JP2018128664A - Polarizing film, image display device, and manufacturing method of the polarizing film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin polarizing film that is self-supporting and excellent in processability.SOLUTION: A polarizing film includes a polarizer and a support body formed on at least one surface of the polarizer, and the support body has a pattern structure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a polarizing film, an image display device, and a method for manufacturing a polarizing film.

  A conventional general polarizing plate used for an image display device includes a polarizer and a protective film disposed on one side or both sides of the polarizer. A polarizer is obtained by, for example, subjecting a hydrophilic polymer film such as a polyvinyl alcohol film to a dyeing process and a stretching process using a dichroic substance such as iodine or a dichroic dye. Further, in recent years, in response to a request for thinning of an optical member used in an image display device, a polyvinyl alcohol resin layer is formed on one side of a resin substrate, and a laminate of the resin substrate and the polyvinyl alcohol resin layer is formed. A technique for obtaining a thin polarizer of 10 μm or less by performing a dyeing process and a stretching process is known (Patent Document 1).

JP 2012-73580 A

  However, a conventional polarizing plate in which a protective film is laminated on a polarizer does not sufficiently meet the demand for thinning, and further thinning is required. On the other hand, a thin polarizer alone has low rigidity (low stiffness) and does not have self-supporting property. Therefore, the workability of the polarizer alone is low.

  The present invention has been made to solve the above-described conventional problems, and its main purpose is a thin polarizing film having self-supporting properties and excellent workability, an image display device including the polarizing film, And providing a method for producing a polarizing film.

The polarizing film of the present invention includes a polarizer and a support formed on at least one surface of the polarizer, and the support has a pattern structure.
In one embodiment, the thickness of the polarizer is 15 μm or less.
In one embodiment, the support has at least one structure selected from the group consisting of a honeycomb structure, a truss structure, a ramen structure, a stripe structure, and a circular structure.
In one embodiment, the thickness of the said support body is 1 micrometer-15 micrometers.
In one embodiment, the width | variety of the said support body in planar view is 500 micrometers-3000 micrometers.
In one embodiment, the support is optically isotropic.
In one embodiment, an embedding resin layer for embedding the support is provided on the one surface of the polarizer.
In one embodiment, the compression elastic modulus at 23 ° C. of the support is 0.01 GPa to 8.0 GPa.
According to another aspect of the present invention, an image display device is provided. The image display device includes the polarizing film.
According to another situation of this invention, the manufacturing method of a polarizing film is provided. This method for producing a polarizing film includes a step of forming a pattern of a resin material on at least one surface of a polarizer and a step of forming a support having a pattern structure by curing the resin material.

  According to the present invention, it is possible to provide a thin polarizing film having self-supporting properties and excellent workability, an image display device provided with the polarizing film, and a method for producing the polarizing film.

It is a top view of the polarizing film concerning one embodiment of the present invention. It is sectional drawing of the polarizing film which concerns on one Embodiment of this invention. It is a top view of the polarizing film concerning another embodiment of the present invention. It is a top view of the polarizing film concerning another embodiment of the present invention. It is a top view of the polarizing film concerning another embodiment of the present invention. It is a top view of the polarizing film concerning another embodiment of the present invention. It is sectional drawing of the polarizing film which concerns on another embodiment of this invention. It is sectional drawing of the polarizing film which concerns on another embodiment of this invention. It is the schematic for demonstrating a twist test. It is the schematic for demonstrating a U-order expansion-contraction test.

  Hereinafter, although embodiment of this invention is described, this invention is not limited to these embodiment.

A. FIG. 1 is a plan view of a polarizing film according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of a polarizing film according to one embodiment of the present invention. As shown in FIG. 2, the polarizing film 10 includes a polarizer 1 and a support 2 formed on one surface of the polarizer 1. The polarizing film 10 may be a single wafer shape or a long shape. The thickness of the polarizer 1 is typically 15 μm or less. The thickness of the support 2 is typically 1 μm to 15 μm, and the width of the support 2 in plan view is typically 500 μm to 3000 μm. The support 2 is preferably transparent, more preferably transparent and substantially optically isotropic. The support 2 has a pattern structure, and the pattern structure typically has a honeycomb structure as shown in FIG. The polarizing film 10 has higher rigidity (stronger stiffness) than a single polarizer and has a self-supporting property. Therefore, the polarizing film 10 can suppress curling and is excellent in handling properties and workability. Moreover, although the polarizing film 10 is thin compared with the conventional polarizing plate, it can maintain a film shape.

  3 to 6 are plan views of a polarizing film according to another embodiment of the present invention. The support may have a ramen structure as shown in FIG. 3 or may have a truss structure as shown in FIG. 4 and a circular structure as shown in FIG. Arranged structure) or a stripe structure as shown in FIG. As described above, when the patterned support 2 is formed on the surface of the polarizer 1, the amount of the material constituting the support is reduced compared to the case where the support is formed on the entire surface of the polarizer 1. Can do.

