WO2017078086A1 - 偏光板及びこれを含む画像表示装置 - Google Patents
偏光板及びこれを含む画像表示装置 Download PDFInfo
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- WO2017078086A1 WO2017078086A1 PCT/JP2016/082642 JP2016082642W WO2017078086A1 WO 2017078086 A1 WO2017078086 A1 WO 2017078086A1 JP 2016082642 W JP2016082642 W JP 2016082642W WO 2017078086 A1 WO2017078086 A1 WO 2017078086A1
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- polarizer
- film
- polarizing plate
- elastic modulus
- mpa
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- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920006132 styrene block copolymer Polymers 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- QPBYLOWPSRZOFX-UHFFFAOYSA-J tin(iv) iodide Chemical compound I[Sn](I)(I)I QPBYLOWPSRZOFX-UHFFFAOYSA-J 0.000 description 1
- NLLZTRMHNHVXJJ-UHFFFAOYSA-J titanium tetraiodide Chemical compound I[Ti](I)(I)I NLLZTRMHNHVXJJ-UHFFFAOYSA-J 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
Definitions
- the present invention relates to a polarizing plate and an image display device including the same, and more particularly to a polarizing plate excellent in durability against thermal shock and an image display device including the same.
- Polarizers used in various image display devices such as liquid crystal display devices (LCD), electroluminescence (EL) display devices, plasma display devices (PDP), field emission display devices (FED), OLEDs, etc.
- a polyvinyl alcohol (PVA) film includes a polarizer in which an iodine compound or a dichroic polarizing material is adsorbed and oriented, and a polarizer protective film is sequentially laminated on one surface of the polarizer.
- the other surface of the child has a multilayer structure in which a polarizer protective film, an adhesive layer bonded to another member, and a release film are sequentially laminated.
- a polarizer constituting a polarizing plate is applied to an image display device, and is basically required to have both high transmittance and degree of polarization in order to provide an image having excellent color reproducibility.
- a polarizer was manufactured by modifying the polyvinyl alcohol film itself or using a non-sublimation dichroic dye in place of the sublimable iodine polarization element.
- a protective film is bonded to a polarizer immediately after washing and drying in the production process.
- the dried polarizer has a low physical strength, and once it is wound, there is a problem that it is easily broken in the processing direction. Therefore, usually, after drying, a water-based adhesive that is an aqueous solution of a polyvinyl alcohol resin is immediately applied to the polarizer, and the protective film is simultaneously bonded to both sides of the polarizer with this adhesive interposed.
- Such a polarizing plate can be exposed to various temperature environments such as the manufacturing process, transportation, and in-use environments, it must exhibit sufficient durability so that cracks and other defects do not occur in such an environment. I must.
- the polarizing plate is subjected to a thermal shock durability experiment in which the polarizing plate is alternately exposed to a low temperature environment and a high temperature environment after manufacturing, and such a thermal shock durability experiment is normally alternately exposed to a low temperature environment and a high temperature environment for 30 minutes each.
- a thermal shock durability experiment in which the polarizing plate is alternately exposed to a low temperature environment and a high temperature environment after manufacturing, and such a thermal shock durability experiment is normally alternately exposed to a low temperature environment and a high temperature environment for 30 minutes each.
- Such a process is defined as one cycle, and is performed in 100 cycles or more.
- This thermal shock durability experiment is an experiment under severe conditions such that cracks occur in the polarizer during the experiment in the case of a normal polarizing plate.
- Korean Patent Application No. 2015-0087062 discloses a polarizing plate that can reduce the crack length during thermal shock, but cannot provide a satisfactory alternative to the above problems.
- An object of the present invention is to provide a polarizing plate that has excellent thermal shock durability and can significantly reduce the cracks of a polarizer.
- a polarizer and a polarizer protective film bonded to at least one surface of the polarizer via an adhesive layer, and an elastic modulus coefficient represented by the following formula 1 is 13.0 to 29.0 MPa / (N / 2 mm)
- An image display device comprising the polarizing plate according to any one of 1 to 5 above.
- the polarizing plate of the present invention is remarkably excellent in thermal shock durability and has a significantly low possibility of cracking when exposed to high and low temperature environments.
- the present invention includes a polarizer and a polarizer protective film bonded to at least one surface of the polarizer via an adhesive layer, and an elastic modulus coefficient represented by a specific relational expression is 13.0 to 29.0 MPa / ( N / 2 mm), the present invention relates to a polarizing plate excellent in durability against thermal shock and an image display device including the same.
- the shrinkage force in the absorption axis direction of the polarizer, the tensile elastic modulus of the polarizer protective film, and the storage elastic modulus of the adhesive layer have the above specific relationship (elastic modulus coefficient is 13.0 to 29). Satisfying 0.0 MPa / (N / 2 mm)) reduces the occurrence of cracks even when a thermal shock is applied.
- the polarizing film shrinks when the temperature becomes high, and the contracted polarizing film expands when returning to a low temperature, and cracks are likely to occur when trying to return to the original state. For this reason, the hardness of the polarizer protective film and the adhesive layer near room temperature against stress accumulated by shrinkage at high temperature is an important characteristic in suppressing the occurrence of cracks.
- the elastic modulus coefficient according to the present invention is less than 13.0 MPa / (N / 2 mm) or more than 29.0 MPa / (N / 2 mm), the number of cases in which cracks occur in the polarizer during thermal shock is significantly increased. .
- the elastic modulus coefficient is less than 13.0 MPa / (N / 2 mm)
- the polarizer protective film and the adhesive layer are insufficiently restrained from shrinkage of the polarizer and cracks are likely to occur
- the elastic modulus coefficient is 29.0 MPa /
- it exceeds (N / 2 mm) the polarizer protective film and the adhesive layer are hard, and distortion due to the contraction of the polarizer is not alleviated, and cracks are likely to occur.
