WO2017170537A1 - 光学フィルム、剥離方法及び光学表示パネルの製造方法 - Google Patents
光学フィルム、剥離方法及び光学表示パネルの製造方法 Download PDFInfo
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- WO2017170537A1 WO2017170537A1 PCT/JP2017/012618 JP2017012618W WO2017170537A1 WO 2017170537 A1 WO2017170537 A1 WO 2017170537A1 JP 2017012618 W JP2017012618 W JP 2017012618W WO 2017170537 A1 WO2017170537 A1 WO 2017170537A1
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- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/748—Releasability
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
Definitions
- the present invention relates to a sheet-like optical film in which a release film, a first pressure-sensitive adhesive layer, a polarizing film, and a surface protective film are laminated in this order. Moreover, this invention relates to the peeling method of the release film which concerns on the said optical film. Furthermore, this invention relates to the manufacturing method of the optical display panel using the said optical film.
- a polarizing film is used as a polarizing film with a pressure-sensitive adhesive layer provided with a pressure-sensitive adhesive layer on one side to be attached to an optical cell such as a liquid crystal cell.
- a release film is temporarily attached to the pressure-sensitive adhesive layer until it is applied for bonding.
- a surface protective film is temporarily attached to the other surface of the polarizing film.
- Such a polarizing film with a pressure-sensitive adhesive layer having a release film and a surface protective film is applied to an optical display panel.
- the release film is peeled from the polarizing film with a pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive layer exposed is bonded to the optical cell.
- the surface protective film is directly bonded to the bonded polarizing film with the pressure-sensitive adhesive layer.
- the bonding is, for example, a method in which the pressure-sensitive adhesive layer-attached polarizing film is fed out from a wound body and bonded to the surface of the optical cell via the pressure-sensitive adhesive layer exposed by peeling off the release film (hereinafter referred to as the adhesive layer). Also referred to as “roll-to-panel method.” Patent Document 1). Also, a method of attaching a polarizing film with a pressure-sensitive adhesive layer in a single-wafer state to an optical cell through an adhesive layer exposed by peeling off a release film (hereinafter also referred to as “sheet-to-panel method”). )
- thinning of a polarizing film can be performed by providing a protective film only on one side of the polarizer and using a single protective polarizing film that is not provided with a protective film on the other side.
- the single-protective polarizing film can be a thin type because the protective film is less than one protective polarizing film provided with protective films on both sides of the polarizer.
- the release film When releasing the release film from the polarizing film with the pressure-sensitive adhesive layer having the release film and the surface protective film, the release film is usually in a state where the surface protective film side of the polarizing film with the pressure-sensitive adhesive layer is fixed. Is peeled off.
- the surface protective film can be easily peeled without any adhesive residue, and the peel strength of the surface protective film has been further reduced.
- the release film that is peeled first is designed so that the peeling force is sufficiently small (easy to peel) compared to the surface protective film that is peeled later. It is desirable.
- the polarizing film with the pressure-sensitive adhesive layer is designed so that the peel strength of the surface protective film is not sufficiently large or the peel strength of the surface protective film is smaller than the peel strength of the release film. It was newly discovered that it was proposed. Therefore, at the time of peeling of a release film, the problem which peeling will arise in the interface of a polarizing film and a surface protective film instead of the interface of a release film and an adhesive layer has arisen.
- the problem can be solved, for example, by making the peeling force of the surface protective film and the peeling force of the release film substantially the same.
- the release film is required to have a peeling force that exceeds a predetermined level in order to ensure the adhesion between the polarizing film and the optical cell.
- the release film is designed to have the same release force as that of the surface protective film.
- the adhesion between the polarizing film and the optical cell is reduced, or the demand for reducing the peeling force of the surface protective film cannot be met.
- the above problem is apparent when a release film is peeled from a sheet-like polarizing film with a pressure-sensitive adhesive layer having a thin polarizing film of a predetermined thickness or less (for example, a thickness of 60 ⁇ m or less) in a sheet-to-panel system.
- the present invention is a sheet-like optical film in which a release film, a first pressure-sensitive adhesive layer, a polarizing film and a surface protective film are laminated in this order, and even when a thin polarizing film is used, It aims at providing the optical film which can peel a type
- the present invention also aims to provide a release film peeling method for the optical film, and further to provide a method for manufacturing an optical display panel using the optical film.
- the present invention is a sheet-like optical film in which a release film, a first pressure-sensitive adhesive layer, a polarizing film, and a surface protective film are laminated in this order,
- the polarizing film has a thickness of 60 ⁇ m or less, and
- the distance x ( ⁇ m) between the virtual center plane f and the surface protective film and the distance y ( ⁇ m) between the virtual center plane f and the release film have a relationship of xy> ⁇ 20.
- an optical film is a sheet-like optical film in which a release film, a first pressure-sensitive adhesive layer, a polarizing film, and a surface protective film are laminated in this order.
- the polarizing film has a thickness of 60 ⁇ m or less, and
- the distance x ( ⁇ m) between the virtual center plane f and the surface protective film and the distance y ( ⁇ m) between the virtual center plane f and the release film have a relationship of xy> ⁇ 20.
- an optical film is
- the distance x ( ⁇ m) and the distance y are preferably in a relationship of xy> ⁇ 10.
- the present invention is suitable when the peel force (1) of the release film is greater than the peel force (2) of the surface protective film.
- the virtual center plane f is preferably in the first pressure-sensitive adhesive layer or the polarizing film.
- a thickness of the release film is larger than a thickness of the surface protective film.
- the optical film has a base film and a second pressure-sensitive adhesive layer as the surface protective film, and can be laminated on the polarizing film via the second pressure-sensitive adhesive layer. Moreover, a self-adhesive film can be used as the surface protective film.
- the optical film is suitably applied when the polarizing film has a polarizer having a thickness of 10 ⁇ m or less. Moreover, the said optical film is applied suitably when the said polarizing film is a piece protection polarizing film which has a protection film only in the single side
- the present invention also relates to a release film peeling method characterized by peeling the release film from the optical film.
- this invention is a process (1) which prepares the said optical film, A step (2) of peeling the release film from the optical film, and It is related with the manufacturing method of the optical display panel which has the process (3) of bonding the 1st adhesive layer side of the said optical film from which the said release film was peeled off to the one surface of an optical cell.
