effective in increasing viscosity near the liquidus temperature. The P2O5 content is preferably 0-15%, 0-10%, and especially 0-5%. On the other hand, if the P2O5 content is too high, the Young's modulus and weather resistance tend to decrease, and phase separation is more likely to occur.

[0031] Y2O3 and La2O3 are components that significantly increase Young's modulus and also enhance meltability. The combined and individual content of Y2O3 and La2O3 is preferably 0-15%, 0-10%, and particularly 0-5%. On the other hand, if the content of Y2O3 and La2O3 is too high, the devitrification resistance tends to decrease, and the density increases, which may lead to an excessive increase in the mass of the glass resin composite.

[0032] TiO2 is an ingredient that enhances weather resistance, but it is also an ingredient that colors the glass. Therefore, the TiO2 content is preferably 0 to 0.5%, and particularly less than 0 to 0.1%.

[0033] ZrO2 is a component that enhances Young's modulus and weather resistance, but it is a component that reduces devitrification resistance. Therefore, the ZrO2 content is preferably 0 to 0.5%, and particularly less than 0 to 0.1%.

[0034] As a clarifying agent, one or more selected from the group consisting of SnO2, Cl, SO3, and CeO2 (preferably from the group consisting of SnO2 and SO3) may be added in an amount of 0.05 to 0.5%.

[0035] Fe2O3 is an unavoidable impurity in glass raw materials and is a coloring component. Therefore, the Fe2O3 content is preferably 0.5% or less, and particularly 0.01-0.07%.

[0036] V2O5, Cr2O3, CoO3, and NiO are coloring components. Therefore, the content of each of V2O5, Cr2O3, CoO3, and NiO is preferably 0.1% or less, and particularly less than 0.01%.

[0037] From an environmental perspective, it is preferable that the glass composition substantially does not contain As2O3, Sb2O3, PbO, Bi2O3, and F. Here, "substantially does not contain" means that the specified components are not actively added as glass components, but their presence as impurities is acceptable, and specifically refers to the content of the specified components being less than 0.05%.

[0038] The glass plate of the present invention preferably has the following characteristics.

[0039] The Young's modulus is preferably 80 GPa or higher, 85 GPa or higher, 90 GPa or higher, and particularly 95 to 150 GPa. If the Young's modulus is too low, the velocity of the shock wave caused by the collision of the flying fragments will be slow, causing the shock wave to spread only to a narrow region and making it difficult to attenuate the collision energy of the flying fragments.

[0040] The liquid phase viscosity is preferably 10 2.0 dPa·s or higher, 10 2.5 dPa·s or higher, 10 3.0 dPa·s or higher, 10 3.5 dPa·s or higher, especially 10 4.0It is above [value] dPa·s. By doing so, devitrification crystals are less likely to occur, making it easier to form by the float process or the roll-out process. As a result, the manufacturing cost of the glass sheet can be reduced and the quality of the glass sheet can be improved. The upper limit of the liquid-phase viscosity is not particularly limited, but considering the balance for satisfying various characteristics required for the glass sheet, it is advisable to design it to be 10 6.5 dPa·s or less.

[0041] The strain point is preferably 600 °C or higher, 650 °C or higher, 700 °C or higher, particularly 720 to 850 °C. If the strain point is too low, the heat resistance tends to decrease.

[0042] The softening point is preferably 1100 °C or lower, 1020 °C or lower, 980 °C or lower, particularly 950 °C or lower. If the softening point is too high, the bending processability tends to decrease.

[0043] The temperature of the glass at a high-temperature viscosity of 10 2.0 dPa·s is preferably 1600 °C or lower, 1580 °C or lower, 1560 °C or lower, particularly 1550 °C or lower. If the temperature of the glass at a high-temperature viscosity of 10 2.0 dPa·s is too high, the melting property and the formability tend to decrease.

[0044] The crystallinity is preferably 30% or lower, 10% or lower, 5% or lower, 1% or lower, particularly 0%, that is, amorphous. If the crystallinity is too high, the bending processability tends to decrease.

