WO2015199213A1 - 長尺状の粘着フィルムの製造方法 - Google Patents

長尺状の粘着フィルムの製造方法 Download PDF

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Publication number
WO2015199213A1
WO2015199213A1 PCT/JP2015/068500 JP2015068500W WO2015199213A1 WO 2015199213 A1 WO2015199213 A1 WO 2015199213A1 JP 2015068500 W JP2015068500 W JP 2015068500W WO 2015199213 A1 WO2015199213 A1 WO 2015199213A1
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WO
WIPO (PCT)
Prior art keywords
film
laminate
manufacturing
hole
polarizer
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PCT/JP2015/068500
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English (en)
French (fr)
Japanese (ja)
Inventor
尾込　大介
将寛 八重樫
中野　勇樹
宏太 仲井
雄基 大瀬
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to KR1020157036669A priority Critical patent/KR101766575B1/ko
Priority to CN201580035090.0A priority patent/CN106661392B/zh
Publication of WO2015199213A1 publication Critical patent/WO2015199213A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • C—CHEMISTRY; METALLURGY
    • 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

Definitions

  • the present invention relates to a method for producing a long adhesive film.
  • this invention relates to the manufacturing method of the elongate adhesive film which has the through-hole arrange
  • 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 and the like of such an image display device (for example, Patent Documents 1 to 7).
  • Patent Documents 1 to 7 For example, Patent Documents 1 to 7
  • smartphones and touch panel type information processing devices further improvements in camera performance and the like are desired.
  • a polarizing plate partially having polarization performance.
  • the present invention has been made to solve the above-described conventional problems, and its main purpose is a long shape that can be suitably used as a surface protective film or a mask when a predetermined portion of the long film is processed.
  • Another object of the present invention is to provide a method capable of producing a pressure-sensitive adhesive film at low cost and high productivity.
  • the method for producing a pressure-sensitive adhesive film of the present invention comprises preparing a long laminate having a long resin film and a pressure-sensitive adhesive layer provided on one surface of the resin film, and the laminate. Forming through holes that integrally penetrate the resin film and the pressure-sensitive adhesive layer at predetermined intervals in the longitudinal direction and / or the width direction. In one embodiment, the through holes are formed at predetermined intervals in the longitudinal direction of the laminate. In one embodiment, the through holes are formed at substantially equal intervals in at least the longitudinal direction of the laminate. In one embodiment, the through holes are formed at substantially equal intervals in the longitudinal direction and the width direction of the laminate. In one embodiment, the through hole is formed in a dot pattern.
  • the planar view shape of the said through-hole is a substantially circular shape or a substantially rectangular shape.
  • the formation of the through hole is performed by cutting with a cutting blade.
  • the laminate further includes a long separator temporarily attached to the pressure-sensitive adhesive layer in a peelable manner, and the manufacturing method includes the resin film, the pressure-sensitive adhesive layer, and the separator.
  • the through hole penetrating integrally is formed.
  • disconnects from the separator side of the said laminated body, and forms the said through-hole which penetrates the said separator, the said adhesive layer, and the said resin film integrally.
  • the through hole is formed in a state in which a patch is applied to the resin film side of the laminate.
  • the manufacturing method further includes removing the pad from the laminated body. In one embodiment, the manufacturing method further includes winding the laminated body into a roll after the formation of the through hole. According to another aspect of the present invention, a method for producing a film is provided.
  • the adhesive film obtained by the above production method is bonded to a long film so that the longitudinal directions of the films are aligned with each other, and the portion corresponding to the through hole of the film is selectively processed.
  • the manufacturing method of the polarizer which has a non-polarizing part is provided. This method uses an adhesive film obtained by the above production method.
  • a long pressure-sensitive adhesive film having through-holes arranged at predetermined intervals (that is, in a predetermined pattern) in the longitudinal direction and / or the width direction is manufactured at low cost and high productivity.
  • a method of obtaining is provided.
  • the pressure-sensitive adhesive film obtained by the production method of the present invention can be suitably used as, for example, a surface protective film or a mask when a predetermined portion of a film (typically, a long film) is selectively processed. .
  • a predetermined portion of a film typically, a long film
  • the manufacturing method of the adhesive film by embodiment of this invention prepares the elongate laminated body which has an elongate resin film and the adhesive layer provided in one surface of this resin film, and Forming through-holes integrally penetrating the resin film and the pressure-sensitive adhesive layer at predetermined intervals in the longitudinal direction and / or the width direction of the laminate. This will be specifically described below.
  • A. Resin film / adhesive layer laminate In the production method of the present invention, first, a long laminate comprising a long resin film and a pressure-sensitive adhesive layer provided on one surface of the resin film. Prepare.
  • the “elongate shape” means an elongated shape having a sufficiently long length with respect to the width, for example, an elongated shape having a length of 10 times or more, preferably 20 times or more with respect to the width. Including.
  • Resin film can function as a base material for the resulting adhesive film.
