TW200935102A - Polarizer and liquid display device using the polarizer - Google Patents

Abstract

This invention provides a polarizer made of a polarizing film comprising a polyvinyl alcoholic resin, and a stretched polyethylene terephthalate film laminated on one side of the polarizing film via an adhesive layer, the maximum value of skewness of the orientation principal axis of the stretched polyethylene terephthalate film is 10 degree or less, the MOR value tested by a microwave transmission molecular orientation meter is 1. 5 or more. This invention also provides a liquid crystal display device having a liquid crystal panel constituted by adhering to a liquid crystal cell a polarizer of this invention which further has an adhesive layer on the outer surface opposite to the side laminated with a stretched polyethylene terephthalate film of the polarizing film via the adhesive layer.

Description

200935102 VI. Description of the Invention: [Technical Field] The present invention relates to a polarizing film having an extended polyethylene terephthalate film laminated on one side of a polarizing film composed of a polyvinyl alcohol resin via an adhesive layer A board, and a liquid crystal display device using the polarizing plate. [Prior Art] The polarizing plate is usually formed on one side or both sides of a polarizing film which is adsorbed with a dichroic dye and oriented by a polyvinyl alcohol resin, and is laminated with a protective film (for example, three-layer The composition of the cellulose acetate protective film represented by cellulose. The polarizing plate having such a laminated structure is bonded to the liquid crystal cell by an adhesive as needed through another optical film, and becomes a component of the liquid crystal display device. The use of a liquid crystal display device as a thin display device such as a liquid crystal television, a liquid crystal screen, or a personal computer is rapidly expanding. In particular, the market for LCD TVs has expanded significantly, and the requirements for cost reduction are also very high. A polarizing plate for a liquid crystal television is usually formed by a water-based adhesive layer of a triacetyl cellulose film (TAC film) on both sides of a polarizing film composed of a polyvinyl alcohol resin which is adsorbed with a two-color pigment and oriented. A retardation film is laminated on the outer surface of one side of the polarizing plate via an adhesive. The retardation film laminated on the polarizing plate is generally an extended processed product of a polycarbonate resin film or an extended processed product of a cycloolefin resin film, but in the case of liquid crystal television, the phase difference is uneven at a high temperature. Very few retardation films composed of a film of a cycloolefin resin. Such a laminate of a polarizing plate and a retardation film composed of a cycloolefin resin film is considered to reduce the number of components formed or to simplify the manufacturing process in order to improve productivity and reduce product cost. For example: in Japan Japanese Laid-Open Patent Publication No. Hei 8-43812 (Patent Document 1) discloses a laminated structure of a cycloolefin (norbornene) resin film/polarized film/TAC film having a phase difference function. Further, it is disclosed in Japanese Laid-Open Patent Publication No. 2005-70140 (Patent Document 2), JP-A-2005-181817 (Patent Document 3), and JP-A-2005-208456 (Patent Document 4) The water-based adhesive is a polarizing film composed of a polyvinyl alcohol resin and a cycloolefin film. [Explanation of the Invention] (Problems to be Solved by the Invention) In the use of a large-screen liquid crystal television, the thinning of the wall-mounted television is becoming more and more important. In this case, the following points are a problem for the components used for the liquid crystal panel. (1) The strength of the panel must be strengthened in response to the thin and large surface of the liquid crystal panel. (2) In order to reduce the thinness of the LCD TV, the components used need to be thinned. (3) The shape of the circle and the Newton ring caused by the contact between the liquid panel and the moonlight system due to the narrowing of the gap between the backlight of the liquid crystal panel and the back surface must be prevented. In order to solve the above problems, it is considered to use a polyethylene terephthalate film which is excellent in mechanical strength and cost on a film as a polarizing plate. Use the vine membrane. However, if the extended poly(ethylene phthalate) is used as a protective ruthenium, it is obvious that when the image is disposed on the liquid crystal display device, the color is 320833 4 200935102 (also called interference spot, rainbow spot). There is a problem of poor identification. The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a polarizing plate which has a high mechanical strength and can strengthen the strength of a liquid crystal panel and can reduce warpage of a liquid crystal panel, and a liquid crystal using the polarizing plate. The display device provides a liquid crystal display device in which the stain is also suppressed and the visibility is excellent when viewed obliquely. (Means for Solving the Problem) In order to solve such a problem, the inventors of the present invention have made efforts to carry out research. As a result, it has been found that one side of a polarizing film composed of a polyvinyl alcohol-based resin has a specific physical property extending layer via an adhesive layer. The polarizing plate of the ethylene terephthalate film can obtain a polarizing plate which is thin but has high mechanical strength and excellent visibility, and has completed the present invention. In other words, the present invention is as follows. The polarizing plate of the present invention is characterized in that it comprises a polarizing film composed of a polyvinyl alcohol resin and a film of a polyethylene terephthalate film laminated on one side of the polarizing film via an adhesive layer, with respect to 5以上。 The M0R value measured by a microwave penetration type molecular directionality meter is 1.5 or more. The polarizing plate of the present invention preferably has a protective film or an optical compensation film which is laminated on the side opposite to the side of the polyethylene terephthalate film which is laminated with the polarizing film. The polarizing plate of the present invention is preferably further provided with an adhesive layer on the opposite side of the side of the stretched polyethylene terephthalate film on which the polarizing film is laminated. Further, the present invention also provides a liquid crystal display device. A liquid crystal panel in which the polarizing plate of the present invention having the adhesive layer is bonded to the liquid crystal cell via an adhesive layer is provided. (Effect of the Invention) The polarizing plate of the present invention can achieve a liquid crystal display device which improves the mechanical strength, thinning, and prevention of deflection of the liquid crystal panel used, and uses the polarizing plate of the present invention, resulting from the extended poly pair The color difference caused by the phase difference of the ethylene phthalate film is also suppressed, and is suitable for use in a liquid crystal display device for large-screen liquid crystal televisions, and is particularly suitable for use in a liquid crystal display device for liquid crystal televisions. [Embodiment] The polarizing film used in the polarizing plate of the present invention is specifically obtained by adsorbing a dichroic dye to a uniaxially stretched polyvinyl alcohol resin film and orienting it. The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin. The polyvinyl acetate resin may be a copolymer of vinyl acetate and another monomer copolymerizable therewith, in addition to polyvinyl acetate of a vinyl acetate homopolymer, and examples thereof include an ethylene-vinyl acetate copolymer. The other monomer copolymerizable with the vinyl acetate may, for example, be an unsaturated carboxylic acid, an olefin, a vinyl ether, an unsaturated sulfonic acid or an acrylamide having an ammonium group. The degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, and preferably 98 mol% or more. These polyvinyl alcohol resins may also be modified, and for example, aldehyde-modified polyethylene formal, polyethylene acetal, polyvinyl butyral or the like may be used. In addition, the degree of polymerization of the polyvinyl alcohol resin is usually 6 320833 200935102 ', preferably from 1000 to 10000 to pq n. The film made of the polyvinyl alcohol tree was used as a polarizing film within a range of 15 Å to _. The polyvinyl alcohol 榭 ^ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The film thickness of the film of the polyvinyl alcohol resin is not particularly limited. For example, 1 〇 50 50 « ί Ο 偏 偏 偏 偏 偏 偏 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 通常 偏 偏 通常 通常 通常 通常 通常 通常 通常Step of dichroic