  FIG. 7 is a cross-sectional view of a polarizing film according to still another embodiment of the present invention. As shown in FIG. 7, the polarizing film 11 has a support 2 (hereinafter sometimes referred to as a first support 2) on one surface of the polarizer 1, and the other surface of the polarizer 1. It has a support 3 (hereinafter sometimes referred to as a second support 3). The second support 3 has a pattern structure. The pattern structure of the second support 3 may be the same as or different from the pattern structure of the first support 2. When the pattern structure of the first support 2 and the pattern structure of the second support 3 are the same, it is preferable that the first support 2 and the second support 3 are as shown in FIG. Is arranged so that the areas of the overlapping portions in a plan view are reduced. Thereby, compared with the polarizing film which has a support body only in one surface of a polarizer, the polarizing film 11 is higher rigidity, and its workability is high.

  FIG. 8 is a cross-sectional view of a polarizing film according to still another embodiment of the present invention. As shown in FIG. 8, the polarizing film 12 includes an embedding resin layer 4 that embeds the support 2 on one surface of the polarizer 1. Thereby, the level | step difference formed with the support body 2 can be smoothed. Furthermore, the surface of the polarizer 1 can be protected by the embedded resin layer 4 covering the exposed portion of the polarizer 1. Two or more of the above embodiments may be combined.

  The polarizer 1 typically has an absorption axis. The support 2 preferably includes a portion that intersects the absorption axis of the polarizer 1 in plan view. Specifically, in the example illustrated in FIG. 1, the support 2 has a honeycomb structure, and at least one side of the hexagon that forms the honeycomb structure intersects the absorption axis of the polarizer 1 in a plan view. More preferably, it crosses the support 2 at least at one point when tracing from an arbitrary point at one end of the sheet-like polarizing film 10 to the other end along a direction parallel to the absorption axis of the polarizer 1. To do. In the conventional polarizer, when a crack occurs, it can travel along the direction of the absorption axis of the polarizer so that the crack tears the polarizer. On the other hand, the polarizing film 10 of the present invention includes the support 2, and the support 2 includes a portion that intersects the absorption axis of the polarizer 1 in plan view, so that the support 2 is the polarizer 1. The progress of cracks (fissures) can be suppressed.

The polarizing film is preferably free from cracks extending from one end to the other end along the absorption axis direction of the polarizer, cracking of the polarizing film, and light leakage after the twist test. The torsion test should be performed in the following procedure using a planar unloaded twist testing machine (product name: main body TCDM111LH and jig: planar unloaded torsion testing jig) manufactured by Yuasa System Equipment Co., Ltd. Can do. As shown in FIG. 9, after fixing both short sides of the sheet-like polarizing film 10 of 120 mm (absorption axis direction) × 80 mm (transmission axis direction) with the twisting clips 18 and 19 of the testing machine, While one short side is fixed with the clip 19, the clip 18 on the other short side is twisted under the following conditions.
Twist speed: 10rpm
Twist angle: 45 degrees Twist number: 100 times

The polarizing film is preferably free from breakage of the polarizer, cracking of the polarizing film, and light leakage after the U-shaped stretch test. The U-shaped expansion test is performed by the following procedure using Yuasa System Equipment Co., Ltd. planar body unloaded U-shaped stretching tester (product name: main body DLDM111LH and jig: planar body unloaded U-shaped stretching test jig). Can be done. As shown in FIG. 10, both end portions x and y (50 mm) of a sheet-like polarizing film 10 of 100 mm (absorption axis direction) × 50 mm (transmission axis direction) are attached to the support portions 21 and 22 of the testing machine with double-sided tape. After fixing with (not shown), the polarizing film 10 is expanded and contracted under the following conditions so that one side (first surface) of the polarizing film 10 becomes U-shaped inward, and the polarizing film 10 is bent (first in the transmission axis direction). Bending on the surface side). In the U-shaped expansion / contraction, the bending R (bending radius) is set to 3 mm, and the polarizing film 10 is bent from the flat state until the polarizing film 10 comes into contact in a folded state. In the above bending, both ends x and y are brought into contact with both ends x and y by the operation of the support portion, and the other portions of the polarizing film 10 are unloaded from both outer sides by plate portions 23 and 24 which are separately installed. Make contact with them as if sandwiched between them. Moreover, the bending by the expansion / contraction is similarly performed on the other side (second surface) of the polarizing film 10 so as to be U-shaped inward (bending on the second surface side in the transmission axis direction).
Telescopic speed: 30rpm
Bending R: 3mm
Number of expansions / contractions: 100 times

B. Polarizer Any appropriate polarizer may be adopted as the polarizer. 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 composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films. In addition, there may be mentioned polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products. Preferably, a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.

  The dyeing with iodine is performed, for example, by immersing a PVA film in an iodine aqueous 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. Moreover, you may dye | stain after extending | stretching. If necessary, the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.