[0045] The thickness of the glass sheet is preferably 15 mm or less, 12 mm or less, 10 mm or less, particularly 8 mm or less, and is preferably 3 mm or more, 4 mm or more, 5 mm or more, 6 mm or more, particularly 7 mm or more. If the thickness of the glass sheet is too small, it becomes difficult to ensure the impact resistance performance. On the other hand, if the thickness of the glass sheet is too large, it becomes difficult to make the window glass thinner, and the visibility tends to decrease. Also, the mass of the window glass increases, and the fuel consumption of automobiles etc. rises.

[0046] The glass plate of the present invention is a glass plate for creating a glass-resin composite by combining and integrating it with a resin plate. In a glass-resin composite, it is preferable that there are multiple glass plates. When a glass-resin composite has multiple glass plates, it may include glass plates other than the glass plate of the present invention (for example, soda-lime glass plates), but from the viewpoint of accurately enjoying the effects of the present invention, it is preferable that all the glass plates are the glass plate of the present invention.

[0047] In a glass-resin composite, there may be multiple resin plates, but from the viewpoint of improving visibility, it is preferable to have only one plate. Various resins such as acrylic and polycarbonate can be used for the resin plate, but polycarbonate is particularly preferred from the viewpoint of transparency, impact absorption, and weight reduction.

[0048] The thickness of the resin sheet is preferably 10 mm or less, 8 mm or less, 7 mm or less, 6 mm or less, and particularly 5 mm or less, and preferably 0.5 mm or more, 0.7 mm or more, 1 mm or more, 2 mm or more, and particularly 3 mm or more. If the thickness of the resin sheet is too small, it will be difficult to mitigate the impact when flying fragments collide with it. On the other hand, if the thickness of the resin sheet is too large, it will be difficult to make the window glass thinner, and the visibility of the window glass will easily decrease.

[0049] In glass-resin composites, it is preferable that glass plates are composited and integrated with each other, or with the resin plate, by an organic resin intermediate layer. The thickness of the organic resin intermediate layer is preferably 0.1 to 2 mm, 0.3 to 1.5 mm, 0.5 to 1.2 mm, and particularly 0.6 to 0.9 mm. If the thickness of the organic resin intermediate layer is too small, the energy of the shock wave will easily propagate into the room when a fragment collides. On the other hand, if the thickness of the organic resin intermediate layer is too large, the visibility of the window glass will easily decrease.

[0050] The thermal expansion coefficient of the organic resin intermediate layer is preferably greater than or equal to the thermal expansion coefficient of the glass plate and less than or equal to the thermal expansion coefficient of the resin plate. This makes it less likely for the glass plate and resin plate to separate and deform when the window glass is heated by direct sunlight. Note that "thermal expansion coefficient" refers to the average linear thermal expansion coefficient in the temperature range of 0 to 300°C.

[0051] Various organic resins can be used as the organic resin intermediate layer, for example, polyethylene (PE), ethylene vinyl acetate copolymer (EVA), polypropylene (PP), polystyrene (PS), methacrylic resin (PMA), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), cellulose acetate (CA), diallyl phthalate resin (DAP), urea resin (UP), melamine resin (MF), unsaturated polyester (UP), polyvinyl butyral (PVB), polyvinyl Materials such as vinyl formal (PVF), polyvinyl alcohol (PVAL), vinyl acetate resin (PVAc), ionomer (IO), polymethylpentene (TPX), vinylidene chloride (PVDC), polysulfone (PSF), polyvinylidene fluoride (PVDF), methacrylic styrene copolymer resin (MS), polyalate (PAR), polyallyl sulfone (PASF), polybutadiene (BR), polyethersulfone (PESF), or polyetheretherketone (PEEK), polyurethane (PU), etc., can be used. Among these, EVA, PVB, and PU are preferred from the viewpoint of transparency and adhesion, and PVB is particularly preferred because it can provide sound insulation.

[0052] A coloring agent may be added to the intermediate layer of the organic resin, and an absorber that absorbs specific wavelengths of light such as infrared and ultraviolet rays may also be added.

