CN112840239A - Transfer film, polarizing plate, image display device, and method for manufacturing polarizing plate - Google Patents
Transfer film, polarizing plate, image display device, and method for manufacturing polarizing plate Download PDFInfo
- Publication number
- CN112840239A CN112840239A CN201980063133.4A CN201980063133A CN112840239A CN 112840239 A CN112840239 A CN 112840239A CN 201980063133 A CN201980063133 A CN 201980063133A CN 112840239 A CN112840239 A CN 112840239A
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- film
- temporary support
- retardation
- transfer film
- liquid crystal
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Images
Classifications
-
- 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
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- 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
-
- 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
-
- 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
-
- 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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
-
- 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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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a transfer film which has excellent processing adaptability and good phase difference film transfer performance, a polarizing plate, an image display device and a manufacturing method of the polarizing plate. The transfer film of the present invention comprises a temporary support and a retardation film provided on the temporary support so as to be peelable, wherein the retardation film comprises a retardation layer disposed on the temporary support directly or via an alignment film, the retardation layer is a layer obtained by polymerizing a composition containing a liquid crystalline compound having a polymerizable group, and when the retardation layer is disposed directly on the temporary support, the retardation layer satisfies both requirements 1 and 2, and when the retardation layer is disposed on the temporary support via the alignment film, the alignment film satisfies both requirements 1 and 2. Requirement 1: a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having 3 or more functions; requirement 2: a layer having a breaking peel load of 0.4N/25mm or more.
Description
Technical Field
The present invention relates to a transfer film, a polarizing plate, an image display device, and a method for manufacturing a polarizing plate.
Background
The retardation film is generally used as a viewing angle compensation film for a liquid crystal display device or an antireflection film for an organic electroluminescence (hereinafter, abbreviated as "EL") display device.
In recent years, with the spread of display devices, there has been a demand for thinner retardation films and more efficient manufacturing processes for use in display devices.
In order to meet such a demand, patent document 1 describes "a transfer film including a releasable support and an optical film releasably laminated on the releasable support, wherein the optical film includes an optically anisotropic layer containing a liquid crystal compound and a non-thermoplastic acrylic resin layer adjacent to the optically anisotropic layer, the acrylic resin in the non-thermoplastic acrylic resin layer has a polyoxyalkylene chain, the content of the polyoxyalkylene chain is 8 to 60% by mass based on the total mass of the non-thermoplastic acrylic resin layers, the thickness of the non-thermoplastic acrylic resin layer is 5 to 25 μm, the thickness of the optically anisotropic layer is 0.1 to 10 μm, and the thickness of the non-thermoplastic acrylic resin layer is thicker than the thickness of the optically anisotropic layer. "([ claim 1 ]).
Prior art documents
Patent document
Patent document 1: international publication No. 2014/178395
Disclosure of Invention
Technical problem to be solved by the invention
As a result of studies of patent document 1, the present inventors have found that a temporary support (releasable support) is easily peeled off and a retardation film (optical film) is transferred, but there is a problem that the retardation film is peeled off from the temporary support when the transfer film itself is processed (for example, laminated on another film) in a stage before the transfer of the retardation film.
Accordingly, an object of the present invention is to provide a transfer film and a polarizing plate having excellent processability and excellent transferability of a retardation film, an image display device, and a method for producing a polarizing plate.
Means for solving the technical problem
As a result of intensive studies to solve the above problems, the present inventors have found that a transfer film having a temporary support and a retardation film, which has excellent processability and excellent transferability of the retardation film, can be obtained when the retardation layer or the alignment film adjacent to the temporary support is a layer satisfying predetermined requirements, and have completed the present invention.
That is, it has been found that the above-mentioned problems can be achieved by the following configuration.
[1] A transfer film comprising a temporary support and a retardation film provided on the temporary support so as to be peelable therefrom, wherein the retardation film comprises a retardation layer disposed on the temporary support directly or via an alignment film, the retardation layer being obtained by polymerizing a composition containing a liquid crystalline compound having a polymerizable group,
when the retardation layer is disposed directly on the temporary support, the retardation layer satisfies both requirement 1 and requirement 2,
when the retardation layer is disposed on the temporary support via the alignment film, the alignment film satisfies both requirement 1 and requirement 2.
Requirement 1: a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having 3 or more functional groups
Requirement 2: layer having a breaking peel load of 0.4N/25mm or more
[2] The transfer film according to [1], wherein the molecular weight of the non-liquid crystal compound to 1 polymerizable group is 150 or less.
[3] The transfer film according to [1] or [2], wherein the non-liquid crystal compound has a urethane bond in a molecule.
[4] The transfer film according to any one of [1] to [3], wherein a peel strength between the temporary support and the retardation film is 0.05 to 0.60N/25 mm.
[5] The transfer film according to any one of [1] to [4], wherein the retardation layer is disposed directly on the temporary support, and the retardation layer is a layer obtained by polymerizing a composition containing a liquid crystalline compound having a polymerizable group and a non-liquid crystalline compound having a polymerizable group having 3 or more functions.
[6] The transfer film according to [5], wherein the content of the non-liquid crystal compound is 6 parts by mass or more per 100 parts by mass of the liquid crystal compound.
[7] The transfer film according to [5], wherein the content of the non-liquid crystal compound is more than 10 parts by mass and less than 30 parts by mass with respect to 100 parts by mass of the liquid crystal compound.
[8] The transfer film according to any one of [5] to [7], wherein the retardation layer has a structure in which a liquid crystalline compound and a non-liquid crystalline compound are copolymerized.
[9] The transfer film according to any one of [5] to [8], wherein the retardation layer satisfies the following requirement 3.
Requirement 3: the concentration of the liquid crystalline compound at the interface between the retardation layer and the temporary support is 50% or less relative to the concentration of the liquid crystalline compound in the central portion of the retardation layer in the film thickness direction
[10] The transfer film according to any one of [1] to [4], wherein the retardation layer is disposed on the temporary support via an alignment film, and the alignment film satisfies the following requirement 4.
Requirement 4: a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having 3 or more functions in an amount of 80% by mass or more based on the total mass of the solid content of the non-liquid crystal compound
[11] The transfer film according to any one of [1] to [10], further comprising another film, wherein the other film is bonded to a surface of the retardation film on a side opposite to the temporary support via an adhesive or a bonding agent.
