JP2008023892A - Protective film for optical display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective film (a protective and encapsulating film for a surface of a display) for a microcapsule type electrophoresis display (a paper-like electronic display as a common name) and an inorganic EL display, which is capable of producing by a roll to roll processing apparatus, and is highly productive and effective for a curve on the end part when encapsulating. <P>SOLUTION: The protective film for an optical display comprises a laminate (A) constituted by laminating in succession, at least, a functional layer (1), a first adhesive layer (2), and a water vapor barrier layer (3), wherein the percentage of a thickness of the first adhesive layer (2) in the total thickness of the laminate (A) is within the range of 1-16%, and the percentage of a thickness of the water vapor barrier layer (3) to a thickness of the functional layer (1) is within the range of 6-30%. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a microcapsule-type electrophoretic display (commonly referred to as a paper-like electronic display) and an inorganic EL display protective film (a protective film and a sealing film on the surface of the display).

  As a flat panel display device, a liquid crystal display device (LCD) is widely used in various applications because it is thin and can be miniaturized. As another display method aiming at further thinner and lower power consumption than such an LCD, a display device using an electrophoretic phenomenon has been developed.

  As one of display devices utilizing such an electrophoresis phenomenon, a microcapsule type electrophoresis system has been put into practical use. In this type of display device, blue, red, green, black and other liquids and charged white charged particles (titanium oxide particles) are placed in transparent microcapsules, and an image is formed by applying an external voltage. is there. Since the size of the microcapsule is as small as several tens μm to several hundred μm, when the microcapsule is dispersed in a transparent binder, it can be coated like ink. This ink is called electronic ink because an image can be drawn by applying a voltage from the outside.

  An active matrix display panel can be obtained by coating this electronic ink on a transparent resin film on which a transparent electrode is formed and bonding the resultant to a substrate on which an active matrix driving electrode circuit is formed (see, for example, Patent Document 1). .

  Usually, a component in which a transparent resin film on which a transparent electrode is formed is coated with electronic ink is called a “front plate”, and a substrate on which an electrode circuit for driving an active matrix is formed is called a “back plate”.

  As described above, “thin & flat” is the selling point of the current display (display), but a flexible inorganic EL display has been spotlighted as the next generation display. This display uses a phenomenon called “electroluminescence” in which electricity is changed to light without generating almost any heat. In general, an EL element is self-luminous and thus has high visibility, and since it is a completely solid device, it has excellent impact resistance and is easy to handle. For this reason, research and development and practical application as a pixel of a graphics display, a pixel of a television image display device, or a surface light source are in progress.

  Inorganic EL elements usually have a light emitting layer and a hole injection layer made of a fluorescent inorganic solid, or a light emitting layer and an electron injection layer, or a hole injection layer, a light emitting layer, and an electron injection layer interposed between two electrodes. The laminated structure formed is formed on a substrate (see, for example, Patent Document 2).

  By the way, the above-described microcapsule type electrophoretic display device has a problem in that the seal on the side of the panel is not sufficient, and moisture such as water vapor enters the display layer and deteriorates its electrical characteristics.

That is, the upper surface of the panel is covered with a transparent resin film, and the lower surface is blocked with a substrate. However, since it is difficult to seal the side of the panel, it is not possible to sufficiently block moisture entering from the side. It was. As a countermeasure, a configuration in which a protective film (a protective film on the display body surface and a side sealing film) is interposed has been proposed (see, for example, Patent Document 3 and Patent Document 4).

  Usually, the basic structure of the protective film is composed of a laminate (B) in which at least a functional layer (UV cut, hard coat, etc.) (10), an adhesive layer (11), and a water vapor barrier layer (12) are sequentially laminated.

  When manufacturing such a laminated body (B), it is advantageous in terms of cost to manufacture with a roll-to-roll processing facility, but naturally, the laminated body (B) must pass through a roll. For example, as shown in FIG. 4, in the case of the arrangement of the roll (13) that turns 360 degrees, when the laminate (B) passes through the roll (13), as shown in FIG. When the difference in curvature occurs between the layer (10) and the inner water vapor barrier layer (12), and the adhesive layer (11) is thick, the inner portion (14) is left and wrinkles are generated due to the difference. .