- a liquid crystal cell or an organic EL cell can be used as the optical cell.
- the optical film of the present invention (polarizing film with a pressure-sensitive adhesive layer having a release film and a surface protective film) has a distance x between the virtual center plane f and the surface protective film, and the virtual center plane f and the mold release.
- the distance y from the film is designed so that xy> -20.
- the polarizing film can be easily peeled from the sheet-like optical film without causing peeling at the interface between the surface protective film and the surface protective film.
- FIG. 3 is a partially enlarged view of a schematic cross-sectional view of the optical film of FIG. 1 or FIG. 2.
- FIG. 1 to 3 are schematic cross-sectional views of the optical film F.
- the optical film F has a configuration in which a release film 3, a first pressure-sensitive adhesive layer 2, a polarizing film 1, and a surface protective film 4 are laminated in this order.
- FIG. 2 shows a case where the polarizing film 1 is a piece protective polarizing film 1 ′ having a protective film 1b only on one side of the polarizer 1a.
- the piece protective polarizing film 1 ′ is illustrated as having a first pressure-sensitive adhesive layer on the polarizer 1 a side, but the piece protective polarizing film 1 ′ is first on the protective film 1 b side. It can also arrange
- both the protective polarizing films which have the protective film 1b on both sides of the polarizer 1a can be used.
- FIG. 2 shows a case where the surface protective film 4 has a base film 41 and a second pressure-sensitive adhesive layer 42.
- the second pressure-sensitive adhesive layer 42 side of the surface protective film 4 is bonded to the polarizing film 1.
- 1 and 3 show a case where the surface protective film 4 is a self-adhesive film.
- the virtual center plane f in the plane direction at the intermediate position in the total thickness of the optical film F is indicated by a one-dot chain line.
- the virtual center plane f is described within the thickness of the polarizing film 1, but the virtual center plane f may be within the thickness of the first pressure-sensitive adhesive layer 2. It may be within the thickness of the mold film 3.
- FIG. 3 is a partially enlarged view of FIG. 1 or FIG. FIG. 3 shows a distance x ( ⁇ m) between the virtual center plane f and the surface protective film 4 and a distance y ( ⁇ m) between the virtual center plane f and the release film 3.
- the virtual center plane f is described within the thickness of the polarizing film 1, but the virtual center plane f may be within the thickness of the first pressure-sensitive adhesive layer 2 as described above. Moreover, it may be within the thickness of the release film 3.
- the thickness of each member is designed so that x and y have a relationship of xy> ⁇ 20.
- x and y have a relationship of xy> ⁇ 10.
- the thickness of the release film 3 increases the value of x and is relatively larger than the value of y, which is preferable for satisfying the relationship.
- the thickness of the release film 3 tends to increase, which is not preferable in terms of cost and handling.
- the virtual center plane f is designed to be within the thickness of the polarizing film 1 or the first pressure-sensitive adhesive layer 2, and the relationship of x and y satisfies xy> -20. By designing so, the ease of release of the release film can be secured while suppressing the thickness of the release film 3.
- the value of xy serves as an index indicating the positional relationship of the virtual center plane f in the optical film F.
- the distance x The value is calculated as a “ ⁇ ” number in the xy listing.
- the value of the distance y is calculated as a numerical value of “ ⁇ ” in the xy publication.
- the peel force (1) is the peel force of the release film 3 with respect to the first pressure-sensitive adhesive layer 2
- the peel force (2) is the peel force of the surface protective film 4 with respect to the polarizing film 1.
- the peeling force (1) is preferably 0.03 N / 25 mm or more from the viewpoint of preventing end lifting during processing. Furthermore, it is preferably 0.05 to 0.5 N / 25 mm, more preferably 0.1 to 0.3 N / 25 mm. Further, the peeling force (2) is preferably 0.2 N / 25 mm or less, more preferably 0.01 to 0.1 N / 25 mm, and further preferably 0.01 from the viewpoint of simple peeling. It is preferable to be 0.05 N / 25 mm.
- the optical film F of the present invention is suitably applied in the case of a design in which the release force (1) of the release film 3 is greater than the release force (2) of the surface protective film 4.
- the value ⁇ peeling force (1) / peeling force (2) ⁇ of the peeling force (1) with respect to the peeling force (2) is 1.1 times or more. It is suitable when it is 5 times or more.
- a polarizing film having a thickness (total thickness) of 60 ⁇ m or less is used.
- the thickness of the polarizing film may be 55 ⁇ m or less, further 50 ⁇ m or less from the viewpoint of thinning.
- the peeling film is likely to be peeled off at the interface between the polarizing film and the surface protective film instead of the interface between the release film and the pressure-sensitive adhesive layer.
- Application to the polarizing film is more preferable.
- the configuration of the polarizing film for example, (1) a configuration in which protective films are laminated in this order on both sides of the polarizer (both protective polarizing films), and (2) a protective film is laminated only on one side of the polarizer. Structure (single protective polarizing film).
- polarizer using a polyvinyl alcohol-based resin is used.
- polarizers include dichroic iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
- hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
- polyene-based oriented films such as those obtained by adsorbing substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
- a polarizer composed of a polyvinyl alcohol film and a dichroic material such as iodine is preferable.
- a polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it can be produced, for example, by dyeing polyvinyl alcohol in an aqueous iodine solution and stretching it 3 to 7 times the original length. If necessary, it may contain boric acid, zinc sulfate, zinc chloride, or the like, or may be immersed in an aqueous solution such as potassium iodide. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
- Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching.
- the film can be stretched even in an aqueous solution such as boric acid or potassium iodide or in a water bath.
- the thickness of the polarizer is preferably 10 ⁇ m or less from the viewpoint of thinning, more preferably 8 ⁇ m or less, further 7 ⁇ m or less, and further preferably 6 ⁇ m or less.
- the thickness of the polarizer is preferably 2 ⁇ m or more, and more preferably 3 ⁇ m or more.
- Such a thin polarizer has less thickness unevenness, excellent visibility, and less dimensional change, and therefore excellent durability against thermal shock.
- a polarizing film including a polarizer having a thickness of 10 ⁇ m or less has a significantly low elasticity (elastic modulus)
- the release film and the pressure-sensitive adhesive layer are peeled off when the release film is peeled off in the sheet-to-panel method. Peeling is particularly likely to occur at the interface between the polarizing film and the surface protective film rather than at the interface of the present invention, and the present invention is particularly suitable for the polarizing film.
