KR20180092891A - Polarizing film, image display apparatus, and method of producing polarizing film - Google Patents

Abstract

According to an embodiment of the present invention, a polarizing film includes a polarizer and a support. The support is formed on at least one surface of the polarizer. The support has a pattern structure. A 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 curing the resin material to provide a support having a pattern structure. It is possible to provide a thin polarizing film having self-supportability and excellent workability.

Description

TECHNICAL FIELD [0001] The present invention relates to a polarizing film, a polarizing film, an image display,

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

The subject is 35 U.S.C. Japanese Patent Application No. 2017-022682 filed on February 10, 2017, and Japanese Patent Application No. 2017-232237 filed on December 4, 2017, both of which are incorporated herein by reference in their entirety, All of which are incorporated herein by reference.

A general polarizing plate in a related field used in an image display device includes a polarizing film and a protective film disposed on one side or both sides of the polarizing film. The polarizer is obtained, for example, by subjecting a hydrophilic polymer film such as a polyvinyl alcohol-based film to a dyeing treatment with a dichroic substance such as iodine or a dichroic dye, and a stretching treatment. In addition, in recent years, the following techniques have been known in accordance with the demand for thinning of the optical member used in the image display apparatus (see Japanese Patent Application Laid-Open No. 7-73580). A thin polarizer having a thickness of 10 占 퐉 or less is obtained by forming a polyvinyl alcohol-based resin layer on one side of a resin substrate; Is obtained by subjecting a laminate of a resin substrate and a polyvinyl alcohol-based resin layer to a dyeing treatment and a stretching treatment.

However, a conventional polarizing plate obtained by laminating a protective film on a polarizer does not sufficiently satisfy the demand for thinning, and therefore, further thinning has been required. On the other hand, a thin polarizer alone has low rigidity (low flexural strength) and does not have any self-supportability. Therefore, the workability of the polarizer alone is low.

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and a main object of the present invention is to provide a thin polarizing film having self-supportability and excellent workability, an image display device including the polarizing film, .

A polarizing film according to an embodiment of the present invention comprises a polarizer; And a support formed on at least one side of the polarizer, wherein the support has a pattern structure.

In one embodiment of the present invention, the thickness of the polarizer is 15 占 퐉 or less.

In one embodiment of the present invention, the support has at least one structure selected from the group consisting of a honeycomb structure, a truss structure, a rigid-frame structure, a stripe structure, and a circular structure.

In one embodiment of the present invention, the thickness of the support is from 1 탆 to 15 탆.

In one embodiment of the present invention, the width of the support at plan view is 500 탆 to 3000 탆.

In one embodiment of the present invention, the support has optical isotropy.

In one embodiment of the present invention, the polarizing film further comprises a buried resin layer configured to embed said support on said one side of the polarizer.

In one embodiment of the present invention, the support has a compressive modulus at 23 DEG C of from 0.01 GPa to 8.0 GPa.

According to another aspect of the present invention, an image display apparatus is provided. The image display apparatus includes the polarizing film.

According to another aspect of the present invention, a method of manufacturing a polarizing film is provided. The method for producing a polarizing film includes the steps of: forming a pattern of a resin material on at least one surface of a polarizer; And curing the resin material to provide a support having a pattern structure.

According to the present invention, it is possible to provide a thin polarizing film having self-supportability and excellent workability, an image display apparatus including the polarizing film, and a method of manufacturing the polarizing film.

1 is a plan view of a polarizing film according to one embodiment of the present invention.
2 is a cross-sectional view of a polarizing film according to one embodiment of the present invention.
3 is a plan view of a polarizing film according to another embodiment of the present invention.
4 is a plan view of a polarizing film according to another embodiment of the present invention.
5 is a plan view of a polarizing film according to another embodiment of the present invention.
6 is a plan view of a polarizing film according to another embodiment of the present invention.
7 is a cross-sectional view of a polarizing film according to another embodiment of the present invention.
8 is a cross-sectional view of a polarizing film according to another embodiment of the present invention.
Fig. 9 is a schematic diagram for explaining a torsion test. Fig.
10 is a schematic view for explaining a U-shape folding test.

Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to these embodiments.

 A. Overall composition of polarizing film

1 is a plan view of a polarizing film according to one embodiment of the present invention. 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 has a polarizer 1 and a support 2 formed on one side of the polarizer 1. As shown in Fig. The polarizing film 10 may be in the form of a sheet or an elongated shape. The thickness of the polarizer 1 is typically 15 μm or less. The thickness of the support 2 is typically between 1 탆 and 15 탆 and the width of the support 2 during planar is typically between 500 탆 and 3000 탆. The support 2 is preferably transparent, more preferably transparent and substantially optically isotropic. The support 2 has a pattern structure, and typically has a honeycomb structure as shown in Fig. 1 as a pattern structure. The polarizing film 10 has higher rigidity (higher bending strength) and self-supporting property than the polarizer alone. Therefore, the polarizing film 10 can suppress curling, and is excellent in handleability and workability. In addition, the polarizing film 10 can maintain its film shape even though it is thin compared to the related-art polarizing plate.

