TW201247399A - Method of manufacturing polarizer - Google Patents

Abstract

A method of manufacturing a polarizer 4 is disclosed, which comprises the following steps of (A) to (E), namely step (A) of coating UV-curable adhesive containing polymerization initiator on the optical film 2 made from thermoplastic resin; step (B) of overlapping a polarizing film 1 made from polyvinyl alcohol on the UV-curable adhesive coated surface of the optical film 2, and pressurizing the optical film 2 relative to the polarizing film 1 to obtain a laminate of the polarizing film 1 and the optical film 2 bonded with UV-curable adhesive; step (C) of curing the adhesive through irradiation of UV rays from an UV irradiating apparatus 16; step (D) of using a spectroradiometer 17 in a spectrometer to measure the spectral irradiance of the irradiated UV rays, and to obtain the integral value of the spectral irradiance of the irradiated UV rays within the specific absorption wavelength region containing the absorption peak wavelength of the polymerization initiator; and step (E) of controlling the UV irradiating apparatus 16 based on the obtained integral value X of the spectral irradiance and the preset integral value Y of the spectral irradiance.

Description

201247399 VI. Description of the Invention: TECHNICAL FIELD The present invention relates to a method of manufacturing a polarizing plate used as a liquid crystal display member. [Prior Art] A liquid crystal panel constituting a core of a liquid crystal display device is configured by arranging a polarizing plate on both surfaces of a liquid crystal cell. In general, the polarizing plate has a structure in which a protective film made of a transparent resin is bonded to the surface of one side of the polarizing film made of a polyvinyl alcohol-based resin via an adhesive. The surface of the other side of the polarizing film is also bonded to the other side of the polarizing film via a bonding agent. The transparent resin film on the side is the same as the protective film on the opposite side, and has a function of protecting only the polarizing film. In the case of a so-called retardation film, in addition to the protective function, a phase difference in the in-plane and/or thickness direction is imparted for the purpose of optical compensation of the liquid crystal cell and compensation of the viewing angle. In the present specification, the protective film and the retardation film which are bonded to the polarizing film via the adhesive are referred to as "optical films". The adhesive for bonding the optical film to the polarizing film is generally liquid, and the adhesion between the polarizing film and the optical film is exhibited by the curing reaction of the liquid adhesive. In recent years, the price of liquid crystal display devices represented by television has dropped sharply, and the requirements for lowering the price of the components constituting them have become stronger. On the other hand, the requirements for quality have been further strengthened. Under this trend, the manufacturer of polarizing plates The type of the optical film to be used is also limited to a water-based adhesive of a specific resin such as a cellulose resin, and is changed to an active energy ray-curable adhesive having a wide variety of applicable optical films. The bonding of a polarizing film using an active energy ray-curable adhesive to an optical film is proposed in Japanese Patent Publication No. 163414. The active energy ray-curable adhesive is prepared in a liquid form, and is applied to a coating machine directly coated with the liquid adhesive on the coated object, or in a groove formed on the surface to carry a liquid adhesive. This is transferred to a gravure roll on the surface of the object to be coated, and is applied in advance to the bonding surface of the optical film to the polarizing film. Then, the polarizing film is superposed on the adhesive-coated surface, and an active energy ray such as an ultraviolet ray or an electron beam is irradiated to cure the adhesive, thereby exhibiting an adhesive force. It is a very effective method to use an optical fiber film which is applicable to such an active energy ray-curable adhesive. As a method of producing a polarizing plate using the active energy ray-curable adhesive, a method is disclosed in, for example, Japanese Patent Laid-Open Publication No. 2009-134190, which is obtained by superposing a protective film on both surfaces of a polarizing film via an adhesive. The laminated body is irradiated with an active energy ray while adhering the laminated body to the outer surface of the convex curved surface which is formed in a circular shape along the conveying direction of the laminated body. According to this method, it is possible to suppress the reverse curl and the wave curl which are easily generated on the obtained polarizing plate, thereby producing a polarizing plate having good performance. [Explanation] [Problems to be solved by the invention] Ultraviolet rays are irradiated The method of manufacturing a polarizing plate by curing a curing adhesive causes the lamp of the ultraviolet irradiation device to deteriorate over a long period of time, and even if the electric power of the same load is applied, the illuminance of the ultraviolet ray is gradually lowered. In this case, 'ultraviolet curing 5! The curing of the agent is insufficient, and the performance of 163414.doc 201247399 as a polarizing plate may be insufficient. x 'If it is still used for a long period of time, the lamp or the filter or the reflector attached to the ultraviolet irradiation device, the glass placed on the front surface, etc. may be contaminated due to the setting environment of the ultraviolet irradiation device or the structural problem of the device. In this case, in the ultraviolet light to be irradiated, for example, the transmittance of light having a wavelength of 400 nm or less is reduced, and the illuminance is lowered, and the curing of the ultraviolet curable adhesive is also considered to be insufficient. When the curing of the ultraviolet curable adhesive is insufficient, there is a problem that the adhesive strength is insufficient, and the polarizing film causes discoloration or the like in the durability test, which adversely affects the performance as a polarizing plate. A method of manufacturing a polarizing plate in which an ultraviolet curable adhesive is appropriately managed by ultraviolet illuminance. The illuminance of the ultraviolet ray to be irradiated is generally measured using an ultraviolet sensor device such as GaN or AlGaN called a power monitor. However, the power monitor has a problem that the measurement accuracy of the illuminance is relatively low for the following reasons: 1) The detection wavelength of the ultraviolet sensor device is limited to a specific wavelength region, and the measurement sensitivity (sensitivity of light absorption per wavelength) is Each wavelength is different; 2) Due to the problem of heat resistance, the illuminance of the irradiated ultraviolet light cannot be directly measured, and the illuminance of the illuminating light is indirectly measured by measuring the reflected light of the irradiated ultraviolet light. Due to this problem, the power monitor is applied to the production of a polarizing plate using an ultraviolet curing type adhesive, and it is difficult to accurately detect the ultraviolet curing type adhesive which has a significant influence on the curing degree of the ultraviolet curing type adhesive. A decrease in the irradiance of the wavelength region required for activation of the polymerization initiator. Therefore, it is desirable to develop a radiation illuminance reduction that can accurately detect the specific wavelength region, and 163414.doc 201247399 can manufacture a polarizing plate while maintaining the required spectral illuminance. Therefore, the subject of the present invention is to provide a method for curing the ultraviolet curable adhesive by ultraviolet light m-type bonding (four) bonding on a polarizing film, and the film forming method can accurately detect ultraviolet rays. The illuminance of the light illuminance, in particular, the irradiance of the wavelength region required for the activation of the polymerization initiator, can be produced by appropriately controlling the discoloration of the polarizing film even under the severe conditions of high temperature and high humidity. A polarizing plate with high durability. [Means for Solving the Problems] The present invention provides a