  As a specific example of a polarizer obtained by using a laminate, a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin Examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate. For example, a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it. A PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate can be produced by stretching and staining the PVA-based resin layer as a polarizer. . In this embodiment, stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching. Further, the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the boric acid aqueous 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 of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate. Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.

  The thickness of the polarizer is preferably 15 μm or less, more preferably 2 μm to 10 μm, and particularly preferably 3 μm to 8 μm. When the thickness of the polarizer is in such a range, curling during heating can be satisfactorily suppressed, and good appearance durability during heating can be obtained.

  The polarizer preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm. The single transmittance of the polarizer is preferably 42.0% to 46.0%, more preferably 44.5% to 46.0%. The polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.

C. Support The support has a pattern structure as described above. The support preferably has at least one structure selected from the group consisting of a honeycomb structure, a truss structure, a ramen structure, a stripe structure, and a circular structure. The support preferably has a honeycomb structure, a truss structure, or a circular structure, and particularly preferably has a honeycomb structure or a circular structure. When the support has a honeycomb structure, a truss structure, or a circular structure, when the polarizing film is stressed in one direction, the stress can be dispersed in a direction different from the direction, resulting in cracks in the polarizer. It is because generation | occurrence | production of this can be suppressed.

  The support is preferably transparent and substantially optically isotropic. In this specification, “substantially optically isotropic” means that the retardation value is small enough not to substantially affect the optical properties of the polarizing film. For example, the in-plane retardation Re (550) and the thickness direction retardation Rth (550) of the support are each preferably 20 nm or less, and more preferably 10 nm or less. Here, “Re (550)” is an in-plane retardation measured with light having a wavelength of 550 nm at 23 ° C. Re (550) is obtained by the formula: Re (550) = (nx−ny) × d, where d (nm) is the thickness of the layer (film). “Rth (550)” is a retardation in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C. Rth (550) is determined by the formula: Rth (550) = (nx−nz) × d, where d (nm) is the thickness of the layer (film). Note that “nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis). Direction), and “nz” is the refractive index in the thickness direction.

  As described above, the thickness of the support is preferably 1 μm to 15 μm, more preferably 3 μm to 8 μm. The ratio (t2 / t1) of the thickness (t2) of the support to the thickness (t1) of the polarizer is preferably 0.13 to 5.00, more preferably 0.38 to 4.00, More preferably, it is 0.63-3.33.

  The compressive elastic modulus at 23 ° C. of the support is preferably 0.01 GPa to 8.0 GPa, more preferably 0.02 GPa to 6.0 GPa. Thereby, the workability and flexibility of the polarizing film can be enhanced while suppressing the progress of cracks in the polarizer.

  The support can be formed of any appropriate material and method as long as it satisfies the above-described configuration and has sufficient adhesion to the polarizer. The adhesion of the support to the polarizer can be evaluated according to the cross-cut peel test of JIS K5400. The adhesion of the support to the polarizer is preferably 0 in the cross-cut peel test (number of substrates: 100).

In one embodiment, a support having a pattern structure is formed by forming a pattern of a resin material or a coating liquid containing a resin material on the surface of a polarizer and curing (or solidifying) the resin material. Can do. In another embodiment, the support can be formed by depositing an inorganic oxide such as SiO _{2 on} the surface of the polarizer.

  As the resin material, any appropriate material can be used as long as the effects of the present invention are obtained. Examples of the resin material include a polyester resin, a polyether resin, a polycarbonate resin, a polyurethane resin, a silicone resin, a polyamide resin, a polyimide resin, a PVA resin, an acrylic resin, an epoxy resin, and fluorine. Based resins. These may be used alone or in combination (for example, blend, copolymerization).

  The method of forming the resin material or the coating liquid pattern on the surface of the polarizer is not particularly limited. Examples of the method include printing, photolithography, ink jet, nozzle, and die coating. The pattern of the resin material or the coating liquid is preferably formed by printing. Examples of the method for printing the coating liquid in a pattern include a relief printing method, a direct gravure printing method, an intaglio printing method, a lithographic printing method, and a stencil printing method. The coating liquid can contain any appropriate other component in addition to the resin material as long as the effects of the present invention are not impaired. Examples of such other components include resin components other than the above resin materials as a main component, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, foils, softeners, anti-aging agents. , Conductive agents, ultraviolet absorbers, antioxidants, light stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts, and the like.

  Conditions for curing (or solidifying) the resin material (coating liquid) can be appropriately set according to the type of the resin material and the composition of the composition. For example, the resin material can be cured (or solidified) by drying, active energy ray curing, thermal curing, or the like.

