WO2016080246A1 - 保護フィルム付き透明導電性フィルム - Google Patents
保護フィルム付き透明導電性フィルム Download PDFInfo
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- WO2016080246A1 WO2016080246A1 PCT/JP2015/081612 JP2015081612W WO2016080246A1 WO 2016080246 A1 WO2016080246 A1 WO 2016080246A1 JP 2015081612 W JP2015081612 W JP 2015081612W WO 2016080246 A1 WO2016080246 A1 WO 2016080246A1
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- transparent conductive
- film
- protective film
- conductive film
- main surface
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
Definitions
- the present invention relates to a transparent conductive film with a protective film.
- a transparent conductive film having an optical adjustment layer and a transparent conductive layer on one main surface of a film substrate is known.
- Transparent conductive films are used for touch panels and the like.
- a technique for increasing the scratch resistance of a transparent conductive film there is a technique of forming an optical adjustment layer by a dry film forming method typified by a sputtering method.
- the transparent conductive film is typically produced by a roll-to-roll method in which each layer is continuously formed on a long film substrate.
- the transparent conductive film is cut from a rolled state into a sheet having a predetermined shape and size, and after heat treatment for crystallizing the transparent conductive layer, fine wiring is performed by patterning and etching.
- the post-processing may be performed to form.
- Patent Document 1 Japanese Patent No. 5245893
- the sheet of the transparent conductive film with a protective film having excellent scratch resistance has a problem that curling (warping) occurs with time after the heat treatment and the curling gradually increases.
- curling causes time after the heat treatment and the curling gradually increases.
- the curl becomes large, it becomes difficult to handle the sheet of the transparent conductive film with a protective film in the touch panel device manufacturing process (for example, the heat crystallization process of the transparent conductive layer or the bonding process with other materials).
- conventional touch panels have many small applications such as mobile phones, it is customary to evaluate curl with a sheet of small size (for example, 10 cm ⁇ 10 cm), and the problem of curl has not been revealed in recent years.
- the touch panel becomes larger (for example, A4 size or larger), curling tends to be large, and the problem of curling has become apparent.
- the same transparent conductive film with a protective film is cut into a size of 10 cm ⁇ 10 cm and 50 cm ⁇ 50 cm, and curl evaluation is performed.
- the curl of a 10 cm ⁇ 10 cm size sheet is sufficiently small (for example, 5 mm), 50 cm ⁇ 50 cm
- the sheet curl may be very large (eg, 20 mm).
- the transparent conductive film in which an optical adjustment layer is conventionally formed by a wet film formation method typified by a coating method.
- the transparent conductive film in which the optical adjustment layer is formed by a wet film forming method even when a protective film similar to the above is provided, the above-described curl problem hardly occurs.
- the transparent conductive film in which the optical adjustment layer is formed by a wet film formation method has a problem that the scratch resistance is low. Therefore, a transparent conductive film that has high scratch resistance and that does not cause curling problems is desired.
- An object of the present invention is to realize a transparent conductive film which has high scratch resistance and does not cause a problem of curling when formed into a sheet.
- the present inventors set the absolute value of the maximum heat shrinkage rate of the transparent conductive film to a specific range smaller than the absolute value of the maximum heat shrinkage rate of the protective film, thereby achieving the above problems.
- the heat shrinkage rate of the transparent conductive film may vary depending on the direction in the main surface. In that case, the maximum heat shrinkage rate in the main surface is used as the heat shrinkage rate of the transparent conductive film.
- the heat shrinkage rate of the protective film is the same.
- the transparent conductive film with a protective film of the present invention includes a transparent conductive film made of a laminate having at least an optical adjustment layer and a transparent conductive layer in this order on one main surface of the film base. Moreover, the protective film laminated
- the optical adjustment layer includes a sputtering film.
- the transparent conductive film and the protective film have the property of heat shrinking in at least one direction within the main surface. The absolute value of the maximum heat shrinkage (%) in the main surface of the transparent conductive film is smaller than the absolute value of the maximum heat shrinkage (%) in the main surface of the protective film, and the difference is 0.05% to 0 .6%.
- the transparent conductive film with a protective film of the present invention includes a transparent conductive film made of a laminate having at least an optical adjustment layer and a transparent conductive layer in this order on one main surface of the film substrate. Moreover, the protective film laminated
- the optical adjustment layer includes a region having a carbon atom content of 0.2 atomic% or less in the thickness direction.
- the transparent conductive film and the protective film have the property of heat shrinking in at least one direction within the main surface.
- the absolute value of the maximum heat shrinkage (%) in the main surface of the transparent conductive film is smaller than the absolute value of the maximum heat shrinkage (%) in the main surface of the protective film, and the difference is 0.05% to 0 .6%.
- the transparent conductive film with a protective film of the present invention includes a transparent conductive film made of a laminate including at least an optical adjustment layer and a transparent conductive layer in this order on one main surface of the film substrate. Moreover, the protective film laminated
- the moisture permeability of the optical adjustment layer is 1.0 g / m 2 ⁇ day or less.
- the transparent conductive film and the protective film have the property of heat shrinking in at least one direction within the main surface.
- the absolute value of the maximum heat shrinkage (%) in the main surface of the transparent conductive film is smaller than the absolute value of the maximum heat shrinkage (%) in the main surface of the protective film, and the difference is 0.05% to 0 .6%.
- the sheet is heated at a temperature of 140 ° C. for 90 minutes in the state where the transparent conductive film with a protective film is cut into a square or rectangular sheet.
- the absolute value of curl when exposed to an environment of 25 ° C. and 55% relative humidity for 1 minute to 4 hours is 2.1% or less of the diagonal length of the sheet throughout the entire exposure time.
- the transparent conductive film with a protective film of the present invention is heated at 140 ° C. for 90 minutes in a state of being cut into a square or rectangular sheet having an area of 600 cm 2 or more. Subsequently, the absolute value of curl generated when exposed to an environment having a temperature of 25 ° C. and a relative humidity of 55% for 1 minute to 4 hours is 15 mm or less throughout the entire exposure time.
- the interlayer adhesion between the protective film and the film substrate is the smallest among all the interlayer adhesions between the respective layers.
- the moisture permeability of the transparent conductive film at a temperature of 40 ° C. and a relative humidity of 90% is 1.0 g / m 2 ⁇ day or less.
- the sheet is heated at 140 ° C. for 90 minutes with the transparent conductive film with a protective film being cut into a square or rectangular sheet, and then the temperature is 25.
- the measured value of curl generated when exposed to an environment of 55 ° C and 55% relative humidity for 1 minute to 4 hours is a positive value
- the measured value of curl on the protective film side When the value is a negative value, the average value of the measured curl values at the four vertices of the sheet becomes a negative value throughout the exposure time.
- the sheet is heated at a temperature of 140 ° C. for 90 minutes with the transparent conductive film with a protective film being cut into a square or rectangular sheet, and then the temperature is increased.
- the direction of curl at the four vertices that occurs when exposed to an environment of 25 ° C. and 55% relative humidity for 1 minute to 4 hours is the curl toward the protective film throughout the entire exposure time.
- the film substrate and the protective film are both made of polyethylene terephthalate, and both have the maximum heat shrinkage in the MD (Machine Direction) direction (flow direction). Rate.
- a transparent conductive film that has high scratch resistance and does not cause curling to cause a problem when formed into a sheet is realized.
- FIG. 1 The schematic diagram of one example of the transparent conductive film 10 with a protective film of this invention is shown in FIG.
- the optical adjustment layer 12 is formed on one main surface of the film substrate 11, and the transparent conductive layer 13 is formed on the optical adjustment layer 12.
- a protective film 14 is bonded to the main surface of the film base 11 opposite to the transparent conductive layer 13 with, for example, an adhesive (not shown).
- a laminate of the film substrate 11, the optical adjustment layer 12, and the transparent conductive layer 13 is referred to as a transparent conductive film 15.
- the transparent conductive film 15 and the protective film 14 are usually composed of a resin film.
- the resin film is likely to change its dimensions by heating, and generally heat-shrinkable in at least one direction within the main surface. Therefore, the transparent conductive film 15 and the protective film 14 are easily heat-shrinked in at least one direction within the main surface.
- the absolute value of the maximum heat shrinkage rate of the transparent conductive film 15 is smaller than the absolute value of the maximum heat shrinkage rate of the protective film 14. Note that the heat shrinkage rate of the transparent conductive film 15 is predominantly the heat shrinkage rate of the film base 11 having a large thickness.
- the film base 11 may have different thermal shrinkage rates depending on the direction in the main surface. Therefore, the transparent conductive film 15 may have different thermal shrinkage rates depending on directions in the main surface. As the maximum heat shrinkage rate of the transparent conductive film 15, the maximum heat shrinkage rate is used in the main surface.
- the protective film 14 may have a different thermal shrinkage rate depending on the direction in the main surface. Also for the protective film 14, the maximum heat shrinkage rate is used in the main surface as the maximum heat shrinkage rate.
- the maximum heat shrinkage of the transparent conductive film with a protective film 10 is preferably 0.06% to 0.68%, more preferably 0.10% to 0.64%, and further 0.10% to 0.54%. preferable. If the maximum heat shrinkage ratio is within the above range, fine wiring processing of the transparent conductive layer 13 can be performed with high accuracy even when the heating process is performed.
- the film substrate 11 is made of, for example, polyethylene terephthalate, polyethylene naphthalate, polyolefin, polycycloolefin, polycarbonate, polyether sulfone, polyarylate, polyimide, polyamide, polystyrene, norbornene, or the like.
- the material of the film substrate 11 is not limited to these, but polyethylene terephthalate having excellent transparency, heat resistance, and mechanical properties is particularly preferable.
