JP6957885B2 - Films and laminated sheets for organic electroluminescence display devices - Google Patents

Description

The present invention relates to a film and a laminated sheet for an organic electroluminescence display device, and can be particularly preferably used as a cover film for an organic electroluminescence display device by controlling bending hysteresis 2HB in a bending test within a specific range. It relates to a possible film and laminated sheet.

In recent years, an image display device (hereinafter, referred to as "organic electroluminescence display device") using a self-luminous body called an organic light emitting diode has been put into practical use. Compared to conventional liquid crystal displays, this organic electroluminescence display device uses a self-luminous body, so it is not only superior in terms of visibility and response speed, but also an auxiliary lighting device such as a backlight. Therefore, it is possible to make the display device thinner and more flexible. For this reason, the development of flexible display devices that can be folded and rolled is accelerating, and bending resistance is also required for cover films that prevent scratches on the surface of display devices.

For example, as a method for improving scratch resistance for an image display device, a hard coat film in which a hard coat layer is laminated on both sides of a base material containing a polyester film has been proposed (for example, Patent Document 1). Further, for a flexible display device, an antireflection film in which an antireflection layer is provided on at least one surface of a transparent resin film having flexibility including a polyester film has been proposed (for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2015-61750 Japanese Unexamined Patent Publication No. 2016-75869

However, the films used for the image display devices described in Patent Documents 1 and 2 are characterized by a hard coat layer and an antireflection layer, and the film as a base material does not consider bending resistance. , It was difficult to apply it to organic electroluminescence display devices. Further, if the bending resistance of the film is improved, a new problem may occur in which the flatness of the film when a curable resin layer such as a hard coat layer is applied to the film as a scratch resistant layer deteriorates. all right.

Therefore, an object of the present invention is to solve the above-mentioned problems, and when it is applied to an organic electroluminescence display device, it has good bending resistance and a good flat surface when a curable resin such as a hard coat layer is provided. The purpose is to provide a film that can achieve both properties.

The present invention employs the following means in order to solve such a problem.
(1) longitudinal direction and the width direction of the bending the bending hysteresis 2HB obtained from the test are both 0.01gf · cm / cm or more 0.04gf · cm / cm der less is, the film any longitudinal 10 cm × width 20cm range The variation of the orientation angle in is within 5 °.
(2) The b value obtained from the spectrocolorimeter is 2.0 or less, and the total light transmittance is 90% or more.
(3) The flexural rigidity in the longitudinal direction and the width direction obtained from the bending test using a bending tester (Kato Tech (KES-FB2)) is ^{0.01 gf · cm 2} / cm or more and 0.1 gf · cm. ^{Must be 2} / cm or less.
( 4 ) At least in the range where the heat shrinkage rate at 150 ° C. in the width direction is 1% or less and the heat shrinkage rate at 150 ° C. in the longitudinal direction is -2% or more and 2% or less with respect to the heat shrinkage rate at 150 ° C. in the width direction. There is.
( 5 ) Polyester should be the main constituent.
( 6 ) The refractive index in the thickness direction is 1.5 or more.
( 7 ) A laminated sheet having a layer containing a curable resin on at least one side of the film according to any one of (1) to ( 6).

According to the present invention, it is possible to provide a film having excellent flatness even if a bending resistant and curable resin is provided for an organic electroluminescence display device, and in particular, it can be suitably used as a cover film on the front surface of the display device.

It is the schematic which shows the test of static flexibility by the mandrel test.

Hereinafter, the film for an organic electroluminescence display device according to the present invention will be described in detail together with embodiments.
The film for an organic electroluminescence display device of the present invention has a bending hysteresis 2HB obtained from bending tests in the longitudinal direction and the width direction of 0.01 gf · cm / cm or more and 0.04 gf · cm / cm or less. When the bending hysteresis 2HB is in the above range, it is excellent in static flexibility and flatness when a curable resin layer by hard coating or the like is provided. Here, the static flexibility is evaluated by the method described in the evaluation method (12) static flexibility by the mandrel test, and the flatness when the curable resin layer is provided by a hard coat or the like is evaluated by the evaluation method (13) curing. The appearance after coating with the sex resin is evaluated by the method described. If the bending hysteresis exceeds 0.04 gf · cm / cm, the static flexibility deteriorates, and if it is less than 0.01 gf / cm / cm, the flatness when the curable resin layer is provided is inferior. The stress applied to the film when the static bending test is performed is compression on the inside of the film bending and tension on the outside of the bending. To obtain resistance to bending, the resistance to stress applied in either the film surface direction or the thickness direction is required. It is important to have. When controlling the bending hysteresis 2HB to 0.04 gf · cm / cm or less, for example, when a polyester film is used and the plane orientation is increased, resistance to the plane direction, that is, resistance to pulling on the outside of bending in static bending can be obtained. However, since the refractive index in the thickness direction is lowered, resistance to compression inside the bending cannot be obtained, and the bending hysteresis 2HB may not be 0.04 or less. Therefore, in order to set the bending hysteresis 2HB to 0.04 or less, it is preferable to set the thickness direction refractive index to 1.5 or more. Further, from the viewpoint of obtaining bending resistance in the plane direction, the plane orientation coefficient obtained by subtracting the thickness direction refractive index from the average refractive index in the longitudinal direction and the width direction, which indicates the degree of orientation in the plane direction, is set to 0.12 or more and 0.16 or less. It is preferable to control. The refractive index and the surface orientation coefficient in the plane direction and the thickness direction of the film can be adjusted by the stretching temperature under the film forming conditions, the area stretching ratio, the heat treatment temperature after stretching, and the crystallinity of the resin. In the manufacturing method that employs sequential biaxial stretching, in order to make the thickness direction refractive index 1.5 or more, the stretching temperature in the longitudinal direction is equal to or higher than the glass transition temperature of the resin + 20 ° C or lower, and the stretching temperature in the width direction is the glass transition temperature of the resin. A method of setting the area stretching ratio to 8 times or more and 12 times or less as 20 ° C. or higher and 60 ° C. or lower can be mentioned. Further, the higher the crystallinity, the smaller the refractive index in the thickness direction after stretching tends to be, and the crystallinity of the resin can be controlled by introducing a copolymerization component. Taking the case where polyethylene terephthalate is used among polyesters as an example, the crystallinity can be lowered by copolymerizing isophthalic acid, cyclohexanedimethanol, or the like.
When the thickness of the film for an organic electroluminescence display device of the present invention exceeds 35 μm, the curvature of the film in the static bending test is large, and the bending hysteresis 2HB may be 0.04 gf · cm / cm or more. It is important that the thickness of the entire film is 35 μm or less. Further, for a so-called stiff and flexible resin such as silicone rubber, soft vinyl chloride, and biaxially stretched polypropylene film, the bending hysteresis may be 0.04 gf · cm / cm even if the film thickness is 35 μm or more. However, there is a concern that it will be less than 0.01 gf / cm / cm, and it is not preferable for display applications where thinning is required. Further, in the case of resins other than polyester, when the bending hysteresis 2HB is set to 0.04 or less, there is a resin having a low bending hysteresis 2HB even if the mechanical strength is about the same as that of the polyester film, and specifically, polyphenylene sulfide. The film using the above has a low bending hysteresis 2HB. It is presumed that it is derived from the fact that there are few aliphatic compounds as the monomer constituent unit.
^{The film for an organic electroluminescence display device of the present invention has a bending hardness of 0.01 gf · cm 2} / cm in both the longitudinal direction and the width direction from the viewpoint of maintaining flatness when a curable resin layer such as a hard coat layer is applied. It is preferably cm or more and 0.1 gf · cm ² / cm or less. It is preferably at most 0.04gf · ^cm 2 / ^cm or more 0.1gf · ^cm 2 / ^cm. In order to make the above range, a method of setting the thickness of the film to 15 μm or more and 35 μm or less can be mentioned. Further, since the bending hardness can be increased by strengthening the orientation of the film, the thickness and the orientation of the film may be adjusted according to the required characteristics.
The film for an organic electroluminescence display device of the present invention has a heat shrinkage rate of 150 ° C. in the width direction of 1% from the viewpoint of dimensional stability during coating of a curable resin layer such as a hard coat layer and suppression of warpage as a display device. It is preferable that the heat shrinkage rate at 150 ° C. in the longitudinal direction is -2% or more and 2% or less with respect to the heat shrinkage rate at 150 ° C. in the width direction. By setting the heat shrinkage rate at 150 ° C. within the above range, it is possible to reduce dimensional changes in the drying process when laminating layers containing a curable resin and warpage when used as a display device. Here, the heat shrinkage in the longitudinal direction and the width direction at 150 ° C. is carried out by the method described in the evaluation method (9) 150 ° C. heat shrinkage rate.

