CN106661392B - Method for producing longitudinal adhesive film, method for producing film, and method for producing polarizing plate having non-polarizing portion - Google Patents
Method for producing longitudinal adhesive film, method for producing film, and method for producing polarizing plate having non-polarizing portion Download PDFInfo
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- CN106661392B CN106661392B CN201580035090.0A CN201580035090A CN106661392B CN 106661392 B CN106661392 B CN 106661392B CN 201580035090 A CN201580035090 A CN 201580035090A CN 106661392 B CN106661392 B CN 106661392B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
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Abstract
The invention provides a method for manufacturing a longitudinal adhesive film which can be used as a surface protection film or a mask when a predetermined part of the longitudinal film is processed at low cost and high productivity. The method for producing an adhesive film having a longitudinal shape of the present invention comprises: preparing a longitudinal laminate having a longitudinal resin film and an adhesive layer provided on one surface of the resin film; and forming through holes penetrating the resin film and the adhesive layer at predetermined intervals along the longitudinal direction and/or the width direction.
Description
Technical Field
The present invention relates to a method for producing an adhesive film having a longitudinal shape. More specifically, the present invention relates to a method for producing a vertically long adhesive film having through holes arranged in a predetermined pattern.
Background
Some image display devices such as mobile phones and notebook Personal Computers (PCs) are equipped with internal electronic components such as cameras. Various studies have been made for the purpose of improving the camera performance of such an image display device (for example, patent documents 1 to 7). However, due to the rapid spread of smart phones and touch panel type information processing apparatuses, further improvement in camera performance and the like is desired. In order to cope with diversification of shapes and high functionality of image display devices, polarizing plates having polarization performance locally are required. In order to industrially and commercially realize these desires, it is desirable to manufacture the image display device and/or its parts at an allowable cost, but various research matters remain in order to determine such a technique.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-81315
Patent document 2: japanese patent laid-open publication No. 2007-241314
Patent document 3: japanese U.S. patent application laid-open No. 2004/0212555
Patent document 4: korean laid-open patent No. 10-2012-0118205
Patent document 5: korean patent No. 10-1293210
Patent document 6: japanese laid-open patent publication No. 2012-137738
Patent document 7: U.S. patent application publication No. 2014/0118826 specification
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above-described conventional problems, and a main object thereof is to provide a method for producing an adhesive film in a longitudinal shape at low cost and high productivity, which is suitably used as a surface protective film or a mask when a predetermined portion of the longitudinal film is treated.
Means for solving the problems
The method for producing an adhesive film of the present invention comprises: preparing a longitudinal laminate having a longitudinal resin film and an adhesive layer provided on one surface of the resin film; and through holes integrally penetrating the resin film and the adhesive layer are formed at predetermined intervals along the longitudinal direction and/or the width direction of the laminate.
In 1 aspect, the through holes are formed at predetermined intervals along the longitudinal direction of the laminate.
In 1 aspect, the through holes are formed at substantially equal intervals along at least a longitudinal direction of the laminate.
In 1 aspect, the through holes are formed at substantially equal intervals along the longitudinal direction and the width direction of the laminate.
In 1 embodiment, the through-holes are formed in a dot pattern.
In 1 aspect, the through-hole has a substantially circular shape or a substantially rectangular shape in a plan view.
In 1 embodiment, the through-hole is formed by cutting with a cutter.
In 1 aspect, the laminate further includes a long-length separator temporarily detachably fixed to the adhesive layer, and in the manufacturing method, the through-hole is formed to integrally penetrate the resin film, the adhesive layer, and the separator.
In 1 claim, the through-hole through which the separator, the adhesive layer, and the resin film integrally penetrate is formed by cutting from the separator side of the laminate.
In 1 claim, the through-hole is formed in a state where a contact material is in contact with the resin film side of the laminate.
In 1 claim, the through hole is formed by cutting from a surface of the spacer to a middle of the contact member.
In 1 aspect, the abutment member is elongated.
In 1 aspect, the contact material is bonded to the laminate with an adhesive.
In 1 aspect, the method further comprises detaching the abutment member from the laminate.
In 1 aspect, the manufacturing method further includes winding the laminate into a roll shape after the through-hole is formed.
According to another aspect of the present invention, a method for manufacturing a film can be provided. In this method, the adhesive films obtained by the above-described production method are bonded to a longitudinal film so that the longitudinal directions of the adhesive films are aligned, and the portions of the film corresponding to the through-holes are selectively treated.
According to another aspect of the present invention, a method for manufacturing a polarizing plate having a non-polarizing portion can be provided. This method uses an adhesive film produced by the above-described production method.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a method of manufacturing an adhesive film having a longitudinal shape with through holes arranged at predetermined intervals (i.e., in a predetermined pattern) in the longitudinal direction and/or the width direction at low cost and high productivity can be provided. The adhesive film produced by the production method of the present invention can be suitably used as a surface protective film or a mask when a predetermined portion of a film (typically, a longitudinal film) is selectively treated. By using such an adhesive film, continuous processing can be performed while roll conveying is performed, and therefore, the processing efficiency of various selective processes can be made extremely high. Further, by using such an adhesive film, since the selectively processed portion can be precisely controlled and arranged over the entire longitudinal film, it is possible to significantly suppress variation in quality of each final product when the final product having a predetermined size is cut from the longitudinal film.
Drawings
Fig. 1A is a schematic plan view illustrating an example of the arrangement pattern of through holes in an adhesive film produced by the production method according to the embodiment of the present invention.
Fig. 1B is a schematic plan view illustrating another example of the arrangement pattern of through holes in the adhesive film produced by the production method according to the embodiment of the present invention.
Fig. 1C is a schematic plan view illustrating still another example of the arrangement pattern of through holes in the adhesive film produced by the production method according to the embodiment of the present invention.
Fig. 2 is a schematic perspective view illustrating adhesion between an adhesive film and a polarizing plate in a method for manufacturing a polarizing plate using the adhesive film manufactured by the manufacturing method of the embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating formation of a non-polarizing portion in a method for producing a polarizing plate using an adhesive film produced by the production method according to the embodiment of the present invention.
Fig. 4 is an observation photograph of the adhesive film of the example after being bonded to the polarizing plate.
Detailed Description
Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.
The method for manufacturing an adhesive film according to an embodiment of the present invention includes the following steps: preparing a longitudinal laminate having a longitudinal resin film and an adhesive layer provided on one surface of the resin film; and through holes integrally penetrating the resin film and the adhesive layer are formed at predetermined intervals along the longitudinal direction and/or the width direction of the laminate. The following description will be specifically made.
A. Resin film/adhesive layer laminate
In the production method of the present invention, first, a long laminate having a long resin film and a pressure-sensitive adhesive layer provided on one surface of the resin film is prepared. In the present specification, "elongated shape" means an elongated shape having a length sufficiently long with respect to a width, and includes, for example, an elongated shape having a length 10 times or more, preferably 20 times or more, as long as a width.