D. Embedded resin layer The embedded resin layer embeds the support formed on one surface of the polarizer as described above. The thickness of the embedding resin layer is thicker than the thickness of the support, preferably 3 μm to 150 μm, more preferably 5 μm to 100 μm. The embedding resin layer may be any appropriate functional layer formed according to characteristics required for the polarizing film. Examples of the functional layer include a hard coat layer, a pressure-sensitive adhesive layer, and a transparent optical pressure-sensitive adhesive layer. When the embedded resin layer is a hard coat layer, the thickness is, for example, 5 μm to 15 μm. When the embedded resin layer is an adhesive layer, the thickness is, for example, 5 μm to 30 μm, and the embedded resin layer is transparent. When it is an optical adhesion layer, the thickness is 25 micrometers-125 micrometers, for example. The embedding resin layer is preferably transparent and substantially optically isotropic.

  The embedding resin layer can be formed by any appropriate material and method as long as it has sufficient adhesion to the polarizer and the support. In one embodiment, the embedding resin layer can be formed of a different type of resin material from the support. The embedding resin layer can be formed by forming a resin layer on the surface of the polarizer so as to embed the support and curing the resin layer.

  The method for forming the resin layer on the surface of the polarizer is not particularly limited. In one embodiment, a resin layer can be formed by apply | coating the coating liquid containing a resin material to the surface of a polarizer. Any appropriate application method can be used as the application method. Specific examples include curtain coating, dip coating, spin coating, print coating, spray coating, slot coating, roll coating, slide coating, blade coating, gravure coating, and wire bar method. It is done. Curing conditions can be appropriately set according to the type of resin material used and the composition of the composition. The coating liquid can contain any appropriate other component in addition to the resin material as long as the effects of the present invention are not impaired. Examples of such other components include resin components other than the above resin materials as a main component, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, foils, softeners, anti-aging agents. , Conductive agents, ultraviolet absorbers, antioxidants, light stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts, and the like.

E. Second Support As described above, when the pattern structure of the first support and the pattern structure of the second support are the same, the second support is preferably the first support in plan view. It arrange | positions so that the area of the part which overlaps with a body may become small. The configuration, function, and the like of the second support are as described in the section C for the support (first support).

F. Other Optical Film and Image Display Device The polarizing film can be used as an optical laminate in which other optical films such as a retardation film are laminated. Moreover, the polarizing film and the optical laminate described in the items A to E can be applied to an image display device such as a liquid crystal display device. Therefore, this invention includes the image display apparatus using the said polarizing film. The image display apparatus by embodiment of this invention is equipped with the polarizing film as described in said A term to E term | claim.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the examples shown below. In addition, all the parts and% in each example are based on weight. The room temperature standing conditions not specifically defined below are all 23 ° C. and 65% RH.

1. Production of Polarizer <Production Example 1>
One side of an amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 μm) having a water absorption of 0.75% and Tg of 75 ° C. is subjected to corona treatment. Alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd. An aqueous solution containing 9: 1 ratio of the trade name “Gosefimer Z200”) was applied and dried at 25 ° C. to form a PVA-based resin layer having a thickness of 11 μm, thereby preparing a laminate. The obtained laminate was uniaxially stretched in the longitudinal direction (longitudinal direction) 2.0 times between rolls having different peripheral speeds in an oven at 120 ° C. (air-assisted stretching process). Next, the laminate was immersed in an insolubilization bath (a boric acid aqueous solution obtained by blending 4 parts by weight of boric acid with respect to 100 parts by weight of water) for 30 seconds (insolubilization treatment). Subsequently, it was immersed in a dyeing bath having a liquid temperature of 30 ° C. while adjusting the iodine concentration and the immersion time so that the polarizing plate had a predetermined transmittance. In this production example, 0.2 parts by weight of iodine was blended with 100 parts by weight of water, and immersed in an aqueous iodine solution obtained by blending 1.0 part by weight of potassium iodide (dyeing treatment). . Subsequently, it was immersed for 30 seconds in a crosslinking bath having a liquid temperature of 30 ° C. (a boric acid aqueous solution obtained by blending 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water). (Crosslinking treatment). Thereafter, the laminate was immersed in a boric acid aqueous solution (an aqueous solution obtained by blending 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 70 ° C. However, uniaxial stretching was performed between rolls having different peripheral speeds in the longitudinal direction (longitudinal direction) so that the total stretching ratio was 5.5 times (in-water stretching treatment). Thereafter, the laminate was immersed in a cleaning bath (an aqueous solution obtained by blending 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C. (cleaning treatment). Thus, a polarizer laminate A including a polarizer having a thickness of 5 μm was obtained.
<Production Example 2>
A polarizer laminate B including a polarizer having a thickness of 7 μm was produced in the same manner as in Production Example 1 except that the thickness of the PVA-based resin layer after coating and drying was changed to 15 μm.
<Production Example 3>
A polyvinyl alcohol film having an average polymerization degree of 2400 and a saponification degree of 99.9 mol% and a thickness of 30 μm was immersed in warm water at 30 ° C. for 60 seconds to swell. Next, the film was dyed while being immersed in an aqueous solution of 0.3% concentration of iodine / potassium iodide (weight ratio = 0.5 / 8) and stretched to 3.5 times. Then, it extended | stretched so that the total draw ratio might be 6 time in 65 degreeC borate ester aqueous solution. After stretching, drying was performed in an oven at 40 ° C. for 3 minutes to obtain a PVA polarizer C. The thickness of the obtained polarizer C was 12 μm.