- the thickness of the film substrate 11 is, for example, 20 ⁇ m or more and 300 ⁇ m or less, preferably more than 40 ⁇ m and 300 ⁇ m or less, but is not limited thereto. However, if the thickness of the film substrate 11 is less than 20 ⁇ m, handling may be difficult. When the thickness of the film substrate 11 exceeds 300 ⁇ m, there may be a problem that the thickness of the transparent conductive film 15 is excessive when mounted on a touch panel or the like.
- the moisture permeability of the film substrate 11 is, for example, 3 g / m 2 ⁇ day or more.
- the surface of the film base 11 on the side of the transparent conductive layer 13 and the surface on the side of the protective film 14 are provided with functional layers such as an easy adhesion layer, an undercoat layer, or a hard coat layer as necessary. May be.
- the easy-adhesion layer has a function of improving the adhesion between the film substrate 11 and a layer (for example, the optical adjustment layer 12) formed on the film substrate 11.
- the undercoat layer has a function of adjusting the reflectance and optical hue of the film substrate 11.
- the hard coat layer improves the scratch resistance of the transparent conductive film 15.
- the functional layer is preferably composed of a composition containing an organic resin.
- the maximum heat shrinkage of the film substrate 11 is preferably 0.05% to 0.65%, more preferably 0.10% to 0.60%, and still more preferably 0.10% to 0.50%. If the maximum thermal shrinkage of the film substrate 11 is less than 0.05%, the compressive stress of the transparent conductive layer 13 becomes too small, and the humidification reliability of the transparent conductive layer 13 may deteriorate. If the maximum thermal shrinkage of the film substrate 11 exceeds 0.65%, the wiring position accuracy may be significantly deteriorated when the transparent conductive layer 13 is patterned to form a wiring.
- the transparent conductive layer 13 is a thin film layer mainly composed of a metal conductive oxide, or a transparent thin film layer mainly composed of a composite metal oxide containing a main metal and one or more impurity metals.
- the transparent conductive layer 13 is not particularly limited as long as it has optical transparency in the visible light region and has conductivity.
- the transparent conductive layer 13 includes, for example, indium oxide, indium tin oxide (ITO: Indium Tin Oxide), indium zinc oxide (IZO: Indium Zinc Oxide), indium gallium zinc oxide (IGZO: Indium Gallium Zinc Oxide). Indium tin oxide is more preferable from the viewpoint of low specific resistance and transmission hue.
- the transparent conductive layer 13 may be amorphous or crystalline, but is more preferably crystalline.
- the transparent conductive layer 13 is crystalline can be confirmed by performing planar TEM observation using a transmission electron microscope (TEM).
- TEM transmission electron microscope
- the area ratio of crystal grains is 50% or less (preferably 0% or more and 30% or less)
- it is assumed that the area is amorphous. If it exceeds (preferably 80% or more), it is assumed to be crystalline.
- the crystalline transparent conductive layer 13 is excellent in wet heat resistance. Since the crystalline transparent conductive layer 13 has a crystal grain boundary, water can easily pass through the grain boundary, and moisture permeability can be increased as compared with an amorphous transparent conductive layer. The moisture permeability of the transparent conductive layer 13 is, for example, 1 g / m 2 ⁇ day. Further, the crystalline transparent conductive layer may be inferior in scratch resistance than the amorphous transparent conductive layer, but the transparent conductive film 15 of the present application includes the optical adjustment layer 12 having excellent scratch resistance. A crystalline transparent conductive layer 13 can be preferably used.
- the indium tin oxide layer formed on the film substrate 11 at a low temperature is amorphous, and is converted from amorphous to crystalline by heat treatment. The indium tin oxide layer has a low surface resistance value when converted to crystalline.
- Specific resistance of the transparent conductive layer 13 is preferably at most 4X10 -4 ⁇ ⁇ cm, more preferably not more than 3.8X10 -4 ⁇ ⁇ cm, or less 3.5X10 -4 ⁇ ⁇ cm but more preferably, and most preferably not more than 3.3X10 -4 ⁇ ⁇ cm, the lower limit is, for example, 1X10 -4 ⁇ ⁇ cm or more.
- the specific resistance of the transparent conductive layer 13 it can be suitably used as a transparent electrode of a large touch panel.
- the specific resistance of the transparent conductive layer 13 is small, it is not necessary to excessively increase the thickness of the transparent conductive layer, and the light transmittance of the transparent conductive layer 13 can be further increased.
- the transparent conductive layer 13 is made thin, the scratch resistance may deteriorate.
- the transparent conductive film 15 of the present application includes the optical adjustment layer 12 having excellent scratch resistance
- the transparent conductive layer is a thin transparent conductive layer having a small specific resistance. 13 can be preferably used.
- the specific resistance of the transparent conductive layer 13 is the surface resistance value ( ⁇ / ⁇ ) of the transparent conductive layer 13 measured by a four-terminal method according to JIS K7194 (1994) and the transparent resistance measured by a transmission electron microscope. It can be determined using the thickness of the conductive layer 13.
- the surface resistance value of the transparent conductive layer 13 is preferably 200 ⁇ / ⁇ or less, more preferably 150 ⁇ / ⁇ or less, still more preferably 100 ⁇ / ⁇ or less, and the lower limit value is, for example, 40 ⁇ / ⁇ or more. If it is the said range, it can be used suitably also as a transparent electrode of a large sized touch panel.
- the protective film 14 is made of, for example, polyethylene terephthalate, polyethylene naphthalate, polyolefin, polycycloolefin, polycarbonate, polyether sulfone, polyarylate, polyimide, polyamide, polystyrene, norbornene, or the like.
- the material of the protective film 14 is not limited to these, the polyethylene terephthalate which is excellent in transparency, heat resistance, and a mechanical characteristic is especially preferable.
- the thickness of the protective film 14 will not be specifically limited if it is the thickness which can handle the transparent conductive film 10 with a protective film favorably, 20 micrometers or more and 300 micrometers or less are preferable, and it is 40 micrometers or more and 300 micrometers or less. More preferred. If the thickness of the protective film 14 is less than 20 ⁇ m, handling may be difficult. Moreover, when the thickness of the protective film 14 exceeds 300 micrometers, there exists a possibility that winding may become difficult.
- the ratio (Ts / Tp) between the thickness Tp of the protective film 14 and the thickness Ts of the film substrate 11 is preferably 0.1 to 3.0, more preferably 0.3 to 2.0, and 0.3 to 1 .5 is more preferred. If Ts / Tp is the said range, the handleability of the transparent conductive film 10 with a protective film can be improved reliably.
- the moisture permeability of the protective film 14 is, for example, 3 g / m 2 ⁇ day or more.
- the maximum heat shrinkage of the protective film 14 is preferably 0.10% to 0.70%, more preferably 0.15% to 0.65%, and still more preferably 0.15% to 0.55%. If the maximum heat shrinkage rate of the protective film 14 is within the above range, there is no possibility that various characteristics of the transparent conductive film 15 are deteriorated.
- the protective film 14 is bonded to the film substrate 11 with, for example, an adhesive (not shown).
- the protective film 14 in this invention needs to peel from the film base material 11, when bonding the transparent conductive film 15 to a touchscreen member, for example.
- the transparent conductive film 15 is destroyed.
- the optical adjustment layer 12 is not peeled off from the film substrate 11 and the transparent conductive layer 13 is not peeled off from the optical adjustment layer 12.
- What is necessary is just to set suitably, for example, it is desirable that it is 3 N / 50mm or less.
- the peel strength of the protective film can be measured by a 180 ° peel test in accordance with JISZ0237.
- the protective film 14 is finally peeled off and discarded when the touch panel is incorporated.
- the adhesive etc. which existed in the interface are peeled in the state adhere
- FIG. If it peels in the state in which the adhesive was adhere
- the transparent conductive film 15 is less susceptible to adverse effects on use.
- the optical adjustment layer 12 is a layer for adjusting the refractive index provided between the film substrate 11 and the transparent conductive layer 13, and the optical characteristics (for example, reflection characteristics) of the transparent conductive film 15 due to the presence of this layer. Can be optimized.
- the optical adjustment layer 12 is a dry optical adjustment layer formed on the film substrate 11 by a dry film formation method, and the composition thereof includes an inorganic oxide, preferably an inorganic oxide.
- the method for forming the optical adjustment layer 12 is not limited as long as it is a dry film-forming method capable of obtaining sufficient scratch resistance, but the sputtering method is particularly preferable.
- a film formed by sputtering can be stably obtained as a particularly dense film as compared with other dry film forming methods (for example, vacuum vapor deposition), an inorganic oxide layer formed by sputtering is used.
- the included optical adjustment layer 12 has excellent scratch resistance.
- the pressure of the sputtering gas is preferably 0.05 Pa to 0.5 Pa, more preferably 0.09 Pa to 0.3 Pa.
- the pressure of the sputtering gas is preferably 0.05 Pa to 0.5 Pa, more preferably 0.09 Pa to 0.3 Pa.
- a denser film can be formed.
- the pressure of the sputtering gas exceeds 0.5 Pa, a dense film may not be obtained.
- the pressure of the sputtering gas is less than 0.05 Pa, the discharge becomes unstable and the optical characteristics (for example, transmittance) of the transparent conductive film 15 may be deteriorated.
- the constituent material of the optical adjustment layer 12 is not particularly limited.
- silicon oxide silicon monoxide (SiO), silicon dioxide (SiO 2 , usually referred to as silicon oxide), silicon oxide (SiOx: x is 1 or more) 2)), aluminum oxide (Al 2 O 3 ), niobium oxide (Nb 2 O 5 ), zirconium oxide (ZrO 2 ), titanium oxide (TiO 2 ), and other inorganic oxides.
