KR20120098447A - Resin plate for lower electrode substrate, and lower electrode plate and touch panel using the same - Google Patents

Abstract

PURPOSE: A resin board for a lower electrode board and touch panel using the same are provided to offer good optical characteristics by controlling the tinting of images displayed on an LCD(Liquid Crystal Display). CONSTITUTION: A resin board for a lower electrode board includes a polycarbonate polymer layer in both surfaces of an acrylic polymer layer. The resin board for the lower electrode board includes a retardation value which is lower than ninety nanometers when single color light is emitted as fifty degrees for a perpendicular. The thickness of the polycarbonate polymer layer is lower than zero point one millimeters.

Description

RESIN PLATE FOR LOWER ELECTRODE SUBSTRATE, AND LOWER ELECTRODE PLATE AND TOUCH PANEL USING THE SAME}

This invention relates to the lower electrode board and touch panel which use the resin plate for lower electrode substrates, and the resin plate for lower electrode substrates.

In the resistive touch panel, the lower electrode plate and the upper electrode plate, each of which is formed with a transparent electrode film on one surface of the substrate, are disposed so as to face each other with spacers between the electrodes so that the transparent electrode films face each other. For example, it is provided in a liquid crystal display and is used as an information input device with respect to a liquid crystal display.

When installing a touch panel in a liquid crystal display, a touch panel is normally mounted on a liquid crystal panel first, and a quarter wave plate, a polarizing plate, and a display protection plate are mounted on this touch panel in this order.

In patent document 1, the board | substrate (namely, lower electrode substrate) of the lower electrode plate which is an electrode plate of the side which contacts a liquid crystal panel among two electrode plates which comprise a resistive film type touch panel is a glass plate, and the board | substrate of an upper electrode plate (Ie, upper electrode substrate) A touch panel in which the polyethylene terephthalate resin plate is described. However, about the touchscreen of patent document 1, there exists a problem that a glass plate is heavy and it is easy to be broken.

Japanese Laid-Open Patent Publication 2006-277769

An object of the present invention is to provide a resin plate for a lower electrode substrate which is hard to be broken and has good optical characteristics (for example, suppression of coloring of an image displayed on a liquid crystal display provided with a touch panel).

MEANS TO SOLVE THE PROBLEM The present inventors came to complete this invention, as a result of earnestly researching in order to solve the said subject.

That is, this invention is the following invention.

(1) A resin plate used for a lower electrode substrate of a touch panel, wherein the resin plate for a lower electrode substrate has a polycarbonate resin layer on both sides of an acrylic resin layer.

(2) Re (0), the retardation value when incident the monochromatic light with a wavelength of 590 nm at a 0 degree angle with respect to the normal of the resin plate surface, Re (50) ), Re (0) and Re (50) satisfy | fill Formula: | Re (0) -Re (50) | / 50 <= 1.6 The resin plate as described in said (1).

(3) The resin plate according to the above (1) or (2), wherein the retardation value Re (0) when the monochromatic light having a wavelength of 590 nm is incident at an angle of 50 ° with respect to the normal of the resin plate surface is 90 nm or less.

(4) Said (1) whose thickness of a polycarbonate-type resin layer is 0.1 mm or less? The resin plate in any one of (3).

(5) The film-like thing which has a polycarbonate resin layer on both surfaces of an acryl-type resin layer is melt-extruded from die | dye, sandwiched between a 1st cooling roll and a 2nd cooling roll, and wound up on the said 2nd cooling roll. The said (1) obtained by rolling up and then rolling to a 3rd cooling roll next? The resin plate in any one of (4).

(6) The resin plate as described in said (5) whose 1st cooling roll is a metal elastic roll provided with the metal thin film in the outer peripheral part, and a 2nd cooling roll is a metal roll.

(7) above (1)? The lower electrode plate in which the transparent electrode film is formed in one surface of the resin plate in any one of (6).

(8) A touch panel configured by opposing the lower electrode plate and the upper electrode plate so that the transparent electrode films face each other with a spacer interposed between the lower electrode plate and the upper electrode plate, the lower electrode plate being the The touch panel which is a lower electrode plate as described in (7).

(9) A resin plate having a polycarbonate resin layer on both sides of an acrylic resin layer, wherein the retardation value when a monochromatic light having a wavelength of 590 nm is incident at an angle of 0 ° with respect to the normal of the resin plate surface is set to Re (0). , Re (0) and Re (50), when the retardation value at the time of incidence at an angle of 50 ° are set to Re (50), are represented by the formula: Re (0) -Re (50) /50≤1.6 The resin plate for display members characterized by the above-mentioned.

