WO2008007676A1 - substrat de verre sans alcalin, son processus de fabrication et panneaux d'affichage à cristaux liquides - Google Patents
substrat de verre sans alcalin, son processus de fabrication et panneaux d'affichage à cristaux liquides Download PDFInfo
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- WO2008007676A1 WO2008007676A1 PCT/JP2007/063758 JP2007063758W WO2008007676A1 WO 2008007676 A1 WO2008007676 A1 WO 2008007676A1 JP 2007063758 W JP2007063758 W JP 2007063758W WO 2008007676 A1 WO2008007676 A1 WO 2008007676A1
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- Prior art keywords
- glass
- mgo
- glass substrate
- alkali
- cao
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133302—Rigid substrates, e.g. inorganic substrates
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/09—Materials and properties inorganic glass
Definitions
- the present invention relates to an alkali-free glass substrate, a method for producing the same, and a liquid crystal display panel.
- buffered hydrofluoric acid hydrofluoric acid + ammonium fluoride; BHF
- BHF hydrogen fluoric acid + ammonium fluoride
- ITO indium oxide doped with tin
- Durable against various acids nitric acid, sulfuric acid, etc.
- alkaline resist stripping solutions used for etching metal electrodes.
- Thinning of the glass substrate is desired as a method for reducing the weight of the display!
- the linear expansion coefficient is required to be the same as that of conventional alkali-free glass so that conventional processes and equipment can be used in the manufacturing process of liquid crystal displays.
- LCD TVs have become widespread and powerful, and in the manufacturing process of liquid crystal displays! / Glass substrates have been used so far so that multiple liquid crystal display panels can be removed from large glass plates.
- the strain point is 640 ° C. or higher, and substantially in terms of mol%, SiO: 60 to 73%, A10: 5 to 16%, BO: 5 to 12%, MgO : 0-6%, CaO: 0-9%, SrO:
- Such alkali-free glass can be molded by the float process, has excellent acid resistance, is less susceptible to white turbidity due to buffered hydrofluoric acid (BHF), has high heat resistance, has a low coefficient of linear expansion, has a low density Is listed as very small! /, And! /
- BHF buffered hydrofluoric acid
- Patent Document 2 describes that, in terms of mol%, substantially, SiO: 60% or more and less than 66%, Al 2 O 3
- B 2 O 5-10%, MgO: 0 ⁇ ; 18%, CaO: 0 ⁇ ; 18%, SrO: 0 ⁇ ; 18%, B
- AO 0 to 6%
- CaO + SrO 10 to 25%
- MgO + CaO + SrO + BaO 15.5-30%
- an alkali-free glass substantially free of alkali metal oxide is described.
- Such alkali-free glass is suitable for forming by the float method because of its excellent reduction resistance, and the glass surface is reduced when formed by the float method, such as deterioration of devitrification characteristics. It is described that various problems due to the action are solved, the strain point is small when the density is small, the Young's modulus is small when the linear expansion coefficient is small.
- Patent Document 1 JP-A-9 169539
- Patent Document 2 JP-A-2005-330176
- the alkali-free glass substrate used as the glass substrate is required to have various characteristics.
- the glass substrate is required to have a characteristic for forming a low-viscosity glass melt in addition to the above-mentioned characteristics!
- the This is because if the viscosity of the glass melt is high, it is difficult to make the glass composition uniform, and it becomes difficult to improve the flatness of the glass substrate in the float forming process of a large glass substrate. Moreover, it is difficult to obtain a glass with less bubbles.
- the temperature of the molten glass is raised to lower the viscosity, the temperature of the glass ribbon flowing into the float forming process increases, and inconveniences are likely to occur in terms of equipment and production in the float forming process.
- the present invention is a glass having a relatively low melting temperature at the time of glass melting and molding in order to obtain a glass substrate having such characteristics, that is, homogeneity and flatness and having few bubbles.
- Another object of the present invention is to provide an alkali-free glass substrate that has excellent acid resistance and is not devitrified by float molding with low deflection, low linear expansion coefficient, high strain point, low density. .
- the present invention has a Young's modulus of 75 GPa or more, preferably 79 GPa or more, and a linear expansion coefficient (50 to 350 ° C.) of 30 ⁇ 10 ⁇ so that the deflection of the glass substrate is small even for a large glass.