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, a truss structure as shown in Fig. 4, or a circular structure as shown in Fig. 5 (a structure in which circles are arranged in a matrix manner) Or may have a stripe structure as shown in Fig. As described above, when the pattern-like support 2 is formed on the surface of the polarizer 1, the amount of the material constituting the support can be reduced as compared with the case where the support is formed on the entire surface of the polarizer 1 .

7 is a cross-sectional view of a polarizing film according to another embodiment of the present invention. 7, the polarizing film 11 has a support 2 (hereinafter referred to as a "first support 2") on one side of the polarizer 1 and a polarizer 1 on the other side of the polarizer 1 (Hereinafter referred to as "second support 3"). The second support 3 has a pattern structure. The pattern structure of the second support body 3 may be the same as or different from the pattern structure of the first support body 2. [ When the pattern structure of the first support body 2 and the pattern structure of the second support body 3 are identical to each other, as shown in Fig. 7, the first support body 2 and the second support body 3 It is preferable that the area of the overlapped portion is arranged as small as possible. Thus, the polarizing film 11 has higher rigidity and workability than a polarizing film having a support on only one side of the polarizer.

8 is a cross-sectional view of a polarizing film according to another embodiment of the present invention. As shown in Fig. 8, the polarizing film 12 includes a buried resin layer 4 configured to embed the support 2 on one side of the polarizer 1. As shown in Fig. Thus, the step formed by the support 2 can be smoothed. In addition, the buried resin layer 4 can protect the surface of the polarizer 1 by covering the exposed portion of the polarizer 1. In addition, two or more of the above embodiments may be combined.

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 shown in Fig. 1, the support 2 has a honeycomb structure, and at least one side of a hexagon, which constitutes the honeycomb structure in plan view, crosses the absorption axis of the polarizer 1. When the path from one end to the other end of the sheet-like polarizing film 10 advances along a direction parallel to the absorption axis of the polarizer 1, it is more preferable that the path crosses the support 2 at at least one place desirable. When a crack is generated in a conventional polarizer, the crack may proceed along the absorption axis direction of the polarizer to tear the polarizer. In contrast, the polarizing film 10 of the present invention has the support 2, and the support 2 includes a portion intersecting the absorption axis of the polarizer 1 in plan view, so that the support 2 is bonded to the polarizer 1 It is possible to suppress the progress of cracks (cracks) in the cracks.

The polarizing film is preferably free from cracks, a crack of the polarizing film and light leakage from one end to the other end along the absorption axis direction of the polarizer after the torsion test is performed. The torsion test was performed by using a load-member torsion tester (trade name: MAIN BODY TCDM111LH) and a jig (load-member torsion test for a planar object) manufactured by Yuasa System Co., Ltd. Jig) can be used in the following procedure. As shown in Fig. 9, both short sides of the sheet-like polarizing film 10 of 120 mm (absorption axis direction) x 80 mm (transmission axis direction) were fitted and fixed to the twisting clips 18 and 19 of the tester. Thereafter, while one side of the short side was fixed with the clip 19, the clip 18 on the other side of the short side was twisted under the following conditions.

Torsion speed: 10 rpm

Torsion angle: 45 degrees

Torsion frequency: 100 times

The polarizing film preferably has no breakage of the polarizer, cracking of the polarizing film and light leakage after the U-shaped folding test. The U-type folding test was carried out by using a load-unfolded U type folding tester (trade name: main body DLDM111LH) and a jig (load-unfolded U type folding test jig for a planar object) manufactured by Yuasa Systems Co., In order. 10, both end portions (x, y) (50 mm) of the sheet-like polarizing film 10 in the direction of 100 mm (absorption axis direction) × 50 mm (transmission axis direction) (Not shown). Thereafter, the polarizing film 10 was bent (bending of the first surface in the direction of the transmission axis) by folding under the following conditions so that one surface (first surface) of the polarizing film 10 was U-shaped inward. In the U-shaped folding process, the bending (R) (bending radius) is set to be 3 mm, and the polarizing film 10 is folded from the planar state to the half-folded state until 1/2 of the film comes into contact with another half . The other end portions of the polarizing film 10 are brought into contact with each other between the plate portions 23 and 24 which are separately provided during bending so that the end portions x and y are brought into contact with each other by the operation of a supporting portion, Without any load from both sides thereof. Further, the bending due to the folding is similarly folded (bending on the second surface side in the transmission axis direction) so that the other surface (second surface) of the polarizing film 10 is also U-shaped inside.

 Folding speed: 30 rpm

 Bending (R): 3 mm

 Number of folds: 100 times

 B. Polarizer

 As the polarizer, any suitable polarizer can be employed. 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 the polarizer including the single-layer resin film include a hydrophilic polymer film such as a polyvinyl alcohol (PVA) film, a partially formal PVA film, and an ethylene-vinyl acetate copolymerization system partial saponification film, A dyeing treatment and a stretching treatment using a dichroic substance such as a dyestuff, and the resultant polarizer; A polyene-based oriented film such as a dehydrated product of PVA or a dehydrochlorinated product of polyvinyl chloride. Preferably, a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching is used because of its excellent optical properties.

