JP2000321430A - Polarizing plate and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polarizing plate with a high polarization degree having excellent moisture and heat resistance for a long period with requiring a complicated structure, and to obtain a method for the production of this plate. SOLUTION: This polarizing plate is obtd. by laminating a protective layer essentially consisting of a cyclic olefin resin with an interposed adhesive layer on at least one surface of a PVA polarizing film. A mixture of a polyvinylalcohol adhesive and a two-liquid adhesive (e.g. an adhesive essentially consisting of an acrylic main agent and an isocyanate hardening agent) is used for the adhesive of the polarizing, plate or, the adhesive layer consists of a laminated structure of a polyvinylalcohol adhesive layer and a two-liquid adhesive layer. The polarizing film and the protective film are laminated while the source liquid of the adhesive is not completely dried.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high polarization degree polarizing plate having excellent long term wet heat resistance and excellent optical properties, and more particularly to a high polarization degree polarizing plate useful for a liquid crystal display (LCD).

[0002]

2. Description of the Related Art Conventionally, a polarizing plate having a high degree of polarization has a polarizing film in which iodine or a dichroic dye is adsorbed and oriented on a polyvinyl alcohol (hereinafter referred to as PVA) film, and a triacetyl acetate film (hereinafter referred to as a protective film). , TAC) were generally laminated in a state where an aqueous solution of a PVA resin as an adhesive had an undried or semi-dried fluidity. Such a simple lamination method is possible because T
The water absorption of AC is as large as 3 to 6%, and the water existing immediately after lamination is a polarizing film (water absorption is generally 3 to 7%) and TA.
C and is eventually evaporated from its surface. As described above, TAC has an advantage due to a high water absorption, but also has a moisture permeability of 400 to 600 g / m ^2.
Due to the large day, the polarization performance of the polarizing plate using TAC as a protective film under a high temperature and high humidity environment was significantly reduced.

For this reason, a polarizing plate using a film made of a resin having low moisture permeability as a protective film has been proposed. For example,
JP-A-5-212828 discloses a composite sheet characterized in that a thermoplastic saturated norbornene resin sheet having low moisture permeability is laminated on at least one surface of a PVA sheet via an acrylic pressure-sensitive adhesive, and then heated and pressed. Is disclosed. JP-A-10-130402 discloses a polymer film having a low moisture permeability, preferably a polymer film made of a thermoplastic norbornene-based resin having an aromatic ring-containing monomer unit binding amount of 20% by weight or more. .

However, the protective film disclosed in each of the above publications lacks water absorbency and resistance to certain solvents.
The method of attaching the A-polarizing film and the protective film is complicated and inferior in productivity to the case of TAC. That is, JP-A-5-212828 discloses (1) a method of attaching using an aqueous emulsion type acrylic pressure-sensitive adhesive (2) PV
A method in which a solvent-type acrylic pressure-sensitive adhesive is applied to the A sheet, the solvent is volatilized, and the sheet is adhered to a thermoplastic saturated norbornene-type sheet. (3) Ester, ketone, alcohol, etc. such as ethyl acetate and methyl ethyl ketone Using an acrylic pressure-sensitive adhesive that is a poor solvent for the thermoplastic norbornene-based resin of which the acrylic pressure-sensitive adhesive is soluble (4) A solvent-type acrylic pressure-sensitive adhesive is used for a release film (separator), etc. After applying and volatilizing the solvent, a method of transferring to a thermoplastic saturated norbornene-type resin sheet and sticking it to a PVA sheet is adopted. The coating thickness of the acrylic pressure-sensitive adhesive is 10 to 50 μm,
In any of the methods (1) to (4), after coating, the solvent or water is heated (for example, in the case of a solvent, 60 to 110 after coating).
At 1 ° C. for 1 to 5 minutes), then the PVA sheet and the thermoplastic saturated norbornene-type resin sheet are bonded together, heated in a temperature range of 50 to 120 ° C., kept for 1 to 5 minutes, and then 1 to 10 kg / Adhesion is performed by pressing at cm ² .

In Japanese Patent Application Laid-Open No. 10-130402, an acrylic pressure-sensitive adhesive is applied to a thickness of 20 μm on a surface of a release film using a bar coater, and dried at 80 ° C. for 2 minutes to form a polymer film. Transferred to both sides of the PVA polarizing film,
An example discloses a method in which the polymer film is attached via an acrylic pressure-sensitive adhesive layer, held at 90 ° C. for 2 hours, and bonded by applying a pressure of 5 kg / cm ² .