The resin plate for lower electrode substrates of the present invention is hard to be broken and can suppress the coloring of an image displayed on a liquid crystal display when viewing a liquid crystal display provided with a touch panel in an oblique direction, and is excellent in optical characteristics. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which shows the manufacturing method of the resin plate for lower electrode substrates which concerns on one Embodiment of this invention.

The resin plate for lower electrode substrates of the present invention (hereinafter may be referred to as a "resin plate") has a polycarbonate resin layer on both sides of the acrylic resin layer.

The acrylic resin layer contains an acrylic resin. As an acrylic resin which comprises the said acrylic resin layer, the methacrylic resin which is excellent in transparency and high rigidity is suitable. The said methacrylic resin is resin which has a methyl methacrylate unit as a main component, specifically 50 weight% or more, Preferably it is 70 weight% or more, More preferably, based on all monomers, Methyl methacrylate unit Preferably it is resin containing 90 weight% or more, the methyl methacrylate homopolymer of 100 weight% of methyl methacrylate units may be sufficient, and it is the air of methyl methacrylate and the other monomer copolymerizable with this methyl methacrylate. It may be coalesced.

Examples of the other monomer copolymerizable with methyl methacrylate include ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate and 2-ethyl methacrylate. Methacrylic acid esters other than methyl methacrylate, such as hexyl and 2-hydroxyethyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, and acrylic acid Acrylic esters, such as 2-hydroxyethyl, etc. are mentioned. Moreover, as styrene and substituted styrene, halogenated styrene, such as chloro styrene and bromostyrene, alkyl styrene, such as vinyltoluene and (alpha) -methylstyrene, etc. are mentioned, for example. Moreover, unsaturated acids, such as methacrylic acid and acrylic acid, an acrylonitrile, methacrylonitrile, maleic anhydride, phenyl maleimide, cyclohexyl maleimide, etc. are mentioned. The other monomer copolymerizable with these methyl methacrylates may be used independently, respectively and may be used in combination of 2 or more type.

Acrylic resin may contain rubber particle. For this reason, the impact resistance of a resin plate can be improved. As the rubber particle, for example, an acrylic multilayer structure polymer, 5? Elastomeric unsaturated monomers, such as an acrylic unsaturated monomer, to 80 weight part of rubbery polymers 20? And graft copolymers obtained by graft polymerization of 95 parts by weight.

The acrylic multilayer structure polymer is an elastomer layer of 20? The polymer inherent about 60 weight% is preferable, The polymer which has a hard layer as an outermost layer is preferable, and the polymer which has a hard layer as an innermost layer is preferable.

The elastomer layer is preferably a layer of an acrylic polymer having a glass transition point (Tg) of less than 25 ° C. Specifically, lower alkyl acrylate, lower alkyl methacrylate, lower alkoxyalkyl acrylate, cyanoethyl acrylate, It is made by crosslinking at least one monofunctional monomer selected from the group consisting of acrylamide, hydroxy lower alkyl acrylate, hydroxy lower alkyl methacrylate, acrylic acid and methacrylic acid with a polyfunctional monomer such as allyl methacrylate. It is preferred that it is a layer of polymer.

As a lower alkyl group in the said lower alkyl acrylate etc., it is C1-C1, such as methyl, ethyl, propyl, isopropyl, butyl, t-butyl, pentyl, hexyl group, for example. The linear or branched alkyl group of 6 is mentioned, As a lower alkoxy group in the said lower alkoxyalkyl acrylate, For example, methoxy, ethoxy, propoxy, isopropoxy, butoxy, t-butoxy 1 to 3 carbon atoms such as pentyloxy and hexyloxy group; 6 is a linear or branched alkoxy group. Moreover, when making the said monofunctional monomer into a copolymer as a main component, you may copolymerize other monofunctional monomers, such as styrene and substituted styrene, as a copolymerization component, for example.

It is preferable that the said hard layer is a layer of the acryl-type polymer whose Tg is 25 degreeC or more, Specifically, it is C1-C? It is preferable that it is a layer which superposed | polymerized the alkyl methacrylate which has an alkyl group of 4 individually or as a main component. The carbon number 1? As an alkyl group of 4, a linear or branched alkyl group, such as methyl, ethyl, propyl, isopropyl, butyl, t-butyl, is mentioned, for example.

Carbon number 1? When the alkyl methacrylate having an alkyl group of 4 is used as a copolymer as a main component, other copolymers such as alkyl methacrylate, alkyl acrylate, styrene, substituted styrene, acrylonitrile and methacrylonitrile A functional monomer may be used and polyfunctional monomers, such as allyl methacrylate, may be added and it may be set as a crosslinked polymer. As an alkyl group in the said alkyl methacrylate etc., it is the same carbon number as what was illustrated by the lower alkyl group mentioned above, for example. And a linear or branched alkyl group of 6, and the like.