The dyeing by iodine is performed, for example, by immersing a PVA-based film in an aqueous iodine solution. The elongation of the uniaxial stretching is preferably 3 to 7 times. The stretching may be carried out after the dyeing treatment or may be carried out while dyeing. It may also be dyed after stretching. If necessary, the PVA film is subjected to swelling treatment, cross-linking treatment, washing treatment, drying treatment, and the like. For example, the PVA film may be dipped in water and washed with water before dyeing to clean the surface of the PVA film and the antiblocking agent. In addition, the PVA film can be swollen to prevent staining unevenness and the like.

Specifically, for example, a polarizer obtained by using a laminate may be a laminate of a resin base material and a PVA-based resin layer (PVA-based resin film) laminated on the resin base material, or a laminate of a resin base material and a PVA And a polarizer obtained by using a laminate with a resin layer. A polarizer obtained by using a laminate of a resin substrate and a PVA resin layer coated and formed on the resin substrate can be produced by, for example, applying a PVA resin solution to a resin substrate; Drying the solution to form a PVA resin layer on the resin substrate to provide a laminate of the resin substrate and the PVA resin layer; And stretching and dyeing the laminate to convert the PVA resin layer into a polarizer. In this embodiment, the stretching typically involves stretching the laminate while immersing the laminate in an aqueous boric acid solution. In addition, the stretching may further include aerial stretching the laminate at a high temperature (for example, 95 캜 or higher) before stretching in an aqueous boric acid solution, if necessary. The obtained laminate of the resin substrate / polarizer may be used as it is (that is, the resin substrate may be used as the protective layer for the polarizer). Alternatively, the resin substrate may be peeled off from the laminate of the resin substrate / polarizer, and any suitable protective layer may be laminated on the peeled surface to obtain the product obtained as described above. Details of the method for producing such a polarizer are described, for example, in Japanese Patent Laid-Open Publication No. 7-73580. The above publication is incorporated herein by reference in its entirety.

The thickness of the polarizer is preferably 15 占 퐉 or less, more preferably 2 占 퐉 to 10 占 퐉, and particularly preferably 3 占 퐉 to 8 占 퐉. When the thickness of the polarizer is within this range, curling at the time of heating can be suppressed satisfactorily and satisfactory appearance durability during heating can be obtained.

The polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm. The single-layer transmittance of the polarizer is preferably 42.0% to 46.0%, more preferably 44.5% to 46.0%. The degree of polarization 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. This is because when the support has a honeycomb structure, a truss structure, or a circular structure, when the polarizing film is stressed in one direction, stress can be dispersed in a direction different from the direction, and as a result, The occurrence can be suppressed.

Preferably, the support is transparent and substantially optically isotropic. The term "substantially optically isotropic" as used herein means that the retardation value is small so as not to substantially affect the optical characteristics of the polarizing film. For example, the in-plane retardation Re (550) and the thickness direction retardation Rth (550) of the support are preferably 20 nm or less, and more preferably 10 nm or less. As used herein, "Re (550) " refers to the in-plane retardation measured with light at a wavelength of 550 nm at 23 deg. Re 550 is determined by the formula "Re (550) = (nx-ny) xd", where d (nm) is the thickness of the layer (film). "Rth (550)" is a retardation in the thickness direction measured by light having a wavelength of 550 nm at 23 deg. Rth (550) is obtained by the formula "Rth (550) = (nx-nz) xd", where d (nm) is the thickness of the layer (film). "Nx" is a refractive index in a direction in which the in-plane refractive index becomes maximum (that is, in the slow axis direction), and "ny" is a refractive index in a direction orthogonal to the slow axis Direction), and "nz" is the refractive index in the thickness direction.

As described above, the thickness of the support is preferably 1 탆 to 15 탆, more preferably 3 탆 to 8 탆. 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, still more preferably 0.63 to 3.33.

The support preferably has a compressive modulus at 23 캜 of from 0.01 GPa to 8.0 GPa, more preferably from 0.02 GPa to 6.0 GPa. As a result, the workability and flexibility of the polarizing film can be improved while suppressing the progress of cracking of the polarizer.

The support may be formed by any suitable material and method as long as it satisfies the above-mentioned constitution and has sufficient adhesion with the polarizer. The adhesion between the polarizer and the support can be evaluated in accordance with the cross-cut peeling test of JIS K5400. The adhesion between the polarizer and the support is preferably such that the number of peeled-off grids in a checkerboard peeling test (number of grids: 100) is zero.

In one embodiment, the support having a pattern structure can be formed by forming a pattern of a coating liquid containing a resin material or a resin material on the surface of the polarizer, and curing (or solidifying) the resin material. In still other embodiments, the support may be formed by depositing an inorganic oxide such as SiO ₂ on the surface of the polarizer.

As the resin material, any suitable material can be used as long as the effect of the present invention can be obtained. Examples of the resin material include thermoplastic resins such as polyester resins, polyether resins, polycarbonate resins, polyurethane resins, silicone resins, polyamide resins, polyimide resins, PVA resins, acrylic resins, And a fluorine-based resin. These resin materials may be used alone or in combination (for example, a blend or a copolymer thereof).