- the optical adjustment layer 12 may be a single inorganic oxide layer or an inorganic oxide layer stack in which a plurality of inorganic oxide layers having different main atoms are stacked. Since the optical adjustment layer 12 containing a dry inorganic oxide has higher scratch resistance than the wet optical adjustment layer 22 (FIG. 3 described later), the fine wiring pattern of the transparent conductive layer 13 is prevented from being broken by scratches. Is done.
- the moisture permeability of the optical adjustment layer 12 is, for example, 1.0 g / m 2 ⁇ day or less, preferably 0.8 g / m 2 ⁇ day or less. More preferably 0.6 g / m 2 ⁇ day or less, still more preferably 0.4 g / m 2 ⁇ day or less, and for example 0.001 g / m 2 ⁇ day or more. Preferably, it is 0.01 g / m 2 ⁇ day or more. This is a level which is smaller by about one digit or more than the moisture permeability of the film substrate 11 and the protective film 14.
- the film density of the inorganic oxide layer is sufficiently high, and thus sufficient scratch resistance can be obtained.
- the moisture permeability of the optical adjustment layer 12 is smaller than 0.001 g / m 2 ⁇ day, the film density of the inorganic oxide layer becomes excessively high, the hardness becomes too high, and the flex resistance may be deteriorated.
- the moisture permeability of the optical adjustment layer 12 exceeds 1.0 g / m 2 ⁇ day, the film density is insufficient and the scratch resistance may be deteriorated.
- the moisture permeability of the optical adjustment layer 12 is preferably the lowest of the layers constituting the transparent conductive film 15, so that the optical adjustment layer 12 having a sufficiently high film density can be obtained, and scratch resistance is obtained.
- a transparent conductive film 15 having excellent properties can be obtained.
- the optical adjustment layer 12 preferably has a region that does not substantially contain impurity atoms other than inorganic atoms and oxygen atoms constituting the inorganic oxide. Specifically, the optical adjustment layer 12 has carbon atoms of 0.2 atomic% or less. It is preferable to have a region.
- the carbon atoms that can be included in the optical adjustment layer 12 are, for example, impurity atoms derived from a film base 11 or a hard coat layer (not shown) formed on the film base 11 by a wet method.
- the wet optical adjustment layer 22 (FIG. 3 described later) may contain carbon atoms derived from an organic resin.
- the presence or absence of a region having carbon atoms of 0.2 atomic% or less is determined by performing a depth profile measurement by X-ray photoelectron spectroscopy (commonly known as ESCA: Electron Spectroscopy for Chemical Analysis).
- Carbon atoms lower the film density of the optical adjustment layer 12 and cause a decrease in scratch resistance.
- the optical adjustment layer 12 has a region with carbon atoms of 0.2 atomic% or less, sufficient scratch resistance can be obtained.
- the level is below the apparatus detection limit and may not be detected. Therefore, in this specification, if a carbon atom is 0.2 atomic% or less, it will be judged that the impurity atom is not included substantially.
- the ratio of the thickness of the region having carbon atoms of 0.2 atomic% or less is, for example, 10% or more, Preferably, it is 15% or more, more preferably 20% or more, still more preferably 25% or more, and most preferably 30% or more. Details of how to obtain the “region where the carbon atoms are 0.2 atomic% or less” are described in the [Evaluation of the presence region of impurity atoms (carbon atoms) in the optical adjustment layer] column.
- the ratio of the region where the carbon atom is 0.2 atomic% or less is obtained by calculating the total thickness A (nm) of the dry optical adjustment layer and the thickness B (nm) of the region where the carbon atom is detected in the dry optical adjustment layer. It is obtained by calculating “100 ⁇ (B / A) ⁇ 100” (unit:%). If the region where the carbon atom is 0.2 atomic% or less is 10% or more, sufficient scratch resistance can be obtained. The higher the percentage of the region where the carbon atom is 0.2 atomic% or less, the better. However, due to analytical problems, for example, the carbon atoms constituting the film substrate 11 are detected in the vicinity of the film substrate 11 of the optical adjustment layer 12. Therefore, an analysis result of substantially 100% cannot be obtained.
- the upper limit of the region where the carbon atom is 0.2 atomic% or less is, for example, 90%.
- the optical adjustment layer 12 containing no impurity atoms can be suitably obtained, for example, by forming the film substrate 11 without excessively heating the temperature of the film substrate 11.
- the optical adjustment layer 12 is formed while cooling the side of the film substrate 11 opposite to the side on which the optical adjustment layer 12 is formed to ⁇ 20 ° C. to 15 ° C., preferably ⁇ 20 ° C. to 5 ° C.
- the optical adjustment layer 12 is formed in a state where the film base 11 is cooled, the release of gas components contained in the film base is suppressed, and the optical adjustment layer 12 is less likely to contain impurity atoms.
- the thickness of the optical adjustment layer 12 is, for example, 1 nm or more, preferably 5 nm or more, more preferably 8 nm or more, still more preferably 10 nm or more, and 200 nm or less, preferably Is 100 nm or less, more preferably 80 nm or less, and most preferably 50 nm or less. If the thickness of the optical adjustment layer 12 is less than 1 nm, the scratch resistance of the transparent conductive film 15 may be insufficient. When the thickness of the optical adjustment layer 12 exceeds 200 nm, the bending resistance of the transparent conductive film 15 may be deteriorated.
- the moisture permeability of the transparent conductive film 15 at a temperature of 40 ° C. and a relative humidity of 90% is preferably 1.0 g / m 2 ⁇ day or less, more preferably 0.5 g / m 2 ⁇ day or less. preferable. If the moisture permeability exceeds 1.0 g / m 2 ⁇ day, the humidification reliability of the transparent conductive layer 13 may deteriorate.
- the difference between the absolute value of the maximum heat shrinkage rate of the transparent conductive film 15 and the absolute value of the maximum heat shrinkage rate of the protective film 14 is preferably 0.05% to 0.6%, preferably 0.05% to 0%. 0.5% is more preferable, 0.05% to 0.4% is still more preferable, and 0.1% to 0.4% is most preferable. By doing so, the curl of the sheet of the transparent conductive film 10 with the protective film can be controlled within an appropriate range.
- the maximum heat shrinkage rate of the film substrate 11 and the protective film 14 may be negative (thermally expanded) depending on the material, stretching history, direction, and the like of the film substrate 11 and the protective film 14. Therefore, the absolute value of the maximum heat shrinkage rate is compared.
- the maximum heat shrinkage rate in the main surface of the transparent conductive film 15 is preferably equal to the absolute value of the maximum dimensional change rate in the main surface of the transparent conductive film 15.
- the transparent conductive film 15 may exhibit thermal contraction in a certain direction (for example, MD: Machine : Direction) and thermal expansion in another direction (for example, TD: Transverse Direction) in the main surface. That the maximum thermal shrinkage rate is equal to the absolute value of the maximum dimensional change rate means that the absolute value of the maximum thermal shrinkage rate is larger than the absolute value of the maximum thermal expansion rate.
- the transparent conductive film 15 has a maximum thermal contraction rate of 1.0% in MD and a maximum thermal expansion rate of 0.5% in TD in the main surface
- the maximum thermal contraction rate (1.0%) Is greater than the maximum coefficient of thermal expansion (0.5%), and the maximum thermal shrinkage is equal to the absolute value of the maximum dimensional change rate.
- the absolute value of the maximum thermal shrinkage rate is equal to the absolute value of the maximum dimensional change rate, which means that the thermal shrinkage rate is a positive value (not thermal expansion). Indicates heat shrinkage.
- the thermal shrinkage rate is a positive value (not thermal expansion).
- the maximum heat shrinkage rate in the main surface of the protective film 14 is preferably equal to the absolute value of the maximum dimensional change rate in the main surface of the protective film 14.
- the difference between the maximum heat shrinkage rate of the transparent conductive film 15 (substantially the maximum heat shrinkage rate of the film substrate 11) and the maximum heat shrinkage rate of the protective film 14 can be obtained by differentiating the respective formation conditions. For example, even when the film substrate 11 and the protective film 14 are made of the same polyethylene terephthalate (PET) and each has the same thickness, the maximum heat shrinkage can be varied if the respective stretching conditions are different.
- PET polyethylene terephthalate
- FIG. 3 is a schematic view of a first example of a conventional transparent conductive film 20 with a protective film.
- the wet optical adjustment layer 22 is formed on one main surface of the film substrate 21, and the transparent conductive layer 23 is formed on the wet optical adjustment layer 22.
- a laminate of the film substrate 21, the wet optical adjustment layer 22 and the transparent conductive layer 23 is referred to as a transparent conductive film 25.
- a protective film 24 is bonded to the main surface of the film base 21 opposite to the transparent conductive layer 23.
- the wet optical adjustment layer 22 is an optical adjustment layer formed by dissolving an organic resin material (for example, acrylic resin) in a solvent (for example, methyl isobutyl ketone) and coating (wet method) on the film substrate 21.
- an organic resin material for example, acrylic resin
- a solvent for example, methyl isobutyl ketone
- coating for example, a layer for adjusting the refractive index
- the heat shrinkage rate of the film base 21 and the heat shrinkage rate of the protective film 24 are designed to be substantially equal. Since the film substrate 21 and the protective film 24 have substantially the same heat shrinkage rate, curling of the sheet of the transparent conductive film 20 with the protective film hardly occurs depending on the temperature change.
- the moisture permeability of the wet optical adjustment layer 22 is very large. Therefore, the difference between the absorption rate of water absorbed into the film base 21 through the transparent conductive layer 23 and the wet optical adjustment layer 22 from the air and the absorption rate of water absorbed directly into the protective film 24 from the air is small.