Japanese Patent Application Laid-Open No. 8-5836 discloses a method for avoiding such a complicated laminating method. This is because a protective film (for example, TAC) having a large water absorption is provided on both sides or one side of the PVA polarizing film, and the PVA polarizing film / TAC is used.
A method is disclosed in which bonding is performed by the same method as the laminating method (as an adhesive, a polyvinyl alcohol-based resin, acrylic resin, urethane-based resin, etc.), and furthermore, a protective film having low moisture permeability is bonded on the protective film. .

[0007]

The liquid crystal display (L)
In recent years, CDs have been increasingly improved in image quality, and their applications have also been diversified. For example, in the case of an in-vehicle use, use in a high-temperature and high-humidity environment is assumed, and therefore, a polarizing plate used for the same is required to have severe humidity and heat resistance.

However, Japanese Patent Laid-Open No. Hei 5-212
No. 828 and Japanese Patent Application Laid-Open No. 10-130402 disclose that although the adhesive strength between the polarizing film and the protective film is quite high, the wet heat resistance over a long period is not sufficient. Similarly, Japanese Patent Application Laid-Open No. 8-5836 is not sufficiently resistant to moisture and heat over a long period of time, and requires a protective film and a protective film. It is hard to say that there is sexuality.

A first object of the present invention is to provide a polarizing plate having a high degree of polarization, which does not require a complicated structure and has excellent wet heat resistance over a long period of time.

A second object is to provide a specific manufacturing method that solves the first problem without requiring complicated steps.

[0011]

According to the present invention, as a means for solving the above problems, a protective film mainly composed of a cyclic olefin resin is laminated on at least one surface of a PVA polarizing film via an adhesive layer. Wherein the adhesive is a polarizer that is a mixture of a polyvinyl alcohol-based adhesive and a two-component adhesive.

Further, the two-liquid type adhesive is characterized in that it is an adhesive containing an acrylic main agent and an isocyanate-based curing agent as main components.

[0013] The present invention is also directed to a method for producing a polarizing plate, which comprises a step of laminating a polarizing film and a protective film in a state where the stock solution of the adhesive is not completely dried.

Further, in a polarizing plate comprising a protective film mainly composed of a cyclic olefin resin laminated on at least one surface of a PVA polarizing film via an adhesive layer, the adhesive layer is formed of a polyvinyl alcohol-based adhesive. It is a polarizing plate which is a layer having a laminated structure of an agent layer and a two-liquid type adhesive layer.

Further, the two-part adhesive is characterized in that it is an adhesive mainly composed of an acrylic main agent and an isocyanate-based curing agent.

Further, the present invention relates to a method for producing a polarizing plate, which comprises a step of laminating a polarizing film and a protective film in a state in which a stock solution of a polyvinyl alcohol-based adhesive or a stock solution of a two-component adhesive is not completely dried. Features.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The polarizing film of the present invention is produced by uniaxially stretching a film made of polyvinyl alcohol or a derivative thereof, adsorbing iodine, treating with boric acid water, and drying under tension. You. Alternatively, it can be obtained by immersing a film made of polyvinyl alcohol or a derivative thereof in an aqueous solution of iodine to adsorb iodine, orienting uniaxially in boric acid water, and drying under tension. Instead of iodine, a polarizing film using a dichroic dye such as an azo, anthraquinone, or tetrazine dye is similarly produced. The polarization degree of the polarizing film thus obtained is preferably 90.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.

The cyclic olefin-based resin of the present invention is a general generic name. Specifically, (a) a polymer obtained by hydrogenating a ring-opening (co) polymer of a cyclic olefin as required,
(B) an addition (co) polymer of a cyclic olefin, (c) a random copolymer of a cyclic olefin and an α-olefin such as ethylene or propylene, or (d) an unsaturated carboxylic acid or (a) to (c). Examples thereof include a graft-modified product modified with a derivative thereof. The cyclic olefin is not particularly limited, and examples thereof include norbornene and tetracyclododecene. Various known additives such as an ultraviolet absorber, an anti-blocking agent, a lubricant, an antistatic agent and a stabilizer may be added to the cyclic olefin resin for the purpose.

The method for obtaining the protective film from the cyclic olefin-based resin is not particularly limited. For example, a method utilizing thermoplasticity such as an extrusion method or a calendering method may be used. From the viewpoint of orientation and the like, a production method by a solution casting method is more desirable.

Examples of the solvent used in the solution casting method include alicyclic hydrocarbons such as cyclohexane and cyclohexene and derivatives thereof, and aromatic hydrocarbons such as toluene, xylene and ethylbenzene and derivatives thereof. One type of solvent may be used, but it may be difficult to obtain a smooth film depending on the solution viscosity and drying conditions. At that time, a desirable film can be obtained by adding a leveling agent to the liquid or by using at least two kinds of mixed solvents having a difference in boiling point of 10 ° C. or more. The thickness of the protective film is usually 5-150μ.
m, preferably 10 to 100 μm, more preferably 2
0 to 60 μm is desirable. If the thickness is too thin, it is difficult to handle, and if it is too thick, the standing time after lamination described later tends to be long.