dye adsorption = color treatment step), a step of treating a polyethylene glycol resin film having a dichroic dye adsorbed thereto by an aqueous acid-depleting solution (a meal (4)), and then, after being treated with an aqueous acid solution, washed with water Step (washing step). Further, in the production of the polarizing film, the polyvinyl alcohol resin film is usually subjected to uniaxial stretching, which may be carried out before the dyeing treatment step, or in the dyeing treatment step or after the dyeing treatment step. When uniaxial stretching is performed after the dyeing treatment step, the uniaxial stretching may be performed before the boric acid treatment step or in the boric acid treatment step. Of course, uniaxial stretching can also be performed at these multiple stages. The uniaxial extension can be carried out as a uniaxial extension between rolls of different peripheral speeds, or it can be carried out by means of a heat-producing uniaxial extension. Further, it may be a dry extension in which it is extended in the atmosphere, or may be extended in a state where it is expanded by using a solvent. The stretching ratio is usually about 3 to δ times. In the dyeing treatment step, the polyacetal resin film is dyed by a dichroic dye, for example, by immersing the polyethylene glycol resin film in an aqueous solution containing a dichroic dye. As the dichroic dye, iodine or a two-color 320833 7 200935102 dye can be used. The dichroic dye contains, for example, a dichroic direct dye composed of a disazo compound such as C.I. DIRECT RED 39; a dichroic direct dye composed of a compound such as a trisazo dye or a tetrazo dye. Further, it is preferred that the polyvinyl alcohol resin film is pretreated to be impregnated with water before the dyeing treatment. When iodine is used as the dichroic dye, a method of dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually employed. The content of iodine in the aqueous solution is usually from 0.01 to 1 part by weight per 100 parts by weight of water, and the content of potassium iodide is usually from 0.5 to 20 parts by weight per 100 parts by weight of water. When iodine is used as the dichroic dye, the temperature of the aqueous solution used for dyeing is usually 20 to 40 ° C, and in addition, the time (dyeing time) of impregnation in the aqueous solution is usually 20 to 1800 seconds. On the other hand, when a dichroic dye is used as the dichroic dye, a method of dyeing a polyvinyl alcohol resin film in an aqueous solution containing a water-soluble dichroic dye is usually used. The content of the dichroic dye in the aqueous solution is usually 1χ1 (Γ4 to 10 parts by weight per 100 parts by weight of water, and preferably 1×10 3 to 1 part by weight, and 1χ1 (Γ3 to lx10-2 parts by weight). The aqueous solution may also contain an inorganic salt such as sodium sulfate as a dyeing aid. When a dichroic dye is used as the dichroic dye, the temperature of the aqueous solution of the dyed dichroic dye is usually 20 to 80 ° C. Further, the time (dyeing time) of immersing in the aqueous solution is usually 10 to 1800 seconds. The boric acid treatment step is performed by impregnating a polyvinyl alcohol resin film dyed with a dichroic dye in an aqueous solution containing boric acid. δ 320833 containing boric acid 200935102 The amount of shed acid in the aqueous solution is usually 2 to 15 parts by weight per 100 parts by weight, and preferably 5 to 12 parts by weight. When iodine is used as the dyeing treatment step described above 1至15。 The amount of potassium iodide in an aqueous solution containing boric acid, the water is usually 0.1 to 15 per 100 parts by weight of the aqueous solution of boric acid. Parts by weight, and It is preferably 5 to 12 parts by weight. The time of impregnation in an aqueous solution containing boric acid is usually 60 to 1200 seconds, preferably 150 to 600 seconds, more preferably 200 to 400 seconds. 温度 Temperature of an aqueous solution containing boric acid It is usually 50 ° C or more, preferably 50 to 85 t, and preferably 60 to 80 ° C. In the subsequent water washing treatment step, the above-mentioned boric acid-treated polyvinyl alcohol resin film is, for example, impregnated. The water is usually subjected to a water washing treatment at a temperature of 5 to 40 ° C, and the impregnation time is usually 1 to 120 seconds. After the water washing treatment, a drying treatment is usually applied to obtain a polarizing film. Hot air dryer, far infrared heater, etc. The drying treatment temperature is usually 30 to 100 ° C, and preferably 50 to 80 ° C. The drying treatment time is usually 60 to 600 seconds, and 120 to 600 seconds is preferred. Thus, the polyvinyl alcohol resin film is subjected to uniaxial stretching, dyeing with a dichroic dye, boric acid treatment, and water washing treatment to obtain a polarizing film. The thickness of the polarizing film is usually 5 to 40#. Within the range of m. The polarized light of the present invention A structure in which a polyethylene terephthalate film having a specific physical property is laminated on one side of such a polarizing film and laminated with an adhesive. 9 320833 200935102 Extended polyterephthalic acid used in the present invention The film of ethylene vinegar is a film having excellent mechanical properties, such as solvent, residue, cost, etc., and the polarizing plate of the present invention obtained by using such an extended polypyrene bromide (four) film It is excellent, and it is possible to reduce the thickness. Further, whether or not the film of the poly(p-dibenzoate) in the polarizing plate is confirmed by the retardation value in the film surface. Here, the term "polyethylene terephthalate" means a resin composed of 80% by mole or more of a repeating unit composed of ethylene glycol diacetate. Other copolymerization components may, for example, be isophthalic acid, p-mono-(tetra)ethoxybenzoic acid, 4,4-dicarboxydiphenyl, 4,4,-dicarboxybenzophenone, bis(4-carboxyl) Styrene) dicarboxylic acid components such as ethane, adipic acid, sebacic acid, sodium 5-sulfoisophthalate, mono-dicarboxycyclohexane, such as propylene glycol, butanediol, neopentyl glycol, diethyl A diol component such as a diol, cyclohexanediol, a cyclohexane adduct of bisphenol A, polyethylene glycol, polypropylene glycol, or polytetramethylene glycol. These dicarboxylic acid components and a drunk component can be used in combination of two or more kinds as needed. Further, the above dicarboxylic acid component and diol component may be used in combination with a hydroxycarboxylic acid such as p-hydroxybenzoic acid. Such other copolymerization component may also contain a dicarboxylic acid component and/or a sterol component containing a small amount of a chiral amine bond, an amine ester bond, an ether bond, a carbonate bond or the like. The method for producing polyethylene terephthalate can be used to make the reaction of stupid and ethylene glycol (and, if necessary, with other dicarboxylic acids and/or other _, Any manufacturing method such as a transesterification reaction in which a dicarboxylic acid dimethyl vinegar-: ethanol (and optionally a dimethyl ester of a dicarboxylic acid component β 曰 long/or other 320833 10 200935102 diol) is transesterified. In addition, polyethylene terephthalate may also contain conventional additives as needed. However, since transparency is required for optical use, the amount of additives added is preferably limited to a minimum amount. Conventional additives may be exemplified. Such as lubricants, anti-adhesive agents 'thermal stabilizers, antioxidants, antistatic agents, light stabilizers, impact modifiers, etc. Light stabilizers also include UV absorbers, such as: Examples of UV absorbers can be, for example, 2, 2 , _ methylene bis[4-(1,1,3,3-tetramethylbutyl)_6-(211_ benzotriazol-2-yl)1 bis(Phenol), 2-(5 -methyl-2-hydroxyphenyl)_2H_benzotriazole, hydroxy-3,5-bis(α,dimethylbenzyl Phenyl]_2H_benzotriazole, 2-(3,5-di(tributyl)_2-hydroxyphenyl)_2{1_benzotriazole, 2-tributyl-5-methyl -2-hydroxyphenyl)_5_chloro-2H_benzotriazole, 2-(3,5-di(tributyl)_2-hydroxyphenyl)_5_chloro_2{1_stupidazole , 2-(3,5-di(tris-pentyl)_2-hydroxyphenyl)-indole_benzotriazole, 2_(2, mono-amino-5-dioctylphenyl)_2H_benzotriene Benzotriazole and other benzotriazole-based UV-ray absorption agents; such as 2-pyridyl-4-methoxydibenzophenone, 2_record_4-octyloxy, a formazan 2, 4-aminopyridyl Benzene, 2-hydroxy-4-methoxy-4, monochlorobenzophenone, 2, 2,-dihydroxy-4-methoxybenzophenone, 2, 2, _dihydroxy-4 , 2'-dimethoxybenzophenone and other 2-hydroxybenzophenone-based ultraviolet light absorbers; salicylic acid to tertiary butyl benzene vinegar, salicylic acid, octyl styrene, etc. The ester-based ultraviolet absorber or the like may be contained in two or more kinds as needed. When the ultraviolet absorber is contained, the amount thereof is usually 0.1% by weight or more, preferably 0.3% by weight or more, more preferably 2% by weight or less. The extended polyethylene terephthalate film used in the present invention can be 320833