Said acrylic multilayer structure polymer is described, for example in Unexamined-Japanese-Patent No. 55-27576, Unexamined-Japanese-Patent No. 6-80739, Unexamined-Japanese-Patent No. 49-23292, etc., for example.

5? 80 parts by weight of an ethylenically unsaturated monomer to a rubbery polymer 20? In the graft copolymer obtained by graft polymerization of 95 parts by weight, as the rubbery polymer, for example, diene rubber such as butadiene rubber, acrylonitrile / butadiene copolymer rubber, styrene / butadiene copolymer rubber, polybutylacryl And acrylic rubbers such as late, polypropyl acrylate and poly-2-ethylhexyl acrylate, and ethylene / propylene / non-conjugated diene rubbers. Moreover, ethylene, acrylonitrile, alkyl (meth) acrylate, etc. are mentioned as an ethylenic monomer used for graft copolymerization to this rubbery polymer, for example. These graft copolymers are described, for example, in JP-A-55-147514, JP-A-47-9740, and the like.

The amount of rubber particles used is usually 3 to 3 parts by weight of acrylic resin. 150 parts by weight, preferably 4? 50 parts by weight, more preferably 5? 30 parts by weight. The more the amount of rubber particles used, the more the impact resistance of the resin plate is improved and tends to be difficult to be broken even when pressed. However, when the amount of the rubber particles is excessively large, the surface hardness of the resin plate may be lowered.

On the other hand, the polycarbonate-based resin layer contains a polycarbonate resin. As a polycarbonate resin which comprises the said polycarbonate-type resin layer, carbonate prepolymer is solid in addition to resin obtained by making a dihydric phenol and a carbonylating agent react by an interfacial polycondensation method, melt transesterification method, etc., for example. Resin obtained by superposing | polymerizing by a transesterification method, resin obtained by superposing | polymerizing by a ring-opening polymerization method, etc. are mentioned.

Examples of the dihydric phenol include hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, bis {(4-hydroxy-3,5- Dimethyl) phenyl} methane, 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 2,2-bis (4-hydroxyphenyl) Propane (commonly known as bisphenol A), 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis {(4-hydroxy-3,5-dimethyl) phenyl} propane, 2 , 2-bis {(4-hydroxy-3,5-dibromo) phenyl} propane, 2,2-bis {(3-isopropyl-4-hydroxy) phenyl} propane, 2,2-bis { (4-hydroxy-3-phenyl) phenyl} propane, 2,2-bis (4-hydroxy phenyl) butane, 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2- Bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 2,2-bis (4-hydroxyphenyl) pentane, 2, 2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4-hydroxy Hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -4-isopropylcyclohexane, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 9 , 9-bis (4-hydroxyphenyl) fluorene, 9,9-bis {(4-hydroxy-3-methyl) phenyl} fluorene, α, α'-bis (4-hydroxyphenyl) -o -Diisopropylbenzene, α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene, α, α'-bis (4-hydroxyphenyl) -p-diisopropylbenzene, 1, 3-bis (4-hydroxyphenyl) -5,7-dimethyladamantane, 4,4'-dihydroxydiphenylsulfone, 4,4'-dihydroxydiphenylsulfoxide, 4,4'- Dihydroxy diphenyl sulfide, 4,4'- dihydroxy diphenyl ketone, 4,4'- dihydroxy diphenyl ether, 4,4'- dihydroxy diphenyl ester, etc. are mentioned and are required. Depending on the two or more of them may be used.

Among them, bisphenol A, 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxy Phenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1- Divalent phenols selected from bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane and α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene alone, or It is preferable to use 2 or more types, Particularly, bisphenol A is used alone, or 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane and bisphenol A, 2,2-bis Combination with at least one divalent phenol selected from {(4-hydroxy-3-methyl) phenyl} propane and α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene is preferred. .

Examples of the carbonylating agent include carbonyl halides such as phosgene, carbonate esters such as diphenyl carbonate, and haloformates such as dihalomate of dihydric phenol, and the like. The above can also be used.

In order to improve adhesiveness with an acrylic resin layer, you may contain an acrylic resin in a polycarbonate-type resin layer. Specifically, the polycarbonate resin layer contains an acrylic resin in an amount of 0.01? To 100 parts by weight of the polycarbonate resin. It is preferable that it is comprised from the polycarbonate resin composition contained in 1 weight part ratio. As said acrylic resin, the same acrylic resin as resin used for the above-mentioned acrylic resin layer can be employ | adopted, and resin of low molecular weight is used preferably. Preferable molecular weight range is 1,000? 100,000. When this molecular weight is too low, an acrylic resin will volatilize at the time of extrusion molding, and when too high, an acrylic resin may phase-separate with a polycarbonate resin, and may fall light transmittance.