[12] A polarizing plate comprising a retardation film obtained by peeling a temporary support from the transfer film according to any one of [1] to [10], and a polarizer, wherein the polarizer is bonded to the surface of the retardation film via an adhesive or a pressure-sensitive adhesive.
[13] A polarizing plate comprising a laminate of a retardation film obtained by peeling a temporary support from the transfer film of [11] and another film, and a polarizer, wherein the polarizer is bonded to the surface of the other film via an adhesive or a bonding agent.
[14] An image display device having the polarizing plate of [12] or [13 ].
[15] A method for producing a polarizing plate according to [12], the method comprising: a bonding step of bonding a polarizer to a surface of the retardation film of the transfer film according to any one of [1] to [10] on the side opposite to the temporary support via an adhesive or a bonding agent; and a peeling step of peeling the temporary support after the bonding step to produce a polarizing plate.
[16] A method for producing a polarizing plate according to [13], the method comprising: a bonding step of bonding a polarizer to the surface of the other film of the transfer film according to [11] on the side opposite to the retardation film via an adhesive or a bonding agent; and a peeling step of peeling the temporary support body of the transfer film after the bonding step to manufacture the polarizing plate.
Effects of the invention
According to the present invention, it is possible to provide a transfer film and a polarizing plate having excellent processability and excellent transferability of a retardation film, an image display device, and a method for manufacturing a polarizing plate.
Drawings
Fig. 1A is a schematic cross-sectional view showing an example of an embodiment of the transfer film of the present invention.
Fig. 1B is a schematic cross-sectional view showing an example of the transfer film according to the embodiment of the present invention.
Fig. 1C is a schematic cross-sectional view showing an example of the transfer film according to the embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view showing an example of the transfer film according to the embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view showing an example of the embodiment of the polarizing plate of the present invention.
Fig. 4 is a schematic cross-sectional view showing an example of the embodiment of the polarizing plate of the present invention.
Fig. 5 is a schematic cross-sectional view illustrating a method of measuring a fracture peeling load.
Detailed Description
The present invention will be described in detail below.
The following description of the constituent requirements is made in accordance with the exemplary embodiments of the present invention, but the present invention is not limited to such embodiments.
In the present specification, the numerical range represented by "to" means a range including numerical values before and after "to" as a lower limit value and an upper limit value.
In the present specification, the terms parallel and orthogonal do not mean parallel and orthogonal in a strict sense, but mean a range of ± 5 ° from parallel or orthogonal, respectively.
In the present specification, one kind of substance corresponding to each component may be used alone or 2 or more kinds may be used in combination for each component. In the case where 2 or more substances are used simultaneously as each component, the content of the components thereof means the total content of the substances used simultaneously unless otherwise specified.
In the present specification, "(meth) acrylate" is a label indicating any one of acrylate and methacrylate, "(meth) acrylic acid" is a label indicating any one of acrylic acid and methacrylic acid, and "(meth) acryloyl group" is a label indicating any one of acryloyl group and methacryloyl group.
[ transfer film ]
The transfer film of the present invention is a transfer film having a temporary support and a retardation film that is provided on the temporary support so as to be peelable.
In the transfer film of the present invention, the retardation film includes a retardation layer disposed on the temporary support directly or via an alignment film, and the retardation layer is obtained by polymerizing a composition containing a liquid crystalline compound having a polymerizable group.
In the transfer film of the present invention, when the retardation layer is disposed directly on the temporary support, that is, when the temporary support and the retardation layer are adjacent to each other, the retardation layer satisfies both requirements 1 and 2, and when the retardation layer is disposed on the temporary support via the alignment film, that is, when the temporary support and the alignment film are adjacent to each other, the alignment film satisfies both requirements 1 and 2. In the present invention, when the retardation layer is disposed on the temporary support via the alignment film, the alignment film is included in the retardation film together with the retardation layer.
Requirement 1: a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having 3 or more functional groups
Requirement 2: layer having a breaking peel load of 0.4N/25mm or more
In the present invention, as described above, in the transfer film including the temporary support and the retardation film, a retardation layer adjacent to the temporary support (an alignment film in the case where the retardation film includes an alignment film) (hereinafter, also simply referred to as "adjacent layer"). And requirement 1 and requirement 2 are satisfied at the same time, the transfer film has excellent processability and also has good transferability of the retardation film.
The details of which are not clear, but the present inventors presume as follows.
First, the present inventors have studied the cause of the poor processability, and as a result, it is considered that the cause is that if the transfer film is processed in the stage before the transfer of the retardation film, the transfer film is scratched in a carrying step or the like, and the transfer film is unexpectedly peeled off when the scratch is caused.
Therefore, in the present invention, it is considered that, by providing an adjacent layer adjacent to the temporary support as a layer satisfying both requirement 1 and requirement 2, the occurrence of scratches, i.e., breakage, which is a cause of peeling is suppressed, and the processing suitability before intentional peeling (transfer) is improved.
Fig. 1A to 1C show an example of an embodiment of the transfer film of the present invention.
The transfer film 10 shown in fig. 1A includes a temporary support 1 and a retardation film 2 including a retardation layer not shown.
The transfer film 10a shown in fig. 1B includes a temporary support 1 and a retardation layer 2a as a retardation film 2.
The transfer film 10b shown in fig. 1C includes a temporary support 1, and an alignment film 2b and a retardation layer 2a as the retardation film 2.
[ Condition 1] for safety
In the transfer film of the present invention, the adjacent layer adjacent to the temporary support is a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having a 3-or more functional group.
Specific examples of the polymerizable group include a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group, and among them, a (meth) acryloyl group is preferable.
Examples of the non-liquid crystal compound having 3 or more polymerizable groups include polyfunctional monomers having 3 or more polymerizable groups, and specifically include esters of polyols having 3 or more hydroxyl groups and (meth) acrylic acid and urethane (meth) acrylates.
Specific examples of the esters include pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, EO (ethylene oxide) -modified trimethylolpropane tri (meth) acrylate, PO (propylene oxide) -modified trimethylolpropane tri (meth) acrylate, EO-modified phosphoric acid tri (meth) acrylate, trimethylolethane tri (meth) acrylate, bis-trimethylolpropane tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, pentaerythritol hexa (meth) acrylate, caprolactone-modified dipentaerythritol hexa (meth) acrylate, 1, 2, 3-cyclohexane tetramethylacrylate, pentaerythritol tri (meth) acrylate, and mixtures thereof, Polyurethane polyacrylate, polyester polyacrylate, caprolactone modified tri (acryloyloxyethyl) isocyanurate and the like.