II 200935102 ' (4) The raw material resin as described above is formed into a thin crucible shape and subjected to elongation treatment ❿*. By applying the stretching treatment in this manner, the mechanical strength of the polyethylene terephthalate film can be improved. The method for producing the polyethylene terephthalate film which is extended may be any method, and is not particularly limited. For example, after the raw material resin is melted and extruded into a sheet shape, the obtained non-oriented sheet is obtained. After mechanically extending at a temperature above the glass transition temperature of the polyethylene terephthalate film, a heat setting treatment is applied. Further, the stretching treatment for the polyethylene terephthalate film may be either uniaxial stretching or biaxial stretching. _ 温度 The temperature at the time of stretching is not particularly limited as long as it is a temperature higher than the glass transition temperature of the polyethylene terephthalate film. It is preferably in the range of 8 Torr to 13 ° C and preferably in the range of 90 to 120 ° C. 5倍优选。 Preferably, the stretch ratio of the polyethylene terephthalate film of the present invention, the film of the long side direction, the width direction of the film is preferably from i to 6 times, preferably from 3 to 6.5 times. . At this point, when the stretching ratio is less than 1. 1 times, the extended polyethylene terephthalate film has a tendency to exhibit insufficient transparency. Further, from the viewpoint of lowering the deflection of the oriented polyethylene terephthalate film in the orientation main axis (offset with respect to the extension axis), after performing the above extension and before performing the heat setting treatment, It is preferable that the film is subjected to relaxation treatment in the direction of the long side (the direction in which the film is moved) and the direction of the width of the film (the direction perpendicular to the direction in which the film is moved). The temperature at which the relaxation treatment is carried out is 90 to 200.匸, and preferably 120 to 180 ° C. The amount of relaxation varies depending on the lateral stretching conditions, so that the stretched polyethylene terephthalate film after the relaxation treatment is at 丨5 〇. 〇 320833 12 ^5i〇2 when. . The amount of slack and the temperature are set in such a way that the ripening ratio is 2% or less. The bite processing temperature is usually 180 to 250 〇C, and after 200 炱 245, in order to perform the fixing treatment, the heat fixing treatment is performed with a certain length, and the deflection of the oriented main shaft is reduced to improve the heat resistance and the like. Then, it is the direction of the edge of the 隹I (the direction of film movement) or the relaxation direction of the width direction of the film. The amount of relaxation at this time is adjusted to make the extension after the relaxation treatment. The heat shrinkage rate of the film at 150 ° C is 1 炱 1 〇 % > 乂戍 is preferably 2 to 5%. Transfer Stew < ~ The extended polyethylene terephthalate used in the 赘 中 軏埯 , , , , , , , , , , , , , , , , , , , , , , , , , , , , ) is 10 degrees or less (preferably 8 degrees or less, and the value is more than 1 degree of deflection of the orthorhombic main axis), and the result is not sufficient after the screen of the device is displayed on the screen. After suppressing the color shift, the lower limit of the maximum value of the oriented spindle deflection is not particularly limited, and is preferably more than ^. Further, the above-mentioned extended poly(ethylene dicarboxylate). The maximum value can be measured by, for example, a retardation film inspection apparatus RETS system (manufactured by Otsuka Electronics Co., Ltd.) or a microwave transmission type molecular aligner (manufactured by Oji Paper Co., Ltd.). The thickness of the film of the extended polyethylene terephthalate film is preferably in the range of 20 to 60, preferably in the range of 30 to 5 Å. When the polyethylene terephthalate film is extended When the thickness is less than 2〇# melon, there is a tendency to be difficult to handle (poor handling), in addition When the degree exceeds 60 # m, there is a tendency that the advantages of specialization become less. In addition, the extended polyethylene terephthalate used in the present invention is thin 320833 13 200935102 • » M0R (Maximum Oriented Ratio) The value is 1.5 or more, preferably 2·0 or more, more preferably 2.2 or more, and still more preferably 3.0 or more. This is because an extended polyethylene terephthalate film having a M0R value of less than 1.5 is used. When the polarizing plate is used in a liquid crystal display device, there is a tendency for the oblique interference class to become larger. Further, the polycondensation is performed on the film of the diacetyl acid.