In addition, each composition of the polycarbonate-type resin layer extended on both surfaces of an acryl-type resin layer may be mutually same, and may differ. Moreover, you may add 1 type (s) or 2 or more types of additives, such as a light stabilizer, a ultraviolet absorber, antioxidant, a flame retardant, an antistatic agent, to a polycarbonate resin layer and an acrylic resin layer, respectively, as needed.

Since the resin plate of this invention has a polycarbonate resin layer on both surfaces of an acryl-type resin layer, it is hard to be broken and even if it sees the liquid crystal display provided with the touch panel which uses this resin plate for a lower electrode substrate from a diagonal direction. The display image of the liquid crystal display is colored and does not appear, and the optical characteristic is good.

The resin plate is preferably manufactured by laminating and unifying an acrylic resin layer and a polycarbonate resin layer laminated on both surfaces thereof by coextrusion molding. This coextrusion molding is carried out by kneading and kneading the material of the acrylic resin layer and the material of the polycarbonate resin layer, respectively using a two- or three-axis single screw or twin screw extruder, followed by a feed block die or multi manifold die. It can carry out by laminating | stacking through etc. The molten resin laminated and integrated may be cooled and solidified using, for example, a roll unit. The resin plate manufactured by co-extrusion molding is preferable at the point which is easy to secondary shape compared with the resin plate manufactured by bonding using an adhesive or an adhesive agent.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment which manufactures a resin plate by co-extrusion molding is demonstrated in detail with reference to FIG. As shown in the figure, first, the material of the acrylic resin layer and the material of the polycaponate resin layer are melt-kneaded by heating with separate extruders 1 and 2, respectively, and fed to the feed block 3, respectively, to be melt-laminated. After integration, it extrudes from the die 4.

Subsequently, the sheet-like film-like molten resin extruded from the die 4 is sandwiched between the first cooling roll 5 and the second cooling roll 6 which are arranged in the substantially horizontal direction so as to face each other. By 7), it can cool gradually and the resin plate 8 can be obtained.

The thickness of the resin plate 8 obtained can be adjusted by adjusting the thickness of molten resin, the space | interval of the 1st, 2nd cooling rolls 5 and 6, a casting speed | rate, etc.

At least one of the 1st, 2nd cooling rolls 5 and 6 is connected to rotation drive means, such as a motor, and is comprised so that both rolls may rotate at predetermined | prescribed main speed. In both rolls, the 2nd cooling roll 6 is a winding roll by which the sheet-like resin plate after winding between both rolls is rolled up.

Examples of the first and second cooling rolls 5 and 6 include metal rolls having rigidity, metal elastic rolls having elasticity, and the like. As said metal roll, a drilled roll, a spiral roll, etc. are mentioned, for example. The metal elastic roll includes, for example, a shaft roll and a cylindrical metal thin film disposed to cover the outer circumferential surface of the shaft roll and in contact with the molten resin, and a temperature controlled fluid such as water or oil between the shaft roll and the metal thin film. The roll enclosed by the temporary seal and the roll which wound the metal belt on the surface of the rubber roll etc. are mentioned.

Although the 1st, 2nd cooling rolls 5 and 6 may be comprised by the 1 type chosen from a metal roll and a metal elastic roll, it is preferable to be comprised combining the metal roll and a metal elastic roll.

By combining a metal roll and a metal elastic roll, the resin plate in which the retardation value was reduced can be obtained. That is, when the molten resin is sandwiched between the metal roll and the metal elastic roll, the metal elastic roll elastically deforms in a concave shape along the outer circumferential surface of the metal roll with the molten resin therebetween, and the metal elastic roll and the metal roll sandwich the molten resin. In contact with the predetermined contact length.

For this reason, a metal roll and a metal elastic roll are crimped | bonded by surface contact with respect to molten resin, and the molten resin clamped between these rolls is formed into a film, being pressurized uniformly on surface.

As a result, the deformation | transformation at the time of film forming is reduced, and the resin plate in which the retardation value was reduced is obtained.

Moreover, when combining a metal roll and a metal elastic roll, it is preferable to make a metal elastic roll the 1st cooling roll 5, and a metal roll the 2nd cooling roll 6. As shown in FIG. For this reason, the retardation value (for example, Re (0) or Re (50)) of incident light in wavelength 590nm of the resin plate obtained can be reduced more.

