CN110651205B - Circular polarizing film, circular polarizing film with adhesive layer, and image display device - Google Patents
Circular polarizing film, circular polarizing film with adhesive layer, and image display device Download PDFInfo
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- CN110651205B CN110651205B CN201880031905.1A CN201880031905A CN110651205B CN 110651205 B CN110651205 B CN 110651205B CN 201880031905 A CN201880031905 A CN 201880031905A CN 110651205 B CN110651205 B CN 110651205B
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- film
- circular polarizing
- polarizer
- polarizing film
- retardation film
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- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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- G—PHYSICS
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- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Liquid Crystal (AREA)
Abstract
The present invention relates to a circularly polarizing film comprising a polarizer, a retardation film disposed on one side of the polarizer, and a protective layer disposed on the other side of the polarizer, wherein the retardation film has a function of converting linearly polarized light into circularly or elliptically polarized light, has a thickness of 35 μm or less, and has two surfaces of the retardation film having different loads at which breakage starts in a scratch test, and the polarizer is bonded to the 1 st surface of the retardation film when the side having a higher load at which breakage starts is the 1 st surface and the side having a lower load is the 2 nd surface. The circular polarizing film of the present invention is excellent in impact resistance and reworkability, and can suppress curling.
Description
Technical Field
The present invention relates to a circular polarizing film. The present invention also relates to a circular polarizing film with an adhesive layer, which uses the circular polarizing film. Further, the present invention relates to an image display device using the circular polarizing film or the adhesive layer-attached circular polarizing film. The circular polarizing film of the present invention is suitable for an image display device, and is particularly suitable for an image display device in which a display screen is visually recognized by a polarizing lens such as a polarizing sunglass.
Background
In recent years, opportunities have increased for using image display devices under strong external light, such as mobile phones, smart phones, tablet Personal Computers (PCs), car navigation systems, digital signage, window displays, and the like. When the image display device is used outdoors as described above, when the viewer views the image display device by wearing the polarized sunglasses, the transmission axis direction of the polarized sunglasses and the transmission axis direction of the exit side of the image display device are in a cross nicol state depending on the viewing angle of the viewer, and as a result, the screen may be blackened and the display image may not be visually recognized. In order to solve such a problem, it has been proposed to dispose a circular polarizing film (polarizing film corresponding to a polarizing sunglass) on the visible-side surface of an image display device (patent document 1). Further, the image display device described above is susceptible to external impact such as dropping or collision, and the circular polarizing film is also required to have impact resistance.
When an optical film such as a circular polarizing film is bonded to a liquid crystal cell, the optical film may be peeled off from the liquid crystal panel and the liquid crystal cell may be reused in the case where the bonding position is incorrect and foreign matter enters the bonding surface. In this peeling step, removability (removability) is required to be able to peel the entire optical film from the liquid crystal panel without leaving a paste residue.
In the circular polarizing film, a retardation film having a circularly polarizing function or an elliptically polarizing function may be used as a protective film provided on the polarizer side. As the retardation film, a stretched polycarbonate film and a stretched norbornene polymer film are known. However, although the polycarbonate film and the norbornene-based polymer film have low moisture permeability and very good dimensional stability under a humidity environment, there is a serious problem that the in-plane retardation Re unevenness occurs due to a large photoelastic coefficient when the polycarbonate film is used. In addition, when a norbornene-based film is used as the retardation film on the visible side of an optical unit (for example, a liquid crystal unit) (further, on the visible side of a polarizer), there are the following significant problems: sebum and detergent adhere to the norbornene film, and the norbornene film is cracked or dissolved by a solvent contained in an interlayer resin when the circular polarizing film is fully laminated.
On the other hand, as the retardation film of the circular polarizing film, cellulose ester films such as cellulose acetate film and cellulose acetate propionate film can be used. Since the cellulose ester film has a small photoelastic coefficient, unevenness of in-plane retardation Re is less likely to occur, and generation and dissolution of cracks can be suppressed even when the film is brought into contact with sebum, a detergent, or a solvent (patent document 2). In addition, a retardation film obtained by stretching a cellulose ester film is often used for TV applications, and the thickness thereof is usually 40 μm or more.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2014-16425
Patent document 2: japanese patent laid-open publication No. 2016-177165
Disclosure of Invention
Problems to be solved by the invention
However, in recent image display devices, thinning is required, and thinning is also required for the retardation film. Further, since the retardation film is obtained by stretching, curling is likely to occur, and thinning is also required from the viewpoint of suppressing curling. However, in a circular polarizing film in which a retardation film obtained by stretching a cellulose ester film is bonded to a polarizer, there is a problem that peeling occurs in the vicinity of the bonding surface between the retardation film and the polarizer at the time of external impact or at the time of rework.
An object of the present invention is to provide a circular polarizing film having a polarizer, a retardation film disposed on one side of the polarizer, and a protective layer disposed on the other side of the polarizer, which is excellent in impact resistance and reworkability, and can suppress curling.
Another object of the present invention is to provide a circular polarizing film with an adhesive layer using the circular polarizing film, and an image display device using the circular polarizing film or the circular polarizing film with an adhesive layer.
Means for solving the problems
The present inventors have conducted extensive studies and, as a result, have found that the above problems can be solved by the following circular polarizing film and the like, and have completed the present invention.
That is, the present invention relates to a circular polarizing film comprising a polarizer, a retardation film disposed on one side of the polarizer, and a protective layer disposed on the other side of the polarizer,
the retardation film has a function of converting linearly polarized light into circularly polarized light or elliptically polarized light, has a thickness of 35 μm or less, and,
the two surfaces of the retardation film have different loads at the start of fracture in a scratch test, and when the higher side of the load at the start of fracture is the 1 st surface and the lower side is the 2 nd surface, the polarizer is bonded to the 1 st surface of the retardation film.
In the circular polarizing film, the 1 st surface of the retardation film preferably has a fracture initiation load of 55mN or more.
The circularly polarizing film may have a surface functional layer on the 2 nd surface of the retardation film.
In the circular polarizing film, an angle formed by the absorption axis of the polarizer and the slow axis of the retardation film is preferably 35 ° to 55 °. When the circularly polarizing film is in a long form, the angle formed between the slow axis of the retardation film and the longitudinal direction is preferably 35 ° to 55 °.
In the circular polarizing film, it is preferable that the retardation film is a stretched product of a resin film formed on a cast body by a solution casting method, and a cast body-side surface of the resin film is the 1 st surface.
In the circular polarizing film, a cellulose ester film may be used as the retardation film.
In the circular polarizing film, a circular polarizing film in which the polarizer, the retardation film, and the protective layer are bonded to each other with an adhesive layer may be used.
The present invention also relates to a circular polarizing film with an adhesive layer, which comprises the circular polarizing film and the adhesive layer.
The present invention also relates to an image display device including an original polarizing film or a circular polarizing film with an adhesive layer on a viewing side of an optical unit, wherein the retardation film is disposed on the viewing side of the polarizer.