- the thin polarizer described in the publication 2014/077636 pamphlet etc. or the thin polarizer obtained from the manufacturing method described in these can be mentioned.
- a polarizer configured so as to satisfy the above-described conditions uniquely has performance required as a display for a liquid crystal television using a large display element. Specifically, the contrast ratio is 1000: 1 or more and the maximum luminance is 500 cd / m 2 or more. As other uses, for example, it is bonded to the viewing side of the organic EL cell.
- Patent No. 4751486, Patent in that it can be stretched at a high magnification and the polarization performance can be improved.
- stretching in a boric-acid aqueous solution as described in the 4751481 specification and the patent 4815544 specification is preferable, and it describes especially in the patent 4751481 specification and the patent 4815544 specification.
- stretching in the boric-acid aqueous solution which has this is preferable.
- These thin polarizers can be obtained by a production method including a step of stretching a polyvinyl alcohol-based resin (hereinafter also referred to as PVA-based resin) layer and a stretching resin base material in a laminated state and a step of dyeing.
- PVA-based resin polyvinyl alcohol-based resin
- a stretching resin base material in a laminated state
- dyeing a step of dyeing
- a material excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is preferable.
- polyester polymers such as polyethylene terephthalate and polyethylene naphthalate
- cellulose polymers such as diacetyl cellulose and triacetyl cellulose
- acrylic polymers such as polymethyl methacrylate
- styrene such as polystyrene and acrylonitrile / styrene copolymer (AS resin)
- AS resin acrylonitrile / styrene copolymer
- These protective films are usually bonded to the polarizer by an adhesive layer.
- thermoplastic resin in the protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight.
- content of the said thermoplastic resin in a protective film is 50 weight% or less, there exists a possibility that the high transparency etc. which a thermoplastic resin originally has cannot fully be expressed.
- a retardation film As the protective film, a retardation film, a brightness enhancement film, a diffusion film, and the like can also be used.
- the thickness of the protective film can be determined as appropriate, but in general, it is preferably 5 to 50 ⁇ m, more preferably 5 to 45 ⁇ m from the viewpoints of workability such as strength and handleability, and thin layer properties. Is preferred.
- a functional layer such as a hard coat layer, an antireflection layer, an antisticking layer, a diffusion layer or an antiglare layer can be provided on the surface of the protective film where the polarizer is not adhered.
- the hard coat layer, the antireflection layer, the antisticking layer, the diffusion layer, the antiglare layer, and other functional layers can be provided on the protective film itself, or can be provided separately from the protective film. it can.
- the protective film and the polarizer are laminated via an intervening layer such as an adhesive layer, an adhesive layer, and an undercoat layer (primer layer). At this time, it is desirable that the both are laminated without an air gap by an intervening layer.
- an intervening layer such as an adhesive layer, an adhesive layer, and an undercoat layer (primer layer).
- the intervening layer of the polarizer 1a and the protective film 1b is not shown.
- the adhesive layer is formed with an adhesive.
- the type of the adhesive is not particularly limited, and various types can be used.
- the adhesive layer is not particularly limited as long as it is optically transparent. Examples of the adhesive include water-based, solvent-based, hot-melt-based, active energy ray-curable types, and the like. Or an active energy ray hardening-type adhesive agent is suitable.
- water-based adhesives examples include isocyanate-based adhesives, polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latex systems, and water-based polyesters.
- the water-based adhesive is usually used as an adhesive composed of an aqueous solution, and usually contains 0.5 to 60% by weight of solid content.
- the active energy ray curable adhesive is an adhesive that cures by an active energy ray such as an electron beam and ultraviolet rays (radical curable type and cationic curable type). Can be used.
- an active energy ray such as an electron beam and ultraviolet rays (radical curable type and cationic curable type).
- a photo radical curable adhesive can be used.
- the photo radical curable active energy ray curable adhesive is used as an ultraviolet curable adhesive, the adhesive contains a radical polymerizable compound and a photo polymerization initiator.
- the adhesive coating method is appropriately selected depending on the viscosity of the adhesive and the target thickness.
- coating methods include reverse coaters, gravure coaters (direct, reverse and offset), bar reverse coaters, roll coaters, die coaters, bar coaters, rod coaters and the like.
- a method such as a dapping method can be appropriately used.
- the adhesive is preferably applied so that the finally formed adhesive layer has a thickness of 30 to 300 nm.
- the thickness of the adhesive layer is more preferably 60 to 150 nm.
- the thickness of the adhesive layer is preferably 0.2 to 20 ⁇ m.
- an easily bonding layer can be provided between a protective film and an adhesive bond layer.
- the easy adhesion layer can be formed of, for example, various resins having a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone-based, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, and the like. These polymer resins can be used alone or in combination of two or more. Moreover, you may add another additive for formation of an easily bonding layer. Specifically, a stabilizer such as a tackifier, an ultraviolet absorber, an antioxidant, and a heat resistance stabilizer may be used.
- the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive.
- Various pressure-sensitive adhesives can be used as the pressure-sensitive adhesive, such as rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, polyvinylpyrrolidone-based pressure-sensitive adhesives, Examples include acrylamide-based adhesives and cellulose-based adhesives.
- An adhesive base polymer is selected according to the type of the adhesive.
- acrylic pressure-sensitive adhesives are preferably used because they are excellent in optical transparency, exhibit appropriate wettability, cohesiveness, and adhesive pressure-sensitive adhesive properties, and are excellent in weather resistance and heat resistance.
- the undercoat layer (primer layer) is formed to improve the adhesion between the polarizer and the protective film.
- the material constituting the primer layer is not particularly limited as long as the material exhibits a certain degree of strong adhesion to both the base film and the polyvinyl alcohol-based resin layer.
- a thermoplastic resin excellent in transparency, thermal stability, stretchability, etc. is used.
- the thermoplastic resin include an acrylic resin, a polyolefin resin, a polyester resin, a polyvinyl alcohol resin, or a mixture thereof.
- Adhesives include rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinyl pyrrolidone adhesives, polyacrylamide adhesives, Examples thereof include cellulose-based pressure-sensitive adhesives.