The method of forming the resin material or the pattern of the coating liquid on the surface of the polarizer is not particularly limited. Such methods include, for example, printing, photolithography, inkjet methods, nozzles, die coating, and the like. The pattern of the resin material or the coating liquid is preferably formed by printing. Examples of the method of printing the coating liquid in a pattern shape include a convex printing method, a direct gravure printing method, a concave printing method, a flat printing method, a stencil printing method and the like. The coating liquid may contain, in addition to the resin material, any other appropriate components as long as the effect of the present invention is not impaired. Examples of such other components include resin components other than the resin material as the main component, a tackifier, an inorganic filler, an organic filler, a metal powder, a pigment, a foil material, a softener, an antioxidant, a conductive agent, An antioxidant, a light stabilizer, a surface lubricant, a leveling agent, a corrosion inhibitor, a heat stabilizer, a polymerization inhibitor, a lubricant, a solvent and a catalyst.

Conditions for curing (or solidifying) the resin material (coating liquid) may be appropriately set depending on the kind of the resin material and the composition of the composition. For example, the resin material can be cured (or solidified) by drying, activation energy ray curing, or thermal curing.

D. Embedded resin layer

The embedding resin layer embeds a support formed on one side of the polarizer, as described above. The thickness of the buried resin layer is thicker than the thickness of the support, preferably 3 탆 to 150 탆, more preferably 5 탆 to 100 탆. The embedding resin layer may be any appropriate functional layer formed according to the 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 embedding resin layer is a hard coat layer, its thickness is, for example, 5 to 15 占 퐉. When the embedding resin layer is a pressure-sensitive adhesive layer, its thickness is, for example, 5 to 30 占 퐉, In the case of an adhesive layer, the thickness thereof is, for example, 25 탆 to 125 탆. Preferably, the buried resin layer is transparent and substantially optically isotropic.

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

The method of forming the resin layer on the surface of the polarizer is not particularly limited. In one embodiment, a coating liquid containing a resin material may be applied to the surface of the polarizer to form a resin layer. Any suitable application method can be used as the application method. Specific examples thereof include a coating method such as a curtain coating method, a dip coating method, a spin coating method, a printing coating method, a spray coating method, a slot coating method, a roll coating method, a slide coating method, a blade coating method, a gravure coating method, . The curing conditions can be appropriately set according to the type of the resin material used and the composition of the composition. The coating liquid may contain, in addition to the resin material, any other appropriate components as long as the effect of the present invention is not impaired. Such other components include, for example, resin components other than the resin material as the main component, a tackifier, an inorganic filler, an organic filler, a metal powder, a pigment, a foil material, a softening agent, an antioxidant, a conductive agent, 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 arranged such that the area of the portion overlapping the first support in plan view is as small as possible. The structure, function and the like of the second support body are the same as those described in the section C regarding the support body (first support body).

F. Other optical films and image display devices

The polarizing film can be used as an optical laminate in which any other optical film such as a retardation film is laminated on the film. In addition, the polarizing film and the optical laminated body described in the items A to E above can be applied to an image display apparatus such as a liquid crystal display apparatus. Therefore, the present invention includes an image display apparatus using the polarizing film. An image display device according to an embodiment of the present invention includes the polarizing film described in the items A to E above.

[Example]

Hereinafter, the present invention will be described by way of examples, but the present invention is not limited to the examples described below. Further, in each embodiment, parts and percentages are all by weight unless otherwise specified. Unless otherwise stated, the following room temperature standing conditions are all 23 deg. C and 65% RH.

1. Preparation of Polarizers

≪ Preparation Example 1 &

One side of a substrate of amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 mu m) having a water absorption rate of 0.75% and a Tg of 75 DEG C was subjected to corona treatment. On this corona-treated side, polyvinyl alcohol (degree of polymerization: 4200, saponification degree: 99.2 mol%) and acetoacetyl modified PVA (degree of polymerization: 1200, acetoacetyl modification degree: 4.6%, degree of saponification: 99.0 mol% An aqueous solution containing 9: 1 by weight of a commercial product "GOHSEFIMER Z200", manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., was applied at 25 ° C and dried to form a film having a thickness of 11 μm Of the PVA resin layer. Thus, a laminate was produced. The resultant laminate was subjected to free-end uniaxial stretching (air-assisted stretching treatment) in an oven at 120 캜 at 2.0 times in the machine direction (longitudinal direction) between rolls having different peripheral speeds. Subsequently, the laminate was immersed (insolubilized) for 30 seconds in an insolubilizing bath having a liquid temperature of 30 DEG C (an aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water). Subsequently, the laminate was immersed in a dyeing bath at a liquid temperature of 30 캜 while adjusting the iodine concentration and immersion time so that the polarizing plate had a predetermined transmittance. In this Production Example, 0.2 part by weight of iodine was blended with 100 parts by weight of water, and 1.0 part by weight of potassium iodide was blended, followed by immersion for 60 seconds in an aqueous iodine solution (dyeing treatment). Subsequently, the resultant was immersed in a crosslinking bath (aqueous solution of boric acid obtained by mixing 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30 占 폚 for 30 seconds (crosslinking treatment). Thereafter, the laminate was immersed in a boric acid aqueous solution having a liquid temperature of 70 캜 (aqueous solution obtained by blending 4 parts by weight of boric acid with 100 parts by weight of water and 5 parts by weight of potassium iodide) The laminate was uniaxially stretched so that the total elongation in the longitudinal direction was 5.5 times (underwater stretching treatment). Thereafter, the laminate was immersed in a washing bath (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) at a liquid temperature of 30 占 폚 (washing treatment). Thus, a polarizer laminate A including a polarizer having a thickness of 5 占 퐉 was obtained.