  • the resin film is preferably a film having high hardness (for example, elastic modulus). This is because the deformation of the through-hole during conveyance and / or bonding can be prevented.
  • resin film forming materials include ester resins such as polyethylene terephthalate resins, cycloolefin resins such as norbornene resins, olefin resins such as polypropylene, polyamide resins, polycarbonate resins, and copolymer resins thereof. Is mentioned. Preference is given to ester resins (especially polyethylene terephthalate resins). Such a material has an advantage that the elastic modulus is sufficiently high and deformation of the through-hole hardly occurs even when tension is applied during conveyance and / or bonding.
  • the thickness of the resin film is typically 20 ⁇ m to 250 ⁇ m, preferably 30 ⁇ m to 150 ⁇ m. With such a thickness, there is an advantage that deformation of the through hole hardly occurs even when tension is applied during conveyance and / or bonding.
  • the elastic modulus of the resin film is preferably 2.2 kN / mm 2 to 4.8 kN / mm 2 .
  • the elastic modulus is measured according to JIS K 6781.
  • the tensile elongation of the resin film is preferably 90% to 170%. If the tensile elongation of the resin film is in such a range, there is an advantage that it is difficult to break during transportation.
  • the tensile elongation is measured according to JIS K 6781.
  • any appropriate pressure-sensitive adhesive layer can be adopted as long as the effects of the present invention can be obtained.
  • the base resin for the pressure-sensitive adhesive include acrylic resins, styrene resins, and silicone resins. Acrylic resins are preferred from the viewpoints of chemical resistance, adhesion for preventing the treatment liquid from entering during immersion, flexibility in the adherend, and the like.
  • the crosslinking agent that can be included in the pressure-sensitive adhesive include isocyanate compounds, epoxy compounds, and aziridine compounds.
  • the pressure-sensitive adhesive may contain, for example, a silane coupling agent. The formulation of the pressure-sensitive adhesive can be appropriately set according to the purpose.
  • the pressure-sensitive adhesive layer can be formed by any appropriate method. Specific examples include a method of applying a pressure-sensitive adhesive solution on a resin film and drying, a method of forming a pressure-sensitive adhesive layer on a separator, and transferring the pressure-sensitive adhesive layer to the resin film. Examples of the coating method include roll coating methods such as reverse coating and gravure coating, spin coating methods, screen coating methods, fountain coating methods, dipping methods, and spray methods.
  • the thickness of the pressure-sensitive adhesive layer is preferably 1 ⁇ m to 60 ⁇ m, more preferably 3 ⁇ m to 30 ⁇ m. If the thickness is too thin, the adhesiveness becomes insufficient, and bubbles or the like may enter the adhesive interface. If the thickness is too thick, problems such as sticking out of the adhesive easily occur.
  • the laminate of the resin film / adhesive layer may further have a long separator temporarily attached to the adhesive layer in a peelable manner.
  • a separator has a function as a protective material which protects an adhesive film (adhesive layer) until it uses for practical use.
  • the pressure-sensitive adhesive film can be favorably wound into a roll shape.
  • a plastic for example, polyethylene terephthalate (PET), polyethylene, polypropylene
  • PET polyethylene terephthalate
  • a release agent such as a silicone release agent, a fluorine release agent, or a long-chain alkyl acrylate release agent
  • paper for example, paper.
  • the thickness of the separator is, for example, 10 ⁇ m to 100 ⁇ m.
  • the separator may be laminated on a resin film / adhesive layer laminate, or an adhesive layer may be formed on the separator, and the separator / adhesive laminate may be laminated on the resin film.
  • through-holes are formed in the laminate of the resin film / adhesive layer (/ separator as required).
  • the through hole integrally penetrates the resin film and the pressure-sensitive adhesive layer (and the separator, if present).
  • the through hole can be formed, for example, by cutting the laminate or removing a predetermined portion of the laminate (for example, laser ablation or chemical dissolution). Examples of the cutting method include a cutting blade (punching die) such as a Thomson blade and a picnal blade, a method of mechanically cutting using a water jet or the like, and a method of cutting by irradiating a laser beam.
  • the cutting with the cutting blade can be performed in any appropriate 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 may be performed by moving the cutting blades using a device such as an XY plotter. Thus, since the cutting blade can be moved and cut so as to correspond to a predetermined position of the laminated body, a through-hole can be formed with high accuracy at a desired position of the laminated body. In one embodiment, cutting with a cutting blade can be performed in conjunction with the conveyance appropriately while roll conveying a long laminate.
  • the through hole can be formed at a desired position of the laminate by appropriately adjusting the cutting timing and / or the moving speed of the cutting blade in consideration of the conveyance speed of the laminate.
  • the punching device may be a reciprocating method (flat driving) or a rotary method (rotating).
  • any appropriate laser can be adopted as long as the laminate can be cut.
  • a laser capable of emitting light having a wavelength in the range of 193 nm to 10.6 ⁇ m is used.
  • Specific examples include a gas laser such as a CO 2 laser and an excimer laser; a solid laser such as a YAG laser; and a semiconductor laser.