The resin film functions as a base material of the adhesive film to be produced. The resin film is preferably a film having a high hardness (e.g., elastic modulus). This is because deformation of the through-hole during transportation and/or adhesion can be prevented. Examples of the material for forming the resin film include resin-based resins such as polyethylene terephthalate-based resins, cycloolefin-based resins such as norbornene-based resins, olefin-based resins such as polypropylene, polyamide-based resins, polycarbonate-based resins, and copolymer resins thereof. The resin is preferably a resin (particularly, a polyethylene terephthalate resin). As long as such a material is used, the following advantages are obtained: the elastic modulus is sufficiently high that even if tension is applied during transportation and/or bonding, deformation of the through-hole is unlikely to occur.
The thickness of the resin film is typically 20 μm to 250 μm, and preferably 30 μm to 150 μm. As long as the thickness is as follows: even if tension is applied during transportation and/or bonding, deformation of the through-hole is less likely to occur.
The elastic modulus of the resin film is preferably 2.2kN/mm2～4.8kN/mm2. The elastic modulus of the resin film in such a range has the following advantages: even if tension is applied during transportation and/or bonding, deformation of the through-hole is less likely to occur. Further, the modulus of elasticity can be measured according to JIS K6781.
The tensile elongation of the resin film is preferably 90% to 170%. The resin film has such a tensile elongation that it is difficult to break during conveyance. Further, the tensile elongation can be measured according to JIS K6781.
As the pressure-sensitive adhesive layer, any appropriate pressure-sensitive adhesive layer may be used as long as the effects of the present invention can be obtained. Examples of the base resin of the binder include acrylic resins, styrene resins, and silicone resins. From the viewpoints of chemical resistance, adhesion for preventing the entry of a treatment liquid during immersion, freedom in the degree of adhesion to an adherend, and the like, an acrylic resin is preferred. Examples of the crosslinking agent that can be contained in the adhesive include isocyanate compounds, epoxy compounds, and bisimine compounds. The binder may also contain, for example, a silane coupling agent. The fitting place of the adhesive may be appropriately set according to the purpose.
The adhesive layer may be formed by any suitable method. Specific examples thereof include a method of applying an adhesive solution to a resin film and drying the adhesive solution, a method of forming an adhesive layer on a separator and transferring the adhesive layer to the resin film, and the like. Examples of the coating method include roll coating such as reverse coating and gravure coating, spin coating, screen coating, spray coating, dipping, and spraying.
The thickness of the adhesive layer is preferably 1 μm to 60 μm, more preferably 3 μm to 30 μm. If the thickness is too thin, the adhesiveness may become insufficient, and air bubbles may enter the adhesion interface. If the thickness is too large, problems such as adhesive overflow are likely to occur.
In 1 embodiment, the laminate of the resin film/adhesive layer may further include a long-length separator temporarily fixed to the adhesive layer in a peelable manner. The separator has a function as a protective material for protecting the adhesive film (adhesive layer) until supplied to practical use. Further, by using the separator, the adhesive film can be wound up in a roll shape well. Examples of the separator include plastic (for example, polyethylene terephthalate (PET), polyethylene, and polypropylene) films, nonwoven fabrics, and papers, which are surface-coated with a release agent such as a silicone release agent, a fluorine release agent, and a long-chain alkyl acrylate release agent. The thickness of the spacer can be any appropriate thickness according to the purpose. The thickness of the spacer is, for example, 10 μm to 100 μm. The separator may be laminated on the resin film/adhesive layer laminate, or the adhesive layer may be formed on the separator and the separator/adhesive layer laminate may be laminated on the resin film.
B. Formation of through-holes
Next, a through-hole is formed in the laminate of the resin film/adhesive layer (/ spacer if necessary). The through-hole integrally penetrates the resin film and the adhesive layer (and the separator, if present). The through-holes may be formed by, for example, cutting of the laminate or removal (e.g., laser ablation or chemical dissolution) of predetermined portions of the laminate. Examples of the cutting method include a mechanical cutting method using a cutter blade (punching die) such as a thomson blade or a sharp blade (ピクナル edge in japanese), and a water jet (water jet), and a cutting method by irradiating a laser beam.
The cutting of the cutting knife may be performed by any suitable pattern. For example, the cutting may be performed by using a punching device in which a plurality of cutting blades are arranged in a predetermined pattern, or may be performed by moving the cutting blades by using a device such as an XY plotter. In this way, since the dicing blade can be moved to perform dicing in accordance with a predetermined position of the laminate, the through-hole can be formed at a desired position of the laminate with high accuracy. In the 1 embodiment, the cutting blade can cut the long laminate appropriately in conjunction with the roll conveyance. More specifically, by appropriately adjusting the timing of cutting and/or the moving speed of the cutting blade in consideration of the conveying speed of the laminate, it is possible to form a through hole at a desired position of the laminate. The punching device may be of a reciprocating type (flat beating) or a rotary type (rotating).
As the laser used for dicing, any appropriate laser can be used as long as the above laminate can be cut. A laser capable of emitting light having a wavelength in the range of 193nm to 10.6 μm is preferably used. Specific examples thereof include CO2Gas lasers such as lasers and excimer lasers, solid-state lasers such as YAG lasers, and semiconductor lasers. Preference is given to using CO2A laser. The conditions for irradiating the laser beam during dicing may be set to any appropriate conditions depending on, for example, the laser used. In the use of CO2In the case of a laser, the power condition is, for example, 0.1W to 250W.
The laser ablation described above may be performed in any suitable pattern. As the laser used for the laser ablation, any appropriate laser may be used. As a specific example, the same laser as that used in the dicing may be mentioned. In the laser ablation, the irradiation conditions (power conditions, moving speed, and number of times) of the laser beam may be any appropriate conditions depending on the material for forming the adhesive film (substantially the resin film and the adhesive layer), the thickness of the adhesive film, the planar shape of the through-hole, the area of the through-hole, and the like.
Preferably, the abutment member is brought into contact with one side of the laminate when the laminate is cut. Specifically, the abutment member is brought into contact with the surface of the laminate on the terminal side in the cutting direction. By using the abutment material, the punching debris can be removed simultaneously also when peeling the abutment material from the laminated body after cutting. Specifically, the abutment material may be peeled off from the laminated body in a state where the punching debris adheres to the abutment material. As a result, productivity can be improved particularly when a plurality of through holes are formed in the laminate. In addition, by using the abutment material, the deformation of the laminated body due to dicing can be suppressed. In the case of cutting with, for example, a dicing blade, deformation of the adhesive layer can be particularly suppressed.
In a preferred embodiment, the through-hole is formed by cutting from the surface of the laminate to the middle of the contact member. According to such an aspect, the through-hole integrally penetrating the resin film and the adhesive layer (and the separator, if present) can be preferably formed. Further, the punching debris can be satisfactorily removed when the contact material is peeled off from the laminate.