The upper limit of the value is not particularly limited, and may be 7 or less. Here, the M〇R value refers to the ratio of the maximum value to the minimum value of the penetration microwave intensity measured by the penetrating molecular directional meter (maximum/minimum value), which can be used as an anisotropic index. The 払M0R value can be measured using a microwave penetrating molecular aligner (manufactured by Oji Paper Co., Ltd.). Further, it is also possible to impart anti-glare property (foginess) to the extended poly(p-bismuthic acid)-ruthenium film used in the present invention. The method of imparting the anti-glare property is not particularly limited, and for example, a method of mixing inorganic fine particles or organic fine particles into the raw material resin to form a thin film, and stretching the polyethylene terephthalate thin and the product/polarized film side The opposite side surface is coated with a coating liquid obtained by mixing a j microplate or an organic fine particle in a resin binder to form an antiglare layer. For example, a representative of the inorganic fine particles imparting anti-glare properties, can be used as a colloidal silica, an alumina, an oxidation: a cerium salt, an alumina-cerium oxide composite oxide , kaolin, for example, cross, J-calcium phosphate, calcium phosphate, and the like. In addition, the organic fine particles may be resin particles such as resin polyacrylic acid particles, methyl methacrylate/styrene copolymer particles, parental polystyrene particles, crosslinked polymethyl methacrylate helium resin particles, and polyimine particles. . 14 320833 200935102 In addition, depending on the opposite side surface of the extended polyethylene terephthalate film laminated polarizing film side, the ethylene glycol (TAC) is defeated by the adhesive layer or the adhesive layer. A method of preventing a glare property by a method of preventing a smear-resistant protective film composed of a resin film, an olefin resin film, a propylene glycol-based ruthenium film, and a poly-g resin film. The anti-glare protective film is preferably obtained by a method of applying a coating liquid on the surface of a substrate film, mixing organic fine particles or inorganic fine particles in a resin as a substrate, and molding the resin into 》The method of enamel film. When such an anti-glare protective film is used, the thickness of the crucible is preferably in the range of 5 to 120 / zm, preferably in the range of 2 to 8 Å #m. Further, the haze value of such an anti-glare protective film is preferably in the range of 2 to 45%. When the haze value of the anti-glare protective film is less than 2%, there is a possibility that the anti-glare effect may be impaired, and when the haze value of the anti-glare protective film is higher than 45%, There is a possibility that the face is white and the recognition is reduced. Further, surface treatment such as anti-glare treatment, bar coating treatment, and antistatic treatment may be applied to the opposite side surface of the extended polyethylene terephthalate film-laminated polarizing film. Further, a coating layer composed of a liquid crystalline compound or a high molecular weight compound or the like may be formed. Further, almost the same effect can be obtained by substituting the extended polyethylene naphthalate film with the extended polyethylene naphthalate film. - The polarizing plate of the present invention may be laminated on the opposite side of the polyethylene terephthalate film side of the polarizing film layer, and a protective film or an optical compensation film may be laminated. The protective film or the optical compensation film may, for example, be a cellulose resin film such as a triacetyl cellulose film (TAC), an olefin resin film, an acrylic resin film, or a transparent film such as a polyester resin thin film of 320833 15 200935102. Further, on such a transparent film, an optical functional film to be described later may be laminated. The cellulose resin film is a film composed of a part or a complete ester of cellulose. For example, cellulose acetate, propionate, butyrate,