≪ Preparation Example 2 &

A polarizer laminate B including a polarizer having a thickness of 7 탆 was produced in the same manner as in Production Example 1, except that the thickness of the PVA resin layer was changed to 15 탆 after coating and drying.

≪ Preparation Example 3 &

A polyvinyl alcohol film having an average degree of polymerization of 2400 and a degree of saponification of 99.9 mol% and a thickness of 30 mu m was immersed in hot water at 30 DEG C for 60 seconds to swell. Subsequently, the film was dipped in an aqueous solution containing 0.3% of a mixture of iodine and potassium iodide (weight ratio of "iodine / potassium iodide" = 0.5 / 8), and the film was dyed while being stretched to 3.5 times. Thereafter, the film was stretched so that the total elongation was 6 times in an aqueous solution of boric ester at 65 캜. After stretching, the film was dried in an oven at 40 占 폚 for 3 minutes to obtain a PVA polarizer (C). The thickness of the obtained polarizer (C) was 12 占 퐉.

2. Fabrication of support forming materials

≪ Preparation Example 4 &

(2-hydroxyethyl) acrylamide (manufactured by Kohjin Co Co., Ltd.) was added to 100 parts of a urethane acrylate oligomer (manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., "SHIKOH UV-7560B" 3 parts of "IRUGACURE 907" manufactured by BASF) and 20 parts of a photoinitiator (manufactured by BASF) and using methyl isobutyl ketone as a solvent, An application agent A in which the solid content concentration was adjusted so that it could be applied was obtained.

≪ Production Example 5 &

(2-hydroxyethyl) acrylamide (manufactured by Kojin Chemical Co., Ltd., "HEAA") was added to 100 parts of a urethane acrylate oligomer (manufactured by The Nippon Synthetic Chemical Industry Co., ) And 3 parts of a photoinitiator (manufactured by BASF; "IGACURE 907") were added, and a coating agent B was prepared by adjusting the solid concentration so that the coating agent could be applied to a specified thickness using methylisobutylketone as a solvent .

≪ Production Example 6 &

(2-hydroxyethyl) acrylamide (manufactured by Kojin Chemical Co., Ltd., "HEAA") was added to 100 parts of a urethane acrylate oligomer (manufactured by The Nippon Synthetic Chemical Industry Co., ) And 3 parts of a photoinitiator (manufactured by BASF; "IGACURE 907") were added, and a coating agent C was prepared by adjusting the solid concentration so that the coating agent could be applied to a specified thickness using methylisobutylketone as a solvent .

≪ Production Example 7 >

(2-hydroxyethyl) acrylamide (manufactured by Kojin Chemical Co., Ltd., "HEAA") was added to 100 parts of a urethane acrylate oligomer (manufactured by The Nippon Synthetic Chemical Industry Co., ) And 3 parts of a photoinitiator (manufactured by BASF; "IGACURE 907") were added, and a coating agent D was prepared by adjusting the solid concentration so that the coating agent could be applied to a specified thickness using methylisobutylketone as a solvent .

≪ Production Example 8 &

UV-curable screen ink (manufactured by Teikoku Printing Inks Mfg. Co., Ltd., "UV FIL screen ink 611 white" (solid content 76%)) and diluting solvent A coating agent E was prepared by adjusting the solid content concentration so that the coating agent could be applied to a specified thickness by using "RE-806 Redderer" manufactured by Kokus Printing Ink Menu Packing Co., Ltd. [

≪ Production Example 9 &

(2-hydroxyethyl) acrylamide (manufactured by Kojin Chemical Co., Ltd., "HEAA ") was added to 100 parts of a urethane acrylate oligomer (manufactured by The Nippon Synthetic Chemical Industry Co., ) And 3 parts of a photoinitiator (manufactured by BASF; "IGACURE 907") were added, and a coating agent F having a solid concentration adjusted so that the coating agent could be applied to a specified thickness using methyl isobutyl ketone as a solvent .

≪ Example 1 >

The coating agent A was coated on the side of the polarizer side of the polarizer laminate A in a honeycomb shape so as to have a thickness after curing of 7 mu m and dried under the conditions of 60 DEG C and 120 seconds. For the application of the coating agent, a precision tabletting machine (Model DP-320 manufactured by Newlong Seimitsu Kogyo Co., Ltd.) and a screen printing plate (mesh size: # 500, wire diameter: 18 mu m, thickness: 38 mu m, emulsifier thickness: 10 mu m) was used.

Thereafter, the coating agent was cured by irradiating ultraviolet rays of an integrated light quantity of 500 mJ / cm ² from a high-pressure mercury lamp. Thereafter, a support (first support) having a honeycomb structure (line width: 1.0 mm, length of one side of a regular hexagon: 4.0 mm) was formed. Subsequently, a surface protective film (manufactured by Nitto Denko Corporation; "RP301") was bonded to the support to peel off the amorphous PET substrate of the polarizer laminate A. Thereafter, the surface protective film was peeled off. Thus, a polarizing film (1) having a polarizer and a first support was produced.