As a method of setting the heat shrinkage rate of 150 ° C. in the width direction to 1% or less and the heat treatment rate of 150 ° C. in the longitudinal direction to be in the range of -2% or more and 2% or less with respect to the heat treatment rate of 150 ° C. in the width direction. , A method of adjusting the film forming conditions, a method of performing an off-annealing treatment, etc. As the film forming conditions, for example, the heat treatment after stretching may be set to a high temperature of 220 ° C. or higher and 250 ° C. or lower, or 220 ° C. to 220 ° C. A method of relaxing the film by 3% or more during the heat treatment at 250 ° C. is preferable.
From the viewpoint of appearance as a display device, the film for an organic electroluminescence display device of the present invention preferably has an orientation angle variation of 5 degrees or less in a range of 10 cm × 20 cm of the film. By setting the variation of the orientation angle in the range of 10 cm × 20 cm of the film to 5 degrees or less, color unevenness when visually recognized as a display device is suppressed, and good appearance can be achieved. Here, in the present invention, the variation of the orientation angle in the range of 10 cm × 20 cm of the film was evaluated as shown in (10) The variation of the orientation angle in the range of 10 cm × 20 cm of the film. The variation of the orientation angle in the range of 10 cm × 20 cm of the film is more preferably within 4 degrees, and most preferably within 3 degrees.

In the film for an organic electroluminescence display device of the present invention, as a method of keeping the variation of the orientation angle in the range of 10 cm × 20 cm of the film within 5 degrees, for example, the heat treatment after stretching is divided into a plurality of zones and gradually increased. A method of heating / lowering the temperature and a method of slightly stretching in the width direction in the heat treatment step are preferably adopted. For example, the first half temperature of the heat treatment is slightly stretched from 180 ° C. to 210 ° C. in the width direction by 1% or more and 10% or less, preferably 3% or more and 10% or less, and the second half temperature of the heat treatment is 200 ° C. or more and 240 ° C. or less and 1% in the width direction. Examples thereof include a method of finely stretching 10% or more, preferably 3% or more and 10% or less.
The film for an organic electroluminescence display device of the present invention preferably has a film thickness of 13 μm or more and 35 μm or less, preferably 15 μm, from the viewpoint of handleability, scratch resistance, bending resistance, and flatness when a curable resin is applied. It is more preferably 35 μm or more, and most preferably 15 μm or more and 30 μm or less. Further, when the thickness is 35 μm or more, the bending hysteresis recovery 2HB tends to be very high regardless of the material, and therefore it is preferably 35 μm or less.
When the film for an organic electroluminescence display device of the present invention is used for a display, the b value obtained from the spectrocolorimeter is 2.0 or less, and the total light transmittance is 90% or more. Is preferable. The b value can be adjusted to 2.0 or less by using polyester, polycarbonate, acrylic, polyamide, polyimide, nylon or the like, and the total light transmittance can be 90% or more. Above all, it is preferable that the film for an organic electroluminescence display device of the present invention contains polyester as a main component because it is inexpensive and highly productive.
Glycols or derivatives thereof that give polyesters include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, and 1, , An aliphatic dihydroxy compound such as 6-hexanediol and neopentyl glycol, polyoxyalkylene glycol such as diethylene glycol, polyethylene glycol, polypropylene glycol and polytetramethylene glycol, and alicyclic group such as 1,4-cyclohexanedimethanol and spiroglycol. Examples thereof include aromatic dihydroxy compounds such as dihydroxy compounds, bisphenol A and bisphenol S, and derivatives thereof.