- pressure-sensitive adhesives those having excellent optical transparency, suitable wettability, cohesiveness, and adhesive pressure characteristics, and excellent weather resistance and heat resistance are preferably used.
- An acrylic pressure-sensitive adhesive is preferably used as one exhibiting such characteristics.
- the pressure-sensitive adhesive is applied to a release film (separator or the like) from which the pressure-sensitive adhesive has been peeled off, and after removing the polymerization solvent and the like to form a pressure-sensitive adhesive layer, a polarizing film Or a method of applying the pressure-sensitive adhesive to a polarizing film and drying and removing the polymerization solvent to form a pressure-sensitive adhesive layer on the polarizer.
- a release film separator or the like
- a polarizing film a method of applying the pressure-sensitive adhesive to a polarizing film and drying and removing the polymerization solvent to form a pressure-sensitive adhesive layer on the polarizer.
- one or more solvents other than the polymerization solvent may be added as appropriate.
- a silicone release liner is preferably used as the release film after the release treatment.
- an appropriate method may be adopted as appropriate according to the purpose.
- a method of heating and drying the coating film is used.
- the heating and drying temperature is preferably 40 ° C to 200 ° C, more preferably 50 ° C to 180 ° C, and particularly preferably 70 ° C to 170 ° C. By setting the heating temperature within the above range, an adhesive having excellent adhesive properties can be obtained.
- the drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.
- Various methods are used as a method for forming the pressure-sensitive adhesive layer. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Examples thereof include an extrusion coating method.
- the thickness of the pressure-sensitive adhesive layer is not particularly limited, and is, for example, about 1 to 100 ⁇ m.
- the thickness is preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and still more preferably 5 to 35 ⁇ m.
- the release film protects the first pressure-sensitive adhesive layer until it is practically used.
- the constituent material of the release film include plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof.
- a plastic film is preferably used from the viewpoint of excellent surface smoothness.
- the plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer.
- a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, and a vinyl chloride co-polymer are used.
- examples thereof include a polymer film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.
- release and antifouling treatment with a silicone-based, fluorine-based, long-chain alkyl-based or fatty acid amide-based release agent, silica powder, etc., coating type, kneading type, An antistatic treatment such as a vapor deposition type can also be performed.
- the release property from the first pressure-sensitive adhesive layer can be further improved by appropriately performing a release treatment such as silicone treatment, long-chain alkyl treatment, and fluorine treatment on the surface of the release film.
- the thickness of the release film is usually preferably 5 to 200 ⁇ m, more preferably 5 to 100 ⁇ m, and still more preferably 20 to 90 ⁇ m. As shown in FIG. 3, the thickness of the release film is such that the distance x between the virtual center plane f and the surface protective film and the distance y between the virtual center plane f and the release film are xy> ⁇ It is preferable that the thickness is designed to be larger than the thickness of the surface protective film described later so as to have a relationship of 20.
- the difference between the thickness of the release film and the thickness of the surface protection film is preferably 5 to 70 ⁇ m, and more preferably 7 to 65 ⁇ m. It is preferably 10 to 60 ⁇ m.
- the surface protective film is provided on one side of the polarizing film (the side on which the first pressure-sensitive adhesive layer is not laminated) in the optical film, and protects the polarizing film.
- a film material having isotropic property or close to isotropic property is selected from the viewpoints of inspection property and manageability.
- film materials include polyester resins such as polyethylene terephthalate film, cellulose resins, acetate resins, polyether sulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, acrylic resins, and the like. Examples thereof include transparent polymers such as resins. Of these, polyester resins are preferred.
- the base film can be used as a laminate of one kind or two or more kinds of film materials, and a stretched product of the film can also be used.
- the thickness of the base film is designed so as to satisfy the relationship of xy> ⁇ 20.
- the thickness of the base film is generally 10 to 150 ⁇ m, preferably 20 to 100 ⁇ m.
- the base film can be used as a self-adhesive film, and a film having the base film and the second pressure-sensitive adhesive layer can be used. It is preferable to use a surface protective film having a second pressure-sensitive adhesive layer from the viewpoint of protecting the polarizing film.
- the second pressure-sensitive adhesive layer used for laminating the surface protective film has, for example, a (meth) acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine-based or rubber-based polymer as a base polymer.
- An adhesive can be appropriately selected and used. From the viewpoints of transparency, weather resistance, heat resistance and the like, an acrylic pressure-sensitive adhesive having an acrylic polymer as a base polymer is preferable.
- the thickness (dry film thickness) of the second pressure-sensitive adhesive layer is determined according to the required adhesive force. Usually, it is about 1 to 100 ⁇ m, preferably 5 to 50 ⁇ m.
- a release treatment layer is provided on the surface protective film (on the opposite side of the surface when the second pressure-sensitive adhesive layer is provided) using a low adhesive material such as silicone treatment, long-chain alkyl treatment, or fluorine treatment. Can do.
- the thickness of the surface protective film is the total thickness of the base film, the second pressure-sensitive adhesive layer, and the release treatment layer.
- the optical film is prepared in a single-wafer state having a predetermined shape (step (1)).
- An example of the predetermined shape is a rectangular object.
- the release film is peeled from the optical film (step (2)).
- the surface of the optical film is fixed by, for example, adsorption or the like, and the release film can be peeled off using a peeling roller or the like (for example, Japanese Patent Laid-Open No. Hei 9- 114384).
- the optical film of the present invention can be used by being laminated with other optical layers in practical use.
- the optical layer is not particularly limited, but for example, a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including wavelength plates such as 1/2 and 1/4), a viewing angle compensation film, and a brightness enhancement film
- a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including wavelength plates such as 1/2 and 1/4), a viewing angle compensation film, and a brightness enhancement film
- One layer or two or more optical layers that may be used for forming the above may be used.
- the optical film in which the optical layer is laminated can also be formed by a method of laminating separately in the manufacturing process of a liquid crystal display device or the like. There is an advantage that it is excellent in assembling work and can improve the manufacturing process of a liquid crystal display device or the like.
- an appropriate adhesive means such as a pressure-sensitive adhesive layer can be used.
- their optical axes can be arranged at an appropriate angle depending on the intended retardation characteristics and the like.