- the polarizer according to the present invention is not particularly limited as long as it has a contraction force in the absorption axis direction that satisfies the elastic modulus coefficient.
- the contraction force in the absorption axis direction is 2 when left at 80 ° C. for 1 hour. It may have a shrinkage force of 5 N / 2 mm or less. The durability against thermal shock can be further improved when the shrinkage force is 2.5 N / 2 mm or less.
- the lower limit value of the contraction force in the absorption axis direction may be 1.0 N / 2 mm or more when left at 80 ° C. for 1 hour.
- the contraction force in the absorption axis direction of the polarizer according to the present invention can be controlled by adjusting the compound used in the production of the polarizer or the stretch ratio, and is preferably performed in the crosslinking step where the largest stretching and crosslinking are performed. Can do.
- the shrinkage force in the absorption axis direction of the polarizer can be controlled by adjusting the content of boron compound in the aqueous solution for crosslinking or the stretching ratio of the crosslinking step.
- the thickness of the polarizer of the present invention may be 5 to 30 ⁇ m, preferably 10 to 28 ⁇ m, more preferably 15 to 26 ⁇ m. When the thickness of the polarizer is in the above range, both low shrinkage force in the absorption axis direction of the polarizer and handling properties can be achieved.
- the polarizer according to the present invention is manufactured from a film for forming a polarizer.
- a film for forming a polarizer for producing a polarizer is a polymer film used for producing a polarizing plate
- a film that can be dyed with a dichroic substance (for example, iodine) known in the art is not particularly limited.
- polyvinyl alcohol film partially saponified polyvinyl alcohol film; polyethylene terephthalate film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, cellulose film, partially A hydrophilic polymer film such as a saponified film, or a polyene oriented film such as a dehydrated polyvinyl alcohol film or a dehydrochlorinated polyvinyl chloride film can be used.
- a polyvinyl alcohol film is preferable because it not only has an excellent effect of enhancing the uniformity of the degree of polarization in the plane, but also has an excellent dyeing affinity for iodine.
- the method for producing a polarizer according to the present invention may include a swelling step, a dyeing step, a crosslinking step, a complementary color step, a stretching step, a water washing step and a drying step of the polarizer forming film, and can be classified according to the stretching method. .
- a dry stretching method, a wet stretching method, or a hybrid stretching method in which the above-mentioned two kinds of stretching methods are mixed can be used.
- the manufacturing method of the polarizer of this invention is demonstrated taking the wet extending
- the remaining steps except the drying step are the states in which the film for forming the polarizer is immersed in a constant temperature bath (bath) filled with one or more solutions each selected from various types of solutions. Can be done.
- the swelling step is performed by immersing the unstretched polarizer-forming film in a swelling tank filled with a swelling aqueous solution before dyeing it, and depositing impurities on the surface of the polarizer-forming film, such as impurities or antiblocking agents.
- impurities such as impurities or antiblocking agents.
- an aqueous solution for swelling known in the art can be used without particular limitation.
- water pure water, deionized water
- glycerin or potassium iodide When is added, processability can be improved along with swelling of the polymer film.
- the content of glycerin is preferably 5% by weight or less and the content of potassium iodide is preferably 10% by weight or less with respect to 100% by weight of the aqueous solution for swelling.
- the temperature of the swelling tank is not particularly limited, but may be 20 to 45 ° C, for example, 25 to 40 ° C.
- a performance time known in the art can be applied without particular limitation, and may be, for example, 180 seconds or less, preferably 90 seconds or less. .
- immersion time is in the above range, it is possible to suppress the swelling from becoming excessively saturated, and the breakage due to the softening of the polarizer forming film is prevented, and the adsorption of iodine becomes uniform in the dyeing step.
- the degree of polarization can be improved.
- the stretching step can be performed together with the swelling step.
- the stretching ratio may be about 1.1 to 3.5 times, but is not limited, and preferably 1.5 to 3.0 times. Good. If the draw ratio is less than 1.1 times, wrinkles may occur. If it exceeds 3.5 times, the initial optical characteristics may be weak.
- the dyeing step is a step of immersing the polarizer forming film in a dyeing tank filled with a dichroic substance, for example, an aqueous dyeing solution containing iodine, and adsorbing iodine to the polarizer forming film.
- a dichroic substance for example, an aqueous dyeing solution containing iodine, and adsorbing iodine to the polarizer forming film.
- an aqueous dye solution known in the art can be used without particular limitation, and it can contain water, a water-soluble organic solvent or a mixed solvent thereof and iodine.
- the iodine content may be 0.4 to 400 mmol / L in the aqueous dyeing solution, but is not limited thereto, and is preferably 0.8 to 275 mmol / L, most preferably 1 to 200 mmol / L. Also good.
- the aqueous solution for dyeing may further contain an iodide as a solubilizing agent so that the dyeing efficiency can be improved.
- an iodide known in the art can be used without limitation.
- At least one selected from the group consisting of barium iodide, calcium iodide, tin iodide, and titanium iodide can be included, and among these, potassium iodide is preferable because of its high solubility in water.
- the iodide content may be 0.01 to 10% by weight with respect to 100% by weight of water, but is not limited, and may preferably be 0.1 to 5% by weight.
- boric acid may be added to the dyeing tank in an amount of 0.3 to 5% by weight with respect to 100% by weight of water. Not. When boric acid dyeing tank is less than 0.3 wt%, PVA-I 3 - complex and PVA-I 5 - it may not be effective in increasing the complex content, boric acid dyeing tank 5 If the concentration is higher than% by weight, the risk of film breakage may increase.