In order to improve the adhesiveness to the polarizing film and the adhesive to adhere to the liquid crystal substrate, the surface of the protective film is subjected to corona discharge treatment, ozone spraying, ultraviolet irradiation, flame treatment, chemical treatment, and the like. Chemical treatment and other known surface treatments may be applied. For treatment degree, wetting tension is 40 dyn / cm
As described above, the density is preferably 50 dyn / cm or more, more preferably 55 dyn / cm or more.

The polyvinyl alcohol-based adhesive of the present invention comprises a resin obtained by saponifying a vinyl acetate resin as a main component, and preferably has a saponification degree of 70 to 9
9% and a polymerization degree of 200 to 3000. For the purpose, other monomers such as acrylic acid, crotonic acid, itaconic acid and the like are copolymerized by about several mol%, and, for example,
It may be modified with an alkyl group, an epoxy group or the like.

The two-part adhesive of the present invention comprises:
There is no particular limitation as long as the curing agent is made of a curing agent that reacts with the main agent to cure, and examples thereof include an epoxy-based, urethane-based, and acrylic-based adhesive. From the viewpoint of wet heat resistance, an acrylic adhesive composed of an acrylic main agent having a functional group which reacts with an isocyanate group, for example, an acrylic main agent obtained by copolymerizing acrylic acid and the like, and an isocyanate-based curing agent is most preferable.

One embodiment of the present invention relates to a polarizing plate comprising a protective film mainly composed of a cyclic olefin resin laminated on at least one surface of a PVA polarizing film via an adhesive layer. As a polyvinyl alcohol adhesive and 2
A mixture of liquid type adhesives is used. The mixing ratio is preferably such that the solid content of the polyvinyl alcohol-based adhesive is 1 to 100 parts by weight of the solid content of the two-component adhesive.
300 parts by weight, more preferably 3 to 200 parts by weight, still more preferably 5 to 80 parts by weight. The mixing ratio of the main agent and the curing agent of the two-component adhesive may be determined appropriately depending on the amount of each functional group.

In order to improve the moisture and heat resistance of the polarizing plate over a long period of time, it is important to prevent moisture from entering from the surface of the polarizing plate and to prevent moisture from entering from the end face of the polarizing plate. In the present invention, in order to prevent the ingress of moisture from the surface,
As the protective film, a protective film mainly composed of a cyclic olefin resin having very low moisture permeability is employed. Then, in order to prevent water from entering from the end face, the above-mentioned mixed adhesive is adopted as an adhesive layer.

When a mixed adhesive of a polyvinyl alcohol-based adhesive and a two-component adhesive is used as the adhesive layer, surprisingly, the long-term wet heat resistance is greatly improved. The reason is not clear, but with polyvinyl alcohol-based adhesive,
Since the moist heat resistance of the three components of the two-component adhesive main component and the curing agent is greatly improved as compared with the case of a single component or the case of a mixture of the two components, the three components have some mutual resistance. It is presumed that this is due to its action.

Another embodiment of the present invention relates to a polarizing plate comprising a protective film mainly composed of a cyclic olefin resin laminated on at least one surface of a PVA polarizing film via an adhesive layer. As the layer, a laminated structure of a polyvinyl alcohol-based adhesive layer and a two-liquid type adhesive layer is used.
As a lamination method, for example, a polyvinyl alcohol-based adhesive or a two-component adhesive is applied to a protective film mainly composed of a cyclic olefin-based resin and dried, and this surface and a PVA polarizing film are bonded to a two-component adhesive. Or a method of laminating using a polyvinyl alcohol-based adhesive. In addition,
The timing of laminating the adhesive layer may be continuous or may be after a long period such as several months later.

Even when the adhesive layer has a laminated structure as described above,
Surprisingly, the long-term wet heat resistance is greatly improved. This is presumed to be because the polyvinyl alcohol-based adhesive, the main component of the two-pack type adhesive, and the curing agent produce some kind of interaction.

The method of laminating the polarizing film and the protective film is not particularly limited, but the following method is desirable in order to improve the productivity and eliminate the generation of voids. That is, in the state of the undiluted adhesive, or semi-dry,
This is a method of laminating a polarizing film and a protective film. The adhesive stock solution may be applied to the polarizing film or to the protective film.
The lamination may be a separate step from the production of the polarizing film and the protective film, but it is more preferable to perform the lamination at the time of producing the polarizing film from the viewpoint of productivity. The production speed of the polarizing film is generally 5 to 15 m / min.