ADVANTAGEOUS EFFECTS OF INVENTION
Polycarbonate films and norbornene polymer films are generally formed by a melt extrusion method, and the physical properties of both surfaces of the film obtained by the film forming method are not different. On the other hand, a film forming method using a solution casting method is generally used for the cellulose ester film. In the solution casting method, a resin solution (dope) is poured into a drum (casting drum) having a smooth surface and adhered to a smooth belt made of stainless steel, and the solvent is evaporated by a step of heating the resin solution to form a film. In this solution casting method, since the desolvation proceeds rapidly on the side (air side) not in contact with the belt or drum surface, the air side is more likely to be solidified (a substance having a skin on the surface) than the side in contact with the belt or drum surface, particularly in the case of forming a film. As a result, it was found that the film obtained by the solution casting method had different physical properties on both sides. In addition, when a film obtained by a solution casting method is bonded to another film, it is also known that the film is bonded to the air side for convenience.
The retardation film used for the circularly polarizing film is obtained by obliquely stretching the film so that the angle formed between the width direction and the slow axis in the plane is within a predetermined range. Therefore, it is found that when a film having two different physical properties as described above is subjected to high stretching by the above-described oblique stretching, the air side of the resulting retardation film is mechanically brittle as compared with the opposite side. In particular, in the case of a thin film, the air side is mechanically weak. As a result, it is presumed that peeling occurs at the time of impact or at the time of rework when a thin retardation film is bonded to a polarizer.
According to the above findings, in the circular polarizing film of the present invention, when the retardation films having different physical properties (having a function of converting linearly polarized light into circularly polarized light or elliptically polarized light) are disposed on both surfaces of the polarizer, the side having strong mechanical properties is bonded to the polarizer, that is, the side having a high breakdown initiation load in the scratch test is bonded to the polarizer. In view of impact resistance and reworkability, the film is not preferably thinned, but in the present invention, by adopting such a configuration, when a retardation film having a thickness of 35 μm or less is used, aggregation destruction in the vicinity of the contact surface between the retardation film and the polarizer is less likely to occur even at the time of impact or at the time of reworking, and a circular polarizing film having excellent impact resistance and reworkability can be provided. In the present invention, by using a retardation film having a thickness of 35 μm or less as the retardation film, curling can be suppressed.
Drawings
Fig. 1 is a schematic cross-sectional view showing an example of a structural cross section of a circular polarizing film of the present invention.
Fig. 2 is an image showing a scratch mark before the start of fracture (non-fractured portion) in the fracture initiation load measurement.
Fig. 3 is an image showing a scratch mark at the fracture initiation point of the fracture initiation load measurement.
Description of the symbols
F circular polarizing film
1 polarizer
2 phase difference film
3 protective layer
4 surface functional layer
Detailed Description
(definitions of wording and symbols)
The terms and symbols in the present specification are defined as follows.
(1) Refractive index (nx, ny, nz)
"nx" is a refractive index in a direction in which the in-plane refractive index is maximized (i.e., the slow axis direction), "ny" is a refractive index in a direction orthogonal to the slow axis in the plane (i.e., the fast axis direction), and "nz" is a refractive index in the thickness direction.
(2) In-plane retardation (Re)
"Re (λ)" is the in-plane retardation of the film measured at 23 ℃ with light of wavelength λ nm. For example, "Re (450)" is the in-plane retardation of the film measured at 23 ℃ with light having a wavelength of 450 nm. When the thickness of the film is d (nm), the following equation is used: re (λ) was obtained as (nx-ny) × d.
"Rth (. lamda)" is a retardation in the thickness direction of the film measured at 23 ℃ with light having a wavelength of 550 nm. For example, "Rth (450)" is a phase difference in the thickness direction of the film measured at 23 ℃ with light having a wavelength of 450 nm. When the thickness of the film is d (nm), the following equation is used: rth (λ) is obtained as (nx-nz) × d.
(4) Coefficient of Nz
The Nz coefficient is obtained by Nz ═ Rth/Re.
(5) Substantially orthogonal or parallel
The expressions "substantially orthogonal" and "substantially orthogonal" include the case where the angle formed by the 2 directions is 90 ° ± 10 °, preferably 90 ° ± 7 °, and more preferably 90 ° ± 5 °. The expressions "substantially parallel" and "substantially parallel" include the case where the angle formed by the 2 directions is 0 ° ± 10 °, preferably 0 ° ± 7 °, and more preferably 0 ° ± 5 °. In the present specification, the term "orthogonal" or "parallel" may include a substantially orthogonal state or a substantially parallel state.
(6) Angle of rotation
In the present specification, when an angle is referred to, the angle includes both clockwise and counterclockwise angles unless otherwise specified.
(7) Strip shape
The "elongated shape" means an elongated shape having a length sufficiently long with respect to a width, and includes, for example, an elongated shape having a length 10 times or more, preferably 20 times or more with respect to a width.
< integral constitution of polarizing film >
Fig. 1 is a schematic cross-sectional view showing an example of a structural cross section of a circular polarizing film of the present invention. The circular polarizing film F of fig. 1 includes a polarizer 1, a retardation film 2 disposed on one side of the polarizer 1, and a protective layer 3 disposed on the other side of the polarizer 1. The retardation film 2 has a function of converting linearly polarized light into circularly polarized light or elliptically polarized light. Accordingly, the circular polarizing film of the present invention refers to a circular polarizing film or an elliptical polarizing film. The circular polarizing film F is typically disposed on the viewing side of the image display device. In this case, the retardation film 2 is disposed so as to be on the visible side. With the above-described configuration, excellent visibility can be achieved even when a display screen is viewed through a polarizing lens such as a polarized sunglass lens. Therefore, the circular polarizing film F is also suitable for an image display device that can be used outdoors.
As the retardation film 2, a retardation film having different fracture initiation loads on both sides in the scratch test was used. In the retardation film 2, the side on which the breakdown start load is high is the 1 st surface 2a, and the side on which the breakdown start load is low is the 2 nd surface 2 b. As shown in fig. 1, a polarizer 1 is bonded to the 1 st surface 2a side of the retardation film 2.
The circularly polarizing film F may further include a surface functional layer 4 on the 2 nd surface 2b (the side opposite to the polarizer 1) of the retardation film 2, as necessary. The circular polarizing film F may be provided with another retardation film (not shown). The number, arrangement position, optical characteristics (for example, a refractive index ellipsoid, in-plane retardation, thickness direction retardation, wavelength dispersion characteristics), mechanical characteristics, and the like of the other retardation films can be appropriately set according to the purpose.
The polarizer 1 and the retardation film 2 are laminated such that the absorption axis of the polarizer 1 and the slow axis of the retardation film 2 are at a predetermined angle. The angle formed by the absorption axis of the polarizer 1 and the slow axis of the retardation film 2 is preferably 35 ° to 55 °, more preferably 38 ° to 52 °, still more preferably 40 ° to 50 °, particularly preferably 42 ° to 48 °, and most preferably about 45 °. By disposing the retardation film 2 on the viewing side of the polarizer 1 in such an axial relationship, excellent visibility can be achieved even when a display screen is viewed through a polarizing lens such as a polarizing sunglass. Therefore, the polarizing film according to the embodiment of the present invention can be suitably used also in an image display device that can be used outdoors.
The circular polarizing film F may be in a single sheet form or in a long form (e.g., a roll form). When the circular polarizing film F is in a long shape, the absorption axis direction of the long polarizer may be the longitudinal direction or the width direction. Preferably, the absorption axis direction of the polarizer is the longitudinal direction. This is because the polarizer is easy to manufacture, and as a result, the circular polarizing film is excellent in manufacturing efficiency. When the circularly polarizing film is in a long form, the angle θ formed between the slow axis of the retardation film 2 and the longitudinal direction is preferably 35 ° to 55 °, more preferably 38 ° to 52 °, still more preferably 40 ° to 50 °, particularly preferably 42 ° to 48 °, and most preferably about 45 °. As described later, by forming a retardation film constituting a retardation film by oblique stretching, a long retardation film (retardation film) having a slow axis in an oblique direction can be formed, and as a result, a long circularly polarizing film can be realized. Such a long circular polarizing film can be produced roll-to-roll, and therefore, the productivity is very excellent.