A film composed of such a mixed ester or the like. More specifically, for example, a triacetyl cellulose film, a diacetyl cellulose film, a cellulose acetate propionate film, a cellulose acetate butyrate film, or the like can be given. As the cellulose ester-based film, a commercially available product can be used, for example, FUJITAc TD80 (manufactured by FUjIFILM Co., Ltd.), FUJITAC TD80UFCFUJIFILM (manufactured by FUJITAC TD80UFCFUJIFILM Co., Ltd.), FUJITAC 〇TD80UZ (manufactured by FUJIFILM Co., Ltd.), KC8UX2M (Konica) Minolta Opto (share) system, KC8UY (Konica Minolta Opto system) and so on. Further, the optical compensation film composed of a cellulose resin film may be, for example, a film obtained by containing a compound having a phase difference adjustment function in a cellulose film, and a compound having a phase difference adjustment function applied to the surface of the cellulose film. The film is made of a film which is uniaxially stretched or biaxially stretched and the film is made of a film. Further, in the polarizing plate of the present invention, it is also preferred to use a cellulose acetate resin film to which phase difference characteristics are imparted, and a commercially available product of the cellulose acetate resin film to which the phase difference characteristic is imparted is, for example, wv BZ 438 ( FUJIFILM (manufactured by FUJIFILM Co., Ltd.), WV EA (manufactured by FUJIFILM Co., Ltd.), KC4FR-l (Konica Minolta 〇pto (^)^), KC4HR-1 (manufactured by Konica Minolta Opto Co., Ltd.). Further, the cycloolefin resin film may be uniaxially stretched or biaxially stretched to form an optical compensation film. The cycloolefin resin film refers to a film composed of a thermoplastic resin such as norbornene or polycyclic norbornene monomer, such as a cyclic thin hydrocarbon (cyclone) 320833 16 200935102. The cycloolefin film may be a ring-opening polymer obtained by using early-% or a hydrogen ring of a copolymer obtained by using two kinds of olefins, and/or an aromatic compound having a vinyl group. The olefinic group also has a chelating substance in the main chain or side chain. When a cyclic olefin and a chain olefin and a ruthenium ruthenium ruthenium copolymer are used, the second::===/, the aromatic compound having a vinyl group may, for example, be styrene methyl styrene, Wei Silk benzene and ethylene. In the like copolymer ~ from the ring thin smoke group, the fresh element is 50% of the lamp (compared to 15 to 5 莫 mol%). In particular, when a terpolymer of a cyclic olefin and a chain olefin and an aromatic compound having an ethyl group is produced, the monomer unit composed of a cyclic olefin can be made in a smaller amount as described above. In such a terpolymer, a monomer unit composed of a chain olefin is usually about 5 to 8 mol%, and a monomer unit composed of an aromatic compound having a vinyl group is usually 5 to 8 mol. %about. Suitable commercial products of cycloalkenyl resins are preferably used, for example:

Topas (manufactured by Ticona Co., Ltd.), ART〇N (manufactured by JSR Co., Ltd.), ZE0N0R (manufactured by Nippon Co., Ltd.), ΖΕ0ΝΕΧ (manufactured by Nippon Co., Ltd.), and APEL (manufactured by Mitsui Chemicals Co., Ltd.). When such a cycloolefin resin is formed into a film, a conventional method such as a solvent casting method or a smelting extrusion method can be suitably used. In addition, for example, S-SINA (made by Sekisui Chemical Industry Co., Ltd.), SCA40 (made by Sekisui Chemical Industry Co., Ltd.), ZeonorFilm (made by PTES), and ARTON FILMCJSR (share) may be preliminarily Commercially available film of a cycloolefin resin made into a film 17 320833 200935102 * 'The material is used as a transparent protective film. The cycloolefin resin film as the optical compensation film is preferably oriented in at least one direction: preferably. By this, an appropriate optical compensation function can be imparted, which contributes to the expansion of the viewing angle of the liquid helium B display device. The in-plane retardation value of the extended cyclic olefin resin thin film is preferably 4 Å to 1 Å, and preferably 4 Å to 8 Å. If the in-plane phase difference R. If it is less than 4 〇 nm or more than 1, there is a tendency that the viewing angle compensation ability of the liquid crystal panel is lowered. Further, the phase difference in the thickness direction of the extended cyclic olefin tree ruthenium film is preferably 8 Å to 3 Å (10), and is preferably 250 nm. If the thickness direction phase difference value Rh is less than or exceeds 300 nro', the viewing angle compensation ability for the liquid crystal panel tends to decrease as described above. Further, the in-plane retardation value R° and the thickness direction retardation value IU of the stretched cycloolefin resin film are respectively as shown in the following formulas (1) and (2), and for example, KOBRA 21ADH (Prince Measurement Machine (share) can be used. ))). R〇= (nx — ny)xd (1)

Rth=[(nx + ny)/2-nz]xd (2) (In the above formulas (1) and (2), '(1) is a refractive index in the in-plane slow axis direction of the extended cycloolefin resin film, The refractive index in the direction of the fast axis (the direction perpendicular to the in-plane slow axis direction) in the in-plane direction, and the refractive index in the thickness direction of the extended cyclic olefin resin film is the thickness of the extended cyclic olefin resin film. ) The preferred refractive index characteristics as described above, in addition to the appropriate adjustment of the stretching ratio and the stretching speed, can also be selected by appropriately selecting the preheating temperature, the extension temperature, the heating kit (the treatment for reducing film deflection after stretching), and the cold. It is given by various temperatures (including temperature patterns) such as part temperature. Because of the extension under the more gentle 18 320833 200935102, :=r"·. 5 times-6=^^, when the rate becomes upper=extendable, as long as the thickness of the cyclic olefin resin film which does not extend the maximum direction of orientation is too thick, the processing sharpness is lowered, or the polarizing plate is lowered. The weight is increased to the axis of the chord thickness (4)