- ⁇ 260 ° C (crawl 1260 ° C), preferably 1250 ° C or less ( ⁇ 1250 ° C), more preferably 1245 ° C or lower (T ⁇ 1245 ° C), devitrification temperature T or lower, 90 ° C used as an index of acid resistance
- Another object of the present invention is to provide a liquid crystal display panel using such an alkali-free glass substrate. It is another object of the present invention to provide a method for producing such an alkali-free glass substrate.
- the present inventor has conducted intensive research and found that an alkali-free glass substrate having each of the above-described physical properties, in which each component is within a specific range and having a specific relationship, is particularly a glass for liquid crystal display.
- the present invention has been completed by finding that it is optimal as a substrate.
- the present invention is the following ⁇ to (h).
- Weight loss per unit area after immersion for 20 hours in HCl at 90 ° C, 0.IN is less than 0.6 mg / cm f
- a non-alkali glass substrate A non-alkali glass substrate.
- MgO 5.0 ⁇ ; 10.0%, CaO: 5.0 to 10.0%
- a method for producing an alkali-free glass substrate wherein the melting temperature of the glass raw material is less than 1630 ° C, and the maximum temperature of the glass melt at the float bath inlet is 1250 ° C.
- the Young's modulus is high (75 GPa or more, preferably at least 79GPa), the linear expansion coefficient (50 to 350 ° C) is low (30 X 10- 7 ⁇ 40 X 10- Seo. C)
- Non-devitrifying by float forming (devitrification temperature ⁇ T), excellent acid resistance (90 ° C, 0.IN HC1
- Such an alkali-free glass substrate of the present invention has a more uniform glass composition with less deflection and higher flatness.
- the viscosity is low, it is possible to obtain a non-alkali glass substrate that floats quickly when the glass melts and has few bubbles.
- a liquid crystal display panel having a higher definition and a higher contrast ratio using such an alkali-free glass substrate can be provided.
- the melting temperature is less than 1630 ° C, preferably up to 1620 ° C
- the glass melt temperature at the float bath inlet in the float process is less than 1260 ° C, preferably up to 1250 ° C, more preferably up to It is possible to provide a method for producing an alkali-free glass substrate that can be produced at 1245 ° C with energy savings.
- the alkali-free glass substrate of the present invention (hereinafter also referred to as “the glass substrate of the present invention”) is substantially composed of SiO, Al 2 O, B 2 O, MgO, CaO, and SrO. And other ingredients, especially
- Alkaline components meaning alkali metal elements (Li, Na, K, Rb, Cs and Fr) and compounds containing one or more of these elements) and BaO are substantially not contained! /.
- substantially does not contain means that it is not contained other than impurities inevitably mixed in from the raw material.
- a part of clarifier used in the process of manufacturing the glass substrate of the present invention, a reaction product thereof, and the like may be included.
- the content (%) of each component contained in the glass substrate of the present invention is expressed in mol% based on the following oxides.
- “%” indicating the content rate means “mol%”.
- SiO is 57 ⁇ 0-6.60%, preferably 57.0–65.%, More preferably (59.0-65.0%, more preferably ( or 60. 0-65. 0 0/0 containing.
- a high SiO content is preferable because the density of the glass substrate of the present invention is low. However, if it is too high, the devitrification property may deteriorate. On the other hand, if the content is too low, the acid resistance may decrease, the density may increase, the strain point may decrease, the linear expansion coefficient may increase, and the Young's modulus may decrease.
- AlO is 6.0-15.0%, preferably 7.0-14.0%, more preferably (or 8.0-13.0%, more preferably ( 9. 0-12. 0%, more preferably (10.0-; 12. 0%, particularly preferably 10. 5-11. 5%.
- the glass substrate of the present invention has a glass substrate content of 3 ⁇ 0-12. 0%, preferably 4.0–11.0%, more preferably (or 5.0–10.0%, further This is preferably (containing 6.0 to 9.0%, particularly preferably (containing 6.5 to 8.5%).
- soot it is preferable to contain soot at such a content because it can reduce the density, improve the BHF resistance, improve the melting reactivity of the glass, and improve the devitrification properties. If this content is too high, the Young's modulus may be lowered and the acid resistance may be lowered.
- the total amount of SiO, Al 2 O and BO is preferably 80% or more, more Preferably 80.
- the glass substrate of the present invention contains MgO 3 ⁇ 0-12. 0%, preferably 4.0-11.0%. More preferably (5.10-10. 0 ⁇ / ⁇ , more preferably (5. 5-10. 0%, particularly preferably (6.5 to 8.5%).