- the temperature of the dyeing tank may be 5 to 42 ° C, but is not limited thereto, and may preferably be 10 to 35 ° C.
- the immersion time of the film for forming a polarizer in the dyeing tank is not particularly limited, and may be 1 to 20 minutes, preferably 2 to 10 minutes.
- the stretching step can be performed together with the dyeing step.
- the stretching ratio may be 1.01 to 2.0 times, but is not limited thereto, and preferably 1. It may be 1 to 1.8 times.
- the cumulative stretching ratio up to the dyeing step including the swelling and dyeing step may be 1.2 to 4.0 times. If the cumulative stretch ratio is less than 1.2 times, wrinkles of the film may occur and appearance defects may occur, and if it exceeds 4.0 times, the initial optical characteristics may be fragile.
- the cross-linking step is a step of fixing the adsorbed iodine molecules by immersing the dyed polarizer forming film in an aqueous solution for cross-linking so that the dyeability by physically adsorbed iodine molecules does not deteriorate due to the external environment. It is.
- iodine which is a dichroic dye
- iodine molecules may be detached by a moist heat environment, and sufficient crosslinking reaction is required. Further, in order to orient the iodine molecules located between the molecules of the polarizer-forming film and improve the optical properties, stretching at the largest stretching ratio can be performed in the crosslinking step.
- the method for producing a polarizer can perform, for example, a crosslinking step including first and second crosslinking steps, and one or more of the first and second crosslinking steps include:
- An aqueous solution for crosslinking containing a boron compound can be used. This can improve the optical properties and color durability of the polarizer.
- the aqueous solution for crosslinking an aqueous crosslinking solution known in the art can be used without particular limitation.
- the aqueous solution for crosslinking may contain water as a solvent and a boron compound such as boric acid or sodium borate. It may further contain a soluble organic solvent and iodide.
- the shrinkage force in the absorption axis direction of the polarizer can be controlled by adjusting the content of the boron compound in the aqueous solution for crosslinking. Specifically, when the content of the boron compound is increased, the contraction force in the absorption axis direction can be increased, and when the content is decreased, the contraction force in the absorption axis direction can be decreased.
- the boron compound content may be a content known in the art, and may be, for example, 1 to 10% by weight, preferably 2 to 6% by weight with respect to 100% by weight of water. Good. When the content is less than 1% by weight, the crosslinking effect of the boron compound is reduced, and it may be difficult to impart rigidity to the polarizer. When the content exceeds 10% by weight, the crosslinking reaction of the inorganic crosslinking agent is excessive. When activated, the crosslinking reaction of the organic crosslinking agent may not proceed effectively.
- iodide can be used to maintain the uniformity of the degree of polarization in the plane of the polarizer and to prevent desorption of dyed iodine.
- the iodide may be the same as that used in the dyeing step, and its content may be 0.05 to 15% by weight with respect to 100% by weight of water, but is not limited, preferably May be from 0.5 to 15% by weight. If the content is less than 0.05% by weight, iodine ions in the film may escape and increase the transmittance of the polarizer. If the content exceeds 15% by weight, iodine ions in the aqueous solution may be added to the film. It can penetrate and reduce the transmittance of the polarizer.
- the temperature of the crosslinking tank may be 20 to 70 ° C., but is not limited thereto.
- the immersion time of the film for forming a polarizer in the crosslinking tank may be 1 second to 15 minutes, but is not limited thereto, and may preferably be 5 seconds to 10 minutes.
- the stretching step may be performed at the same time in the crosslinking step, or may be stretched at the largest stretching ratio in the crosslinking step as described above, and stress relaxation is performed thereafter. It is preferable from the viewpoint of reducing the contraction force.
- the cross-linking step may include a first cross-linking step and a second cross-linking step, and the first cross-linking step may be a high stretching step, and the second cross-linking step may be a stress relaxation step.
- the draw ratio of the first crosslinking step may be 2.0 to 3.0 times, preferably 2.2 to 2.8 times.
- the stretching ratio of the second crosslinking step may be 0.85 to 1.0 times.
- the cumulative stretching ratio of the first and second crosslinking steps may be 1.5 to 3.0 times, but is not limited thereto, and preferably 1.98 to 2.8 times. Good. If the cumulative stretching ratio is less than 1.5 times, the orientation effect of iodine may be insufficient, and if it exceeds 3.0 times, the stress due to stretching may increase and the shrinkage force may increase. .
- the manufacturing method of the polarizer of this invention may further include the complementary color step as needed.
- the complementary color step the iodine complex positioned between the molecules in the polarizer-forming film on which the iodine complex is physically adsorbed can be oriented near the boric acid bridge to stabilize the iodine complex. . Further, through the complementary color step, the color can be corrected for the polarizer-forming film in which the iodine complex is not sufficiently dyed in the crosslinking step.
- the aqueous solution for complementary color in the complementary color step includes, for example, water as a solvent and a boron compound such as boric acid, and may further include an organic solvent and iodide that are mutually soluble with water.
- the boron compound imparts short crosslinks and rigidity to the polarizer, and suppresses wrinkling of the film during the process, thereby improving the handleability of the film and improving the iodine orientation of the polarizer. Can play a role to form.
- the content of the boron compound may be 1 to 10% by weight with respect to 100% by weight of water, but is not limited thereto, and may preferably be 2 to 6% by weight.
- the content is less than 1% by weight, the crosslinking effect of the boron compound is reduced, and it may be difficult to impart rigidity to the polarizer.