method for producing a polarizing plate which is obtained by laminating a thermoplastic resin with a UV-curable adhesive containing a polymerization initiator, on a polarizing film made of a polyethylene glycol resin. A method of producing a polarizing plate by an optical film and having the following steps (A), (B), (C), (D), and (E). (A) a coating step of applying the above-mentioned ultraviolet curable adhesive to the bonding surface of the optical film to the polarizing film; (B) a bonding step of applying the ultraviolet curable adhesive to the coating step (C) a curing step in which a laminate of an optical film is bonded to a polarizing film via an ultraviolet curing type adhesive, and ultraviolet rays are irradiated from the ultraviolet irradiation device to thereby form an ultraviolet curing adhesive. (D) a measuring step 'measuring the illuminating illuminance of the illuminating light in the curing step described above using the spectrometer' and measuring the specific absorption wavelength region including the absorption peak wavelength of the polytropic initiator, For example, the absorption of ultraviolet light in the wavelength range of -40 nm to +40 nm of the peak wavelength 163414.doc 201247399 the integral value of the irradiance; and (E) the control step, according to the integral value γ of the set spectroscopic illuminance The obtained ultraviolet illuminating device is controlled by the integral value of the astigmatism illuminance. The method for producing a polarizing plate of the present invention preferably comprises the following step (E). (E) a control step of, for example, when the ratio of the absolute value of the difference between the integral value X of the spectral illuminance obtained by the measurement step and the integral value of the set spectroscopy illuminance is greater than or equal to a specific value When it is 5% or more, the output of the above ultraviolet irradiation device is controlled. Further, the method of the other aspect of the present invention provides a method of producing a polarizing plate having the following steps (A), (B), (C), (D), and (E). (A) a step of applying an ultraviolet curable adhesive containing a polymerization initiator to an optical film made of a thermoplastic resin; (B) a step of superposing a polyvinyl alcohol resin on the surface of the ultraviolet curable adhesive coated on the optical film The polarizing film is prepared, and the optical film is pressed against the polarizing film to obtain a laminate in which the polarizing film and the optical film are bonded via the ultraviolet curing type adhesive; (C) Step 'UV irradiation of the laminate by the ultraviolet irradiation device And curing the ultraviolet curable adhesive; (D) Step 'measuring the light illuminance of the irradiated ultraviolet light using a spectrometer, and obtaining a specific absorption wavelength region including the absorption peak wavelength of the polymerization initiator, for example, An integral value of the illuminating illuminance in a wavelength region where the absorption peak wavelength is smaller than 4 〇ηηι to a wavelength 40 nm larger than the absorption peak wavelength; and (E) the step 'according to the set integral value of the spectroscopic illuminance γ is used to control the ultraviolet irradiation device by obtaining the integral value of the spectral irradiance of 1634I4.doc 201247399. The manufacturing method of the other aspect of the invention preferably comprises the following (£) step. (E), the ratio of the absolute value of the difference between the integral value of the obtained spectral irradiance illuminance and the integral value Y of the set spectral illuminance to the integral value Y of the set illuminating illuminance is a specific value or more In the case of, for example, 5% or more, the ultraviolet irradiation device is controlled. [Effects of the Invention] According to the present invention, when an optical film is bonded to a polarizing film via an ultraviolet curable adhesive, and the ultraviolet curable adhesive is cured by ultraviolet irradiation to produce a polarizing plate, the spectrometer is accurately used. The integrated value of the spectral illuminance in the specific absorption wavelength region including the wavelength of the absorption ridge of the polymerization initiator contained in the ultraviolet curing type adhesive is measured, and the output of the ultraviolet irradiation device is controlled according to the result to prevent the ultraviolet curing type from proceeding. The curing of the agent is insufficient. Therefore, it is possible to provide a polarizing plate which has good adhesion strength and is difficult to produce discoloration of the polarizing film even under severe conditions such as south temperature and humidity. [Embodiment] In the present embodiment, a polarizing plate is produced by laminating an optical film made of a thermoplastic resin to a polarizing film made of a polyvinyl alcohol-based resin via an ultraviolet curable adhesive (hereinafter simply referred to as an adhesive). The optical film may be attached only to one side of the polarizing film or may be bonded to both surfaces of the polarizing film. When the optical film is bonded to both surfaces of the polarizing film, the method of the present invention can be applied to the bonding of one of the optical films. The method of the present embodiment can also be applied to the bonding of the two optical films. 163414.doc 201247399 [Polarizing film] The polarizing film is made of a polyvinyl alcohol-based resin and has a property of being incident on the film.

The film of the property of light absorption of the vibrating surface is typically a dichroic dye adsorbed and aligned on a polyvinyl alcohol tree. The polyvinyl alcohol-based resin constituting the polarizing film is obtained by saponifying a polyvinyl acetate-based resin. The polyvinyl acetate-based resin which is a raw material of the polyvinyl alcohol-based resin may be a copolymer of vinyl acetate and other monomers, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate Sa. . The polarizing film can be produced by subjecting the film made of the polyethylenic alcohol resin to uniaxial stretching, dyeing with a dichroic dye, and dyeing and crosslinking treatment after dyeing. As a coloring pigment, an organic dye filled or colored is used. Uniaxial stretching can be carried out before dyeing with dichroic pigments, too · 5 Γ also "ill m — a 1.1 a 士"

[Optical film]

The polarizing plate produced is assembled by using the excellent characteristics. For the same reason, the optical film has a refractive index of 1.45 to 1.67, which is better than 163414.doc 201247399. The haze value of the optical film is in the range of about 0.001 to 3%, which causes the contrast of the polarizing plate to be obtained, which is particularly likely to be caused by a problem such as a decrease in brightness when the liquid crystal panel is assembled and black-displayed. Therefore, it is preferred. The haze value is measured by (diffusion transmittance / total light transmittance) χ 100 (%), and is measured in accordance with JIS κ 7136: 2000 "Method for determining the haze of plastic-transparent material". The thermoplastic resin constituting the optical film is exemplified by the following materials, and the refractive index measured by D rays at a temperature of 20 ° C is shown as nD (20 ° C). Cycloolefin resin [nD (20 ° C) = 1.51 to 1.54], crystalline polyolefin resin [nD (2 (TC) = 1.46 to 1.50 or so], polyester resin [nD (20 ° C) = 1.57-1.66 or so, polycarbonate resin [nD (20 ° C) = 1.57 to 1.59 or so], acrylic resin [nD (20 ° C) = 1.49 to 1.51 or so], triethyl cellulose resin [ 〇 (2〇. 