As the contact material, a polymer film is preferably used. As the polymer film, the same film as the resin film described above can be used. In addition, a soft (e.g., low elastic modulus) film such as a polyolefin (e.g., polyethylene) film can also be used. In 1 embodiment, a film having a high hardness (e.g., elastic modulus) is preferably used as the polymer film. This is because the deformation of the laminate due to dicing can be favorably suppressed. The thickness of the polymer film is preferably 20 μm to 100. mu.m.
Preferably, the abutment material is bonded to the laminate with an adhesive. By adhering the contact material to the laminate, it is possible to prevent problems such as misalignment of the contact material during dicing. Further, the punching debris can be satisfactorily removed when the contact material is peeled off from the laminate. As the adhesive for adhering the contact material, any appropriate adhesive may be used as long as it has an adhesive force with which the contact material can be peeled off from the laminate after dicing. In 1 embodiment, an adhesive layer is formed on the contact material in advance. The thickness of the pressure-sensitive adhesive layer formed on the contact material is preferably 1 μm to 50 μm.
In the 1 embodiment, the shape of the abutment member is preferably made to correspond to the shape of the laminate. For example, a longitudinally long laminate is used as the longitudinally long abutment member. With such a shape, the punching debris can be satisfactorily removed when the contact material is peeled off from the laminate. In addition, when a plurality of through holes are formed in the laminate, the punched chips can be continuously removed, and productivity can be remarkably improved.
Preferably, the through-hole is formed by cutting from the separator side of the laminate. By cutting from the separator side, the influence on the adhesion of the adhesive film obtained by cutting can be suppressed. Specifically, when dicing is performed with a dicing blade, the adhesive layer of the laminate can deform following the dicing blade. When the adhesive film is cut from the resin film side, the adhesive layer may bulge toward the adhesive surface side of the obtained adhesive film, and a bulge portion may be formed at the periphery of the through hole. As a result, when the obtained adhesive film is adhered to an adherend, bubbles can be generated around the through-hole. On the other hand, when the separator is cut from the separator side, the adhesive layer can be deformed following the cutting blade, but the peripheral edge of the adhesive surface side of the through hole of the obtained adhesive film is in a smooth state (for example, a circular arc surface), and even when the adhesive film is adhered to an adherend, the generation of air bubbles can be prevented. Further, by performing the dicing from the separator side, when the contact material is used, the punched chips can be favorably removed when the contact material is peeled from the laminate after the dicing. It is possible to prevent such a problem that, for example, only a part of the punching debris (typically, the separator part) is removed.
The arrangement pattern (formation pattern) of the through holes can be appropriately set according to the purpose. Fig. 1A is a schematic plan view illustrating one example of the arrangement pattern of through holes in an adhesive film produced by the production method according to the embodiment of the present invention, fig. 1B is a schematic plan view illustrating another example of the arrangement pattern of through holes, and fig. 1C is a schematic plan view illustrating still another example of the arrangement pattern of through holes. For example, as shown in fig. 1A, the through holes 30 may be arranged at substantially equal intervals along any one of the longitudinal direction and the width direction of the prepared adhesive film 100. Further, "substantially equal intervals in either one of the longitudinal direction and the width direction" means that the intervals in the longitudinal direction are equal intervals and the intervals in the width direction are equal intervals, and it is not necessary that the intervals in the longitudinal direction and the intervals in the width direction are equal. For example, when the longitudinal interval is L1 and the width interval is L2, L1 may be L2, or L1 may be L2. Alternatively, the through holes may be arranged at substantially equal intervals along the longitudinal direction and at different intervals along the width direction; the substrates may be arranged at different intervals in the longitudinal direction and at substantially equal intervals in the width direction (both not shown). When the through holes are arranged at different intervals in the longitudinal direction or the width direction, the intervals between the adjacent through holes may be different entirely or only partially (the interval between specific adjacent through holes). In addition, a plurality of regions may be defined in the longitudinal direction of the adhesive film, and the intervals of the through holes in the longitudinal direction and/or the width direction may be set in each region.
In addition, in 1 embodiment, as shown in fig. 1A, the through-holes 30 may be arranged such that a straight line connecting through-holes adjacent in the longitudinal direction is substantially parallel to the longitudinal direction, and a straight line connecting through-holes adjacent in the width direction is substantially parallel to the width direction. In another embodiment, as shown in fig. 1B, the through-holes 30 are arranged such that a straight line connecting through-holes adjacent in the longitudinal direction is substantially parallel to the longitudinal direction, and a straight line connecting through-holes adjacent in the width direction has a predetermined angle θ with respect to the width directionW. In another embodiment, as shown in fig. 1C, the through-holes 30 are arranged such that a straight line connecting through-holes adjacent in the longitudinal direction has a predetermined angle θ with respect to the longitudinal directionLAnd a straight line connecting the through holes adjacent in the width direction has a predetermined angle theta with respect to the width directionW。θLAnd/or thetaWPreferably more than 0 ° and ± 10 ° or less. Here, "+/-" means to include the direction relative to the reference direction (longitudinal direction or width direction)To) in either of a clockwise and counterclockwise direction. The embodiments shown in fig. 1B and 1C have the following advantages: as described later, the adhesive film produced by the production method of the present invention can be used for producing a polarizing plate having a non-polarizing portion as one of applications. By using the adhesive film produced by the production method of the present invention, the non-polarizing portion can be formed in a desired pattern (a pattern corresponding to the arrangement pattern of the through holes) while the polarizing plate in a longitudinal shape is rolled and conveyed. As a result, the arrangement pattern can be precisely controlled over the entire longitudinal polarizing plate, and the non-polarizing portion can be formed. Here, depending on the image display device, it is sometimes required to dispose the absorption axis of the polarizing plate at a position shifted by about 10 ° at most from the long side or short side of the device in order to improve display characteristics. Since the absorption axis of the polarizing plate is oriented in the longitudinal direction or the width direction, when the non-polarizing portion is formed by using the adhesive film having the pattern shown in fig. 1B and 1C, the positional relationship between the non-polarizing portion and the absorption axis can be uniformly controlled over the entire longitudinal polarizing plate, and a final product having excellent axis accuracy (and thus excellent optical characteristics) can be obtained. Therefore, the directions of the absorption axes of the individual cut polarizers (for example, cut or punched in the longitudinal direction and/or the width direction) can be precisely controlled to a desired angle, and the deviation of the directions of the absorption axes of the individual polarizers can be significantly suppressed. It is to be noted that the arrangement pattern of the through holes is not limited to the illustrated example. For example, the through-holes 30 may be arranged such that a straight line connecting through-holes adjacent in the longitudinal direction has a predetermined angle θ with respect to the longitudinal directionLAnd a straight line connecting the through holes adjacent in the width direction is substantially parallel to the width direction. In addition, a plurality of regions may be defined in the longitudinal direction of the adhesive film 100, and θ may be set in each regionLAnd/or thetaW。
By appropriately configuring the through-hole forming means, the through-holes can be formed in a desired arrangement pattern. In the case of using the punching device, by arranging a plurality of cutting blades in a predetermined pattern, through-holes can be formed in a pattern corresponding to the arrangement pattern of the cutting blades. In the case of using an apparatus such as an XY plotter, punching is performed while moving a cutter blade attached to the plotter in XY directions (two-dimensional directions), and as a result, by controlling the movement pattern in the XY directions, through holes can be formed in a desired arrangement pattern. In the case of forming the through holes by laser ablation, the through holes can be formed in a desired arrangement pattern by controlling the movement pattern of the laser light source as in the case of the XY plotter. In the case of using chemical dissolution, a mask having openings of a predetermined pattern is laminated on both sides of an adhesive film, and the adhesive film is brought into contact with a treatment liquid, whereby through holes can be formed in a pattern corresponding to the arrangement pattern of the openings.