- the content exceeds 10% by weight, the crosslinking reaction of the inorganic crosslinking agent is excessive. When activated, the crosslinking reaction of the organic crosslinking agent may not proceed effectively.
- iodide can be used to maintain the uniformity of the degree of polarization in the plane of the polarizer and to prevent desorption of dyed iodine.
- the iodide may be the same as that used in the dyeing step, and the content may be 0.05 to 15% by weight with respect to 100% by weight of water, but is not limited thereto. Preferably, it may be 0.5 to 11% by weight. If the content is less than 0.05% by weight, iodine ions in the film may escape and increase the transmittance of the polarizer. If the content exceeds 15% by weight, iodine ions in the aqueous solution may be added to the film. It can penetrate and reduce the transmittance of the polarizer.
- the temperature of the complementary color tank may be 20 to 70 ° C.
- the immersion time of the polarizer-forming film in the complementary color tank may be 1 second to 15 minutes, but is not limited thereto, and may preferably be 5 seconds to 10 minutes.
- the stretching step can be performed together with the complementary color step.
- the stretching ratio of the complementary color step may be 1.01 to 1.25 times, but is not limited thereto, and preferably 1.05 to 1. It may be 20 times.
- the stretching ratio is less than 1.01, the stabilizing effect of the iodine complex and the orientation effect of the film for forming a polarizer may be insufficient. Film breakage may occur, and production efficiency may be reduced.
- the stretching step may be performed simultaneously with other steps as described above, or may be performed separately.
- the stretching step may be performed at least once or may be performed a plurality of times. When it is performed a plurality of times, it may be performed separately at an arbitrary step in the manufacturing process of the polarizer.
- the contraction force of the polarizer in the stretching (absorption axis) direction can be adjusted by the stretching ratio, and preferably by the stretching ratio in the crosslinking step as described above.
- the total cumulative draw ratio of the polarizer is preferably 5.0 to 7.0 times, and more preferably 5.3 to 6 times.
- the polarizer production method of the present invention is, as necessary, for immersing a film for forming a polarizer, which has been crosslinked and stretched, in a washing tank filled with an aqueous washing solution, and for forming a polarizer in steps up to the washing step.
- a water washing step may be further included to remove unwanted residues such as boric acid attached to the film.
- the aqueous washing solution may be an aqueous washing aqueous solution known in the art without particular limitation, and may be, for example, water, to which an iodide may be further added. Not.
- the temperature of the washing tank may be 10 to 60 ° C, but is not limited thereto, and may preferably be 15 to 40 ° C.
- the water washing step can be omitted, and can be performed each time a step before the water washing step such as the dyeing step or the crosslinking step is completed. Further, it may be repeated one or more times, and the number of repetitions is not particularly limited.
- the drying step is a step of drying the washed film for forming a polarizer, and further improves the orientation of dyed iodine molecules by neck-in by drying. This is a step of obtaining a polarizer having excellent optical characteristics. Neck-in means that the width of the film is narrowed.
- a drying method As a drying method, a drying method known in the art can be used in combination without limitation, and methods such as natural drying, hot air drying, air drying, heat drying, far-infrared drying, and microwave drying can be used. Recently, microwave drying in which only water in the film is activated and dried is newly used, and usually hot air drying is mainly used.
- the temperature at which the hot air drying is performed is not particularly limited, but is preferably performed at a relatively low temperature in order to prevent deterioration of the polarizer, and may be, for example, 20 to 90 ° C., preferably 80 ° C. or less. May be.
- the time for performing the hot air drying is not particularly limited, and can be performed, for example, for 1 to 10 minutes.
- the polarizer protective film according to the present invention is not particularly limited as long as it is a polarizer protective film having a tensile elastic modulus capable of satisfying the elastic modulus coefficient.
- the polarizer protective film has a tensile elastic modulus of 1000 to 4000 MPa at 25 ° C. Also good.
- the tensile elastic modulus is in the above range, durability against thermal shock can be further improved. If the tensile elastic modulus of the protective film is less than 1000 MPa, the crack failure becomes more severe due to the difference in elastic modulus between the protective film and the adhesive layer located between the polarizer, and if it exceeds 4000 MPa, the cracking phenomenon of the protective film due to external stress. Can occur.
- the tensile elastic modulus of the polarizer protective film is determined by the material of the protective film.
- the material of the polarizer protective film is not particularly limited as long as it is a film excellent in transparency, mechanical strength, thermal stability, moisture shielding property, isotropy, etc. in addition to the required tensile elastic modulus.
- Various transparent resin films containing at least one selected from the group consisting of a resin film, a cellulose resin film, a polyolefin resin film, and a polyester resin film can be used.
- the protective film include acrylic resin films such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; polyester resin films such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; Cellulose-based resin films such as diacetylcellulose, triacetylcellulose, and cellulose acetate propionate; polyolefin-based resin films such as polyethylene, polypropylene, polyolefins having a cyclo- or norbornene structure, and ethylene-propylene copolymers; However, it is not limited to these.
- the thickness of the protective film is not particularly limited, but may be 10 to 200 ⁇ m, preferably 10 to 150 ⁇ m.
- each protective film may be the same or have a different thickness.
- the adhesive layer according to the present invention is formed by curing the adhesive composition, and joins the polarizer and the protective film.
- the adhesive layer according to the present invention is not particularly limited as long as the adhesive layer has a storage elastic modulus satisfying the elastic modulus coefficient, and may have a storage elastic modulus of 1000 to 4000 MPa at 30 ° C., for example.