As the above esters, commercially available ones can be used, and specific examples thereof include A-DPH (dipentaerythritol hexaacrylate) and A-TMMT (pentaerythritol tetraacrylate) (SHIN-NAKAMURA CHEMICAL CO, manufactured by LTD.); SP327 (manufactured by OSAKA ORGANIC CHEMICAL INDUSTRY LTD.); and the like.
On the other hand, specific examples of the urethane (meth) acrylates include compounds obtained by an addition reaction using a polyisocyanate compound and a hydroxyl group-containing (meth) acrylate compound; a compound obtained by an addition reaction using a polyol compound and a (meth) acrylate compound containing an isocyanate group; and the like.
Specific examples of the polyisocyanate compound include tolylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, tolylene diisocyanate, and 1, 3-bis (isocyanotomethyl) cyclohexane.
Specific examples of the hydroxyl group-containing (meth) acrylate compound include pentaerythritol triacrylate, dipentaerythritol pentaacrylate, 2-hydroxyethyl acrylate, and 2-hydroxyethyl methacrylate.
Specific examples of the polyol compound include ethylene glycol, propylene glycol, glycerin, pentaerythritol, dipentaerythritol, trimethylolethane, trimethylolpropane, and the like.
Specific examples of the (meth) acrylate compound having an isocyanate group include 2-isocyanatoethyl acrylate and 2-isocyanatoethyl methacrylate.
As the urethane (meth) acrylate compound, commercially available products can be used, and specific examples thereof include Negami Chemical Industrial Co,. Ltd ART RESIN UN-3320HA, ART RESIN UN-3320HC, ART RESIN UN-3320HS, ART RESIN UN-904, Nippon Synthetic Chemical Industry Co., Ltd. UV-1700B, UK UV-7605B, UK UV-7610B, UK UV-7630B, UK UV-7640B, Shin-Nakamura Chemical Co., Ltd. NK OLIGO U-6PA, NK OLIGO U-10HA, NK OLIGO U-10PA, NK OLIGO U-1100H, NK OLIGO U-15HA, KRNK OLIGO U-53H, NK OLIGO U-33 HA, NK OLIGO U-33H, DAICEL L (hereinafter LTRX 12952, LTRX 8452, abbreviated as "EB 1290". ) KRM8200, EBECRYL5129, KRM8904, Nippon Kayaku Co., UX-5000 manufactured by Ltd.
In the present invention, the molecular weight of the non-liquid crystal compound with respect to 1 polymerizable group is preferably 150 or less.
The "molecular weight per 1 polymerizable group" refers to the acrylic acid equivalent in the case where the polymerizable group is a (meth) acryloyl group.
In the present invention, the non-liquid crystal compound preferably has a urethane bond in the molecule, and more preferably the urethane (meth) acrylates.
[ Condition for requirements 2]
In the transfer film of the present invention, the adjacent layer adjacent to the temporary support is a layer having a breaking peel load of 0.4N/25mm or more.
In the present specification, the breaking peel load means a load (unit: N/25mm) measured in the following order.
As shown in FIG. 5, the transfer film 10 having the temporary support 1 and the retardation film 2 was corona-treated beforehand (output: 15 W.min/m) using a roll laminator (bonding speed: 150rpm/min, bonding pressure: 0.4MPa)2Carrying speed: 10m/min) was laminated via an Ultraviolet (UV) -curable resin composition 7 prepared with the following composition.
Subsequently, ultraviolet irradiation (150 mJ/cm) was carried out at room temperature (23 ℃ C.)2) The UV curable resin composition 7 was cured to prepare a bonded film.
Next, the produced bonding film was cut to a width of 25mm, and bonded to the glass substrate 6 via an adhesive (SK1478, manufactured by Soken Chemical & Engineering co., ltd.) 5.
Next, when the TAC substrate 8 was pulled up at 10mm/min in the direction of 90 ° indicated by an arrow in fig. 5, the value of the load applied when the adjacent layer adjacent to the temporary support 1 was broken or peeled while being broken was measured using a Tensilon universal material tester (manufactured by Orientec corporation), and this was defined as the breaking peel load.
CEL2021P
[ chemical formula 1]
CPI-100P
[ chemical formula 2]
In the present invention, the adjacent layer adjacent to the temporary support is preferably a layer having a breaking peel load of 0.4 to 1.5N/25 mm.
[ temporary support ]
The temporary support provided in the transfer film of the present invention functions as a support when the retardation layer or the alignment film is formed, and after the transfer film of the present invention is transferred (bonded) to a polarizer or the like, the temporary support is peeled and removed.
The temporary support may be transparent or opaque, and the material thereof is not particularly limited.
The temporary support may be a polymer film made of a polymer, and examples of the polymer constituting the polymer film include cellulose-based polymers such as triacetyl cellulose (TAC), cellulose acetate butyrate, and cellulose acetate propionate; acrylic polymers having acrylate polymers such as polymethyl methacrylate and polymers containing a lactone ring; a thermoplastic norbornene-based polymer; a polycarbonate-series polymer; polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; styrene polymers such AS polystyrene and acrylonitrile-styrene copolymer (AS resin); polyolefin polymers such as polyethylene, polypropylene, and ethylene-propylene copolymers; vinyl chloride-based polymers; amide polymers such as nylon and aromatic polyamide; an imide polymer; sulfone polymers; polyether sulfone polymers; polyether ether ketone polymers; polyphenylene sulfide-based polymers; vinylidene chloride-based polymers; a vinyl alcohol polymer; vinyl butyral polymers; an aromatic ester polymer; polyoxymethylene polymers; an epoxy-based polymer; or a polymer in which these polymers are mixed.
Among them, from the viewpoint of excellent peelability, a cellulose-based polymer or a polyester-based polymer is preferable.
The thickness of the temporary support is not particularly limited, but is preferably 10 to 150 μm, and more preferably 20 to 100 μm, from the viewpoint of excellent handling properties of the transfer film.
[ retardation film ]
The retardation film of the transfer film of the present invention includes a retardation layer disposed on the temporary support directly or via an alignment film.
< retardation layer >
The retardation layer is a layer obtained by polymerizing a composition containing a liquid crystalline compound having a polymerizable group (hereinafter, also referred to as a "liquid crystal composition of the present invention" in the form of a film).