- MgO is contained at such a content, the density is lowered, the dissolution reactivity is improved, the linear expansion coefficient is not increased, and the strain point is not lowered, which is preferable. If this content is too high, the glass may undergo phase separation, and the devitrification characteristics and acid resistance may deteriorate.
- the glass substrate of the present invention contains CaO in an amount of 3.0 to 12.0%, preferably 4.0 to 11.0%, more preferably (or 5.0 to 10.0%, more Preferably (5.5 to 10.0%, particularly preferably (containing 6.0 to 8.0%).
- the density is lowered, the linear expansion coefficient is not increased, the strain point is not lowered, the dissolution reactivity is improved, the viscosity is lowered, the devitrification property is improved, and the acid resistance is improved. This is preferable because it improves the properties and suppresses the phase separation. If this content is too high, the linear expansion coefficient and density may increase.
- the glass substrate of the present invention has SrO of 1 ⁇ 5 to 8 ⁇ 0%, preferably 2.0 to 7.0%, more preferably (2.5 to 6.0%, more This content is preferably (2.5 to 5.5%, particularly preferably 2.5 to 4.0%.
- the density is not increased, the linear expansion coefficient is not increased, the strain point is not lowered, the viscosity is lowered, the phase separation tendency is suppressed, and the dissolution reactivity is not lowered. It is preferable because it improves devitrification properties and acid resistance. If this content is too high, the devitrification characteristics may decrease, the linear expansion coefficient may increase, the density may increase, and the acid resistance may decrease.
- the glass substrate of the present invention has a total content of MgO, CaO and SrO (mol%), that is, MgO + CaO + SrO is 15.0 to 20.0%, and 15.5 —19. 5% force ⁇ preferably, 16.0-19.0% more preferred, 16.5-19.0% more preferred.
- the viscosity becomes lower as the temperature of the glass melt is higher.
- the temperature T of the glass melt is less than 1630 ° C, preferably less than 1620 ° C.
- the viscosity (7) can be 10 2 dPa's (viscosity for dissolution).
- the rising speed of bubbles in the molten glass is increased, and it is possible to reduce the number of bubbles in the resulting alkali-free glass. Therefore, in the glass substrate of the present invention, the glass melt can be more easily homogenized.
- the glass melt temperature T is less than 1260 ° C, preferably 1250 ° C or more.
- the viscosity (7) can be made 10 4 dPa 's (viscosity of moldability) even when the temperature is 1245 ° C or lower, more preferably 1235 ° C or lower. Therefore, it is possible to easily improve the flatness of the glass substrate in a float forming process or the like.
- the total amount of MgO + CaO + SrO is particularly preferably 16.0 to 18.5%.
- the Young's modulus of the above range (more than 75 GPa), linear expansion coefficient (30 X 10- 7 ⁇ 40 X 10- Seo. C), strain point (640 ° or C), It was not a glass having a density (2 ⁇ 60 g / cm 3 or less) and also having the characteristics of forming a low-viscosity glass melt as described above.
- the temperature of the glass melt is described in, for example, Patent Document 1.
- the glass substrate of the present invention can reduce the melting temperature and the glass ribbon temperature during float forming in the production process, so that the energy used for heating and the like is reduced. This is advantageous in terms of cost. T 1245 ° C
- the temperature is 4 or less, preferably 1235 ° C or less, float molding is further facilitated, and a flat glass substrate with few defects of dross top spec is obtained. Can be reduced.
- the devitrification temperature is T or less.
- the glass substrate of the present invention has a MgO / (MgO + CaO + SrO) ratio of the MgO content (mol%) to the total MgO, CaO and SrO content (mol%).
- each component is in the range described above, further this ratio A is in such a range, the linear expansion coefficient of 50 ⁇ 350 ° C 30 X 10- 7 ⁇ 40 X 10- 7 / ° C Can be obtained. Therefore, when a liquid crystal display or the like is produced using the glass substrate of the present invention, a display with less pattern deviation can be produced efficiently without changing conventional processes and equipment.
- the ratio of BO content (mol%) to the total content of SiO, Al 2 O and BO (mol%), ie, BO / (SiO + A1 O + BO) is 0 ⁇ 12 or less. It is preferably 0.11 or less, more preferably 0.10 or less, and more preferably 0.095 or more (this ratio is also referred to as “ratio ⁇ ” below). ).