The polarizing plate of the present invention extends the polyethylene terephthalate film as a layer of the polarizing film as described above, and the polyethylene terephthalate film is extended in the polarizing film layer as needed. An area layer protective film or an optical compensation film on the opposite side of the side of the vinegar film. The adhesive for bonding the films to each other may be, for example, a water system, that is, a component obtained by dissolving an adhesive component in water or an adhesive component, from the viewpoint of thinning the adhesive layer. Dispersed in water. A preferred adhesive agent is, for example, a composition containing a polyethylene glycol or a polyamine g resin as a main component. Further, when the film is bonded to both surfaces of the polarizing film, the same kind of adhesive may be used, and different kinds of adhesives may be used. When a polyvinyl alcohol resin is used as a main component of the adhesive, the polyvinyl alcohol resin may be a carboxyl group-modified polyvinyl alcohol, in addition to a partially saponified polyvinyl alcohol or a fully saponified polyethylene glycol. A modified polyvinyl alcohol resin such as polyvinyl alcohol modified with acetaminophen, polyvinyl alcohol modified with hydroxyindole, and polyvinyl alcohol modified with an amine group. At this time, an aqueous solution of a polyethylene glycol can be used as an adhesive. The degree of the polyvinyl alcohol resin in the subsequent agent is 320833 200935102, and is preferably from 1 to 5 parts by weight relative to 100 parts by weight of water, usually from 1 to 1 part by weight. In the adhesive consisting of an aqueous solution of polyethyl alcohol resin, it is preferable to add a hardening component such as ethylene light, water-soluble epoxy resin or a crosslinking agent to improve the water-soluble ring. _日匕·^^ ^ ^ 虱 虱 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知 知The polyamine amine polyamine epoxy resin obtained by the reaction of polyamidamine (PQiyadd®). Such a commercial product of polyamine polyamine epoxy resin can be mentioned

For example: Sumirez Resin 650 (manufactured by CHEMTEX Co., Ltd.), Sumirez Resin 675 (manufactured by CHEMTEX Co., Ltd.), WS-525 (made by Japanese pmc). The amount of the curable component and the crosslinking agent added (total amount when added simultaneously) is usually from 100 to 100 parts by weight and from 1 to 50 parts by weight based on 1 part by weight of the polyvinyl alcohol resin. It is better. In this case, when the amount of the curable component and the crosslinking agent added is less than 1 part by weight based on 1 part by weight of the polyvinyl alcohol wax, the effect of improving the adhesion is lowered, and the curable component is further improved. And the amount of crosslinker added relative to the polyethylene tree