  • a CO 2 laser is used.
  • the irradiation condition of the laser beam can be set to any appropriate condition depending on the laser to be used, for example.
  • the output condition is, for example, 0.1 W to 250 W when a CO 2 laser is used.
  • the laser ablation is performed in any appropriate manner. Any appropriate laser can be adopted as the laser used for laser ablation. As a specific example, a laser similar to the laser used for the above-described cutting may be mentioned.
  • the irradiation conditions (output conditions, moving speed, number of times) of the laser light are the material for forming the adhesive film (substantially the resin film and the adhesive layer), the thickness of the adhesive film, and the plan view of the through hole Any appropriate condition can be adopted depending on the shape, the area of the through hole, and the like.
  • the contact material is applied to the surface of the laminate on the end side in the cutting direction.
  • the pad By using the pad, when the pad is peeled from the laminate after cutting, the perforated residue can be removed at the same time.
  • the contact material can be peeled from the laminated body with the perforated residue attached to the contact material.
  • productivity can be significantly improved.
  • disconnection can be suppressed by using a patch. For example, when cutting with a cutting blade, deformation of the adhesive layer can be particularly suppressed.
  • the through hole is formed by cutting from the surface of the laminate to the middle of the pad.
  • the through-hole which penetrates the said resin film and an adhesive layer (and a separator when it exists) integrally can be favorably formed.
  • perforated debris can be removed favorably.
  • a polymer film is preferably used.
  • a film similar to the resin film can be used.
  • a soft (eg, low elastic modulus) film such as a polyolefin (eg, polyethylene) film can also be used.
  • a film having high hardness 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 ⁇ m to 100 ⁇ m.
  • the patch is bonded to the laminate with an adhesive.
  • an adhesive By sticking the backing material to the laminate, it is possible to prevent problems such as shifting of the backing material during cutting. Moreover, when peeling off a patch from a laminated body, perforated debris can be removed favorably.
  • Any appropriate pressure-sensitive adhesive can be used as the pressure-sensitive adhesive to which the patch is bonded, as long as it has an adhesive force capable of peeling the patch from the laminate after cutting.
  • the adhesive layer is previously formed in the patch. The thickness of the pressure-sensitive adhesive layer formed on the patch is preferably 1 ⁇ m to 50 ⁇ m.
  • the shape of the pad material corresponds to the shape of the laminated body.
  • a long patch is used for a long laminate.
  • perforated debris can be satisfactorily removed when the patch is peeled from the laminate.
  • perforated debris can be removed continuously, and productivity can be significantly improved.
  • the through hole it is preferable to cut from the separator side of the laminate.
  • the influence on the bonding of the adhesive film obtained by cutting can be suppressed.
  • the adhesive layer of the laminate can be deformed following the cutting blade.
  • the pressure-sensitive adhesive layer swells on the pressure-sensitive adhesive surface side of the resulting pressure-sensitive adhesive film, and there is a possibility that a bulge is formed at the periphery of the through hole.
  • bubbles can be generated around the through holes.
  • the pressure-sensitive adhesive layer when cut from the separator side, the pressure-sensitive adhesive layer can be deformed following the cutting blade, but the peripheral edge on the pressure-sensitive adhesive side of the through-hole of the pressure-sensitive adhesive film is smooth (for example, an arc surface) Even if they are attached to the body, the generation of bubbles can be prevented.
  • the perforated debris can be removed well when the pad is peeled from the laminate after cutting. For example, it is possible to prevent a problem that only a part of the perforated residue (typically, a separator part) is removed.
  • FIG. 1A is a schematic plan view illustrating an example of an arrangement pattern of through holes in an adhesive film obtained by the manufacturing method according to an embodiment of the present invention
  • FIG. 1B illustrates another example of an arrangement pattern of through holes
  • FIG. 1C is a schematic plan view illustrating still another example of the arrangement pattern of the through holes.
  • the through holes 30 can be arranged at substantially equal intervals in both the longitudinal direction and the width direction of the obtained adhesive film 100. Note that “substantially equidistant in both the longitudinal direction and the width direction” means that the spacing in the longitudinal direction is equal and the spacing in the width direction is equal.
  • the interval in the scale direction and the interval in the width direction need not be equal.
  • L1 L2 may be satisfied, or L1 ⁇ L2.
  • the through holes may be arranged at substantially equal intervals in the longitudinal direction and at different intervals in the width direction; they are arranged at different intervals in the longitudinal direction and substantially in the width direction. May be arranged at equal intervals (none of which are shown).
  • 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 all different, or only a part (the interval between specific adjacent through holes) may be different.
  • region may be prescribed
  • the through hole 30 has a straight line connecting through holes adjacent in the longitudinal direction substantially parallel to the longitudinal direction, and has a width.
  • a straight line connecting adjacent through holes in the direction may be arranged to be substantially parallel to the width direction.
  • the through hole 30 has a straight line connecting adjacent through holes in the longitudinal direction substantially parallel to the longitudinal direction, and in the width direction. a straight line connecting the adjacent through-holes are arranged so as to have a predetermined angle theta W in the width direction.