- the liquid crystal cell has a structure in which a liquid crystal layer is sealed between a pair of substrates (a first substrate (viewing side surface) Pa and a second substrate (back surface) Pb) disposed to face each other.
- a liquid crystal layer is sealed between a pair of substrates (a first substrate (viewing side surface) Pa and a second substrate (back surface) Pb) disposed to face each other.
- VA vertical alignment
- IPS in-plane switching
- a liquid crystal display panel has a polarizing film bonded to one or both sides of a liquid crystal cell, and a drive circuit is incorporated as necessary.
- Appropriate liquid crystal display devices such as a liquid crystal display device in which an optical film is disposed on one side or both sides of a liquid crystal cell, and a backlight or reflector used in an illumination system can be formed.
- the optical film of this invention can be installed in the one side or both sides of a liquid crystal cell.
- the optical films of the present invention may be the same or different.
- a liquid crystal display device for example, a single layer or a suitable part such as a diffusing plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusing plate, a backlight, etc. Two or more layers can be arranged.
- Organic EL cell as another optical cell has a configuration in which an electroluminescent layer is sandwiched between a pair of electrodes.
- organic EL cell for example, an arbitrary type such as a top emission method, a bottom emission method, a double emission method, or the like can be used.
- the optical film (polarizing film) of the present invention is bonded to the organic EL cell together with the retardation film, and a drive circuit is incorporated as necessary.
- ⁇ Preparation of polarizing film> (Production of polarizer)
- IPA copolymerized PET) film (thickness: 100 ⁇ m) having a water absorption of 0.75% and Tg of 75 ° C. is subjected to corona treatment.
- Alcohol polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
- aqueous solution containing 9: 1 ratio of the trade name “Gosefimer Z200”) was applied and dried at 25 ° C. to form a PVA-based resin layer having a thickness of 11 ⁇ m, thereby preparing 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 process).
- 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 rolls having different peripheral speeds in the longitudinal direction (longitudinal direction) so that the total stretching ratio was 5.5 times (in-water stretching treatment).
- 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 cleaning bath an aqueous solution obtained by blending 4 parts by weight of potassium iodide with respect to 100 parts by weight of water
- cleaning treatment a liquid temperature of 30 ° C.
- Protective film A A (meth) acrylic resin film having a lactone ring structure with a thickness of 40 ⁇ m was subjected to corona treatment on the easy adhesion treated surface.
- Protective film B A (meth) acrylic resin film having a lactone ring structure with a thickness of 20 ⁇ m was subjected to corona treatment on the easy adhesion treated surface.
- An ultraviolet curable adhesive was prepared by mixing 40 parts by weight of N-hydroxyethylacrylamide (HEAA), 60 parts by weight of acryloylmorpholine (ACMO), and 3 parts by weight of a photoinitiator “IRGACURE 819” (manufactured by BASF).
- ⁇ Preparation of single protective polarizing film B> In the production of the piece protective polarizing film A, a piece protective polarizing film B was obtained except that the protective film B was used instead of the protective film A for the polarizer (side from which the amorphous PET base material was peeled). It was.
- the optical properties of the obtained piece-protecting polarizing film B were a single transmittance of 42.8% and a degree of polarization of 99.99%.
- the obtained piece-protecting polarizing film has a thickness of 26 ⁇ m.
- ⁇ Preparation of both protective polarizing films C> The protective film A was bonded to the polarizer of the piece-protecting polarizing film A (the side from which the amorphous PET base material was peeled) through an ultraviolet curable adhesive in the same manner as described above.
- the optical properties of the obtained both protective polarizing films B were a transmittance of 42.8% and a degree of polarization of 99.99%.
- the thickness of the polarizing film C is 87 ⁇ m.
- cross-linking agent 100 parts by weight of the solid content of the acrylic polymer solution is a cross-linking agent mainly composed of a compound having an isocyanate group of 0.5 part (trade name “Coronate L” manufactured by Nippon Polyurethane Co., Ltd.). And 0.075 parts of ⁇ -glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name “KMB-403”) as a silane coupling agent in this order, was prepared.
- Example 1 ⁇ Lamination of surface protective film> A surface protective film was provided on the protective film side of the piece protective polarizing film A.
- As the surface protective film a 38 ⁇ m thick polyester-based resin film (base film) manufactured by Nitto Denko Corporation, product name RP207 was used.
- the surface protective film has a pressure-sensitive adhesive layer (corresponding to a second pressure-sensitive adhesive layer) having a thickness of 15 ⁇ m.
- the pressure-sensitive adhesive solution was applied to the surface of a release film (separator) made of a polyethylene terephthalate film (thickness 38 ⁇ m) subjected to a release treatment so that the thickness after drying was 20 ⁇ m, dried, and then the pressure-sensitive adhesive layer ( Corresponding to the first pressure-sensitive adhesive layer).
- the pressure-sensitive adhesive layer is bonded to the polarizer side of the single protective polarizing film A having a surface protective film, and the optical film of the present invention (polarizing film with a pressure-sensitive adhesive layer having a release film and a surface protective film).
- Example 2 Comparative Examples 1 to 7, Reference Examples 1 and 2
- the release film was the same as Example 1 except that the type of polarizing film, the thickness of the base film of the surface protective film, and the thickness of the release film were changed as shown in Table 1. And the polarizing film with an adhesive layer which has a surface protection film was produced.
- ⁇ Single transmittance T and polarization degree P of polarizer> The single transmittance T and the polarization degree P of the obtained polarizing film were measured using a spectral transmittance measuring device with an integrating sphere (Dot-3c of Murakami Color Research Laboratory).
- the degree of polarization P is the transmittance when two identical polarizing films are overlapped so that their transmission axes are parallel (parallel transmittance: Tp), and overlapped so that their transmission axes are orthogonal to each other. It is calculated
- Polarization degree P (%) ⁇ (Tp ⁇ Tc) / (Tp + Tc) ⁇ 1/2 ⁇ 100
- Each transmittance is represented by a Y value obtained by correcting visibility with a two-degree field of view (C light source) of JIS Z8701, with 100% of the completely polarized light obtained through the Granteller prism polarizer.
- a cellophane tape is attached to the short side edge of a polarizing film with a pressure-sensitive adhesive layer that is bonded to an alkali-free glass. It peeled in parallel with the long side direction of the film at a speed of 0.3 m / min.