2. Production of Support Forming Material <Production Example 4>
100 parts of urethane acrylate oligomer (manufactured by Nippon Synthetic Chemical Co., Ltd., “purple light UV7560B”), 20 parts of N- (2-hydroxyethyl) acrylamide (manufactured by Kojin Co., “HEAA”), photoinitiator (manufactured by BASF, “ 3 parts of IRUGACURE907 ") was added, and a coating agent A having a solid content concentration adjusted so that it could be applied at a specified film thickness using methyl isobutyl ketone as a solvent was obtained.
<Production Example 5>
To 100 parts of urethane acrylate oligomer (manufactured by Nippon Synthetic Chemical Co., Ltd., “purple light UV7000B”), 20 parts of N- (2-hydroxyethyl) acrylamide (manufactured by Kojin Co., “HEAA”), photoinitiator (manufactured by BASF, “ IRUGACURE907 ") 3 parts was added, and a coating agent B having a solid content adjusted so as to be applied at a specified film thickness was obtained using methyl isobutyl ketone as a solvent.
<Production Example 6>
100 parts of urethane acrylate oligomer (manufactured by Nippon Synthetic Chemical Co., Ltd., “purple light UV3520TL”), 20 parts of N- (2-hydroxyethyl) acrylamide (manufactured by Kojin Co., “HEAA”), photoinitiator (manufactured by BASF, “ 3 parts of IRUGACURE 907 ") was added, and a coating agent C having a solid content adjusted so as to be applied at a specified film thickness using methyl isobutyl ketone as a solvent was obtained.
<Production Example 7>
To 100 parts of urethane acrylate oligomer (manufactured by Nippon Synthetic Chemical Co., Ltd., “purple light UV6640B”), 20 parts of N- (2-hydroxyethyl) acrylamide (manufactured by Kojin Co., “HEAA”), photoinitiator (manufactured by BASF, “ 3 parts of IRUGACURE907 ") was added, and a coating agent D having a solid content concentration adjusted so that it could be applied at a specified film thickness using methyl isobutyl ketone as a solvent was obtained.
<Production Example 8>
Using UV curable screen ink (Imperial Ink Co., Ltd. “UV FIL Screen Ink 611 White” (solid content 76%)) and diluting solvent (Imperial Ink Co., Ltd. “RE-806 Reducer”) The coating agent E which adjusted solid content concentration so that it could apply | coat with a film thickness was obtained.

<Production Example 9>
100 parts of urethane acrylate oligomer (manufactured by Nippon Synthetic Chemical Co., Ltd., “purple light UV1700”), 20 parts of N- (2-hydroxyethyl) acrylamide (manufactured by Kojin Co., “HEAA”), photoinitiator (manufactured by BASF, “ IRUGACURE907 ") 3 parts was added, and a coating agent F having a solid content adjusted so that it could be applied at a specified film thickness using methyl isobutyl ketone as a solvent was obtained.

<Example 1>
On the surface of the polarizer laminate A on the polarizer side, the coating agent A was applied in a honeycomb shape so that the thickness after curing was 7 μm, and dried under conditions of 60 ° C. and 120 seconds. In addition, for the coating of the coating agent, a precision desktop printing machine (manufactured by Neurong Seimitsu Kogyo Co., Ltd., “DP-320 type”) and a screen plate (mesh size # 500, wire diameter 18 μm, thickness formed into a honeycomb pattern) 38 μm, emulsion thickness 10 μm).
Thereafter, the coating material is cured by irradiating ultraviolet rays with an integrated light quantity of 500 mJ / cm ^{2 with} a high-pressure mercury lamp to support a honeycomb structure (line width: 1.0 mm, length of one side of regular hexagon: 4.0 mm). A body (first support) was formed. Next, a surface protective film (manufactured by Nitto Denko Corporation, “RP301”) was bonded onto the support, and the amorphous PET substrate of the polarizer laminate A was peeled off. Then, the polarizing film 1 which has a polarizer and a 1st support body was produced by peeling a surface protection film.

<Example 2>
A polarizing film 2 was produced in the same manner as in Example 1 except that the coating agent B was used as the coating agent.

<Example 3>
A polarizing film 3 was produced in the same manner as in Example 1 except that the coating agent C was used as the coating agent.

<Example 4>
A polarizing film 4 was produced in the same manner as in Example 1 except that the coating material D was used as the coating material.

<Example 5>
A polarizing film 5 was produced in the same manner as in Example 1 except that the coating E was used as the coating.