- the film base material 21 and the protective film 24 both absorb water and expand, the difference between the water absorption speed of the film base material 21 and the water absorption speed of the protective film 24 is small. To do. Therefore, the curl of the sheet
- the sheet of the first example of the conventional transparent conductive film 20 with the protective film has a small curl due to temperature change and water absorption expansion, and the problem of curl does not occur.
- the first example of the conventional transparent conductive film 20 with a protective film has a problem of low scratch resistance.
- FIG. 4 shows a schematic diagram of a second example of a conventional transparent conductive film 30 with a protective film.
- the second example of the conventional transparent conductive film 30 with the protective film has a high scratch resistance.
- the adjustment layer 32 is used.
- the dry optical adjustment layer 32 is formed on one main surface of the film substrate 31, and the transparent conductive layer 33 is formed on the dry optical adjustment layer 32.
- a laminate of the film substrate 31, the dry optical adjustment layer 32, and the transparent conductive layer 33 is referred to as a transparent conductive film 35.
- a protective film 34 is bonded to the main surface of the film base 31 opposite to the transparent conductive layer 33.
- the dry optical adjustment layer 32 is, for example, a silicon dioxide (SiO 2 ) layer formed by a sputtering method (dry method).
- the heat shrinkage rate of the film base 31 and the heat shrinkage rate of the protective film 34 are designed to be substantially equal. Since the film substrate 31 and the protective film 34 have substantially the same heat shrinkage rate, curling of the sheet of the transparent conductive film 30 with the protective film hardly occurs depending on the temperature change.
- the moisture permeability of the dry optical adjustment layer 32 is approximately one digit or less smaller than the moisture permeability of the wet optical adjustment layer 22.
- the moisture permeability of the wet optical adjustment layer 22 is about 20 g / m 2 ⁇ day to 300 g / m 2 ⁇ day, whereas the moisture permeability of the dry optical adjustment layer 32 is 0.001 g / m 2 ⁇ day to It is about 1.0 g / m 2 ⁇ day.
- the transparent conductive layer 33 since the moisture permeability of the dry optical adjustment layer 32 is one digit or more smaller than the moisture permeability of the wet optical adjustment layer 22, the transparent conductive layer 33 from the air.
- the amount of water absorbed by the film base 31 through the dry optical adjustment layer 32 per unit time is considerably smaller than the amount of water absorbed directly by the protective film 34 from the air.
- the film base 31 absorbs water in the air also through the protective film 34, the timing at which the film base 31 absorbs water is later than that of the protective film 34.
- the dimension of the protection film 34 becomes larger than the dimension of the film substrate 31 as a result of the water absorption expansion. Therefore, a large curl is generated in the sheet of the transparent conductive film 30 with the protective film due to water absorption expansion.
- the sheet of the transparent conductive film 30 with a protective film having a large curl is extremely difficult to handle in a manufacturing process of a large touch panel device, for example, a heat crystallization process of a transparent conductive layer or a bonding process with another material.
- FIG. 2A is a schematic view of a sheet of the transparent conductive film 10 with a protective film in which the protective film 14 is bonded to the transparent conductive film 15. This bonding is performed at room temperature. At this time, the sheet of the transparent conductive film 10 with the protective film is hardly curled.
- FIG. 2B is a schematic diagram when the sheet of the transparent conductive film 10 with the protective film is heated.
- the transparent conductive film with a protective film 10 often undergoes a heating step in any of the steps.
- the touch panel device forms a wiring around the panel frame portion, and silver paste is often used as the wiring material.
- the silver paste contains a large amount of solvent and needs to be heated at a high temperature (for example, 140 ° C.) in order to solidify as a wiring.
- the transparent conductive film 10 with the protective film is made, for example, 140 in order to reduce the surface resistance value by crystallizing indium tin oxide. It is necessary to heat at °C. Although both the transparent conductive film 15 and the protective film 14 are thermally contracted by heating, the respective thermal contraction rates are different. Since the heat shrinkage rate of the transparent conductive film 15 is smaller than the heat shrinkage rate of the protective film 14, curling in the illustrated direction (direction of the protective film 14) occurs.
- ITO indium tin oxide
- FIG. 2 (c) shows the curl change when the sheet of the transparent conductive film 10 with the protective film after heating is left in the air at room temperature.
- the moisture permeability of the optical adjustment layer 12 is very small. Therefore, the absorption rate of water absorbed in the film base 11 through the transparent conductive layer 13 and the optical adjustment layer 12 from the air is considerably slower than the absorption rate of water directly absorbed in the protective film 14 from the air.
- the film base 11 absorbs water in the air also through the protective film 14, in that case, the timing at which the film base 11 absorbs water is later than that of the protective film 14.
- the protective film 14 has a higher water absorption rate than the film base 11, so that the protective film 14 absorbs water from the film base 11. It becomes larger than the water absorption expansion. For this reason, the curl of FIG. 2B caused by heat shrinkage is gradually corrected, and a substantially flat curl is small as shown in FIG.
- the moisture permeability of the optical adjustment layer 12 is 1.0 g / m 2 ⁇ day or less, and the absolute value of the maximum heat shrinkage (%) in the main surface of the transparent conductive film 15 is within the main surface of the protective film 14.
- the absolute value of the maximum heat shrinkage rate (%) is smaller than 0.05% to 0.6%, the difference in heat shrinkage rate between the transparent conductive film 15 and the protective film 14 and the transparent conductive film It was found that the difference in water absorption rate between the protective film 15 and the protective film 14 can be balanced.
- the optical adjustment layer 12 having a moisture permeability of 1.0 g / m 2 ⁇ day or less is preferably realized by a sputtering film.
- the optical adjustment layer 12 includes a region having a carbon atom content of 0.2 atomic% or less, and the absolute value of the maximum thermal shrinkage (%) in the main surface of the transparent conductive film 15 is When the absolute value of the maximum heat shrinkage rate (%) in the main surface is smaller than 0.05% to 0.6%, the difference in heat shrinkage rate between the transparent conductive film 15 and the protective film 14; It was found that the difference in water absorption rate between the transparent conductive film 15 and the protective film 14 can be balanced.
- the region where the carbon atom content is 0.2 atomic% or less is preferably realized by a sputtering film.
- the shape when measuring the curl of a sheet of transparent conductive film with a protective film is easy to clarify the measurement point of the curl and is almost square in the actual manufacturing process. Or it is preferable that it is a square or a rectangle from a viewpoint of handling with a rectangle, and it is more preferable that it is a square.
- the area of the sheet of protective film with the transparent conductive film is preferably at 600 cm 2 or more, more preferably 600 cm 2 or more 2500 cm 2 or less, still more preferably 620 cm 2 or more 2500 cm 2 or less, 1200cm is most preferably 2 or more 2500 cm 2 or less.
- the sheet of the transparent conductive film with a protective film at the time of curl measurement is, for example, an A4 rectangle (624 cm 2 ), a 35 cm square (1225 cm 2 ), and a 50 cm square (2500 cm 2 ).
- the sheet area is less than 600 cm 2 , it is difficult to confirm the presence or absence of curl at a level that causes a problem in the manufacturing process even if the curl test is performed.
- the sheet area exceeds 2500 cm 2 depending on the heating equipment, the sheet of the transparent conductive film with a protective film cannot be heated uniformly, and the curl value may vary greatly.
- the curl is measured by cutting out a sheet of a transparent conductive film with a protective film, heat-treating, and then placing the transparent conductive film on the upper side when the four vertices of the sheet curl to the transparent conductive film side.
- the protective film side it is performed with the protective film facing upward.
- the direction of curl at some vertices may be opposite to the direction of curl at the other vertices.
- the value of curl in the claims and the specification of the present application means the average value of the actual measured values of each curl measured at the four vertex positions of the transparent conductive film with a square or rectangular protective film unless otherwise specified.
- the measured value of curl is a positive value when the vertex of the sheet curls to the transparent conductive film side (FIG. 2D), and the case where the vertex of the sheet curls to the protective film side (FIG. 2B). )) Is a negative value.
- the absolute value of curl when a sheet of transparent conductive film with a protective film is heated at a temperature of 140 ° C. for 90 minutes and subsequently exposed to an environment at a temperature of 25 ° C. and a relative humidity of 55% for 1 minute to 4 hours is obtained throughout the entire exposure time.
- the maximum length of the transparent conductive film with a protective film is preferably 2.1% or less.
- the maximum length is about 70.7 cm of the diagonal line, and therefore the absolute value of curl is 15 mm or less (70.7 cm 2) throughout the entire exposure time. .1% or less).
- the absolute value of curl exceeds 2.1% of the maximum length of the transparent conductive film sheet with a protective film, it becomes difficult to handle the transparent conductive film sheet with a protective film, for example, when patterning and etching. There is a risk.
- the maximum length is a diagonal line.
- the maximum length is the length of the longest part of the delivery.
- a sheet of square or rectangular protective film with the transparent conductive film sheet area is 600 cm 2 or more 2500 cm 2 or less, and heated at 140 ° C. 90 minutes, subsequently the temperature 25 ° C., ⁇ 1 minute relative humidity of 55% for 4
- the absolute value of curl when exposed to time is preferably 15 mm or less throughout the entire exposure time. If the absolute value of curl is 15 mm or less, even in the manufacturing process of a large-sized touch panel device, a process defect derived from curl does not occur.
- the curl direction is preferably in a state of curling on the protective film side (curl is a negative value) as shown in FIG. 2 (b), for example. This is because it is convenient to adsorb the protective film side of the transparent conductive film with protective film to the vacuum suction stage when patterning and etching the sheet of transparent conductive film with protective film by photolithography or the like. It is.
- the present invention is not limited to the described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. is there.