〇=1.48 before and after], etc. The cycloolefin resin is a polymer mainly composed of a norbornene-like cycloolefin monomer, including: a cycloolefin monomer. a resin obtained by hydrogenating a ring-opening polymer; and a cyclic olefin monomer and a chain olefin monomer having a carbon number of 2 to 10 such as ethylene and propylene and/or a vinyl aromatic monomer such as styrene The crystalline polyolefin resin is a polymer having a chain olefin monomer having 2 to 1 carbon atoms as a main constituent unit, and includes homopolymerization of a chain olefin monomer. And a copolymer of two or more kinds of chain olefin monomers having two or more chains, specifically, polyethylene resin, polypropylene 163414.doc •10·201247399 a eucalyptus 6-ene-propylene copolymer, a homopolymer of 4-methylpentefene, or a copolymer of 4 f-based pentylene oxime and a mother or propylene, etc., in addition to, for example, poly-p-phenylene Ethylene glycolate or an aromatic polyester-based resin such as polynaphthene, which also includes aliphatic t-trees, such as carbonated vinegar-based resin, is typically made by double-aged enamel and light. It is obtained by a gas reaction and has a carbonate-bonded polymer in the main chain. The acrylic acid tree is typically composed of methyl methacrylate methyl vinegar as the main component of the early polymer 'except methacrylic acid In addition to the homopolymer of vinegar, it also includes copolymers of methacrylic ester and other methacrylates and/or acrylates, etc. Triacetate cellulose resin is an acetate of cellulose. The film can be formed into a film by a solvent casting method, a melt extrusion method, or the like, and can be used as an optical film of the present embodiment. Further, it can be used for further uniaxial or biaxial stretching after film formation. The light-drying film of the embodiment can be attached to the optical film before it is attached to the polarizing film. The surface may be subjected to a saponification treatment, a corona treatment, a plasma treatment, a primer treatment or an anchor coating treatment, and may be carried out on the opposite side of the bonding surface of the optical film to the polarizing film. The surface of the film is provided with various treatment layers such as a hard coat layer, an antireflection layer or an antiglare layer. The optical film preferably has a thickness of about 5 to 200 μm. If the optical film is too thin, the handleability is poor, and the polarizing plate is used. On the other hand, if the thickness is too large, the obtained polarizing plate becomes thick and the weight becomes large, which impairs commercial properties. For these reasons, it is better. The thickness is 10 to 120 μm, and further preferably 10 to 85 μΐΏ. [Ultraviolet-curing adhesive] 163414.doc 201247399 When the optical film is bonded to the above polarizing film, the film is first attached to the polarizing film. An ultraviolet curable adhesive is applied to the surface. The thickness of the subsequent agent is usually in the range of 0.5 to 5 μm. If the thickness is lower than 〇5, then the intensity will be uneven. D _ card, surface 'if its thickness exceeds 5 μηι', not only the manufacturing cost increases, but also the polarizer is affected by the type of the adhesive. Hue. If it is thicker in this range, for example, it is 3.5 or more, especially if there is some variation in the thickness of the special system 4, it is difficult to cause defects such as gas and bag, but on the other hand, it is thickened. The increase in cost is therefore 'thus better to thin the range possible. For these reasons, the preferred thickness of the ultraviolet curable adhesive is a thickness of 4, more preferably &卜紫化型接剂, as long as it is in a liquid formable state

Hit is based on the viewpoint of various kinds of subsequent properties in the manufacture of a polarizing plate = (4) Γ polymerizability and the like, and is preferably a cationic poly-a compound such as an epoxy compound, more specifically, such as 曰Patent Description of the Unexamined Patent Publication No. 2004-245925# if ^ ^ ^ < slaves contain no molecules within the molecule

The oxidizing agent is an ultraviolet curing type adhesive which is one of ultraviolet curable components. The epoxy compound is externally fixed to the outer line of the rabbit. The horse is as follows: a hydrogenated sulfhydryl compound nucleoside obtained by using the aromatic bis bisphenol A as a representative material of the aromatic epoxide compound An epoxy which is bonded and condensed with glycidol to obtain a bond: oxime; an alicyclic epoxidation having at least one oxy group with an aliphatic oxime in the molecule as a representative example, a family ring ::: In the broadening curable adhesive, in addition to the cationically polymerizable compound represented by the epoxy compound as a representative example 163414.doc 12 201247399, a polymerization initiator is further formulated, in particular, a cation is generated by irradiation of ultraviolet rays. A photocationic polymerization initiator for initiating polymerization of a cationically polymerizable compound with an active species or a Lewis acid. Further, a thermal cation polymerization initiator which initiates polymerization by heating may be blended, and various additives such as a photosensitizer may be formulated. When the optical film is bonded to both surfaces of the polarizing film, the ultraviolet curable adhesives suitable for the respective optical films may be the same or different, but from the viewpoint of productivity, it is preferable to obtain a suitable adhesive force, preferably. Both surfaces are set to the same adhesive. [Manufacturing Method of Polarizing Plate] In the present embodiment, a polarizing plate is produced by laminating an optical film made of a thermoplastic resin to a polarizing film made of a polyvinyl alcohol-based resin described above via an ultraviolet curable adhesive. At this time, the following steps (A), (B), (C), (D), and (E) are performed. (A) a coating step 'applying the above-mentioned ultraviolet curable adhesive to the bonding surface of the optical film to the polarizing film; (B) a bonding step 'in the ultraviolet curing type adhesive surface coated by the coating step (C) a curing step of curing the ultraviolet curable adhesive by irradiating ultraviolet rays from the ultraviolet irradiation device to the laminate on which the optical film is bonded via the ultraviolet curable adhesive on the polarizing film. (D) a measuring step of measuring the spectral irradiance of the ultraviolet ray irradiated by the curing step using a spectrometer, and based on this, measuring the astigmatism of the ultraviolet ray in the specific absorption wavelength region including the absorption peak wavelength of the polymerization initiator. Doc •13- 201247399 The integral value of the illuminance; and (E) the control step, the integral value X of the astigmatism illuminance obtained in the above measurement step and the (four) value of the pure illuminance of the set ^ When the ratio with respect to the above Y is a specific value or more, it is, for example, external. In the above, the output of the above ultraviolet irradiation device is controlled. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view schematically showing an arrangement example of a manufacturing apparatus which is preferably applied to the present invention, and Fig. 2 is a block diagram showing an example of a relationship between steps of the present invention for a polarizing plate. Hereinafter, the manufacturing method of these rounds will be described in detail. The manufacturing apparatus shown in FIG. 1 is configured such that the first optical film 2 is bonded to the surface of one side of the polarizing film, and the second optical film 3 is bonded to the other side of the polarizing film. 'And take it on the take-up pro. As shown in the figure, the optical film is bonded to both surfaces of the polarizing film 典型. However, the form in which the optical film is bonded only to the surface of one side of the polarizing film 1 is of course included in the present embodiment. The form of this case is removed from the description below with respect to another optical film. Thus, those skilled in the art can easily understand the extent to which it can be carried out. On the surface of the first optical film 2 to which the polarizing film 1 is bonded, the first coating machine 1 is coated with an ultraviolet curing type adhesive, and on the other hand, the second optical film 3 is bonded to the polarizing film 1. The second coating machine 12 is also coated with an adhesive. After applying the ultraviolet curable adhesive, the adhesive coating surfaces of the first optical film 2 and the second optical film 3 are superposed on both surfaces of the polarizing film 1, and are sandwiched by the nip rollers 20 and 21 for bonding. Pressurization in the thickness direction, followed by irradiation of ultraviolet rays from the ultraviolet irradiation device 16 to cure the adhesive, and then the obtained polarizing plate 4 is taken up by winding the first and second views 22, 23 On the take-up roll 30. Here, the manufacturing apparatus shown in FIG. 1 is provided with a spectroscopic illuminometer 17 composed of a spectrometer between the ultraviolet irradiation device 16 and the film to be conveyed, which can be used to make ultraviolet rays on the line on