(liquid Crystal Compound)
The liquid crystalline compound contained in the liquid crystal composition of the present invention is not particularly limited as long as it is a liquid crystalline compound having a polymerizable group, and conventionally known liquid crystalline compounds can be used.
Specific examples of the polymerizable group include a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group, and among them, a (meth) acryloyl group is preferable.
Generally, liquid crystalline compounds can be classified into rod-like types and disk-like types according to their shapes. And, respectively, have a low molecular type and a high molecular type. The polymer generally refers to a polymer having a polymerization degree of 100 or more (polymer physical/phase transition kinetics, Tujing, 2 p., Kyobo bookstore, 1992).
In the present invention, any liquid crystalline compound can be used, but a rod-like liquid crystalline compound or a discotic liquid crystalline compound (discotic liquid crystalline compound) is preferably used. It is possible to use 2 or more rod-like liquid crystalline compounds, 2 or more discotic liquid crystalline compounds, or a mixture of a rod-like liquid crystalline compound and a discotic liquid crystalline compound.
From the viewpoint of fixing the alignment, the liquid crystalline compound preferably has 2 or more polymerizable groups. When the liquid crystalline compound is a mixture of 2 or more species, at least one liquid crystalline compound preferably has 2 or more polymerizable groups in 1 molecule.
As the rod-like liquid crystalline compound, for example, the rod-like liquid crystalline compounds described in claims 1 of Japanese patent application laid-open No. 11-513019 and paragraphs [0026] to [0098] of Japanese patent application laid-open No. 2005-289980 can be preferably used, and as the discotic liquid crystalline compounds, for example, the discotic liquid crystalline compounds described in paragraphs [0020] to [0067] of Japanese patent application laid-open No. 2007-108732 and paragraphs [0013] to [0108] of Japanese patent application laid-open No. 2010-244038 can be preferably used, but not limited thereto.
In the present invention, the liquid crystalline compound is preferably a rod-like liquid crystalline compound, and examples thereof include azomethines, azoxyoxides, cyanobiphenyls, cyanobenzene esters, benzoates, cyclohexanecarboxylates, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted phenylpyrimidines, phenyldioxanes, tolanes, and cyclohexenylbenzonitrile.
< onium salt Compound >
The liquid crystal composition of the present invention preferably contains an onium salt compound.
As the onium salt compound, an onium compound known as a vertical alignment agent can be used. Specifically, there are compounds described in paragraphs [0042] to [0052] of Japanese patent laid-open No. 2016-105127.
The content of the onium salt compound is preferably 0.5 to 5 parts by mass, more preferably 1 to 3 parts by mass, per 100 parts by mass of the liquid crystalline compound.
< polymerization initiator >
The liquid crystal composition of the present invention preferably contains a polymerization initiator.
The polymerization initiator used is preferably a photopolymerization initiator capable of initiating a polymerization reaction by ultraviolet irradiation.
Examples of the photopolymerization initiator include an α -carbonyl compound (described in U.S. Pat. Nos. 2367661 and 2367670), an acyloin ether (described in U.S. Pat. No. 2448828), an α -hydrocarbon-substituted aromatic acyloin compound (described in U.S. Pat. No. 2722512), a polynuclear quinone compound (described in U.S. Pat. Nos. 3046127 and 2951758), a combination of a triarylimidazole dimer and a p-aminophenyl ketone (described in U.S. Pat. No. 3549367), an acridine and phenazine compound (described in Japanese patent publication No. 60-105667 and U.S. Pat. No. 4239850), an oxadiazole compound (described in U.S. Pat. No. 4212970), an acylphosphine oxide compound (described in Japanese patent publication No. 63-040799, a naphthoquinone compound, a naphthoquinone, Japanese patent publication No. 5-029234, Japanese patent application laid-open No. 10-095788, and Japanese patent application laid-open No. 10-029997).
< surfactant >
The liquid crystal composition of the present invention may contain a surfactant from the viewpoint of uniformity of the coating film and strength of the retardation layer.
The surfactant includes conventionally known compounds, and particularly preferably a fluorine-based compound. Specifically, examples thereof include compounds described in paragraphs [0028] to [0056] in the specification of Japanese patent application laid-open No. 2001-330725, and compounds described in paragraphs [0069] to [0126] in the specification of Japanese patent application laid-open No. 2003-295212.
< solvent >
The liquid crystal composition of the present invention preferably contains a solvent from the viewpoint of workability for forming the retardation layer.
Specific examples of the solvent include ketones (e.g., acetone, 2-butanone, methyl isobutyl ketone, cyclohexanone, etc.), ethers (e.g., dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (e.g., hexane, etc.), alicyclic hydrocarbons (e.g., cyclohexane, etc.), aromatic hydrocarbons (e.g., toluene, xylene, trimethylbenzene, etc.), halogenated carbons (e.g., dichloromethane, dichloroethane, dichlorobenzene, chlorotoluene, etc.), esters (e.g., methyl acetate, ethyl acetate, butyl acetate, etc.), water, alcohols (e.g., ethanol, isopropanol, butanol, cyclohexanol, etc.), cellosolves (e.g., methyl cellosolve, ethyl cellosolve, etc.), cellosolve acetates, sulfoxides (e.g., dimethyl sulfoxide, etc.), amides (e.g., dimethylformamide, dimethylacetamide, etc.), these may be used alone or in combination of two or more.
In the present invention, the retardation layer is preferably disposed directly on the temporary support.
Therefore, the liquid crystal composition of the present invention is preferably a composition containing a liquid crystal compound having a polymerizable group and the non-liquid crystal compound having a polymerizable group having 3 or more functions.
In this case, the content of the non-liquid crystal compound having a polymerizable group having 3 or more functions is preferably 6 parts by mass or more, and more preferably more than 10 parts by mass and less than 30 parts by mass, based on 100 parts by mass of the liquid crystal compound having a polymerizable group.
The retardation layer preferably has a structure obtained by copolymerizing a liquid crystalline compound having a polymerizable group and the non-liquid crystalline compound having a polymerizable group having 3 or more functions.
When the retardation layer is directly disposed on the temporary support, the retardation layer preferably satisfies requirement 3 described below.
Requirement 3: the concentration of the liquid crystalline compound at the interface between the retardation layer and the temporary support is 50% or less relative to the concentration of the liquid crystalline compound in the central portion of the retardation layer in the film thickness direction
In the present specification, the concentration of the liquid crystalline compound in requirement 3 is a value calculated by the following method.
