KR20180011804A - Adhesive-film manufacturing method and polarizer manufacturing method - Google Patents

Abstract

There is provided a process for producing an adhesive film which is preferably used as a surface protective film for selectively processing a predetermined portion of an object and a process for producing a polarizer using such an adhesive film. The method for producing an adhesive film of the present invention is a method for producing a pressure sensitive adhesive film in which a pressure sensitive adhesive layer 12 formed on one surface of a resin substrate 11 and a resin substrate 11 and a separator 13 temporarily attached to the pressure sensitive adhesive surface of the pressure sensitive adhesive layer 12 The pressure-sensitive adhesive layer 12 and the resin base material 11 are cut off from the side of the separator 13 of the laminate 10, Lt; / RTI >

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate,

The present invention relates to a process for producing an adhesive film and a process for producing a polarizer. More specifically, the present invention relates to a process for producing a pressure-sensitive adhesive film having through-holes and a method for producing a polarizer having a light-blocking portion using the pressure-sensitive adhesive film.

The pressure-sensitive adhesive film is used in a wide range of applications because it has excellent processability and can give various kinds of properties. For example, there is a demand for use as a surface protective film when selectively treating a predetermined portion of an object.

[0004] Incidentally, some image display apparatuses such as cellular phones and notebook personal computers (PCs) have internal electronic components such as cameras mounted thereon. For the purpose of improving the camera performance and the like of such an image display apparatus, various studies have been made (for example, Patent Documents 1 to 6). However, due to the rapid spread of smart phones and touch panel type information processing devices, further improvement in camera performance and the like is demanded. In addition, in order to cope with the diversification and high functionality of the image display apparatus, a polarizing plate having a partial polarization performance is required.

Japanese Laid-Open Patent Publication No. 2011-81315 Japanese Patent Application Laid-Open No. 2007-241314 U.S. Patent Application Publication No. 2004/0212555 Japanese Laid-Open Patent Publication No. 2012-137738 Korean Patent Laid-Open No. 10-2012-0118205 U.S. Patent Application Publication No. 2014/0118826

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and its main object is to provide an adhesive film which is preferably used as a surface protective film for selectively treating a predetermined portion of an object (for example, a polarizer) It is on. Another object of the present invention is to provide a polarizer capable of realizing multifunctional and highly functional electronic devices such as image display devices.

The method for producing an adhesive film of the present invention is a method for producing a pressure-sensitive adhesive film, which comprises preparing a laminate having a resin substrate, a pressure-sensitive adhesive layer formed on one surface of the resin substrate, and a separator temporarily mounted on an adhesive surface of the pressure- And separating from the side of the separator to form a through hole integrally passing through the separator, the pressure-sensitive adhesive layer, and the resin base material.

In one embodiment, the through hole is formed in a state in which the abutting member is placed on the resin substrate side of the laminate.

In one embodiment, the through hole is formed by being cut from the surface of the separator in the middle of the facing material.

In one embodiment, the abutting member is bonded to the laminate with an adhesive.

In one embodiment, the method for producing an adhesive film further comprises peeling off the abutting member from the laminate.

In one embodiment, the formation of the through-holes is performed by cutting with a cutting edge.

In one embodiment, the formation of the through-holes is performed by laser light irradiation.

According to another aspect of the present invention, a method for producing a film is provided. In this method, a pressure-sensitive adhesive film obtained by the above production method is applied to a film, and a portion corresponding to the through-hole of the film is selectively treated.

According to yet another aspect of the present invention, a method of manufacturing a polarizer is provided. This polarizer is produced by peeling the separator from the pressure-sensitive adhesive film obtained by the above-mentioned production method, and adhering a pressure-sensitive adhesive film obtained by peeling the separator to a resin film containing a dichroic substance, And forming a non-light-emitting portion at a portion corresponding to the through hole of the light-emitting portion.

In one embodiment, the pressure-sensitive adhesive film from which the separator is peeled has a resin base material and a pressure-sensitive adhesive layer formed on one surface of the resin base material, the through-hole penetrating the resin base material and the pressure- And the peripheral edge of the through-hole side of the pressure-sensitive adhesive layer side is formed on the circular arc surface.

In one embodiment, the method for producing a polarizer further comprises peeling off the adhesive film from the resin film containing the dichroic substance after forming the light-blocking portion.

In one embodiment, a basic solution is contacted with the resin film containing the dichroic substance to form the non-light-emitting portion.

In one embodiment, the basic solution comprises a hydroxide of an alkali metal and / or an alkaline earth metal.

In one embodiment, the method for producing a polarizer further includes reducing an alkali metal and / or an alkaline earth metal contained in the resin film at a contact portion with the basic solution.

In one embodiment, the alkali metal and / or alkaline earth metal is reduced while the adhesive film is stuck to the resin film containing the dichroic substance.

According to one embodiment of the present invention, it is possible to provide an adhesive film which is preferably used as a surface protective film for selectively processing a predetermined portion of an object (for example, a polarizer). By using such a pressure-sensitive adhesive film, the non-light-emitting portion having a desired shape can be formed well. The polarizer obtained by the present invention can realize multifunctional and high-functionalization of an electronic device, and is preferably used for an electronic device. The polarizer obtained by the present invention is suitable not only for an electronic device such as a video or a monitor but also for a transmission type electronic device such as an LED light or an infrared ray sensor and an image display device for securing transparency and straightness of light to the naked eye Can be used.

1 is a cross-sectional view of a laminate according to one embodiment of the present invention.
2 is a plan view of a polarizer according to one embodiment of the present invention.
3 is a cross-sectional view of a polarizing film laminate according to one embodiment of the present invention.
Fig. 4 (a) is a photograph of a state in which the pressure-sensitive adhesive film of the embodiment is attached to a polarizer, and Fig. 4 (b) is a photograph of a state in which a pressure-

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

The method for producing an adhesive film according to the present invention comprises the steps of: preparing a laminate having a resin substrate, a pressure-sensitive adhesive layer formed on one surface of the resin substrate, and a separator temporarily mounted on an adhesive surface of the pressure- To form a through hole.

A. Laminate

1 is a sectional view of a laminate according to one embodiment of the present invention. The laminate 10 has a resin substrate 11, a pressure-sensitive adhesive layer 12 formed on one surface of the resin substrate 11 and a separator 13 temporarily mounted on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer 12 . The laminate is, for example, a long laminate. As used herein, the term " elongated phase " means a long elongated shape having a sufficiently long length with respect to its width, and includes a elongated elongated shape having a length of 10 times or more, preferably 20 times or more . In this case, the laminate can be wound in a roll form.