The molten resin sandwiched between the first cooling roll 5 and the second cooling roll 6 is wound around the second cooling roll 6, and is then taken up and wound up by a take-up roll. At this time, the third cooling roll 7 may be formed after the second cooling roll 6. For this reason, since molten resin cools gradually, the retardation value of the resin plate obtained can be reduced. It does not specifically limit as a 3rd cooling roll, The conventional metal roll conventionally used by extrusion molding can be employ | adopted. As such a metal roll, a drilled roll, a spiral roll, etc. are mentioned as a specific example. It is preferable that the surface state of the 3rd cooling roll 7 is a mirror surface.

In the case of forming the third cooling roll 7, the molten resin wound around the second cooling roll 6 passes between the second cooling roll 6 and the third cooling roll 7 to form a third cooling roll. (7) to hang. A predetermined gap may be formed between the second cooling roll 6 and the third cooling roll 7 to be in a released state, or may be sandwiched between both rolls. After the third cooling roll 7, the fourth cooling roll, the fifth cooling roll, and the n-th cooling roll (n is natural water) and a plurality of cooling rolls are formed and wound around the third cooling roll 7. The hooked film may be wound on the next cooling roll one after another.

The resin plate is usually in the form of a sheet or film, and the thickness thereof is usually 0.1? 3 mm and 0.1? It is preferable that it is 2 mm, and 0.1? It is more preferable that it is 1.5 mm, and 0.1? It is more preferable that it is 1 mm. Since a resin plate consists of an acryl-type resin layer and a polycarbonate-type resin layer, it is hard to be broken and can make thickness small. In the resin plate, each of the polycarbonate-based resin layers laminated on both surfaces of the acrylic resin layer is preferably 0.1 mm or less, and preferably 0.005? It is more preferable that it is 0.1 mm. 0.01? It is more preferable that it is 0.1 mm, and it is 0.05? It is especially preferable that it is 0.1 mm. When the thickness of the polycarbonate-based resin layer is too thick, when the liquid crystal display provided with the touch panel using the resin plate for the lower electrode substrate is viewed in the inclined direction, the display image of the liquid crystal display may be colored. On the other hand, when the thickness of a polycarbonate-type resin layer is too thin, there exists a possibility that a resin plate may become easily broken.

In addition, each thickness of the polycarbonate-type resin layer laminated | stacked on both surfaces of an acryl-type resin layer may be mutually same, and may differ. The thickness of the acrylic resin layer may be appropriately adjusted to the thickness of the entire resin plate and the thickness of the polycarbonate resin layer. It is preferable that it is 99%.

It is preferable that Re (50) is 90 nm or less, as for the resin plate, it is more preferable that it is 80 nm or less, and it is still more preferable that it is 70 nm or less. When Re (50) is 90 nm or less, coloring of the display image of the liquid crystal display in the case of viewing the liquid crystal display provided with the touch panel which uses a resin plate for a lower electrode substrate from the diagonal direction can be suppressed more. . Re (50) is a retardation value when the monochromatic light having a wavelength of 590 nm is incident at an angle of 50 degrees with respect to the normal of the resin plate surface.

It is preferable that Re (0) is 50 nm or less, as for the resin plate, it is more preferable that it is 47 nm or less, and it is still more preferable that it is 45 nm or less. When Re (0) is too big | large, when the liquid crystal display provided with the touch panel which uses this resin plate for a lower electrode substrate is seen from a front direction, there exists a possibility that the display image of a liquid crystal display may appear colored.

When Re (0) is 50 nm or less, coloring of a display image at the time of seeing a touch panel from a front direction can be suppressed. Re (0) is a retardation value when the monochromatic light having a wavelength of 590 nm is incident at an angle of 0 ° with respect to the normal of the resin plate surface.

In the resin plate, Re (0) and Re (50) are represented by the formula: Re (0) -Re (from the viewpoint of suppressing the coloring of the display image of the liquid crystal display when the screen of the touch panel is viewed in the oblique direction. 50) | 50 is preferably satisfied.

As for the value of | Re (0) -Re (50) | / 50 prescribed | regulated by this formula, it is more preferable that it is 1.4 or less, It is further more preferable that it is 1.2 or less, It is especially preferable that it is 1 or less. When Re (0) and Re (50) satisfy the relationship of the above formula, the display image of the liquid crystal display in the case of viewing the liquid crystal display provided with the touch panel which uses a resin plate for a lower electrode substrate from the diagonal direction. The coloring of can be suppressed more. Re (0) -Re (50) / 50 is a retardation value when a single color light having a wavelength of 590 nm is incident at an angle of 0 ° with respect to the normal of the resin plate surface, and is incident at an angle of 50 °. When the rate of change of the retardation value is expressed and the rate of change exceeds 1.6, the color difference between the coloration of the display image when the touch panel is viewed from the front direction and the coloration of the display image when the display panel is viewed from the oblique direction is increased. There is a fear that the coloring is more emphasized and visually recognized.