The total thickness of the circular polarizing film is typically 40 to 300. mu.m, preferably 40 to 160. mu.m, more preferably 50 to 140. mu.m, and still more preferably 60 to 120. mu.m. According to the embodiment of the present invention, a circular polarizing film which can suppress curling well although its thickness is very thin can be obtained as such. The total thickness of the circularly polarizing film is the total thickness of the polarizer, the retardation film, the protective layer, the surface functional layer when present, and the adhesive layer for laminating them.
Hereinafter, each layer constituting the circular polarizing film according to the embodiment of the present invention will be described.
< polarizer >
Any suitable polarizer may be used as the polarizer 1. For example, the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
Specific examples of polarizers made of a single-layer resin film include: examples of the polyolefin-based alignment films include polarizing lenses obtained by subjecting hydrophilic polymer films such as polyvinyl alcohol (PVA) -based resin films, partially formalized PVA-based resin films, and ethylene-vinyl acetate copolymer-based partially saponified films to dyeing treatment and stretching treatment with a dichroic substance such as iodine or a dichroic dye, polyvinyl alcohol (PVA) dehydrated products, polyvinyl chloride (pvc) desalted and the like. From the viewpoint of excellent optical properties, a polarizer obtained by uniaxially stretching a PVA-based resin film dyed with iodine is preferably used.
The dyeing with iodine is performed by, for example, immersing the PVA-based resin film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. The stretching may be performed after the dyeing treatment, or may be performed while dyeing. In addition, dyeing may be performed after stretching. The PVA-based resin film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, and the like as necessary. For example, by immersing the PVA-based resin film in water and washing it with water before dyeing, not only stains and antiblocking agents on the surface of the PVA-based resin film can be washed but also the PVA-based resin film can be swollen to prevent uneven dyeing and the like.
Specific examples of the polarizer obtained using the laminate include: a laminate of a resin substrate and a PVA type resin layer (PVA type resin film) laminated on the resin substrate, or a polarizer obtained by using a laminate of a resin substrate and a PVA type resin layer formed on the resin substrate by coating. A polarizer obtained by using a laminate of a resin substrate and a PVA type resin layer formed on the resin substrate by coating can be produced, for example, by the following method: coating the PVA resin solution on a resin base material, drying the resin base material, and forming a PVA resin layer on the resin base material to obtain a laminated body of the resin base material and the PVA resin layer; the laminate was stretched and dyed to prepare a polarizer from the PVA type resin layer. In the present embodiment, the stretching typically includes immersing the laminate in an aqueous boric acid solution to perform stretching. If necessary, the stretching may further include stretching the laminate at a high temperature (for example, 95 ℃ or higher) in a gas atmosphere before the stretching in the aqueous boric acid solution. The obtained resin base material/polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer for the polarizer), or the resin base material may be peeled off from the resin base material/polarizer laminate and an arbitrary appropriate protective layer corresponding to the object may be laminated on the peeled surface. The details of the method for producing such a polarizer are described in, for example, japanese patent laid-open publication No. 2012 and 73580. The entire disclosure of this publication is incorporated herein by reference.
The thickness of the polarizer is preferably 15 μm or less, more preferably 13 μm or less, still more preferably 10 μm, and particularly preferably 8 μm or less. The lower limit of the thickness of the polarizer is 2 μm in one embodiment and 3 μm in another embodiment. According to the embodiment of the present invention, even if the thickness of the polarizer is so extremely thin, the curling when heating the polarizing film can be suppressed well.
The polarizer preferably exhibits dichroism of absorption at any wavelength of 380nm to 780 nm. The polarizer preferably has a monomer transmittance of 42.0% to 45.5%, more preferably 42.5% to 45.0%. According to the present invention, a polarizing film which is very thin and can be suppressed in curling can be realized, and further, excellent monomer transmittance as described above can be realized in such a polarizing film.
The degree of polarization of the polarizer is 98% or more, preferably 98.5% or more, and more preferably 99% or more, as described above. According to the present invention, a polarizing film which is very thin and can be suppressed in curling can be realized, and further, such a polarizing film can be provided with an excellent degree of polarization as described above.
< retardation film >
As described above, the retardation film 2 has a function of converting linearly polarized light into circularly polarized light or elliptically polarized light. That is, the refractive index characteristic of the retardation film 2 typically exhibits a relationship of nx > ny. The in-plane retardation Re (550) of the retardation film is preferably 80nm to 160nm, more preferably 90nm to 120 nm. When the in-plane retardation is within such a range, a retardation film having appropriate elliptical polarizing properties can be obtained with excellent productivity and at an appropriate cost. As a result, a polarizing film capable of ensuring good visibility even when a display screen is observed through a polarizing lens such as a polarizing sunglass can be obtained with excellent productivity and at a suitable cost.
The retardation film 2 can exhibit any suitable index ellipsoid as long as it has a relationship of nx > ny. Preferably, the refractive index ellipsoid of the retardation film exhibits a relationship of nx > ny ≧ nz. The Nz coefficient of the retardation film is preferably 1 to 2, more preferably 1 to 1.5, and still more preferably 1 to 1.3.
The retardation film 2 is made of any appropriate retardation film that can satisfy the optical characteristics described above. In addition, as the retardation film 2, a retardation film having different fracture initiation loads on both sides in the scratch test was used. As described above, in the retardation film 2, the side having a high breakdown start load is the 1 st surface 2a, and the side having a low breakdown start load is the 2 nd surface 2 b. The fracture initiation load on the 1 st surface 2a is preferably 55mN or more. When the above-mentioned initial breaking load is 55mN or more, the cohesive failure in the vicinity of the surface of the 1 st surface 2a is less likely to occur, and the impact resistance and the reworkability of the circular polarizing film obtained by bonding to the polarizer are satisfied, which is preferable. The destruction initiation load of the 1 st surface 2a is more preferably 58mN or more, still more preferably 60mN or more, and still more preferably 70mN or more.
As a resin for forming the retardation film, a cellulose ester resin (hereinafter, also simply referred to as cellulose ester) is typically used.
Specific examples of the cellulose ester include (di, tri) cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose phthalate. Preferred are cellulose triacetate, cellulose diacetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, and cellulose acetate butyrate. The cellulose esters may be used alone or in combination.
Cellulose ester is a polymer (polymer) obtained by esterifying a part or all of free hydroxyl groups (hydroxyl groups) at positions 2, 3 and 6 in a glucose unit constituting cellulose by β -1, 4-glycosidic bonds with an acyl group such as acetyl group or propionyl group. Here, the "degree of substitution with acyl" refers to the sum of the proportions of esterified hydroxyl groups at the 2-, 3-and 6-positions of glucose in the repeating unit. Specifically, the degree of substitution 1 is defined as the degree of 100% esterification of the hydroxyl groups at each of the 2-, 3-and 6-positions of cellulose. Therefore, when all of the 2-, 3-and 6-positions of the cellulose are esterified by 100%, the substitution degree reaches 3 at the maximum. The "average degree of acyl substitution" refers to the degree of acyl substitution represented by the average value of each unit of the degrees of acyl substitution of a plurality of glucose units constituting the cellulose ester resin. The degree of acyl substitution can be determined according to ASTM-D817-96.