  However, even though the above-mentioned countermeasure proposal describes a protective film (a protective film and a sealing film on the surface of a display body), it does not mention a manufacturing method for preventing such wrinkles.

  Usually, as shown in FIG. 6, at least a transparent resin layer (for example, PET) (20), a transparent electrode layer (for example, ITO) (21), a light emitting layer or display layer (22), and a dielectric layer (23). , A lower electrode layer (aluminum or the like) (24) is sequentially laminated, and a microcapsule type electrophoretic display device provided with a terminal metal or lead (25), or at least a transparent electrode layer ( For example, a sealing film (C) for an optical display such as an inorganic EL display device in which ITO (21), a light emitting layer or display layer (22), and a lower electrode layer (aluminum, etc.) (24) are sequentially laminated. The function of the sealing film (C) for blocking external moisture during the production is as follows: (1) PET as the base material of the ITO electrode (2) Aluminum foil of the back electrode (3) Each of the terminal metal or lead polyimide Adhering to the material, typical phosphor It is necessary to play a role of protecting the emitted light or the light emitting element.

  Moreover, when sealing an optical display body using a sealing film (C), problems, such as a level | step difference occurring in the bending of a (wrinkle) part (26), may arise.

Prior art documents are shown below.
JP 2000-221546 A Japanese Patent Application Laid-Open No. 5-101884 JP 2005-114820 A JP 2005-114822 A

  The present invention is intended to solve such problems of the prior art, and can be manufactured with a roll-to-roll processing facility, has high productivity, and has a (quick) portion at the time of sealing. An object of the present invention is to provide a microcapsule type electrophoretic display (commonly called paper-like electronic display) and a protective film for an inorganic EL display (protective film and sealing film on the surface of the display) that are effective against bending. To do.

  The present invention has been made to solve the above-described problems. The invention according to claim 1 of the present invention includes at least a functional layer (1), a first adhesive layer (2), and a water vapor barrier layer (3). ) Is a protective film for an optical display body comprising a laminate (A) sequentially laminated, wherein the ratio of the thickness of the first adhesive layer (2) to the total thickness of the laminate (A) is 1 to 16%. And a layered product (A) laminated within a range where the ratio of the thickness of the water vapor barrier layer (3) to the thickness of the functional layer (1) is 6 to 30%. It is a protective film for optical displays.

  According to the second aspect of the present invention, at least the functional layer (1), the first adhesive layer (2), the water vapor barrier layer (3), the second adhesive layer (4), and the resin layer (5) are sequentially laminated. A protective film for an optical display body comprising a laminate (A), wherein the ratio of the total thickness of the first adhesive layer (2) and the second adhesive layer (4) to the total thickness of the laminate (A) is 1. It was laminated within a range of ˜16% and a ratio of the total thickness of the water vapor barrier layer (3) and the resin layer (5) to the thickness of the functional layer (1) was within a range of 6-30%. It is a protective film for optical display bodies which consists of a laminated body (A).

  According to a third aspect of the present invention, in the protective film for an optical display according to the first or second aspect, each of the first adhesive layer (2) and the second adhesive layer (4) has a thickness of 5 to 5. It is a protective film for optical display bodies characterized by being in the range of 20 μm.

  The protective film for an optical display according to the present invention is an optical display protective film comprising a laminate in which at least a functional layer, a first adhesive layer, and a water vapor barrier layer are sequentially laminated, and the protective film for the total thickness of the laminate. A laminate in which the ratio of the thickness of the first adhesive layer is in the range of 1 to 16% and the ratio of the thickness of the water vapor barrier layer to the thickness of the functional layer is in the range of 6 to 30% In addition, since the thickness of the first adhesive layer is in the range of 5 to 20 μm, it can be manufactured with a roll-to-roll processing facility, has high productivity, and is sealed ( It is also effective for bending the wrinkle).