- the durability against thermal shock can be further improved when the storage elastic modulus is in the above range. If the storage modulus is less than 1000 MPa or exceeds 4000 MPa, cracks may occur during thermal shock. Adjustment of the storage elastic modulus of an adhesive layer can be adjusted with the kind and content of each component of an adhesive composition.
- the thickness of the adhesive layer is not particularly limited, but is preferably 0.01 to 10 ⁇ m, and more preferably 0.5 to 5 ⁇ m. When the thickness of the adhesive layer is within the above range, foreign matter is hardly visible, the adhesive composition is sufficiently cured, and the adhesion is good. The thickness of the adhesive layer can be adjusted by adjusting the coating thickness of the adhesive composition described later.
- the adhesive composition according to the present invention may be a photo-curable adhesive composition or a thermosetting adhesive composition, and is preferably a photo-curable adhesive composition in consideration of productivity.
- the photocurable adhesive composition can contain a photopolymerizable compound and a photopolymerization initiator.
- the photopolymerizable compound may be a radical photopolymerizable compound or a cationic photopolymerizable compound.
- Examples of the photoradical polymerizable compound include 1 to 6 functional monomers. Specifically, methyl (meth) acrylate, allyl methacrylate, 2-ethoxyethyl (meth) acrylate, isodecyl (meth) acrylate, 2- Dodecylthioethyl methacrylate, octyl acrylate, 2-methoxyethyl acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, isooctyl (meth) acrylate, isodexyl (meth) acrylate, stearyl (meth) ) Acrylate, glycidyl methacrylate, tetrafurfuryl (meth) acrylate, phenoxyethyl (meth) acrylate, urethane acrylate, aminoethyl (meth) acrylate
- Dimer tetrafunctional monomer such as diglycerin tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate; 5 such as propionic acid-modified dipentaerythritol penta (meth) acrylate Functional monomers; and hexafunctional monomers such as caprolactone-modified dipentaerythritol hexa (meth) acrylate.
- monofunctional to trifunctional monomers are preferable. You may use these individually or in mixture of 2 or more types.
- Examples of the photo-cationic polymerizable compound include bisphenol type epoxy resins such as bisphenol A type epoxy resin and bisphenol F type epoxy resin; novolak type epoxy resins such as phenol novolak type epoxy resin and cresol novolak type epoxy resin; aliphatic epoxy resins and fats. Cyclic epoxy resin, naphthalene type epoxy resin, polyfunctional epoxy resin, biphenyl type epoxy resin, glycidyl ether type epoxy resin, glycidyl ester type epoxy resin, glycidyl amine type epoxy resin; hydrogenated bisphenol A type epoxy resin, etc.
- Alcohol-type epoxy resins Halogenated epoxy resins such as brominated epoxy resins; Rubber-modified urethane resins, urethane-modified epoxy resins, epoxidized polybutadiene, epoxidized styrene-butane
- Epoxy group-containing compounds such as ene-styrene block copolymer, epoxy group-containing polyester resin, epoxy group-containing polyurethane resin, epoxy group-containing acrylic resin; phenoxymethyl oxetane, 3,3-bis (methoxymethyl) oxetane, 3,3 -Bis (phenoxymethyl) oxetane, 3-ethyl-3- (phenoxymethyl) oxetane, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, 3-ethyl-3- ⁇ [3- (triethoxysilyl)
- Examples include oxetanyl group-containing compounds such as propoxy
- the photopolymerization initiator is for improving the efficiency of the curing reaction, and is a radical photopolymerization initiator such as acetophenone, benzophenone, thioxanthone, benzoin, benzoin alkyl ether; aromatic diazonium salt, aromatic Examples include sulfonium salts, aromatic iodine aluminum salts, and benzoin sulfonic acid esters.
- cationic photopolymerization initiator commercially available products such as Optomer-SP-151, Optomer-SP-170, Optomer-SP-171 (Asahi Denka Kogyo Co., Ltd.), Irgacure-261 (Ciba Co., Ltd.) SI-60L, UVI-6990 (Union Carbide), BBI-1C3, MPI-103, TPS-103, DTS-103, NAT-103, NDS-103 (Midori Chemical Co.), CPI-110A (San Apro) Can also be mentioned. You may use these individually or in mixture of 2 or more types.
- the content of the photopolymerization initiator is not particularly limited, and for example, it can be contained in 0.5 to 10 parts by weight with respect to 100 parts by weight of the photopolymerizable compound. When the content is within the above range, it has an appropriate curing rate and has excellent durability.
- the polarizing plate can be produced by bonding a polarizer and a polarizer protective film using the adhesive composition. Bonding of the polarizer and the protective film using the adhesive composition can be performed by an appropriate method, for example, casting method, Mayer bar coating method, gravure coating method, spin coating method, die coating method, dip coating method. And a method of applying the adhesive composition on the adhesive surface of the polarizer and / or the protective film by a spraying method and superimposing the two.
- the casting method is a method in which an adhesive composition is applied to the surface of an object to be coated while moving a polarizer or a protective film to be coated in a substantially vertical direction, a substantially horizontal direction, or an oblique direction therebetween. .
- the coating thickness of the adhesive composition is not particularly limited, and can be applied, for example, from 0.01 to 10 ⁇ m, preferably from 0.5 to 5 ⁇ m.
- the polarizer and the protective film are sandwiched by nip rolls and bonded.
- surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame treatment, and saponification treatment may be appropriately performed on the surface of the polarizer and / or protective film as necessary.
- saponification treatment include a method of immersing in an aqueous solution of an alkali such as sodium hydroxide or potassium hydroxide.
- the drying process is performed, for example, by spraying hot air, and the temperature at that time is appropriately selected in the range of 50 to 100 degrees.