[0053] The organic resin intermediate layer may be a combination of multiple types of the above-mentioned organic resins. For example, if two organic resin intermediate layers are used to integrate a glass plate and a resin plate, the glass plate and the resin plate are fixed with different organic resins, which makes it easier to reduce the warping of the window glass.

[0054] The total thickness of the glass-resin composite is preferably 65 mm or less, 60 mm or less, or 55 mm or less, and preferably 4 mm or more, 5 mm or more, 7 mm or more, and particularly 10 mm or more. If the total thickness of the glass-resin composite is too small, the impact resistance of the window glass tends to decrease. On the other hand, if the total thickness of the glass-resin composite is too large, the mass of the window glass becomes heavy, and the visibility of the window glass tends to decrease.

[0055] Glass plates can be made in the following way.

[0056] First, glass raw materials, prepared to achieve a predetermined glass composition, are placed in a continuous melting furnace, heated and melted at 1500-1700°C, clarified, and stirred. Afterward, they are supplied to a molding device to be formed into a plate shape, and then slowly cooled to produce a glass plate.

[0057] It is preferable to use the float method as a method for forming glass plates. The float method is a method that can produce glass plates at low cost.

[0058] In addition to the float method, the roll-out method and the overflow downdraw method may also be used. The overflow downdraw method is a method that allows for the mass production of thin glass plates with an unpolished surface. Furthermore, keeping the surface unpolished can reduce the manufacturing cost of the glass plates.

[0059] It is preferable that the glass plate be chamfered as needed. In that case, it is preferable to perform C-chamfering using an #800 metal bond grinding wheel or the like. This can increase the strength of the edge. It is also preferable to etch the edge of the glass plate as needed to reduce the crack source present on the edge.

[0060] Next, the obtained glass plates are subjected to curved surface processing as needed. Various methods can be employed for curved surface processing. In particular, a method of press-forming glass plates one by one or in stacks using a mold is preferred, and it is preferable to pass the glass plates through a heat treatment furnace while sandwiched between molds of a predetermined shape. This improves the dimensional accuracy of the curved surface. Alternatively, a method is also preferred in which glass plates are placed one by one or in stacks on a mold of a predetermined shape, and then a part or the entire glass plate is heat-treated to soften and deform the glass plate by its own weight, conforming to the shape of the mold. This improves the efficiency of curved surface processing.

[0061] Next, a glass-resin composite can be produced by integrating glass plates (preferably multiple glass plates) and resin plates with an organic resin intermediate layer. Methods for integrating the composite include injecting organic resin between glass plates or between glass plates and resin plates and then curing the organic resin, or placing an organic resin sheet between glass plates or between glass plates and resin plates and then subjecting it to pressurized heat treatment (thermocompression bonding). The former method can suppress deformation of the resin plate due to expansion mismatch between the glass plate and the resin plate. The latter method is easier to integrate.

[0062] Furthermore, after the composite integration, a functional film such as a hard coat film or an infrared reflective film may be formed on the outer surface of the outermost glass plate. Alternatively, a functional film may be formed on the inner surface of the outermost glass plate before the composite integration. [Examples]

[0063] The present invention will be described in detail below based on the following examples. Note that the following examples are merely illustrative. The present invention is not limited in any way to the following examples.

[0064] Table 1 shows examples of the present invention (samples No. 1 to 12) and comparative examples (samples No. 13 to 16).

[0065] [Table 1]

[0066] Glass plates were prepared as follows. The glass raw materials were mixed to obtain the glass plates shown in Table 1. Next, the mixed glass batch was placed in a continuous melting furnace and melted at 1600°C for 20 hours. After clarification and stirring, homogeneous molten glass was obtained and then formed into a plate with a thickness of 8.0 mm. For the obtained glass plates, density, Young's modulus, liquidus temperature, liquidus viscosity, strain point, softening point, and high-temperature viscosity were measured. 2.0 The temperature and crystallinity of the glass at dPa·s were evaluated. The glass plates for samples No. 1 to 12 contained 0.05 mol% Fe2O3 impurities, and less than 0.01 mol% each of V2O5, Cr2O3, CoO3, and NiO impurities.

[0067] The density was measured using the well-known Archimedes method.