- the peel force was measured at 15 mm ⁇ 100 mm (absorption axis direction 10 mm) and 100 mm ⁇ 15 mm (absorption axis direction 100 mm), and the average value was adopted.
- the release force of the release film was 0.16 N / 25 mm in all cases.
- the peel strength of the surface protective film was 0.09 N / 25 mm in all cases.
Abstract
Description
前記偏光フィルムは、厚みが60μm以下であり、かつ、
前記光学フィルムの総厚みにおける中間位置の平面方向を仮想中心面fとする場合に、
前記仮想中心面fと表面保護フィルムとの距離x(μm)と前記仮想中心面fと離型フィルムとの距離y(μm)とが、x-y>-20、の関係にあることを特徴とする光学フィルム、に関する。
前記光学フィルムから離型フィルムを剥離する工程(2)、および、
前記離型フィルムが剥離された前記光学フィルムの第1粘着剤層の側を、光学セルの一方面に貼り合わせる工程(3)を有する光学表示パネルの製造方法、に関する。
本発明では、厚み(総厚み)が60μm以下の偏光フィルムを用いる。前記偏光フィルムの厚みは薄型化の観点から55μm以下、さらには50μm以下のものを用いることができる。前記偏光フィルムを用いるシート・トゥ・パネル方式において、離型フィルムの剥離時に、離型フィルムと粘着剤層の界面ではなく、偏光フィルムと表面保護フィルムの界面において剥離が生じやすく、本発明は、当該偏光フィルムへの適用がより好適である。なお、偏光フィルムの構成としては、例えば、(1)偏光子の両側に保護フィルムがこの順に積層されている構成(両保護偏光フィルム)、(2)偏光子の片側にのみ保護フィルムが積層されている構成(片保護偏光フィルム)等が挙げられる。
偏光子は、ポリビニルアルコール系樹脂を用いたものが使用される。偏光子としては、例えば、ポリビニルアルコール系フィルム、部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルム等の親水性高分子フィルムに、ヨウ素や二色性染料の二色性物質を吸着させて一軸延伸したもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物等ポリエン系配向フィルム等が挙げられる。これらの中でも、ポリビニルアルコール系フィルムとヨウ素などの二色性物質からなる偏光子が好適である。
前記保護フィルムを構成する材料としては、透明性、機械的強度、熱安定性、水分遮断性、等方性などに優れるものが好ましい。例えば、ポリエチレンテレフタレートやポリエチレンナフタレートなどのポリエステル系ポリマー、ジアセチルセルロースやトリアセチルセルロースなどのセルロース系ポリマー、ポリメチルメタクリレートなどのアクリル系ポリマー、ポリスチレンやアクリロニトリル・スチレン共重合体(AS樹脂)などのスチレン系ポリマー、ポリカーボネート系ポリマー等が挙げられる。また、ポリエチレン、ポリプロピレン、シクロ系ないしはノルボルネン構造を有するポリオレフィン、エチレン・プロピレン共重合体の如きポリオレフィン系ポリマー、塩化ビニル系ポリマー、ナイロンや芳香族ポリアミドなどのアミド系ポリマー、イミド系ポリマー、スルホン系ポリマー、ポリエーテルスルホン系ポリマー、ポリエーテルエーテルケトン系ポリマー、ポリフェニレンスルフィド系ポリマー、ビニルアルコール系ポリマー、塩化ビニリデン系ポリマー、ビニルブチラール系ポリマー、アリレート系ポリマー、ポリオキシメチレン系ポリマー、エポキシ系ポリマー、または上記ポリマーのブレンド物なども上記保護フィルムを形成するポリマーの例として挙げられる。これら保護フィルムは、通常、接着剤層により、偏光子に貼り合わせられる。
前記保護フィルムと偏光子は接着剤層、粘着剤層、下塗り層(プライマー層)などの介在層を介して積層される。この際、介在層により両者を空気間隙なく積層することが望ましい。なお、図2においても偏光子1aと保護フィルム1bの介在層は示していない。
第1粘着剤層の形成には、適宜な粘着剤を用いることができ、その種類について特に制限はない。粘着剤としては、ゴム系粘着剤、アクリル系粘着剤、シリコーン系粘着剤、ウレタン系粘着剤、ビニルアルキルエーテル系粘着剤、ポリビニルアルコール系粘着剤、ポリビニルピロリドン系粘着剤、ポリアクリルアミド系粘着剤、セルロース系粘着剤などがあげられる。
離型フィルムは、実用に供されるまで第1粘着剤層を保護する。離型フィルムの構成材料としては、例えば、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、ポリエステルフィルムなどのプラスチックフィルム、紙、布、不織布などの多孔質材料、ネット、発泡シート、金属箔、およびこれらのラミネート体などの適宜な薄葉体などを挙げることができるが、表面平滑性に優れる点からプラスチックフィルムが好適に用いられる。
表面保護フィルムは、光学フィルムにおいて、偏光フィルムの片面(第1粘着剤層を積層していない面)に設けられ、偏光フィルムを保護する。
前記光学フィルムは所定の形状の枚葉状態で準備される(工程(1))。所定の形状としては、例えば、矩形状物が挙げられる。次いで、前記光学フィルムからは、離型フィルムが剥離される(工程(2))。離型フィルムの剥離に際して、前記光学フィルムは、例えば、吸着等により、表面保護フィルム側を固定し、離型フィルムの剥離は、剥離ローラー等を用いて行うことができる(例えば、特開平9-114384号公報等を参照)。
上記工程(1)、次いで工程(2)により離型フィルムが剥離された光学フィルム(表面保護フィルムを有する粘着剤層付光学フィルム)は、工程(3)により、光学セルの一方面に貼り合わせる。工程(3)では前記光学フィルムの第1粘着剤層の側を、光学フィルムに貼り合わせて光学表示パネルを製造する。