≪ 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 a coating agent.

≪ Example 3 >

A polarizing film 3 was prepared in the same manner as in Example 1, except that Coating Agent C was used as a coating agent.

<Example 4>

A polarizing film (4) was produced in the same manner as in Example 1 except that the coating agent (D) was used as a coating agent.

&Lt; Example 5 >

A polarizing film (5) was prepared in the same manner as in Example 1, except that the coating agent (E) was used as a coating agent.

&Lt; Example 6 >

A coating agent E was coated on the polarizer side of the polarizer laminate A in a honeycomb shape so as to have a thickness after curing of 7 mu m and dried under the conditions of 60 DEG C and 120 seconds. For the application of the coating agent, a screen printing plate (mesh size: # 500, wire diameter: 18 占 퐉, diameter: 18 占 퐉) molded in a honeycomb pattern and a precision tabletop printer (manufactured by Nylon Seimitsu Kogyo Co., Thickness: 38 mu m, emulsifier thickness: 10 mu m) was used.

Thereafter, the coating agent was cured by irradiating with a high-pressure mercury lamp an ultraviolet ray having an accumulated light quantity of 500 mJ / cm ² . (First support) having a honeycomb structure (line width: 1.0 mm, length of one side of a regular hexagon: 4.0 mm) was formed. Subsequently, 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, using the coating agent E, a honeycomb structure (having a line width of 1.0 mm, one side of a regular hexagon) was formed in the same manner as the first support so as to overlap with the first support on a plane opposite to the plane on which the first support of the polarizer was formed Length: 4.0 mm) was formed. Thereafter, the surface protective film was peeled off. A polarizing film (6) having a polarizer and first and second supports was prepared.

&Lt; Example 7 >

A polarizing film 7 was prepared in the same manner as in Example 6, except that the thickness of the first and second supports was set to 3 탆.

&Lt; Example 8 >

A polarizing film 8 was prepared in the same manner as in Example 6 except that the thickness of the first and second supports was set to 5 탆.

&Lt; Example 9 >

A polarizing film 9 was prepared in the same manner as in Example 6 except that the thickness of the first and second supporting members was set to 14 탆.

&Lt; Example 10 >

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

&Lt; Example 11 >

A polarizing film 11 and a polarizing film 11 with a pressure-sensitive adhesive layer were produced in the same manner as in Example 10, except that the polarizer laminate B was used as the polarizer laminate.

&Lt; Example 12 >

The coating agent E was coated on one surface of the polarizer C in a honeycomb shape so as to have a thickness of 7 mu m after curing and dried under the conditions of 60 DEG C and 120 seconds. A screen printing plate (mesh size: # 500, wire diameter: 18 占 퐉, thickness: 20 mm) molded in a honeycomb pattern was placed in a precision tabletting machine (Model DP-320 manufactured by Nylon Seimitsu Kogyo Co., Ltd.) 38 탆, emulsifier thickness: 10 탆) was used.

Thereafter, the coating agent was cured by irradiating with a high-pressure mercury lamp an ultraviolet ray having an accumulated light quantity of 500 mJ / cm ² . Thus, a support (first support) having a honeycomb structure (line width: 1.0 mm, length of one side of a regular hexagon: 4.0 mm) was formed. Subsequently, a surface protective film (manufactured by Nitto Denko Corporation; "RP301") was bonded onto the support.

Subsequently, on the surface opposite to the surface of the polarizer C on which the first support member is formed, the vertex of the regular hexahedron of the second support member is superimposed on the center of the regular hexahedron of the first support member A first support having a honeycomb structure (line width: 1.0 mm, length of one side of a regular hexagon: 4.0 mm) was formed in the same manner as the first support so that the positions of the first support and the second support were shifted from each other. Thereafter, the surface protective film was peeled off. Thus, a polarizing film 12 having a polarizer and first and second supports was produced.

&Lt; Example 13 >

A polarizing film 13 was prepared in the same manner as in Example 10, except that the line width of the honeycomb structure of the first and second supports was set at 1.8 mm.

&Lt; Example 14 >

Except that the linear width of the honeycomb structure of the first and second supports was set to 0.8 mm and the length of one side of the regular hexagon of the honeycomb structure was set to 3.0 mm. Respectively.

&Lt; Example 15 >

The polarizing film 15 was prepared in the same manner as in Example 10 except that the line width of the honeycomb structure of the first and second supports was set to 0.5 mm and the length of one side of the regular hexagon of the honeycomb structure was set to 2.0 mm. Respectively.

&Lt; Example 16 >

The 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 set at 1.5 mm and one length of the regular hexagon of the honeycomb structure was set at 2 mm Respectively.

&Lt; Example 17 >

A coating agent E was applied using a screen printing plate (mesh size: # 500, wire diameter: 18 mu m, thickness: 38 mu m, emulsifier thickness: 10 mu m) molded in a truss-like pattern; The structure of the first and second supports is a truss structure (line width: 0.6 mm, length of one side of a triangle: 4.0 mm); Except that the second support body was formed so that the apex of the triangle of the second support body in the plan view overlaps the center of the triangle of the first support body so that the positions of the first support body and the second support body are shifted from each other , And the polarizing film 17 was produced in the same manner as in Example 10. [

&Lt; Example 18 >

Setting a line width of the truss structure of each of the first and second supports to 0.5 mm; The polarizing film 18 was produced in the same manner as in Example 17, except that the length of one side of the triangle of the truss structure was set to 5.5 mm.