  • FIG. 1A the through hole 30 has a straight line connecting through holes adjacent in the longitudinal direction substantially parallel to the longitudinal direction, and has a width.
  • a straight line connecting adjacent through holes in the direction may be arranged to be substantially parallel to the width direction.
  • the through hole 30 has a straight line connecting adjacent through holes in the longitudinal direction substantially parallel to the longitudinal direction, and in the width direction. a straight line connecting the adjacent through-holes are arranged so as to have a predetermined angle theta W in the width direction.
  • a straight line connecting adjacent through holes in the longitudinal direction has a predetermined angle ⁇ L with respect to the longitudinal direction
  • a straight line connecting adjacent through holes in the width direction is arranged to have a predetermined angle ⁇ W with respect to the width direction.
  • ⁇ L and / or ⁇ W is preferably more than 0 ° and not more than ⁇ 10 °.
  • “ ⁇ ” means to include both clockwise and counterclockwise directions with respect to the reference direction (long direction or width direction).
  • the non-polarizing part can be formed with a desired pattern (pattern corresponding to the arrangement pattern of the through holes) while roll-feeding the long polarizer. .
  • a desired pattern pattern corresponding to the arrangement pattern of the through holes
  • the positional relationship between the part and the absorption axis can be controlled uniformly over the entire long polarizer, and a final product with excellent axial accuracy (and therefore excellent optical characteristics) can be obtained. Therefore, the direction of the absorption axis of the cut polarizer (for example, cutting in the longitudinal direction and / or the width direction, punching) can be precisely controlled to a desired angle, and for each polarizer. Variation in the direction of the absorption axis can be remarkably suppressed. It goes without saying that the arrangement pattern of the through holes is not limited to the illustrated example.
  • a straight line connecting adjacent through holes in the longitudinal direction has a predetermined angle ⁇ L with respect to the longitudinal direction, and a straight line connecting adjacent through holes in the width direction is It may be arranged to be substantially parallel to the direction. Further, a plurality of regions may be defined in the longitudinal direction of the adhesive film 100, and ⁇ L and / or ⁇ W may be set for each region.
  • the through holes can be formed in a desired arrangement pattern.
  • the through holes can be formed in a pattern corresponding to the arrangement pattern of the cutting blades by arranging the plurality of cutting blades in a predetermined pattern.
  • punching is performed while moving the cutting blade attached to the plotter in the XY direction (two-dimensional direction).
  • a desired arrangement pattern can be obtained.
  • a through hole can be formed.
  • the through holes are formed by laser ablation, the through holes can be formed in a desired arrangement pattern by controlling the movement mode of the laser light source as in the case of the XY plotter.
  • through holes are formed in a pattern corresponding to the arrangement pattern of the openings by bringing a mask having openings with a predetermined pattern into contact with the treatment liquid in a state of being laminated on both sides of the adhesive film. can do.
  • Arbitrary appropriate shape may be employ
  • Specific examples include a circle, an ellipse, a square, a rectangle, and a rhombus.
  • a through hole having a desired planar view shape can be formed.
  • a device such as a punching device or an XY plotter
  • a through hole having a shape in plan view corresponding to the shape of the cutting blade can be formed.
  • a through-hole having a desired planar view shape can be formed by adjusting a laser scanning mode.
  • chemical dissolution is used, a through hole having a shape in plan view corresponding to the shape of the opening of the mask can be formed.
  • the adhesive film obtained by the production method according to the embodiment of the present invention is, for example, surface protection when a predetermined portion of a film (typically, a long film) is selectively processed. It can be suitably used as a film or a mask. Specific examples of the selective treatment include decolorization, coloring, perforation, development, etching, patterning (for example, formation of an active energy ray-curable resin layer), chemical modification, and heat treatment.
  • a film typically, a long film
  • the selective treatment include decolorization, coloring, perforation, development, etching, patterning (for example, formation of an active energy ray-curable resin layer), chemical modification, and heat treatment.
  • the pressure-sensitive adhesive film can be used for manufacturing a polarizer having a non-polarizing part (typically, a long polarizer).
  • a polarizer having a non-polarizing part typically, a long polarizer.
  • the polarizer is typically composed of a resin film.
  • the resin film is typically a polyvinyl alcohol-based resin (hereinafter referred to as “PVA-based resin”) film containing a dichroic substance.
  • PVA-based resin polyvinyl alcohol-based resin
  • a single film may be sufficient as a polarizer and the resin layer (typically PVA-type resin layer) formed on the resin base material may be sufficient as it.
  • 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 resin film forming material to the resin base material, a method of laminating the resin film on the resin base material, or the like.
  • dichroic substance examples include iodine and organic dyes. These may be used alone or in combination of two or more. Preferably, iodine is used.
  • iodine is used.
  • any appropriate resin can be used as the PVA resin.
  • Examples thereof include polyvinyl alcohol and ethylene-vinyl alcohol copolymer.
  • Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
  • the ethylene-vinyl alcohol copolymer can be obtained by saponifying an ethylene-vinyl acetate copolymer.
  • the degree of saponification of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, more preferably 99.0 mol% to 99.93 mol%. .
  • the degree of saponification can be determined according to JIS K 6726-1994. By using a PVA-based resin having such a saponification degree, a polarizer having excellent durability can be obtained. If the degree of saponification is too high, there is a risk of gelation.
  • the average degree of polymerization of the PVA resin can be appropriately selected according to the purpose.
  • the average degree of polymerization is usually 1000 to 10,000, preferably 1200 to 4500, and more preferably 1500 to 4300.
  • the average degree of polymerization can be determined according to JIS K 6726-1994.
  • the polarizer preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm.
  • the single transmittance (Ts) of the polarizer (excluding the non-polarized part) is preferably 39% or more, more preferably 39.5% or more, still more preferably 40% or more, and particularly preferably 40.5% or more. .
  • the theoretical upper limit of the single transmittance is 50%, and the practical upper limit is 46%.
  • the single transmittance (Ts) is a Y value measured by a JIS Z8701 two-degree field of view (C light source) and corrected for visibility, for example, using a microspectroscopic system (Lambda Vision, LVmicro). Can be measured.
  • the polarization degree of the polarizer is preferably 99.9% or more, more preferably 99.93% or more, and further preferably 99.95% or more.
  • the thickness of the polarizer can be set to any appropriate value.
  • the thickness is preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, still more preferably 20 ⁇ m or less, and particularly preferably less than 10 ⁇ m.
  • the thickness is preferably 0.5 ⁇ m or more, more preferably 1 ⁇ m or more.
  • a non-polarizing part can be formed favorably, so that thickness is thin. For example, when forming a non-polarization part by decoloring by a chemical process, the contact time of a process liquid and a resin film (polarizer) can be shortened.
  • the absorption axis of the polarizer can be set in any appropriate direction depending on the purpose.
  • the direction of the absorption axis may be, for example, the long direction or the width direction.
  • a polarizer having an absorption axis in the longitudinal direction has an advantage of excellent manufacturing efficiency.
  • a polarizer having an absorption axis in the width direction has an advantage that it can be laminated with, for example, a so-called roll-to-roll with a retardation film having a slow axis in the longitudinal direction.
  • the polarizer can be produced by any appropriate method.
  • the polarizer can be produced by a method well known and commonly used in the art.
  • the polarizer is a PVA-based resin layer formed on a resin substrate, the polarizer can be produced by, for example, a method described in JP2012-73580A. This publication is incorporated herein by reference in its entirety.
  • the polarizer is used to form a non-polarizing portion described later in any appropriate form.
  • the polarizer used for forming the non-polarizing part may be a single PVA resin film, a laminate of a resin base material / PVA resin layer, or a PVA system.
  • the laminated body namely, polarizing plate
  • the polarizing plate used for forming the non-polarizing portion may have an adhesive layer so that it can be attached to the image display device.
  • the polarizing plate may further have any appropriate optical functional layer depending on the purpose.
  • optical functional layer examples include a retardation film (optical compensation film) and a surface treatment layer.
  • a retardation film optical compensation film
  • surface treatment layer a non-polarizing part is formed in the polarizer of the polarizing plate which has the structure of a polarizer / protective layer.
  • the adhesive film 100 is bonded to the surface of the polarizing plate 200 on the polarizer side by roll-to-roll.
  • the pressure-sensitive adhesive film 100 is a pressure-sensitive adhesive film obtained by the production method of the present invention described in the above items A to C.
  • roll-to-roll refers to laminating the rolls in the same long direction while conveying a roll-shaped film.
  • the adhesive film is typically attached to a polarizer so as to be peelable.
  • the pressure-sensitive adhesive film obtained by the production method of the present invention By using the pressure-sensitive adhesive film obtained by the production method of the present invention, it becomes possible to form a non-polarizing part by decoloring treatment by immersing in a decoloring liquid, so that a polarizer having a non-polarizing part is obtained with very high production efficiency. be able to.
  • this adhesive film can function as the surface protective film of the polarizing plate in a decoloring process, the said adhesive film may be called a 1st surface protective film for convenience.
  • the surface protective film is a film that temporarily protects the polarizing plate during work and is peeled off at any appropriate time, and is different from a polarizer protective film simply called a protective film.
  • the adhesive film When laminating a polarizer and an adhesive film by roll-to-roll, the adhesive film is unwound from an adhesive film roll wound in a roll shape, and may be laminated on the polarizer. After forming a through-hole in the said laminated body and obtaining an adhesive film, you may laminate
  • a surface protective film (second surface protective film) is bonded to the surface of the polarizing plate on the protective film side by roll-to-roll (not shown).
  • the second surface protective film is detachably bonded to the polarizer protective film via any appropriate pressure-sensitive adhesive.
  • the polarizing plate polarizer / protective film
  • the second surface protective film a film similar to the pressure-sensitive adhesive film (first surface protective film) obtained in the present invention can be used except that no through hole is provided.
