TW201621365A - Method for manufacturing sheet-like polarizing plate - Google Patents

Abstract

The present invention provides a method for manufacturing sheet-like polarizing plate that comprises: a step of preparing a first sheet-like polarizing plate containing a polarizer and a protecting film laminated on at least one surface of the polarizer which is a rectangular sheet-like polarizing plate having long sides and short sides, the first sheet-like polarizing plate having one or more wrinkle defects on at least one of the long sides; a step of obtaining a second sheet-like polarizing plate by slitting and removing ends of the long sides with wrinkle defects in the first sheet-like polarizing plate.

Description

Method for manufacturing polarizing plate sheet

The present invention relates to a method of manufacturing a polarizing plate sheet suitable for use in a video display device such as a liquid crystal display device.

A polarizing plate used in an image display device such as a liquid crystal display device generally has a laminated structure in which a protective film is bonded to one surface or both surfaces of a polarizer via an adhesive layer, and a long polarizing plate and a long strip shape are used. The protective film is produced by a roll-to-roll method as a long-length article (a polarizing plate roll) [for example, JP-A-2009-134190 (Patent Document 1)]. The obtained long polarizing plate is cut into a sheet-like body having a predetermined size in accordance with the screen size of the image display device, and laminated on an image display element such as a liquid crystal cell using an adhesive layer or the like. Up and combined in the image display device.

Patent Document 1 describes a method for suppressing the problem of so-called reverse curl and waveform curl generated in a polarizing plate by laminating a long polarizing film and a long protective film via an adhesive. Obtaining a laminated body, and then forming an arc along the longitudinal direction of the laminated body The laminate is adhered to one another on the convex curved surface, and the adhesive is polymerized and cured.

[Previous Technical Literature]

(Patent Literature)

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2009-134190

According to the method described in Patent Document 1, it is possible to suppress the occurrence of the above problem immediately after the production of at least a long polarizing plate or just cutting the sheet into a sheet-like body. However, the polarizing plate (polarizing plate sheet) which has been cut into a sheet-like body does not have the above-mentioned problem at the initial stage, but a waveform defect may occur during storage due to moisture absorption through the storage environment. The "waveform defect" refers to a deformation defect in which at least one side of the sheet of the polarizing plate and the end portion including the wave are undulated. When a wave defect is generated in the polarizing plate sheet, for example, when the liquid crystal display device is used as an example, when the polarizing plate sheet is bonded to the liquid crystal cell via the adhesive layer, the adhesive layer and the liquid crystal cell The bonding interface is particularly easy to mix air bubbles in the end region of the bonding interface and its vicinity. When this bubble is generated in the image display area of the liquid crystal panel, it becomes a bright spot at the time of lighting, and the visibility of the liquid crystal display device is lowered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a polarizing plate sheet having a reduced number or height of waveform defects.

The present invention provides the following method for producing a polarizing plate sheet Method of making.

[1] A method for producing a polarizing plate sheet, comprising the steps of: preparing a first polarizing plate-like body, wherein the first polarizing plate-like system includes a polarizing plate and a layer on which at least one side of the protective layer is protected. The film is a polarizing plate sheet having a square shape having a long side and a short side, and has one or more waveform defects in at least one of the long sides; and the inclusion of the first polarizing plate sheet has the above-described The end portion of the long side of the waveform defect is cut and removed to obtain a second polarizing plate sheet.

[2] The production method according to the above [1], wherein, in the step of preparing the first polarizing plate sheet, at least one of the long sides has a waveform defect of four or more.

[3] The production method according to the above [1], wherein, in the step of preparing the first polarizing plate sheet, the height of the waveform defect of at least one of the long sides is more than 2 mm.

[4] The production method according to any one of [1] to [3] wherein, in the step of obtaining the second polarizing plate sheet, the first polarizing plate-like body includes the waveform The long side end of the defect is cut and removed at a width of 65 mm or more.