Further, as the dicarboxylic acid or a derivative thereof that gives the polyester used in the present invention, terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenylsulfonedicarboxylic acid, diphenoxyetanedicarboxylic acid, 5 -Aromatic dicarboxylic acids such as sodium sulfonedicarboxylic acid, aliphatic dicarboxylic acids such as oxalic acid, succinic acid, adipic acid, sebacic acid, dimer acid, maleic acid and fumaric acid, and alicyclic such as 1,4-cyclohexanedicarboxylic acid. Examples thereof include oxycarboxylic acids such as group dicarboxylic acids and paraoxybenzoic acids, and derivatives thereof. Derivatives of the dicarboxylic acid include, for example, dimethyl terephthalate, diethyl terephthalate, 2-hydroxyethylmethyl ester terephthalate, dimethyl 2,6-naphthalenedicarboxylic acid, dimethyl isophthalate, dimethyl adipate, diethyl maleate, dimethyl dimerate and the like. Esterates can be mentioned.
As for the composition of the polyester in the present invention, 80 mol% or more of the glycol unit is preferably a structural unit derived from ethylene glycol, more preferably 85 mol% or more, and most preferably 90 mol% or more. Further, it is preferable that 80 mol% or more of the dicarboxylic acid unit is a structural unit derived from terephthalic acid, more preferably 85 mol% or more, and most preferably 90 mol% or more.
The film for an organic electroluminescence display device of the present invention is preferably a laminated sheet for an organic electroluminescence display device having a layer containing a curable resin on at least one side. By having a layer containing a curable resin on at least one side, it is possible to enhance the effect of suppressing scratches against an impact from the curable resin layer side.
Here, the curable resin refers to a resin that forms a crosslinked structure and is cured by irradiating it with heat or light. The curable resin is not particularly limited, but is preferably a thermosetting resin or an ultraviolet curable resin, and specifically, an organic silicone type, a polyol type, a melamine type, an epoxy type, a polyfunctional acrylate type, or a urethane type. Examples thereof include resins such as isocyanate-based, organic-inorganic hybrid-based which is a composite material of an organic material and an inorganic material, and silsesquioxane-based which has a curable functional group. More preferably, it is an epoxy-based, polyfunctional acrylate-based, organic-inorganic hybrid-based, or silsesquioxane-based resin. More preferably, it is a polyfunctional acrylate-based resin, an organic-inorganic hybrid-based resin, or a silsesquioxane-based resin.

As the polyfunctional acrylate-based and silsesquioxane-based resins used as the curable resin, polyfunctional acrylate monomers, oligomers, urethane acrylate oligomers, alkoxysilanes, alkoxysilane hydrolysates, alkoxysilane oligomers, and the like are preferable. Examples of the polyfunctional acrylate monomer include a polyfunctional acrylate having two or more (meth) acryloyloxy groups in one molecule and a modified polymer thereof, and specific examples thereof include pentaerythritol tri (meth) acrylate and pentaerythritol. Tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, trimethylpropantri (meth) acrylate , Penta-eristol triacrylate hexane methylene diisocyanate urethane polymer and the like can be used. These monomers may be used alone or in admixture of two or more.

Further, in the present invention, it is preferable that the layer containing the curable resin contains one or more kinds of particles. Here, the particles may be either inorganic particles or organic particles, but it is preferable to contain the inorganic particles in order to improve the surface hardness. The inorganic particles are not particularly limited, and examples thereof include metal and metalloid oxides, siliconized products, nitrides, boronized products, chlorides, and carbonates. Specifically, silica (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO), zirconium oxide (ZrO ₂ ), titanium oxide (TIO ₂ ), antimony oxide (Sb ₂ O ₃ ) and indium. At least one particle selected from the group consisting of tin oxide (In ₂ O _{3) is preferred.} When particles are introduced for the purpose of improving the surface hardness, the particle size is preferably 1 nm or more and 300 nm or less. The particle size is more preferably 50 nm or more and 200 nm or less, and further preferably 100 nm or more and 150 nm or less in that surface hardness and bending resistance are compatible at a higher level. The particles are preferably surface-treated. The surface treatment referred to here is to introduce a compound onto the particle surface by chemical bond (including covalent bond, hydrogen bond ionic bond, van der Waals bond, hydrophobic bond, etc.) or adsorption (including physical adsorption, chemical adsorption). To say.

Further, the content ratio of the curable resin and the particles is preferably particles / resin = 20/80 to 80/20 in terms of mass ratio. If the particle / resin is less than 20/80, the surface hardness may be insufficient, and if it exceeds 80/20, the bending resistance may be lowered. The mass ratio of the particles / resin is more preferably 30/70 to 70/30, and even more preferably 40/60 to 60/40, because both surface hardness and bending resistance are compatible at a higher level. ..

In the laminated sheet for an organic electroluminescence display device of the present invention, the average roughness SRa of the surface of the layer containing a curable resin is preferably 1 to 10 nm. If SRa is less than 1 nm, the surface slipperiness is poor and scratches may occur, and if Ra exceeds 10 nm, protrusions may be scraped and scratches may occur. The average roughness Ra is more preferably 2 to 8 nm, and further preferably 3 to 7 nm, because scratches are less likely to occur. The average roughness Ra of the surface of the cured layer can be set to 1 to 10 nm by adding particles having the above particle size at the above content.
In the present invention, a curable resin is contained on both sides of the film for an organic electroluminescence display device of the present invention in order to further enhance the effect of improving scratch resistance and to suppress curling of the entire laminated sheet by forming a curable resin layer. It is preferable to have a laminated structure having layers.
The layer containing the curable resin of the present invention preferably has a thickness of 1 μm or more and 20 μm or less. If the thickness of the layer containing the curable resin is thinner than 1 μm, sufficient surface hardness may not be obtained. Further, if the thickness of the layer containing the curable resin exceeds 20 μm, cracks may occur in the layer containing the laminated curable resin when the laminated sheet is bent. The thickness of the layer containing the curable resin is more preferably 2 μm or more and 15 μm or less, and most preferably 3 μm or more and 10 μm or less. In the case of a structure having layers containing a curable resin on both sides of the film, it is preferable that the thickness of the layers containing the curable resin on each side is 1 μm or more and 20 μm or less. Further, the layer containing the curable resin of the present invention may be formed of one layer or two or more layers.
The laminated sheet for an organic electroluminescence display device of the present invention has an easy-adhesion resin layer having a thickness of 10 nm or more and 500 nm or less between a film for an organic electroluminescence display device and a layer containing a curable resin, and the easy-adhesion resin. The surface free energy of the layer is preferably 38 mN / m or more. By having a resin layer having a thickness of 10 nm or more and 500 nm or less and a surface free energy of 38 mN / m or more, the adhesion between the film and the layer containing the curable resin is improved, and the bending resistance of the laminated sheet is improved. Is improved. The thickness of the easy-adhesive resin layer is more preferably 20 nm or more and 400 nm or less, and most preferably 30 nm or more and 300 nm or less. The surface free energy of the easy-adhesion resin layer is more preferably 40 mN / m or more, and most preferably 42 mN / m or more.