<Example 6>
The coating agent E was applied to the surface of the polarizer laminate A on the polarizer side in a honeycomb shape so that the thickness after curing was 7 μm, and dried under conditions of 60 ° C. and 120 seconds. In addition, for the coating of the coating agent, a precision desktop printing machine (manufactured by Neurong Seimitsu Kogyo Co., Ltd., “DP-320 type”) and a screen plate (mesh size # 500, wire diameter 18 μm, thickness formed into a honeycomb pattern) 38 μm, emulsion thickness 10 μm).
Thereafter, the coating material is cured by irradiating ultraviolet rays with an integrated light quantity of 500 mJ / cm ^{2 with} a high-pressure mercury lamp to support a honeycomb structure (line width: 1.0 mm, length of one side of regular hexagon: 4.0 mm). A body (first support) was formed. Next, a surface protective film (manufactured by Nitto Denko Corporation, “RP301”) was bonded onto the support, and the amorphous PET substrate of the polarizer laminate A was peeled off.
Next, using the coating agent E, the first support and the surface opposite to the surface on which the first support of the polarizer is formed are overlapped with the first support in plan view. Similarly, a second support having a honeycomb structure (line width: 1.0 mm, length of one side of regular hexagon: 4.0 mm) was formed. Then, the polarizing film 6 which has a polarizer and a 1st and 2nd support body was produced by peeling a surface protection film.

<Example 7>
A polarizing film 7 was produced in the same manner as in Example 6 except that the thickness of the first and second supports was 3 μm.

<Example 8>
A polarizing film 8 was produced in the same manner as in Example 6 except that the thickness of the first and second supports was 5 μm.

<Example 9>
A polarizing film 9 was produced in the same manner as in Example 6 except that the thickness of the first and second supports was 14 μm.

<Example 10>
The apex of the regular hexagon of the second support in plan view overlaps the center of the regular hexagon of the first support (so that the positions of the first support and the second support are shifted from each other in plan view). ) A polarizing film 10 was produced in the same manner as in Example 6 except that the second support was formed.

<Example 11>
The polarizing film 11 and the polarizing film 11 with an adhesive layer were produced like Example 10 except having used the polarizer laminated body B as a polarizer laminated body.

<Example 12>
On one surface of the polarizer C, the coating agent E was applied in a honeycomb shape so that the thickness after curing was 7 μm, and dried under conditions of 60 ° C. and 120 seconds. In addition, for the coating of the coating agent, a precision desktop printing machine (manufactured by Neurong Seimitsu Kogyo Co., Ltd., “DP-320 type”) and a screen plate (mesh size # 500, wire diameter 18 μm, thickness formed into a honeycomb pattern) 38 μm, emulsion thickness 10 μm).
Thereafter, the coating material is cured by irradiating ultraviolet rays with an integrated light quantity of 500 mJ / cm ^{2 with} a high-pressure mercury lamp to support a honeycomb structure (line width: 1.0 mm, length of one side of regular hexagon: 4.0 mm). A body (first support) was formed. Next, a surface protective film (manufactured by Nitto Denko Corporation, “RP301”) was bonded onto the support.
Next, using the coating material E, the regular hexagonal apex of the second support is the first support in a plan view on the surface of the polarizer C opposite to the surface on which the first support is formed. A honeycomb structure (line width: 1) in the same manner as the first support so as to overlap the center of the regular hexagon of the body (so that the positions of the first support and the second support are shifted from each other in plan view). A second support body having a length of 0.0 mm and a side of a regular hexagon of 4.0 mm was formed. Then, the polarizing film 12 which has a polarizer and a 1st and 2nd support body was produced by peeling a surface protection film.

<Example 13>
A polarizing film 13 was produced in the same manner as in Example 10 except that the line width of the honeycomb structure of the first and second supports was 1.8 mm.

<Example 14>
A polarizing film 14 was produced in the same manner as in Example 10 except that the line width of the honeycomb structure of the first and second supports was 0.8 mm and the length of one side of the regular hexagon was 3.0 mm. .

<Example 15>
A polarizing film 15 was produced in the same manner as in Example 10 except that the line width of the honeycomb structure of the first and second supports was 0.5 mm, and the length of one side of the regular hexagon was 2.0 mm. .

<Example 16>
A polarizing film 16 was produced in the same manner as in Example 10 except that the line width of the honeycomb structure of the first and second supports was 1.5 mm and the length of one side of the regular hexagon was 2 mm.

<Example 17>
A coating is applied using a screen plate (mesh size # 500, wire diameter 18 μm, thickness 38 μm, emulsion thickness 10 μm) formed into a truss-like pattern, and the first and second supports are formed into truss structures (line width: 0). .6 mm, the length of one side of the triangle: 4.0 mm), and the vertex of the triangle of the second support overlaps with the center of the triangle of the first support in plan view (first support in plan view). A polarizing film 17 was produced in the same manner as in Example 10 except that the second support was formed (so that the positions of the body and the second support were shifted from each other).

<Example 18>
A polarizing film 18 was produced in the same manner as in Example 17 except that the line width of the truss structure of the first and second supports was 0.5 mm and the length of one side of the triangle was 5.5 mm.