- Table 1 shows Examples 1 to 4 and Comparative Examples 1 to 4 of the transparent conductive film with a protective film of the present invention.
- Each sample is a square sheet of 50 cm ⁇ 50 cm (sheet area: 2500 cm 2 ).
- Example 1 The film configuration of the transparent conductive film 40 with a protective film of Example 1 is shown in FIG. 5 (the same reference numerals as those in FIG. 1 denote the same parts).
- a hard coat layer 16 is formed on one main surface of the film substrate 11, an optical adjustment layer 12 is formed on the hard coat layer 16, and a transparent conductive layer 13 is formed on the optical adjustment layer 12.
- a laminate of the film substrate 11, the hard coat layer 16, the optical adjustment layer 12 and the transparent conductive layer 13 is referred to as a transparent conductive film 17.
- a protective film 14 is bonded to the main surface of the film base 11 opposite to the transparent conductive layer 13.
- the film substrate 11 is a polyethylene terephthalate (PET) film having a thickness of 100 ⁇ m
- the protective film 14 is a polyethylene terephthalate (PET) film having a thickness of 120 ⁇ m.
- the hard coat layer 16 is a layer having a thickness of 0.3 ⁇ m made of an ultraviolet curable resin containing zirconium oxide particles and an acrylic resin.
- the maximum heat shrinkage rate of the transparent conductive film 17 is substantially the maximum heat shrinkage rate of the film substrate 11.
- the film substrate 11 and the protective film 14 have different stretching conditions. The stretching conditions were adjusted so that the maximum heat shrinkage of the transparent conductive film 17 was 0.30% and the maximum heat shrinkage of the protective film 14 was 0.45%.
- ITO indium tin oxide
- Example 2 The transparent conductive film with a protective film of Example 2 is the same as Example 1 except that the maximum heat shrinkage of the transparent conductive film is 0.20% and the maximum heat shrinkage of the protective film is 0.51%. It was made.
- Example 3 The transparent conductive film with a protective film of Example 3 is the same as Example 1 except that the maximum heat shrinkage of the transparent conductive film is 0.22% and the maximum heat shrinkage of the protective film is 0.46%. It was made.
- Example 4 The transparent conductive film with a protective film of Example 4 was prepared in the same manner as in Example 3 except that the atmospheric pressure when forming the SiO 2 layer constituting the optical adjustment layer 12 was 0.3 Pa. By varying the pressure when forming the SiO 2 layer, density and moisture permeability of the SiO 2 layer can be adjusted.
- Comparative Example 1 The transparent conductive film with a protective film of Comparative Example 1 is the same as Example 1 except that the maximum heat shrinkage of the transparent conductive film is 0.43% and the maximum heat shrinkage of the protective film is 0.45%. It was made.
- Comparative Example 2 The transparent conductive film with protective film of Comparative Example 2 is the same as Example 1 except that the maximum heat shrinkage of the transparent conductive film is 0.51% and the maximum heat shrinkage of the protective film is 0.48%. It was made.
- FIG. 6 The film structure of the transparent conductive film 50 with a protective film of Comparative Example 3 is shown in FIG. 6 (the same reference numerals are given to the portions common to FIG. 3).
- a hard coat layer 26 is formed on one main surface of the film substrate 21, a wet optical adjustment layer 22 is formed on the hard coat layer 26, and a transparent conductive layer 23 is formed on the wet optical adjustment layer 22.
- a protective film 24 is bonded to the main surface of the film base 21 opposite to the transparent conductive layer 23.
- the film substrate 21 is a polyethylene terephthalate film having a thickness of 100 ⁇ m
- the protective film 24 is a polyethylene terephthalate film having a thickness of 120 ⁇ m.
- the maximum heat shrinkage rate of the transparent conductive film 27 (substantially the maximum heat shrinkage rate of the film substrate 21) is 0.46%, and the maximum heat shrinkage rate of the protective film 24 is approximately 0.45%.
- the wet optical adjustment layer 22 is formed by coating a thermosetting resin having a weight ratio of 2: 2: 1 of melamine resin: alkyd resin: organosilane condensate on the hard coat layer 26 with a thickness of 35 nm.
- the hard coat layer 26 and the transparent conductive layer 23 were produced in the same manner as in Example 1. After heating the transparent conductive layer 23 at 140 ° C. for 90 minutes, the crystalline specific resistance was 3.2 ⁇ 10 ⁇ 4 ⁇ ⁇ cm.
- Comparative Example 4 The transparent conductive film with a protective film of Comparative Example 4 was produced in the same manner as in Example 1 except that an 8 nm thick SiO 2 layer formed by electron beam evaporation was used as a dry optical adjustment layer.
- the moisture permeability of Examples 1 to 4 and Comparative Examples 1, 2, and 4 shown in Table 1 is dry optical adjustment in which only the transparent conductive layer is removed by etching in the transparent conductive film (without a protective film).
- the moisture permeability of Comparative Example 3 described in Table 1 is as follows: on a thin PET film (thickness: 23 ⁇ m) having a higher moisture permeability, the same material and application conditions as in Comparative Example 3, with a hard coat layer and thickness of 0.3 ⁇ m.
- the moisture permeability of a thin PET film with a wet optical adjustment layer produced by forming a 35 nm thick thermosetting resin at a temperature of 40 ° C. and a relative humidity of 90%.
- the reason why the moisture permeability of Examples 1 to 4 and Comparative Examples 1 and 2 is low is that the moisture permeability of the dry optical adjustment layer formed by sputtering under the conditions of Examples 1 to 4 and Comparative Examples 1 and 2 is low. .
- the reason why the moisture permeability of Comparative Example 3 is extremely high is that the moisture permeability of the wet optical adjustment layer (thermosetting resin layer having a thickness of 35 nm formed by a coating method) is extremely high.
- the reason why the moisture permeability of Comparative Example 4 is high is that the moisture permeability of the dry optical adjustment layer formed by the electron beam evaporation method is high.
- the maximum heat shrinkage rate described in Table 1 is the maximum heat shrinkage rate (%) in each main surface when the transparent conductive film and the protective film are heated at 140 ° C. for 90 minutes.
- the value of the maximum heat shrinkage rate is positive (heat shrinkage) in both the transparent conductive film and the protective film. It is equivalent to the absolute value of the maximum heat shrinkage rate in the example.
- the magnitude relationship between the maximum heat shrinkage rate (absolute value) of the transparent conductive film and the maximum heat shrinkage rate (absolute value) of the protective film and the difference thereof are important.
- the absolute value of the maximum heat shrinkage rate of the transparent conductive film is smaller than the absolute value of the maximum heat shrinkage rate of the protective film, and the difference needs to be 0.05% to 0.6%. Examples 1 to 4 satisfy this condition.
- the curl values shown in Table 1 are as follows: a sheet of a transparent conductive film with a protective film is heated in a heat treatment furnace at 140 ° C. for 90 minutes and immediately after being removed from the heat treatment furnace, room temperature (temperature 25 ° C., relative humidity 55%) The measurements were taken when left in an atmosphere for 30 minutes, left for 1 hour at room temperature, and left for 4 hours at room temperature. In each of Examples 1 to 4 and Comparative Example 4, the curl value is negative. In each of Comparative Examples 1 to 3, the curl value is positive. Immediately after taking out from the heat treatment furnace, neither the transparent conductive film nor the protective film has absorbed water in the air yet.
- the curl value is negative for all measurement times, and the absolute value of curl is the largest immediately after heating (immediately after removal from the heat treatment furnace) and decreases with time.
- the magnitude of the absolute value of curl is 15 mm (2.1% of the maximum length of the sample (diagonal line)) or less during the entire exposure time from immediately after heating to 4 hours later.
- the curl value is positive at all measurement times, and the curl absolute value is the smallest immediately after heating and increases with time.
- the transparent conductive film has a smaller maximum heat shrinkage rate than the protective film, but the difference is too small (less than 0.05%), so the water absorption expansion of the protective film is canceled by the difference in the maximum heat shrinkage rate. I can't. Therefore, the curl tends to increase with time.
- the curl is 15 mm or less immediately after heating, but exceeds 15 mm (2.1% of the maximum length (diagonal line) of the sample) after 1 hour and after 4 hours.
- Comparative Example 2 since the transparent conductive film has a larger maximum heat shrinkage rate than the protective film, the water absorption expansion of the protective film is further expanded due to the difference in the maximum heat shrinkage rate. Therefore, the curl tends to increase with time. Naturally, the curl size of Comparative Example 2 is larger than Comparative Example 1.
- Comparative Example 3 is a reference example because a wet optical adjustment layer is used, but is designed so that there is almost no difference in maximum heat shrinkage between the transparent conductive film and the protective film. Since the wet optical adjustment layer has an order of magnitude higher moisture permeability than the dry optical adjustment layer, the difference in water absorption between the transparent conductive film and the protective film is small. As a result, the size of the curl is small and hardly changes even if the water absorption and expansion proceeds with time.
- Comparative Example 4 the curl value is negative at all measurement times, and the absolute value of the curl hardly changes over time.
- the dry optical adjustment layer of Comparative Example 4 has an extremely large moisture permeability as compared with the dry optical adjustment layers of Examples 1 to 4 and Comparative Examples 1 and 2. Therefore, as in Comparative Example 3, the difference in water absorption between the transparent conductive film and the protective film is small. As a result, the curl change is small even if the water absorption expansion proceeds with time.
- the transparent conductive film with protective film of Example 1 and Comparative Example 1 was cut into 10 cm ⁇ 10 cm, and the curl was evaluated in the same manner as in Examples 1 to 4 and Comparative Examples 1 to 4.