- the glass substrate of the present invention is an alkali-free glass substrate having the above composition.
- the preferred composition is summarized as follows.
- the content of each component is expressed in mol% on oxide basis.
- MgO 5.0 to; 10.0% CaO: 5.0 to 10.0%
- the content of each component is expressed in mol% on oxide basis.
- the glass substrate of the present invention has a Young's modulus of 75 GPa or more and a force of 76 GPa or more. Preferably it is 77 GPa or more, more preferably 79 GPa or more, and even more preferably 80 GPa or more.
- the glass substrate of the present invention is 50 to 350 linear expansion coefficient ° C is 30 X 10- 7 ⁇ 40 X 10- 7 / ° C Power 32 X 10- 7 ⁇ 40 X 10- 7o C Ca preferably, more preferably 35 X 10- 7 ⁇ 39 X 10- 7 ° C.
- the glass substrate of the present invention preferably has a strain point of 640 ° C or higher, a force of 650 ° C or higher, and more preferably 655 ° C or higher.
- the glass substrate of the present invention is that the force S preferably a density of force 2. 55 g / cm 3 hereinafter is 2 ⁇ 60g / cm 3 or less, 2. and more preferably 52 g / cm 3 or less.
- a force of less than 4 is preferably 1250 ° C or less, more preferably 1245 ° C or less, even more preferably 1240 ° C or less, and particularly preferably 1235 ° C or less
- the glass substrate of the present invention has a mass loss per unit area of not more than 0.6 mg / cm 2 after being immersed in HC1 at 90 ° C., IN, which is an index showing acid resistance, for 20 hours.
- IN an index showing acid resistance
- 0. 3 mg / cm 2 or less it is it is not particularly preferred is more preferred instrument 0. 2 mg / cm 2 or less.
- T is
- Each means a value obtained by measurement by the following method.
- the Young's modulus means a value obtained according to the bending resonance method (JIS R1602).
- a linear expansion coefficient of 50 to 350 ° C means a value measured using a differential thermal dilatometer (TMA).
- the strain point means a value measured according to JIS R3103.
- the density means a value obtained using a simple densimeter based on the Archimedes method.
- the devitrification temperature is the average of heating the glass piece for 17 hours, finding the maximum temperature at which crystals precipitate and the minimum temperature at which crystals do not precipitate.
- the amount of mass reduction (mg / cm 2 ) per unit area after 20 hours immersion in 0.1N HC1 at 90 ° C is used.
- the glass substrate of the present invention can be produced, for example, by the following method.
- raw materials usually used are prepared so as to have the composition (target composition) of the glass substrate of the present invention.
- a clarifier may be included.
- the fining agent for example F, Cl, SO, SnO, T iO, Mn_ ⁇ 2, CeO ZrO Fe 2 ⁇ 3 or Nb O and the like. It is preferable to contain a fining agent because the defoaming effect can further reduce bubbles in the glass substrate of the present invention after molding. These may be added alone or in combination of two or more.
- SnO is more preferable.
- SO is more preferable.
- Fe 2 O, Cl, and F are more preferable. This is because the defoaming-clarifying effect in the production process of the alkali-free glass of the present invention can be promoted and strengthened. These produce a large amount of bubbles when the raw material is heated, and the bubbles in the molten glass are enlarged to assist defoaming.
- the total content is preferably 5% by mass or less.
- F + C1 + SO + SnO + TiO + MnO + CeO + ZrO + FeO is preferred to be 10 ppm to 5 mass%.
- the glass substrate after molding contains SnO force ⁇ OOppm to 1.0 mass%.
- Sn_ ⁇ 2 when dissolved by heating the glass raw material is reduced to SnO by generating oxygen as shown in the following reaction scheme (A), generated Oxygen floats on the surface of the molten glass together with bubbles contained in the molten glass.
- such a raw material is continuously charged into the melting furnace, and is less than 1630 ° C, preferably up to 1 620 ° C, more preferably up to 1500 ° C; 1610 ° C (maximum temperature is 1500 In the range of 16 ° C), more preferably up to 1600 ° C, particularly preferably up to 1500 ° C; up to 1600 ° C (maximum temperature 1500 ° C to 1600 ° C)
- a glass melt is obtained. Since the glass substrate of the present invention has a low viscosity as described above, even if it is melted at a temperature of less than 1630 ° C., preferably 1620 ° C. or less, it is as much as when a conventional alkali-free glass substrate is melted. Use the force S to homogenize the glass.