[5] The production method according to any one of [1] to [4] wherein The first polarizing plate sheet system includes the polarizing film, a first protective film laminated on one surface thereof via a first adhesive layer, and a second protective film laminated on the other surface via a second adhesive layer.

[6] The production method according to the above [5], wherein the first protective film and the second protective film have a moisture permeability of 30 g/(m ² ‧24 hr) or more at a temperature of 40 ° C and a relative humidity of 90%.

The production method according to the above [5], wherein at least one of the first adhesive layer and the second adhesive layer is composed of a cured product of an active energy ray-curable adhesive. .

The production method according to any one of the above aspects, wherein the first polarizing plate-like body further comprises the following (a) and (b): (a) laminated on the protective film The upper protective film, (b) an adhesive layer laminated on the polarizing plate or the protective film, and a separation film laminated on the outer surface thereof.

According to the present invention, it is possible to provide a polarizing plate sheet having a reduced number or height of waveform defects. In particular, the present invention can provide a method for producing a polarizing plate sheet, which can reduce waveform defects to a polarizing plate sheet having four or more wave defects having a height exceeding 2 mm, which further causes a waveform defect. Sufficient enough.

1‧‧‧1st polarizing plate sheet

10‧‧‧ polarizer

20‧‧‧1st protective film

30‧‧‧2nd protective film

40‧‧‧Adhesive layer

50‧‧‧Separation film

60‧‧‧Protective film

Fig. 1 is a schematic cross-sectional view showing an example of a layer configuration of a first polarizing plate sheet.

The method for producing a polarizing plate sheet of the present invention comprises the steps of: (1) preparing a first polarizing plate-like body comprising a polarizing plate and a laminate on at least one side thereof a polarizing plate sheet having a square shape of a long side and a short side, and having at least one long side having one or more waveform defects, and (2) comprising a first polarizing plate sheet The end portion of the body having the long side of the waveform defect is cut and removed to obtain a second polarizing plate sheet.

Hereinafter, each step will be described.

(1) Step of preparing the first polarizing plate sheet

The polarizing plate sheet body in which the waveform defect of the first polarizing plate sheet system is occurring and which is likely to be mixed with the bubble as described above and the visibility which is reduced as described above is specifically at least one A polarizing plate sheet having one or more waveform defects in the long side. As a result of further generating a waveform defect in the first polarizing plate sheet, it is possible to have a waveform defect having a height exceeding 2 mm in at least one long side or four or more waveform defects in at least one long side. In the polarizing plate-like sheet, the first polarizing plate-like body has four or more waveform defects in at least one long side, and any one or more of the waveform defects has a height exceeding 2 mm. Waveform defects.

The height of the waveform defect refers to the height from the plane table to the top of the waveform defect when the first polarizing plate sheet is placed on the plane table. At this time, the first polarizing plate sheet is attached to the image display element. The side of the liquid crystal cell (for example, the liquid crystal cell) is placed on the flat table. The height of the waveform defect was measured at the side (end portion) of the first polarizing plate sheet. In addition, the number of waveform defects is substantially the number of waveform defects. Specifically, when the first polarizing plate-like body is placed on a flat table, the height is 0.5 mm or more from the plane. The number of waveform defects. The number of waveform defects is also measured at the edge (end portion) of the first polarizing plate sheet.

The first polarizing plate-like body has a square shape having long sides and short sides, and is a typical rectangular shape. The length of the long side and the short side is not particularly limited, but generally, the long side of the first polarizing plate member is 700 mm or more, and the short side is 400 mm or more. The waveform defect is such that the larger the size of the first polarizing plate sheet, the more the height or the number of generated waveforms become more conspicuous. When the size (long side and/or short side) is too small, the problem of waveform defects is not easy to produce by itself. In the first polarizing plate sheet, a polarizing plate having a wave defect as described above can be produced in a process of storing and transporting a polarizing plate for producing a long product under any conditions.