The shape of the through-hole 30 in plan view may be any appropriate shape according to the purpose. Specific examples thereof include a circle, an ellipse, a square, a rectangle, and a rhombus. By appropriately configuring the through-hole forming means, a through-hole having a desired plan view shape can be formed. When a punching device or an XY plotter is used, a through hole having a shape in plan view corresponding to the shape of the cutting blade can be formed. When forming the through hole by laser ablation, a desired planar shape of the through hole can be formed by adjusting the scanning pattern of the laser. When chemical dissolution is used, a through hole having a shape in a plan view corresponding to the shape of the opening of the mask can be formed.
As described above, an adhesive film having a longitudinal shape and through holes in a predetermined arrangement pattern can be obtained.
C. Use of the adhesive film obtained
The adhesive film produced by the production method according to the embodiment of the present invention can be suitably used as a surface protective film or a mask when a predetermined portion of a film (typically, a longitudinal film) is selectively treated. Specific examples of the selective treatment include decoloring, coloring, perforating, developing, etching, patterning (for example, formation of an active energy ray-curable resin layer), chemical modification, and heat treatment. By using such an adhesive film, continuous processing can be performed while roll conveying is performed, and therefore, the processing efficiency of various selective processes can be made extremely high. Further, by using such an adhesive film, since the portion to be selectively processed can be precisely controlled and arranged over the entire longitudinal film, when a final product having a predetermined size is cut from the longitudinal film, variation in quality can be remarkably suppressed for each final product. In 1 embodiment, the adhesive film can be used for manufacturing a polarizing plate having a non-polarizing portion (typically, a polarizing plate having a longitudinal shape). By using the adhesive film for this purpose, a multifunctional and highly functional polarizing plate suitable for electronic devices such as image display devices can be produced at low cost, with high yield and with high productivity. Hereinafter, the production of a polarizing plate having a non-polarizing portion will be specifically described as a representative example of the above-described selective process.
D. Production of polarizing plate having non-polarizing portion
D-1. Polarizing plate
As the polarizing plate that can form the non-polarizing portion, any appropriate polarizing plate can be used. The polarizing plate is typically made of a resin film. Typically, the resin film is a polyvinyl alcohol resin film containing a dichroic material (hereinafter referred to as "PVA resin"). The polarizing plate may be a single film or may be a resin layer (typically, PVA-based resin layer) formed on a resin substrate. The laminate of the resin base material and the resin layer can be obtained, for example, by a method of applying a coating liquid containing the above-described material for forming a resin film to the resin base material, a method of laminating a resin film on the resin base material, or the like.
Examples of the dichroic substance include iodine and an organic dye. These may be used alone, or two or more of them may be used in combination. Iodine is preferably used. This is because, when the unpolarized portion is formed by decolorization by chemical treatment using the adhesive film of the present invention, the iodine complex contained in the resin film (polarizing plate) is appropriately reduced, and therefore, the unpolarized portion having appropriate characteristics can be formed.
As the PVA-based resin, any appropriate resin can be used. Examples thereof include polyvinyl alcohol and ethylene-vinyl alcohol copolymers. Polyvinyl alcohol can be obtained by saponifying polyvinyl acetate. The ethylene-vinyl alcohol copolymer can be obtained by saponifying an ethylene-vinyl acetate copolymer. The saponification degree of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. The degree of saponification can be determined in accordance with JIS K6726-. By using a PVA-based resin having such a saponification degree, a polarizing plate having excellent durability can be obtained. If the degree of saponification is too high, gelation may occur.
The average polymerization degree of the PVA-based resin can be appropriately selected according to the purpose. The average polymerization degree is usually 1000 to 10000, preferably 1200 to 4500, and more preferably 1500 to 4300. The average polymerization degree can be determined in accordance with JIS K6726-1994.
The polarizing plate preferably exhibits absorption dichroism at any one of wavelengths 380nm to 780 nm. The monomer transmittance (Ts) of the polarizing plate (excluding the non-polarizing portion) is preferably 39% or more, more preferably 39.5% or more, further preferably 40% or more, and particularly preferably 40.5% or more. The theoretical upper limit of the monomer transmittance is 50%, and the practical upper limit is 46%. The monomer transmittance (Ts) is a value Y corrected for visibility by measurement in a field of view of 2 degrees (C light source) according to JIS Z8701, and can be measured using, for example, a micro spectroscopic system (LVmicro, manufactured by ラムダビジョン). The degree of polarization of the polarizing plate is preferably 99.9% or more, more preferably 99.93% or more, and still more preferably 99.95% or more.
The thickness of the polarizing plate can be set to any appropriate value. The thickness is preferably 30 μm or less, more preferably 25 μm or less, further preferably 20 μm or less, and particularly preferably less than 10 μm. On the other hand, the thickness is preferably 0.5 μm or more, and more preferably 1 μm or more. With such a thickness, a polarizing plate having excellent durability and optical characteristics can be obtained. Further, the thinner the thickness is, the more preferable the non-polarizing portion can be formed. In the case where the non-polarizing portion is formed by, for example, decoloring by chemical treatment, the contact time between the treatment liquid and the resin film (polarizing plate) can be shortened.
The absorption axis of the polarizing plate may be set to any appropriate direction according to the purpose. The direction of the absorption axis may be, for example, the longitudinal direction or the width direction. A polarizing plate having an absorption axis along the longitudinal direction has an advantage of excellent manufacturing efficiency. A polarizing plate having an absorption axis in the width direction has an advantage that a retardation film having a slow axis in the longitudinal direction can be laminated in a so-called roll-to-roll manner.
The polarizer may be made by any suitable method. When the polarizing plate is a single PVA-based resin film, the polarizing plate can be produced by a conventional method well known in the art. When the polarizing plate is a PVA-based resin layer formed on a resin substrate, the polarizing plate can be produced by, for example, the method described in japanese patent application laid-open No. 2012-73580. The entire disclosure of this publication is incorporated herein by reference.