  Embodiments of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a side sectional view showing one embodiment of the layer structure of a laminate (A) of a protective film for an optical display according to the present invention, and FIG. 2 is a laminate of the protective film for an optical display according to the present invention. It is a sectional side view which shows the other Example of the layer structure of (A).

  As shown in FIG. 1, the protective film for an optical display according to one embodiment of the present invention is a laminate in which at least a functional layer (1), a first adhesive layer (2), and a water vapor barrier layer (3) are sequentially laminated. A protective film for an optical display body comprising the body (A), wherein the ratio of the thickness of the first adhesive layer (2) to the total thickness of the laminate (A) is in the range of 1 to 16%, and It consists of a laminated body (A) laminated | stacked in the range whose thickness ratio of the said water vapor | steam barrier layer (3) with respect to the thickness of the said functional layer (1) is 6 to 30%.

  Further, as shown in FIG. 2, the protective film for an optical display body according to another embodiment of the present invention includes at least a functional layer (1), a first adhesive layer (2), a water vapor barrier layer (3), a first A protective film for an optical display body comprising a laminate (A) in which two adhesive layers (4) and a resin layer (5) are sequentially laminated, wherein the first adhesive layer (2) with respect to the total thickness of the laminate (A) ) And the second adhesive layer (4) within a range of 1 to 16%, and the water vapor barrier layer (3) and the resin layer (5) with respect to the thickness of the functional layer (1). It consists of a laminated body (A) laminated | stacked within the range whose ratio of total thickness is 6 to 30%.

  Furthermore, each thickness of the said 1st contact bonding layer (2) and the 2nd contact bonding layer (4) exists in the range of 5-20 micrometers.

  The present invention makes it possible to manufacture the protective film with a roll-to-roll processing facility, to improve productivity, and to be effective for bending at the time of sealing. It aims at providing a protective film (a protective film and a sealing film on the surface of a display body) of a formula display body (commonly called paper-like electronic display) and an inorganic EL display body.

  Therefore, as shown in FIG. 1, the protective film for an optical display body according to one embodiment of the present invention is formed by sequentially laminating at least a functional layer (1), a first adhesive layer (2), and a water vapor barrier layer (3). It is a laminated body (A). Moreover, you may laminate | stack a heat bonding layer (6) as needed.

  The protective film for an optical display according to the present invention is applicable to surface protection and sealing of a microcapsule-type electrophoretic display (commonly called paper-type electronic display) and an inorganic EL display.

  When manufacturing such a protective film for an optical display, it is preferable to manufacture using a roll-to-roll processing facility because it can be manufactured at low cost. However, as described above, of course, it is essential that the laminate passes through a roll. For example, as shown in FIG. 4, in the case of the conventional roll (13) arrangement that turns 360 degrees, when the laminate (B) passes the roll (13), as shown in FIG. When the difference in curvature between the functional layer (10) and the inner water vapor barrier layer (12) occurs, and the adhesive layer (11) is thick, the inner portion (14) is left and wrinkles are generated due to the difference. is there.

  As a solution to this, as shown in FIG. 1, the protective film for an optical display body showing one embodiment according to the present invention includes at least a functional layer (1), a first adhesive layer (2), and a water vapor barrier layer (3). In the laminate (A) in which the layers are sequentially laminated, the ratio of the thickness of the first adhesive layer (2) to the total thickness of the laminate (A) is in the range of 1 to 16%, and the functional layer (1 The ratio of the thickness of the water vapor barrier layer (3) to the thickness of (3) is preferably set within a range of 6 to 30% and laminated.

  Similarly, as shown in FIG. 2, the protective film for an optical display body according to another embodiment of the present invention includes at least a functional layer (1), a first adhesive layer (2), a water vapor barrier layer (3), In the laminate (A) in which the second adhesive layer (4) and the resin layer (5) are sequentially laminated, the first adhesive layer (2) and the second adhesive layer (4) with respect to the total thickness of the laminate (A). And the ratio of the total thickness of the water vapor barrier layer (3) and the resin layer (5) to the thickness of the functional layer (1) is in the range of 1 to 16%. It is preferable to set and laminate within the range.