[0068] Young's modulus is a value measured using the well-known resonance method.

[0069] Each sample was pulverized, passed through a 30-mesh (500 μm) standard sieve, and the glass powder remaining in the 50-mesh (300 μm) sieve was placed in a platinum boat and held in a temperature gradient furnace for 24 hours. After removing the platinum boat, the temperature at which devitrification (crystalline foreign matter) was observed in the glass was defined as the liquidus temperature. Furthermore, the viscosity at the liquidus temperature was measured using the platinum ball pulling method and defined as the liquidus viscosity.

[0070] The strain point and softening point were measured according to the ASTM C336 method.

[0071] High temperature viscosity 10 2.0 The temperature of glass in dPa·s was measured using the platinum sphere pulling method. This is the value obtained.

[0072] Crystallinity is calculated by measuring XRD using the powder method, determining the area of ​​the halo corresponding to the mass of amorphous material and the area of ​​the peak corresponding to the mass of crystals, and then using the formula [peak area] × 100 / [peak area + halo area] (%).

[0073] As can be seen from Table 1, samples No. 1 to 12 have high Young's modulus, resulting in high impact resistance, and their low crystallinity makes them easy to bend. Furthermore, their high liquid-phase viscosity suggests that continuous melting is possible. Therefore, samples No. 1 to 12 are considered suitable as glass plates for creating glass-resin composites by integrating them with resin plates. On the other hand, samples No. 13 to 15 have low Young's modulus, resulting in low impact resistance. Sample No. 16 has low liquid-phase viscosity, making continuous melting difficult.

[0074] Next, the glass plate corresponding to sample No. 1 was placed in a mold of a predetermined shape and passed through a heat treatment furnace, thereby curving it into a curved surface shape in which the entire width direction and the entire length direction were curved in an arc. After that, the end faces of the curved glass plate were chamfered and polished using an #800 metal bond grinding wheel.

[0075] Next, we prepared a polycarbonate sheet (4.0 mm thick) with a curved shape similar to that of a glass sheet.

[0076] Finally, using 0.8 mm thick polyvinyl butyral (PVB), the glass plate corresponding to sample No. 1 (outer layer glass plate), the glass plate corresponding to sample No. 1 (inner layer glass plate), and the polycarbonate plate were combined and integrated by autoclaving in that order from the outside (atmospheric side) to obtain the glass-resin composite corresponding to sample No. 1. Furthermore, similar experiments were performed on samples No. 2 to 12 to obtain the glass-resin composite corresponding to samples No. 2 to 12. [Industrial applicability]

[0077] The glass plate of the present invention is suitable as a glass plate for creating a glass-resin composite by combining it with a resin plate. This glass-resin composite is suitable for window glass in automobiles, railways, aircraft, etc., and is also suitable for window glass in buildings such as high-rise buildings. [Explanation of symbols]

[0078] 10 Glass resin composite 11 Glass plate 12 glass plates 13 Resin plate

Claims

1. A glass plate for creating a glass-resin composite by combining and integrating with a resin plate, wherein the glass composition is SiO2 in mol%. ２ 45-80%, Al ２ O ３ 5-30%, MgO 8-35%, CaO 0.1-35%, Na ２ A glass plate characterized by containing less than 0-1% of O and having a three-dimensionally curved surface shape.

2. The glass plate according to claim 1, characterized in that its Young's modulus is 80 GPa or more.

3. Liquid phase viscosity is 10 ２．０ The glass plate according to claim 1 or 2, characterized in that it is d·Pa or greater.

4. A glass plate according to any one of claims 1 to 3, characterized in that its degree of crystallinity is 30% or less.

5. A glass plate according to any one of claims 1 to 4, characterized in that the plate thickness is 3 to 15 mm.

6. As a glass composition, in mol%, SiO ２ 45 to 80%, Al ２ O ３ 5 to 30%, MgO 8 to 35%, CaO 0.1 to 35%, Na ２ O less than 0 to 1% is contained, and a glass resin composite characterized in that a glass plate having a three-dimensionally curved surface shape and a resin plate are integrally combined.

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