<Example 19>
The coating agent was applied using a screen plate (mesh size # 500, wire diameter 18 μm, thickness 38 μm, emulsion thickness 10 μm) formed into a ramen-shaped pattern, and the first and second supports were made into a ramen structure (line width: 1). 0.0 mm and the length of one side of the square: 4.0 mm) so that the top of the square of the second support overlaps the center of the square of the first support in plan view (first support in plan view). A polarizing film 19 was produced in the same manner as in Example 10 except that the second support was formed (so that the positions of the body and the second support were shifted from each other).

<Example 20>
A polarizing film 20 was produced in the same manner as in Example 19 except that the line width of the ramen structure of the first and second supports was 1.3 mm and the length of one side of the triangle was 3.0 mm.

<Example 21>
The coating was applied using a screen plate (mesh size # 500, wire diameter 18 μm, thickness 38 μm, emulsion thickness 10 μm) formed into a stripe pattern, and the first and second supports were attached to the absorption axis of the polarizer. Example 6 except that a stripe structure (line width: 1.0 mm, stripe interval: 4.0 mm) extending in an orthogonal direction was used, and the second support was formed so as to overlap the first support in plan view. In the same manner as described above, a polarizing film 21 was produced.

<Example 22>
A polarizing film 22 was produced in the same manner as in Example 1 except that the coating agent F was used as the coating agent, and the thickness of the support was 5 μm.

<Comparative Example 1>
A surface protective film (“RP301” manufactured by Nitto Denko Corporation) was bonded to the surface of the polarizer laminate A on the polarizer side, and the amorphous PET substrate of the polarizer laminate A was peeled off. Then, the polarizing film 23 which consists of polarizers was produced by peeling a surface protection film.

<Comparative example 2>
A polarizing film 24 was produced in the same manner as in Example 21 except that the first and second supports had a stripe structure extending in a direction parallel to the absorption axis of the polarizer.

<Comparative Example 3>
The polarizer C was used as a polarizing film 25.

<Comparative example 4>
40 parts by weight of N-hydroxyethylacrylamide (HEAA), 60 parts by weight of acryloylmorpholine (ACMO), and 3 parts by weight of a photoinitiator (“IRGACURE 819” manufactured by BASF) were mixed to prepare an ultraviolet curable adhesive.
The adhesive is applied to the polarizer-side surface of the polarizer laminate A so that the thickness after curing is 1 μm, and the easy-adhesion-treated surface of the (meth) acrylic resin film having a lactone ring structure is corona-treated. After bonding a protective film (thickness: 40 μm) formed by applying an ultraviolet ray as an active energy ray, the adhesive was cured. In addition, ultraviolet irradiation is performed using a gallium-filled metal halide lamp (Fusion UV Systems, Inc., product name “Light HAMMER10”, bulb: V bulb, peak illuminance: 1600 mW / cm ² , integrated dose 1000 / mJ / cm ² (wavelength 380-440 nm)) was used. The illuminance of ultraviolet rays was measured using a spectral illuminometer (product name “Sola-Check System” manufactured by Solatell).
Next, the amorphous PET base material of the polarizer laminate A was peeled off to produce a polarizing film 26 having a polarizer and a protective film.

<Comparative Example 5>
Polarizing film in the same manner as in Comparative Example 4 except that a protective film (thickness: 20 μm) obtained by subjecting a (meth) acrylic resin film having a lactone ring structure to an easily adhesive-treated surface as a protective film was subjected to corona treatment. 27 was produced.

<Evaluation>
The polarizing films 1 to 27 were subjected to the following adhesion test, twist test, and U-shaped stretch test. The evaluation results are shown in Table 1.

<Adhesion test>
The adhesion of the first support to the polarizer was measured according to the cross-cut peel test (number of bases: 100) of JIS K5400, and evaluated according to the following criteria.
○: The number of peels of the first support is zero.
X: The number of peeling of the first support is 1 or more.

<Torsion test>
It was performed using a planar body no-load twist tester (product name: main body TCDM111LH) and jig (planar body no-load twist test jig) manufactured by Yuasa System Equipment Co., Ltd. The state of the twist test is shown in FIG.
The polarizing film was cut into a size of 120 mm (absorption axis direction) × 80 mm (transmission axis direction) to obtain a test sample. After sandwiching and fixing both short sides of the sample with the twisting clips 18 and 19 of the testing machine, the clip 18 on the other short side is fixed under the following conditions while one short side is fixed with the clip 19. Twisted.
Twist speed: 10rpm
Twist angle: 45 degrees Twist number: 100 times The state of the sample after the twist test was visually evaluated according to the following criteria. In addition, when there was a sample that could not be measured due to deformation or curling of the sample, it was determined that the sample was not measurable.
◯: No cracking or light leakage occurred. And there were no creases left.
Δ: No cracking or light leakage occurred. However, fold marks remained. X: Cracks and light leakage occurred. And there were creases left.