Next, an example of a specific manufacturing method of the film for an organic electroluminescence display device and the laminated sheet for an organic electroluminescence display device of the present invention will be described. Here, polyethylene terephthalate is used as an example of the resin constituting the film, but the present invention is not construed as being limited to such an example.

First, as a resin used for a film, a polyethylene terephthalate resin is dried and pre-crystallized, and then supplied to a uniaxial extruder for melt extrusion. At this time, it is preferable to control the resin temperature to 265 to 295 ° C. Next, foreign matter is removed and the extrusion amount is leveled through a filter and a gear pump, and the T-die discharges the foreign matter onto the cooling drum in the form of a sheet. At that time, the electrostatic application method in which the cooling drum and the resin are brought into close contact with each other by electrostatic force using an electrode to which a high voltage is applied, the casting method in which a water film is provided between the casting drum and the extruded polymer sheet, and the casting drum temperature are set to polyester resin. The sheet-like polymer is brought into close contact with the casting drum, cooled and solidified, and unstretched by a method of adhering the extruded polymer from the glass transition point to (glass transition point -20 ° C) or a method of combining a plurality of these methods. Get the film. Among these casting methods, when polyester is used, the method of electrostatically applying is preferably used from the viewpoint of productivity and flatness.

The unstretched film obtained in the casting step is stretched in the longitudinal direction and then stretched in the width direction, or stretched in the width direction and then stretched in the longitudinal direction by a sequential biaxial stretching method, or in the longitudinal direction of the film. It can be obtained by stretching by a simultaneous biaxial stretching method in which the width direction is stretched almost simultaneously, and the stretching ratio in such a stretching method is 2 to 4 times in each direction. From the viewpoint of thickness unevenness, it is preferable to stretch 2.5 times or more in each direction, and when the plane orientation coefficient is 0.12 to 0.16, the area stretching ratio is 8 times or more and 12 times or less. Is preferable. Further, the stretching temperature is preferably set to such an extent that stretching unevenness does not occur, and from the viewpoint of setting the thickness direction refractive index to 1.5 or more, for example, a sequential biaxial stretching method in which stretching is performed in the longitudinal direction and then in the width direction. In the case of adopting, the preheating temperature in the longitudinal direction is preferably the glass transition temperature of the resin -20 ° C or more and + 0 ° C or less, the stretching temperature is preferably the glass transition temperature of the resin or more and + 20 ° C or less, and the preheating temperature in the width direction is the resin. The glass transition temperature of the resin is preferably + 20 ° C. or lower, and the stretching temperature is preferably the glass transition temperature of the resin + 10 ° C. or higher and + 60 ° C. or lower. Further, the stretching may be performed a plurality of times in each direction.

Further, the film for an organic electroluminescence display device of the present invention is preferably stretched in the width direction and then heat-treated. The heat treatment can be performed by any conventionally known method such as in an oven or on a heated roll. The heat treatment is preferably 160 ° C. to 240 ° C., and the temperature of the hottest heat treatment zone is preferably 220 ° C. or higher and 240 ° C. or lower. Further, the heat treatment can be divided into a plurality of zones to gradually raise or lower the temperature, or a method of finely stretching the temperature in the width direction to about 1.01 to 1.2 times in the heat treatment step can also be used. The heat treatment time can be arbitrary as long as the characteristics are not deteriorated, and is preferably 10 to 60 seconds, more preferably 15 to 30 seconds. Further, the heat treatment may be performed by relaxing the film in the longitudinal direction and / or the width direction.

Further, the film for an organic electroluminescence display device of the present invention is easy to have at least 10 nm or more and 500 nm or less on one side and a surface free energy of 38 mN / m or more from the viewpoint of adhesion to a layer containing a curable resin. It is preferable to laminate the adhesive resin layer, but as a method for forming the easy-adhesive resin layer, the film surface is coated with the easy-adhesive resin (composite melt extrusion method, hot melt coating method, solvent other than water, water-soluble and / Alternatively, a method of in-line coating from a water-dispersible resin, an offline coating method, etc.), a surface lamination method of a similar composition or a blended product thereof, etc. can be mentioned. Among them, the in-line coating method in which a film coating agent is applied to one surface of the film before the alignment crystallization is completed, stretched in at least one direction, and heat-treated to complete the alignment crystallization is used to form a uniform film. Industrially preferable. When the easy-adhesion resin layer is provided by coating, the resin to which the easy-adhesion resin layer is applied is not particularly limited, but for example, acrylic resin, urethane resin, polyester resin, olefin resin, etc. Fluorine-based resin, vinyl-based resin, chlorine-based resin, styrene-based resin, various graft-based resins, epoxy-based resin, silicone-based resin and the like can be used, and a mixture of these resins can also be used. From the viewpoint of adhesion, it is preferable to use a polyester resin, an acrylic resin, or a urethane resin. When a polyester resin is used as an aqueous coating liquid, a water-soluble or water-dispersible polyester resin is used. For such water-soluble or water-dispersible, a compound containing a sulfonic acid base or a carboxylic acid is used. It is preferable to copolymerize a compound containing an acid base. When an acrylic resin is used as an aqueous coating liquid, it must be in a state of being dissolved or dispersed in water, and examples of the emulsifier include surfactants (for example, polyether compounds), but the emulsifiers are not limited. No.) may be used.

Further, in the easy-adhesion resin layer used in the present invention, various cross-linking agents can be used in combination with the resin in order to further improve the adhesiveness. As the cross-linking agent resin, a melamine-based resin, an epoxy-based resin, or an oxazoline-based resin is generally used. Examples of the particles contained in the resin layer of the present invention include inorganic particles and organic particles, but inorganic particles are more preferable because they improve slipperiness and blocking resistance. As the inorganic particles, silica, alumina, kaolin, talc, mica, calcium carbonate, titanium and the like can be used.

Next, a method for manufacturing a laminated sheet for an organic electroluminescence display device of the present invention will be illustrated.