the manufacturing line of the polarizing plate. While the curable adhesive is cured and the ultraviolet ray is irradiated from the ultraviolet ray irradiation device, the illuminating illuminance of the ultraviolet ray irradiated to the laminated body in which the optical film is bonded to the polarizing film via the ultraviolet curable adhesive is measured. Then, based on the measurement of the astigmatism illuminance from the spectroscopic illuminometer 17, the integrated illuminating illuminance value of the spectroscopy in the specific absorption wavelength region including the absorption peak wavelength of the polymerization initiator contained in the ultraviolet curable adhesive is measured. Furthermore, as shown in FIG. 1, it is also preferable to use the first film thickness gauge 14 and the second film thickness on the line after the application of the adhesive on the manufacturing line of the polarizing plate and before the polarizing film is bonded to the optical film. The thickness of the ultraviolet curable adhesive applied to the optical film was measured, and based on the measurement result, the coating thickness control mechanism of the coater was controlled in such a manner as to maintain a uniform desired thickness of the adhesive. In the first coater 10 and the second coater 12, the ultraviolet curable adhesive is applied to the first film 2 and the second optical film 3 by the intaglios 11, 13 provided on the respective coaters 10 and 12. On the surface on one side of the polarizing film i or the surface on the opposite side to the surface on which the first optical film 2 and the second optical film 3 are coated with the adhesive, the transfer guide roller 24β is appropriately provided as described above. When the optical film is bonded to only one side of the polarizing film, one of the first optical film 2 and the second optical film 3 (for example, only the first optical film 2) may be applied. The straight arrow in the figure shows the flow direction of the 7F film, the curve arrow table * the rotation of the roller 163414.doc -15- 201247399 Most of the polarizing film 1 is used in the manufacturing process of the polarizing film not shown in the figure. After the resin film is uniaxially stretched and produced by a boric acid cross-linking treatment after staining with a coloring dye, it is supplied directly without being wound up, and of course, it is manufactured in a polarizing film manufacturing step. The film is taken up on the roll and then taken out by the extractor. On the other hand, the = - optical film 2 and the second optical film 3 are taken out from the rolls (not shown) by a pomelo extractor. Each of the films is conveyed at the same linear velocity, for example, a linear velocity of about 1 〇 to 5 〇... minutes, in the same flow direction. The first optical film 2 and the second optical film 3 are extracted while being subjected to a tension of, for example, about 50 to 1000 N/m in the flow direction. Then, the first coating machine 10 and the second coater 12 perform the above-described coating step (A) 'the above-mentioned bonding step (B) by the bonding nip rollers 20, 21 'by ultraviolet rays The illuminating device 16 performs the above-described curing step (〇, the above-described measuring step (D) is performed by the spectroscopic illuminometer 17, and the above control is performed by feeding back the measurement result of the spectroscopic illuminometer 17 to the ultraviolet ray irradiation device 丨6. Step (E). An example of the relationship between the steps is illustrated in accordance with the block diagram of Fig. 2. First, after the coating step (A) and the bonding step (B) are performed, the setting (〇) is set as the spectral radiation. The wavelength value of the integral object of the illuminance, and the set value of the integrated value of the illuminating illuminance of the ultraviolet ray (the integrated value of the astigmatism of the astigmatism ray set) γ. The setting (〇) can of course be before the bonding step (B) Or before the coating step (Α). The wavelength region which is the integral object of the spectral illuminance includes the absorption wavelength of the absorption peak wavelength of the polymerization initiator 163414.doc -16·201247399, depending on the polymerization used. The initiator determines the integral value γ of the set spectroradiance illuminance, and the pre-validation allows the adhesive to be cured well, and the polarizing film is difficult to produce discoloration with high durability even under severe conditions of high temperature and high humidity. β is selected within the range of the plate, and then the curing step (C) is performed by irradiating ultraviolet rays from the ultraviolet irradiation device 16 and the ultraviolet ray irradiated by the spectrometer is used to measure the ultraviolet ray to be irradiated in the wavelength range of the setting (〇) setting. The integral value of the astigmatism illuminance (the integral value of the astigmatism illuminance obtained) χ and output it (the leaf test step (D)). On the other hand, in the control step (Ε), it will be obtained. The integral value X of the spectroscopic illuminance is compared with the integral value Υ of the set spectroscopic illuminance. Then, for example, the absolute difference between the integral value X of the astigmatism illuminance obtained and the integral value γ of the set spectroscopy illuminance is absolute. The value is equal to or greater than a specific threshold value γ with respect to the integral value γ of the set spectroscopic illuminance, for example, 5% or more, so that the absolute value of the difference between the two is small, and it is preferable to make The amount of light obtained by the household (4) illuminance integral value 乂 and the set split light light ', the product of the degree is the absolute value of the difference of the value γ, relative to the integral value of the set spectral irradiance Υ, but not the specific interval For example, the electric power input to the ultraviolet irradiation device 16 is adjusted and the output is controlled, for example, as described below. As described above, there is a long-term use of the lamp of the ultraviolet irradiation device, or is attached to the ultraviolet irradiation device. The long-term use of the components: wood causes a decrease in the irradiance of the radiance in a specific wavelength region, but it also includes the integral value of the astigmatism of the astigmatism that is usually transmitted due to the long-term use of the ultraviolet ray irradiation device. The continuous value is lower than the integral value γ of the set spectroscopic illuminance. 163414.d〇( -17· 201247399 Here, the integral value of the astigmatism illuminance obtained χ and the set split radiance... The case where the absolute value of the difference of γ is 5% or more with respect to the set integral value of the spectral illuminance is set to mean that the following formula (1) is satisfied, and FIG. 2 shows whether or not purple is performed depending on whether or not the formula is satisfied. It means changing the output condition of the line irradiated. Further, the method of comparing the integral value 分 of the spectral illuminance illuminance obtained in the present embodiment with the integrated value of the set spectral illuminance ’ is not limited to the method described in the description of Fig. 2 . That is, the obtained integral value 分 of the spectral illuminance and the integral value of the set pure illuminance Υt匕' may not be based on the obtained integral value X of the astigmatism illuminance and the set illuminating illuminance. The difference between the integral values γ may not be based on the absolute value. For example, the ratio of the difference between the integral value X of the obtained spectral illuminance and the integrated value γ of the set spectroscopy (four) illuminance to the integrated value γ of the set spectroscopy illuminance may be below a certain threshold or above a certain threshold. For example, a comparison of 5% or less or +5% or more may be performed based on the ratio of the integral value of the obtained astigmatism illuminance χ to the integral value γ of the set spectroscopy (four) illuminance below a certain threshold or above a certain threshold. For example, comparison is made below 95% or above 105%. The above threshold is not limited to 5% (or -5%, 95%, etc.), and may be a lower value, such as 1% or 3%, or a higher value, such as 7% or 1%. The value between the upper side and the