The resin substrate can function as a substrate of the resulting pressure-sensitive adhesive film. The resin substrate is preferably a film having high hardness (e.g., elastic modulus). The deformation of the through hole can be prevented. More specifically, deformation of the through-hole can be prevented even when a tension is applied when using the obtained pressure-sensitive adhesive film (for example, when transporting and / or coalescing).

Examples of the material for forming the resin base material include an ester based resin such as a polyethylene terephthalate based resin, a cycloolefin based resin such as a norbornene based resin, an olefin based resin such as polypropylene, a polyamide based resin, a polycarbonate based resin And copolymer resins. Preferably, it is an ester-based resin (particularly, a polyethylene terephthalate-based resin). Such a material is advantageous in that the modulus of elasticity is sufficiently high and deformation of the through-hole is difficult to occur.

The thickness of the resin substrate is typically 20 to 250 占 퐉, preferably 30 to 150 占 퐉. With such a thickness, there is an advantage that deformation of the through hole is less likely to occur.

The elastic modulus of the resin base material is preferably 2.2 kN / mm < 2 > to 4.8 kN / mm < 2 >. When the modulus of elasticity of the resin base material is in this range, there is an advantage that deformation of the through hole is less likely to occur. The elastic modulus is measured in accordance with JIS K 6781.

The tensile elongation of the resin substrate is preferably 90% to 170%. If the tensile elongation of the resin base material is in this range, it has an advantage that it is hard to break during transportation, for example. The tensile elongation is measured in accordance with JIS K 6781.

The pressure-sensitive adhesive layer may be formed of any suitable pressure-sensitive adhesive as long as the effect of the present invention can be obtained. Examples of the base resin of the pressure-sensitive adhesive include acrylic resin, styrene resin, and silicone resin. Acrylic resin is preferable from the viewpoints of the chemical resistance of the obtained pressure-sensitive adhesive film, the adhesiveness with an adherend (for example, adhesiveness for preventing intrusion of a treatment liquid at the time of immersion), degree of freedom for an adherend and the like. Examples of the crosslinking agent that can be contained in the pressure-sensitive adhesive include an isocyanate compound, an epoxy compound and an aziridine compound. The pressure-sensitive adhesive may contain, for example, a silane coupling agent. The compounding formulation of the pressure-sensitive adhesive may be suitably set according to the purpose.

The pressure-sensitive adhesive layer can be formed by any suitable method. Specific examples include a method of applying a pressure-sensitive adhesive solution onto a resin substrate and drying, or a method of previously laminating a pressure-sensitive adhesive layer formed on a separator to a resin substrate. Examples of the coating method include a roll coating method such as reverse coating and gravure coating, a spin coating method, a screen coating method, a fountain coating method, a dipping method and a spraying method.

The thickness of the pressure-sensitive adhesive layer is preferably 1 占 퐉 to 60 占 퐉, more preferably 3 占 퐉 to 30 占 퐉. If the thickness is too thin, the tackiness becomes insufficient, and air bubbles may enter the adhesive interface. If the thickness is excessively large, problems such as the pressure-sensitive adhesive being discharged are likely to occur.

The separator can function as a protective material for protecting the pressure-sensitive adhesive layer (pressure-sensitive adhesive film) until it is provided for practical use. By using a separator, the pressure-sensitive adhesive film can be wound in a roll-like state. Examples of the separator include plastic (for example, polyethylene terephthalate (PET), polyethylene, and polypropylene) films that have been surface-coated with a releasing agent such as a silicon based releasing agent, a fluorine based releasing agent and a long chain alkyl acrylate based releasing agent, Or paper. The thickness of the separator may be set to any suitable thickness depending on the purpose. The thickness of the separator is, for example, 10 mu m to 100 mu m.

The laminate may be produced by any suitable method. Specifically, it may be produced by laminating a separator on a pressure-sensitive adhesive layer formed on a resin substrate, or by laminating a resin substrate on a pressure-sensitive adhesive layer formed on the separator.

B. Formation of through-hole

Next, a through hole is formed in the laminate. Specifically, the laminate is cut by any appropriate cutting method to form a through-hole that integrally passes through the resin base material, the pressure-sensitive adhesive layer, and the separator. As the cutting method, for example, a method of mechanically cutting using a cutting blade (tapping type) such as a Thomson blade, a pinnacle blade or the like, a water jet, and a method of cutting by irradiating with a laser beam.

For example, when a plurality of through holes are formed in the laminate, the cutting by the cutting edge can be preferably employed. The cutting by the cutting edge can be carried out in any suitable manner. For example, it may be performed using a punching device in which a plurality of cutting blades are arranged in a predetermined pattern, or the cutting blade may be moved by using an apparatus such as an XY plotter. In this manner, since the cutting blade can be moved and cut corresponding to the predetermined position of the laminate, the through hole can be formed at a desired position of the laminate with high accuracy. In one embodiment, the cutting by the cutting blade can be carried out while appropriately interlocking with the conveying while roll-conveying the elongated-layer laminate. More specifically, the through hole can be formed at a desired position of the laminate by suitably adjusting the timing of cutting and / or the moving speed of the cutting edge in consideration of the conveying speed of the laminate. Further, the punching device may be a reciprocating type (tapping flat type) or a rotary type (rotating type).

Any appropriate laser may be employed with the laser as long as it can cut the laminate. Preferably, a laser capable of emitting light having a wavelength in the range of 193 nm to 10.6 μm is used. Specific examples include gas lasers such as CO ₂ lasers and excimer lasers; Solid state lasers such as YAG lasers; Semiconductor lasers. Preferably, a CO ₂ laser is used.

The irradiation condition of the laser light can be set to any suitable condition, for example, according to the laser used. The output condition is, for example, 0.1 W to 250 W when a CO ₂ laser is used.

When cutting the laminate, it is preferable to put the abutting material on one side of the laminate. More specifically, the abutting member is applied to the surface of the laminate at the end of the cutting direction. By using the abutting material, when the abutting material is peeled from the laminate after the cutting, the perforation residue can be removed at the same time. Specifically, the abutting member can be peeled off from the laminate in the state that the perforated debris is attached to the abutting member. Further, by using the abutting material, deformation of the laminate due to cutting can be suppressed. For example, when cutting with a cutting blade, deformation of the pressure-sensitive adhesive layer can be suppressed in particular.

In a preferred embodiment, the through-hole is formed by cutting from the surface of the laminate to the middle of the abutting member. According to such a configuration, the resin base material, the pressure-sensitive adhesive layer, and the through hole integrally passing through the separator can be satisfactorily formed. In addition, when the abutting material is peeled from the laminate, the perforated debris can be satisfactorily removed.