  Furthermore, if each of the first adhesive layer (2) and the second adhesive layer (4) is too thick, a difference in curvature between the outer functional layer (1) and the inner water vapor barrier layer (3) occurs, Since wrinkles may occur due to the difference, in the present invention, the thickness of each of the first adhesive layer (2) and the second adhesive layer (4) is set within a range of 5 to 20 μm. preferable. If the film thickness is less than 5 μm, the adhesive strength is insufficient, and lamination cannot be performed. If the film thickness exceeds 20 μm, problems such as wrinkles occur as described above.

  As described above, by limiting the adhesive layer / laminate total thickness ratio, the functional layer / water vapor barrier layer ratio, and the absolute thickness of the adhesive layer, it becomes possible to manufacture with roll-to-roll processing equipment. A microcapsule-type electrophoretic display (commonly known as a paper-type electronic display) and an inorganic EL display protective film (display) that are highly productive and effective against bending at the time of sealing. Surface protective film and sealing film) can be provided.

  Next, materials, roles, production methods and the like constituting the protective film for an optical display according to the present invention will be described in detail.

  First, the functional layer (1) has functions such as an ultraviolet (UV) cut film, an antiglare film, an antireflection film, and a hard coat, and the ultraviolet (UV) cut film is formed on the substrate film surface ( It is prepared by applying a UV-cutting agent to (not shown) or mixing at the stage of the resin before forming the base film. Next, the antiglare film is a film having irregularities on the surface and scattering external light on the irregular surface. The antireflection film attenuates reflected light by utilizing interference of reflected light generated at the interface between the laminated films. The hard coat is a hard resin film having a high cross-linking density and has scratch resistance similar to that of glass. These functional layers can be formed by a known method using a known material.

  By the way, as a base film in producing the functional layer (1), for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT). ), Polyester such as polypropylene (PP) and polystyrene (PS), polyamide (PA) such as nylon-6 and nylon-66, polycarbonate (PC), polyacrylonitrile (PAN), polyimide (PI), etc. Although a stretched or stretched film can be used, among these various films, a biaxially stretched polyethylene terephthalate film (OPET) arbitrarily stretched in the biaxial direction is used from the viewpoints of strength, processability, cost, and the like. Is preferableMoreover, it is preferable that the thickness of this base film exists in the range of 25-250 micrometers.

  Next, as the water vapor barrier layer (3), for example, a polyethylene terephthalate film (PET), a polyamide film (PA), a polycarbonate film (PC), a polyvinylidene chloride film (PVDC), a polyvinyl alcohol film (PVA), ethylene -Vinyl alcohol copolymer film (EVOH), aluminum foil, resin film having a deposited thin film of aluminum or an inorganic oxide (such as silicon oxide or aluminum oxide), a film such as a saponified ethylene-vinyl acetate copolymer, or polyethylene A film obtained by coating polyvinylidene chloride (PVDC) on a film such as a terephthalate film (PET), a polyamide film (PA), a polyvinyl alcohol film, a saponified ethylene-vinyl acetate copolymer, or In addition, a laminated body in which one or more of these films are combined can be used. In the present invention, a vapor-deposited thin film of an inorganic oxide such as aluminum oxide or silicon oxide is provided on one side of a support film (not shown). It is preferable to use a barrier layer made of a deposited film provided with a layer (not shown).

  The support film is not particularly limited, but a single film and various laminated films can be used in consideration of processability and the like.

  For example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyolefins such as polypropylene (PP) and polystyrene (PS), nylon- 6, unstretched or stretched film such as polyamide (PA) such as nylon-66, polycarbonate (PC), polyacrylonitrile (PAN), polyimide (PI) can be used. Among these various films, strength, From the viewpoint of processability and cost, it is preferable to use a biaxially stretched polyethylene terephthalate film (OPET) arbitrarily stretched in the biaxial direction. Moreover, it is preferable that the thickness of this support body film exists in the range of 10-25 micrometers.