Examples of the acyl group include: acetyl, propionyl, butyryl, heptanoyl, hexanoyl, octanoyl, decanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, hexadecanoyl, octadecanoyl, isobutyryl, tert-butyryl, cyclohexanecarbonyl, oleoyl, benzoyl, naphtylcarbonyl, cinnamoyl.
In one embodiment, when the substitution degree of acetyl group of the cellulose ester resin is X and the substitution degree of propionyl group is Y, X and Y preferably satisfy the following formulae (1) and (2).
Formula (1): 2.0-2.8 of (X + Y)
Formula (2): y is more than or equal to 0 and less than or equal to 1.0
More preferably, the cellulose ester resin satisfying the above formulae (1) and (2) contains a cellulose ester resin satisfying the following formulae (1a) and (2) and a cellulose ester resin satisfying the following formulae (1 b).
Formula (1 a): 2.0-2.5 of (X + Y)
Formula (1 b): the ratio of (X + Y) is more than or equal to 2.5 and less than or equal to 2.8.
The "degree of substitution with acetyl group" and the "degree of substitution with propionyl group" are more specific indices of the degree of substitution with acyl group described above, and the "degree of substitution with acetyl group" indicates the sum of the proportions of esterification of the hydroxyl group at the 2-, 3-and 6-positions of glucose in the repeating unit with acetyl group, and the "degree of substitution with propionyl group" indicates the sum of the proportions of esterification of the hydroxyl group at the 2-, 3-and 6-positions of glucose in the repeating unit with propionyl group.
The cellulose ester resin preferably has a molecular weight distribution (weight average molecular weight Mw/number average molecular weight Mn) of 1.5 to 5.5, more preferably 2.0 to 5.0, still more preferably 2.5 to 5.0, and particularly preferably 3.0 to 5.0.
As the cellulose as a raw material of the cellulose ester resin, any appropriate cellulose can be used. Specific examples thereof include cotton linter, wood pulp and kenaf. Cellulose ester resins obtained from different raw materials may also be used in combination.
The cellulose ester resin may be produced by any suitable method. As a representative example, a method including the following steps: cellulose as a raw material, a predetermined organic acid (e.g., acetic acid, propionic acid), an acid anhydride (e.g., acetic anhydride, propionic anhydride), and a catalyst (e.g., sulfuric acid) are mixed, and the mixture is esterified with cellulose, followed by reaction until cellulose triester is obtained. In cellulose triesters, three hydroxyl groups (hydroxyl groups) of the glucose unit are replaced by acyl groups of organic acids. When two kinds of organic acids are used simultaneously, a mixed ester type cellulose ester (for example, cellulose acetate propionate or cellulose acetate butyrate) can be produced. Next, by hydrolyzing the cellulose triester, a cellulose ester having a desired degree of acyl substitution is synthesized. Then, the cellulose ester resin is obtained through the steps of filtration, precipitation, washing with water, dehydration, drying and the like.
The retardation film 2 (retardation film) can be typically produced by stretching a resin film formed of the resin as described above in at least one direction.
As a method for forming the resin film, any appropriate method can be adopted. Examples thereof include: melt extrusion (e.g., T-die molding), cast coating (e.g., casting), calendering, hot pressing, coextrusion, co-melting, multilayer extrusion, inflation, and the like. T-die forming, casting and inflation are preferably used.
The resin film used for the retardation film used in the present invention (a retardation film having different fracture initiation loads on both sides in the scratch test) is preferably a resin film obtained by a solution casting method. In the solution casting method, a resin solution (dope) is poured into a casting body (casting drum or smooth belt made of stainless steel) having a smooth surface, and the resin solution is adhered to the casting body, and the casting body is heated to evaporate a solvent, thereby forming a film. In this solution casting method, the desolvation proceeds rapidly on the side not in contact with the above cast body (air side), and therefore, the fracture initiation load of the obtained resin film is smaller on the air side than on the cast body side. In the retardation film obtained by stretching the resin film obtained by the solution casting method, the cast-side surface of the resin film is the 1 st surface.
The thickness of the resin film (unstretched film) may be set to any appropriate value depending on desired optical characteristics, stretching conditions to be described later, and the like. Preferably 50 to 250 μm, more preferably 80 to 200 μm.
The stretching may be performed by any suitable stretching method and stretching conditions (e.g., stretching temperature, stretching ratio, and stretching direction). Specifically, various stretching methods such as free end stretching, fixed end stretching/free end shrinking, and fixed end shrinking may be used alone, or the above-described various stretching methods may be used simultaneously or sequentially. The stretching direction may be performed in various directions and dimensions such as a horizontal direction, a vertical direction, a thickness direction, and a diagonal direction. The temperature for stretching is preferably in the range of glass transition temperature (Tg). + -. 20 ℃ of the resin film.
By appropriately selecting the stretching method and the stretching conditions, a retardation film (as a result, a retardation film) having the desired optical properties (for example, a refractive index ellipsoid, an in-plane retardation, and an Nz coefficient) can be obtained.
In one embodiment, the retardation film 2 is produced by uniaxially stretching or fixed-end uniaxially stretching a resin film. Specific examples of the uniaxial stretching include a method in which the resin film is stretched in the longitudinal direction (longitudinal direction) while being advanced in the longitudinal direction. As another specific example of the uniaxial stretching, a method of stretching in the transverse direction using a tenter is cited. The stretch ratio is preferably 10% to 500%.
In another embodiment, the retardation film 2 is produced by continuously stretching a long resin film in a direction of an angle θ with respect to the longitudinal direction. By employing oblique stretching, a long stretched film having an orientation angle of the angle θ with respect to the longitudinal direction of the film can be obtained, and for example, a roll-to-roll can be employed in the lamination with a polarizer, whereby the production process can be simplified. The angle θ is as described above.
As the stretching machine used for the oblique stretching, for example, a tenter type stretching machine capable of applying a feeding force, a stretching force or a drawing force at different speeds in the lateral direction and/or the longitudinal direction can be cited. The tenter type stretching machine includes a transverse uniaxial stretching machine, a simultaneous biaxial stretching machine, and the like, but any suitable stretching machine may be used as long as it can continuously stretch the long resin film obliquely.
Examples of the method of oblique stretching include the methods described in, for example, Japanese patent application laid-open Nos. 50-83482, 2-113920, 3-182701, 2000-9912, 2002-86554 and 2002-22944.
The thickness of the retardation film (for example, the stretched film) is 35 μm or less. When the thickness is larger, the shrinkage and expansion tend to be larger, and when the thickness exceeds 40 μm, the warpage amount (curl) of the panel with heat and moisture reliability becomes larger. The thickness is preferably 38 μm or less, and more preferably 35 μm or less. On the other hand, when the thickness is made thin, the load on the side (first side) having a large fracture initiation load is also reduced, and the peeling force is reduced, and therefore, the thickness is preferably 15 μm or more, and more preferably 20 μm or more.
As the retardation film constituting the retardation film 2, a commercially available film may be used as it is, or a commercially available film may be subjected to 2 processing (for example, stretching treatment or surface treatment) according to the purpose.