As the abutting member, a polymer film is preferably used. As the polymer film, the same film as the resin base material may be used. Also, a soft (e.g., low modulus) film such as a polyolefin (e.g., polyethylene) film may be used. In one embodiment, a film having high hardness (e.g., elastic modulus) is preferably used as the polymer film. This is because deformation of the laminate due to cutting can be satisfactorily suppressed. The thickness of the polymer film is preferably 20 mu m to 100 mu m.

Preferably, the abutting material is bonded to the laminate with an adhesive. By adhering the abutting member to the laminate, problems such as displacement of the abutting member at the time of cutting can be prevented. In addition, when the abutting material is peeled from the laminate, the perforated debris can be satisfactorily removed. Any suitable pressure-sensitive adhesive may be used as the pressure-sensitive adhesive that bonds the abutting material so long as it has an adhesive force capable of releasing the abutting material from the laminate after cutting. In one embodiment, a pressure-sensitive adhesive layer is previously formed on the butt joint. The thickness of the pressure-sensitive adhesive layer formed on the abutting material is preferably 1 to 50 占 퐉.

In one embodiment, it is preferable that the shape of the abutting member is made to correspond to the shape of the laminate. For example, when the laminate is a lengthening phase, a long phase facing material is used. According to such a configuration, when the abutting member is peeled from the laminate, the punched debris can be satisfactorily removed. Further, when a plurality of through holes are formed in the laminate, the perforated debris can be continuously removed, and the productivity can be remarkably improved.

At the time of forming the through hole, the separator is cut off from the side of the separator. By cutting from the separator side, the influence on the adhesion of the pressure-sensitive adhesive film obtained by cutting can be suppressed. Specifically, when cutting with a cutting blade, the pressure-sensitive adhesive layer of the laminate can be deformed following the cutting edge. When the pressure-sensitive adhesive layer is cut from the resin substrate side, the pressure-sensitive adhesive layer is swollen on the side of the pressure-sensitive adhesive surface side of the obtained pressure-sensitive adhesive film, and a bulge is formed in the periphery of the through- As a result, when the resulting adhesive film is attached to an adherend, air bubbles may be generated around the through hole. On the other hand, when the film is cut from the separator side, the pressure sensitive adhesive layer may be deformed following the cutting edge, but the peripheral edge on the side of the adhesive surface of the through hole of the obtained pressure sensitive adhesive film may be in a smooth state (for example, The occurrence of bubbles can be prevented. Further, when the abutting member is used by cutting from the side of the separator, when the abutting member is separated from the laminate after the cutting, the perforation residue can be satisfactorily removed.

Any shape suitable for the shape of the through hole viewed from the plane of the through hole can be employed depending on the purpose. Specific examples include circular, elliptical, square, rectangular, and rhombic. In one embodiment, the shape viewed from the plane of the through-hole has a shape corresponding to the shape of the desired light-blocking portion in the production of a polarizer described below. Specifically, in the case of producing a polarizer (described later) of the illustrated example, the shape seen from the plane of the through hole becomes a small circular shape. By appropriately configuring the means for forming the through-holes, it is possible to form the through-holes having the shape seen from the desired plane. When a device such as a punching device or an XY plotter is used, a through-hole of a shape seen from a plane corresponding to the shape of the cutting edge (tang) can be formed.

C. Examples

The pressure-sensitive adhesive film of the present invention is preferably used, for example, as a surface protective film for selectively treating a predetermined portion of an object (typically, a film). Examples of the selective treatment include decoloring, coloring, punching, developing, etching, patterning (e.g., forming an active energy ray-curable resin layer), chemical denaturation, and heat treatment. Hereinafter, as a specific example, a method for producing a polarizer having a non-light-emitting portion will be described.

C-1. Polarizer

2 is a plan view of a polarizer according to one embodiment of the present invention. The polarizer 1 is composed of a resin film containing a dichroic substance. The polarizer (resin film) 1 has a non-light-emitting portion 2. The non-light-emitting portion 2 is preferably a low-density portion lower in content of the dichroic substance than the other portion (3). According to such a configuration, cracks, delamination (cracks, cracks, cracks, etc.) are generated as compared with the case where the through holes are formed mechanically (for example, by a method of mechanically knocking off by using a cutter blade, a plotter, Peeling), and a problem of quality such as a problem that the paste comes out is avoided. Since the low-density portion has a low content of the dichroic substance itself, the transparency of the non-polarized portion can be kept favorable as compared with the case where the non-polarized portion is formed by decomposing the dichroic substance by laser light or the like.

In the illustrated example, the small circular circular light-shielding portion 2 is formed at the central portion of the upper end of the polarizer 1, but the number, arrangement, shape, size, etc. of the nonluminous portion can be appropriately designed. For example, it is designed according to the position, shape, size, etc. of the camera portion of the image display device to be mounted. Specifically, the non-polarized light portion is designed not to correspond to a portion (for example, an image display portion) other than the camera of the image display device.

The transmittance of the non-light-emitting portion (for example, the transmittance measured with light at a wavelength of 550 nm at 23 캜) is preferably 50% or more, more preferably 60% or more, further preferably 75% Preferably 90% or more. With such a transmittance, desired transparency can be secured. For example, when the non-light-emitting portion is made to correspond to the camera portion of the image display device, adverse effects on the photographing performance of the camera can be prevented.

The polarizer (excluding the non-light-emitting portion) preferably exhibits absorption dichroism in the wavelength range of 380 nm to 780 nm. The transmittance Ts of the polarizer (excluding the non-light-emitting portion) is preferably 39% or more, more preferably 39.5% or more, still more preferably 40% or more, particularly preferably 40.5% or more. Further, the theoretical upper limit of the mass transmittance is 50%, and the practical upper limit is 46%. Note that the unitary transmittance Ts is a Y value obtained by performing visibility correction on the basis of a 2-degree field of view (C light source) of JIS Z 8701 and is measured using a microscopic spectroscopic system (manufactured by Lambda Vision, LVmicro) can do. The degree of polarization of the polarizer (excluding the non-light-emitting portion) is preferably not less than 99.8%, more preferably not less than 99.9%, still more preferably not less than 99.95%.