As the inorganic oxide for forming the vapor-deposited thin film layer, a metal oxide can be basically used. For example, aluminum, silicon, magnesium, calcium, potassium, tin, sodium, boron, titanium, Examples thereof include oxides such as lead, zirconium, yttrium, and mixtures thereof.

  In general, it is preferable to use aluminum oxide or silicon oxide in view of transparency, physical properties, and productivity.

  As a method of forming such an inorganic oxide vapor-deposited thin film layer, a vacuum vapor deposition method, a sputtering method, or the like can be used, but a vacuum vapor deposition method is preferable in consideration of productivity, production cost, and the like.

  Although the thickness of this vapor deposition thin film layer is suitably selected by the kind and structure of the inorganic oxide used, it is preferable to exist in the range of 5-300 nm. If the film thickness of the deposited thin film layer is less than 5 nm, a uniform film cannot be provided. Therefore, sufficient water vapor barrier property and oxygen gas barrier property cannot be obtained. It is not preferable because cracks and peeling easily occur in the deposited thin film layer due to external factors such as the above.

  In addition, a heat crosslinkable primer coat layer (not shown) may be provided between the support film and the deposited thin film layer to further improve the adhesion between the support film and the deposited thin film layer. Is possible.

Examples of the thermally crosslinkable primer coat layer include, for example, a general formula M (OR) n (wherein M: a metal element such as Si, Zr, Ti, and Al, and an alkyl group such as R: CH ₃ and C ₂ H _5. , N: oxidation number of metal element) or a hydrolyzate of the metal alkoxide, or a general formula, R′Si (OR) ₃ (R ′: alkyl group, vinyl group, epoxy group, glycid A composite of at least one of a trifunctional organosilane represented by R: an alkyl group or the like or a hydrolyzate of the organosilane with a polyol compound and an isocyanate compound can also be used. .

Or a trifunctional organosilane represented by a general formula, R′Si (OR) ₃ (wherein R ′: amino group, isocyanate group, sulfoxide group, etc., R: alkyl group, etc.), a polyol compound, and an isocyanate. It may be composed of a compound with a compound.

Next, the metal alkoxide has a general formula, M (OR) n (wherein M: a metal element such as Si, Zr, Ti, Al, R: an alkyl group such as CH ₃ or C ₂ H ₅ , n: For example, an alkoxysilane compound, a zirconium alkoxide compound, a titanium alkoxide compound, or the like can be used.

  The thickness of the heat-crosslinkable primer coat layer is not particularly limited as long as a uniform coating film can be formed, but the dry film thickness is preferably in the range of 5 to 300 nm. If the thickness is less than 5 nm, uniform coating cannot be formed, and stable adhesion cannot be obtained. If the thickness exceeds 300 nm, the physical properties are balanced, which is not economical.

  Next, as a method for forming the thermally crosslinkable primer coat layer, for example, a known gravure roll coating method, reverse roll coating method, air knife coating method, bar coating method, or the like can be used.

  In order to further improve the adhesion, the surface of the support film is pretreated by a known method such as corona discharge treatment, glow discharge treatment, low temperature plasma treatment, flame treatment, chemical treatment, solvent treatment, etc. There is also. In addition, various known additives and stabilizers such as antistatic agents, ultraviolet absorbers, plasticizers, and lubricants can be used on the front and back surfaces of the support film.

  Next, in order to further improve the gas barrier property of the water vapor barrier layer (3), a gas barrier coating layer (not shown) may be laminated on the inorganic oxide vapor-deposited thin film layer.

  The gas barrier coating layer is provided on the vapor deposition thin film layer in order to prevent various secondary damages in the post-process of the vapor deposition thin film layer and to impart higher gas barrier properties. The component includes a coating agent mainly comprising an aqueous solution or a water / alcohol mixed solution containing at least one of a water-soluble polymer and (a) one or more metal alkoxides and hydrolysates thereof, or (b) tin chloride. The gas barrier coating layer is formed by coating on the deposited thin film layer.