&Lt; Example 19 >

A coating agent E was applied using a screen printing plate (mesh size: # 500, wire diameter: 18 mu m, thickness: 38 mu m, emulsifier thickness: 10 mu m) molded in a raymen-like pattern; The structure of the first and second supports is a laminate structure (line width: 1.0 mm, length of one side of a square: 4.0 mm); Except that the second support body is formed so that the square vertices of the second support body are overlapped with the center of the square of the first support body in plan view (the positions of the first support body and the second support body are shifted from each other in plan view) A polarizing film (19) was produced in the same manner as in Example 10.

&Lt; Example 20 >

The line width of the laminate structure of each of the first and second supports is set to 1.3 mm; The polarizing film 20 was produced in the same manner as in Example 19, except that the length of one side of the square of the lamellar structure was set to 3.0 mm.

&Lt; Example 21 >

A coating agent E was applied using a screen printing plate (mesh size: # 500, wire diameter: 18 mu m, thickness: 38 mu m, emulsifier thickness: 10 mu m) molded in a stripe pattern; The structure of each of the first and second supports is a stripe structure (line width: 1.0 mm, stripe interval: 4.0 mm) extending in the direction orthogonal to the absorption axis of the polarizer; The polarizing film 21 was produced in the same manner as in Example 6, except that the second support was formed so as to overlap the first support in plan view.

&Lt; Example 22 >

A polarizing film 22 was prepared in the same manner as in Example 1, except that the coating agent F was used as a coating agent and the thickness of the support was set to 5 mu m.

&Lt; Comparative Example 1 &

A surface protective film (manufactured by Nitto Denko Corporation; "RP301") was bonded to the polarizer side surface of the polarizer laminate A and the amorphous PET substrate of the polarizer laminate A was peeled off. Thereafter, the surface protective film was peeled off. Thus, a polarizing film 23 made of a polarizer was produced.

&Lt; Comparative Example 2 &

The polarizing film 24 was produced in the same manner as in Example 21, except that the structure of each of the first and second supports was set to a stripe structure that stretched in a direction parallel to the absorption axis of the polarizer.

&Lt; Comparative Example 3 &

The polarizer (C) was used as the polarizing film (25).

&Lt; 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 (manufactured by BASF; "IGACURE 819") were mixed to prepare an ultraviolet curable adhesive Respectively.

The adhesive was applied to the polarizer side of the polarizer laminate A such that the thickness after curing was 1 占 퐉. To the easy-adhesion treated side of the (meth) acrylic resin film having a lactone ring structure, (Thickness: 40 占 퐉) were bonded to each other. Thereafter, the adhesive was cured by irradiating ultraviolet rays as active energy rays. In the ultraviolet irradiation, a gallium-doped metal halide lamp (trade name: "Light HAMMER 10" manufactured by Fusion UV Systems, Inc., bulb: V bulb, peak illuminance: 1600 mW / cm ² , and the cumulative irradiation amount: 1000 mJ / cm ² (wavelength: 380 to 440 nm)) was used. The illuminance of the ultraviolet ray was measured using a spectroradiometer (trade name: "Sola-Check system", manufactured by Solatell Ltd.).

Subsequently, the amorphous PET substrate of the polarizer laminate A was peeled off. A polarizing film 26 having a polarizer and a protective film was prepared.

&Lt; Comparative Example 5 &

As a protective film, in the same manner as in Comparative Example 4, except that the protective film (thickness: 20 占 퐉) obtained by corona treatment on the easy-to-treat surface of the (meth) acrylic resin film having a lactone ring structure was used. To prepare a polarizing film 27. [

<Evaluation>

The polarizing films 1 to 27 were subjected to the following adhesion test, twist test and U-shaped folding test, respectively. The evaluation results are shown in Table 1 below.

<Adhesion Test>

The adhesion of the first support to the polarizer was measured according to a checkerboard peeling test (number of grids: 100) of JIS K5400 and evaluated according to the following criteria.

?: The number of peeled grids of the first support is zero.

X: The number of peeled grids of the first support is at least 1.

<Torsional test>

A torsion test was conducted using a load-and-lean torsion tester (trade name: main body TCDM111LH) and a jig (load-member torsion test jig for a planar object) manufactured by Yuasa System Co., Ltd. for planar objects. The manner of the torsion test is shown in Fig.

The polarizing film was cut to a size of 120 mm (absorption axis direction) × 80 mm (transmission axis direction) to obtain a test sample. Both short sides of the sample were fitted and fixed to the twist clips (18, 19) of the tester. Thereafter, while one of the shorter sides was fixed with the clip 19, the other clip 18 of the shorter side was twisted under the following conditions.

Torsion speed: 10 rpm

Torsion angle: 45 degrees

Torsion frequency: 100 times

After the torsion test, the state of the sample was visually evaluated based on the following criteria. Further, when there is a sample which can not be measured for cracks and light omission due to deformation or curling of the sample, the sample was judged to be unmeasurable.