The thickness of the polarizer (resin film) can be set to any appropriate value. The thickness is typically 0.5 占 퐉 or more and 80 占 퐉 or less. The thickness of the polarizer is preferably 30 占 퐉 or less, more preferably 25 占 퐉 or less, still more preferably 18 占 퐉 or less, particularly preferably 12 占 퐉 or less, and most preferably less than 8 占 퐉. On the other hand, the thickness is preferably 1 m or more. The thinner the thickness, the better the low density portion can be formed. Concretely, on contact with a decolorizing solution described later, a low-concentration portion can be formed in a shorter time. Further, the thickness of the portion where the decolorizing liquid is contacted may be thinner than other portions. By making the thickness thinner, the difference in thickness between the contact portion with the decoloring liquid and other portions can be made small, and favorable adhesion with other constituent members such as a protective film can be achieved.

Examples of the dichroic material include iodine, organic dyes, and the like. These may be used alone or in combination of two or more. Iodine is preferably used. This is because, by contact with a basic solution to be described later, a low-concentration portion can be formed satisfactorily.

The low density portion is a portion having a lower content of the dichroic substance than the other portion. The content of the dichroic substance in the low density portion is preferably 1.0% by weight or less, more preferably 0.5% by weight or less, and still more preferably 0.2% by weight or less. If the content of the dichroic substance in the low-concentration portion is within this range, the desired transparency can be sufficiently imparted to the low-concentration portion. For example, when the low density portion is made to correspond to the camera portion of the image display device, it is possible to realize excellent shooting performance in terms of both brightness and color taste (color taste). On the other hand, the lower limit value of the content of the dichroic substance in the low density portion is usually below the detection limit value. When iodine is used as the dichroic substance, the iodine content is determined from a calibration curve prepared in advance using a standard sample from the X-ray intensity measured by, for example, fluorescent X-ray analysis.

The difference between the content of the dichroic substance in the other region and the content of the dichroic substance in the low concentration region is preferably 0.5% by weight or more, more preferably 1% by weight or more.

As the resin forming the resin film, any suitable resin may be used. Preferably, a polyvinyl alcohol-based resin (hereinafter referred to as " PVA-based resin ") is used. As the PVA resin, for example, polyvinyl alcohol and ethylene-vinyl alcohol copolymer can be mentioned. Polyvinyl alcohol is obtained by saponifying polyvinyl acetate. The ethylene-vinyl alcohol copolymer is obtained by saponifying an ethylene-vinyl acetate copolymer. The degree of saponification of the PVA resin is usually 85 mol% or more and less than 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. The saponification degree can be obtained according to JIS K 6726-1994. By using such a saponification degree PVA resin, a polarizer excellent in durability can be obtained. If the degree of saponification is too high, there is a fear of gelation.

The average degree of polymerization of the PVA resin can be suitably selected according to the purpose. The average degree of polymerization is usually 1000 to 10000, preferably 1200 to 4500, and more preferably 1500 to 4300. The average polymerization degree can be obtained according to JIS K 6726-1994.

C-2. Method of manufacturing polarizer

Wherein the polarizer is formed by laminating a pressure-sensitive adhesive film formed by peeling a separator on a resin film containing a dichroic substance to obtain a laminated polarizing film, and forming a depolarizing portion at a portion corresponding to the through hole of the pressure- .

C-2-1. The polarizing film laminate

A separator is peeled off from the pressure-sensitive adhesive film obtained by forming a through hole in the laminate, and the pressure-sensitive adhesive film is bonded to a resin film containing a dichroic substance to obtain a polarizing film laminate. 3 is a cross-sectional view of a polarizing film laminate according to one embodiment of the present invention. The polarizing film laminate 100 comprises a resin film (polarizer) 20 containing a dichroic substance and an adhesive film 10a disposed on one side (upper surface in the drawing) of the resin film 20, And a protective film 30 and a surface protective film 40 disposed on the other side of the resin film 20 (the lower surface in the illustrated example). The adhesive film 10a is bonded to the resin film 20 by the adhesive layer 12. And has an exposed portion 21 on which the resin film 20 is exposed on the one surface side (the upper surface side in the drawing) of the polarizing film laminate 100 by the through hole 14 formed in the adhesive film 10a.

It is preferable that the shape of the adhesive film 10a corresponds to the shape of the resin film 20 to be bonded. For example, when the resin film 20 is a long film, the adhesive film 10a becomes a long film. In this case, it is preferable that the lamination of the resin film and the adhesive film is carried out by roll-to-roll. The term " roll-to-roll " refers to stacking films aligned in the longitudinal direction while conveying the films on the rolls. The width dimension of the adhesive film 10a in the longitudinal direction can be designed to be substantially equal to or larger than the width dimension of the resin film 20. [

When the resin film and the pressure-sensitive adhesive film are laminated by a roll-to-roll method, the pressure-sensitive adhesive film may be laminated from a pressure-sensitive adhesive film roll in which a long-length pressure-sensitive adhesive film is wound in the form of a roll and laminated on a resin film. (Once, the adhesive film is not wound) may be laminated on the resin film.

When the adhesive film 10a is a long film, the through holes 14 may be formed at a predetermined interval (that is, in a predetermined pattern) in the longitudinal direction and / or the width direction of the adhesive film 10a. The formation pattern of the through holes 14 can be appropriately set according to the purpose. Typically, the through-holes 14 are formed in a predetermined size (for example, cutting in a long direction and / or width direction, punching) to attach the polarizer 20 to an image display device of a predetermined size , And is formed at a position corresponding to the camera section of the image display apparatus.

C-2-2. Formation of non-light-emitting part

As described above, it is preferable to form the light-shielding portion by forming a lightly-doped portion having a content of the dichroic substance lower than that of the other portions. The low density portion is formed, for example, by contacting any suitable decoloring liquid to a resin film containing a dichroic substance. As the decoloring solution, a basic solution is preferably used. When iodine is used as the dichroic substance, the iodine content of the contact portion can be easily reduced by bringing a basic solution into contact with a desired site of the resin film. Specifically, by contact, the basic solution can penetrate into the resin film. The iodine complex contained in the resin film is reduced by the base contained in the basic solution and becomes an iodide ion. By reducing the iodine complex to iodine ion, the transmittance of the contact portion can be improved. Then, the iodine that has become iodine ion moves from the resin film into the solvent of the basic solution. The low-density portion obtained in this way can have a good transparency. Specifically, when the iodine complex is destroyed to improve the transmittance, the iodine remaining in the resin film forms an iodine complex again depending on the use of the polarizer, and the transmittance may be lowered. However, when the iodine content is reduced, Is prevented.