  The gas barrier coating layer is formed on the deposited thin film layer by applying a known method such as a gravure roll coating method, a reverse roll coating method, an air knife coating method or a bar coating method, followed by heating and drying. The

  In this case, the thickness of the gas barrier coating layer is preferably in the range of 0.01 to 50 μm after drying. If the thickness after drying is less than 0.01 μm, sufficient gas barrier properties cannot be obtained, and if it exceeds 50 μm, the coating film tends to crack and adversely affects the gas barrier.

  As described above, the water vapor barrier layer (3) which is one of the layer structures constituting the protective film for an optical display according to the present invention is the above-mentioned support film / primer layer / deposited thin film layer of inorganic oxide / Gas barrier coating layer, or support film / inorganic oxide deposited thin film layer / gas barrier coating layer, further support film / inorganic oxide deposited thin film layer / gas barrier coating layer / inorganic oxide deposited thin film layer, etc. You may use the vapor deposition film which consists of these layer structures.

  Next, as an adhesive used for the first adhesive layer (2) and the second adhesive layer (4) shown in FIG. 1 and FIG. 2 of the layer configuration constituting the protective film for an optical display according to the present invention. Known adhesives for dry lamination, for example, polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, and other laminating adhesives can be used.

  A method of sequentially laminating the functional layer (1) and the water vapor barrier layer (3) in the case of the layer configuration as shown in FIG. 1, or the functional layer (1) in the case of the layer configuration as shown in FIG. The method of laminating the water vapor barrier layer (3) and the resin layer (5) in order is, for example, a sandwich / extrusion lamination method using a dry lamination method, a non-solvent dry lamination method, a hot melt lamination method, or an extrusion lamination method. Known methods such as the above can be used as appropriate, but in view of adhesive strength, workability, etc., the dry lamination method using the laminating adhesive described above is preferable.

  In addition, you may use well-known adhesive adhesives called a pressure sensitive adhesive and a heat sensitive adhesive, such as a rubber type, an acrylic type, and a silicone type. These may use the dry lamination method described above, or may be used in the form of a single-sided adhesive tape or a double-sided adhesive tape having a release paper on the adhesive surface.

  In addition, it is preferable to make each thickness of this 1st contact bonding layer (2) and 2nd contact bonding layer (4) into the range of 5-20 micrometers. If the film thickness is less than 5 μm, the adhesive strength is insufficient, and lamination cannot be performed. If the film thickness exceeds 20 μm, problems such as wrinkles occur as described above.

  Next, as shown in FIG. 2, the protective film for an optical display body according to another embodiment of the present invention includes at least a functional layer (1), a first adhesive layer (2), a water vapor barrier layer (3), Although it is a protective film for optical display bodies which consists of a laminated body (A) which laminated | stacked the 2nd contact bonding layer (4) and the resin layer (5) sequentially, the said resin layer (5) is the intensity | strength of the said laminated body (A). As long as the physical properties such as the surface are improved, the film is not particularly limited, but a single film and various laminated films can be used in consideration of processability and the like.

  For example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyolefins such as polypropylene (PP) and polystyrene (PS), nylon- 6, unstretched or stretched films such as polyamide (PA) such as nylon-66, polycarbonate (PC), polyacrylonitrile (PAN), polyimide (PI) can be used. Among these various films, strength, From the viewpoint of processability and cost, it is preferable to use a biaxially stretched polyethylene terephthalate film (OPET) arbitrarily stretched in the biaxial direction. Moreover, it is preferable that the thickness of this resin layer (5) exists in the range of 10-25 micrometers.

  Next, the protective film for an optical display according to the present invention can be adhered to the optical display by laminating a thermal adhesive layer (6) as necessary. Examples of the thermal adhesive layer (6) include low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), linear low density polyethylene resin (L-LDPE), and polypropylene. Resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methacrylic acid ester Hot made of resin such as copolymer, ethylene-acrylic acid ester copolymer, ionomer resin, ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, etc. A melt adhesive can be used.

  Specific examples of the protective film for an optical display according to the present invention will be described below in more detail, but the present invention is not limited thereto.