After the retardation layer was peeled off from the temporary support, the Secondary Ion intensity of the surface of the retardation layer facing the temporary support was measured by Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS), and then the surface of the measurement surface was etched by a sputtering gun to measure the Secondary Ion intensity of the etched surface.
Thereafter, the cycle of etching and measurement of the secondary ion intensity was repeated until the retardation layer disappeared, and a distribution (map) of the secondary ion intensity was prepared.
The secondary ion intensity of the surface of the retardation layer facing the temporary support is set to the concentration of the liquid crystalline compound at the interface between the retardation layer and the temporary support, and the secondary ion intensity at a position half the number of times of sputtering required until the retardation layer disappears is set to the concentration of the liquid crystalline compound in the central portion of the retardation layer in the film thickness direction.
Then, the ratio of the concentration of the liquid crystalline compound at the interface between the retardation layer and the temporary support to the concentration of the liquid crystalline compound in the center portion of the retardation layer in the film thickness direction was calculated.
For TOF-SIMS measurement, TRIFT V NanoTOF (product name) manufactured by ULVAC-PHI corporation was used, and a measurement range was 100mm in a high-quality resolution mode2And 5 times/cycle in total. Charge calibration was performed using a low-speed electron gun and Ar-GCIB (Ar2500+, 20kV, 2nA) at 500mm2And 5 s/cycle.
In the present invention, the concentration of the liquid crystalline compound at the interface between the retardation layer and the temporary support is more preferably 30% or less, still more preferably 20% or less, and particularly preferably 15% or less, with respect to the concentration of the liquid crystalline compound in the central portion of the retardation layer in the film thickness direction.
In the present invention, as a method for forming the retardation layer, for example, a method in which the liquid crystal composition of the present invention is applied to the temporary support or an alignment film described later, and a desired alignment state is set, followed by polymerization and fixation is given.
Examples of the method for applying the liquid crystal composition include a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die coating method.
And, the polymerization conditions are not specifiedIn addition, the polymerization by irradiation with light is preferably performed by using ultraviolet rays. The irradiation dose is preferably 10mJ/cm2～50J/cm2More preferably 20mJ/cm2～5J/cm2More preferably 30mJ/cm2～3J/cm2Particularly preferably 50 to 1000mJ/cm2. Further, the polymerization reaction may be carried out under heating to promote the polymerization reaction.
The thickness (film thickness) of the retardation layer is not particularly limited, but is preferably 0.1 to 10 μm, more preferably 0.5 to 5 μm.
< alignment film >
The alignment film is a layer which is optionally disposed on the temporary support, and in the present invention, the alignment film is a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having a 3-or more functional group.
Among them, as components other than the non-liquid crystal compound having a polymerizable group having 3 or more functions contained in the composition, there can be mentioned polymer materials known as a material for a general alignment film, and specifically, there can be mentioned polyvinyl alcohol, polyimide, derivatives thereof, and the like.
The polymerization initiator and the solvent described in the liquid crystal composition of the present invention can be used as components other than the non-liquid crystal compound having a polymerizable group having 3 or more functions contained in the composition.
Further, as a method for forming an alignment film, for example, a method in which the crystal composition is applied to the temporary support and fixed by polymerization, and the like can be cited.
Examples of the coating method of the composition include a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die coating method.
The thickness of the alignment film is not particularly limited, but is preferably 0.01 to 10 μm, more preferably 0.5 to 5 μm, and still more preferably 1.5 to 3 μm, from the viewpoint of forming a retardation layer having a uniform thickness by alleviating surface irregularities existing on the temporary support.
In the present invention, the alignment film preferably satisfies the following requirement 4.
Requirement 4: a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having 3 or more functions in an amount of 80% by mass or more based on the total mass of the solid content of the non-liquid crystal compound
The non-liquid crystal compound having a polymerizable group having 3 or more functions is more preferably 90% by mass or more, and still more preferably 95% by mass or more, based on the total mass of the solid components of the non-liquid crystal compound contained in the composition.
In the present invention, the peel strength between the temporary support and the retardation film is preferably 0.05 to 0.60N/25mm, more preferably 0.10 to 0.20N/25mm, from the viewpoint of better transferability.
In the present specification, the peel strength means a load value (unit: N/25mm) measured in the following order.
First, the transfer film was cut to 150mm × 25mm, and then the surface of the retardation film opposite to the temporary support was bonded to the glass substrate with an adhesive (SK1478, manufactured by Soken Chemical & Engineering co., ltd). At this time, only the 80mm × 25mm portion was bonded to the glass substrate.
Next, the portion of the transfer film not bonded to the glass substrate and the glass substrate were held, and the load value at the time of peeling the temporary support by applying a force in the direction of 180 ° to these portions was measured using a Tensilon universal material tester (manufactured by Orientec corporation).
[ other films ]
In the transfer film of the present invention, another film may be bonded to the surface of the retardation film on the side opposite to the temporary support via an adhesive or a bonding agent.
Fig. 2 shows an example of an embodiment of the transfer film of the present invention having another film.
The transfer film 20 shown in fig. 2 includes a temporary support 1, a retardation film 2, and other thin films 3.
The other film is not particularly limited, and examples thereof include a polymer film exemplified as the temporary support, a film in which a liquid crystalline compound is horizontally aligned, and the like, and one kind thereof may be used alone, or two or more kinds thereof may be used (laminated) at the same time.
In particular, the film having a λ/4 function is more preferable as a film in which the liquid crystalline compound is horizontally aligned.
The "λ/4 function" is a function of converting linearly polarized light of a specific wavelength into circularly polarized light (or converting circularly polarized light into linearly polarized light).
The thickness of the other film is not particularly limited, but is preferably 5 to 60 μm, more preferably 5 to 30 μm.
The adhesive or bonding agent used for bonding to another film is not particularly limited, but bonding with an adhesive is preferably used because the change in bonding force (adhesive force) is small even after a predetermined time has elapsed after bonding and peeling can be performed as needed.
Examples of the binder include rubber binders, (meth) acrylic binders, silicone binders, urethane binders, vinyl alkyl ether binders, polyvinyl alcohol binders, polyvinyl pyrrolidone binders, polyacrylic acid amide binders, and cellulose binders.
Among them, acrylic adhesives (pressure-sensitive adhesives) are preferable from the viewpoint of transparency, weather resistance, heat resistance, and the like.