- the absolute value of curl in Example 1 was the largest immediately after heating (the curl value was ⁇ 4 mm), and the absolute value of curl in Comparative Example 1 was the largest after 4 hours (the curl value was 8 mm). . That is, in both the examples and comparative examples, the absolute value of the curl value was at a low level (15 mm or less).
- a dry optical adjustment layer a silicon oxide layer having a thickness of 20 nm formed by sputtering
- the optical adjustment layer 12 (a silicon oxide layer having a thickness of 20 nm formed by a sputtering method) has a region having carbon atoms of 0.2 atomic% or less in thickness. It was confirmed by X-ray photoelectron spectroscopy that there was at least 50% in the direction.
- Wet optical adjustment layer 22 in Comparative Example 3 thermosetting resin layer having a thickness of 35 nm formed by a coating method
- optical adjustment layer 12 in Comparative Example 4 having a thickness of 8 nm formed by an electron beam evaporation method. It was confirmed by X-ray photoelectron spectroscopy that the second layer) does not have a region having carbon atoms of 0.2 atomic% or less.
- the curl is measured by heating a square sheet (50 cm ⁇ 50 cm) cut from a transparent conductive film with a protective film at 140 ° C. for 90 minutes, and then placing it on a surface plate to measure the height of the four corners of the square (actual measured value of curl) Was measured, and the average value of the actual measurements was calculated as the curl value.
- the moisture permeability of the wet optical adjustment layer is higher than that of a 100 ⁇ m thick polyethylene terephthalate film (PET) substrate (moisture permeability of 6 g / m 2 ⁇ day).
- PET polyethylene terephthalate film
- the value becomes the value of the moisture permeability of the polyethylene terephthalate film substrate, and the moisture permeability of the wet optical adjustment layer cannot be measured.
- a polyethylene terephthalate substrate having a thickness of 100 ⁇ m is used to confirm the level of moisture permeability of the wet optical adjustment layer with respect to the silicon oxide layer and the film substrate of the present example.
- a thin polyethylene terephthalate film (thickness: 23 ⁇ m, moisture permeability: 25 g / m 2 ⁇ day) having higher moisture permeability was prepared.
- a hard coat layer having a thickness of 0.3 ⁇ m and a wet optical adjustment layer having a thickness of 35 nm are formed under the same materials and application conditions as those in Comparative Example 3, and a thin PET film with a wet optical adjustment layer is formed.
- the moisture permeability was evaluated in the same manner as in Examples 1 to 3 and Comparative Examples 1 and 2.
- the moisture permeability of the thin optical film with a wet optical adjustment layer was 25 g / m 2 ⁇ day, and the moisture permeability of the wet optical adjustment layer was found to be higher than that of the thin polyethylene terephthalate film. For this reason, the moisture permeability of the accurate wet optical adjustment layer could not be measured, but since the numerical value was found to be 25 g / m 2 ⁇ day or more, it was set to 25 g / m 2 ⁇ day or more.
- Comparative Example 4 similarly to Comparative Example 3, the moisture permeability of the dry optical adjustment layer is equivalent to the moisture permeability of the film substrate 11 (100 ⁇ m PET substrate) (moisture permeability of 6 g / m 2 ⁇ day). It was not possible to measure the moisture permeability. Therefore, the moisture permeability of the dry optical adjustment layer of Comparative Example 4 was set to 6 g / m 2 ⁇ day or more.
- a PET base material with a vacuum deposition film was prepared by laminating a SiO 2 film having a dry optical adjustment layer thickness of 30 nm of Comparative Example 4 on a film base material 11 (100 ⁇ m PET base material). Humidity was measured. As a result, even if the thickness of the dry optical adjustment layer is 30 nm, which is 1.5 times the thickness of Examples 1 to 4, the moisture permeability of the dry optical adjustment layer is equivalent to the moisture permeability of a PET substrate of 100 ⁇ m (permeability). The humidity was 6 g / m 2 ⁇ day). From this, it can be seen that the dry optical adjustment layer provided in Comparative Example 4 has a significantly higher moisture permeability than the dry optical adjustment layers comprising the sputtering films shown in Examples 1 to 4 and Comparative Examples 1 and 2.
- the existence region in the thickness direction of the impurity atoms (carbon atoms) in the optical adjustment layer is expressed by the formula ( 1) based on the thickness T 1 of the SiO 2 layer measured by the depth profile and the thickness T 2 of the region where the carbon atoms are detected.
- T 2 / T 1 ) X100 (%) and based on this, the region where the carbon atom is 0.2 atomic% or less is calculated by the formula “100- (T 2 / T 1 ) X100” (%) did.
- FIG. 7 is a depth profile of the four elements measured every 1 nm in terms of SiO 2 .
- the horizontal axis indicates the thickness direction (nm), and the vertical axis indicates the element ratio (atomic%).
- the left end is the transparent conductive layer side (surface side), and the right end is the hard coat layer side.
- ESCA has a shape in which the depth profile has a base due to the nature of the analysis, but the film thickness T 1 of SiO 2 is a position which is halved on the surface side and the film substrate side with respect to the maximum value of the Si element ratio, respectively. the outermost portion of the SiO 2 layer, and the deepest were therebetween thickness as the thickness T 1 of the SiO 2 layer.
- the thickness T 2 of the region where C atoms were detected as impurity atoms was calculated, and the presence region (T 2 / T 1 ) X100 (%) of the impurity atoms was determined. .
- a transparent conductive film with a protective film heated at 140 ° C. for 90 minutes was cut out in a 5 cm ⁇ 11 cm rectangle, and a silver paste was applied to the 5 mm portions at both ends on the long side, followed by natural drying for 48 hours.
- the protective film of the transparent conductive film with a protective film was peeled off, and the side of the transparent conductive film opposite to the transparent conductive layer was affixed to a glass plate with an adhesive to obtain a sample for evaluating scratch resistance.
- a ten-point pen tester manufactured by MTM
- the center position (2.5 cm position) on the short side of the sample for scratch resistance evaluation is 10 cm in the long side direction under the following conditions.
- the surface of the transparent conductive layer of the sample for scratch resistance evaluation was rubbed with the length.
- the resistance value (R0) of the sample for scuffing evaluation before rubbing and the resistance value (R20) of the sample for scuffing evaluation after rubbing are set to the central position (5.5 cm) on the long side of the sample for scuffing evaluation. Position), the scratch resistance was evaluated by applying a tester to the silver paste portions at both ends and determining the resistance change rate (R20 / R0). The case where the resistance change rate was 1.5 or less was evaluated as “ ⁇ ”, and the case where the resistance change rate exceeded 1.5 was evaluated as “X”.
- Abrasion child Anticon Gold (manufactured by Contec) ⁇ Load: 127g / cm2 ⁇ Abrasion speed: 13 cm / sec (7.8 m / min) -Number of scratches: 20 times (10 round trips)
- the thicknesses of the film substrate and the protective film were measured using a film thickness meter (manufactured by Peacock (registered trademark), device name “Digital Dial Gauge DG-205”).
- the thicknesses of the hard coat layer, the optical adjustment layer, and the transparent conductive layer were measured by observing a cross section with a transmission electron microscope (manufactured by Hitachi, Ltd., device name “H-7650”).
- the transparent conductive film with a protective film of this invention is used especially suitably for a touch panel.