本発明の光学フィルムは、実用に際して他の光学層と積層して用いることができる。その光学層については特に限定はないが、例えば反射板や半透過板、位相差板(1/2や1/4などの波長板を含む)、視角補償フィルム、輝度向上フィルムなどの液晶表示装置などの形成に用いられることのある光学層を1層または2層以上用いることができる。
(液晶セル、液晶表示パネル)
液晶セルは、対向配置される一対の基板(第1基板(視認側面)Pa、第2基板(背面)Pb)間に液晶層が封止された構成である。液晶セルは、任意のタイプのものを用いることができるが、高コントラストを実現するためには、垂直配向(VA)モード、面内スイッチング(IPS)モードの液晶セルを用いることが好ましい。液晶表示パネルは、液晶セルの片面または両面に偏光フィルムが貼り合わされたものであり、必要に応じて駆動回路が組込まれる。
別の光学セルとしての有機ELセルは、一対の電極間に電界発光層が挟持された構成である。有機ELセルは、例えば、トップエミッション方式、ボトムエミッション方式、ダブルエミッション方式などの任意のタイプのものを用いることができる。有機EL表示パネルは、有機ELセルに位相差フィルムとともに、本発明の光学フィルム(偏光フィルム)が貼り合わされ、必要に応じて駆動回路が組込まれる。
(偏光子の作製)
吸水率0.75%、Tg75℃の非晶質のイソフタル酸共重合ポリエチレンテレフタレート(IPA共重合PET)フィルム(厚み:100μm)基材の片面に、コロナ処理を施し、このコロナ処理面に、ポリビニルアルコール(重合度4200、ケン化度99.2モル%)およびアセトアセチル変性PVA(重合度1200、アセトアセチル変性度4.6%、ケン化度99.0モル%以上、日本合成化学工業社製、商品名「ゴーセファイマーZ200」)を9:1の比で含む水溶液を25℃で塗布および乾燥して、厚み11μmのPVA系樹脂層を形成し、積層体を作製した。
得られた積層体を、120℃のオーブン内で周速の異なるロール間で縦方向(長手方向)に2.0倍に自由端一軸延伸した(空中補助延伸処理)。
次いで、積層体を、液温30℃の不溶化浴(水100重量部に対して、ホウ酸を4重量部配合して得られたホウ酸水溶液)に30秒間浸漬させた(不溶化処理)。
次いで、液温30℃の染色浴に、偏光板が所定の透過率となるようにヨウ素濃度、浸漬時間を調整しながら浸漬させた。本実施例では、水100重量部に対して、ヨウ素を0.2重量部配合し、ヨウ化カリウムを1.0重量部配合して得られたヨウ素水溶液に60秒間浸漬させた(染色処理)。
次いで、液温30℃の架橋浴(水100重量部に対して、ヨウ化カリウムを3重量部配合し、ホウ酸を3重量部配合して得られたホウ酸水溶液)に30秒間浸漬させた(架橋処理)。
その後、積層体を、液温70℃のホウ酸水溶液(水100重量部に対して、ホウ酸を4重量部配合し、ヨウ化カリウムを5重量部配合して得られた水溶液)に浸漬させながら、周速の異なるロール間で縦方向(長手方向)に総延伸倍率が5.5倍となるように一軸延伸を行った(水中延伸処理)。
その後、積層体を液温30℃の洗浄浴(水100重量部に対して、ヨウ化カリウムを4重量部配合して得られた水溶液)に浸漬させた(洗浄処理)。
以上により、厚み5μmの偏光子を含む光学フィルム積層体を得た。
保護フィルムA:厚み40μmのラクトン環構造を有する(メタ)アクリル樹脂フィルムの易接着処理面にコロナ処理を施して用いた。
保護フィルムB:厚み20μmのラクトン環構造を有する(メタ)アクリル樹脂フィルムの易接着処理面にコロナ処理を施して用いた。
N-ヒドロキシエチルアクリルアミド(HEAA)40重量部とアクリロイルモルホリン(ACMO)60重量部と光開始剤「IRGACURE 819」(BASF社製)3重量部を混合し、紫外線硬化型接着剤を調製した。
上記光学フィルム積層体の偏光子の表面に、上記紫外線硬化型接着剤を硬化後の接着剤層の厚みが1μmとなるように塗布しながら、上記保護フィルムAを貼合せたのち、活性エネルギー線として、紫外線を照射し、接着剤を硬化させた。紫外線照射は、ガリウム封入メタルハライドランプ、照射装置:Fusion UV Systems,Inc社製のLight HAMMER10、バルブ:Vバルブ、ピーク照度:1600mW/cm2、積算照射量1000/mJ/cm2(波長380~440nm)を使用し、紫外線の照度は、Solatell社製のSola-Checkシステムを使用して測定した。次いで、非晶性PET基材を剥離し、薄型偏光子を用いた片保護偏光フィルムAを作製した。得られた片保護偏光フィルムAの光学特性は、単体透過率42.8%、偏光度99.99%であった。得られた片保護偏光フィルムの厚みは46μmである。
上記片保護偏光フィルムAの作製において、前記偏光子(非晶性PET基材を剥離した側)に、保護フィルムAの代わりに保護フィルムBを用いたこと以外は、片保護偏光フィルムBを得た。得られた片保護偏光フィルムBの光学特性は、単体透過率42.8%、偏光度99.99%であった。得られた片保護偏光フィルムの厚みは26μmである。
上記片保護偏光フィルムAの偏光子(非晶性PET基材を剥離した側)に、上記と同様にして紫外線硬化型接着剤を介して、上記保護フィルムAを貼り合わせた。得られた両保護偏光フィルムBの光学特性は、透過率42.8%、偏光度99.99%であった。偏光フィルムCの厚みは、87μmである。
冷却管、窒素導入管、温度計及び撹拌装置を備えた反応容器に、アクリル酸ブチル100部、アクリル酸3部、アクリル酸2-ヒドロキシエチル0.1部および2,2´-アゾビスイソブチロニトリル0.3部を酢酸エチルと共に加えて溶液を調製した。次いで、この溶液に窒素ガスを吹き込みながら撹拌して、55℃で8時間反応させて、重量平均分子量220万のアクリル系ポリマーを含有する溶液を得た。さらに、このアクリル系ポリマーを含有する溶液に、酢酸エチルを加えて固形分濃度を30%に調整したアクリル系ポリマー溶液を得た。
<表面保護フィルムの積層>