[ polarizing plate ]
The polarizing plate of the present invention is a polarizing plate comprising a retardation film obtained by peeling a temporary support from the transfer film of the present invention and a polarizer, wherein the polarizer is bonded to a surface of the retardation film via an adhesive or an adhesive.
In the case where the transfer film of the present invention has another film, the polarizing plate of the present invention includes a laminate of a retardation film obtained by peeling the temporary support from the transfer film and another film, and a polarizer, and the polarizer is bonded to the surface of the other film via an adhesive or a pressure-sensitive adhesive.
Fig. 3 and 4 show an example of a polarizing plate according to an embodiment of the present invention.
The polarizing plate 30 shown in fig. 3 includes a retardation film 2 and a polarizer 4.
The polarizing plate 40 shown in fig. 4 includes a retardation film 2, another film 3, and a polarizer 4.
[ polarizer ]
The polarizer included in the polarizing plate of the present invention is not particularly limited as long as it has a function of converting light into specific linearly polarized light, and conventionally known absorption polarizers and reflection polarizers can be used.
As the absorption type polarizer, an iodine type polarizer, a dye type polarizer using a dichroic dye, a polyene type polarizer, and the like can be used. The iodine type polarizer and the dye type polarizer may be applied to both of a coated type polarizer and a stretched type polarizer, but are preferably produced by adsorbing iodine or a dichroic dye to polyvinyl alcohol and stretching the adsorbed iodine or dichroic dye.
As a method for obtaining a polarizer by stretching and dyeing a polyvinyl alcohol layer in a state of being formed as a laminated film on a substrate, there can be mentioned japanese patent No. 5048120, japanese patent No. 5143918, japanese patent No. 5048120, japanese patent No. 4691205, japanese patent No. 4751481 and japanese patent No. 4751486, and known techniques related to these polarizers can also be preferably used.
As the reflective polarizer, a polarizer in which thin films having different birefringence are laminated, a wire grid polarizer, a polarizer in which cholesteric liquid crystal having a selective reflection region and a λ/4 plate are combined, or the like can be used.
Among them, from the viewpoint of more excellent adhesion, the adhesive composition preferably contains a polyvinyl alcohol resin (e.g., -CH)2-CHOH-as a repeating unit. In particular, at least one selected from the group consisting of polyvinyl alcohol and ethylene-vinyl alcohol copolymer).
The thickness of the polarizer is not particularly limited, but is preferably 3 to 60 μm, more preferably 5 to 30 μm, and still more preferably 5 to 15 μm.
The adhesive or bonding agent used for bonding the polarizer may be the same as that described for bonding the other films.
The method for producing the polarizing plate of the present invention is not particularly limited, and for example, when producing the polarizing plate of the embodiment shown in fig. 3, a method comprising: a bonding step of bonding a polarizer to a surface of the retardation film of the transfer film on the side opposite to the temporary support via an adhesive or a bonding agent; and a peeling step of peeling the temporary support after the bonding step to produce a polarizing plate.
In addition, when the polarizing plate of the embodiment shown in fig. 4 is produced, a method including: a bonding step of bonding a polarizer to a surface of the other film of the transfer film on the side opposite to the retardation film via an adhesive or a bonding agent; and a peeling step of peeling the temporary support body of the transfer film after the bonding step to manufacture the polarizing plate.
[ image display apparatus ]
An image display device of the present invention is an image display device having the polarizing plate of the present invention.
The display element used in the image display device of the present invention is not particularly limited, and examples thereof include a liquid crystal cell, an organic EL display panel, and a plasma display panel.
Among them, a liquid crystal cell and an organic EL display panel are preferable. That is, as the image display device of the present invention, a liquid crystal display device using a liquid crystal cell as a display element and an organic EL display device using an organic EL display panel as a display element are preferable.
[ liquid Crystal display device ]
A liquid crystal display device as an example of the image display device of the present invention is a liquid crystal display device having the polarizing plate and the liquid crystal cell of the present invention.
In the present invention, among the polarizing plates provided on both sides of the liquid crystal cell, the polarizing plate of the present invention is preferably used as the front polarizing plate, and the polarizing plates of the present invention are more preferably used as the front and rear polarizing plates.
Hereinafter, a liquid crystal cell constituting the liquid crystal display device will be described in detail.
< liquid Crystal cell >
The liquid crystal cell used In the liquid crystal display device is preferably a VA (Vertical Alignment: Vertical Alignment) mode, an OCB (Optically Compensated Bend) mode, an IPS (In-Plane-Switching: In-Plane-Switching) mode, or a TN (Twisted Nematic) mode, but is not limited thereto.
In a TN mode liquid crystal cell, when no voltage is applied, rod-like liquid crystalline molecules are aligned substantially horizontally and further twisted at 60 to 120 degrees. TN mode liquid crystal cells are most commonly used as color TFT liquid crystal display devices and are described in many documents.
In the VA mode liquid crystal cell, rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied. In the liquid crystal cell of VA mode, comprising: (1) a liquid crystal cell of a VA mode in a narrow sense in which rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied and aligned substantially horizontally when a voltage is applied (described in japanese patent application laid-open No. 2-176625); and (2) a liquid crystal cell (described in SID97, Digest of tech. papers 28(1997)845) in which the VA mode is multiloculated (MVA mode) in order to enlarge the viewing angle; and (3) a liquid crystal cell of a mode (n-ASM mode) in which rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied and twisted in a multi-domain alignment when a voltage is applied (described in proceedings 58 to 59(1998) of the japan liquid crystal council) and (4) a liquid crystal cell of a SURVIVAL mode (disclosed in LCD international 98). And any one of PVA (Patterned Vertical Alignment: Vertical Alignment) type, photo-Alignment (Optical Alignment) type and PSA (Polymer-stabilized Alignment: Polymer stabilized Alignment). The details of these modes are described in detail in Japanese patent laid-open Nos. 2006-215326 and 2008-538819.
In the IPS mode liquid crystal cell, rod-like liquid crystal molecules are aligned substantially parallel to the substrate, and the liquid crystal molecules respond in a planar manner by applying a parallel electric field to the substrate surface. The IPS mode displays black in a state where no electric field is applied, and absorption axes of a pair of upper and lower polarizing plates are orthogonal to each other. Methods for reducing light leakage in black display in an oblique direction and improving the viewing angle by using an optical compensation sheet are disclosed in japanese patent laid-open nos. 10-054982, 11-202323, 9-292522, 11-133408, 11-305217, and 10-307291.