  • a soft (eg, low elastic modulus) film such as a polyolefin (eg, polyethylene) film can be used.
  • the second surface protective film may be bonded simultaneously with the first surface protective film, may be bonded before the first surface protective film is bonded, or after the first surface protective film is bonded. You may stick together.
  • the second surface protective film is bonded before the first surface protective film is bonded.
  • Such a procedure has the advantage that the protective film is prevented from being damaged and that the through-hole of the adhesive film is prevented from being transferred as a mark to the protective film during winding.
  • the aspect which bonds a 2nd surface protection film before bonding a 1st surface protection film may be applied suitably, for example, when a polarizer is a PVA-type resin layer formed on the resin base material.
  • a laminate of the polarizer protective film and the second surface protective film is prepared, and after the laminate is bonded to the laminate of the resin substrate / polarizer, the resin substrate is peeled off, A 1st surface protection film can be bonded together to a peeling surface.
  • the laminate of the first surface protective film / polarizer / protective film / second surface protective film is subjected to a chemical decoloration treatment.
  • the chemical decoloring treatment typically includes contacting the laminate with a decoloring solution (eg, a basic solution).
  • the chemical decolorization treatment may further include removing the basic solution, contacting the laminate with an acidic solution, and removing the acidic solution, as necessary. This will be specifically described below.
  • the contact between the laminate and the basic solution can be performed by any appropriate means. Typical examples include soaking the laminate in a basic solution, or applying or spraying the basic solution onto the laminate. Immersion is preferred. This is because, as shown in FIG. 3, the decolorization process can be performed while the laminate is being conveyed, so that the production efficiency is remarkably high. As described above, immersion can be performed by using the first surface protective film (and the second surface protective film as necessary). Specifically, by immersing in the basic solution, only the portion of the polarizer corresponding to the through hole of the first surface protective film comes into contact with the basic solution.
  • the concentration of iodine at the contact portion of the polarizer with the basic solution is reduced by bringing the polarizer into contact with the basic solution.
  • the non-polarizing part can be selectively formed only in the part (which can be set by the through hole).
  • a non-polarizing part can be selectively formed in a predetermined part of a polarizer with very high manufacturing efficiency without complicated operation.
  • iodine itself is removed from the polarizer (substantially the non-polarizing part) by removing the basic solution described later. As a result, it is possible to prevent a change in the characteristics of the non-polarizing part accompanying the use of the polarizer.
  • the formation of the non-polarizing part by the basic solution will be described in more detail.
  • the basic solution penetrates into the predetermined portion.
  • the iodine complex contained in the predetermined portion is reduced by the base contained in the basic solution to become iodine ions.
  • the polarization performance of the part is substantially lost, and a non-polarizing part is formed in the part.
  • permeability of the said part improves by reduction
  • a non-polarizing portion is selectively formed in a predetermined portion of the polarizer, and the non-polarizing portion is stable without change over time.
  • any appropriate basic compound can be used as the basic compound contained in the basic solution.
  • Examples of basic compounds 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, acetic acid Organic alkali metal salts such as sodium, aqueous ammonia and the like can be mentioned.
  • the basic compound contained in the basic solution is preferably an alkali metal hydroxide, more preferably sodium hydroxide, potassium hydroxide, or lithium hydroxide.
  • any appropriate solvent can be used as the solvent of the basic solution.
  • Specific examples include water, alcohols such as ethanol and methanol, ethers, benzene, chloroform, and mixed solvents thereof. Since iodine ions migrate to the solvent satisfactorily and iodine ions can be easily removed in the subsequent removal of the basic solution, the solvent is preferably water or alcohol.
  • the concentration of the basic solution is, for example, 0.01N to 5N, preferably 0.05N to 3N, and more preferably 0.1N to 2.5N.
  • concentration of the basic solution is in such a range, the iodine concentration inside the polarizer 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 basic solution is, for example, 20 ° C. to 50 ° C.
  • the contact time between the laminate (substantially a predetermined portion of the polarizer) and the basic solution is determined by the thickness of the polarizer, the type of basic compound contained in the basic solution used, and the concentration of the basic compound. For example, 5 to 30 minutes.
  • the basic solution can be removed by any appropriate means as necessary after contact with a predetermined portion of the polarizer.
  • Specific examples of the method for removing the basic solution include washing, wiping removal with a waste cloth, suction removal, natural drying, heat drying, air drying, vacuum drying, and the like. Cleaning is preferred. This is because the basic solution removal performance is excellent, a complicated apparatus is not required, and the production efficiency is excellent.
  • Examples of the liquid used for washing include water (pure water), alcohols such as methanol and ethanol, acidic aqueous solutions, and mixed solvents thereof. Preferably, it is water.
  • the cleaning is typically performed while transporting the laminate as shown in FIG. Washing may be performed multiple times.
  • the drying temperature when the basic solution is removed by drying is, for example, 20 ° C. to 100 ° C.