<U-shaped stretch test>
It was performed using a planar body unloaded U-shaped expansion / contraction tester (product name: main body DLDM111LH) and jig (planar body unloaded U-shaped expansion / contraction testing jig) manufactured by Yuasa System Equipment Co., Ltd. The state of the U-shaped expansion / contraction test is shown in FIG.
The polarizing film was cut into a size of 100 mm (absorption axis direction) × 50 mm (transmission axis direction) to obtain a test sample. After fixing both ends of the sample to the clamp parts 21 and 22 of the testing machine with double-sided tape (not shown), the sample is stretched so that one side (first surface) becomes U-shaped inward. The above sample was bent under the following conditions. In U-shaped expansion and contraction, the bending R (bending radius) was set to 3 mm, and the sample was bent from a flat state so that the sample was folded in two. In the above bending, both ends x and y are brought into contact with both ends x and y by the operation of the clamp, and the other parts of the sample are sandwiched from both outsides with no load by the plate parts 23 and 24 separately provided. I made it.
In addition, the bending by the expansion and contraction was performed in the same manner as described above so that the other one side (second surface) of the rectangular object was U-shaped inward.
Telescopic speed: 30rpm
Bending R: 3mm
Number of expansions / contractions: 100 times The state of the sample of the U-shaped expansion / contraction test was visually evaluated according to the following criteria. In addition, when there was a sample that could not be measured due to deformation or curling of the sample, it was determined that the sample was not measurable.
◯: No cracking or light leakage occurred. And there were no creases left.
X: Cracking or light leakage occurred. Or a crease was confirmed.

<Compressive modulus of support>
The compression elastic modulus at 23 ° C. of the support was measured by the following procedure.
The coating material A is applied to the surface of the polarizer laminate A on the polarizer side so that the thickness after curing is 5 μm, and is dried under conditions of 60 ° C. and 120 seconds. Sample A in which a layer of a cured product (solidified product) made of coating material A was formed was prepared. Similarly, samples B to F were prepared using the coating agents B to F. Using the prepared samples A to F, the compression modulus was measured by the following method, and the value of the compression modulus obtained by the measurement was defined as the compression modulus at 23 ° C. of the supports A to F.
TI900 TriboIndenter (manufactured by Hystron) was used for the measurement of the compression modulus.
The sample obtained above was cut into a size of 10 mm × 10 mm, fixed to a support equipped with a TriboIndenter, and the compression modulus was measured by a nanoindentation method. At that time, the position was adjusted so that the used indenter pushed in the vicinity of the center of the cured product. The measurement conditions are shown below.
Working indenter: Berkovich (triangular pyramid type)
Measuring method: Single indentation measurement Measuring temperature: 23 ° C
Indentation depth setting: 100 nm
The compression elastic modulus at 23 ° C. of the supports A to F was as follows.
Support A (Coating agent A): 2.57 GPa
Support B (coating agent B): 0.84 GPa
Support C (Coating C): 0.07 GPa
Support D (Coating D): 0.42 GPa
Support E (Coating E): 0.02 GPa
Support F (Coating agent F): 5.38 GPa

As is clear from Table 1, the polarizing films of Comparative Examples 1 to 3 had low handling properties (self-supporting properties) to the extent that measurement by a twist test and a U-shaped stretch test was impossible. Further, the polarizing films of Comparative Examples 4 and 5 had cracks and light leakage, and fold marks remained.
On the other hand, the polarizing film of Examples 1-22 was a favorable result in any evaluation of an adhesiveness test, a twist test, and a U-shaped expansion-contraction test.

  The polarizing film of the present invention is suitably used for image display devices such as liquid crystal display devices and organic EL display devices.

DESCRIPTION OF SYMBOLS 1 Polarizer 2 Support body (1st support body)
3 Support body (second support body)
4 Embedded resin layer 10 Polarizing film 11 Polarizing film 12 Polarizing film

Claims (10)

A polarizer and a support formed on at least one surface of the polarizer,
A polarizing film in which the support has a pattern structure.   The polarizing film according to claim 1, wherein the polarizer has a thickness of 15 μm or less.   The polarizing film according to claim 1, wherein the support has at least one structure selected from the group consisting of a honeycomb structure, a truss structure, a ramen structure, a stripe structure, and a circular structure.   The polarizing film in any one of Claims 1-3 whose thickness of the said support body is 1 micrometer-15 micrometers.   The polarizing film in any one of Claims 1-4 whose width | variety of the said support body in planar view is 500 micrometers-3000 micrometers.   The polarizing film according to claim 1, wherein the support is optically isotropic.   The polarizing film in any one of Claims 1-6 provided with the embedding resin layer which embeds the said support body in said one surface of the said polarizer.   The polarizing film in any one of Claims 1-7 whose compression elastic modulus in 23 degreeC of the said support body is 0.01 GPa-8.0 GPa.   An image display apparatus provided with the polarizing film in any one of Claims 1-8. Forming a resin material pattern on at least one surface of the polarizer;
And a step of curing the resin material to obtain a support having a pattern structure.

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