lower side may also have different values (for example, _3% or less or 7% or more). [Formula 1] Ιχ-Υ|χΐοο I63414.doc • 18-201247399 Hereinafter, the coating step (A), the bonding step (B), and the curing step (〇, measurement step (D) constituting the method of the present embodiment are performed. And the control step (E) will be described in detail. (A) Coating step In the coating step (A), an ultraviolet curable adhesive is applied to the bonding surface of the optical films 2 and 3 to the polarizing film 1. The coater used here includes a gravure roll and a crucible 3 which are described with reference to Fig. 1. In a coater using a gravure roll, for example, a direct gravure coater, a closed type to a knife coat A cloth machine, an indirect gravure coater, an anastomotic coater using a gravure roll, a reverse roll coater composed of a plurality of rolls, etc. Further, various coaters such as the following may be used: a squeegee, a comma blade coating machine that supplies an adhesive to the coating portion and is coated with one side to be scraped off; a die coater that directly supplies an adhesive using a slit die or the like; and a reservoir is prepared. Scraper coating on one side with a blade scraping off excess liquid In the above, in consideration of the degree of freedom of film coating or track line, etc., in the coater using the gravure roll, a direct gravure coater, a closed blade coater, and an indirect gravure coater are preferred. In addition to the gravure roll, it is also the use of a die coater with a slit die. It is easy to cope with the wide toweling of the polarizing plate or to make it difficult to release the odor of the liquid supply adhesive. More preferably, it is a closed blade coater. Here, the closed blade coater is such that the gravure roll abuts against the closed scraper that absorbs the liquid paint (adhesive), and the paint in the closed scraper (Binder) transferred to the groove of the gravure roll and transferred to the coater as the optical film 2' 3 of the coated object. Designed as a small one, also known as i634l4.doc • 19· 201247399 is a micro-closed blade coater. When the adhesive is applied by a gravure roll, the thickness of the adhesive layer can be adjusted according to the speed ratio of the gravure roll to the linear velocity. "The linear velocity of the optical films 2, 3 is 10~ 50 m/min' to make the gravure roll relative to the optical film 2 3, the direction of conveyance and reverse rotation 'the rotation speed of the gravure roll is 1 〇 to 5 〇〇 m / min', whereby the coating thickness of the adhesive can be adjusted to 〇 5 to 5 μηη. Since the thickness is also affected by the void ratio of the surface of the gravure roll, it is preferred to select a gravure roll having a suitable surface void ratio in advance. Further, the gravure roll is reversely rotated with respect to the conveyance direction of the optical films 2, 3. The method is also referred to as reverse gravure printing. As described above, it is also preferred to use the first film thickness juice 14 and the second film thickness meter 15 to measure on the optical film before being bonded to the polarizing film. The thickness of the ultraviolet curable adhesive is used, and based on the measurement result, the coating thickness control mechanism of the coater is controlled in such a manner as to maintain a uniform desired thickness of the adhesive. For example, various types of spectroscopic interferometric film thickness gauges can be used which irradiate light to a coated adhesive surface and split the reflected light obtained as interference light in a specific wavelength region, according to The obtained spectral waveform chart was used to determine the film thickness. In the spectroscopic interference type film towel, there is a direct measurement, the thickness of the adhesive applied by 'i (about 5 to 5 (four) or so) (the first thickness gauge M and the second film thickness gauge 15 of Figure ^, For example) and those who cannot measure directly. In the latter case, the film thickness is set on the upstream side and the downstream side of the coater, and the total thickness of the optical film and the (four) agent is measured by the thickness of the film phase optical film itself on the upstream side, and the total thickness is measured according to the film thickness. The thickness of the adhesive can also be used. I634l4.doc '20- 201247399 (B) After the coating step (A), the bonding step (B) is performed, that is, the polarizing film is superimposed on the respective adhesive coating surfaces of the optical films 2 and 3, and Pressure. A known method can be used for the pressurization in this step, but it is preferably held by a pair of nip rolls 2, 21 from the viewpoint of being continuously pressurized while being continuously conveyed. the way. In this case, it is preferable that the timing at which the optical films 2 and 3 are superposed on the polarizing film 1 and the timing at which the optical films 2 and 3 are pressed against the polarizing film 1 by the pair of nip rolls 2 and 21 are the same. Even if they are different, the difference between the two is as short as possible. The combination of the pair of nip rolls 2, 21 may be any of a metal roll/metal roll, a metal roll/rubber roll, a rubber roll/rubber roll, or the like. The pressure at the time of pressurization is preferably about 150 to 500 N/cm when sandwiched by a pair of nip rolls 2, 21. (C) After the optical film 2 and 3 are bonded to the polarizing film 1, the laminate is bonded to the polarizing film 1 via the ultraviolet curable adhesive, and ultraviolet rays are irradiated from the external line irradiation device 16 . The ultraviolet curable adhesive is cured to produce a polarizing plate 4. When the ultraviolet rays are irradiated onto the laminate, the ultraviolet curable adhesive is applied through the optical film 2. In the example shown in FIG. 1, the laminated body is irradiated with ultraviolet rays to the laminated nip rollers 20 and 21 before and after the ultraviolet ray irradiation device 16, and the laminated nip rollers 22 and 23 are provided with a laminated body. Performed under tension. However, it is not limited to the above, as disclosed in the above-mentioned Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. Ultraviolet light is also preferred. In particular, when the heat generated by the irradiation of ultraviolet rays may adversely affect the product, it is preferable to irradiate the ultraviolet rays in a state in which the laminate is supported by the outer peripheral surface of the roller as in the latter, and at this time, the laminated body is supported. The roll is preferably temperature-adjustable in the range of about 10 to 60 C. Further, the ultraviolet irradiation device may be provided in only one irradiation site, but it is effective in that the irradiation of a plurality of light sources is formed along the flow direction of the laminate to effectively increase the amount of accumulated light. The ultraviolet light source to be used is not particularly limited, and can be used for, for example, 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 toothed lamp having a light-emitting distribution with a wavelength of 400 nm or less. Wait. When an epoxy compound is used as an ultraviolet curable component, the 'absorption wavelength shown by a general polymerization initiator is considered as an ultraviolet light source, and it is preferable to use a large number of high pressure mercury lamps having a light of 400 nm or less. Metallic paint lamp. When the ultraviolet ray is cured by irradiating ultraviolet rays with an epoxy resin as a curable component, the linear velocity of the laminate is not particularly limited, but generally, the coating step (A) or the bonding step is maintained as it is. The line speed in (B) is preferably an irradiation amount in which a tension of 1 〇〇1000 N/m is applied to the longitudinal direction of the laminate (transport direction) and the activation of the polymerization initiator is effective. The cumulative amount of light (irradiated to the total energy of the laminate) is 100 to 1500 mJ/cm2. When the total amount of light to the adhesive is too small, the curing reaction of the ultraviolet curable adhesive is insufficient, and the subsequent strength is sufficient. On the other hand, if the integrated light amount is too large, the heat radiated from the light source and the polymerization of the adhesive are generated. Heat, may cause UV curing 163414.doc