The polarizing plate is provided in any appropriate form for forming a non-polarizing portion described later. Specifically, the polarizing plate provided in the non-polarizing portion may be a single PVA-based resin film, a laminate of a resin substrate and a PVA-based resin layer, or a laminate (i.e., a polarizing plate) in which a protective film is disposed on one side or both sides of the PVA-based resin film or the PVA-based resin layer. The polarizing plate provided in the non-polarizing section may have an adhesive layer so as to be attachable to the image display device. The polarizing plate may further have any appropriate optical functional layer according to the purpose. Typical examples of the optical functional layer include a retardation film (optical compensation film) and a surface treatment layer. Hereinafter, a case where a non-polarizing portion is formed in a polarizing plate having a structure of a polarizing plate/protective layer will be described as an example.
D-2. Formation of unpolarized portions
As shown in fig. 2, the adhesive film 100 is bonded to the surface of the polarizing plate 200 on the polarizer side by roll-to-roll bonding. The adhesive film 100 is an adhesive film produced by the production method of the present invention described in the above items a to C. In the illustrated example, the arrangement pattern of the through holes in the adhesive film corresponds to the arrangement pattern of fig. 1A. In the present specification, "roll-to-roll" means that films in a roll form are stacked while being conveyed so that the longitudinal directions of the films are aligned with each other. Typically, the adhesive film is releasably adhered to the polarizer. By using the adhesive film produced by the production method of the present invention, a non-polarizing portion can be formed by a decoloring treatment in which the adhesive film is immersed in a decoloring liquid, and therefore, a polarizing plate having a non-polarizing portion can be obtained with very high production efficiency. Further, since the adhesive film can function as a surface protective film of a polarizing plate in decoloring treatment, the adhesive film may be referred to as a 1 st surface protective film for convenience. Here, the surface protective film is a film that temporarily protects the polarizing plate during operation and can be peeled off at an arbitrary appropriate timing, and is different from a polarizer protective film, which is simply referred to as a protective film.
When the polarizing plate and the adhesive film are laminated on each other in a roll-to-roll manner, the adhesive film may be wound up from a vertically long adhesive film in a roll form and then laminated on the polarizing plate, or the adhesive film may be obtained by forming a through hole in the laminate and then continuously laminated (without winding up the adhesive film) on the polarizing plate.
On the other hand, a surface protective film (2 nd surface protective film) is bonded to the surface of the polarizing plate on the protective film side (not shown) by roll-to-roll. The 2 nd surface protective film may be releasably adhered to the polarizer protective film by any appropriate adhesive. By using the 2 nd surface protective film, the polarizing plate (polarizer/protective film) can be appropriately protected in the decoloring treatment by immersion. The 2 nd surface protective film may be the same film as the adhesive film (1 st surface protective film) obtained in the present invention, except that no through-hole is provided. As the 2 nd surface protective film, a soft (e.g., low elastic modulus) film such as a polyolefin (e.g., polyethylene) film can also be used. The 2 nd surface protective film may be bonded to the 1 st surface protective film at the same time, may be bonded before the 1 st surface protective film is bonded, or may be bonded after the 1 st surface protective film is bonded. Preferably, the 2 nd surface protective film is bonded before the 1 st surface protective film is bonded. In this order, there are advantages in that damage to the protective film can be prevented and transfer of the through-hole of the adhesive film to the protective film as a trace can be prevented during winding. The form in which the 2 nd surface protective film is bonded before the 1 st surface protective film is bonded can be suitably applied to, for example, a case in which the polarizing plate is a PVA-based resin layer formed on a resin substrate. Specifically, a laminate of a polarizer protective film and a 2 nd surface protective film can be produced, and after the laminate is bonded to a resin substrate/polarizer laminate, the resin substrate can be peeled off, and the 1 st surface protective film can be bonded to the peeled surface.
Next, as shown in fig. 3, the laminate of 1 st surface protective film/polarizing plate/protective film/2 nd surface protective film was subjected to a chemical decoloring treatment. Typically, the chemical decolorization treatment includes contacting the stack with a decolorizing solution (e.g., an alkaline solution). The chemical decoloring treatment may further include the following as necessary: removing the alkaline solution; contacting the laminate with an acidic solution; and removing the acidic solution. The following description will be specifically made.
The contact between the laminate and the alkaline solution may be performed by any appropriate means. Typical examples include immersion of the laminate in an alkaline solution, or application or spraying of an alkaline solution to the laminate. Impregnation is preferred. This is because the laminate can be decolorized while being transported as shown in fig. 3, and therefore, the manufacturing efficiency is significantly improved. As described above, by using the 1 st surface protective film (and the 2 nd surface protective film as necessary), impregnation can be performed. Specifically, by immersing in an alkaline solution, only the portion of the polarizing plate corresponding to the through-hole of the 1 st surface protective film is brought into contact with the alkaline solution. For example, when the polarizing plate contains iodine as a dichroic material, the iodine concentration in the contact portion of the polarizing plate with the alkaline solution is reduced by bringing the polarizing plate into contact with the alkaline solution, and as a result, the non-polarizing portion can be selectively formed only in the contact portion (which can be set by the through-hole). As described above, according to the present embodiment, the non-polarizing portion can be selectively formed in a predetermined portion of the polarizing plate with a very high manufacturing efficiency without involving complicated operations. In addition, when iodine remains in the polarizing plate, even if the iodine complex is broken to form the non-polarizing portion, the iodine complex is formed again with the use of the polarizing plate, and the non-polarizing portion may not have the desired characteristics. In this embodiment, iodine itself is removed from the polarizing plate (substantially from the non-polarizing portion) by the removal of an alkaline solution described later. As a result, the characteristics of the non-polarizing portion can be prevented from changing with the use of the polarizing plate.
The formation of the non-polarizing portion using an alkaline solution is described in more detail. The alkaline solution penetrates into a predetermined portion of the polarizing plate after contacting the predetermined portion. The iodine complex contained in the predetermined portion is reduced by the base contained in the alkaline solution to be iodide ions. The iodine complex is reduced to iodide ions, whereby the polarization performance of the portion is substantially lost, and a non-polarizing portion is formed in the portion. In addition, the transmittance of the portion is improved by the reduction of the iodine complex. Iodine that becomes iodide ions moves from the portion into the solvent of the alkaline solution. As a result, iodine ions are also removed from the part together with the alkaline solution by the removal of the alkaline solution described later. In this way, the non-polarized portion is selectively formed in a predetermined portion of the polarizing plate, and the non-polarized portion becomes a stable portion that does not change with time. Further, by adjusting the material, thickness, and mechanical properties of the adhesive film (more specifically, the resin film and the adhesive layer), the concentration of the alkaline solution, the immersion time of the laminate into the alkaline solution, and the like, it is possible to prevent the alkaline solution from penetrating into an undesired portion (as a result, a non-polarized portion is formed in the undesired portion).