The surface of the retardation film 2 on the polarizer 1 side may be subjected to surface treatment. Examples of the surface treatment include: corona treatment, plasma treatment, flame treatment, primer coating treatment and saponification treatment. Examples of the corona treatment include a method in which discharge is performed in atmospheric air by a corona treatment machine. The plasma treatment may be performed, for example, by discharging the plasma in atmospheric air using a plasma discharge apparatus. The flame treatment may be, for example, a method of bringing the film surface into direct contact with a flame. Examples of the primer coating treatment include a method in which an isocyanate compound, a silane coupling agent, and the like are diluted with a solvent and the diluted solution is thinly coated. Examples of the saponification treatment include immersion in an aqueous sodium hydroxide solution. Corona treatment, plasma treatment are preferred.
< protective layer >
The protective layer 3 is formed of any appropriate film that can be used as a protective layer for a polarizer. Specific examples of the material to be the main component of the film include cellulose resins such as Triacetylcellulose (TAC), polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyamides such as polyvinyl alcohols, polycarbonates, nylons and aromatic polyamides, polyolefins such as polyimides, polyether sulfones, polysulfones, polystyrenes, polynorbornenes and ethylene-propylene copolymers, cyclic olefins having a cyclic or norbornene structure, (meth) acrylic acids, transparent resins such as acetates, and the like. Further, thermosetting resins such as (meth) acrylic resins, urethane resins, (meth) acrylic urethane resins, epoxy resins, silicone resins, and ultraviolet-curable resins can be mentioned. Further, for example, a glassy polymer such as a silicone polymer can be cited.
The (meth) acrylic resin preferably has a Tg (glass transition temperature) of 115 ℃ or higher, more preferably 120 ℃ or higher, still more preferably 125 ℃ or higher, and particularly preferably 130 ℃ or higher, because the durability can be improved. The upper limit of the Tg of the (meth) acrylic resin is not particularly limited, and is preferably 170 ℃ or lower from the viewpoint of moldability and the like.
As the (meth) acrylic resin, any appropriate (meth) acrylic resin can be used within a range not impairing the effects of the present invention. Examples thereof include poly (meth) acrylates such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymers, methyl methacrylate- (meth) acrylic acid ester copolymers, methyl methacrylate-acrylic acid ester- (meth) acrylic acid copolymers, methyl (meth) acrylate-styrene copolymers (such as MS resins), and polymers having alicyclic hydrocarbon groups (such as methyl methacrylate-cyclohexyl methacrylate copolymers and methyl methacrylate- (meth) acrylic acid norbornyl ester copolymers). Preferred examples thereof include poly (meth) acrylic acid C such as poly (meth) acrylic acid methyl ester1-6An alkyl ester. More preferably, the resin is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
Specific examples of the (meth) acrylic resin include: ACRYPET VH, ACRYPET VRL20A manufactured by Mitsubishi Rayon Co., Ltd., (meth) acrylic resins having a cyclic structure in the molecule described in Japanese unexamined patent publication No. 2004-70296, and high Tg (meth) acrylic resins obtained by intramolecular crosslinking and intramolecular cyclization reactions.
As the (meth) acrylic resin, a (meth) acrylic resin having a lactam ring structure is particularly preferable in terms of having high heat resistance, high transparency, and high mechanical strength.
Examples of the (meth) acrylic resin having a lactam ring structure include (meth) acrylic resins having a lactam ring structure described in, for example, Japanese patent application laid-open Nos. 2000-230016, 2001-151814, 2002-120326, 2002-254544 and 2005-146084.
The mass average molecular weight (also referred to as a weight average molecular weight) of the (meth) acrylic resin having a lactam ring structure is preferably 1000 to 2000000, more preferably 5000 to 1000000, still more preferably 10000 to 500000, and particularly preferably 50000 to 500000.
The Tg (glass transition temperature) of the (meth) acrylic resin having a lactam ring structure is preferably 115 ℃ or higher, more preferably 125 ℃ or higher, still more preferably 130 ℃ or higher, particularly preferably 135 ℃ or higher, and most preferably 140 ℃ or higher, because the durability can be made excellent. The upper limit of the Tg of the (meth) acrylic resin having a lactam ring structure is not particularly limited, and is preferably 170 ℃ or lower from the viewpoint of moldability and the like.
In the present specification, "(meth) acrylic" means acrylic and/or methacrylic.
The protective layer 3 is preferably optically isotropic. In the present specification, "optically isotropic" means that the in-plane retardation Re (550) is 0nm to 10nm and the retardation Rth (550) in the thickness direction is-10 nm to +10 nm.
The thickness of the protective layer is preferably 5 μm to 60 μm, and more preferably 10 μm to 40 μm.
< surface functional layer >
The retardation film 2 may be provided with a surface functional layer 4 on the 2 nd surface. Examples of the surface functional layer include a hard coat layer, an antireflection layer, an adhesion-preventing layer, a diffusion layer, and an antiglare layer. The functional layers such as the hard coat layer, the antireflection layer, the adhesion preventing layer, the diffusion layer, and the antiglare layer may be provided as a layer different from the retardation film, in addition to the retardation film itself.
As the surface functional layer, for example, a hard coat layer can be suitably used. The hard coat layer has a function of imparting chemical resistance, scratch resistance, and surface smoothness to the circularly polarizing film and improving dimensional stability under high temperature and high humidity. As the hard coat layer, any suitable configuration can be adopted. The hard coat layer is, for example, a cured layer of any suitable ultraviolet curable resin. Examples of the ultraviolet curable resin include: acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, epoxy resins, and the like. The glass transition temperature of the resin constituting the hard coat layer is preferably 120 to 300 ℃, more preferably 130 to 250 ℃. Within such a range, a polarizing film having excellent dimensional stability at high temperature can be obtained. The hard coat layer may also contain any suitable additive as required. Typical examples of the additive include inorganic fine particles and/or organic fine particles.
The details of the hard coat layer are described in, for example, japanese patent application laid-open No. 2007-171943, the description of which is incorporated herein by reference.
The thickness of the surface functional layer 4 is preferably 10 μm or less, more preferably 1 μm to 8 μm, and still more preferably 2 μm to 7 μm.
< adhesive layer >
Any appropriate adhesive layer (not shown) may be used for bonding the layers constituting the circular polarizing film according to the embodiment of the present invention. The adhesive layer may be an adhesive layer or an adhesive layer. The adhesive layer is formed of an adhesive. The type of the adhesive is not particularly limited, and various adhesives can be used. The adhesive layer is not particularly limited as long as it is optically transparent, and various types of adhesives such as aqueous, solvent, hot melt, and active energy ray curable adhesives can be used as the adhesive, with an aqueous adhesive or an active energy ray curable adhesive being preferred.
Typically, the polarizer 1, the retardation film 2, and the protective layer 3 are bonded together with an aqueous adhesive. As the aqueous adhesive, any suitable aqueous adhesive can be used. An aqueous adhesive containing a PVA-based resin is preferably used. From the viewpoint of adhesiveness, the average polymerization degree of the PVA-based resin contained in the aqueous adhesive is preferably about 100 to 5500, and more preferably 1000 to 4500. From the viewpoint of adhesiveness, the average saponification degree is preferably about 85 mol% to 100 mol%, more preferably 90 mol% to 100 mol%.