As the basic compound, any suitable basic compound can be used. Examples of the basic compound include hydroxides of alkali metals such as sodium hydroxide, potassium hydroxide and lithium hydroxide; hydroxides of alkaline earth metals such as calcium hydroxide; inorganic alkali metal salts such as sodium carbonate; organic alkali metal salts such as sodium acetate; . Among them, hydroxides of an alkali metal and / or an alkaline earth metal are preferably used, and sodium hydroxide, potassium hydroxide and lithium hydroxide are more preferably used. The dichroic substance can be efficiently ionized, and a lightly doped region can be formed more easily. These basic compounds may be used alone or in combination of two or more.

As a solvent for the basic solution, any suitable solvent may be used. Specific examples include water, alcohols such as ethanol and methanol, ether, benzene, chloroform, and mixed solvents thereof. Among them, water and alcohol are preferably used in that the ionized dichroic material can be preferably migrated into a solvent.

The concentration of the basic solution is, for example, 0.01 N to 5 N, preferably 0.05 N to 3 N, and more preferably 0.1 N to 2.5 N. If the concentration is in this range, the desired low concentration portion can be formed satisfactorily.

The liquid temperature of the basic solution is, for example, 20 ° C to 50 ° C. The contact time of the basic solution is set depending on, for example, the thickness of the resin film, and the kind and concentration of the basic compound contained in the basic solution. The contact time is, for example, 5 seconds to 30 minutes, preferably 5 seconds to 5 minutes.

As a method of contacting the decolorizing liquid, any suitable method can be employed. For example, a method of dripping, coating and spraying a decolorizing liquid with respect to a resin film (exposed portion), and a method of dipping a resin film (polarizing film laminate) into a decolorizing solution. By using the above-mentioned pressure-sensitive adhesive film, it is possible to prevent the decolorizing liquid from contacting other than a desired portion. As a result, the non-light-emitting portion having a desired shape can be formed well.

In the illustrated example, the one side of the resin film 20 is protected by the adhesive film 10a, and the other side is protected by the protective film 30 and the surface protection film 40. Thus, it is preferable to protect the other side of the resin film (the side on which the adhesive film is not disposed) at the time of forming the non-light-emitting portion. The protective film can be used as it is as a protective film of a polarizer. The surface protective film is used temporarily during the production of the polarizer. Therefore, the adhesive film 10a can function as a surface protective film. In the illustrated example, one side of the resin film 20 is protected by the protective film 30 and the surface protective film 40, but either side may be protected. Instead of a protective film or a surface protective film, a photoresist or the like may be used. Details of the protective film will be described later.

When the non-light-emitting portion is formed, the resin film is preferably in a state in which it can be used as a polarizer. Specifically, it is preferable that various treatments such as swelling treatment, stretching treatment, dyeing treatment with the dichroic substance, crosslinking treatment, washing treatment, drying treatment and the like are carried out. Further, when various treatments are carried out, the resin film may be a resin layer formed on a substrate. The laminate of the base material and the resin layer can be obtained by, for example, a method of applying a coating liquid containing a material for forming the resin film to a substrate, a method of laminating a resin film on a substrate, and the like.

The dyeing treatment is typically carried out by adsorbing a dichroic substance. Examples of the adsorption method include a method in which a resin film is immersed in a dyeing solution containing a dichroic substance, a method in which the dyeing solution is applied to a resin film, a method in which the dyeing solution is sprayed onto a resin film, and the like . Preferably, the resin film is immersed in the dyeing solution. This is because the dichroic material can be adsorbed well.

When iodine is used as the dichroic substance, an iodine aqueous solution is preferably used as the dyeing liquid. The blending amount of iodine is preferably 0.04 parts by weight to 5.0 parts by weight based on 100 parts by weight of water. In order to increase the solubility of iodine in water, it is preferable to add iodide to an aqueous solution of iodine. As the iodide, potassium iodide is preferably used. The blending amount of iodide is preferably 0.3 to 15 parts by weight based on 100 parts by weight of water.

In the stretching treatment, the resin film is uniaxially stretched at a stretch ratio of typically 3 to 7 times. Further, the stretching direction may correspond to the absorption axis direction of the obtained polarizer.

By the various treatments described above, the resin film may contain boric acid. For example, boric acid may be contained in the resin film by bringing a boric acid solution (for example, an aqueous solution of boric acid) into contact during the stretching treatment and the crosslinking treatment. The content of boric acid in the resin film is, for example, 10% by weight to 30% by weight. The content of boric acid in the contact portion with the basic solution is, for example, 5 wt% to 12 wt%.

C-2-3. Other

The polarizing film laminate (resin film) may be subjected to any suitable other treatment. Other treatments include, for example, reduction of alkali metals and / or alkaline earth metals. Concretely, alkali metals and / or alkaline earth metals contained in the resin film are reduced in a contact portion in contact with the basic solution after the contact with the basic solution. By reducing the alkali metal and / or alkaline earth metal, a non-light-emitting portion having excellent dimensional stability can be obtained. Concretely, even in a humidified environment, the shape of the low-density portion formed by contact with the basic solution can be maintained as it is.

By contacting a basic solution with the resin film, a hydroxide of an alkali metal and / or an alkaline earth metal may remain at the contact portion. Further, by contacting a basic solution with the resin film, a metal salt of an alkali metal and / or an alkaline earth metal may be formed at the contact portion. These ions can generate hydroxide ions, and the generated hydroxide ions act on the dichroic material (for example, iodine complex) present around the contact portion to decompose or reduce the nonpolarized region (low concentration region) have. Therefore, it is considered that by reducing the alkali metal and / or alkaline earth metal, the non-polarized region can be prevented from widening with time, and the desired shape of the light-shielding portion can be maintained.

The metal salt capable of generating the hydroxide ion includes, for example, a borate salt. The borate may be produced by neutralizing the boric acid contained in the resin film in a basic solution (a solution of a hydroxide of an alkali metal and / or a hydroxide of an alkaline earth metal). Further, the borate (metaborate) can be hydrolyzed to produce hydroxide ions, for example, as shown in the following formula, by placing the polarizer under a humidified environment.

[Chemical Formula 1]

(Wherein X represents an alkali metal or an alkaline earth metal)

The content of the alkali metal and / or alkaline earth metal in the contact portion is preferably reduced to 3.6 wt% or less, more preferably 2.5 wt% or less, and further preferably 1.0 wt% or less. The rate of reduction is preferably at least 10%, more preferably at least 40%, and even more preferably at least 80%. Further, as described above, the alkali metal and / or alkaline earth metal may exist in a state of a metal compound (hydroxide, metal salt), for example, in the contact portion, Ray intensity measured by an X-ray diffractometer using a standard sample.