<Example 1>
As shown in FIG. 1, a biaxially stretched polyethylene terephthalate film having a thickness of 188 μm is used for the functional layer (1), and a biaxially stretched polyethylene terephthalate deposited film having a thickness of 12 μm is used for the water vapor barrier layer (3). And laminating through a first adhesive layer (2) having a thickness of 11 μm made of an acrylic adhesive and biaxially stretched polyethylene terephthalate film 188 μm (functional layer) / acrylic adhesive 11 μm (first The protective film for optical display bodies which concerns on this invention which consists of a laminated body (A) of adhesive layer) / deposited film 12micrometer (water vapor | steam barrier layer) was produced. Ratio of thickness of first adhesive layer to total thickness of laminated body at that time (%) = 11 / (188 + 11 + 12) = 5.2%, ratio of thickness of water vapor barrier layer to thickness of functional layer = 12 / 188 = 6.4%.

<Example 2>
As shown in FIG. 2, a biaxially stretched polyethylene terephthalate film having a thickness of 188 μm is used for the functional layer (1), and a biaxially stretched polyethylene terephthalate deposited film having a thickness of 12 μm is used for the water vapor barrier layer (3). And laminating through the first adhesive layer (2) having a thickness of 11 μm made of an acrylic pressure-sensitive adhesive, followed by the second adhesive layer (4) having a thickness of 11 μm made of an acrylic pressure-sensitive adhesive. Then, a resin layer (5) made of biaxially stretched polyethylene terephthalate having a thickness of 12 μm is sequentially laminated, and biaxially stretched polyethylene terephthalate film 188 μm (functional layer) / acrylic adhesive 11 μm (first adhesive layer) / Deposition film 12 μm (water vapor barrier layer) / acrylic adhesive 11 μm (second adhesive layer) / biaxially stretched polyethylene terephthal To produce an optical display-body protective film according to the present invention comprising a laminate of over Tofirumu 12 [mu] m (resin layer) (A). Ratio of thickness of first adhesive layer + second adhesive layer to total thickness of laminated body at that time (%) = 11 + 11 / (188 + 11 + 12 + 11 + 12) = 9.4%, water vapor barrier layer + resin layer with respect to functional layer thickness The thickness ratio was 12 + 12/188 = 12.8%.

<Example 3>
In Example 1, a biaxially stretched polyethylene terephthalate film 50 μm (functional layer) / acrylic adhesive was used in the same manner as in Example 1 except that a 50 μm thick biaxially stretched polyethylene terephthalate film was used for the functional layer (1). The protective film for optical display bodies which concerns on this invention which consists of a laminated body (A) of adhesive agent 11micrometer (1st adhesive layer) / vapor deposition film 12micrometer (water vapor | steam barrier layer) was produced. Ratio of thickness of first adhesive layer to total thickness of laminated body at that time (%) = 11 / (50 + 11 + 12) = 15.1%, ratio of thickness of water vapor barrier layer to thickness of functional layer = 12 / 50 = 24%.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
In Example 1, a biaxially stretched polyethylene terephthalate film 188 μm (functional layer) / acrylic was used in the same manner as in Example 1 except that a 50 μm thick acrylic adhesive was used for the first adhesive layer (2). The protective film for optical display bodies which concerns on this invention which consists of a laminated body (A) of adhesive adhesive 50micrometer (1st adhesive layer) / vapor deposition film 12micrometer (water vapor | steam barrier layer) was produced. Ratio of thickness of first adhesive layer to total thickness of laminated body at that time (%) = 50 / (188 + 50 + 12) = 20.0%, ratio of thickness of water vapor barrier layer to thickness of functional layer = 12 / 188 = 6.4%.

<Comparative example 2>
In Example 1, a biaxially stretched polyethylene terephthalate film having a thickness of 38 μm was used for the functional layer (1), and an acrylic adhesive adhesive having a thickness of 9 μm was used for the first adhesive layer (2). In the same manner as in Example 1, the present invention comprises a laminate (A) of a biaxially stretched polyethylene terephthalate film 38 μm (functional layer) / acrylic adhesive adhesive 9 μm (first adhesive layer) / deposited film 12 μm (water vapor barrier layer). The protective film for optical display bodies which concerns on this was produced. Ratio of thickness of first adhesive layer to total thickness of laminated body at that time (%) = 9 / (38 + 9 + 12) = 15.2%, ratio of thickness of water vapor barrier layer to thickness of functional layer = 12 / 38 = 31.5%.