The PVA-based resin contained in the aqueous adhesive preferably contains an acetoacetyl group, because the adhesive property between the polarizer and the retardation film and the protective layer is excellent and the durability is excellent. The acetoacetyl group-containing PVA-based resin can be obtained by, for example, reacting the PVA-based resin with acetyl ketene by any method. The acetoacetyl group modification ratio of the acetoacetyl group-containing PVA-based resin is typically 0.1 mol% or more, preferably about 0.1 mol% to 40 mol%, more preferably 1 mol% to 20 mol%, and particularly preferably 1 mol% to 7 mol%. The acetoacetyl group modification ratio is a value measured by NMR.
The solid content concentration of the aqueous adhesive is preferably 6% by weight or less, more preferably 0.1 to 6% by weight, and still more preferably 0.5 to 6% by weight. When the solid content concentration is in such a range, there is an advantage that the size control ratio of the polarizing plate can be easily controlled. When the solid content concentration is too low, the moisture content of the obtained polarizing film increases, and the dimensional change may increase depending on the drying conditions. If the solid content concentration is too high, the viscosity of the adhesive increases, and the productivity of the polarizing film may become insufficient.
The thickness of the adhesive layer is preferably 0.01 to 7 μm, more preferably 0.05 to 5 μm, still more preferably 0.05 to 2 μm, and particularly preferably 0.1 to 1 μm. If the thickness of the adhesive layer is too small, the cohesive force of the adhesive itself may not be obtained, and the adhesive strength may not be obtained. If the thickness of the adhesive layer is too large, the circular polarizing film may not have satisfactory durability.
The circular polarizing film F may have an adhesive layer (not shown) on one side or both sides. For example, by providing an adhesive layer in advance on the protective layer 3 side of the circular polarizing film F, it is possible to easily attach the film to another optical member (e.g., a liquid crystal cell, an organic EL panel). A release film is preferably attached to the surface of the pressure-sensitive adhesive layer until use. On the other hand, the pressure-sensitive adhesive layer on the visible side (the retardation film 2 side) can be applied to, for example, an input device such as a touch panel on the visible side used in an image display device, a transparent substrate such as a cover glass or a plastic cover, and the like.
< method for producing circular polarizing film >
An example of the method for manufacturing a circular polarizing film according to the embodiment of the present invention will be briefly described with reference to only characteristic portions. The manufacturing method comprises the following steps: manufacturing a laminated body having a polarizer 1, a retardation film 2 arranged on one side of the polarizer 1, and a protective layer 3 arranged on the other side of the polarizer 1; and heating the laminate at a temperature of, for example, 85 ℃ or higher (hereinafter, may be referred to as high-temperature heating). The heating temperature for high-temperature heating is preferably 86 ℃ or higher. The upper limit of the heating temperature for the high-temperature heating is, for example, 100 ℃. The heating time for the high-temperature heating is preferably 3 to 10 minutes, and more preferably 3 to 6 minutes. The laminate may be heated at a temperature of less than 85 deg.c (low temperature heating) before and/or after the high temperature heating. The heating temperature and heating time for the low-temperature heating can be appropriately set according to the purpose and the desired properties of the obtained polarizing film. The high-temperature heating and/or the low-temperature heating simultaneously serves as a drying treatment of the adhesive in the lamination of the polarizer, the retardation film (retardation film), and the protective layer (protective film). The polarizer, the retardation film (retardation film), and the protective layer (protective film) may be formed as described above, or any appropriate method may be used. In addition, any appropriate method may be used for laminating the polarizer, the retardation film (retardation film), and the protective layer (protective film).
< image display device >
The image display device according to the embodiment of the present invention includes a circular polarizing film on the visible side of an optical unit. The circularly polarizing film is disposed so that the retardation film is closer to the viewing side than the polarizer. Typical examples of image display devices including an optical unit include liquid crystal display devices and organic Electroluminescence (EL) display devices. Such an image display device can realize excellent visibility even when a display screen is observed through a polarizing lens such as a polarizing sunglass by providing the above polarizing film on the visible side. Therefore, such an image display device can be suitably used even outdoors.
Examples
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The evaluation items in the examples are as follows.
< initial load of destruction >
As a means for measuring the load at break, a nano scratch tester manufactured by CSM Instruments SA was used. The 1 st surface or the 2 nd surface of each retardation film (sample) was attached to a slide glass with the other surface (the 2 nd surface or the 1 st surface) facing upward, and fixed to the stage of the measurement apparatus. Then, in a measuring environment of 23 ℃ and 50% RH, a scratch test was performed by rubbing in one direction while increasing the load (scratch load) to 0 to 300mN in the continuous load mode of the above apparatus using a cantilever ST-150 having a conical diamond indenter (radius of curvature of the tip is 10 μm).
The scratch mark of the sample subjected to the scratch test was observed on the surface of the sample at a magnification of 20 times with an optical microscope (manufactured by nikon corporation) attached to the apparatus. Then, the initial position where the back layer peeled off longer than 2 μm in the scratch direction on the scratch trace was set as a failure starting point, and the scratch load corresponding to the center of the length (failure length) of the failure starting point along the scratch direction was set as a failure starting load. Fig. 2 is an image showing a scratch mark before the start of destruction (non-destruction portion), and fig. 3 is an image showing a scratch mark at the start point of destruction.
The results of measuring the above samples are shown in table 1, in which the first surface having a large fracture initiation load is referred to as the 1 st surface and the second surface having a small fracture initiation load is referred to as the 2 nd surface.
(production of polarizing mirror)
A polyvinyl alcohol film having a polymerization degree of 2400, a saponification degree of 99.9 mol% and a thickness of 30 μm was immersed in warm water at 30 ℃ and uniaxially stretched while swelling the film so that the length of the polyvinyl alcohol film was 2.0 times the original length. Next, the film was immersed in an aqueous solution (dyeing bath) of a mixture of iodine and potassium iodide (weight ratio 0.5: 8) having a concentration of 0.3 wt%, and was dyed while uniaxially stretching the polyvinyl alcohol film so that the length of the film became 3.0 times the original length. Then, the polyvinyl alcohol film was stretched so that the length thereof became 3.7 times the original length while being immersed in an aqueous solution (crosslinking bath 1) containing 5 wt% of boric acid and 3 wt% of potassium iodide, and then stretched so that the length thereof became 6 times the original length in an aqueous solution (crosslinking bath 2) containing 4 wt% of boric acid and 5 wt% of potassium iodide at 60 ℃. Then, the resulting solution was immersed in an aqueous solution (iodine immersion bath) containing 3 wt% of potassium iodide to obtain an iodine ion immersion solution, and the resultant solution was dried in an oven at 60 ℃ for 4 minutes to obtain a long (rolled) polarizer. The thickness of the polarizer obtained was 12 μm. The absorption axis of the polarizer is parallel to the length direction.
(retardation film)
A film obtained by obliquely stretching a long cellulose Triacetate (TAC) film obtained by a solution casting method was used. The thicknesses of the stretched films (stretched products of the TAC films) were 35 μm, 32 μm, 28 μm, 25 μm, 20 μm and 40 μm, respectively.
For each stretched film (stretched material of TAC film), a hard coat layer having a thickness of 5 μm was provided on the 1 st surface or the 2 nd surface (surface not bonded to the polarizer).
Each stretched film (a stretched product of a TAC film) was adjusted to have an in-plane retardation Re (550) of 105nm, and the angle formed between the slow axis and the longitudinal direction was 45 °.