The resin film may contain an alkali metal and / or an alkaline earth metal in advance by being subjected to various treatments for making it a polarizer. Specifically, by contacting a solution of iodide such as potassium iodide, the resin film may contain an alkali metal and / or an alkaline earth metal. Thus, it is generally considered that the alkali metal and / or alkaline earth metal contained in the polarizer does not adversely affect the dimensional stability of the non-light-emitting portion.

As the abatement method, a method of bringing a treatment liquid into contact with a contact portion with a basic solution is preferably used. According to this method, the alkali metal and / or the alkaline earth metal can be transferred from the resin film to the treatment liquid, and the content thereof can be reduced.

Any appropriate method may be employed as the method of contacting the treatment liquid. For example, a method of dropping, coating, or spraying a treatment liquid with respect to a contact portion with a basic solution, or a method of immersing a contact portion with a basic solution in a treatment liquid. In addition, it is preferable that the treatment liquid is brought into contact with the resin film in a state in which the adhesive film is stuck (particularly when the temperature of the treatment liquid is 50 DEG C or higher). According to this aspect, deterioration of the polarization characteristics due to the treatment liquid can be prevented at a portion other than the portion in contact with the basic solution.

The treatment liquid may comprise any suitable solvent. Examples of the solvent include water, alcohols such as ethanol and methanol, ether, benzene, chloroform, and mixed solvents thereof. Among these, water and alcohol are preferably used from the viewpoint of efficiently transferring the alkali metal and / or the alkaline earth metal. As the water, any suitable water can be used. For example, tap water, pure water, deionized water, and the like.

The temperature of the treatment liquid at the time of contact is, for example, 20 DEG C or higher, but is preferably 50 DEG C or higher, more preferably 60 DEG C or higher, and even more preferably 70 DEG C or higher. With such a temperature, the alkali metal and / or alkaline earth metal can be efficiently transferred to the treatment liquid. Concretely, the swelling rate of the resin film is remarkably improved, and the alkali metal and / or alkaline earth metal in the resin film can be physically removed. On the other hand, the temperature of water is substantially 95 DEG C or lower.

The contact time can be appropriately adjusted depending on the contact method, the type and temperature of the treatment liquid, the thickness of the resin film, and the like. For example, when immersed in warm water (50 占 폚 or more), the contact time is preferably 10 seconds to 30 minutes, more preferably 30 seconds to 15 minutes, and still more preferably 60 seconds to 10 minutes.

In one embodiment, an acidic solution is used as the treatment liquid. By using the acidic solution, the alkali metal and / or alkaline earth metal hydroxide remaining in the resin film can be neutralized, and the alkali metal and / or alkaline earth metal in the resin film can be chemically removed.

As the acidic compound contained in the acidic solution, any suitable acidic compound can be used. Examples of the acidic compound include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, hydrogen fluoride and boric acid, and organic acids such as formic acid, oxalic acid, citric acid, acetic acid and benzoic acid. The acidic compound contained in the acidic solution is preferably an inorganic acid, more preferably hydrochloric acid, sulfuric acid or nitric acid. These acidic compounds may be used alone or in combination of two or more.

Preferably, as the acidic compound, an acidic compound having an acidity higher than that of boric acid is preferably used. (Borate salt) of the above alkali metal and / or alkaline earth metal. Concretely, the alkali metal and / or alkaline earth metal in the resin film can be chemically removed by liberating boric acid from the borate.

As an index of the acidity, for example, an acid dissociation constant (pKa) can be mentioned, and an acidic compound having a pKa smaller than the pKa (9.2) of boric acid is preferably used. Specifically, the pKa is preferably less than 9.2, more preferably not more than 5. The pKa may be measured using any suitable measuring device, or may be the value described in the literature, such as Chemical Bulletin Basic Revision 5 (edited by Maruzen Publishing Co., Japan). In addition, the value of pKa can be changed in each step in the acid compound which dissociates in multi-steps. When such an acidic compound is used, which of the values of pKa in each step is within the above range is used. In the present specification, pKa refers to a value in an aqueous solution at 25 占 폚.

The difference between the pKa of the acidic compound and the pKa of the boric acid is, for example, 2.0 or more, preferably 2.5 to 15, and more preferably 2.5 to 13. With such a range, the alkali metal and / or alkaline earth metal can be efficiently transferred to the treatment liquid.

An acidic compound which can satisfy the said pKa, for example, hydrochloric acid (pKa: -3.7), sulfuric acid (pK _2: 1.96), nitric acid (pKa: -1.8), hydrogen fluoride (pKa: 3.17), formic acid (pKa : such as 4.0): 3.54), oxalic acid _{(pK 1: 1.04, pK 2} : 3.82), citric acid _{(pK 1: 3.09, pK 2} : 4.75, pK 3: 6.41), acetic acid (pKa: 4.8), benzoic acid (pKa .

Further, the solvent of the acidic solution (treatment liquid) is as described above, and physical removal of the alkali metal and / or alkaline earth metal in the resin film can also occur in this embodiment using the acidic solution as the treatment liquid.

The concentration of the acidic solution is, for example, 0.01 N to 5 N, preferably 0.05 N to 3 N, and more preferably 0.1 N to 2.5 N.

The liquid temperature of the acidic solution is, for example, 20 ° C to 50 ° C. The contact time of the acidic solution is set according to, for example, the thickness of the resin film and the kind or concentration of the acidic compound contained in the acidic solution. The contact time is, for example, 5 seconds to 30 minutes.

As another example of the other treatment, the removal of the basic solution and / or the treatment solution may be mentioned. Specific examples of the removal method include removal by wiping, wiping, suction removal, natural drying, heat drying, air blow drying, and vacuum drying. Examples of the cleaning liquid used for cleaning include water (pure water), alcohol such as methanol and ethanol, and a mixture thereof. Preferably, water is used. The number of times of cleaning is not particularly limited and may be carried out plural times. When removed by drying, the drying temperature is, for example, 20 to 100 캜.

The adhesive film is peeled from the resin film (polarizer) at any appropriate timing after the formation of the retardation portion. For example, when reducing the alkali metal and / or alkaline earth metal, it is preferable to peel off the adhesive film from the resin film after the reduction.

C-3. Polarizer

The polarizing plate of the present invention has the polarizer. Typically, the polarizer is used by laminating a protective film on at least one side thereof. Examples of the material for forming the protective film include cellulose resins such as diacetylcellulose and triacetylcellulose, olefinic resins such as (meth) acrylic resins, cycloolefin resins and polypropylene, polyethylene terephthalate resins and the like Ester-based resins, polyamide-based resins, polycarbonate-based resins, and copolymer resins thereof.