In general, the first polarizing plate-like body having a waveform defect having a height of more than 2 mm or four or more waveform defects on any one long side has a large number of waveform defects on the long side opposite to the long side. Further, the first polarizing plate-like body having a waveform defect having a height of more than 2 mm or four or more waveform defects on any one long side has a waveform defect on the two short sides. Most of them are trapped. However, the waveform defects generated on the two short sides have a smaller tendency in the height and/or the number of waveform defects generated by the long side, and the waveform defects in the short side are compared with Waveform defects on the long side tend to be less likely to cause bubbles to enter. Therefore, in order to suppress the problem of air bubble incorporation and the decrease in visibility therewith, it is necessary to particularly reduce the waveform defects generated on the long side.

The layer structure of the first polarizing plate-like sheet is not particularly limited as long as it includes a protective film which is laminated on at least one surface of the polarizing plate, and the protective film can be bonded to the two-layer layer of the polarizing plate. The protective film is usually laminated on the polarizer via an adhesive layer.

The first polarizing plate sheet may have a layer (or film) other than the polarizing plate and the protective film. For example, in general, a polarizing plate for producing a long strip and a polarizing plate sheet system formed by cutting the strip are attached to an adhesive layer of an image display element (for example, a liquid crystal cell), and are formed to be laminated on the polarizing plate in advance. A polarizing plate having an adhesive layer on its surface is widely distributed on the market, but may include a first polarizing plate sheet or such an adhesive layer. When the adhesive layer is contained, a separation film (separation sheet) for protecting the surface (outer surface) is usually laminated on the outer surface of the adhesive layer.

Further, a polarizing plate for producing a long article is usually stored as a polarizing plate roll and stored or circulated. However, in order to protect the outer protective film surface during winding, a protective film is generally provided with protection. A film (surface protection film), in which case the polarizing plate is cut into a polarizing plate sheet and generally has a protective film. In this case, the first polarizing plate sheet may include a protective film laminated on the protective film.

Further, the protective film of the first polarizing plate sheet may have a hard coat layer, an antiglare layer, an antireflection layer, an antistatic layer, and the like on the outer surface (the surface opposite to the polarizer). The surface treatment layer (coating layer) of the stain layer. Further, the first polarizing plate sheet may include a layer or film having an optical function other than the polarizing plate. One example of this is a retardation film.

An example of the layer configuration of the first polarizing plate sheet is shown in Fig. 1. The first polarizing plate sheet 1 shown in Fig. 1 includes a polarizing plate 10, a first protective film 20 bonded to one surface of the polarizing film 10, and a second protective film bonded to the other surface of the polarizing plate 10. 30; an adhesive layer 40 laminated on the outer surface of the second protective film 30; a separation film 50 laminated on the outer surface of the adhesive layer 40; and a protective film 60 laminated on the outer surface of the first protective film 20. In addition to the polarizer 10 and the protective film (the first protective film 20 and the second protective film 30), it has a layer of the adhesive layer 40 and the separation film 50, a layer having the protective film 60, or an adhesive layer. 40. The layer structure of the separation film 50 and the protective film 60 is an example of a preferred layer structure of the first polarizing plate sheet. The adhesive layer 40 can be directly laminated on the polarizer 10 by omitting one of the first protective film 20 and the second protective film 30 as will be described later.

The polarizer 10 has an optical film that absorbs linearly polarized light having a vibration plane parallel to the optical axis and transmits a linearly polarized light having a vibration plane orthogonal to the optical axis, and may be, for example, uniaxially stretched or dichroic. A polyvinyl alcohol-based resin film in which a pigment is adsorbed and oriented. As the dichroic dye, iodine or a dichroic organic dye is used. The polyvinyl alcohol-based resin constituting the polarizer 10 may be, in addition to polyvinyl alcohol which is a saponified product of polyvinyl acetate, It is a vinyl alcohol-based copolymer of a saponified product of a copolymer of another monomer (for example, ethylene or an unsaturated carboxylic acid, etc.) copolymerizable with vinyl acetate. The thickness of the polarizer 10 is usually about 5 to 40 μm.