(protective layer: protective film)
A long Cycloolefin (COP) film (thickness: 13 μm, trade name: ZF14-013, manufactured by Nippon Ralskikai Co., Ltd.) was used.
(preparation of aqueous adhesive)
An acetoacetyl group-containing polyvinyl alcohol resin (average degree of polymerization: 1200, degree of saponification: 98.5 mol%, degree of acetoacetylation: 5 mol%) was dissolved in pure water at a temperature of 30 ℃ to adjust the solid content concentration to 4% to obtain an aqueous adhesive.
Example 1
(preparation of circular polarizing film)
As the retardation film, a retardation film having a hard coat layer provided on the 2 nd surface of a stretched film (stretched material of TAC film) having a thickness of 35 μm was used. The aqueous adhesive was applied to the 1 st surface of the retardation film so that the thickness of the adhesive layer after drying was 80 nm. The aqueous adhesive was similarly applied to the protective film so that the thickness of the adhesive layer after drying was 80 nm. Then, a retardation film with the above adhesive and a protective film were bonded to both surfaces of a polarizer by a roll coater at a temperature of 23 ℃, and then dried at 55 ℃ for 4 minutes and 86 ℃ for 4 minutes to prepare a circular polarizing film. The polarizer, the retardation film with an adhesive, and the protective film are bonded to each other so that the polarizer is in contact with the adhesive layer of the protective film. The absorption axis direction of the polarizer of the obtained circular polarizing film was parallel to the longitudinal direction, and the angle formed between the slow axis of the retardation film and the longitudinal direction was 45 °.
Examples 2 to 5 and comparative examples 1 to 7
A circular polarizing film was obtained in the same manner as in example 1, except that in example 1, the thickness of the stretched film used for the retardation film and the surface to which the retardation film was bonded to the polarizer were changed as shown in table 1.
The retardation films having the same thickness used in examples 1 to 5 and comparative examples 1 to 5 were the same retardation film, and were different only in the surface to be bonded to the polarizer. The retardation films having the same thickness used in comparative example 6 and comparative example 7 were the same retardation film, and only the surfaces to be bonded to the polarizers were different.
The circular polarizing films obtained in the above examples and comparative examples were evaluated as follows, and are shown in table 1.
< method for measuring peeling force >
The obtained circularly polarizing film was measured for peel force by the following method.
The circularly polarizing film was cut out to a size of 200mm in parallel with the stretching direction of the polarizer and 15mm in the orthogonal direction, and a cut was made between the retardation film and the polarizer with a cutter, and the retardation film side of the circularly polarizing film was bonded to a glass plate. The protective film and the polarizer were peeled off at a peeling speed of 3000mm/min in a direction of 90 degrees by a universal tensile machine, and the peel strength (N/15mm) was measured. The infrared absorption spectrum of the peeled surface after peeling was measured by ATR method, and the aggregation breakdown (film breakage) of the retardation film was confirmed.
The peel force is preferably 0.8N/15mm or more, more preferably 1N/15mm or more, and still more preferably 1.5N/15mm or more. In Table 1, the case where the peeling force was 0.8N/15mm or more was "O", and the case where the peeling force was less than 0.8N/15 was "X".
When the initial breaking load of the surface of the polarizer to which the retardation film is bonded is 55mN or more, the peeling force from the polarizer can satisfy 0.8N/15 mm.
Length in curling direction
The obtained circular polarizing film was cut to have a size of 112mm × 65mm (5 inch size) so that the absorption axis direction of the polarizer was a long side. The cut circular polarizing film was left standing on a horizontal plane so that the hard coat layer was oriented upward, and the height of the end of the sample curled and lifted from the above plane was measured. The height of the portion where the lift-off is largest (the maximum lift-off height) is 3mm or less is defined as ∘, and the maximum lift-off height exceeds 3mm is defined as ×.
[ Table 1]
Claims (10)
1. A circular polarizing film comprising a polarizer, a retardation film disposed on one side of the polarizer, and a protective layer disposed on the other side of the polarizer,
the phase difference film has a function of converting linearly polarized light into circularly polarized light or elliptically polarized light, has a thickness of 35 μm or less, and,
The two surfaces of the retardation film have different initial loads of destruction in a scratch test, and the polarizer is bonded to the 1 st surface of the retardation film when the 1 st surface is set on the side having a high initial load of destruction and the 2 nd surface is set on the side having a low initial load of destruction.
2. The circular polarizing film according to claim 1, wherein a fracture initiation load of the 1 st surface of the phase difference film is 55mN or more.
3. The circular polarizing film according to claim 1, wherein a surface functional layer is provided on the 2 nd surface of the phase difference film.
4. The circular polarizing film according to claim 1, wherein an angle formed by an absorption axis of the polarizer and a slow axis of the phase difference film is 35 ° to 55 °.
5. The circular polarizing film according to claim 1, which is in a long form, and an angle formed by a slow axis of the retardation film and a longitudinal direction is 35 ° to 55 °.
6. The circular polarizing film according to claim 1, wherein the retardation film is a stretched product of a resin film obtained by molding on a cast body by a solution casting method, and a cast body-side surface of the resin film is the 1 st surface.
7. The circular polarizing film according to claim 1, wherein the phase difference film is a cellulose ester film.
8. The circular polarizing film according to any one of claims 1 to 7, wherein the polarizer, the phase difference film and the protective layer are bonded together by an adhesive layer.
9. A circular polarizing film with an adhesive layer, comprising the circular polarizing film according to any one of claims 1 to 8, and an adhesive layer.