- the drying time is usually 30 to 1,000 seconds.
- the polarizing plate according to the present invention is applicable not only to a normal liquid crystal display device but also to various image display devices such as an organic electroluminescence display device (OLED), a plasma display device, and a field emission display device.
- OLED organic electroluminescence display device
- plasma display device a plasma display device
- field emission display device a field emission display device
- ⁇ Adhesive composition> A photocurable resin containing 47 parts by weight of phenoxyglycidyl ether, 50 parts by weight of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, and 3 parts by weight of a photopolymerization initiator (CPI-110A, San Apro). A composition was prepared. The storage elastic modulus of the adhesive composition after curing is 1500 MPa.
- ⁇ Polarizer> After a transparent unstretched polyvinyl alcohol film (PE60, KURARAY) having a saponification degree of 99.9% or more was immersed in water (deionized water) at 25 ° C. for 1 minute and 20 seconds to swell (swelling step) Dyeing by immersing in an aqueous dyeing solution at 30 ° C. containing 1.25% by weight of potassium iodide and 0.3% by weight of boric acid for 1.25 mM / L of iodine and 100% by weight of water for 2 minutes and 30 seconds (Staining step). At this time, in the swelling and dyeing steps, the film was stretched at a stretching ratio of 1.7184 times and 1.5214 times, respectively, so that the cumulative stretching ratio up to the dyeing tank was 2.614 times.
- PE60 transparent unstretched polyvinyl alcohol film having a saponification degree of 99.9% or more was immersed in water (deionized water) at 25 ° C. for
- the film was stretched 1.08 times while immersed in an aqueous solution for complementary color at 40 ° C. containing 5% by weight of potassium iodide and 2% by weight of boric acid with respect to 100% by weight of water (complementary color step).
- the total cumulative draw ratio of the swelling, dyeing, crosslinking, and complementary color steps was set to 6 times.
- the polyvinyl alcohol film was washed with deionized water (water washing step) and then dried in an oven at 80 ° C. for 5 minutes (drying step) to produce a polarizer having a transmittance of 42.5%.
- the thickness of the polarizer was 23 ⁇ m.
- ⁇ Polarizing plate> The adhesive composition is applied on a 60 ⁇ m-thick triacetyl cellulose film (Fuji Film) having a tensile elastic modulus of 3900 MPa, and the adhesive composition is applied to one side of a polarizer on which iodine is adsorbed and oriented. After a polarizer and a triacetyl cellulose film are sandwiched with a nip roll so that the thickness of the object becomes 2 to 3 ⁇ m, UV curing is performed with a high-pressure mercury lamp (UVA accumulated light amount 500 mJ / cm 2 ). A polarizing plate was manufactured by bonding an adhesive.
- UVA accumulated light amount 500 mJ / cm 2 A polarizing plate was manufactured by bonding an adhesive.
- Examples 2 to 7 and Comparative Examples 1 to 3> As described in Table 1 below, a polarizing plate was produced in the same manner as in Example 1 except that the elastic modulus of the protective film and the adhesive layer and the shrinkage force in the absorption axis direction of the polarizer were adjusted. did.
- the elastic modulus of the protective film is a value measured for each product.
- Example 5 the elastic modulus of the adhesive layer was changed to 4 parts by weight of the photopolymerization initiator (CPI-110A, Sun Apro) of Example 1, and in Example 6, the photopolymerization initiator (CPI--) of Example 1 was changed. 110A, San Apro) was adjusted to 5 parts by weight.
- the shrinkage force in the absorption axis direction of the polarizer was adjusted by changing the boric acid content of the aqueous solution for crosslinking.
- the boric acid content in Table 1 means the boric acid content of the aqueous solution for crosslinking in the first crosslinking step and the second crosslinking step.
- the adhesive composition was applied to the surface of one of two cycloolefin polymer (COP) films (Zeon Co.) not subjected to corona treatment to a thickness of 10 ⁇ m by bar coating. Then, another COP film not subjected to corona treatment is bonded to the surface coated with the adhesive composition using a laminator, and UV curing is performed with a high-pressure mercury lamp (UVA integrated light quantity is 500 mJ / cm 2 ). And an adhesive film having a thickness of 4 ⁇ m was prepared.
- COP cycloolefin polymer
- the adhesive film was peeled off from the COP film and cut to a size of 5.0 cm ⁇ 0.5 cm, and then the storage elastic modulus at 30 ° C. was measured with DMA Q800 (Dynamic mechanical analyzer, TA) (temperature conditions were Normal temperature to 200 ° C).
- DMA Q800 Dynamic mechanical analyzer, TA
- temperature conditions were Normal temperature to 200 ° C.
- the polarizing plates produced in the examples and comparative examples were cut to a size of 15.0 cm (absorption axis (MD) direction) ⁇ 11 cm (transmission axis (TD) direction), and then bonded to a glass plate using an adhesive. Then, an autoclave (50 ° C., 20 minutes, 5 atm) treatment was performed. After standing for 24 hours, a thermal shock test was performed (-40 ° C, 30 minutes and 85 ° C, 30 minutes, 60 minutes in one cycle). After the sample produced in the oven was put in and 100 cycles were completed, the presence or absence of cracks in the polarizer was confirmed (5 samples were prepared for each example or comparative example).
- the polarizing plate satisfying the elastic modulus coefficient range of the present invention does not generate any cracks in the polarizer even during thermal shock.