Landscapes
- Laminated Bodies (AREA)
- Non-Insulated Conductors (AREA)
Abstract
Description
図1に本発明の保護フィルム付き透明導電性フィルム10の1例の模式図を示す。図1の保護フィルム付き透明導電性フィルム10では、フィルム基材11の一方の主面に光学調整層12が形成され、光学調整層12の上に透明導電層13が形成されている。フィルム基材11の透明導電層13と反対側の主面には保護フィルム14が、例えば図示しない粘着剤により、貼り合わされている。フィルム基材11と光学調整層12と透明導電層13の積層体を透明導電性フィルム15という。透明導電性フィルム15および保護フィルム14は、通常、樹脂フィルムにより構成される。樹脂フィルムは、加熱により寸法変化しやすく、一般に主面内の少なくとも一方向で熱収縮しやすい。よって、透明導電性フィルム15および保護フィルム14は、主面内の少なくとも一方向で熱収縮しやすい。透明導電性フィルム15の最大熱収縮率の絶対値は、保護フィルム14の最大熱収縮率の絶対値より小さい。なお透明導電性フィルム15の熱収縮率は圧倒的に厚さが厚いフィルム基材11の熱収縮率が支配的である。
フィルム基材11は、例えば、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリオレフィン、ポリシクロオレフィン、ポリカーボネート、ポリエーテルスルフォン、ポリアリレート、ポリイミド、ポリアミド、ポリスチレン、ノルボルネンなどからなる。フィルム基材11の材質はこれらに限定されることはないが、透明性、耐熱性、および機械特性に優れるポリエチレンテレフタレートが、特に好ましい。
透明導電層13は、金属の導電性酸化物を主成分とする薄膜層、または主金属と1種以上の不純物金属を含有する複合金属酸化物を主成分とする透明薄膜層である。透明導電層13は、可視光域で光透過性を有し、かつ、導電性を有するものであれば、その構成材料は特に限定されることはない。
保護フィルム14は、例えば、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリオレフィン、ポリシクロオレフィン、ポリカーボネート、ポリエーテルスルフォン、ポリアリレート、ポリイミド、ポリアミド、ポリスチレン、ノルボルネン等からなる。保護フィルム14の材質がこれらに限定されることはないが、透明性、耐熱性、および機械特性に優れるポリエチレンテレフタレートが、特に好ましい。
光学調整層12は、フィルム基材11と透明導電層13との間に設けられる屈折率調整のための層であり、この層の存在により透明導電性フィルム15の光学特性(例えば、反射特性)を最適化することができる。光学調整層12は、乾式成膜法により、フィルム基材11上に成膜される乾式光学調整層であり、その組成は無機酸化物を含み、好ましくは、無機酸化物から成る。光学調整層12の形成方法は、十分な耐擦傷性が得られる乾式成膜法であれば限定はされないが、特にスパッタリング法が好ましい。スパッタリング法で形成した膜は、他の乾式成膜法(例えば、真空蒸着法)と比して、特に緻密な膜を安定して得ることができるため、スパッタリング法で形成した無機酸化物層を含む光学調整層12は優れた耐擦傷性を有する。
透明導電性フィルム15の、温度40℃、相対湿度90%での透湿度は、1.0g/m2・day以下であることが好ましく、0.5g/m2・day以下であることがより好ましい。透湿度が1.0g/m2・dayを超えると、透明導電層13の耐加湿信頼性が悪化する場合がある。
透明導電性フィルム15の最大熱収縮率の絶対値と、保護フィルム14の最大熱収縮率の絶対値の差は0.05%~0.6%であることが好ましく、0.05%~0.5%であることがより好ましく、0.05%~0.4%であることが更に好ましく、0.1%~0.4%であることが最も好ましい。そのようにすることにより、保護フィルム付き透明導電性フィルム10のシートのカールを適切な範囲に制御できる。フィルム基材11および保護フィルム14の最大熱収縮率は、フィルム基材11および保護フィルム14の材料、延伸履歴、方向などにより、マイナスになる(熱膨張する)ことがある。そのため最大熱収縮率の絶対値で比較することとする。
図2により、本発明の保護フィルム付き透明導電性フィルム10のシートのカールを抑制するメカニズムを説明する(図2の符号は図1と共通である)。なお図2においては、透明導電性フィルム15および保護フィルム14がいずれも熱収縮する(熱収縮率がプラス)場合について説明する。図2(a)は透明導電性フィルム15に保護フィルム14が貼り合わされた保護フィルム付き透明導電性フィルム10のシートの模式図である。この貼り合わせは常温で行なわれる。この時点では保護フィルム付き透明導電性フィルム10のシートにカールはほとんどない。
表1に本発明の保護フィルム付き透明導電性フィルムの実施例1~4と比較例1~4を示す。各サンプルは50cmX50cm(シート面積:2500cm2)の正方形のシートである。
実施例1の保護フィルム付き透明導電性フィルム40の膜構成を図5に示す(図1と共通部分は同じ符号を付す)。フィルム基材11の一主面上にハードコート層16が形成され、ハードコート層16上に光学調整層12が形成され、光学調整層12上に透明導電層13が形成されている。フィルム基材11、ハードコート層16、光学調整層12および透明導電層13の積層体を透明導電性フィルム17という。フィルム基材11の、透明導電層13と反対側の主面に保護フィルム14が貼り合わされている。フィルム基材11は厚さ100μmのポリエチレンテレフタレート(PET)フィルム、保護フィルム14は厚さ120μmのポリエチレンテレフタレート(PET)フィルムである。ハードコート層16は、酸化ジルコニウム粒子とアクリル樹脂を含む紫外線硬化性樹脂からなる、厚み0.3μmの層である。透明導電性フィルム17の最大熱収縮率は、実質的にはフィルム基材11の最大熱収縮率である。フィルム基材11と保護フィルム14は延伸条件が異なる。延伸条件を調整して、透明導電性フィルム17の最大熱収縮率は0.30%、保護フィルム14の最大熱収縮率は0.45%となるようにした。
実施例2の保護フィルム付き透明導電性フィルムは、透明導電性フィルムの最大熱収縮率を0.20%、保護フィルムの最大熱収縮率を0.51%とした以外は、実施例1と同様にして作製した。
実施例3の保護フィルム付き透明導電性フィルムは、透明導電性フィルムの最大熱収縮率を0.22%、保護フィルムの最大熱収縮率を0.46%とした以外は、実施例1と同様にして作製した。
実施例4の保護フィルム付き透明導電性フィルムは、光学調整層12を構成するSiO2層の成膜する際の気圧を0.3Paとした以外は、実施例3と同様にして作成した。SiO2層の成膜する際の気圧を変えることにより、SiO2層の密度および透湿度が調整できる。
比較例1の保護フィルム付き透明導電性フィルムは、透明導電性フィルムの最大熱収縮率を0.43%、保護フィルムの最大熱収縮率を0.45%とした以外は、実施例1と同様にして作製した。
比較例2の保護フィルム付き透明導電性フィルムは、透明導電性フィルムの最大熱収縮率を0.51%、保護フィルムの最大熱収縮率を0.48%とした以外は、実施例1と同様にして作製した。
比較例3の保護フィルム付き透明導電性フィルム50の膜構成を図6に示す(図3と共通の部分には同じ符号を付す)。フィルム基材21の一主面上にハードコート層26が形成され、ハードコート層26上に湿式光学調整層22が形成され、湿式光学調整層22上に透明導電層23が形成されている。フィルム基材21の、透明導電層23と反対側の主面に保護フィルム24が貼り合わされている。フィルム基材21は厚さ100μmのポリエチレンテレフタレートフィルム、保護フィルム24は厚さ120μmのポリエチレンテレフタレートフィルムである。透明導電性フィルム27の最大熱収縮率(実質的にはフィルム基材21の最大熱収縮率)は0.46%、保護フィルム24の最大熱収縮率は0.45%で略等しい。湿式光学調整層22は、メラミン樹脂:アルキド樹脂:有機シラン縮合物の重量比2:2:1の熱硬化樹脂を、厚さ35nmでハードコート層26上に塗工形成したものである。ハードコート層26と透明導電層23は、実施例1と同様にして作製した。透明導電層23を140℃、90分間加熱した後の結晶質の比抵抗は3.2X10-4Ω・cmであった。
比較例4の保護フィルム付き透明導電性フィルムは、電子ビーム蒸着法により形成した厚み8nmのSiO2層を乾式光学調整層とした形成した以外は、実施例1と同様にして作製した。
表1に記載した実施例1~4および比較例1、2、4の透湿度は、透明導電性フィルム(保護フィルムは備えていない)において、透明導電層のみをエッチングにより除去した、乾式光学調整層付きフィルムの、温度40℃、相対湿度90%での透湿度である。表1に記載した比較例3の透湿度は、より透湿度が高い薄型PETフィルム(厚み23μm)上に、比較例3と同一の材料及び塗布条件で、厚み0.3μmのハードコート層及び厚さ35nmの熱硬化樹脂を形成して作製した湿式光学調整層付薄型PETフィルムの、温度40℃、相対湿度90%での透湿度である。
表1に記載した最大熱収縮率は、透明導電性フィルムおよび保護フィルムを140℃、90分加熱したときの、それぞれの主面内での最大熱収縮率(%)である。実施例1~4、比較例1~4においては、透明導電性フィルムおよび保護フィルムのいずれも最大熱収縮率の値がプラスである(熱収縮している)ため、表1の数値は、各例の最大熱収縮率の絶対値と同値である。本発明では、透明導電性フィルムの最大熱収縮率(絶対値)と保護フィルムの最大熱収縮率(絶対値)の大小関係とその差の大きさが重要である。透明導電性フィルムの最大熱収縮率の絶対値は保護フィルムの最大熱収縮率の絶対値より小さく、その差は0.05%~0.6%の必要がある。実施例1~4はこの条件を満たす。
表1に記載したカールの値は、保護フィルム付き透明導電性フィルムのシートを熱処理炉内で140℃、90分加熱し、熱処理炉から出した直後、室温(温度25℃、相対湿度55%)雰囲気中で30分放置した時点、室温で1時間放置した時点、室温で4時間放置した時点で、それぞれ測定したものである。実施例1~4及び比較例4は、いずれもカールの値がマイナスである。比較例1~3は、いずれもカールの値がプラスである。熱処理炉から出した直後は、透明導電性フィルムおよび保護フィルムのどちらもまだ空気中の水分を吸水していない。
実施例1~4および比較例1、2は、透湿度が十分に低く、膜密度が高い乾式光学調整層(スパッタリング法で形成された厚さ20nmのケイ素酸化物層)を備えているため、擦傷性試験を実施した後であっても、抵抗値の変化が小さく(R20/R0=1.1以下)、耐擦傷性は良好であった。
実施例1~4および比較例1、2における、光学調整層12(スパッタリング法で形成された厚さ20nmのケイ素酸化物層)には、炭素原子が0.2atomic%以下の領域が、厚さ方向に少なくとも50%以上あることをX線光電子分光法にて確認した。比較例3における、湿式光学調整層22(塗工法で形成された厚さ35nmの熱硬化樹脂層)及び比較例4における、光学調整層12(電子ビーム蒸着法で形成された厚さ8nmのSiO2層)には、炭素原子が0.2atomic%以下の領域がないことをX線光電子分光法にて確認した。