As a method, it is preferable to apply a coating agent containing a curable resin on a film substrate, dry it, and cure it in this order. When the layer containing the curable resin is composed of two or more layers, for example, the coating material C made of the curable resin C and the coating material D made of the curable resin D are sequentially or simultaneously applied on the film substrate. It is preferable to use a production method obtained by applying, drying, and curing in this order. Here, the sequential coating means that a first cured layer is formed by applying, drying, and curing one type of coating agent using a dip coating method, a roller coating method, a wire bar coating method, a gravure coating method, a die coating method, or the like. This is a method of forming a second cured layer by applying, drying, and curing a coating agent different from the first type on the first cured layer. The type and number of cured layers to be prepared can be appropriately selected. Simultaneous coating, which is mentioned as the other manufacturing method, is a method in which two or more kinds of coating agents are simultaneously applied, dried, and cured using a multi-layer slit die to obtain two or more cured layers by one application. .. The drying method referred to here includes heat transfer drying, drying by hot air, drying by infrared irradiation, and drying by microwave irradiation, and is not particularly limited, but drying by hot air irradiation is preferable.

Further, examples of the curing method referred to here include thermal curing by heat and curing by irradiating an active energy ray such as an electron beam or ultraviolet rays. In the case of thermosetting, it is preferable to cure at a temperature of room temperature or more and 200 ° C. or less, and more preferably 80 ° C. or more and 200 ° C. or less. When curing by irradiating with ultraviolet rays or electron beams, it is preferable to reduce the oxygen concentration as much as possible, and it is preferable to cure in an inert gas atmosphere. If the oxygen concentration is high, curing may be insufficient. Further, examples of the type of ultraviolet lamp used when irradiating ultraviolet rays include a discharge lamp type, a flash type, a laser type, and an electrodeless lamp type. When the discharge lamp type to ultraviolet cured using a high pressure mercury lamp is, it is preferable that the illuminance of ultraviolet rays is 100 mW / cm ² or more 3,000 mW / cm ² or less, more preferably 200 mW / cm ² or more 2,000 mW / cm ^{It is 2} or less. More preferably, at 200 mW / cm ² or more 1,500 mW / cm ² or less.

The film for an organic electroluminescence display device and the laminated sheet for an organic electroluminescence display device of the present invention are particularly suitable as a cover film for an organic electroluminescence display device because they are excellent in bending resistance and flatness after coating with a curable resin layer. Can be used. By applying it as a cover film of an organic electroluminescence display device, it is possible to prevent scratches on the surface of the display device without impairing the flexibility of the display device.

The laminated sheet for an organic electroluminescence display device of the present invention is a display device having a circularly polarizing plate, and the total thickness of the laminated sheet and the circularly polarizing plate is preferably 120 μm or less. By setting the total thickness of the laminated sheet and the circularly polarizing plate to 120 μm or less, the flexibility of the display device is increased, and the display device can be folded or rolled. The total thickness of the laminated sheet and the polarizing plate is more preferably 110 μm or less, and most preferably 100 μm or less. Further, the organic electroluminescence display device using the laminated sheet for the organic electroluminescence display device of the present invention is preferably composed of the laminated sheet, a circular polarizing plate, and an organic electroluminescent element.

The circular polarizing plate in the display device using the laminated sheet for the organic electroluminescence display device of the present invention can be applied to an organic electroluminescence display device or the like by using an optical film (λ / 4 retardation film) to obtain visible light. At all wavelengths, the effect of shielding the mirror reflection of the metal electrode of the organic electroluminescence element can be exhibited, reflection during observation can be prevented, and black expression can be improved. In the circularly polarizing plate in the display device using the laminated sheet for the organic electroluminescence display device of the present invention, it is preferable that the polarizer is sandwiched between an optical film (λ / 4 retardation film) and a protective film. The polarizer can be obtained by uniaxially stretching the polyvinyl alcohol film and then dyeing it, or by dyeing the polyvinyl alcohol film and then uniaxially stretching it, preferably further performing a durability treatment with a boron compound.

The configuration of the organic electroluminescence element of the organic electroluminescence display device using the laminated sheet for the organic electroluminescence display device of the present invention is not particularly limited, but has, for example, the following layer structures (i) to (vi). You may. Further, the following light emitting layer is preferably composed of a blue light emitting layer, a green light emitting layer and a red light emitting layer.

A typical example of the configuration of the organic EL element is shown below.
(I) Anophode / hole injection transport layer / light emitting layer / electron injection transport layer / cathode (i) anode / hole injection transport layer / light emitting layer / electron injection transport layer / cathode (ii) anode / hole injection transport layer / Light emitting layer / Hole blocking layer / Electron injection transport layer / Cathode (iii) Anosome / Hole injection transport layer / Electron blocking layer / Light emitting layer / Hole blocking layer / Electron injection transport layer / Catabol (iv) anode / Positive Pore injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer / cathode (v) anode / hole injection layer / hole transport layer / light emitting layer / hole blocking layer / electron transport layer / electron injection Layer / cathode (vi) anode / hole injection layer / hole transport layer / electron blocking layer / light emitting layer / hole blocking layer / electron transport layer / electron injection layer / cathode

Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited to these Examples. The characteristics were measured by the following methods.

(1) Film Thickness When measuring the total thickness of the film, the thickness of the sample cut out from the film was measured at five arbitrary locations using a dial gauge, and the average value was calculated.

(2) Thickness of Curable Resin Layer and Easy Adhesive Resin Layer The thickness of the curable resin layer on the film was measured by observing the cross section using a transmission electron microscope (TEM). The thickness of the curable resin layer was read from an image taken by TEM at a magnification of 100,000 times. The thicknesses of the curable resin layer and the easy-adhesion resin layer at 10 points in total were measured, and the average value was used. The observation magnification may be other than 100,000 times as long as the thickness can be measured.