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Abstract
Description
[数式1]
弾性率係数={(A+B)/C}/100
(式中、Aは偏光子保護フィルムの25℃引張弾性率(MPa)であり、Bは接着層の30℃貯蔵弾性率(MPa)であり、Cは80℃で1時間静置された偏光子の吸収軸方向の収縮力(N/2mm)である)。
[数式1]
弾性率係数={(A+B)/C}/100
(式中、Aは偏光子保護フィルムの25℃引張弾性率(MPa)であり、Bは接着層の30℃貯蔵弾性率(MPa)であり、Cは80℃で1時間静置された偏光子の吸収軸方向の収縮力(N/2mm)である)
本発明による偏光子は、前記弾性率係数を満足できる吸収軸方向の収縮力を有する偏光子であれば特に制限されず、例えば80℃で1時間静置時に吸収軸方向の収縮力が、2.5N/2mm以下の収縮力を有するものであってもよい。2.5N/2mm以下の収縮力を有する場合に熱衝撃に対する耐久性が一層改善され得る。また、吸収軸方向の収縮力の下限値は、80℃で1時間静置時に1.0N/2mm以上であってもよい。
膨潤ステップは、未延伸の偏光子形成用フィルムを染色する前に膨潤用水溶液で満たされた膨潤槽に浸漬し、偏光子形成用フィルムの表面上に堆積したほこりまたはブロッキング防止剤のような不純物を取り除き、偏光子形成用フィルムを膨潤させる、延伸効率を向上させ、染色不均一性を防止し、偏光子の物性を向上させるためのステップである。
染色ステップは、偏光子形成用フィルムを二色性物質、例えばヨウ素を含む染色用水溶液で満たされた染色槽に浸漬させ、偏光子形成用フィルムにヨウ素を吸着させるステップである。
架橋ステップは、物理的に吸着されているヨウ素分子による染色性が外部環境によって低下しないように、染色された偏光子形成用フィルムを架橋用水溶液に浸漬させ、吸着されたヨウ素分子を固定させるステップである。
本発明の偏光子の製造方法は、必要に応じて補色ステップをさらに含んでいてもよい。補色ステップを通じて、ヨウ素錯体が物理的に吸着されている偏光子形成用フィルムにおける分子と分子との間に位置するヨウ素錯体をホウ酸架橋の近くに配向させてヨウ素錯体を安定化させることができる。また、補色ステップを通じて、前記架橋ステップにおけるヨウ素錯体の染色が不十分な偏光子形成用フィルムに対して、色を補正することができる。
本発明において、延伸ステップは前述したように他の工程と同時に行われてもよく、別途に行われてもよい。延伸ステップは少なくとも1回行われてもよく、複数回で行われてもよい。複数回行われる場合には偏光子の製造工程中の任意のステップで分けて行われてもよい。
本発明の偏光子の製造方法は必要に応じて、架橋及び延伸が完了した偏光子形成用フィルムを、水洗用水溶液で満たされた水洗槽に浸漬させ、水洗ステップまでのステップで偏光子形成用フィルムに付着した、ホウ酸のような不要な残留物を取り除く水洗ステップをさらに含んでいてもよい。
本発明の製造方法において、乾燥ステップは、水洗された偏光子形成用フィルムを乾燥させるステップであって、乾燥によるネックイン(neck-in)で、染着されたヨウ素分子の配向をより向上させ、光学特性に優れた偏光子を得るステップである。なお、ネックインとは、フィルムの幅が狭くなることである。
本発明による偏光子保護フィルムは、前記弾性率係数を満足できる引張弾性率を有する偏光子保護フィルムであれば特に制限されず、例えば25℃で1000乃至4000MPaの引張弾性率を有するものであってもよい。上記の範囲の引張弾性率を有する場合に熱衝撃に対する耐久性が一層改善され得る。保護フィルムの引張弾性率が1000MPa未満であれば保護フィルムと偏光子との間に位置する接着層との弾性率差によって亀裂不良がよりひどくなり、4000MPaを超えると外部ストレスにより保護フィルムの割れ現象が発生し得る。
本発明による接着層は接着剤組成物を硬化して形成され、偏光子と保護フィルムを接合させる。
偏光板の製造は、偏光子と偏光子保護フィルムとを前記接着剤組成物を用いて接合することにより行うことができる。接着剤組成物を用いた偏光子と保護フィルムとの接合は適切な方法で行うことができ、例えば流延法、マイヤーバーコーティング法、グラビアコーティング法、スピンコーティング法、ダイコーティング法、浸漬コーティング法、噴霧法などによって偏光子及び/または保護フィルムの接着面に接着剤組成物を塗布し、両者を重畳させる方法が挙げられる。流延法とは、被塗布物である偏光子または保護フィルムを概ね垂直な方向、概ね水平方向、または両者間の斜め方向に移動させながら、その表面に接着剤組成物を塗布する方法である。
<接着剤組成物>
フェノキシグリシジルエーテル47重量部、3,4-エポキシシクロヘキシルメチル-3,4-エポキシシクロヘキサンカルボキシレート50重量部、光重合開始剤(CPI-110A、サンアプロ社)3重量部を配合して光硬化性樹脂組成物を製造した。本接着剤組成物の硬化後の貯蔵弾性率は1500MPaである。
鹸化度が99.9%以上である透明な未延伸のポリビニルアルコールフィルム(PE60、KURARAY社)を25℃の水(脱イオン水)で1分20秒間浸漬して膨潤させた(膨潤ステップ)後、ヨウ素1.25mM/Lと水100重量%に対してヨウ化カリウム1.25重量%、ホウ酸0.3重量%が含有された30℃の染色用水溶液に2分30秒間浸漬して染色した(染色ステップ)。このとき、膨潤及び染色ステップで、それぞれ1.7184倍、1.5214倍の延伸比で延伸して、染色槽までの累積延伸比が2.614倍になるように延伸した。
引張弾性率が3900MPaのコロナ処理された厚み60μmのトリアセチルセルロース系フィルム(富士フイルム社)上に上記接着剤組成物を塗布し、上記ヨウ素が吸着配向された偏光子の片面に上記接着剤組成物の厚みが2乃至3μmになるように、ニップロールを用いて偏光子とトリアセチルセルロース系フィルムを挟んで接合させてから、高圧水銀ランプ(UVA積算光量500mJ/cm2)でUV硬化させた後、粘着剤を接合して偏光板を製造した。