As the basic compound contained in the basic solution, any appropriate 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, and aqueous ammonia. The alkaline compound contained in the alkaline solution is preferably a hydroxide of an alkali metal, and more preferably sodium hydroxide, potassium hydroxide, or lithium hydroxide. By using an alkaline solution containing an alkali metal hydroxide, the iodine complex can be efficiently ionized, and the unpolarized portion can be formed more easily. These basic compounds may be used alone or in combination of two or more.
As the solvent of the alkaline solution, any appropriate solvent can be used. Specific examples thereof include water, alcohols such as ethanol and methanol, ethers, benzene, chloroform, and mixed solvents thereof. The solvent is preferably water or alcohol because iodine ions are favorably transferred to the solvent and can be easily removed by the subsequent removal of the alkaline solution.
The concentration of the alkaline solution is, for example, 0.01N to 5N, preferably 0.05N to 3N, and more preferably 0.1N to 2.5N. When the concentration of the alkaline solution is within such a range, the iodine concentration in the polarizing plate can be efficiently reduced, and ionization of the iodine complex in a portion other than the predetermined portion can be prevented.
The liquid temperature of the alkaline solution is, for example, 20 to 50 ℃. The contact time between the laminate (substantially, a predetermined portion of the polarizing plate) and the alkaline solution can be set according to the thickness of the polarizing plate, the kind of the alkaline compound contained in the alkaline solution used, and the concentration of the alkaline compound, and is, for example, 5 seconds to 30 minutes.
The alkaline solution may be removed by any appropriate means as needed after contacting a predetermined portion of the polarizing plate. Specific examples of the method for removing the alkaline solution include washing, wiping with a rag or the like, suction removal, natural drying, heat drying, air drying, and reduced-pressure drying. Cleaning is preferred. This is because the alkaline solution has excellent removal performance, does not require a complicated apparatus, and has excellent production efficiency. Examples of the liquid used for the washing include water (pure water), alcohols such as methanol and ethanol, acidic aqueous solutions, and mixed solvents thereof. Water is preferred. Typically, the laminate may be cleaned while being transported as shown in fig. 3. Multiple cleanings may also be performed. The drying temperature in the case of removing the alkaline solution by drying is, for example, 20 to 100 ℃.
The laminate (substantially, a predetermined portion of the polarizing plate) after being contacted with the alkaline solution can be further contacted with an acidic solution as necessary. The laminate can be contacted with the acidic solution by any appropriate means. Impregnation is preferred as in the case of contact with an alkaline solution. By contacting with the acidic solution, the alkaline solution remaining in the non-polarizing portion can be further removed to a satisfactory level. In addition, the dimensional stability and durability of the non-polarizing portion can be improved by contacting with an acidic solution. The contact with the acidic solution may be performed after the removal of the alkaline solution, or may be performed without removing the alkaline solution.
As the acidic compound contained in the acidic solution, any appropriate acidic compound can be used. Examples of the acidic compound include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, and hydrogen fluoride, 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, and more preferably hydrochloric acid, sulfuric acid, or nitric acid. These acidic compounds may be used alone or in combination.
As the solvent of the acidic solution, the solvents exemplified as the solvent of the basic solution can be used. The concentration of the acidic solution is, for example, 0.01N to 5N, preferably 0.05N to 3N, and more preferably 0.1N to 2.5N.
The liquid temperature of the acidic solution is, for example, 20 to 50 ℃. The contact time between the laminate (substantially, a predetermined portion of the polarizing plate) and the acidic solution can be set according to the thickness of the resin film (polarizing plate), the type of the acidic compound contained in the acidic solution used, and the concentration of the acidic compound, and is, for example, 5 seconds to 30 minutes. If necessary, the laminate may be removed by wiping or the like immediately after contacting the laminate with an acidic solution.
The above-mentioned acidic solution may be removed by any appropriate means as needed after contacting with a predetermined portion of the polarizing plate. The cleaning is preferable as in the case of the removal of the alkaline solution. Examples of the liquid used for the washing include water (pure water), alcohols such as methanol and ethanol, acidic aqueous solutions, and mixed solvents thereof. Water is preferred. Typically, the laminate may be cleaned while being transported as shown in fig. 3. Multiple cleanings may also be performed.
In the present embodiment, in the case of removing the acidic solution by washing, the laminate after the removal of the acidic solution may be subjected to washing liquid removal and drying (not shown) as needed. The cleaning liquid (typically, water) can be removed by any appropriate means. Specific examples thereof include blowing by a blower, passing the laminate through a sponge roll, and combinations thereof. By removing the cleaning liquid, the cleaning liquid remaining in the through-hole portion of the 1 st surface protective film can be further removed to a satisfactory level, and therefore, the residual cleaning liquid can be prevented from adversely affecting the polarizing plate. Drying can be performed by conveying the laminate in, for example, a dryer. The drying temperature is, for example, 20 to 100 ℃ and the drying time is, for example, 5 to 600 seconds.
Typically, after the non-polarizing portion is formed as described above, the adhesive film (1 st surface protective film) and the 2 nd surface protective film may be peeled off and removed.
By setting the arrangement pattern of the through holes of the adhesive film as described above, the non-polarizing portion can be formed in a predetermined arrangement pattern at a predetermined position of the vertically long polarizing plate. The polarizing plate having a non-polarizing portion can be used for, for example, an image display device having a camera portion.
Typically, the non-polarizing portion is disposed at a position corresponding to a camera portion of an image display device when the polarizing plate is cut to a predetermined size for attaching the polarizing plate to the image display device having the predetermined size. Therefore, when only the polarizing plate of 1 size is cut from 1 vertically long polarizing plate, the non-polarizing portions may be arranged at substantially equal intervals in both the vertical direction and the width direction, as shown in fig. 1A. With such a configuration, it is easy to control the predetermined size of the polarizing plate cut in accordance with the size of the image display device, and the yield can be improved. Further, since the position of the non-polarizing portion can be accurately set, the position of the non-polarizing portion in the obtained polarizing plate having a predetermined size can be also controlled favorably. As a result, the obtained polarizing plate of the predetermined size can be obtained without quality variation because the deviation of the position of the non-polarizing portion is small for each polarizing plate of the predetermined size. When polarizing plates of a plurality of sizes are cut from 1 long polarizing plate, the interval between the non-polarizing portions in the longitudinal direction and/or the width direction can be changed according to the size of the polarizing plate to be cut. As described above, by appropriately setting the arrangement pattern of the through holes in the adhesive film, the non-polarizing portion can be formed in a desired arrangement pattern.
The non-polarizing portion preferably has a transmittance (transmittance measured by light having a wavelength of 550nm at 23 ℃) of 50% or more, more preferably 60% or more, still more preferably 75% or more, and particularly preferably 90% or more. If the transmittance is such, desired transparency as the non-polarizing portion can be secured. As a result, when the polarizing plate is disposed so that the non-polarizing portion corresponds to the camera portion of the image display device, adverse effects on the imaging performance of the camera can be prevented.