  • the laminate (substantially a predetermined part of the polarizer) in contact with the basic solution can be further brought into contact with the acidic solution.
  • the contact between the laminate and the acidic solution can be performed by any appropriate means. As in the case of contact with a basic solution, immersion is preferred. By contacting with an acidic solution, the basic solution remaining in the non-polarizing part can be removed to a better level. Moreover, the dimensional stability and durability of a non-polarizing part can improve by making it contact with an acidic solution.
  • the contact with the acidic solution may be performed after removing the basic solution or may be performed without removing the basic solution.
  • any appropriate acidic compound can be used as the acidic compound contained in the acidic solution.
  • 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, more preferably hydrochloric acid, sulfuric acid, or nitric acid. These acidic compounds may be used alone or in combination.
  • the solvent for the acidic solution those exemplified as the solvent for 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 ° C. to 50 ° C.
  • the contact time between the laminate (substantially a predetermined part of the polarizer) and the acidic solution is determined by determining the thickness of the resin film (polarizer), the type of acidic compound contained in the acidic solution used, and the concentration of the acidic compound. For example, 5 to 30 minutes. As needed, after making a laminated body and an acidic solution contact, you may remove by wiping etc. immediately.
  • the acidic solution can be removed by any appropriate means as necessary after contact with a predetermined portion of the polarizer. As with the removal of the basic solution, washing is preferred.
  • the liquid used for washing include water (pure water), alcohols such as methanol and ethanol, acidic aqueous solutions, and mixed solvents thereof. Preferably, it is water.
  • the cleaning is typically performed while transporting the laminate as shown in FIG. Washing may be performed multiple times.
  • the laminate after removal of the acidic solution is subjected to washing liquid removal and drying as necessary (not shown).
  • the removal of the cleaning liquid typically water
  • the removal of the cleaning liquid can be performed by any suitable means. Specific examples include blowing with a blower, passing the laminate through a sponge roll, and combinations thereof.
  • blowing can be performed, for example, by transporting the laminate in an oven.
  • the drying temperature is, for example, 20 ° C. to 100 ° C.
  • the drying time is, for example, 5 seconds to 600 seconds.
  • the adhesive film (first surface protective film) and the second surface protective film can be peeled and removed.
  • a non-polarizing portion can be formed with a predetermined arrangement pattern at a predetermined position of the elongated polarizer.
  • a polarizer having a non-polarizing part can be used, for example, in an image display device having a camera part.
  • the non-polarizing portion is typically disposed at a position corresponding to the camera portion of the image display device when the polarizer is cut to a predetermined size in order to attach the polarizer to the image display device of a predetermined size. Therefore, when only one size polarizer is cut from one long polarizer, the non-polarizing portion is substantially equal in both the long direction and the width direction as shown in FIG. 1A. Can be arranged at intervals. With such a configuration, it is easy to control the cutting of the polarizer to a predetermined size in accordance with the size of the image display device, and the yield can be improved.
  • the position of the non-polarizing part can be set accurately, the position of the non-polarizing part in the obtained polarizer of a predetermined size can be controlled well. As a result, since the variation in the position of the non-polarizing portion for each obtained polarizer of a predetermined size is reduced, it is possible to obtain a polarizer of a predetermined size with no quality variation.
  • the interval between the non-polarizing portions in the long direction and / or the width direction may be changed according to the size of the polarizer to be cut. it can.
  • the non-polarizing part can be formed with a desired arrangement pattern by appropriately setting the arrangement pattern of the through holes in the adhesive film.
  • the transmittance of the non-polarizing part (for example, the transmittance measured with light having a wavelength of 550 nm at 23 ° C.) is preferably 50% or more, more preferably 60% or more, further preferably 75% or more, Particularly preferably, it is 90% or more. With such transmittance, desired transparency as a non-polarizing portion can be ensured. As a result, when the polarizer is arranged so that the non-polarizing part corresponds to the camera part of the image display device, it is possible to prevent an adverse effect on the photographing performance of the camera.
  • the content of the dichroic substance in the non-polarizing part 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 non-polarizing part is in such a range, the above transmittance can be sufficiently satisfied.
  • any appropriate shape can be adopted as the planar view shape of the non-polarizing part as long as it does not adversely affect the camera performance of the image display device using the polarizer.
  • a non-polarizing portion having a desired planar view shape can be formed.
  • Example 1 A long laminate (width: 1200 mm, length: 43 m) having a configuration of ester film (thickness 38 ⁇ m) / adhesive layer (thickness 5 ⁇ m) / separator (thickness 25 ⁇ m) was prepared.
  • a carrier film (width: 1200 mm, length: 43 m) having a structure of ester film (thickness 38 ⁇ m) / adhesive layer (thickness 5 ⁇ m) is bonded to the surface of the ester film of this laminate by roll-to-roll, and the carrier A laminate with a film was produced.
  • a cutting blade having a depth of 80 ⁇ m from the separator surface was inserted into the laminate with a carrier film using a punching device, and half cut into a circle having a diameter of 2.4 mm so as not to penetrate the carrier film.