The polarizer 10 can be carried out by a method comprising the following steps. These steps are a step of uniaxially stretching a polyvinyl alcohol-based resin film, a step of absorbing a dichroic dye by dyeing a polyvinyl alcohol-based resin film with a dichroic dye, and adsorbing a dichroic dye. The polyvinyl alcohol-based resin film is treated with a boric acid aqueous solution, and the boric acid aqueous solution is treated with a water washing step. The dyeing of the dichroic dye can be carried out by immersing the film in an aqueous solution containing a dichroic dye, and the treatment with an aqueous solution of boric acid can be carried out by immersing the film in an aqueous boric acid solution.

The uniaxial stretching of the polyvinyl alcohol-based resin film can be carried out before dyeing of the dichroic dye, at the same time as dyeing, or after dyeing. When the uniaxial extension is carried out after dyeing, this uniaxial stretching can be carried out before the boric acid treatment or in the boric acid treatment. Also, uniaxial stretching can be performed in the plural stages of these.

The first and second protective films 20 and 30 may be a translucent (ideally optically transparent) thermoplastic resin film. Specific examples of the thermoplastic resin include a polyolefin resin such as a chain polyolefin resin (such as a polypropylene resin) or a cyclic polyolefin resin (such as a decene resin); and a polyester resin (poly pair) Ethylene phthalate resin, etc.; (meth)acrylic resin (methyl methacrylate resin, etc.); cellulose resin (such as triethylene fluorene cellulose [TAC], diethyl phthalocyanine) Cellulose acetate resin, etc.; polycarbonate resin; polyvinyl alcohol resin; polyvinyl acetate resin; Polyarylate resin; polystyrene resin; polyether oxime resin; polyfluorene resin; polyamido resin; polyammonium resin; and mixtures and copolymers thereof. The thickness of the first and second protective films 20 and 30 is, for example, about 5 to 200 μm, preferably 10 to 150 μm, and more preferably 15 to 100 μm. In the present specification, "(meth)acrylic acid" means at least one selected from the group consisting of acrylic acid and methacrylic acid.

The first polarizing plate sheet 1 shown in FIG. 1 includes the first protective film 20 on one surface of the polarizer 10 and the first protective film 20 on the other surface. (2) The protective film 30 may be composed of the same type of thermoplastic resin or may be composed of a different type of thermoplastic resin. However, when the moisture permeability of the protective film applied to both surfaces is different from each other when the film is formed of a different type of thermoplastic resin, The present invention is particularly advantageous in the case where the wetness is different and waveform defects are particularly likely to occur. According to the present invention, even if the moisture permeability difference of the protective film laminated on both sides is 30 g/(m ² ‧24 hr) or more, further 50 g/(m ² ‧24 hr) or more, even 100 g/(m ² ‧24 hr) In the above, in particular, when it is 300 g/(m ² ‧24 hr) or more, a polarizing plate sheet having a problem that the waveform defects are reduced and the bubble is less likely to be mixed and the visibility is lowered can be obtained. Usually, the difference in moisture permeability of the protective film bonded to both surfaces is 900 g/(m ² ‧24 hr) or less.

The moisture permeability is measured at a temperature of 40 ° C and a relative humidity of 90% by a cup method as defined in JIS Z 0208. The combination of the protective film having a temperature difference of 40° C. and a relative humidity of 90% and having a moisture permeability difference of 30 g/(m ² ‧24 hr) or more may, for example, be a cellulose resin film (such as a TAC film) and a cyclic polyolefin. A combination of a resin, a combination of a cellulose resin film (such as a TAC film) and a (meth)acrylic resin film, a combination of a cyclic polyolefin resin and a (meth)acrylic resin film, and the like. Further, even if the thermoplastic resin constituting the protective film bonded to both surfaces is of the same type, there is a difference in moisture permeability due to the presence or absence of the surface treatment layer deposited on the surface.