上記片保護偏光フィルムAの保護フィルム側には、表面保護フィルムを設けた。表面保護フィルムとして、「日東電工社製、製品名RP207」の厚み38μmのポリエステル系樹脂フィルム(基材フィルム)を用いた。前記表面保護フィルムは、厚さ15μmの粘着剤層(第2粘着剤層に相当する)を有するものである。
上記粘着剤溶液を、剥離処理したポリエチレンテレフタレートフィルム(厚さ38μm)からなる離型フィルム(セパレータ)の表面に、乾燥後の厚みが20μmになるように塗布し、乾燥して、粘着剤層(第1粘着剤層に相当する)を形成した。次いで、表面保護フィルムを有する片保護偏光フィルムAの偏光子の側に、前記粘着剤層を貼り合わせて、本発明の光学フィルム(離型フィルムおよび表面保護フィルムを有する粘着剤層付偏光フィルム)を作製した。
実施例1において、偏光フィルムの種類、表面保護フィルムの基材フィルムの厚み、離型フィルムの厚みを、表1に示すように変えたこと以外は、実施例1と同様にして、離型フィルムおよび表面保護フィルムを有する粘着剤層付偏光フィルムを作製した。
得られた偏光フィルムの単体透過率Tおよび偏光度Pを、積分球付き分光透過率測定器(村上色彩技術研究所のDot-3c)を用いて測定した。
なお、偏光度Pは、2枚の同じ偏光フィルムを両者の透過軸が平行となるように重ね合わせた場合の透過率(平行透過率:Tp)および、両者の透過軸が直交するように重ね合わせた場合の透過率(直交透過率:Tc)を以下の式に適用することにより求められるものである。偏光度P(%)={(Tp-Tc)/(Tp+Tc)}1/2×100
各透過率は、グランテラープリズム偏光子を通して得られた完全偏光を100%として、JIS Z8701の2度視野(C光源)により視感度補整したY値で示したものである。
実施例、比較例および参考例で得られた離型フィルムおよび表面保護フィルムを有する粘着剤層付偏光フィルムについて、25mm×100mm(吸収軸方向が25mm)と100mm×25mm(吸収軸方向が100mm)に裁断し、離型フィルムおよび表面保護フィルムのうち剥離力を測定しない側のフィルムを剥離した後、両面テープ(日東電工社製,両面テープNo.511)にて各々0.5mm厚の無アルカリガラスに貼り合せた。セロハンテープを無アルカリガラスに貼り合わされた粘着剤層付偏光フィルムの短辺端部に貼り付け、予めスタート箇所のみ剥離させた後にテンシロンを用いて、離型フィルムまたは表面保護フィルムを180°ピール・0.3m/min速度でフィルムの長辺方向に平行に剥離した。 なお、15mm×100mm(吸収軸方向が10mm)と100mm×15mm(吸収軸方向が100mm)の各々で剥離力を測定し、その平均値を採用した。
離型フィルムの剥離力は、いずれも0.16N/25mmであった。
表面保護フィルムの剥離力は、いずれも0.09N/25mmであった。
実施例、比較例および参考例で得られた離型フィルムおよび表面保護フィルムを有する粘着剤層付偏光フィルムについて、5mm×15mmに裁断して枚葉状態(サンプル)とした。
前記サンプルの離型フィルム側を上側にし、表面保護フィルム側を下側にして、両面テープ(日東電工社製 両面テープNo.511)にて前記サンプルの表面保護フィルム側をガラスの上に固定した。次いで、エッジ端部よりピックアップテープ(日東電工社製,マスキングテープNo.720)を用いて90°の角度で手剥離により、離型フィルムをサンプルの対角線方向に平行に剥離して、下記基準で評価した。
〇:離型フィルムのみが剥離された。
×:表面保護フィルムと偏光フィルムの界面で剥離された。
前記剥離を5回行って、〇の回数を、回数/n5として、示した。
1、1´ 偏光フィルム
1a 偏光子
1b 保護フィルム
2 第1粘着剤層
3 離型フィルム
4、4´ 表面保護フィルム
41 基材フィルム
42 第2粘着剤層
Claims (12)
- 離型フィルム、第1粘着剤層、偏光フィルムおよび表面保護フィルムがこの順に積層されている枚葉状の光学フィルムであって、
前記偏光フィルムは、厚みが60μm以下であり、かつ、
前記光学フィルムの総厚みにおける中間位置の平面方向を仮想中心面fとする場合に、
前記仮想中心面fと表面保護フィルムとの距離x(μm)と前記仮想中心面fと離型フィルムとの距離y(μm)とが、x-y>-20、の関係にあることを特徴とする光学フィルム。 - 前記距離x(μm)と前記距離yとが、x-y>-10、の関係にあることを特徴とする請求項1記載の光学フィルム。
- 前記離型フィルムの剥離力(1)が、前記表面保護フィルムの剥離力(2)より大きいことを特徴とする請求項1または2記載の両面粘着剤層付偏光フィルム。
- 前記仮想中心面fが、第1粘着剤層または偏光フィルムにあることを特徴とする請求項1~3のいずれかに記載の光学フィルム。
- 前記離型フィルムの厚みが、前記表面保護フィルムの厚みよりも大きいことを特徴とする請求項1~4のいずれかに記載の光学フィルム。
- 前記表面保護フィルムが、基材フィルムおよび第2粘着剤層を有し、当該第2粘着剤層を介して偏光フィルムに積層されていることを特徴とする請求項1~5のいずれかに記載の光学フィルム。
- 前記表面保護フィルムが、自己粘着型のフィルムであることを特徴とする請求項1~5のいずれかに記載の光学フィルム。
- 前記偏光フィルムは、厚みが10μm以下の偏光子を有することを特徴とする請求項1~7のいずれかに記載の光学フィルム。
- 前記偏光フィルムが、偏光子の片面にのみ保護フィルムを有する片保護偏光フィルムであることを特徴とする請求項1~8のいずれかに記載の光学フィルム。
- 請求項1~9のいずれかに記載の光学フィルムから、離型フィルムを剥離することを特徴する離型フィルムの剥離方法。
- 請求項1~9のいずれかに記載の光学フィルムを準備する工程(1)、
前記光学フィルムから離型フィルムを剥離する工程(2)、および、
前記離型フィルムが剥離された前記光学フィルムの第1粘着剤層の側を、光学セルの一方面に貼り合わせる工程(3)を有する光学表示パネルの製造方法。 - 前記光学セルが、液晶セル又は有機ELセルであることを特徴とする請求項11記載の光学表示パネルの製造方法。
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