When 100 parts by weight of the fat exceeds 1 part by weight, the adhesive layer becomes brittle. Further, when a polyurethane resin is used as a main component of the adhesive, an example of a suitable adhesive composition is, for example, a mixture of a polyester ionomer type polyurethane resin and a compound having a glycidoxy group. Here, the polyester ionic polymer type polyurethane resin refers to a polyamine vinegar resin having a polyester skeleton, and is a small amount of an ionic component (hydrophilic component) introduced therein. Such an ionic polymer type polyurethane resin is emulsified into an emulsion directly in water because it does not use an emulsifier. Therefore, it is suitable as a water-based polyester ion ionic polymer type polyurethane resin, which itself is a conventional example. JP-A-H07-97504 discloses an example of a polymer dispersant for use in a water-based medium, and the Japanese Patent Publication No. 2005-70140 (patent) Document 2), Japanese Unexamined Patent Publication No. 2-5-208456 (Patent Document 4) discloses a mixture of a polyester ion-concentrated polyurethane resin and a compound having a glycidoxy group. 'The sorrow feminine resin film is bonded to a form composed of a polyethylene resin and a light film. The method of bonding the above-mentioned extended polyethylene terephthalate film (and a protective film or an optical compensation film as needed) to the polarizing film is usually as long as it is generally known. For example, according to the flow casting method, the wire bar coating method, the gravure coating method, the comma coating method, the squeezing method, the die coating method, the dip coating method, the spray A method in which an adhesive is applied to a polarizing film and/or a bonding surface of a film bonded thereto, and then laminated on each other. The term "flow casting" refers to a method in which a film as a coated object is moved obliquely in a direction close to a vertical direction, in a horizontal direction, or between the two, and an adhesive is allowed to flow down and spread on the surface thereof. After the adhesive is applied as described above, the polarizing film and the film bonded thereto are bonded by a nip roll or the like to be bonded. Further, it is also preferred to use a method in which the laminate is applied by a roller or the like after the adhesive film is dropped between the polarizing film and the film bonded thereto, and the adhesive is uniformly dispersed. At this time, the material of ^ can be made of metal or rubber. And 'preferably, it can also be used: the film and the film adhered thereto, and the laminate body 320833 21 200935102 is pressed between the light and the pro-pressure to make the adhesive uniformly spread out. The method. In this case, the rolls can be of the same material or different materials. Further, before drying or hardening, the thickness of the ship after the scale is attached is preferably 5/ζιη or less, and preferably 〇 〇 1//m or more. In order to improve the adhesion, the surface of the adhesive layer may be subjected to a surface treatment such as electropolymerization treatment, corona treatment, ultraviolet irradiation treatment, or flame (1) followed by saponification treatment. The deuteration treatment may, for example, be a method of immersing in an alkaline aqueous solution such as sodium hydroxide or potassium hydroxide. The laminate is subjected to a drying treatment via the above-mentioned water-based adhesive-bonded laminate to dry and harden the adhesive layer. The drying treatment can be carried out, for example, by blowing hot air. The drying temperature is suitably selected from the range of 4 〇 to 1 〇 (preferably 60 to 1 〇〇. The range of 〇. The drying time is, for example, about 2 〇 to 12 〇〇 seconds. The thickness of the adhesive layer after drying is usually G. It is about 15_, preferably 0. 〇1_ or more, more preferably below, more preferably Ι/zm. If the thickness of the adhesive layer is too thick, the appearance of the polarizing plate is apt to change. Poor. # After drying, it can be applied at a temperature above room temperature for at least half a day (usually several days or more) to obtain sufficient adhesion strength. Such a hard example is in a state of being wound into a roll. The preferred curing temperature is in the range of 3G to 5Gt, and it is better to choose the relative humidity in the range of round to Cong H in the state of the muscle below the muscle = hard: rtrc '. It is usually about 1 day to 10 days' and is about 2 days to 7 days. 'Time pass 32 833 22 200935102 In addition, a photocurable adhesive can also be used as an adhesive in the polarizing plate of the present invention. The subsequent agent may, for example, be a photocurable epoxy resin and a photocationic polymerization initiator. In this case, the photocurable adhesive is cured by irradiation of the active energy enthalpy. The light source of the active energy ray is not particularly limited, and is preferably an active energy ray having a luminescent distribution at a wavelength of 40 Å or less. It is preferably a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, a metal halide lamp, etc. ® The light intensity of the photocurable adhesive is based on the light hardening. The composition of the adhesive is appropriately determined, and is not particularly limited. The irradiation intensity in the wavelength region effective for the activation of the polymerization initiator is preferably 至. i to 6 〇〇〇 mW/cm 2 . If the irradiation intensity is 〇. When the temperature is lmW/cm2 or more, the reaction time does not become too long. When the temperature is 6,000 mW/cm 2 or less, the radiant heat of the light source and the heat generation of the photocurable adhesive harden cause yellowing of the epoxy resin and deterioration of the polarizing film. The possibility of illuminating the photocurable adhesive is individually controlled according to the hardened photocurable adhesive, and is not particularly limited to It is preferable that the product of the incident intensity and the irradiation time is 1 〇 to WO OOj/cm 2 . The active species of the initiator are generated in a sufficient amount to make the hardening reaction more precise, and if it is 1 μm/cm 2 or less, the irradiation time does not become too long, and good productivity can be maintained. Further, the thickness of the adhesive layer after the irradiation of the active energy ray is usually from about 0.0001 to about 5/zm, preferably from about O.Olym, more preferably from 2 to about m, even more preferably from about 1/m. 320833 23 200935102 When the photocurable adhesive is cured by irradiation of an active energy ray, the polarizing degree, transmittance and color of the polarizing film, and the extended polyethylene terephthalate film, protective film, and optical It is preferable to perform hardening under the condition that the various functions of the polarizing plate such as the transparency of the compensation film are not lowered. The polarizing plate of the present invention is used for laminating the outer surface of the opposite side of the polyethylene terephthalate film side of the polarizing film (when a protective film or an optical compensation film is laminated, the protective film or the optical compensation film is laminated It is preferable that the surface on the opposite side of the polarizing film side is formed to adhere the polarizing plate to the liquid crystal cell. The adhesive to be used in such an adhesive layer is not particularly limited, and a conventionally suitable adhesive can be used, and examples thereof include an acrylic adhesive, a polyurethane adhesive, and a polyoxygen adhesive. Among them, from the viewpoints of transparency, adhesion, reliability, secondary workability, etc., it is preferred to use an acrylic adhesive. The adhesive layer may be used in the form of, for example, an organic solvent solution, and the adhesive is applied to a substrate film by a die coater or a gravure coater, and then dried. Alternatively, it may be provided by a method of transferring a sheet-like adhesive formed on a plastic film (referred to as a separator) which is subjected to release treatment to a substrate film. The thickness of the adhesive layer is also not particularly limited, but is generally preferably in the range of 2 to 40 / / m. The optical functional film may be adhered to the outside of the polarizing plate via the adhesive layer. The optical functional film may be, for example, an optical compensation film coated with a liquid crystal compound on the surface of the substrate, and an optical compensation film oriented to the surface, in addition to the above-mentioned cellulose film or cycloolefin film. The polarized light penetrates and reflects the opposite of the polar light of the opposite nature. 320 320833 200935102 The polarizing film of the type, the retardation film made of polycarbonate resin, and the thin film with anti-glare function on the surface The surface is subjected to an anti-reflection treatment, a reflective film having a reflective function on the surface, and a semi-transparent reflective film having both a reflection and a penetrating function. It is equivalent to the surface of the substrate and, ..., NR Film (manufactured by Shin Sakamoto Oil Co., Ltd.). For example, DBEF (manufactured by 3M Co., Ltd., which is capable of self-coating a liquid crystal compound and oriented optical compensation film), is equivalent to a reflection type of a polarized light having a characteristic opposite to that of a specific partial reflection. Commercially available products include, for example, FUm (manufactured by FUJIFILM Co., Ltd.), NH (manufactured by Nippon Oil Co., Ltd.), 0 Aurora (four), and Kokuban, which is obtained from Tokuno 0 (share), APF (made by 3M Company, in 曰本Can be from Sumitomo 3M (shares) / 0) and so on. In addition, 'the equivalent of a retardation film composed of a cyclic olefin resin, for example, ART0NFILM (JSR), S-SINA (product of the product, water chemical industry) ZeonorFilm ((share) 0PTES system) and so on. The present invention also provides a liquid crystal display device in which a liquid crystal panel of the above-described polarizing plate of the present invention is bonded to a liquid crystal cell. As a result, the polarizing plate of the present invention is bonded to the back side or the front side of the liquid crystal cell, and is bonded to the back side and the front side. In the liquid crystal display device of the present invention, the liquid crystal display device of the present invention is provided with a liquid crystal panel having a polarizing plate of the present invention provided on the back surface of the liquid crystal cell, and can be thinned at the same time. The I / the corrugated panel is prevented from coming into contact with the backlight system by the mechanical strength and the arrangement of the polarizing plate of the present invention on the back side of the liquid crystal panel. The liquid crystal display device of the present invention suitably constitutes a liquid crystal display device other than the liquid crystal panel. For the portion other than the above-mentioned features, a conventional liquid crystal display device can be used.