The polarizer 10 and the first protective film 20 and the second protective film 30 can be bonded together via an adhesive layer. As the adhesive for forming the adhesive layer, a water-based adhesive, that is, an adhesive which can be dissolved in water or dispersed in water, or an active energy ray-curable adhesive can be used.

The adhesive component of the aqueous adhesive may be, for example, a polyvinyl alcohol resin or a urethane resin. The active energy ray-curable adhesive may be, for example, an active energy ray-curable compound containing an epoxy compound or a (meth)acrylic compound, and a curable composition of a polymerization initiator. The active energy ray-curable adhesive may be a solventless type of adhesive, but may also contain an organic solvent. If a solventless type of adhesive is used, there is no need for a drying treatment to remove the solvent. When an active energy ray-curable adhesive is used, the protective film is bonded to the adhesive layer, and then an active energy ray such as visible light, ultraviolet light, X-ray, or electron beam is irradiated, and it is preferable to irradiate the ultraviolet light to form an adhesive layer. hardening. Then, in this case, the adhesive layer of the first polarizer sheet-like body contains a cured product of an active energy ray-curable adhesive.

The first polarizing plate sheet 1 shown in Fig. 1 is biased When the first protective film 20 is provided on one surface of the optical sheet 10 and the second protective film 30 is provided on the other surface, the first adhesive layer of the first protective film 20 and the second protective film 30 are bonded to each other. The agent layer may be formed of the same type of adhesive or may be formed of a different type of adhesive, but it is preferably formed of the same kind of adhesive from the viewpoint of production efficiency.

When at least one of the first adhesive layer and the second adhesive layer (preferably both) contains a cured product of an active energy ray-curable adhesive, waveform defects due to moisture absorption are particularly likely to occur. The invention is particularly advantageous in such situations.

Examples of the adhesive constituting the adhesive layer 40 for bonding an image display element (for example, a liquid crystal cell) include a (meth)acrylic adhesive, an urethane adhesive, and an oxygen-based adhesive. Agent, polyester-based adhesive, polyamine-based adhesive, polyether adhesive, fluorine-based adhesive, rubber-based adhesive, and the like. Among them, a (meth)acrylic adhesive is preferably used from the viewpoints of transparency, adhesion, reliability, reworkability and the like. The thickness of the adhesive layer 40 is usually 2 to 40 μm.

The separation film 50 and the protective film 60 are provided for the purpose of temporarily protecting the adhesive layer 40 and the first protective film 20 when the polarizing plate is stored/carried or inspected. The separation film 50 of the protective pressure-sensitive adhesive layer 40 is actually peeled off immediately after being used for the second polarizing plate sheet to be described later (for example, bonded to a video display element such as a liquid crystal cell). Further, the protective film 60 is usually used after the second polarizing plate sheet is used (for example, in a video display element such as a liquid crystal cell), The adhesive layer is peeled off.

The separation film 50 is usually composed of a thermoplastic resin film which is subjected to release treatment on one side, and the release-treated surface is bonded to the adhesive layer 40. Further, the protective film 60 is usually formed by providing an adhesive layer on one surface of a thermoplastic resin film. The thermoplastic resin constituting the separation film 50 and the protective film 60 may be, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, such as polyethylene terephthalate or polyethylene naphthalate. Polyester resin, etc. Regarding the adhesive layer contained in the protective film 60, the related description of the above-mentioned adhesive layer 40 is cited.

The layer configuration of the first polarizing plate sheet is not limited to the one shown in Fig. 1, and may be, for example, a layer configuration as described below.

[a] The configuration of any one or more of the adhesive layer 40, the separation film 50, and the protective film 60 is omitted, and [b] the configuration of either the first protective film 20 and the second protective film 30 is omitted, and [c] is used as The optical compensation film of the second protective film 30 such as a retardation film, [d] has an optical compensation film such as a retardation film in addition to the first protective film 20 and the second protective film 30.