Yellowing of S-22·201247399 type adhesive and deterioration of polarizing film. In addition, when the amount of accumulated light required is achieved by one-time ultraviolet irradiation, the film may have a high temperature of more than 15 〇〇C due to heat generation. In this case, deterioration of the polarizing film may occur. In order to avoid this, as described above, it is effective to provide a plurality of ultraviolet irradiation devices along the transport direction of the film, and to perform irradiation several times. The target 'is preferable as follows: the irradiation amount of the ultraviolet irradiation device from one place is 600 mJ/cm2 or less in terms of the cumulative light amount, and finally the cumulative light amount of 100 to 1500 mj/cm2 described above can be obtained. (D) Measurement step In the measurement step, the spectral irradiance of the ultraviolet ray irradiated in the curing step (C) is measured using a spectroradiometer illuminator 7, and based on this, the specific wavelength of the absorption peak wavelength including the polymerization initiator is determined. The integral value X of the illuminating illuminance of the ultraviolet ray in the absorption wavelength region. The spectroradiometer 17 is a spectroradiometer that measures the wavelength of ultraviolet light by wavelength in the wavelength range of 220 to 800 nm by a spectrometer and measures the spectroscopic illuminance of each wavelength. The splitting can be performed by a diffraction grating, a chirp, or the like. The measurement of the spectroscopic illuminance using a spectroradiometer composed of a spectrometer is advantageous in the following aspects: 1) The spectroscopic light illuminance can be measured across a wide wavelength region, and since the measurement sensitivity of each wavelength is the same, even if In the case where the type of polymerization initiator used for the ultraviolet curing type adhesive is changed, the spectroradiometer does not need to be changed; 2) the spectroscopic illuminance of the irradiated ultraviolet light can be directly measured 'again because each wavelength The measurement sensitivity is the same, so it is possible to accurately measure the integral value of the illuminance of the ultraviolet ray of the specific absorption wavelength region 1634I4.doc •23· 201247399. The wavelength region to be integrated with the illuminating illuminance of the spectroscopic radiance is any absorption region of the wavelength range including the absorption peak wavelength of the polymerization initiator, and any wavelength region can be light of the wavelength region having a low absorbance due to the curing reaction. Small, it is preferred that the product of the spectral irradiance in the wavelength range of -40 nm to +40 nm of the absorption peak wavelength of the polymerization initiator is 'better than the absorption peak wavelength of the polymerization initiator _3 The integration of the spectral illuminance is performed in the wavelength range of 〇 nm to +30 nm. Furthermore, in the above description, the absorption peak wavelength of the polymerization initiator is _4 〇 nm to +4 〇 the wavelength region of the claw (as the wavelength region A), which may be derived from the absorption value of the polymerization initiator. The wavelength of the wavelength of 4G nm is smaller than the wavelength of the wavelength of the absorption sound value by 4 〇 _. Further, when the wavelength region to be integrated with the illuminating illuminance of the spectral radiance is, for example, in the wavelength region A, the wavelength region to be integrated as the illuminating illuminance of the spectral radiance is not limited to the wavelength region A, and is included in the wavelength region Any wavelength region including the above absorption peak wavelength. In addition, in the case of the integral value X of the illuminance (4) illuminance, the number of H persons may be one time, which is obtained based on the measurement of the illuminance of the astigmatism of the first time, but for example, if the number of measurements is one time, it is expected When the partial purity is large, the number of measurements of the astigmatism illuminance can be reduced by multiple leaf transformations (four) difference processing (four) to obtain the real _ ali score X. The product of the first radiant illuminance (E) control step obtained by the servant is in the present embodiment. 'According to the measurement step (D) described above, 163414.doc -24. 201247399, 'Setting the curing step (c) The control step (E) of controlling the output of the ultraviolet irradiation device 16. In other words, the integral value of the astigmatism illuminance obtained in the above-described measurement step is gradually lowered due to deterioration of the lamp of the ultraviolet ray irradiation device due to long-term use, or contamination of the member attached to the ultraviolet ray irradiation device due to long-term use. The tendency. Moreover, the illuminance of the ultraviolet light from the lamp is generally substantially stable within a few tens of minutes since the ultraviolet radiation is irradiated, but it is also slowly lowered due to the change of the lamp environment caused by the lamp light. The situation. This decrease in irradiance results in an offset from the expected integral value of the spectroscopic illuminance (the integral value Y of the set spectroscopic illuminance). Further, in particular, in the initial stage of ultraviolet irradiation, the voltage of the ultraviolet irradiation device is unstable, and the integral value X of the obtained spectral illuminance is higher or lower than the integral value of the desired spectral illuminance (the integral value Y of the set spectral illuminance). . In order to correct the offset, in the measuring step (D), the output of the ultraviolet ray irradiation device 16 is controlled based on the obtained integral value x of the astigmatic illuminance. For example, when the absolute value of the difference between the integrated value γ of the set spectroscopic illuminance and the integral value X of the obtained spectroscopic illuminance is 51⁄4 or more with respect to the set integral value of the spectroscopic illuminance, the difference between the two is taken as The absolute value becomes smaller, and it is preferable that the absolute value of the difference between the integrated value γ of the set spectral irradiance and the integral value X of the obtained spectral illuminance is lower than the integral value γ of the set value 2 At 5%, the electric power input to the ultraviolet irradiation device 16 is adjusted such that its output is increased or decreased. More specifically, when the integral value X of the obtained astigmatism illuminance is larger than the integral value Y of the set spectroscopy illuminance, the integral of the obtained astigmatism illuminance is reduced to be controlled by 163414.doc •25·201247399 The ultraviolet ray irradiation device 16 determines the integral value X of the astigmatism illuminance of the spectroscopy to control the ultraviolet ray device 16 in such a manner as to increase the integral value of the obtained spectroscopy illuminance i. This control can be done using a computer or manually. The integral value of the set spectroscopic illuminance is as described above, and the polarizing plate having high durability in which the polarizing film is hard to be decolored is obtained by pre-verifying that the adhesive can be cured well and even under the harsh conditions of high temperature and high humidity. The range is selected, usually in the range of 50 to 6000 mW/cm2. Within this range, the higher the integrated value of the spectral illuminance, the easier it is to produce a polarizing plate having good performance even if the linear velocity is high. When the integrated value Y of the set optical illuminance is less than 5 〇 mw/cni2, it is necessary to increase the amount of the ultraviolet ray irradiation device (such as extending the line) or increase the number of the ultraviolet ray irradiation means in order to satisfy the above-mentioned integrated light amount. Namely, since the cumulative light amount of the above-mentioned ultraviolet light is determined by the management of the productivity speed and the illuminance of the ultraviolet ray, it is also important to achieve the above-mentioned preferable integrated light amount by setting the integral value γ of the set spectroscopy illuminance within the above range. In the polarizing plate manufactured as described above, the curing reaction of the ultraviolet curable adhesive is sufficiently performed, and the reaction amount thereof is also stable, so that the bonding strength is good, and the polarizing film is hard to be decolored under the severe conditions of the south temperature and the wetness. The quality stability of the product is also excellent. [Examples] Hereinafter, the present invention will be more specifically described by showing examples and comparative examples, but the present invention is not limited by the examples. Fig. 3 is a side view schematically showing the arrangement of the apparatus used in the following examples and comparative examples, \634\4.doc •26·201247399. The arrangement shown in Fig. 3 differs from that of Fig. 1 described above only by the following points. The same reference numerals as in Fig. 1 are attached to portions other than the difference points. Therefore, a detailed description of the parts will be described with reference to Fig. 1. 