[最大熱収縮率]
まず、保護フィルム付き透明導電性フィルムを、透明導電性フィルムと保護フィルム(粘着層付き)とに分離した。次に、透明導電性フィルム及び保護フィルムのそれぞれについて、流れ方向(MD : Machine Direction)に10cm(L1)、その直交方向(垂直方向(TD : Transverse Direction))に10cmの正方形にサンプリングし、これを140℃、90分の条件で加熱した。加熱後の最大熱収縮方向(実施例1~4、比較例1~4ではMD方向)のサンプル長さ(L2)を測定し、「最大熱収縮率(%)={(L1-L2)/L1}X100」という式に従って最大熱収縮率を算出した。
カールの測定は、保護フィルム付き透明導電性フィルムから切り出した正方形のシート(50cmX50cm)を、140℃、90分加熱した後、定盤に載せ、正方形の四頂点の高さ(カールの実測値)を測定し、それらの実測値の平均値を算出してカールの値とした。
実施例1~4、比較例1、2、4では、透明導電性フィルム(保護フィルムは備えていない)の非晶質透明導電層(加熱処理前の透明導電層)を、20℃の塩酸(濃度:10重量%)に2分間浸漬することでエッチング除去し、光学調整層付きフィルム基材とした(ハードコート層も含まれている)。その後、通称モコン法によって、光学調整層付きフィルム基材の透湿度を測定し、その測定値を光学調整層の透湿度とした。具体的には、試験装置「PERMATRAN W3/33(MOCON社製)」を用いて、JIS K7129:2008に準じ、40℃、相対湿度90%の雰囲気下で、透湿度測定を実施した。
光学調整層内の不純物原子(炭素原子)の厚さ方向の存在領域の評価は、測定装置Quantum2000(アルバック・ファイ社製)を用いて、X線光電子分光法(通称ESCA法)により行った。具体的には、保護フィルム付き透明導電性フィルムの、透明導電層の側からフィルム基材方向に向かって、Arイオンでエッチングしながら、In、Si、O、C原子に関するデプスプロファイル測定を行い、SiO2換算で1nmごとの、前記4元素の元素比率(atomic%)を算出した。光学調整層内の不純物原子(炭素原子)の厚さ方向の存在領域は、デプスプロファイルで測定したSiO2層の膜厚T1と、炭素原子が検出された領域の厚みT2より、式(T2/T1)X100(%)で求め、これをもとにして、炭素原子が0.2atomic%以下の領域を、式「100-(T2/T1)X100」(%)により算出した。
140℃、90分間加熱した保護フィルム付き透明導電性フィルムを5cmX11cmの長方形で切り出し、長辺側の両端部5mm部分に銀ペーストを塗着して、48時間自然乾燥させた。次に、保護フィルム付き透明導電性フィルムの保護フィルムを剥がし、透明導電性フィルムの、透明導電層とは反対の側を、粘着剤付ガラス板に貼付し、擦傷性評価用サンプルを得た。10連式ペン試験機(エム・ティー・エム社製)を用いて、擦傷性評価用サンプルの短辺側における中央位置(2.5cm位置)で、下記条件にて、長辺方向に10cmの長さで擦傷性評価用サンプルの透明導電層表面を擦った。擦る前の擦傷性評価用サンプルの抵抗値(R0)と、擦った後の擦傷性評価用サンプルの抵抗値(R20)とを、擦傷性評価用サンプルの長辺側における中央位置(5.5cm位置)で、両端部の銀ペースト部にテスターをあてることで測定し、抵抗変化率(R20/R0)を求めることで耐擦傷性を評価した。抵抗変化率が1.5以下であった場合を「○」、1.5を超えた場合を「X」として評価した。
・擦傷子:アンティコンゴールド(コンテック社製)
・荷重:127g/cm2
・擦傷速度:13cm/秒(7.8m/分)
・擦傷回数:20回(往復10回)
フィルム基材及び保護フィルムの厚みは、膜厚計(尾崎製作所(Peacock(登録商標))社製、装置名「デジタルダイアルゲージ DG-205」)を用いて測定した。また、ハードコート層、光学調整層、透明導電層の厚みは、透過型電子顕微鏡(日立製作所製、装置名「H-7650」)により断面観察して測定した。
Claims (10)
- フィルム基材の一方の主面に、少なくとも光学調整層と透明導電層をこの順に備えた積層体からなる透明導電性フィルムと、
前記フィルム基材の、前記透明導電層とは反対側の主面に貼り合わされた保護フィルムとを備えた保護フィルム付き透明導電性フィルムであって、
前記光学調整層はスパッタリング膜を含み、
前記透明導電性フィルムおよび前記保護フィルムは、主面内の少なくとも一方向で熱収縮する特性を有し、
前記透明導電性フィルムの主面内の最大熱収縮率(%)の絶対値が、前記保護フィルムの主面内の最大熱収縮率(%)の絶対値より小さく、その差が0.05%~0.6%である保護フィルム付き透明導電性フィルム。 - フィルム基材の一方の主面に、少なくとも光学調整層と透明導電層をこの順に備えた積層体からなる透明導電性フィルムと、
前記フィルム基材の、前記透明導電層とは反対側の主面に貼り合わされた保護フィルムとを備えた保護フィルム付き透明導電性フィルムであって、
前記光学調整層は、厚さ方向において、炭素原子の含有量が0.2atomic%以下の領域を含み、
前記透明導電性フィルムおよび前記保護フィルムは、主面内の少なくとも一方向で熱収縮する特性を有し、
前記透明導電性フィルムの主面内の最大熱収縮率(%)の絶対値が、前記保護フィルムの主面内の最大熱収縮率(%)の絶対値より小さく、その差が0.05%~0.6%である保護フィルム付き透明導電性フィルム。 - フィルム基材の一方の主面に、少なくとも光学調整層と透明導電層をこの順に備えた積層体からなる透明導電性フィルムと、
前記フィルム基材の、前記透明導電層とは反対側の主面に貼り合わされた保護フィルムとを備えた保護フィルム付き透明導電性フィルムであって、
前記光学調整層の透湿度は1.0g/m2・day以下であり、
前記透明導電性フィルムおよび前記保護フィルムは、主面内の少なくとも一方向で熱収縮する特性を有し、
前記透明導電性フィルムの主面内の最大熱収縮率(%)の絶対値が、前記保護フィルムの主面内の最大熱収縮率(%)の絶対値より小さく、その差が0.05%~0.6%である保護フィルム付き透明導電性フィルム。 - 正方形あるいは長方形のシートに切り出された状態で、前記シートが温度140℃で90分間加熱され、引き続き温度25℃、相対湿度55%の環境に1分間~4時間暴露されたときに生じるカールの絶対値が、全暴露時間を通して、前記シートの対角線長の2.1%以下である請求項1~3のいずれかに記載の保護フィルム付き透明導電性フィルム。
- 面積が600cm2以上の、正方形あるいは長方形のシートに切り出された状態で、前記シートが140℃で90分間加熱され、引き続き温度25℃、相対湿度55%の環境に1分間~4時間暴露されたときに生じるカールの絶対値が、全暴露時間を通して、15mm以下である、請求項1~3のいずれかに記載の保護フィルム付き透明導電性フィルム。
- 前記保護フィルムと前記フィルム基材の層間密着力が、全ての各層間の層間密着力の中で最小である請求項1~5のいずれかに記載の保護フィルム付き透明導電性フィルム。
- 前記透明導電性フィルムの、温度40℃、相対湿度90%での透湿度が、1.0g/m2・day以下である請求項1~6のいずれかに記載の保護フィルム付き透明導電性フィルム。
- 正方形あるいは長方形のシートに切り出された状態で、前記シートが140℃で90分間加熱され、引き続き温度25℃、相対湿度55%の環境に1分間~4時間暴露されたときに生じるカールの実測値について、前記透明導電性フィルム側へのカールの実測値をプラス値とし、前記保護フィルム側へのカールの実測値をマイナス値としたとき、全暴露時間を通して、前記シートの四頂点における前記カールの実測値の平均値がマイナス値となる、請求項1~7のいずれかに記載の保護フィルム付き透明導電性フィルム。
- 正方形あるいは長方形のシートに切り出された状態で、前記シートが温度140℃で90分間加熱され、引き続き温度25℃、相対湿度55%の環境に1分間~4時間暴露されたときに生じる前記シートの四頂点におけるカールの方向が、全暴露時間を通して、前記保護フィルム側へのカールである請求項1~8のいずれかに記載の保護フィルム付き透明導電性フィルム。
- フィルム基材及び保護フィルムがいずれもポリエチレンテレフタレートからなり、いずれもMD(Machine Direction)方向の熱収縮率が最大熱収縮率である、請求項1~9のいずれかに記載の保護フィルム付き透明導電性フィルム。
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US15/117,545 US10183466B2 (en) | 2014-11-20 | 2015-11-10 | Transparent electroconductive film with protective film |
CN201580003048.0A CN105814646B (zh) | 2014-11-20 | 2015-11-10 | 带保护薄膜的透明导电性薄膜 |
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JP2021059053A (ja) * | 2019-10-07 | 2021-04-15 | 日東電工株式会社 | 印刷層付フィルム積層体の製造方法 |
WO2021070424A1 (ja) * | 2019-10-07 | 2021-04-15 | 日東電工株式会社 | 印刷層付フィルム積層体、該印刷層付フィルム積層体を含む光学積層体、およびこれらを用いた画像表示装置 |
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JP2014209440A (ja) * | 2013-03-25 | 2014-11-06 | 積水ナノコートテクノロジー株式会社 | 積層フィルム及びそのフィルムロール、並びにそれから得られうる光透過性導電性フィルム及びそれを利用したタッチパネル |
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JP2021059053A (ja) * | 2019-10-07 | 2021-04-15 | 日東電工株式会社 | 印刷層付フィルム積層体の製造方法 |
WO2021070424A1 (ja) * | 2019-10-07 | 2021-04-15 | 日東電工株式会社 | 印刷層付フィルム積層体、該印刷層付フィルム積層体を含む光学積層体、およびこれらを用いた画像表示装置 |
JP2021059052A (ja) * | 2019-10-07 | 2021-04-15 | 日東電工株式会社 | 印刷層付フィルム積層体、該印刷層付フィルム積層体を含む光学積層体、およびこれらを用いた画像表示装置 |
WO2021070425A1 (ja) * | 2019-10-07 | 2021-04-15 | 日東電工株式会社 | 印刷層付フィルム積層体の製造方法 |
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