An example of the above [b] is a configuration in which the second protective film 30 is omitted. In a preferred embodiment, the adhesive layer 40 is directly laminated on the surface of the polarizer 10 opposite to the first protective film 20 to form a protective film. 60/first protective film 20/polarizer 10/adhesive layer 40/separation film The layer of 50 is the constructor.

A preferred embodiment of the above [c] is a layer constitution of the protective film 60 / the first protective film 20 / the polarizer 10 / the retardation film (second protective film 30) / the adhesive layer 40 / the separation film 50. A preferred embodiment of the above [d] is a layer constitution of the protective film 60 / the first protective film 20 / the polarizer 10 / the second protective film 30 / the retardation film / the adhesive layer 40 / the separation film 50. In this case, the second protective film 30 and the retardation film can be bonded to each other via, for example, an adhesive layer.

The retardation film is an optical film having optical anisotropy such as uniaxial or biaxial, and may be, for example, a stretched film of a thermoplastic resin. The thermoplastic resin may be a polyvinylidene fluoride/polymethyl methacrylate copolymer, a liquid crystal polyester or an acetonitrile fiber, in addition to the above-described examples of the first and second protective films 20 and 30. a saponified product of an ethylene-vinyl acetate copolymer, polyvinyl chloride or the like. The stretching ratio is usually about 1.01 to 6 times.

(2) Step of obtaining the second polarizing plate sheet

In this step, the long-side end portion (including the end portion having the long side having the waveform defect) of the first polarizing plate-like body having one or more waveform defects in at least one of the long sides is cut and removed. And the step of obtaining the second polarizing plate sheet having the waveform defect reduced. At the time of cutting, a conventionally known cutting (cutting) means such as a shear cutter can be used.

The first polarizing plate sheet body comprises a protective film 60 laminated on the protective film, and/or a layer deposited on the polarizing plate 10 or the protective film. When the coating layer 40 and the separation film 50 of the outer surface layer thereof are separated from each other, the first polarizing plate-like body having a wave defect at the end portion (particularly, the long-side end portion) is blackened with the color of the end portion. There is a phenomenon of poor appearance. Further, the poor adhesion should be caused by the stress at the occurrence of the waveform defect, at the interface between the thermoplastic resin film and the adhesive layer constituting the protective film 60, or at the interface between the separation film 50 and the adhesive layer 40 to cause the surface of the adhesive layer. Caused by rough. In particular, when the surface of the adhesive layer 40 is rough, if it is bonded to the image display element of the liquid crystal cell, a defective appearance may remain.

According to this step, if the cut-and-removal portion is removed by attempting to remove the defective portion, it is possible to obtain a polarizing plate-like sheet having a good quality appearance on the color tone surface.

The slit removal is performed at the end of the long side having the above-described waveform defect. In particular, among the first polarizing plate-like bodies having a waveform defect having a height of more than 2 mm or a waveform defect of four or more in any one of the long sides, many of them are also in the same length on the long side opposite to the long side. Waveform defects, typically, are cut and removed for the long side ends of both sides.

The width W1 of the long-side end portion that has been cut and removed has a waveform defect having a height of more than 2 mm or a polarizing plate-like body having four or more waveform defects in at least one of the long sides, thereby reducing the waveform defect From the viewpoint of effect, each single end portion is preferably 65 mm or more. It is to be noted that, as long as the first polarizing plate-like body has the above-described general dimensions (the long side is 700 mm or more and the short side is 400 mm or more), the slit width W1 is preferably 65 mm or more regardless of the size. Remove the long end, A good reduction in waveform defects can be obtained. From the viewpoint of more effective reduction of the waveform defect, the slit width W1 of each individual end portion is preferably 70 mm or more, more preferably 80 mm or more, still more preferably 100 mm or more, and particularly preferably 140 mm or more.