The content of the non-polarizing dichroic material is preferably 1.0 wt% or less, more preferably 0.5 wt% or less, and still more preferably 0.2 wt% or less. The content of the non-polarizing dichroic material in the non-polarizing portion can sufficiently satisfy the above transmittance within such a range.
The shape of the non-polarizing portion in plan view may be any appropriate shape as long as it does not adversely affect the camera performance of the image display device using the polarizing plate. By appropriately setting the shape of the through-hole in the adhesive film, it is possible to form the non-polarizing portion having a desired planar shape.
Although the formation of the non-polarizing portion in the long polarizing plate has been described as an example of the selective treatment of the predetermined portion of the long adhesive film obtained by the production method of the present invention, it is clear to those skilled in the art that the adhesive film can be applied to the above-described other selective treatments in a similar order.
Examples
[ example 1]
An elongated laminate (width: 1200mm, length: 43m) having a structure of a lipid film (thickness: 38 μm)/an adhesive layer (thickness: 5 μm)/a separator (thickness: 25 μm) was prepared. A carrier film (width: 1200mm, length: 43m) having a structure of a resin film (thickness: 38 μm)/an adhesive layer (thickness: 5 μm) was bonded to the resin film surface of the laminate by roll-to-roll to prepare a laminate with a carrier film.
Next, a dicing blade was cut into the laminate with the carrier film by a punching device to a depth of 80 μm from the separator surface, and the laminate was half-cut into a circular shape having a diameter of 2.4mm so that the carrier film did not penetrate. Half-cuts were made every 250mm in the lengthwise direction and every 400mm in the widthwise direction.
Next, the carrier film was peeled from the laminate to obtain an adhesive film.
[ example 2]
Except using laser Cutters (CO)2Laser, wavelength: 9.4 μm, power: 10W) instead of the punching device, half cutting (cutting depth: 80 μm), an adhesive film was obtained in the same manner as in example 1.
The following evaluations were made for each example.
1. Perforation debris
It was confirmed whether or not the perforation debris generated by cutting was removed when peeling the carrier film.
2. Adhesive appearance of adhesive film
The separator was peeled off, and the adhesive film was adhered to a commercially available polarizing plate, and the appearance thereof was observed with a microscope.
In various embodiments, the perforation debris resulting from the half-cut is completely removed upon peeling the carrier film.
The obtained adhesive film was adhered to a polarizing plate, and the adhesion state between the polarizing plate and the adhesive film was observed, and as a result, it was confirmed that air bubbles were not mixed between the polarizing plate and the adhesive film as shown in fig. 4.
[ TABLE 1]
| Cutting method | Direction of cutting | Adhesive appearance | |
| Example 1 | Blanking device | Spacer side | No air bubbles being mixed in |
| Example 2 | Laser irradiation | Spacer side | No air bubbles being mixed in |
[ production of polarizing plate ]
As the substrate, an amorphous ethylene isophthalate copolymer terephthalate (IPA copolymer PET) film (thickness: 100 μm) having a longitudinal shape, a water absorption of 0.75% and a Tg of 75 ℃ was used. Corona treatment of one side of the substrate will be performed at a ratio of 9: an aqueous solution containing polyvinyl alcohol (polymerization degree: 4200, saponification degree: 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree: 1200, acetoacetyl-modified degree: 4.6%, saponification degree: 99.0 mol% or more, manufactured by japan synthetic chemical industries, ltd., trade name "ゴーセファイマー Z200") at a ratio of 1 was applied to the corona-treated surface at 25 ℃ and the aqueous solution was dried to form a PVA-based resin layer having a thickness of 11 μm, thereby producing a laminate.
The obtained laminate was uniaxially stretched (in-air assisted stretching) at the free end in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in a dryer at 120 ℃ by a factor of 2.0.
Next, the laminate was immersed in an insolubilization bath (aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid and 100 parts by weight of water) having a liquid temperature of 30 ℃ for 30 seconds (insolubilization treatment).
Next, the laminate was immersed in a dyeing bath having a liquid temperature of 30 ℃ while adjusting the iodine concentration and immersion time so that the polarizing plate had a predetermined transmittance. In this example, an aqueous iodine solution was obtained by mixing 0.2 parts by weight of iodine with 100 parts by weight of water and further mixing 1.5 parts by weight of potassium iodide, and the laminate was immersed in the aqueous iodine solution for 60 seconds (dyeing treatment).
Next, the laminate was immersed in a crosslinking bath (aqueous boric acid solution prepared by mixing 3 parts by weight of potassium iodide with 100 parts by weight of water and further mixing 3 parts by weight of boric acid) having a liquid temperature of 30 ℃ for 30 seconds (crosslinking treatment).
Thereafter, the laminate was immersed in an aqueous boric acid solution (an aqueous solution prepared by mixing 100 parts by weight of water with 4 parts by weight of boric acid and 5 parts by weight of potassium iodide) having a liquid temperature of 70 ℃ and uniaxially stretched (underwater stretched) in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds so that the total draw ratio was 5.5 times.
Thereafter, the laminate was immersed in a cleaning bath (an aqueous solution prepared by mixing 4 parts by weight of potassium iodide and 100 parts by weight of water) having a liquid temperature of 30 ℃ (cleaning treatment).
Then, an aqueous solution of a PVA resin (trade name "ゴーセファイマー (registered trade name) Z-200", manufactured by Nippon synthetic chemical industries, Ltd., resin concentration: 3% by weight) was applied to the surface of the PVA resin layer of the laminate to adhere a protective film (thickness: 25 μm), and the resultant was heated for 5 minutes in a dryer maintained at 60 ℃. Thereafter, the substrate was peeled off from the PVA resin layer, and a polarizing plate (width: 1200mm, length: 43m) having a polarizer with a transmittance of 42.3% and a thickness of 5 μm was obtained.
[ formation of transparent portion ]
The adhesive film obtained in each example was adhered to the polarizing plate side of the obtained polarizing plate by roll-to-roll after peeling the separator, to obtain a polarizing film laminate.
An aqueous solution of sodium hydroxide (1.0mol/L (1.0N)) at normal temperature was dropped onto the exposed portion of the polarizing plate of the polarizing film laminate thus obtained, and the laminate was left for 60 seconds. After that, the dropped sodium hydroxide aqueous solution was removed with a rag, and the adhesive film was peeled off to obtain a polarizing plate (polarizing plate) having a transparent portion formed thereon.
The following measurement was performed on the transparent part formed using the adhesive film of each example.