3 is different from FIG. 1 : (1) When the laminated body after the first optical film 2 and the second optical film 3 are bonded to both surfaces of the polarizing film 1 is irradiated with ultraviolet rays, the laminated body is made The second optical film 3 side is in close contact with the outer peripheral surface of the irradiation winding roller 26, and the laminated body is sandwiched by the ultraviolet irradiation device 16 disposed on the opposite side of the winding roller 26, and the first optical film is laminated to the laminated body. 2 sides of the ultraviolet light. Further, as the spectroscopic illuminometer 17', a UV-curable lamp monitoring system manufactured by Otsuka Electronics Co., Ltd. was used. The spectroradiometer illuminates the spectroscopic illuminance at each wavelength using the spectrometer previously described. Then, 'the spectroscopic irradiance of the ultraviolet ray irradiated from the ultraviolet ray irradiation device 16' is measured by the same predetermined measurement interval, 'the astigmatism illuminance of each wavelength of the predetermined wavelength region is integrated' and The integral value X of the astigmatism illuminance obtained is obtained. [Example 1] (〇) Material used for the experiment In this example, as the first optical film 2, a biaxial alignment phase made of a cycloolefin resin having a thickness of 6 〇 μηι and a width of 1490 mm and supplied from a roll was used. The film "ZE0N0R" [obtained from Japan (share)]. As the second optical film 3', a propylene-based resin film having a thickness of 75 μm and a width of 1490 mm and supplied from a roll was used. The above propylene-based resin film was obtained by melting a propylene-based resin (melting point = 164 ° C) by a single-axis extruder to an extrusion temperature of 275 ° C to 275 414.doc • 27 · 201247399 degrees. The mixture was kneaded and extruded in a film form from a τ die, and adhered to a cooling roll set at 20 ° C to be cooled and solidified, and then obtained by removing the both end portions by a cutting blade. The adhesive for the polarizing film 1 and the first optical film 2, and the adhesive for the polarizing film 1 and the second optical film 3, both containing an epoxy compound and a photopolymerization initiator (absorption peak) An epoxy-based ultraviolet curable adhesive having a wavelength of 29 Å and substantially containing no solvent. (A) a coating step of adsorbing a polarizing film having a thickness of 25 μm to a polyethylene film, a ring-shaped resin film as the first optical film 2, and the above-mentioned propylene as the second optical film 3 The resin films were supplied at the line speed of 15 m/min in the same flow direction. The surface of the cycloolefin-based resin film 2 to which the polarizing film 1 is bonded is coated with a first coater 1 having a gravure roll 1 ("Micro-closed blade" manufactured by Fuji Machinery Co., Ltd.). An epoxy-based UV-curable adhesive. In addition, the second coater 12 having the gravure roll 13 (the "micro-closed scraper" manufactured by Fuji Machinery Co., Ltd.) is also applied to the surface of the propylene resin film 3 to which the polarizing film 1 is bonded. The above epoxy-based ultraviolet curable adhesive is used. The gravure roll 13 and 13 provided in the coaters 10 and 12 are reversely rotated β with respect to the film transport direction, and the first coater 10 has the rotation of the gravure roll 11 on the side of the cycloolefin resin film 2 side. The adhesive was applied to the optical film at a peripheral speed of 21 m/min at a thickness of about 2.6 μηη. The first coater 12 on the side of the propylene resin film 3 was set to have a gravureal peripheral speed of 19.5 m/min, and the adhesive was applied to the film at a thickness of about 3 Å μηη. (Β) lamination step 1634I4.doc -28-201247399 The cycloolefin-based resin film 2 and the propylene-based resin film 3 coated with the adhesive agent have their respective adhesive-coated surfaces superposed on the polarizing film 1, and are bonded by The nip rolls 20, 21 were held at a line pressure of 240 N/cm. (C) Curing step, (D) measuring step, and controlling step (E) The layered body of the cycloolefin resin film 2 / the polarizing film 1 / the propylene resin film 3 after passing through the nip rolls 20, 21 is made into a propylene system The resin film 3 side is in close contact with the outer peripheral surface of the irradiation winding roller 26 set to 20 ° C, and the same length as before the bonding is applied while applying a tension of 600 N/m in the longitudinal direction (transport direction). At a speed of 15 m/min, the laminate is wound on the laminated body of the winding member 26 for irradiation, and ultraviolet rays are irradiated from the cycloolefin-based resin film 2 side using the ultraviolet irradiation device 16 (curing step (C)). The spectroscopic luminometer 17 composed of the spectrometer measures ultraviolet light (measuring step (D)) while measuring the integral value of the illuminating illuminance of the ultraviolet ray. The spectroscopic illuminometer 17 composed of the spectrometer is set to be The spectral irradiance of the wavelength range of _30 nm to +40 nm of the absorption peak wavelength of 29 〇 nm of the polymerization initiator contained in the above ultraviolet curing type adhesive is integrated. In the above-mentioned curing step (C), as the ultraviolet irradiation device 丨6, the device manufactured by GS Yuasa is used as the ultraviolet ray lamp, and the "EHAN1700NAL high-pressure mercury lamp" is used as the ultraviolet ray lamp. The integrated value of the astigmatism illuminance in the above-mentioned wavelength region of the cover lamp is 55 mW/em2 (the integrated value of the set spectroscopy illuminance Y=55 mWW). The illuminating amount of the ultraviolet ray is 2 (four) (10) 2 in total. The adhesive layer was cured, and a polarizing plate 4 in which a ring film 2 was bonded to one surface of the polarizing film 1 and an acrylic resin crucible 3 was bonded to the other surface, and wound up in a winding 1634l4.doc -29 - 201247399 On the roller 30. In the above measurement step (D), the first shot is measured by the first shot, and the first time is set to 11 times. In milliseconds, the instantaneous value of the integral value of the instantaneous field of the above-mentioned wavelength region is measured to be output every 1 minute, and '曰# is the integral value X of the obtained spectral illuminance. ^ After the control step (8) , the product of the illuminance of the partial ray obtained in the above is a value χ When the integral value of the set spectroscopic light illuminance is changed, the W phase is lowered by 5% or more, that is, when (Υ·Χ) (10) mww, the ultraviolet ray and the radiation device 16' are output-adjusted to output 5 W per 1 box of light. Increased for the unit. The average value of the product knife value X of the spectral irradiance obtained when the _ minute operation is performed is the offset of the integral value y of the split radiance illuminance y (the average value of X) / γ (%) It is shown in Table 1 as "the shift of the integrated value of the spectral illuminance". [Comparative Example 1] In the first embodiment, the control step (Ε) is not provided, that is, even in the measurement step (D). The integral value of the illuminance of the split light illuminance is reduced by more than 5% compared with the set split light illuminating knives value ,, and the polarizing plate is not irradiated by controlling the output of the ultraviolet ray irradiation device 16. The ray plate is made for 3 minutes. The "offset of the integral value of the spectral illuminance" at the time of the operation is shown in Table i. [Example 2] A double-stretched polyethylene terephthalate having a thickness of 3 8 μηι and a width of 1330 mm was brewed.