(3) Cut out a sample with a size of 100 mm × 100 mm at an arbitrary point on the main orientation axis film, and use a microwave molecular orientation meter MOA-2001A (frequency 4 GHz) manufactured by KS Systems (currently Oji Measuring Instruments Co., Ltd.) on the film surface. The main orientation axis inside was determined and set as the longitudinal direction, and the direction orthogonal to the longitudinal direction was defined as the width direction.
(4) Bending hysteresis 2HB
Using a multipurpose bending tester (KES-FB2) manufactured by Kato Tech Co., Ltd., measurements were performed in the longitudinal direction and the width direction under the following conditions to obtain bending hysteresis 2HB. For the bending hysteresis 2HB, the data obtained in the 5th cycle (5 repetitions) was adopted with the ^{curvature −2.5 to +2.5 cm -1 as one cycle.}
Number of repetitions: 5 times (5th cycle of recruitment data)
SENS: 2x5
Curvature: -2.5 to +2.5 cm ^-1
Deformation speed: 0.50 cm ^-1 / sec
Sample size: longitudinal direction x width direction = 20 cm x 20 cm
(5) Flexural Rigidity Using a multipurpose bending tester (KES-FB2) manufactured by Katou Tech Co., Ltd., measurements were taken in the longitudinal direction and the width direction under the following conditions to obtain the flexural rigidity. For the flexural rigidity, the data obtained in the 5th cycle (5 repetitions) was adopted, with the ^{curvature −2.5 to +2.5 cm -1 as one cycle.}
Number of repetitions: 5 times (5th cycle of recruitment data)
SENS: 2x5
Curvature: -2.5 to +2.5 cm ^-1
Deformation speed: 0.50 cm ^-1 / sec
Sample size: longitudinal direction x width direction = 20 cm x 20 cm
(6) Film refractive index and plane orientation coefficient Using a sodium D line (wavelength 589 nm) as a light source and using an Abbe refractometer, the refractive index in the longitudinal direction (n _MD ) and the refractive index in the width direction (n _TD ) of the film are determined. The refractive index (n _ZD ) in the thickness direction was measured, and the plane orientation coefficient (fn) was calculated from the following formula. In the present invention, when the longitudinal direction and the width direction of the film are unknown, the measurement was performed with the main orientation axis direction as the longitudinal direction and the direction orthogonal to the main orientation axis direction as the longitudinal direction.
fn = (n _MD + n _TD ) / 2-n _ZD
(7) Composition of the resin constituting the film The film is dissolved in hexafluoroisopropanol (HFIP), and the content of each monomer residue and by-product diethylene glycol is quantified using ^{1 1} H-NMR and ^{13 C-NMR.}
(8) Glass transition temperature of resin
According to JIS K7121 (1987), the glass transition temperature of the resin was measured using the differential scanning calorimetry robot DSC-RDC220 manufactured by Seiko Electronics Co., Ltd. and the "disk session" SSC / 5200 for data analysis. ..

(9) Heat Shrinkage Rate at 150 ° C. The film was cut into rectangles having a length of 150 mm and a width of 10 mm in the longitudinal direction and the width direction, respectively, and used as samples. Marked lines were drawn on the sample at intervals of 100 mm (positions of 50 mm from the center to both ends), and a 3 g weight was hung and placed in a hot air oven heated to 150 ° C. for 30 minutes for heat treatment. The distance between the marked lines after the heat treatment was measured, and the heat shrinkage rate was calculated from the change in the distance between the marked lines before and after the heating by the following formula.
Heat shrinkage rate (%) = {(distance between marked lines before heat treatment)-(distance between marked lines after heat treatment)} / (distance between marked lines before heat treatment) × 100.

(10) Variation of orientation angle in the range of film 10 cm × 20 cm Prepare a sample of 20 cm (E direction) × 30 cm (F direction) at any point of the film, and microwave molecules manufactured by KS Systems (currently Oji measuring equipment). Using an orientation meter MOA-2001A (frequency 4 GHz), the main orientation axis at the center (point G) of the sample was determined and used as the reference direction. Subsequently, the main orientation axes are obtained from the four corners of the 20 cm (E direction) × 30 cm (F direction) sample at positions (4 locations) 5 cm in the E direction and 5 cm in the F direction toward the center of the film, respectively, and used as a reference. The angle formed with the direction was defined as the orientation angle of the position. When the measurement positions (4 points) are connected, the size becomes 10 cm in the E direction and 20 cm in the F direction with the G point as the center, and the largest angle among the orientation angles at the 4 measurement positions is set as the film. The orientation angle was varied in the range of 10 cm × 20 cm.

(11) Fabrication of circularly polarizing plate (circularly polarized light-I)
A polyvinyl alcohol film having a thickness of 40 μm was uniaxially stretched (temperature 110 ° C., stretching ratio 5 times). This was immersed in an aqueous solution consisting of 0.075 g of iodine, 5 g of potassium iodide and 100 g of water for 60 seconds. Then, it was immersed in an aqueous solution at 68 ° C. consisting of 6 g of potassium iodide, 7.5 g of boric acid, and 100 g of water. This was washed with water and dried to obtain a polarizer. A λ / 4 retardation film (cyclic olefin film 23 μm) in which one surface of the obtained polarizing element was previously corona-treated, and a protective film (triacetylcell roll film 25 μm) in which the other surface was preliminarily saponified. Was bonded via an adhesive to prepare a circularly polarizing plate having a thickness of 60 μm.

(Circular Polarizing Plate-II)
The thickness of the polyvinyl alcohol film is 80 μm, the thickness of the λ / 4 retardation film is 33 μm, the thickness of the protective film is 40 μm, and a circularly polarizing plate having a thickness of 95 μm is produced in the same manner as the circularly polarizing plate-I. bottom.

(12) Fabrication of Organic Electroluminescence Display Device The film / circular polarizing plate / organic electroluminescence panel (LG Display 15EL9500) of the present invention is passed through an acrylic adhesive (thickness 20 μm), respectively, to an organic electroluminescence panel (LG). An organic electroluminescence display device was manufactured by laminating it on the visual side of a display company (trade name 15EL9500).

(13) Static flexibility by mandrel test A film cut out in the longitudinal direction x width direction = 15 mm x 30 mm was humidity-controlled for 24 hours under the condition of 23 ° C. and 60% RH, and the center of the pedestal of the mandrel tester (manufactured by Ueshima Seisakusho). Install as shown in Fig. 1 so that the center of the film and the center of the film coincide with each other. A test rod having a diameter of 1.0 mm is installed, the film is folded at 180 ° C., and the film is allowed to stand for 24 hours. After that, the film was taken out, immediately placed on a flat floor, and the height raised from the ground was read. The cutting direction of the sample is set to the width direction × the longitudinal direction = 15 mm × 30 mm, and the raised height is read in the same manner. Each of the samples in each direction was measured 5 times, and the static flexibility was determined as follows from the average value of the raised heights 10 times in total.