1. Transmittance (Ts)
The measurement was carried out using a spectrophotometer (product name "DOT-3" manufactured by COLOUR TECHNOLOGY KIRCHALS, CORPORATION CO., LTD.). The transmittance (T) is a Y value obtained by performing visibility correction using a 2-degree field of view (C light source) according to JIS Z8701-1982.
2. Iodine content
The iodine content in the transparent portion of the polarizing plate was determined by X-ray fluorescence analysis. Specifically, the iodine content of the polarizing plate was determined from the X-ray intensity measured under the following conditions and from a calibration curve prepared in advance using a standard sample.
An analysis device: x-ray fluorescence analyzer (XRF) manufactured by Shikoku Motor industries, Ltd., product name "ZSX 100 e"
For the cathode: rhodium
Spectroscopic crystallization: lithium fluoride
Excitation light energy: 40 kV-90 mA
Iodine assay line: I-LA
Quantitative method: FP method
2 θ angular peak: 103.078deg (iodine)
Measurement time: 40 seconds
Transparent portions having a transmittance of 93% to 94% and an iodine content of 0.15% by weight or less are formed, and these portions can function as non-polarizing portions. The non-polarizing portion was circular with a diameter of 2.4mm corresponding to the shape of the through hole of the adhesive film.
Industrial applicability
The adhesive film produced by the production method of the present invention can be suitably used as a surface protective film or a mask when a predetermined portion of a film (typically, a longitudinal film) is selectively treated.
Description of the reference numerals
30. A through hole; 100. an adhesive film; 200. a polarizing plate.
Claims (15)
1. A method for manufacturing a polarizing plate having a non-polarizing portion,
in the method for manufacturing the polarizing plate having the non-polarizing portion, an adhesive film prepared by the following manufacturing method is used:
preparing a longitudinal laminate having a longitudinal resin film and an adhesive layer provided on one surface of the resin film;
and through holes formed at predetermined intervals along the longitudinal direction and/or the width direction of the laminate, the through holes integrally penetrating the resin film and the adhesive layer,
in the method for producing a polarizing plate having a non-polarizing portion, the adhesive films produced by the above-described production method are bonded to a longitudinally long polarizing plate so that the longitudinal directions of the adhesive films are aligned, and a portion of the polarizing plate corresponding to the through-hole is treated.
2. The manufacturing method according to claim 1,
the through holes are formed at predetermined intervals along the longitudinal direction of the laminate.
3. The manufacturing method according to claim 1 or 2,
the through holes are formed at substantially equal intervals along at least the longitudinal direction of the laminate.
4. The manufacturing method according to claim 1 or 2,
the through holes are formed at substantially equal intervals along the longitudinal direction and the width direction of the laminate.
5. The manufacturing method according to claim 1 or 2,
the through-holes are formed in a dot pattern.
6. The manufacturing method according to claim 1 or 2,
the through-hole has a substantially circular shape or a substantially rectangular shape in plan view.
7. The manufacturing method according to claim 1 or 2,
the through-hole is formed by cutting with a cutter.
8. The manufacturing method according to claim 1 or 2,
the laminate further includes an elongated separator temporarily detachably fixed to the adhesive layer, and the through-hole is formed to integrally penetrate the resin film, the adhesive layer, and the separator.
9. The manufacturing method according to claim 8,
and cutting the laminate from the separator side to form the through-hole integrally penetrating the separator, the adhesive layer, and the resin film.
10. The manufacturing method according to claim 9,
the through-hole is formed in a state where the contact material is in contact with the resin film side of the laminate.
11. The manufacturing method according to claim 10,
the through hole is formed by cutting from the surface of the spacer to the middle of the contact member.
12. The manufacturing method according to claim 10 or 11,
the abutment member is elongated.
13. The manufacturing method according to claim 10 or 11,
the abutment material is bonded to the laminate with an adhesive.
14. The manufacturing method according to claim 10 or 11,
the manufacturing method further includes detaching the abutment material from the laminated body.
15. The manufacturing method according to claim 1 or 2,
the manufacturing method further includes: after the through-holes are formed, the laminate is wound into a roll.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
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| JP2014132638 | 2014-06-27 | ||
| JP2014-132638 | 2014-06-27 | ||
| JP2015-127640 | 2015-06-25 | ||
| JP2015127640A JP6181111B2 (en) | 2014-06-27 | 2015-06-25 | Manufacturing method of long adhesive film |
| PCT/JP2015/068500 WO2015199213A1 (en) | 2014-06-27 | 2015-06-26 | Method for producing long adhesive film |
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| Publication Number | Publication Date |
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| CN106661392A CN106661392A (en) | 2017-05-10 |
| CN106661392B true CN106661392B (en) | 2020-08-11 |
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| CN201580035090.0A Active CN106661392B (en) | 2014-06-27 | 2015-06-26 | Method for producing longitudinal adhesive film, method for producing film, and method for producing polarizing plate having non-polarizing portion |
Country Status (5)
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| JP (1) | JP6181111B2 (en) |
| KR (1) | KR101766575B1 (en) |
| CN (1) | CN106661392B (en) |
| TW (1) | TWI709633B (en) |
| WO (1) | WO2015199213A1 (en) |
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| KR101953171B1 (en) | 2014-03-26 | 2019-02-28 | 주식회사 엘지화학 | Preparing method for polarizer having locally depolarizied area, polarizer, polarizing plate and image display device manufactured by using the same |
| CN113667418B (en) * | 2015-06-25 | 2024-03-15 | 日东电工株式会社 | Method for producing adhesive film |
| KR20170058338A (en) * | 2017-05-08 | 2017-05-26 | 김봉식 | adhesive tape with cutouts |
| JP6951902B2 (en) * | 2017-08-07 | 2021-10-20 | 日東電工株式会社 | Manufacturing method of optical film with adhesive |
| WO2020040568A1 (en) * | 2018-08-22 | 2020-02-27 | 주식회사 엘지화학 | Mask film and method for manufacturing polarizing plate by using same |
| KR102239441B1 (en) * | 2018-08-22 | 2021-04-12 | 주식회사 엘지화학 | Method for preparing polarizing plate using mask film and polarizing plate same |
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2015
- 2015-06-25 JP JP2015127640A patent/JP6181111B2/en active Active
- 2015-06-26 TW TW104120913A patent/TWI709633B/en active
- 2015-06-26 WO PCT/JP2015/068500 patent/WO2015199213A1/en active Application Filing
- 2015-06-26 KR KR1020157036669A patent/KR101766575B1/en active IP Right Grant
- 2015-06-26 CN CN201580035090.0A patent/CN106661392B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2016027135A (en) | 2016-02-18 |
| JP6181111B2 (en) | 2017-08-16 |
| KR20160009072A (en) | 2016-01-25 |
| WO2015199213A1 (en) | 2015-12-30 |
| CN106661392A (en) | 2017-05-10 |
| TWI709633B (en) | 2020-11-11 |
| TW201610077A (en) | 2016-03-16 |
| KR101766575B1 (en) | 2017-08-08 |
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