- the glass raw material is heated to 1450 to 1580 ° C to obtain molten glass, and after the melting step 1, the molten glass is changed to 1500 A melting step 2 for defoaming bubbles in the glass by heating to ° C or higher and lower than 1630 ° C, and the temperature of the molten glass in the melting step 2 is higher than the temperature of the molten glass in the melting step 1 30 It is preferable to use a method of raising the temperature by at least ° C to obtain a glass melt.
- an industrial glass raw material containing SnO is prepared so as to be the alkali-free glass of the present invention.
- the prepared raw material is continuously charged into a melting furnace or the like, heated and melted to obtain molten glass (melting step).
- the melting step includes a melting step 1 in which a raw material is charged into a melting furnace or the like and heated to convert the raw material into molten glass, and then a melting step 2 in which the molten glass is further heated to defoam bubbles in the glass. Is preferred. This is because an oxygen-free glass with fewer bubbles can be obtained by generating oxygen all at once from the reduction reaction of SnO.
- the temperature at which the raw material becomes molten glass in the melting step 1 (hereinafter referred to as "initial temperature”) Also called.
- the temperature of the molten glass in melting step 2 (hereinafter also referred to as “attainable temperature”) is preferably 30 ° C or higher, more preferably 50 ° C or higher, and 70 ° C. More high! /, More preferable, more than 90 ° C higher! /, Even more preferable! /.
- the initial temperature in the dissolving step 1 is 1450 to 1580 ° C although the raw material is dissolved, and is preferably 1580 ° C.
- the temperature is more preferably 1490 ° C or higher, and further preferably 1530 ° C or higher.
- the temperature is more preferably 1570 ° C or lower, and further preferably 1560 ° C or lower.
- the temperature reached in the melting step 2 is preferably 1500 ° C or higher and lower than 1630 ° C.
- the ultimate temperature is more preferably 1540 or more, and further preferably 1580 ° C or more. On the other hand, if the ultimate temperature is too high, energy consumption increases and the melting equipment life is shortened. The ultimate temperature is more preferably 1620 ° C or less, and further preferably 1610 ° C or less.
- the melting step in order to set the temperature difference between the melting step 1 and the melting step 2 to 30 ° C or more, for example, (i) using one melting furnace, etc., from the raw material input side to the glass discharge side The molten glass flows into the furnace! /, The melting process 1 is performed in the cake! /, The melting process 2 is performed, and (ii) the interior of one melting furnace is divided into the raw material input side and the glass discharge side 2 And (iii) a method using two melting furnaces.
- the glass substrate of the present invention can be produced by the following float method or the like after dissolving a glass raw material containing a fining agent such as SnO as necessary.
- this glass melt can be formed into a predetermined plate thickness by a float method, and after slow cooling, cut into a desired size and processed by polishing iJ, polishing, or the like.
- the glass melt temperature at the float bath inlet when forming by float method is less than 1260 ° C, preferably 1100 ° C or more and less than 1260 ° C (maximum temperature is within the range of 1100 ° C or more and less than 1260 ° C) ), More preferably up to 1250 ° C, more preferably up to 1100 ⁇ ; 1250 ° C (maximum temperature is within the range of 1100 ⁇ ; 1250 ° C), more preferably up to 1245 ° C, more preferably up to 1100 ⁇ ; 1245 ° C (maximum temperature in the range of 1100 ⁇ ; 1245 ° C), more preferably up to 1235 ° C, more preferably up to 1100 ⁇ ; 1235 ° C (maximum temperature in the range of
- the glass melt temperature at the float bath inlet exceeds 1250 ° C, defects due to molten tin tend to adhere to the glass surface. That is, when the molten tin is volatilized, tin aggregates in the upper space of the float bath, and when the aggregated tin falls onto the top surface of the glass, it becomes a point-like defect, that is, a top spec defect. Further, when the molten tin is oxidized, an amorphous tin oxide is formed, and when the tin oxide adheres to the bottom surface of the glass, a dross defect is caused.
- the temperature of the glass melt at the float bath inlet is preferably up to 1250 ° C, preferably up to 1245 ° C, and more preferable than force S.
- molding may be performed using a known method other than the float process.
- specific examples of other molding methods include the well-known rollout method, downdraw method, and fusion method.