?: Cracks and light leakage did not occur. Also, there was no residue of curved traces.

C: Cracks and light leakage did not occur. However, a curved trail remained.

X: Cracks and light leakage occurred. On the other hand, a curved trail remained.

 <U-shaped folding test>

A U-type folding test was carried out using a load-unfolded U-shaped folding tester (main body DLDM111LH) and a jig (load-unfolded U-type folding test jig for a planar object) manufactured by Yuasa Systems Co., . Fig. 10 shows a U-shaped folding test.

The polarizing film was cut into a size of 100 mm (absorption axis direction) x 50 mm (transmission axis direction) to obtain a test sample. Both ends (x and y) of the sample were fixed with a double-sided tape (not shown) to the supports 21 and 22 of the tester. Thereafter, one side (first side) of the sample was folded inward to the U-shape under the following conditions, and the sample was bent. In the U-shaped folding process, the bending (R) (bending radius) was set to be 3 mm, and the sample was bent so as to be in a two-folded state in a planar state. During bending, both end portions (x, y) are brought into contact with each other by the action of a clamp, and other portions of the sample are held between the separately provided plate portions 23, 24 without any load from both sides thereof , Respectively.

Further, in the bending due to the folding, the other side (second side) of the sample acting as a rectangular product was folded inwardly into a U shape in the same manner as described above.

Folding speed: 30 rpm

Bending R: 3 mm

Number of folds: 100 times

The state of the sample after the U-shaped folding test was visually evaluated based on the following criteria. Further, when there is a sample which can not be measured for cracks and light omission due to deformation or curling of the sample, the sample was judged to be unmeasurable.

?: Cracks and light leakage did not occur. Also, there was no residue of curved traces.

C: Cracks or light leakage occurred. Otherwise, a curved trail was identified.

 <Compressive Modulus of Support>

The compression modulus of the support at 23 DEG C was measured by the following procedure.

Coating agent A was coated on the polarizer side of polarizer laminate A so that the thickness after curing became 5 占 퐉 and dried under the conditions of 60 占 폚 and 120 seconds. Thus, a sample A in which a layer of a cured product (solidified product) composed of the coating agent A was formed on the polarizer laminate A was prepared. Similarly, Samples B to F were prepared using Coating agents B to F. [ Using the prepared Samples A to F, the compressive modulus was measured by the following method, and the value of the compressive modulus obtained from the measurement was defined as the compressive modulus at 23 deg. C of the supports A to F. [

A TI900 TriboIndenter (manufactured by Hysitron, Inc) was used to measure the compressive modulus.

The samples thus obtained were each cut into a size of 10 mm x 10 mm, fixed to a support mounted on a triboindenter, and the compressive modulus was measured by the nanoindentation method. At this time, the position of the indenter used was adjusted so that the indenter used would press in the vicinity of the center of the cured product. Measurement conditions are shown below.

Used indenter: Berkovich (triangular)

Measuring method: Single indentation measurement

Measuring temperature: 23 ° C

Indentation depth setting: 100nm

The compressive moduli of the supports A to F at 23 DEG C were as follows.

Support A (Coating agent A): 2.57 GPa

Support B (Coating agent B): 0.84 GPa

Support C (coating agent C): 0.07 GPa

Support D (Coating agent D): 0.42 GPa

Support E (coating agent E): 0.02 GPa

Support F (coating agent F): 5.38 GPa

 [Table 1]

As can be seen from Table 1, each of the polarizing films of Comparative Examples 1 to 3 was low in handleability (self-supporting property) to the extent that measurement of the twist test and the U-shaped folding test was impossible. Further, in each of the polarizing films of Comparative Examples 4 and 5, cracks and light leakage occurred, and a curved trail remained.

On the other hand, the polarizing films of Examples 1 to 22 showed satisfactory results in the adhesion test, the twist test and the U-shaped folding test.

The polarizing film of the present invention is suitably used for an image display apparatus such as a liquid crystal display apparatus or an organic EL display apparatus.

Claims (10)

A polarizer; And
And a support formed on at least one surface of the polarizer,
Wherein the support has a pattern structure. The method according to claim 1,
Wherein the polarizer has a thickness of 15 占 퐉 or less. 3. The method according to claim 1 or 2,
Wherein the support has at least one structure selected from the group consisting of a honeycomb structure, a truss structure, a rigid-frame structure, a stripe structure, and a circular structure. 3. The method according to claim 1 or 2,
Wherein the support has a thickness of 1 占 퐉 to 15 占 퐉. 3. The method according to claim 1 or 2,
Wherein the support has a width in a plan view of 500 탆 to 3000 탆. 3. The method according to claim 1 or 2,
Wherein the support has optical isotropy. 3. The method according to claim 1 or 2,
And a buried resin layer configured to embed the support on the one surface of the polarizer. 3. The method according to claim 1 or 2,
Wherein the support has a compressive modulus at 23 DEG C of from 0.01 GPa to 8.0 GPa. An image display device comprising the polarizing film according to claim 1 or 2. A pattern of a resin material is formed on at least one surface of the polarizer,
And curing the resin material to provide a support having a patterned structure.

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