下記の表1に記載されたように、保護フィルム及び接着層の弾性率及び偏光子の吸収軸方向の収縮力を調節したことを除いては、実施例1と同様の方法で偏光板を製造した。
保護フィルムの弾性率は製品毎に測定された値である。
上記の実施例及び比較例において製造された偏光子及び偏光板の物性を下記の方法で測定した。
保護フィルムを25mm×100mmのサイズに切断した後、標点距離を50mmとし、引張試験機(引張試験機、Shimadzu社)で長手方向引張試験を実施し、S-S curve初期曲線の接線方向に対して強度を測定し、引張弾性率を、強度値を断面積で割ることにより求めた。このとき、25℃、4mm/minの速度で測定をおこなった。
コロナ処理されていないシクロオレフィンポリマー(COP)フィルム(ゼオン社)2枚のうちの1枚の表面に接着剤組成物を10μmの厚みにバーコーティングで塗工した。その後、ラミネータを用いて接着剤組成物がコーティングされている面にもう1枚のコロナ処理されていないCOPフィルムを接合して、高圧水銀ランプ(UVA積算光量が500mJ/cm2)でUV硬化を行い、厚さ4μmの接着剤フィルムを作成した。
その後、接着剤フィルムをCOPフィルムから剥離して5.0cm×0.5cmのサイズに切断した後、DMA Q800(Dynamic mechanical analyzer、TA社)で30℃の貯蔵弾性率を測定した(温度条件は常温から200℃)。このとき、測定前に偏光子を平坦な状態に維持するために最小限の荷重を偏光子の厚み方向にかけて測定した。
ここでは、偏光子の透過軸方向の幅2mmあたりの、吸収軸方向の収縮力を測定した。実施例及び比較例において製造された偏光子を2mm(透過軸方向)×50mm(吸収軸方向)のサイズに切断した後、標点距離を15mmとし、80℃で1時間等温状態のまま静置し、DMA Q800(Dynamic mechanical analyzer、TA社)で長手方向(吸収軸方向)の収縮力を測定した。このとき、測定前に偏光子を平坦な状態に維持するために最小限の荷重を偏光子の厚み方向にかけて測定した。
実施例及び比較例において製造された偏光板を15.0cm(吸収軸(MD)方向)×11cm(透過軸(TD)方向)のサイズに切断した後、粘着剤を用いてガラス板に接合して、オートクレーブ(50℃、20分、5気圧)処理を行った。24時間放置後、熱衝撃試験を行なった(-40℃、30分及び85℃、30分、60分を1サイクル)。オーブンに製造されたサンプルを投入して100サイクルを完了した後、偏光子のクラック発生の有無を確認した(サンプル数は各実施例または比較例毎に5個準備した)。
Claims (6)
- 偏光子及び前記偏光子の少なくとも一面に接着層を介して接着された偏光子保護フィルムを含み、下記の数式1で表される弾性率係数が13.0乃至29.0MPa/(N/2mm)である偏光板:
[数式1]
弾性率係数={(A+B)/C}/100
(式中、Aは偏光子保護フィルムの25℃引張弾性率(MPa)であり、Bは接着層の30℃貯蔵弾性率(MPa)であり、Cは80℃で1時間静置された偏光子の吸収軸方向の収縮力(N/2mm)である)。 - 前記Aは1000乃至4000MPaである、請求項1に記載の偏光板。
- 前記Bは1000乃至4000MPaである、請求項1又は2に記載の偏光板。
- 前記Cは1.0乃至2.5N/2mmである、請求項1~3のいずれか一項に記載の偏光板。
- 前記接着層は光ラジカル重合性接着剤組成物または光カチオン重合性接着剤組成物で形成されたものである、請求項1~4のいずれか一項に記載の偏光板。
- 請求項1~5のいずれか一項に記載の偏光板を含む画像表示装置。
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CN113613880A (zh) * | 2019-03-26 | 2021-11-05 | 住友化学株式会社 | 层叠体和显示装置 |
CN113631363A (zh) * | 2019-03-26 | 2021-11-09 | 住友化学株式会社 | 层叠体和显示装置 |
JP7199584B1 (ja) | 2022-03-31 | 2023-01-05 | 住友化学株式会社 | 偏光板 |
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- 2016-11-02 WO PCT/JP2016/082642 patent/WO2017078086A1/ja active Application Filing
- 2016-11-02 CN CN201680062541.4A patent/CN108351454B/zh active Active
- 2016-11-04 TW TW105135894A patent/TWI705270B/zh active
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2021
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Also Published As
Publication number | Publication date |
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TWI705270B (zh) | 2020-09-21 |
JP2022017232A (ja) | 2022-01-25 |
CN108351454B (zh) | 2020-11-03 |
KR20170053039A (ko) | 2017-05-15 |
JP2023133375A (ja) | 2023-09-22 |
CN108351454A (zh) | 2018-07-31 |
KR20180065027A (ko) | 2018-06-15 |
TW201727284A (zh) | 2017-08-01 |
JPWO2017078086A1 (ja) | 2018-08-23 |
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