- the glass substrate of the present invention is particularly a thin and large glass substrate, for example, a glass substrate for a liquid crystal display having a thickness of 0.3 to 1.1 mm, a rectangular shape having a side of 2 m or more and a side of 1.8 m or more on the other side. Suitable for!
- the present invention also provides a liquid crystal display panel using the glass substrate of the present invention as a glass substrate.
- a liquid crystal display panel has a gate electrode line and a gate insulating oxide layer formed on the surface, and further a pixel electrode formed on the oxide layer surface.
- a liquid crystal material is sandwiched between the cells to form a cell.
- the liquid crystal display panel includes other elements such as peripheral circuits in addition to such cells.
- Liquid crystal display panel of the present invention The glass substrate of the present invention is used for at least one of a pair of substrates constituting the cell.
- the raw materials of each component are prepared so that the glass after molding has the composition (mol%) shown in Table 1 and Table 2, and is melted at 1550 to 1620 ° C using a platinum crucible. When melting, stir using a platinum stirrer to homogenize the glass. Next, the molten glass is poured out as it is, formed into a plate having a desired thickness, and then slowly cooled to obtain the glasses of Examples 1 to 8.
- Table 3 shows the composition expressed in mol% in Tables 1 and 2 in mass%.
- the glass of Example 1 to Example 8 a Young's modulus of more than 75 GPa, preferably at 79G Pa or more, the linear expansion coefficient of 30 X 10- 7 ⁇ 40 X 10- 7 / ° C, Strain point is 640 ° C or more, density is 2.6 Og / cm 3 or less, 90 ° C, which is an index of acid resistance, 0. Mass loss per unit area after immersion in HCl in IN for 20 hours Is 0.6 mg / cm 2 or less, and it can be confirmed that the glass substrate for display has excellent characteristics.
- the glasses of Examples 1 to 8 have a glass solubility index T of less than 1630 ° C, preferably 1620 ° C or less, it can be confirmed that the glass has excellent glass solubility. .
- the glass of Examples 1 to 8 has a T force of 260. Less than ° C, preferably 1250 ° C or less, more preferably 1245 ° C or less, and further preferably 1235 ° C. Since the devitrification temperature is T or less, it is suitable for forming glass by the float process.
- the substrate is an alkali glass substrate.
- T 2 (.C) (calculated value) 1595 1 600 1600 1600 1605
- Table 4 shows the composition of ingredients prepared as industrial glass raw materials, and Table 5 was obtained.
- the composition of the glass is shown.
- SiO, AlO, BO, MgO, CaO, SrO and BaO are shown in mol% composition
- F, Cl, SO, FeO and SnO are SiO, AlO, BO, MgO.
- the respective content ratios with respect to the total amount of CaO, CaO, SrO and BaO are shown as mass percentages.
- the glass at the upper center of the crucible was drilled into a cylindrical glass having a diameter of 38 mm and a height of 35 mm with a core drill, and the glass having a thickness of 2 to 5 mm including the central axis of the cylindrical glass. Cut into a plate. Both sides of the cut surface were optically polished (mirror polished). From the top surface of the crucible glass 1 to 10 mm, observe the optical polishing surface with a stereomicroscope and measure the number of bubbles with a diameter of 50 m or more in the glass plate. The value is the volume of the glass plate. Divided by the number of bubbles. The results are shown in Table 5.
- Sn-redox in Example 11 was 16%.
- Sn-redox is a value calculated by [Sn 2+ amount / total Sn] measured by measuring Sn 2+ amount in glass at room temperature using Sn-Messbauer spectroscopy. It is. Sn redox is preferably 15-40%, more preferably 15-30%.
- the ⁇ -ray exit of the radiation source, the glass sample, the Pd filter, and the light receiving part of the gas amplification proportional counter (manufactured by LND, model number 45431) were arranged on a straight line 300 to 800 mm long.
- the radiation source As the radiation source, lOmCi 1191 "Sn was used, and the radiation source was moved in the axial direction of the optical system, and the gamma ray energy was changed by the Doppler effect.
- the velocity of the radiation source was a transducer (Toyo And made to vibrate at a speed of 10 to +10 mm / sec in the axial direction of the optical system.
- a glass flat plate obtained by polishing the obtained glass to a thickness of 3 to 7 mm was used as the glass sample.