Less than 0.2 mm: ◎
0.2 mm or more and less than 0.4 mm: ○
0.4 mm or more and less than 0.5 mm: △
0.5 mm or more: ×
(14) Appearance after application of curable resin The curable resin Q described below (formulation of curable resin Q) is applied using a slot die coater by controlling the flow rate so that the thickness after drying becomes 5 μm. , 100 ° C. for 1 minute to remove the solvent. Next, the film coated with the curable resin was irradiated with ultraviolet rays of ^{300 mJ / cm 2 using a high-pressure mercury lamp to obtain a laminated sheet.} The appearance of the obtained laminated sheet after application of the curable resin layer was determined as follows for (a) wrinkles and (b) curls.
(A) No wrinkles and good flatness of the entire sheet: ◎
There is slight film distortion: ○
Obvious film distortion is scattered, but there is no problem in practical use: △
The entire film swells and cannot be used: ×
(B) When the curl film was cut out to A4 size and placed on a flat surface, it was determined as follows based on the height at which it was lifted from the ground.
No film lift: ◎
The lift of the film is less than 10 mm above the ground: ○
The lift of the film is 10 mm or more and less than 15 mm from the ground: Δ
The lift of the film exceeds 15 mm from the ground: ×
(Manufacturing of polyester)
The polyester resin used for film formation was prepared as follows.

(Polyester A)
A polyethylene terephthalate resin (intrinsic viscosity 0.65) containing 100 mol% of a terephthalic acid component as a dicarboxylic acid component and 100 mol% of an ethylene glycol component as a glycol component.

(Polyester B)
Polyester resin containing 100 mol% of terephthalic acid component as dicarboxylic acid component, 12 mol% of 1-4, cyclohexanedimethanol component as glycol component, and 80 mol% of ethylene glycol component (intrinsic viscosity 0.70)
(Polyester C)
Polyester resin containing 15 mol% of isophthalic acid as a dicarboxylic acid component, 83 mol% of a terephthalic acid component, and 100 mol% of an ethylene glycol component as a glycol component (intrinsic viscosity 0.65).
(Polyphenylene sulfide)
Add 100 mol of sodium sulfide 9 hydroxide, 45 mol of sodium acetate and 25 liters of N-methyl-2-pyrrolidone (hereinafter abbreviated as NMP) to an autoclave (maximum working pressure: 14 MPa), and gradually stir. The temperature was raised to 220 ° C., and the contained water was removed by distillation. In the dehydrated system, 100 mol of p-dichlorobenzene was added as a main component monomer together with 5 liters of NMP, and the simple substance was pressurized and sealed at ^{3 kg / cm 2 at a temperature of 170 ° C., and then the temperature was raised to 270 ° C.} Was polymerized for 4 hours. After completion of the polymerization, the polymer was cooled, the polymer was precipitated in distilled water, and a small mass polymer was collected by a wire mesh containing 150 mesh openings. The small lump polymer thus obtained was washed twice with distilled water at 90 ° C., washed three times with an aqueous solution of sodium acetate, washed once with distilled water, and dried at a temperature of 120 ° C. under reduced pressure. Then, granules of a polyarylene sulfide resin having a melting point of 280 ° C. were obtained. These granules are put into a uniaxial rotary twin-screw kneading extruder with a vent heated to 320 ° C. (manufactured by Japan Steel Works, screw diameter 30 mm, screw length / screw diameter = 45.5), and the residence time is 90 seconds. , It was melt-extruded at a screw rotation speed of 150 rpm and discharged into a strand, cooled with water at a temperature of 25 ° C., and immediately cut to prepare a chip to obtain polyphenylene sulfide.

(Polypropylene A)
TF850H, MFR: 2.9 g / 10 min manufactured by Prime Polymer Co., Ltd. was used as polypropylene A.

(Particle Master A)
Polyester terephthalate particle master (intrinsic viscosity 0.65) containing calcium carbonate particles having an average particle diameter of 1.2 μm in polyester A at a particle concentration of 1% by mass.

(Preparation of easy-adhesive resin P)
The easy-adhesive resin layer to be laminated on the surface of the film was prepared as follows.

Resin solution (a): Terephthalic acid (88 mol%) as an acid component, 5-sodium sulfoisophthalic acid (12 mol%), ethylene glycol (100 mol%) as a diol component.
), 70 parts by weight of a water-soluble coating solution of a polyester resin composed of an acid component and a diol component, and acid components such as terephthalic acid (50 mol%), isophthalic acid (49 mol%), and 5-sodium sulfoisophthalic acid (1 mol%). And 30 parts by weight of an aqueous dispersion of a polyester resin composed of the acidic components of ethylene glycol (55 mol%), neopentyl glycol (44 mol%) and polyethylene glycol (molecular weight: 4000) (1 mol%), which are diol components, and the diol component. Solution.
Cross-linking agent (b): Methylol-based melamine cross-linking agent Cross-linking agent (c): Oxazoline group-containing cross-linking agent Particles (d): Aqueous dispersion particles of collodyl silica particles having a particle diameter of 150 nm: Corodies having a particle diameter of 300 nm Aqueous dispersion of crosslinked particles Fluorine-based surfactant (f): Megafuck F-444 manufactured by DIC Co., Ltd.
By weight ratio of these, (a) / (b) / (c) / (d) / (e) / (f) = 47 parts by weight / 19 parts by weight / 20 parts by weight / 4.9 parts by weight / 0 .7 parts by weight / 0.1 parts by weight were mixed.
The refractive index is 1.57.

(Preparation of curable resin Q)
Silica particles with a particle size of 100 nm (organosilica sol manufactured by Nissan Chemical Industries, Ltd.) and polyfunctional acrylate (KAYARAD PET30 manufactured by Nippon Kayaku Co., Ltd.) are mixed at a mass ratio of 50:50, and a toluene / MEK mixed solvent (mass ratio) is mixed. At 50:50), it was diluted to prepare a curable resin.