  • Half-cutting was performed every 250 mm in the longitudinal direction and every 400 mm in the width direction.
  • the carrier film was peeled from the laminate to obtain an adhesive film.
  • Example 2 Adhesion in the same manner as in Example 1 except that a laser cutting machine (CO 2 laser, wavelength: 9.4 ⁇ m, output: 10 W) was used instead of the punching device, and half cut (cutting depth: 80 ⁇ m) was used. A film was obtained.
  • a laser cutting machine CO 2 laser, wavelength: 9.4 ⁇ m, output: 10 W
  • half cut cutting depth: 80 ⁇ m
  • IPA copolymerized PET amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 ⁇ m) having a long water absorption rate of 0.75% and Tg of 75 ° C. was used.
  • One side of the substrate was subjected to corona treatment, and polyvinyl alcohol (degree of polymerization 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (degree of polymerization 1200, degree of acetoacetyl modification 4.6) were applied to this corona-treated surface.
  • a PVA resin layer was formed to prepare a laminate.
  • the obtained laminate was uniaxially stretched in the longitudinal direction (longitudinal direction) 2.0 times between rolls having different peripheral speeds in an oven at 120 ° C. (air-assisted stretching).
  • the laminate was immersed in an insolubilization bath (a boric acid aqueous solution obtained by blending 4 parts by weight of boric acid with respect to 100 parts by weight of water) for 30 seconds (insolubilization treatment).
  • boric acid aqueous solution obtained by blending 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water.
  • Crosslinking treatment Thereafter, the laminate was immersed in a boric acid aqueous solution (an aqueous solution obtained by blending 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 70 ° C.
  • uniaxial stretching was performed between the rolls having different peripheral speeds in the longitudinal direction (longitudinal direction) so that the total stretching ratio was 5.5 times (in-water stretching).
  • the laminate was immersed in a cleaning bath (an aqueous solution obtained by blending 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C. (cleaning treatment).
  • a PVA resin aqueous solution manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name “GOHSEPIMAR (registered trademark) Z-200”, resin concentration: 3% by weight
  • a protective film thickness 25 ⁇ m
  • the base material was peeled from the PVA resin layer to obtain a polarizing plate (width: 1200 mm, length: 43 m) having a transmittance of 42.3% and a thickness of 5 ⁇ m.
  • the pressure-sensitive adhesive film obtained in each example was peeled off and bonded with a roll-to-roll to obtain a polarizing film laminate.
  • a sodium hydroxide aqueous solution (1.0 mol / L (1.0 N)) at room temperature was dropped onto a portion where the polarizer was exposed from the adhesive film of the obtained polarizing film laminate, and left for 60 seconds. Thereafter, the dropped sodium hydroxide aqueous solution was removed with a waste cloth, and then the adhesive film was peeled off to obtain a polarizing plate (polarizer) on which a transparent portion was formed.
  • Ts Transmittance
  • the measurement was performed using a spectrophotometer (product name “DOT-3” manufactured by Murakami Color Research Laboratory Co., Ltd.).
  • the transmittance (T) is a Y value obtained by correcting the visibility with a 2-degree field of view (C light source) of JlS Z 8701-1982.
  • Iodine content The iodine content in the transparent part of the polarizer was determined by fluorescent X-ray analysis. Specifically, the iodine content of the polarizer was determined from an X-ray intensity measured under the following conditions, using a calibration curve prepared in advance using a standard sample.
  • ⁇ Analyzer X-ray fluorescence analyzer (XRF) manufactured by Rigaku Corporation, product name “ZSX100e” ⁇ Anti-cathode: Rhodium ⁇ Spectral crystal: Lithium fluoride ⁇ Excitation light energy: 40 kV-90 mA ⁇ Iodine measurement line: I-LA Quantitative method: FP method 2 ⁇ angle peak: 103.078 deg (iodine) ⁇ Measurement time: 40 seconds
  • a transparent part having a transmittance of 93% to 94% and an iodine content of 0.15% by weight or less is formed, and these can function as a non-polarizing part.
  • the non-polarizing part was a circle with a diameter of 2.4 mm corresponding to the shape of the through hole of the adhesive film.
  • the pressure-sensitive adhesive film obtained 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 long film) is selectively processed.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
  • Manufacturing & Machinery (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Adhesive Tapes (AREA)
  • Electroluminescent Light Sources (AREA)
PCT/JP2015/068500 2014-06-27 2015-06-26 長尺状の粘着フィルムの製造方法 WO2015199213A1 (ja)

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JP6802329B2 (ja) * 2018-12-13 2020-12-16 住友化学株式会社 打抜き用具、及び、偏光板の打抜き方法
KR102802342B1 (ko) * 2018-12-13 2025-04-29 스미또모 가가꾸 가부시키가이샤 펀칭 용구 및 편광판의 펀칭 방법
JP6655205B1 (ja) * 2018-12-13 2020-02-26 住友化学株式会社 打抜き用具、及び、打抜き方法
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