In order to satisfy the said formula, the film-form thing which has a polycarbonate-type resin layer on both surfaces of an acryl-type resin layer is melt-extruded from die | dye, and is sandwiched between a 1st cooling roll and a 2nd cooling roll, for example. The resin plate may be manufactured by winding the second cooling roll and reducing the value of Re (0) -Re (50) / 50. The first cooling roll is a metal elastic roll and second cooling. It is more preferable to make a roll a metal roll. The third cooling roll may be formed after the second cooling roll, and after the third cooling roll, the fourth cooling roll, the fifth cooling roll, the nth cooling roll (where n is natural water) and a plurality of rolls may be formed. You may form.

A resin plate having a polycarbonate resin layer on both surfaces of an acrylic resin layer, wherein Re (0) and Re (50) satisfy a formula: Re (0) -Re (50) /50≤1.6 The change rate of the retardation value when the monochromatic light of wavelength 590 nm is incident at the angle of 0 degree with respect to the normal line of a resin plate surface, and the rate of change of the retardation value at the time of incident at the angle of 50 degree are in the predetermined range. The color difference of the coloring in the case where a resin plate is seen from a front direction and the inclination direction is small, and can be used for various display member uses, For example, as a surface protection plate of a liquid crystal display, the surface protection plate of a touch panel, etc. Can be used.

At least one surface of the resin plate may be a mat surface having an uneven shape. When one surface of a resin plate is a mat surface, it is preferable that a mat surface is a surface by the side of a liquid crystal panel, ie, the surface on which a transparent electrode film is not formed.

It is preferable that the resin plate of this invention obtained in this way is used as a lower electrode substrate of a touch panel.

When using a resin plate as a lower electrode substrate of a touch panel, a lower electrode plate is produced by first cutting a resin plate to a required magnitude | size, and then forming a transparent electrode film in one surface of this resin plate.

The transparent electrode film is made of a metal oxide. As a metal oxide, ATO (antimony tin oxide), ITO (indium tin oxide), etc. are mentioned, for example, ITO is especially preferable because it is excellent in transparency. The thickness of the transparent electrode film is 5? It is preferable that it is 50 micrometers.

As a method of manufacturing a transparent electrode film, a vacuum vapor deposition method, sputtering method, ionization vapor deposition method, CVD method, etc. are mentioned, for example.

From a viewpoint of improving the adhesiveness of a resin plate and a transparent electrode film, a resin plate may form a resin layer in the surface in which a transparent electrode film is formed. As resin which comprises a resin layer, what is necessary is just resin excellent in transparency. The thickness of the resin layer is 1 nm? It is preferable that it is 5 micrometers. If it is less than 1 nm, sufficient adhesive improvement effect may not be obtained, and when it exceeds 5 micrometers, when the liquid crystal display provided with the touch panel which uses the resin plate for a lower electrode board | substrate is seen from a diagonal direction, the display of a liquid crystal display There is a fear that the image may appear colored.

The resistive touch panel is configured such that the upper electrode plate and the lower electrode plate face each other such that the transparent electrode films of the two electrode plates face each other with a spacer interposed therebetween.

When installing a touch panel on a liquid crystal display, the lower electrode plate is brought into contact with the liquid crystal panel to be installed.

The upper electrode plate is produced by forming a transparent electrode film on one surface of the upper electrode substrate.

In the resistive touch panel, the upper electrode substrate is preferably flexible because the pressed upper electrode plate is in contact with the lower electrode plate so that the pressed position is detected. In terms of flexibility, the thickness of the upper electrode substrate is 10? It is preferable that it is 400 micrometers.

As the upper electrode substrate, a resin film excellent in transparency is used, and polyethylene terephthalate is usually used. In addition, the resin plate of this invention may be used for an upper electrode board | substrate, and both board | substrates of an upper electrode board | substrate and a lower electrode board | substrate may be used as the resin board of this invention. In this case, the thickness of the resin plate which comprises both board | substrates may mutually be same or different.