(Examples 1 to 5, 7 to 11, Comparative Examples 1, 2, 4, 5)
As shown in Table 1, the resin type and the particle master type are mixed at the contents shown in Table 1 and put into the extruder, then melted at the extruder temperature shown in Table 2 and then melted from the T die to Table 2. It was discharged in the form of a sheet on a cooling drum controlled to the temperature described in 1. At that time, an unstretched sheet was obtained by electrostatically applying static electricity using a wire-shaped electrode having a diameter of 0.1 mm and bringing it into close contact with a cooling drum. Then, it was rapidly cooled with a cooling roll whose temperature was controlled to 10 ° C., then stretched in the longitudinal direction at the stretching temperature and stretching ratio shown in Table 2, and then cooled once. Next, both sides of this uniaxially stretched film were subjected to corona discharge treatment to set the wetting tension of the film to 55 mN / m, and the easy-adhesion resin P was applied to both sides of the film, and then the stretching temperature and stretching shown in Table 2 were performed. The film was stretched in the width direction at a magnification, heat-treated in the tenter at the heat treatment temperature shown in Table 2, and relaxed in the width direction to obtain a film having the film thickness shown in Table 2. The physical properties of the obtained film are as shown in Table 3, since bending hysteresis for Example were below 0.01gf · c m / cm or more 0.04gf · c m / cm, static flexibility and The appearance after applying the curable resin was excellent.
Further, both sides of the films obtained in Examples 1 to 5 were coated with a curable resin Q so as to have a thickness of 5 μm, and dried at 100 ° C. for 1 minute to remove the solvent. Next, the film coated with the curable resin layer was ^{irradiated with ultraviolet rays of 300 mJ / cm 2} using a high-pressure mercury lamp, and Example 7 was Example 1, Example 8 was Example 2, and Example 9 was Example 3. A laminated sheet for an organic electroluminescence display device was obtained using the films of Example 4 in Example 10 and Example 5 in Example 11. As for the laminated sheets of Examples 8 to 12 shown in Table 4, bending because hysteresis using the film is less than 0.01gf · c m / cm or more 0.04gf · c m / cm, static flexibility and The appearance was excellent.
On the other hand, the bending hysteresis for Comparative Examples 1, 2, 4 for exceeds the 0.04gf · c m / cm, was inferior in static flexibility.
(Examples 6 and 12)
Polyphenylene sulfide A was dried under reduced pressure at 180 ° C. for 3 hours, and then supplied to a full-flight single-screw extruder whose melted portion was heated to 320 ° C. at a discharge rate of 50 kg / hour. After filtering with a 16 μm cut filter heated to 300 ° C, melt extrusion is performed from a T-die (base) set at a temperature of 320 ° C, and then close contact cooling and solidification are performed while applying a static charge to a cast drum having a surface temperature of 25 ° C. A 400 μm unstretched film was obtained. Next, the obtained unstretched film was preheated with a plurality of heating rolls heated to a surface temperature of 90 ° C., and then the heating roll heated to a surface temperature of 100 ° C. and the convergence provided next to the heating rolls were different. It was stretched 3.7 times in the longitudinal direction (MD direction) with a cooling roll at 30 ° C. The uniaxially stretched sheet thus obtained is stretched 3.7 times in the longitudinal direction and the direction perpendicular to the longitudinal direction (TD direction) using a tenter at a temperature of 95 ° C., subsequently heat-treated at 260 ° C., and subsequently 260. After performing a 5% relaxation treatment in the TD direction at ° C., the mixture was cooled to room temperature to obtain a film having a thickness of 25 μm. The physical properties of the obtained film are as shown in Table 3, since bending hysteresis was less 0.01gf · c m / cm or more 0.04gf · c m / cm, static bending and curing resin coating The later appearance was excellent.
Further, both sides of the obtained film were coated with a curable resin Q so as to have a thickness of 5 μm to obtain a laminated sheet shown in Table 2. As shown in Table 4, the bending hysteresis of the laminated sheet for was below 0.02gf · c m / cm or more 0.08gf · c m / cm, it was excellent in static bending property and appearance.
(Comparative Example 3)
Polypropylene A is supplied to a single-screw melt extruder, melt-extruded at 240 ° C., foreign matter is removed with a 60 μm-cut sintering filter, and then the melt sheet is discharged to a cast drum whose surface is controlled at 80 ° C. and air is used. It was brought into close contact with a knife and cooled and solidified to obtain an unstretched sheet. Next, the film was preheated to 125 ° C. using a plurality of ceramic rolls and stretched 4.6 times at 125 ° C. in the longitudinal direction of the film. Next, the end portion was gripped by a clip and introduced into a tenter type stretching machine, preheated at 170 ° C. for 3 seconds, and then stretched 8.0 times at 165 ° C. In the subsequent heat treatment step, heat treatment is performed at 165 ° C. while giving 10% relaxation in the width direction, and then the film is guided to the outside of the tenter through a cooling step at 130 ° C. to release the clip at the end of the film, and a film having a thickness of 25 μm is released. Obtained. The physical properties of the obtained film are as shown in Table 3, since bending hysteresis was less than 0.01gf · c m / cm, but were excellent in static flexibility, the appearance of the cured resin coating It was inferior.

The film for an organic electroluminescence display device and the laminated sheet for an organic electroluminescence display device of the present invention are particularly suitable as a cover film for an organic electroluminescence display device because the bending hysteresis 2HB, which indicates resilience at the time of bending deformation, is within a specific range. Can be used for.

Claims (7)

From bending tests in the longitudinal and width directions , 90 mol% or more of the glycol unit is a structural unit derived from ethylene glycol, and 90 mol% or more of a dicarboxylic acid unit is a structural unit derived from terephthalic acid, which is a main component of polyester. resulting bending hysteresis 2HB both 0.01gf · cm / cm or more 0.04gf · cm / cm or less state, and are variations within 5 ° of the orientation angle in an arbitrary longitudinal 10 cm × width 20cm range film, A film for organic electroluminescence display devices that can be folded and rolled. The film for an organic electroluminescence display device according to claim 1, wherein the b value obtained from the spectrocolorimeter is 2.0 or less and the total light transmittance is 90% or more. Bending tester (Kato Tech Co., Ltd. (KES-FB2)) are both 0.01gf · ^cm 2 / ^cm or more bending stiffness in the longitudinal direction and the width direction is obtained from bending test using 0.1gf ^· cm 2 / cm The film for an organic electroluminescence display device according to any one of claims 1 or 2 below. Claim that at least the 150 ° C. heat shrinkage in the width direction is 1% or less, and the 150 ° C. heat shrinkage in the longitudinal direction is in the range of -2% or more and 2% or less with respect to the 150 ° C. heat shrinkage in the width direction. The film for an organic electroluminescence display device according to any one of 1 to 3. The film for an organic electroluminescence display device according to any one of claims 1 to 4, which contains polyester as a main component. The organic electroluminescence display device for full Irumu according to any one of claims 1 to 5 the thickness direction of the refractive index is 1.5 or more. A laminated sheet for an organic electroluminescence display device having a layer containing a curable resin on at least one side of the film for an organic electroluminescence display device according to any one of claims 1 to 6.

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