The surface of the protective film on which the polarizer is not laminated may be subjected to a treatment for the purpose of hard coat layer, anti-reflection treatment, diffusion or anti-glare as the surface treatment layer.

The thickness of the protective film is preferably 10 mu m to 100 mu m. Typically, the protective film is laminated on the polarizer via an adhesive layer (specifically, an adhesive layer and a pressure-sensitive adhesive layer). The adhesive layer is typically formed of a PVA adhesive or an active energy ray curable adhesive. The pressure-sensitive adhesive layer is typically formed of an acrylic pressure-sensitive adhesive.

Example

[Example 1]

(Surface protective film) having a configuration of an ester film (38 占 퐉 thick) / a pressure-sensitive adhesive layer (5 占 퐉 thick) / a separator (25 占 퐉 thick) was prepared. A carrier film having a composition of an ester film (38 占 퐉 thick) / a pressure-sensitive adhesive layer (5 占 퐉 thickness) was laminated on the ester film side of this laminate to prepare a laminate having a carrier film adhered thereon.

Subsequently, a cutting blade having a depth of 80 mu m was inserted from the separator surface with respect to the laminate to which the carrier film was attached using a punching device, and the carrier film was half-cut into a circular shape having a diameter of 2.4 mm so as not to penetrate.

Subsequently, the carrier film was peeled from the laminate to obtain a pressure-sensitive adhesive film.

[Example 2]

A pressure-sensitive adhesive film was obtained in the same manner as in Example 1 except that a half cut (cut depth: 80 탆) was used in place of the punching device by using a laser cutter (CO ₂ laser, wavelength: 9.4 탆, output: 10 W).

[Comparative Example 1]

A pressure-sensitive adhesive film was obtained in the same manner as in Example 1 except that the carrier film was bonded to the separator surface of the laminate and the half-cut was made from the ester film (resin substrate) side.

The following evaluations were carried out for Examples 1 and 2 and Comparative Example 1.

1. Perforated debris

It was confirmed whether or not the perforation residue due to cutting was removed when peeling off the carrier film.

2. Adhesion appearance of adhesive film

The separator was peeled off, and the pressure-sensitive adhesive film was bonded to a commercially available polarizer, and the appearance thereof was observed with a microscope.

In Examples 1 and 2, when the carrier film was peeled, the perforation residue caused by the half cut was completely removed. On the other hand, in Comparative Example 1, when the carrier film was peeled off, the perforation residue was not completely removed. Specifically, only the separator portion of the laminate was removed.

The obtained pressure-sensitive adhesive film was attached to a polarizer, and the state of bonding between the polarizer and the pressure-sensitive adhesive film was observed. In Comparative Example 1, the perforated scraps were removed in advance, and then an adhesive film was stuck to the polarizer.

In Examples 1 and 2, as shown in Fig. 4 (a), the incorporation of air bubbles was not confirmed between the polarizer and the adhesive film, but in Comparative Example 1, as shown in Fig. 4 (b) Bubbles were mixed in between the films.

Cutting method Cutting direction Appearance appearance Example 1 Punching device Separator side No bubble mixing Example 2 Laser light irradiation Separator side No bubble mixing Comparative Example 1 Punching device Resin substrate side Bubble mixed

[Example 3]

(Production of polarizing plate)

As the substrate, an amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 mu m) having a water absorption rate of 0.75% and a Tg of 75 DEG C was used. (Polymerization degree: 4200, degree of saponification: 99.2 mol%) and acetoacetyl modified PVA (degree of polymerization: 1200, degree of acetoacetyl denaturation: 4.6%, degree of saponification: 99.0 mol) were added to the corona- % Or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Kosei Pimer Z200) at a ratio of 9: 1 was applied at 25 캜 and dried to form a PVA resin layer having a thickness of 11 탆, .

The resultant laminate was free-end uniaxially stretched in an oven at 120 캜 at a stretch ratio of 2.0 times in the machine direction (longitudinal direction) between the rolls having different circumferential speeds (air assisted stretching).

Subsequently, the laminate was immersed (insolubilization treatment) for 30 seconds in an insolubilizing bath (a boric acid aqueous solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 30 占 폚.

Subsequently, the polarizing plate was immersed in a dyeing bath at a liquid temperature of 30 캜 while adjusting the iodine concentration and immersion time so that the polarizing plate had a predetermined transmittance. In this embodiment, 0.2 part by weight of iodine was blended with 100 parts by weight of water, and 1.5 parts by weight of potassium iodide was blended, followed by immersion for 60 seconds in an aqueous iodine solution (dyeing treatment).

Subsequently, the resultant was immersed in a crosslinking bath (aqueous solution of boric acid obtained by mixing 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water) at 30 占 폚 for 30 seconds (crosslinking treatment).

Thereafter, the laminate was immersed in a boric acid aqueous solution having a liquid temperature of 70 캜 (an aqueous solution obtained by mixing 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water) And uniaxial stretching was performed so that the total stretching magnification was 5.5 times in the longitudinal direction (longitudinal direction) (underwater stretching).

Thereafter, the laminate was immersed in a cleansing bath (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at 30 ° C (cleaning treatment).

Subsequently, a PVA resin aqueous solution (trade name: "GOSE PYMER (registered trademark) Z-200" manufactured by Nippon Synthetic Chemical Industry Co., Ltd., resin concentration: 3 wt%) was applied to the surface of the PVA resin layer of the laminate, (Thickness: 25 mu m) were laminated and heated in an oven kept at 60 DEG C for 5 minutes. Thereafter, the substrate was peeled from the PVA-based resin layer to obtain a polarizing plate (polarizer (transmittance: 42.3%, thickness: 5 占 퐉) / protective film).

(Formation of transparent part)

The pressure-sensitive adhesive film obtained in Example 1 was peeled off and attached to the polarizer side of the obtained polarizing plate to obtain a polarizing film laminate.

A room temperature sodium hydroxide aqueous solution (1.0 mol / l (1.0 N)) was dropped from the pressure-sensitive adhesive film of the obtained polarizing film laminate to the portion where the polarizer was exposed, and left for 60 seconds. Thereafter, the dropwise aqueous sodium hydroxide solution was removed by a mop, and the pressure-sensitive adhesive film was peeled off to obtain a polarizing plate (polarizer) having a transparent portion.

[Example 4]

A polarizing plate (polarizer) having a transparent portion was obtained in the same manner as in Example 3 except that the pressure-sensitive adhesive film obtained in Example 2 was used.