- the Pd filter is intended to improve the accuracy of ⁇ -ray measurement using a gas-amplifying proportional counter. Thickness that removes the characteristic X-ray generated by the glass sample force when ⁇ -rays are irradiated onto the glass sample 50 Pm foil of ⁇ m.
- the gas amplification proportional counter detects the received ⁇ -rays.
- An electric signal indicating the ⁇ dose from the gas amplification proportional counter was amplified by an amplifying device (manufactured by Kansai Electronics Co., Ltd.) to detect the received light signal.
- the multi-channel analyzer (Wissel CMCA550) was linked to the above speed information.
- the spectrum is obtained by expressing the detection signal from the gas amplification proportional counter on the vertical axis and the speed of the moving radiation source on the horizontal axis (Mossbauer spectroscopy basics and applications 45 to 64). Pp. Hirotoshi Sato and Motomi Katada, published by the Society). The integration time required 2 to 16 days before an evaluable signal / noise ratio was obtained.
- the raw materials were adjusted so as to have the composition of Example 9 in Table 4, and the raw materials were melted to form molten glass, followed by float molding.
- the temperature of the glass melt at the float bath inlet was lowered from 1260 ° C to 1240 ° C, the number of dross generated was reduced to 2/5, and the number of top specs was reduced to 1/5.
- devitrification and the like did not occur, and it was possible to stably perform float forming.
- the glass substrate of the present invention is a rectangular large glass plate with a side of 2 m or more, it can be handled to the same extent as a rectangular glass substrate with a small deflection amount and a handling force with a side of about lm. It is most suitable as a glass substrate that requires multiple chamfering of liquid crystal display panels.
- the alkali-free glass substrate of the present invention is used as a glass substrate in a liquid crystal display panel, particularly a large glass substrate, and has a high definition and a high contrast ratio. Give the panel.
- a liquid crystal display panel particularly a large glass substrate
- the Japanese Patent Application 2006-193278 filed on July 13, 2006, the Japanese Patent Application 2006-301674 filed on November 7, 2006, and the December 28, 2006 application The entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2006-356287 are incorporated herein by reference and incorporated as the disclosure of the specification of the present invention.
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Nonlinear Science (AREA)
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008524807A JP5359271B2 (ja) | 2006-07-13 | 2007-07-10 | 無アルカリガラス基板及びその製造方法並びに液晶ディスプレイパネル |
US12/349,559 US7754631B2 (en) | 2006-07-13 | 2009-01-07 | Alkali-free glass substrate, method for producing it and liquid crystal display panel |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-193278 | 2006-07-13 | ||
JP2006193278 | 2006-07-13 | ||
JP2006-301674 | 2006-11-07 | ||
JP2006301674 | 2006-11-07 | ||
JP2006-356287 | 2006-12-28 | ||
JP2006356287 | 2006-12-28 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/349,559 Continuation US7754631B2 (en) | 2006-07-13 | 2009-01-07 | Alkali-free glass substrate, method for producing it and liquid crystal display panel |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008007676A1 true WO2008007676A1 (fr) | 2008-01-17 |
Family
ID=38923233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/063758 WO2008007676A1 (fr) | 2006-07-13 | 2007-07-10 | substrat de verre sans alcalin, son processus de fabrication et panneaux d'affichage à cristaux liquides |
Country Status (5)
Country | Link |
---|---|
US (1) | US7754631B2 (ja) |
JP (1) | JP5359271B2 (ja) |
KR (1) | KR101028981B1 (ja) |
TW (1) | TW200821274A (ja) |
WO (1) | WO2008007676A1 (ja) |
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JPWO2014175362A1 (ja) * | 2013-04-24 | 2017-02-23 | 旭硝子株式会社 | フロート板ガラス製造方法 |
JP2015134692A (ja) * | 2014-01-16 | 2015-07-27 | 日本電気硝子株式会社 | ガラス基板群及びガラス基板製造方法 |
JP2015051918A (ja) * | 2014-11-06 | 2015-03-19 | 日本電気硝子株式会社 | 無アルカリガラス |
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Also Published As
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KR20080109868A (ko) | 2008-12-17 |
TWI367868B (ja) | 2012-07-11 |
JP5359271B2 (ja) | 2013-12-04 |
JPWO2008007676A1 (ja) | 2009-12-10 |
TW200821274A (en) | 2008-05-16 |
US20090176640A1 (en) | 2009-07-09 |
US7754631B2 (en) | 2010-07-13 |
KR101028981B1 (ko) | 2011-04-12 |
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