臈 is used as the first optical film 2, and has a thickness of 6 〇 μηη and a width of 163414.doc -30· 2012473 The ZEONOR, which is a biaxially oriented retardation film made of a ring-like resin of 99,130 mm, is used as the second optical film 3. As an ultraviolet curing type adhesive, an epoxy compound and a photopolymerization initiator (absorption peak wavelength) are used. (320 nm) epoxy-based ultraviolet-curable adhesive. Then, in the same manner as in Example 1, except that the (A) coating step, (B) bonding step, and (C) curing step, ( D) Measurement step and control step (E), preparing a polarizing plate. (1) In the curing step (C), the integral value of the illuminating illuminance of each of the lamps in the wavelength region shown in the following (2) For 200 mW/cm2 (the total cumulative light amount of 2 lamps is 280 mj/cm2), the ultraviolet rays are irradiated (that is, the integral value of the set spectroscopic illuminance is Y=200 mW/cm2); (2) in the measurement step (D) In the case of integrating the spectral irradiance of the wavelength region of -30 nm to +30 nm across the absorption peak wavelength of the polymerization initiator, 'the spectroscopic illuminometer 17 is set as such; and (3) in the control step (E) In the obtained integral radiance of the astigmatism radiance and the set illuminance of the astigmatism When the integral value γ is reduced by 5% or more, that is, (Y-X) 21 〇 mW/em2, the ultraviolet ray irradiation device 16 is controlled to perform an output adjustment in which the output is increased by 5 W per 1 lamp. The offset j of the integral value of the spectral illuminance at the time of the 300-minute operation is shown in Table 1. [Comparative Example 2] In the second embodiment, the control step (E) is not provided, that is, even in the measurement step (D) The obtained y ^ _ illuminance integral value X is reduced by 5% or more compared with the integral value Y of the set spectroscopy illuminance, and the ultraviolet ray irradiation device 163414.doc 201247399 16 is not controlled to perform ultraviolet ray irradiation. The polarizing plate was produced by irradiation, and the "offset value of the integrated value of the spectral illuminance" when the operation was performed for 300 minutes is shown in Table 1 [The decolorization evaluation test of the polarizing plate] was cut into 80 at any position of the obtained polarizing plate. Mm (flow direction) X is a short strip of the entire width, and the strip is cut into a width of 300-400 mm, and the plurality of small pieces thus obtained are taken as one sample, and the small pieces are adjusted to 60. °C >< 90% RH in the constant temperature / humidity device is suspended and kept for 500 hours in a state of no contact with each other. The light was transmitted through the light box while being visually compared with the polarizing plate not placed in the thermostat/humidifier to evaluate the presence or absence of light leakage. The decolorization evaluation test was performed on four samples cut at any position of the polarizing plate, and the case where no light leakage occurred in all of the four samples was set to "OK", and one or more samples of the four samples were used. When the light leakage occurred, it was set to "NG", and the results are shown in the column of "Decolorization Evaluation Results" in Table 1. The value in the brackets of the column indicates the number of samples in the four samples that caused light leakage. [Table 1] Example No. Polymerization starter absorption peak wavelength Spectroradiation illuminance integral wavelength region control step (E) Set split radiance illuminance integral value Y Split radiance illuminance integral value offset Decolorization evaluation result implementation Example 1 290 nm 260~330 nm 55 mW/cm2 2% OK(0/4) Comparative Example 1 No 9% NG(l/4) Example 2 320 nm 290-350 nm 200 mW/cm2 2% OK (0/4) Comparative Example 2 No 6% NG0/4) Note) ο κ: All samples were not leaking. NG : It was confirmed that one or more samples leaked light. 163414.doc •32·201247399 jin does not sigh the control step (8) of the comparative example] and 2, the purple line of the split surface shot Zhao; "Eight to eight * shot..., the value of the knife value is greatly reduced, with this, The obtained light plate is decolored in a severe environment, and in contrast, the integral value X of the spectral radiance obtained by the control step in the characteristic wavelength region is set. In addition, in the case of changing the integral value of the illuminance 丫 by 5% or more, the ultraviolet ray irradiation output is changed by 5% or more, and compared with the set knive value γ of the set spectroscopy illuminance. The variation of the average value of the integral value X of the spectroscopic illuminance (the shift of the integrated value of the illuminance of the knife illuminance) is suppressed to within 5%, and a polarizing plate which does not decolorize in a severe environment can be manufactured. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic side view showing an arrangement example of a manufacturing apparatus to which the present invention is applied. Figure 2 is a block diagram showing one of the relationships between the steps of the present invention. Fig. 3 is a schematic side elevational view showing the arrangement of the manufacturing apparatus used in the embodiment. [Main component symbol description] 1 polarizing film 2 first optical film 3 second optical film 4 polarizing plate 10 first coater 11 gravure roll 12 second coater 13 gravure roll 163414.doc -33- 201247399 14 first Film thickness meter 15 Second film thickness meter 16 Ultraviolet irradiation device 17 Spectroradiometer illuminator 20 ' 21 Laminating roller 22' 23 Coiling front nip roller 24 Guide roller 26 Irradiation winding roller 30 Winding roller 163414.doc -34-

Claims (1)

201247399 VII. Patent Application Range: 1. A method for manufacturing a polarizing plate, which is a method for manufacturing a polarizing plate, and comprising the following steps: (A) coating an ultraviolet curing film comprising a polymerization initiator on an optical film made of a thermoplastic resin. (B) a polarizing film made of a polyvinyl alcohol-based resin is laminated on the ultraviolet-curable adhesive-coated surface of the optical film, and the optical film is pressed against the polarizing film to obtain the polarizing film and (C) the ultraviolet ray-curable adhesive is cured by irradiating the laminated body with ultraviolet rays from the ultraviolet ray irradiation device; (D) measuring the ultraviolet ray of the irradiation using a spectrometer; The illuminance of the radiant radiance, the integrated value of the illuminating illuminance in the specific absorption wavelength region including the absorption peak wavelength of the polymerization initiator; and (E) the integral value γ according to the set spectroscopic illuminance and the above Obtain the integral value of the illuminance of the knives of the knives and the above-mentioned ultraviolet ray irradiation equipment. 2. The polarizer of the requester a method for producing a method in which the ratio of the absolute value of the difference between the integral value X of the illuminance and the value Y of the spectral irradiance of the above-mentioned illuminance is determined by the ratio of the absolute value of the illuminance of the spectroscopic illuminance When the value is higher than the above, the ultraviolet light irradiation is controlled. 3. The manufacturing method of the polarizing plate of claim 1, the integral value X of the illuminance of the optical radiance and the product of the above-mentioned illuminance of the spectral illuminance obtained by the above-mentioned I63414.doc 201247399 When the ratio of the absolute value of the difference of the values Y to the product knurling value γ of the spectral irradiance illuminance set as described above is 5% or more, the ultraviolet ray irradiation device is controlled. 4. The method of producing a polarizing plate according to any one of claims 1 to 3, wherein the specific absorption wavelength region is from a wavelength smaller than the absorption peak wavelength by 4 〇ηηι to a wavelength larger than the absorption peak wavelength by 4 〇 nm. Within the wavelength range up to the wavelength. 1634l4.doc