As described above, the waveform defects generated in the two short sides have a small tendency in the height and/or the number of waveform defects generated by the long sides, and, due to the waveform defects in the short sides, Compared with the long side waveform defect, there is a tendency that bubbles do not easily enter, so it is not necessary to cut the short side end, but in order to reduce the waveform defect in the short side, except for the long side end where the waveform defect is generated In addition to the portion, the short side end (single end or both end portions) where the waveform defect is generated may be cut and removed. The slit width W2 of the short side end portion of each individual end portion may be, for example, 35 mm or more, preferably 40 mm or more, more preferably 45 mm or more.

Further, regardless of whether or not a short-side end portion has a wave defect, one or both of the short-side end portions are cut and removed, and the second polarizing plate-like sheet having a reduced size can be obtained from the first polarizing plate-like body. As a specific example of the size reduction, the long-side end portion and the short-side end portion of the first polarizing plate-like sheet having a size of 46 ( (long side 1031 mm × short side 585 mm) are cut and removed to obtain a 39-inch size ( In the case of the second polarizing plate-like body having a long side of 860 mm × a short side of 490 mm), or the long-side end and the short-side end of the first polarizing plate-like body having a size of 39 ( (long side 860 mm × short side 490 mm) The portion was cut and removed to obtain a second polarizing plate sheet having a size of 32 Å (long side 700 mm × short side 400 mm).

In order to reduce the size of the cut and remove, there is a height exceeding In the case of a 2 mm waveform defect or a polarizing plate sheet having four or more waveform defects, as long as the long end portion is removed by a slit width W1 of 65 mm or more per single end portion, only two cuts can be removed. One of the long end portions may be cut and removed at the long end portions of both sides. Similarly, only one of the two short-side end portions may be cut and removed, or both short-side end portions may be cut and removed.

[Examples]

Hereinafter, the invention will be more specifically described by way of examples, but the invention is not limited by the examples. In the following examples, the number and height of waveform defects are based on the following measurement methods.

(number and height of waveform defects)

The separation film 50 is faced upward, and a polarizing plate sheet body is placed on the plane table, and the number of waveform defects in the two long sides of the polarizing plate sheet body is measured (as described above, the height is determined from the plane table) Waveform defects of 0.5 mm or more.), and the height from the plane of the waveform defect. In Table 1, among the two long sides, the number and height of waveform defects in the long side of many waveform defects are described. The height of the waveform defect described in Table 1 has a plurality of waveform defects, and refers to the height of the highest waveform defect.

<Experimental Example 1>

[1] Production of the first polarizing plate sheet

A long polarizing plate having a layer structure as shown in Fig. 1 was prepared. The layer structure of the polarizing plate is a protective film 60 having a thickness of 53 μm (including a (meth)acrylic adhesive layer and a polyethylene terephthalate film) or a first protective film 20 having a thickness of 60 μm (TAC film). / polarizer 10 having a thickness of 25 μm (uniaxially stretched polyvinyl alcohol film adsorbing oriented iodine) / second protective film 30 having a thickness of 52 μm (phase difference film containing cyclic polyolefin resin) / adhesive layer having a thickness of 20 μm 40 ((meth)acrylic adhesive layer)/separation film 50 having a thickness of 38 μm (polyethylene terephthalate film subjected to release treatment on one side). Each of the first protective film 20 and the second protective film 30 is an ultraviolet curable adhesive containing an active energy ray-curable adhesive (a curable compound containing a cationically polymerizable epoxy compound and a photocationic polymerization initiator). The adhesive layer of the cured product of "KR-70T" manufactured by ADEKA Co., Ltd. is bonded to the polarizer 10. Moreover, the first protective film 20 and the second protective film 30, at 40 ℃, relative humidity of 90% of the moisture permeability were ^{560g / (m 2 ‧24hr),} 5g / (m 2 ‧24hr).

A rectangular polarizing plate sheet having a size of 46 inches (long side 1031 mm × short side 585 mm) was cut out from the long polarizing plate, and then stored in an environment of 30° C. and a relative humidity of 80% for 3 days, according to the above measurement method. A first polarizing plate-like sheet having a long side with a waveform height of 3.5 mm and a number of waveform defects of five was obtained.