[Comparative Example 2]

A polarizing plate (polarizer) having a transparent portion was obtained in the same manner as in Example 3 except that the pressure-sensitive adhesive film obtained in Comparative Example 1 was used. The adhesive film obtained in Comparative Example 1 was preliminarily subjected to punching after removing the punched debris.

The following measurements were carried out on the transparent portions of the polarizers obtained in Examples 3 and 4 and Comparative Example 2.

1. Transmittance (Ts)

(DOT-3, manufactured by Murakami Color Research Laboratory Co., Ltd.). The transmittance T is a Y value obtained by performing visibility correction using a 2-degree visual field (C light source) of JIS Z 8701-1982.

2. Iodine Content

The content of iodine in the transparent part of the polarizer was determined by fluorescent X-ray analysis. Specifically, the iodine content of the polarizer was determined from the X-ray intensity measured under the following conditions using a calibration curve prepared in advance using a standard sample.

Analytical Apparatus: A fluorescent X-ray analyzer (XRF) manufactured by Rigaku Denki Kogyo, product name "ZSX100e"

· Large cathode: Rhodium

· Spectroscopic crystals: lithium fluoride

Excitation energy: 40 kV - 90 ㎃

· Iodine measuring line: I-LA

· Quantitative method: FP method

· 2θ angle peak: 103.078 deg (iodine)

· Measurement time: 40 seconds

In any case, transparent portions having a transmittance of 93% to 94% and an iodine content of 0.15% by weight or less are formed, and these can function as a non-light-emitting portion. The shape of the non-light-emitting portion of the polarizer of Examples 3 and 4 was a circle of 2.4 mm in diameter corresponding to the shape of the through hole of the pressure-sensitive adhesive film, while the shape of the non- The shape corresponding to the through hole of the pressure-sensitive adhesive film was not obtained (it was not circular) because the aqueous sodium hydroxide solution penetrated into the incorporated bubbles.

(1.0 mol / l (1.0 N)) at room temperature was removed at the contact portion with an aqueous solution of sodium hydroxide in the same manner as in Example 3 except that the adhesive film was not peeled off after forming the transparent portion (after removing the aqueous solution of sodium hydroxide by a mop) And left for 30 seconds. Thereafter, the dropped hydrochloric acid was removed by a mop. The sodium content of the transparent portion before and after the contact with the hydrochloric acid was determined by fluorescent X-ray analysis. Specifically, the sodium content of the transparent portion was determined from the X-ray intensity measured under the following conditions by a calibration curve prepared in advance using a standard sample.

· Analytical Apparatus: Fluorescent X-ray analyzer (XRF) manufactured by Rigaku Kogyo Co., Ltd. Product name "ZSX100e"

· Large cathode: Rhodium

· Spectroscopic crystals: lithium fluoride

Excitation energy: 40 kV - 90 ㎃

· Sodium measuring line: Na - KA

· Quantitative method: FP method

· Measurement time: 40 seconds

The sodium content of the transparent part was 4.0% by weight before contact with hydrochloric acid, and 0.04% by weight after contact with hydrochloric acid. When the polarizing plate on which the transparent part was formed was placed under the environment of 65 ° C / 90% RH for 500 hours, the transparent part in contact with hydrochloric acid hardly changed in size before and after the humidification test. On the other hand, The size of the boat was large.

Industrial availability

The pressure-sensitive adhesive film obtained by the production method of the present invention can be preferably used as a surface protective film for selectively treating a predetermined portion of an object. The polarizer obtained by the production method of the present invention is preferably used for an image display device (liquid crystal display device, organic EL device) equipped with a camera such as a mobile phone such as a smart phone, a notebook PC, and a tablet PC.

1: Polarizer (resin film)
2:
10:
10a: Adhesive film
11: resin substrate
12: pressure-sensitive adhesive layer
13: Separator
14: Through hole
20: Resin film
21:
30: Protective film
40: Surface protective film
100: polarizing film laminate

Claims (15)

Preparing a laminate having a resin substrate and a pressure-sensitive adhesive layer formed on one surface of the resin substrate and a separator temporarily mounted on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer; and
And a through hole which is cut from the side of the separator of the laminate so as to integrally penetrate the separator, the pressure-sensitive adhesive layer and the resin base material is formed
Wherein the pressure-sensitive adhesive layer has a thickness of 100 to 500 nm. The method according to claim 1,
Wherein the through hole is formed in a state in which the abutting material is placed on the resin base material side of the laminate. 3. The method of claim 2,
Wherein the penetration hole is formed by being cut from the surface of the separator in the middle of the abutting member. The method according to claim 2 or 3,
Wherein the abutting member is bonded to the laminate with an adhesive. 5. The method according to any one of claims 2 to 4,
Further comprising peeling off the abutting member from the laminate. 6. The method according to any one of claims 1 to 5,
Wherein the formation of the through-holes is carried out by cutting with a cutting blade. 6. The method according to any one of claims 1 to 5,
Wherein the formation of the through-holes is performed by laser light irradiation. A process for producing a film, which comprises adhering a pressure-sensitive adhesive film obtained by the production method according to any one of claims 1 to 7 to a film, and selectively treating the portion corresponding to the through-hole of the film. Peeling the separator from the pressure-sensitive adhesive film obtained by the manufacturing method according to any one of claims 1 to 7, and
A method for producing a polarizer, which comprises adhering an adhesive film formed by peeling the separator to a resin film containing a dichroic substance, and forming a light-blocking portion at a portion corresponding to the through hole of the adhesive film of the resin film. 10. The method of claim 9,
The formation of the through-hole is carried out by cutting with a cutting edge,
Wherein the pressure-sensitive adhesive film from which the separator is peeled has a resin base material and a pressure-sensitive adhesive layer formed on one surface of the resin base material, a through-hole penetrating the resin base material and the pressure-sensitive adhesive layer integrally therewith is formed, Is formed on the circular arc surface. 11. The method according to claim 9 or 10,
Further comprising peeling the adhesive film from the resin film containing the dichroic substance after forming the non-light-emitting portion. 12. The method according to any one of claims 9 to 11,
Wherein the light-blocking portion is formed by contacting a basic solution with a resin film containing the dichroic substance. 13. The method of claim 12,
Wherein the basic solution comprises a hydroxide of an alkali metal and / or an alkaline earth metal. The method according to claim 12 or 13,
Further comprising reducing the alkali metal and / or alkaline earth metal contained in the resin film at the contact portion with the basic solution. 15. The method of claim 14,
Wherein the alkali metal and / or alkaline earth metal is reduced while the adhesive film is stuck to the resin film containing the dichroic substance.

Images