10. An image display device comprising the circular polarizing film according to any one of claims 1 to 8 or the adhesive layer-attached circular polarizing film according to claim 9 on a viewing side of an optical unit, wherein the phase difference film is disposed on the viewing side of the polarizer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2017-097215 | 2017-05-16 | ||
| JP2017097215A JP6935229B2 (en) | 2017-05-16 | 2017-05-16 | Circularly polarizing film, circularly polarizing film with adhesive layer and image display device |
| PCT/JP2018/018445 WO2018212112A1 (en) | 2017-05-16 | 2018-05-14 | Circularly polarizing film, circularly polarizing film with adhesive layer, and image display device |
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| CN110651205A CN110651205A (en) | 2020-01-03 |
| CN110651205B true CN110651205B (en) | 2022-01-18 |
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| CN201880031905.1A Active CN110651205B (en) | 2017-05-16 | 2018-05-14 | Circular polarizing film, circular polarizing film with adhesive layer, and image display device |
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| Country | Link |
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| JP (1) | JP6935229B2 (en) |
| KR (1) | KR102281483B1 (en) |
| CN (1) | CN110651205B (en) |
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Family Cites Families (42)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001100044A (en) * | 1999-09-30 | 2001-04-13 | Fuji Photo Film Co Ltd | Polarizing plate |
| CN100500746C (en) * | 2001-05-30 | 2009-06-17 | 柯尼卡美能达精密光学株式会社 | Cellulose ester film, its manufacturing method, phase displacement film, optical compensation sheet, elliptic polarizing plate, and display |
| US7223451B2 (en) * | 2002-06-27 | 2007-05-29 | Teijin Limited | Polycarbonate-based oriented film and retardation film |
| JP2004177642A (en) * | 2002-11-27 | 2004-06-24 | Konica Minolta Holdings Inc | Phase difference film and its manufacturing method, optical compensating film, polarizing plate, and liquid crystal display device |
| US7504139B2 (en) * | 2003-12-26 | 2009-03-17 | Fujifilm Corporation | Optical cellulose acylate film, polarizing plate and liquid crystal display |
| JP4335773B2 (en) * | 2004-09-27 | 2009-09-30 | 日東電工株式会社 | Film laminate manufacturing method and manufacturing apparatus used therefor |
| CN100380206C (en) * | 2004-12-02 | 2008-04-09 | 日东电工株式会社 | Polarizing plate with optical compensating layer, and image display using the same |
| JP4853056B2 (en) * | 2006-03-08 | 2012-01-11 | 大日本印刷株式会社 | Authenticity determination medium and article having the same, authenticity determination medium label, authenticity determination medium transfer sheet, and authenticity determination medium transfer foil |
| WO2007141899A1 (en) * | 2006-06-05 | 2007-12-13 | Teijin Chemicals Ltd. | Polycarbonate resin film and method for production thereof |
| EP2048525A4 (en) * | 2006-07-31 | 2010-11-10 | Konica Minolta Opto Inc | Process for producing optical film, optical film, and polarization plate or image display unit utilizing the same |
| US20100003426A1 (en) * | 2006-08-04 | 2010-01-07 | Takatugu Suzuki | Optical Film, Manufacturing Method Thereof, Polarizing Plate Employing it and Liquid Crystal Display Device |
| WO2008068961A1 (en) * | 2006-12-05 | 2008-06-12 | Konica Minolta Opto, Inc. | Optical film and polarizer and liquid-crystal display each employing the same |
| JP2009067875A (en) * | 2007-09-12 | 2009-04-02 | Fujifilm Corp | Cellulose acylate film, method for manufacturing the same, retardation film, polarizing plate and liquid crystal display |
| JP5104373B2 (en) * | 2008-02-14 | 2012-12-19 | 日本ゼオン株式会社 | Production method of retardation plate |
| JPWO2010001763A1 (en) * | 2008-07-01 | 2011-12-22 | 日本ゼオン株式会社 | Optical member and grid polarizing film |
| JP5406615B2 (en) * | 2009-07-15 | 2014-02-05 | 日東電工株式会社 | Transparent film and surface protective film using the film |
| JP2012003183A (en) * | 2010-06-21 | 2012-01-05 | Fujifilm Corp | Twisted alignment mode liquid crystal display device |
| WO2012026497A1 (en) * | 2010-08-27 | 2012-03-01 | 大日本印刷株式会社 | Optical laminate, polarization plate, and image display device |
| JP4691205B1 (en) * | 2010-09-03 | 2011-06-01 | 日東電工株式会社 | Method for producing optical film laminate including thin high-performance polarizing film |
| US8922889B2 (en) * | 2011-11-14 | 2014-12-30 | Fujifilm Corporation | Cellulose acylate film, protective film for polarizing plate, polarizing plate, and liquid crystal display device |
| JP5928482B2 (en) * | 2011-12-28 | 2016-06-01 | コニカミノルタ株式会社 | Retardation film, method for producing retardation film, polarizing plate and liquid crystal display device |
| WO2013125211A1 (en) * | 2012-02-22 | 2013-08-29 | コニカミノルタ株式会社 | Optical film, circularly polarizing plate, and image display device |
| JP6335422B2 (en) * | 2012-06-29 | 2018-05-30 | 日東電工株式会社 | Circular polarizing plate and organic EL panel |
| JP6167479B2 (en) | 2012-07-06 | 2017-07-26 | 大日本印刷株式会社 | Polarizing plate, organic electroluminescence display device, and liquid crystal display device |
| JP5891165B2 (en) * | 2012-07-20 | 2016-03-22 | 富士フイルム株式会社 | Laminated body, polarizing plate, and liquid crystal display device |
| JPWO2014061215A1 (en) * | 2012-10-15 | 2016-09-05 | コニカミノルタ株式会社 | Retardation film, circularly polarizing plate produced using the retardation film, and organic EL display |
| US20140111859A1 (en) * | 2012-10-19 | 2014-04-24 | Corning Incorporated | Scratch resistant polarizing articles and methods for making and using same |
| CN104076426B (en) * | 2013-03-27 | 2017-08-15 | 日东电工株式会社 | The manufacture method of polarization plates, liquid crystal display device and polarization plates |
| RU2669544C2 (en) * | 2013-05-29 | 2018-10-11 | Волфони Р Энд Д | Device of optical polarization for the stereoscopic image projector |
| JP5994746B2 (en) * | 2013-05-31 | 2016-09-21 | コニカミノルタ株式会社 | Liquid crystal display device with hard coat film, polarizing plate and touch panel |
| JP5971198B2 (en) * | 2013-06-12 | 2016-08-17 | コニカミノルタ株式会社 | Polarizing plate, method for manufacturing the same, and organic electroluminescence display device including the same |
| CN104513400B (en) * | 2013-09-27 | 2018-11-06 | 富士胶片株式会社 | Solution film-forming method and equipment |
| KR20160124867A (en) * | 2014-03-25 | 2016-10-28 | 코니카 미놀타 가부시키가이샤 | Retardation film, polarizing plate using same, and display device |
| JP6254891B2 (en) * | 2014-04-07 | 2017-12-27 | 日東電工株式会社 | Manufacturing method of polarizing plate |
| KR20170012322A (en) * | 2014-05-23 | 2017-02-02 | 스미또모 가가꾸 가부시키가이샤 | Optical laminate and image display device |
| US20160033699A1 (en) * | 2014-08-04 | 2016-02-04 | Nitto Denko Corporation | Polarizing plate |
| CN104596989B (en) * | 2015-01-23 | 2017-05-31 | 四川大学 | Method based on interference fringe picture treatment measurement refractive index of transparent medium distribution |
| JP6732407B2 (en) * | 2015-03-20 | 2020-07-29 | 日東電工株式会社 | Optical laminate, method for manufacturing the same, and image display device using the optical laminate |
| JP2016200709A (en) * | 2015-04-10 | 2016-12-01 | コニカミノルタ株式会社 | Polarizing plate protective film and polarizing plate having the same, and method for producing the polarizing plate protective film |
| JP6784481B2 (en) * | 2015-07-13 | 2020-11-11 | 日東電工株式会社 | Circular polarizing plate for organic EL display device and organic EL display device |
| KR20170011306A (en) * | 2015-07-22 | 2017-02-02 | 삼성전자주식회사 | Optical film, manufacturing method thereof and display device |
| US10107946B2 (en) * | 2015-07-22 | 2018-10-23 | Nitto Denko Corporation | Polarizing plate with a retardation layer and image display apparatus |
-
2017
- 2017-05-16 JP JP2017097215A patent/JP6935229B2/en active Active
-
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- 2018-05-14 CN CN201880031905.1A patent/CN110651205B/en active Active
- 2018-05-14 KR KR1020197030387A patent/KR102281483B1/en active IP Right Grant
- 2018-05-14 WO PCT/JP2018/018445 patent/WO2018212112A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| WO2018212112A1 (en) | 2018-11-22 |
| CN110651205A (en) | 2020-01-03 |
| TWI657919B (en) | 2019-05-01 |
| JP2018194644A (en) | 2018-12-06 |
| KR102281483B1 (en) | 2021-07-26 |
| KR20190121401A (en) | 2019-10-25 |
| TW201900416A (en) | 2019-01-01 |
| JP6935229B2 (en) | 2021-09-15 |
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