The resin plate is not limited to use as the lower electrode substrate of the resistive touch panel, but can also be used as an electrode substrate of another touch panel, for example, an electrode substrate of a capacitive touch panel. A capacitive touch panel is formed by forming a protective film on a transparent electrode film of an electrode plate having a transparent electrode film on one surface of an electrode substrate. In the case of providing the capacitive touch panel in the liquid crystal display, the electrode substrate surface is brought into contact with the liquid crystal panel.

As this electrode substrate, although a glass plate is normally used, there exists a problem that a glass plate is heavy and it is easy to be broken. By using the resin plate of this invention instead of a glass plate, this problem can be improved.

As a use of a touch panel, the display window of a portable game machine, the display of a portable car navigation system and a portable information terminal, the display of a bank ATM, the operation panel of an industrial machine, etc. are mentioned. The touch panel which uses the resin plate of this invention as a lower electrode board | substrate is a light weight in that a lower electrode board | substrate is a resin plate of this invention, and since it is hard to be broken, the touch panel by reducing the thickness of a resin plate It is possible to reduce the thickness, and in particular, use as a portable application is preferable.

Example

Hereinafter, although the Example of this invention is shown, this invention is not limited to these.

The structure of the extrusion apparatus used by the following example and the comparative example is as follows.

? Extruder (1): The extruder (Toshiba Machine Co., Ltd. product) with a screw diameter of 65 mm, a single shaft, and the vent was used.

? Extruder (2): An extruder (manufactured by Hitachi Shipbuilding Co., Ltd.) with a screw diameter of 45 mm, a single shaft, and a vent was used.

? Feed block (3): The feed block (made by Hitachi Shipbuilding Co., Ltd.) of 2 types and 3 layers distribution was used.

? Die 4: T die (Hitachi Shipbuilding Co., Ltd.) of lip width 1400 mm and lip spacing 1 mm was used.

1st, 2nd, 3rd cooling rolls (5, 6, 7): The horizontal roll, the surface length of 1400 mm, and the cooling roll of diameter 300mmphi were used.

The 1st, 2nd, 3rd cooling rolls 5, 6, and 7 are demonstrated more concretely, The metal elastic roll was used for the 1st cooling roll 5. As shown in FIG. In the metal elastic roll, a metal thin film is disposed so as to cover the outer circumferential surface of the shaft roll, and a roll in which a fluid is sealed between the shaft roll and the metal thin film is employed.

A shaft roll, a metal thin film, and a fluid are as follows.

Shaft roll: stainless steel

Metal thin film: mirror metal sleeve made of stainless steel with a thickness of 2 mm

Fluid: It is oil, and temperature control of this oil made temperature control of the metal elastic roll possible. More specifically, the oil was heated and cooled by ON-OFF control of the temperature controller to enable temperature control, and was circulated between the shaft roll and the metal thin film.

High rigid metal rolls were used for the second and third cooling rolls 6 and 7. This metal roll is a stainless steel spiral roll whose surface state is mirror surface.

Resin used by the Example and the comparative example is the following two types.

? Resin 1: The polycarbonate resin "Caliba 301-10" by Sumitomo Dow Co., Ltd. of heat distortion temperature (Th) 140 degreeC was used.

? Resin 2: The methacryl resin "Smibex EX" by Sumitomo Chemical Co., Ltd. of heat distortion temperature (Th) 100 degreeC was used.

[Example 1? 4 and Comparative Example 1

<Production of resin board>

First, the extruder 1, 2, the feed block 3, the die 4, the 1st, 2nd, 3rd cooling rolls 5, 6, 7 were arrange | positioned as shown in FIG. Next, the resin of the kind shown in Table 1 as the resin layer A was melt-kneaded in the extruder 1, the resin of the kind shown in Table 1 as the resin layer B was melt-kneaded in the extruder 2, respectively, and it supplies to a feed block, The film-like molten resin in which the resin layer B supplied to the feed block from the extruder 2 was laminated on both surfaces of the resin layer A supplied to the feed block from the extruder 1 was extruded from the die 4.

Subsequently, the film-form molten resin extruded from the die 4 is sandwiched between the first cooling roll 5 and the second cooling roll 6 which face each other, and then wound around the third cooling roll 7, Molding and cooling were carried out, and the resin plate of the 3-layered constitution which has the thickness shown in Table 1 which laminated | stacked the resin layer B on both surfaces of the resin layer A was obtained. In each obtained resin plate, each composition and thickness of the laminated resin layer (B) of both surfaces of the resin layer (A) are the same.

In addition, "thickness" in the extruder 1 of Table 1 has shown the thickness of the resin layer A, "thickness" in the extruder 2 has shown each thickness of the resin layer B, and "total thickness" "Represents the thickness of the whole resin plate obtained.