The components (light diffusing plate, backlight, etc.) provided in the medium 'P Ϊ 25 320833 200935102 are not particularly limited. Further, the light-diffusing sheet means an optical member having a function of diffusing from a source of the back, and for example, a light-diffusing agent can be dispersed in a thermoplastic resin to impart light diffusibility to a thermoplastic resin sheet. The surface of the thermoplastic resin sheet is provided with a coating layer of a resin composition in which particles are dispersed, and the light diffusing property is formed. The thickness of the light diffusing plate is not particularly limited, and it is preferably in the range of 01i 5 coffee. Further, a prism sheet (also referred to as a condensing sheet, for example, bef (manufactured by 3M Co., Ltd.)) and a brightness-increasing sheet may be disposed between the light-diffusing sheet and the liquid crystal panel (and the above-described reflective polarizing) Other films having the same optical properties (DBEF, APF-specific), light-diffusing sheets, and the like, which are optically functional. Other sheets showing optical performance can be arranged in plural as needed. Further, as the light diffusing plate, for example, a prism sheet having a cylindrical shape on the surface and a light diffusing plate are integrated (for example, those described in Japanese Patent Laid-Open Publication No. 2006-284697). An optical sheet that combines other functions with a light diffuser. The polarizing plate of the present invention preferably uses a backlight/light diffusing plate/light diffusing film/wafer-up sheet/liquid crystal cell. In addition, the "back side" of the liquid crystal cell and the liquid crystal panel means the backlight side when the liquid crystal cell is mounted on the liquid crystal display device, and the "front side" of the liquid crystal cell and the liquid crystal panel are Refers to the viewing side when the liquid crystal cell is mounted on the liquid crystal display device. (Embodiment) Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by the embodiments. Further, in the examples, % and parts indicating the content and the amount used are based on weight unless otherwise specified. In the following examples, the in-plane phase difference R of the optical compensation film composed of the extended norbornene resin. And the thickness direction phase difference value Rth is a value obtained by measuring using KOBRA 21ADH (manufactured by Wangzi Measuring Machine Co., Ltd.). Further, the offset angle and MO R ' relative to the axis of extension of the oriented major axis of the extended polyethylene terephthalate film are measured using a microwave penetrating molecular aligner (manufactured by Oji Paper Co., Ltd.). The value. ® (Example 1) After immersing a polyvinyl alcohol film having an average degree of polymerization of about 2400 and a degree of saponification of 99.9 mol% or more and immersing it in pure water of 3 ° C, it was immersed in iodine at 30 ° C. / The weight ratio of potassium iodide / water is 0.02 / 2 / 100 in an aqueous solution. Then at 56.5. (: immersed in an aqueous solution of iodide/boric acid/water in a weight ratio of 12 / 5 /1 Torr. Then, after washing with 8 C of pure water, 'dry at 65 ° C to obtain a polyvinyl alcohol. The iodine is adsorbed with a directional iodine thin film. The extension is mainly carried out in the step of iodine dyeing and boric acid treatment, and the total extension ratio is 5.3 times. One side of the polarizing film obtained above is on the bonding surface. After the corona treatment, the stretched polyethylene terephthalate film having a thickness of 45/zm was adhered via a photocurable adhesive (offset angle with respect to the axis of extension of the orientation main axis: 2 degrees, MOR: 3) 4) Next, on the opposite side of the side of the polarizing film laminated with the polyethylene terephthalate film, after applying the corona treatment to the bonding surface, the thickness is 73# m via the photocurable adhesive. An optical compensation film (in-plane phase difference R: 63 nm, thickness direction phase difference 'value Rth: 225 nm) was obtained by extending a norbornene-based resin to obtain a polarizing plate. On the outer surface of the optical compensation film, an acrylic adhesive with a thickness of 25/zm is set. After the agent layer, the outer surface side of the optical compensation film on which the adhesive layer is formed is disposed on the back surface of the liquid crystal cell, and a commercially available polarizing plate (Sumikalan SRW842E to GL5 'Sumitomo Chemical Co., Ltd.) is disposed in front of the liquid crystal cell. After assembling the liquid crystal panel ' and using the liquid crystal panel to fabricate a liquid crystal display device comprising a commercially available backlight/light diffusing plate/diffusion sheet/diffusion sheet/brightness improving sheet (DBEF)/liquid crystal panel. After the display of the I device, it was found that the oblique color spots (disturbing spots) were small and the visibility was good. In addition, the warpage of the liquid crystal panel was also small. (Example 2) Except for the extension with respect to the orientation main axis A polarizing plate was prepared in the same manner as in Example 1 except that the offset of the axis was 5 degrees and the M0R was 3.4. The liquid crystal display device was produced using the polarizing plate. The liquid crystal display device was observed by the naked eye and found that the oblique color spots (disturbing spots) were small and the visibility was good. In addition, the green crystal of the liquid crystal panel was also small (Comparative Example 1). A polarizing plate was prepared in the same manner as in Example 1 except that the offset angle of the extending axis of the oriented main axis was 3 、 and _ was 3.4, and the polarizing plate was used. The Μ display device was produced. For the obtained liquid crystal display device, it was observed by naked eyes that oblique spots (interference spots) were observed. Furthermore, the liquid crystal panel 320833 28 200935102 has a small surface curvature. [Simple description] No [main component symbol description]

Claims (1)

200935102 VII. Patent application scope: 1. A polarizing plate characterized by comprising a polarizing film composed of a polyvinyl alcohol resin and an extended polyethylene terephthalate laminated on the side of the polarizing film via an adhesive. The film has an offset angle of 10 degrees or less with respect to an extending axis of the oriented main axis of the extended polyethylene terephthalate film, and a M0R value of 1.5 or more as measured by a microwave penetrating molecular aligner. 2. The polarizing plate of claim 1, wherein the polarizing film is laminated on the opposite side of the polyethylene terephthalate film side, and the laminated film is provided with a protective film or an optical compensation film. 3. The polarizing plate of claim 1 or 2, wherein the adhesive layer is formed on the outer side of the side opposite to the side of the polyethylene terephthalate film on which the polarizing film is laminated. 4. A liquid crystal display device comprising a liquid crystal panel in which a polarizing plate of the third application of the patent application is bonded to a liquid crystal cell via an adhesive layer. 30 320833 200935102 IV. Designated representative map: There is no schema in this case (1) The representative representative map of this case is: (). (2) A brief description of the symbol of the representative figure: 5. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: This case does not represent the chemical formula 320833