[ organic EL display device ]
As an example of the image display device of the present invention, an organic EL display device is preferably provided with the polarizing plate and the organic EL display panel of the present invention in this order from the viewing side.
Among them, the polarizing plate of the present invention in the organic EL display device preferably has a polarizer, an arbitrary other film, and a retardation film arranged in this order from the viewing side, and more preferably has a λ/4 function in any of the retardation film or the other film and the retardation film.
The organic EL display panel is a display panel including organic EL elements in which an organic light-emitting layer (organic electroluminescent layer) is interposed between electrodes (between a cathode and an anode). The structure of the organic EL display panel is not particularly limited, and a known structure can be adopted.
Examples
The features of the present invention will be described in more detail below with reference to examples and comparative examples. The materials, amounts used, ratios, processing contents, processing steps and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention is not necessarily to be construed as being limited to the specific examples shown below.
[ example 1]
< preparation of transfer film >
The liquid crystal composition 1 prepared in the following composition was applied to a cellulose-based polymer film (TG40, manufactured by FUJIFILM Corporation) using a #3.5 bar.
Subsequently, the composition was heated with warm air at 40 ℃ for 60 seconds to dry the solvent of the composition and to cure the liquid crystalline compound in alignment.
Then, ultraviolet irradiation (300 mJ/cm) was performed at 40 ℃ in an atmosphere of 100ppm oxygen concentration under nitrogen purging2) Then, the alignment of the liquid crystalline compound was fixed to form a retardation layer, thereby producing a transfer film of example 1.
Rod-shaped liquid crystalline Compound (M-1)
[ chemical formula 3]
Rod-shaped liquid crystalline Compound (M-2)
[ chemical formula 4]
Rod-shaped liquid crystalline Compound (M-3)
[ chemical formula 5]
Carbamate monomer
[ chemical formula 6]
Polymerization initiator
[ chemical formula 7]
Fluorine-containing Polymer (M-5)
[ chemical formula 8]
Fluorine-containing Polymer (M-6)
[ chemical formula 9]
Onium salt compound S01
[ chemical formula 10]
[ examples 2 to 8]
A transfer film was produced in the same manner as in example 1, except that the conditions of the amount of monomer added, the type of initiator, the type of solvent, and the amount of exposure were changed to those shown in table 1 below.
In table 1 below, the initiator used in example 6 was irgacure oxe02 (manufactured by BASF) represented by the following formula.
[ chemical formula 11]
[ example 9]
A transfer film was produced in the same manner as in example 1 except that the monomer was changed to a-TMMT (pentaerythritol tetraacrylate) (SHIN-NAKAMURA CHEMICAL CO, ltd.).
[ chemical formula 12]
[ example 10]
A transfer film was produced in the same manner as in example 1, except that the monomer was changed to SP327 (manufactured by OSAKA ORGANIC CHEMICAL INDUSTRY ltd) described below.
[ chemical formula 13]
[ example 11]
A transfer film was produced in the same manner as in example 1, except that a PET (polyethylene terephthalate) film was used instead of the cellulose-based polymer film (TG40, manufactured by FUJIFILM Corporation).
[ example 12]
A transfer film was produced in the same manner as in example 11, except that the following alignment film was formed on a PET film, and the liquid crystal composition 1 was coated on the alignment film subjected to corona treatment.
< alignment film >
The non-liquid crystal composition 1 prepared in the composition shown below was coated on a PET film using a #8 wire bar.
Subsequently, the composition was heated with warm air at 40 ℃ for 60 seconds to dry the solvent, thereby forming a coating film having a thickness of 2.8 μm. Then, ultraviolet irradiation (300 mJ/cm) was performed at 40 ℃ in an atmosphere of 100ppm oxygen concentration under nitrogen purging2) Thereby, an alignment film was formed.
Next, corona treatment (output: 15 W.min/m) was performed2Carrying speed: 10 m/min).
[ example 13]
A transfer film was produced in the same manner as in example 12, except that the film thickness of the alignment film was changed to 2.0 μm.
[ example 14]
A transfer film was produced in the same manner as in example 12, except that the non-liquid crystal composition 1 was changed to the non-liquid crystal composition 2 prepared with the composition shown below.
[ example 15]
A transfer film was produced in the same manner as in example 12, except that the liquid crystal composition 2 having the following composition was used instead of the liquid crystal composition 1.
[ example 16]
A transfer film was produced in the same manner as in example 12, except that the non-liquid crystal composition 1 was changed to the non-liquid crystal composition 3 prepared with the composition shown below.
[ example 17]
A transfer film was produced in the same manner as in example 15, except that the non-liquid crystal composition 1 was changed to the non-liquid crystal composition 2.
Comparative examples 1 to 6
A transfer film was produced in the same manner as in example 1, except that the conditions of the amount of monomer added, the exposure amount, and the film thickness of the retardation layer were changed as shown in table 2 below.
Comparative example 7
A transfer film was produced in the same manner as in example 15, except that the loading of the monomers was changed to 20 parts by mass without providing an alignment film.
Comparative example 8
A transfer film was produced in the same manner as in example 10, except that the loading of the monomer was changed to 8 parts by mass.
[ evaluation ]
The transfer film thus produced was evaluated for breaking peel load, peel strength, concentration of liquid crystalline compound, suitability for processing, and transferability of the retardation film.
[ breaking peel load ]
The fracture peeling load of the transfer film thus produced was measured by the above method. The results are shown in tables 1 and 2 below.
[ Peel Strength ]
The peel strength between the temporary support and the retardation film was measured for the transfer film thus produced by the above-described method. The results are shown in tables 1 and 2 below.
[ concentration of liquid Crystal Compound ]
As a result of measuring the concentration of the liquid crystalline compound in the transfer film thus produced by the above-described method, the ratio of the concentration of the liquid crystalline compound at the interface between the retardation layer and the temporary support to the concentration of the liquid crystalline compound in the central portion of the retardation layer in the film thickness direction was 10%.
[ working aptitude ]
The transfer film thus produced was pressed against a roller and rubbed a predetermined number of times, and then the surface state thereof was determined by the following criteria. The results are shown in table 1 below.