<Evaluation>

About each obtained resin plate, coloring by the retardation value and the diagonal direction was evaluated. While each evaluation method is shown below, the result is combined with Table 1 and shown.

(Retardation value (Re (0), Re (50)))

Retardation value when a monochromatic light having a wavelength of 590 nm was incident at a 0 degree angle with respect to the normal of the resin plate surface using an automatic birefringence meter "KOBRA-VR" manufactured by Oji Measuring Instruments Co., Ltd. (Re (0) ) And a retardation value (Re (50)) when incident at an angle of 50 °. From the values of Re (0) and Re (50), (│Re (0) -Re (50) | 50) was obtained.

[Coloring when seen from an oblique direction]

The obtained resin plate was used as a lower electrode substrate of a touch panel, and the following evaluation was performed assuming that the touch panel is provided on a liquid crystal display.

First, one surface of the resin plate obtained above and one surface of the 1st polarizing plate were overlapped. Next, the second polarizing plate was superposed on the other surface of the resin plate so that the first polarizing plate and the polarizing axis were orthogonal to each other. Sumitomo Chemical Co., Ltd. product "Sumikaran SG" was used for the 1st, 2nd polarizing plate.

And while illuminating a 2nd polarizing plate surface with the light of a three wavelength fluorescent lamp ("Lupekaes" manufactured by Mitsubishi Electric Osram Co., Ltd.), the 2nd polarizing plate surface is sandwiched between the 2nd polarizing plate in the 45 degree direction of the inclination of the 2nd polarizing plate surface. When the other side of the resin plate was seen, it was visually observed whether the side looked colored. In addition, the determination criteria are as follows.

(Circle): It does not appear colored.

X: It looks colored.

Comparative Example 2

The resin of the kind shown in Table 1 was melt-kneaded in the extruder 1, and was supplied in order of the feed block 3 and the die 4. And the molten resin extruded from the die 4 is pinched | interposed between the 1st cooling roll 5 and the 2nd cooling roll 6 which oppose, and wound around the 3rd cooling roll 7, and is molding? It cooled and obtained the single layer board which has the thickness shown in Table 1.

About the obtained single layer board, coloring similarly to the said Example 1 as viewed in the retardation value and the inclination direction was evaluated. The results are shown in Table 1.

1, 2: extruder
3: feed block
4: Die
5: first cooling roll
6: second cooling roll
7: third cooling roll
8: resin plate

Claims (9)

As a resin plate used for the lower electrode substrate of a touch panel,
The resin board for lower electrode substrates which has a polycarbonate resin layer on both surfaces of an acryl-type resin layer. The method of claim 1,
The retardation value when the monochromatic light having a wavelength of 590 nm was incident at an angle of 0 ° with respect to the normal of the resin plate surface was set to Re (0) and the retardation value when the incident light was incident at an angle of 50 °. When Re (0) and Re (50) satisfy the formula: Re (0) -Re (50) /50≤1.6, the resin plate for lower electrode substrate. The method of claim 1, wherein
The resin plate for lower electrode substrates whose retardation value Re (50) when the monochromatic light of wavelength 590nm is made incident on an angle of 50 degrees with respect to the normal of a resin plate surface is 90 nm or less. The method of claim 1,
The resin plate for lower electrode substrates whose thickness of a polycarbonate-type resin layer is 0.1 mm or less. The method of claim 1,
The film-like thing which has a polycarbonate resin layer on both surfaces of an acryl-type resin layer is melt-extruded from die | dye, sandwiched between a 1st cooling roll and a 2nd cooling roll, and wound around the said 2nd cooling roll, and then The resin plate for lower electrode substrates obtained by winding up on a 3rd cooling roll. The method of claim 5, wherein
The resin plate for lower electrode substrates whose 1st cooling roll is a metal elastic roll provided with the metal thin film in the outer peripheral part, and a 2nd cooling roll is a metal roll. The lower electrode plate in which the transparent electrode film is formed in one surface of the resin plate for lower electrode substrates in any one of Claims 1-6. A touch panel configured to face a lower electrode plate and an upper electrode plate so as to face each other with a spacer interposed between the lower electrode plate and the upper electrode plate so that the transparent electrode films face each other.
The touch panel, wherein the lower electrode plate is the lower electrode plate according to claim 7. As a resin plate which has a polycarbonate-type resin layer on both surfaces of an acrylic resin layer,
The retardation value when the monochromatic light having a wavelength of 590 nm was incident at an angle of 0 ° with respect to the normal of the resin plate surface was set to Re (0) and the retardation value when the incident light was incident at an angle of 50 °. In this case, Re (0) and Re (50) satisfy the formula: Re (0) -Re (50) /50≤1.6.

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