<Evaluation>
Using the protective films for optical display bodies produced in Examples 1 to 3 and Comparative Examples 1 and 2, a bending test was performed in which the state was observed by wrapping around a φ80 mm roll. In addition, as for the direction of winding, two kinds of tests were performed, in which the winding was performed with the PET (functional layer) on the outer side and the inner side on the contrary to the thickness direction of the laminate. The results were evaluated as good: good and bad: x. The results are shown in Table 1.

表１は、実施例１〜３および比較例１〜２で作製した、光学表示体用保護フィルムを用いて、折り曲げテストの結果を示した表である。

Table 1 is a table showing the results of the bending test using the protective films for optical display bodies produced in Examples 1 to 3 and Comparative Examples 1 and 2.

<Evaluation results>
From Table 1, Examples 1 to 3 were all good without wrinkles. In Comparative Example 1, the absolute value of the thickness of the first adhesive layer is high, and the ratio (%) of the thickness of the first adhesive layer to the total thickness of the laminate is also high. Wrinkles occurred when wound. In Comparative Example 2, since the ratio of the thickness of the water vapor barrier layer to the thickness of the functional layer was high, wrinkles and the like were generated when the PET (functional layer) was wound outside.

It is a sectional side view which shows one Example of the laminated constitution of the laminated body of the protective film for optical display bodies which concerns on this invention. It is a sectional side view which shows the other Example of the layer structure of the laminated body of the protective film for optical display bodies which concerns on this invention. It is a sectional side view which shows one Example of the laminated constitution of the laminated body of the conventional protective film for optical display bodies. It is a sectional side view which shows 360 degree | times folding roll arrangement | positioning of the conventional roll to roll processing machine. It is a partial expanded side sectional view which shows the state which wound the laminated body on the roll of the conventional roll to roll processing machine. It is a sectional side view which shows the state which coat | covered the conventional optical display body with the protective film (sealing film). It is a sectional side view which shows the state which coat | covered the conventional optical display body with the protective film (sealing film).

Explanation of symbols

A ... laminate B ... laminate C ... sealing film (protective film)
DESCRIPTION OF SYMBOLS 1 ... Functional layer 2 ... 1st contact bonding layer 3 ... Water vapor | steam barrier layer 4 ... 2nd contact bonding layer 5 ... Resin layer 6 ... Thermal contact bonding layer 10 ... Functional layer 11. ..Adhesive layer 12 ... Water vapor barrier layer 13 ... Roll 14 ... Inner portion 20 ... Transparent resin layer 21 ... Transparent electrode layer 22 ... Light emitting layer or display layer 23 ... Dielectric Body layer 24... Lower electrode layer 25... Terminal metal or lead 26.

Claims (3)

  A protective film for an optical display body comprising a laminate in which at least a functional layer, a first adhesive layer, and a water vapor barrier layer are sequentially laminated, wherein the ratio of the thickness of the first adhesive layer to the total thickness of the laminate is 1 to An optical display protection device comprising a laminate laminated in a range of 16% and a ratio of the thickness of the water vapor barrier layer to the thickness of the functional layer in a range of 6 to 30%. the film.   A protective film for an optical display body comprising a laminate in which at least a functional layer, a first adhesive layer, a water vapor barrier layer, a second adhesive layer, and a resin layer are sequentially laminated, wherein the first adhesive layer with respect to the total thickness of the laminate And the ratio of the total thickness of the second adhesive layer is in the range of 1 to 16%, and the ratio of the total thickness of the water vapor barrier layer and the resin layer to the thickness of the functional layer is in the range of 6 to 30%. A protective film for an optical display body, comprising a laminated body laminated.   3. The protective film for an optical display according to claim 1, wherein each of the first adhesive layer and the second adhesive layer has a thickness in the range of 5 to 20 μm.

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