A: after 100 times of rubbing, no scratch or peeling was generated
B: after rubbing for 60 times, no scratch or peeling occurred
C: after 30 times of rubbing, no scratch or peeling was generated
D: after 30 times of rubbing, scratching was caused, but peeling was not caused
E: after 30 times of rubbing, the film was scratched or peeled
[ transferability ]
In the transfer film thus produced, the retardation film side was bonded to the adhesive layer of the polarizer to which an adhesive (SK1478, manufactured by Soken Chemical & Engineering co., ltd.) was bonded, and then the temporary support was peeled from the end of the retardation film using a pair of tweezers.
As a result, the transfer properties of the transfer film thus produced were all good, and no lifting phenomenon or peeling marks were observed.
From the results shown in tables 1 and 2, it is understood that when the breaking peel load of the retardation layer adjacent to the temporary support is less than 0.4N/25mm, the processability is poor (comparative examples 1 to 8). From the results of comparative examples 1 to 6, it was found that even when the retardation layer was obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having 3 or more functions, the breaking and peeling load was less than 0.4N/25mm depending on the amount of the non-liquid crystal compound (monomer) added, the exposure amount, and the film thickness of the retardation layer.
On the other hand, it is found that when the retardation layer or the alignment film adjacent to the temporary support satisfies both requirement 1 and requirement 2, the retardation film has excellent processability and the transfer property of the retardation film is also good (examples 1 to 17).
Description of the symbols
1-temporary support, 2-phase difference film, 2 a-phase difference layer, 2 b-orientation film, 3-other film, 4-polarizer, 5-adhesive, 6-glass substrate, 7-UV curable resin composition, 8-TAC substrate, 10a, 10b, 20-transfer film, 30, 40-polaroid.
Claims (16)
1. A transfer film comprising a temporary support and a retardation film provided on the temporary support so as to be peelable therefrom,
the retardation film comprises a retardation layer disposed on the temporary support directly or via an alignment film,
the retardation layer is obtained by polymerizing a composition containing a liquid crystalline compound having a polymerizable group,
in the case where the retardation layer is disposed directly on the temporary support, the retardation layer satisfies both requirement 1 and requirement 2,
when the retardation layer is disposed on the temporary support via the alignment film, the alignment film satisfies both requirement 1 and requirement 2,
requirement 1: a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having 3 or more functions;
requirement 2: a layer having a breaking peel load of 0.4N/25mm or more.
2. The transfer film according to claim 1,
the non-liquid crystal compound has a molecular weight of 150 or less per 1 polymerizable group.
3. The transfer film according to claim 1 or 2,
the non-liquid crystal compound has a urethane bond in a molecule.
4. The transfer film according to any one of claims 1 to 3,
the peeling strength between the temporary support and the phase difference film is 0.05-0.60N/25 mm.
5. The transfer film according to any one of claims 1 to 4,
the retardation layer is disposed directly on the temporary support,
the retardation layer is obtained by polymerizing a composition containing a liquid crystalline compound having a polymerizable group and a non-liquid crystalline compound having a polymerizable group having 3 or more functions.
6. The transfer film according to claim 5,
the content of the non-liquid crystal compound is 6 parts by mass or more per 100 parts by mass of the liquid crystal compound.
7. The transfer film according to claim 5,
the content of the non-liquid crystal compound is more than 10 parts by mass and less than 30 parts by mass relative to 100 parts by mass of the liquid crystal compound.
8. The transfer film according to any one of claims 5 to 7,
the retardation layer has a structure obtained by copolymerizing the liquid crystalline compound and the non-liquid crystalline compound.
9. The transfer film according to any one of claims 5 to 8,
the phase difference layer satisfies the following requirement 3,
requirement 3: the concentration of the liquid crystalline compound at the interface between the retardation layer and the temporary support is 50% or less with respect to the concentration of the liquid crystalline compound in the central portion of the retardation layer in the film thickness direction.
10. The transfer film according to any one of claims 1 to 4,
the phase difference layer is disposed on the temporary support via the alignment film, and the alignment film satisfies the following requirement 4,
requirement 4: a layer obtained by polymerizing a composition containing a non-liquid crystal compound having a polymerizable group having a 3-or more-functional group in an amount of 80% by mass or more based on the total mass of the solid components of the non-liquid crystal compound.
11. The transfer film according to any one of claims 1 to 10, further having other films,
the other film is bonded to a surface of the retardation film on the side opposite to the temporary support via an adhesive or a bonding agent.
12. A polarizing plate comprising a retardation film obtained by peeling a temporary support from the transfer film according to any one of claims 1 to 10, and a polarizer,
the polarizer is attached to the surface of the phase difference film via an adhesive or a bonding agent.
13. A polarizing plate comprising a laminate of a retardation film obtained by peeling a temporary support from the transfer film according to claim 11 and another film, and a polarizer,
the polarizer is attached to the surface of the other film via an adhesive or bonding agent.
14. An image display device having the polarizing plate according to claim 12 or 13.
15. A method for producing a polarizing plate according to claim 12, comprising the steps of:
a bonding step of bonding a polarizer to a surface of the retardation film of the transfer film according to any one of claims 1 to 10, the surface being opposite to the temporary support, via an adhesive or a bonding agent; and
and a peeling step of peeling the temporary support after the bonding step to produce the polarizing plate.
16. A method for producing a polarizing plate according to claim 13, comprising the steps of:
a bonding step of bonding a polarizer to a surface of the other film of the transfer film according to claim 11, which is opposite to the retardation film, with an adhesive or a bonding agent interposed therebetween; and
and a peeling step of peeling the temporary support provided in the transfer film after the bonding step to produce the polarizing plate.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018180436 | 2018-09-26 | ||
| JP2018-180436 | 2018-09-26 | ||
| PCT/JP2019/037866 WO2020067291A1 (en) | 2018-09-26 | 2019-09-26 | Transfer film, polarizing plate, image display device, and method for producing polarizing plate |
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| Publication Number | Publication Date |
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| CN112840239A true CN112840239A (en) | 2021-05-25 |
| CN112840239B CN112840239B (en) | 2023-08-22 |
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| JP (1) | JP7166353B2 (en) |
| CN (1) | CN112840239B (en) |
| WO (1) | WO2020067291A1 (en) |
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| Publication number | Publication date |
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| WO2020067291A1 (en) | 2020-04-02 |
| JPWO2020067291A1 (en) | 2021-09-24 |
| JP7166353B2 (en) | 2022-11-07 |
| CN112840239B (en) | 2023-08-22 |
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