[2] Production of the second polarizing plate sheet (cutting and removing the long end portion)

The waveform height of the first polarizing plate sheet obtained in the above-mentioned manner was 3.5 mm, and the number of the waveform defects was five long end portions, which were removed by a slit of 10 mm using a shearing blade, and the measurement was performed after the slit was measured. 2 The height and number of waveform defects of the long side of the polarizing plate sheet. Repeat this operation until all The relationship between the slit width W1 and the waveform defect reduction effect was investigated until the slit width (cut width W1) was 170 mm. The results are shown in Table 1.

<Experimental Example 2>

In the same manner as in the above-described Experimental Example 1, a first polarizing plate sheet having a waveform height of 3.5 mm and a long side of four waveform defects of four dimensions (long side 1031 mm × short side 585 mm) was obtained. The ends of the long sides, using a shearing knife, are cut at each single end to remove 85.5 mm, and the two short ends are cut at each single end to remove 47.5 mm, resulting in size reduction. The second polarizing plate-like body having a size of 39 inches (long side 860 mm × short side 490 mm). In the second polarizing plate-like sheet, the height and the number of waveform defects in the long side of the long side of the first polarizing plate-like body having a waveform height of 3.5 mm and four waveform defects are measured. . The results are shown in Table 2.

Next, the two long end portions of the 39-inch second polarizing plate-like sheet obtained above were cut by a shearing knife to remove each single end portion by 80.0 mm, and two short ends were used. The edge portion was cut and removed at each individual end portion by 45.0 mm, whereby a second polarizing plate sheet having a size reduced to 32 Å (long side 700 mm × short side 400 mm) was obtained. In the second polarizing plate-like body, the height and the number of waveform defects corresponding to the long side of the long side of the second polarizing plate-like body having the measured waveform defect height and the number of the measured 39-inch size are measured. . The results are shown in Table 2.

1‧‧‧1st polarizing plate sheet

10‧‧‧ polarizer

20‧‧‧1st protective film

30‧‧‧2nd protective film

40‧‧‧Adhesive layer

50‧‧‧Separation film

60‧‧‧Protective film

Claims (8)

A method for producing a polarizing plate sheet includes a step of preparing a first polarizing plate-like body, wherein the first polarizing plate-like body includes a polarizing plate and a protective film laminated on at least one surface thereof a polarizing plate-like body having a square shape of a long side and a short side, and having one or more waveform defects in at least one long side; and the first polarizing plate-like body including the waveform defect The end portion of the long side is cut and removed to obtain a second polarizing plate sheet. The manufacturing method according to the first aspect of the invention, wherein in the step of preparing the first polarizing plate sheet, the number of waveform defects included in at least one of the long sides is four or more. The manufacturing method according to the first or second aspect of the invention, wherein, in the step of preparing the first polarizing plate sheet, the height of the waveform defect of the at least one long side is more than 2 mm. The manufacturing method according to any one of the first to third aspect, wherein the first polarizing plate sheet is provided with the waveform described above in the step of obtaining the second polarizing plate sheet. The end of the long side of the defect is cut and removed at a width of 65 mm or more. The manufacturing method according to any one of claims 1 to 4, wherein the first polarizing plate-like system includes the polarizing film, and the first layer on the one surface of the polarizer The protective film and the second protective film laminated on the other surface via the second adhesive. The manufacturing method according to claim 5, wherein the first protective film and the second protective film have a moisture permeability of 30 g/(m ² ‧24 hr) or more at a temperature of 40 ° C and a relative humidity of 90%. The production method according to the fifth or sixth aspect of the invention, wherein at least one of the first adhesive layer and the second adhesive layer is made of a cured product of an active energy ray-curable adhesive. The manufacturing method according to any one of the first to seventh aspects, wherein the first polarizing plate-like body further comprises at least one of the following (a) and (b): (a) the laminated layer is a protective film on the protective film, (b) an adhesive layer laminated on the polarizing plate or the protective film, and a separation film laminated on the outer surface thereof.