As the laminating means, any known means may be used, but it is more preferable to use a nip roll because it is simple and excellent in productivity. Examples of the nip roll include a combination of a rubber roll / metal roll and a combination of a rubber roll / rubber roll. The nip pressure is usually a linear pressure of 1 to 10
0 kg / cm, preferably 3 to 30 kg / cm.

The viscosity of the stock adhesive solution is not particularly limited.
0 to 20000 cp (centipoise), preferably 10
It is desirable to be in the range of 0 to 12000 cp. 10
When it is less than cp, when the stock solution is laminated in an undried state, it flows out due to the nip pressure, so that the thickness of the obtained adhesive tends to be extremely thin. Further, when the adhesive is applied in a semi-dried state, the time required for drying until the viscosity becomes appropriate is long, and it is hard to say that it is preferable from the viewpoint of productivity. On the other hand, if it exceeds 20,000 cp, sufficient care must be taken at the time of coating.

When the lamination is completed, the laminate is left in a roll-wound room at room temperature or at a temperature of about 40 ° C. for about 24 to 72 hours. During this time, drying and curing are completed. There is no effect on productivity because it is simply left in roll form.

[0033]

EXAMPLES Next, typical examples of the present invention will be described. The methods for measuring and evaluating the physical properties used in the present invention are as follows.

The water absorption is 23 ° C. according to ASTM D570.
X 24 hours.

The moisture permeability is determined by the Mocon method (PERM manufactured by Mocon Corporation).
ARTRAN-W600 type moisture permeability measuring device)
It measured at 90 degreeC * 90% RH.

The degree of polarization of the polarizing plate was calculated by the following method. That is, two polarizing plates are superimposed on each other so that the orientation directions are the same, and 400 n is measured using a spectrophotometer.
The average value of the light transmittance values continuously measured from m to 700 nm is defined as T1. Next, two polarizing plates are overlapped so that the orientation directions are orthogonal to each other,
The average value of the light transmittance values measured in the same manner is defined as T2. Then, the degree of polarization was calculated by the following equation (1). The larger the value, the better the polarization performance.

(Equation 1)

The single transmittance of the polarizing plate was continuously measured from 400 nm to 700 nm using a spectrophotometer.
This is the average value of the light transmittance of one polarizing plate. The larger the value, the better the transparency of the polarizing plate.

The moisture and heat resistance test of the polarizing plate was performed by
It is cut into an m-square, and the thermo-hygrostat is alternately changed to an atmosphere of 85 ° C. × 93% RH and an atmosphere of 25 ° C. × 99% RH for 12 hours, and left in the thermo-hygrostat for a total of 6000 hours. It was done by doing. The polarization degree retention is a value obtained by multiplying a value obtained by dividing the polarization degree after the test by the polarization degree before the test by 100. The higher the value, the better the resistance to moist heat.

Example 1 30 parts by weight of a cyclic olefin resin (ZEONEX 490K manufactured by Zeon Corporation) was dissolved in 70 parts by weight of xylene, and a film was formed by a casting method. Strength 100W /
Corona discharge treatment was performed at m ² · min to obtain a protective film having a thickness of 50 μm. The water absorption of this protective film is 0.01%, the moisture permeability is 3.1 g / m ² · 24 hours, and the wetting tension is 60 dyn / c.
m.

Example 2 A PVA film (Kuraray Co., Ltd. Kuraray Vinylon Film VF-9X75R, thickness 75 μm) was added to an aqueous solution comprising 5000 parts by weight of water, 35 parts by weight of iodine, and 525 parts by weight of potassium iodide for 5 minutes. It was immersed to adsorb iodine. The film is then heated to 45 ° C.
Was stretched 4.4 times in the machine direction in a 4% by weight aqueous solution of boric acid, and then dried under tension to obtain a polarizing film. Next, this polarizing film is used as an adhesive of an emulsion type two-liquid type acrylic adhesive (the main ingredient is E-Tech Emulsion AE943 manufactured by Nippon Synthetic Rubber Co., Ltd.
2% by weight), 110 parts by weight of AQUANATE 100 (solid content concentration: 100% by weight), base agent / hardener = 100/10) manufactured by Nippon Polyurethane Industry Co., Ltd., and polyvinyl alcohol 163-03045 manufactured by Wako Pure Chemical Industries, Ltd.
After dipping for 2 seconds under tension in a pan containing a mixture of 10% by weight of a 30% by weight aqueous solution (having a degree of saponification of about 88% and a degree of polymerization of about 500), the film was pulled up, and immediately obtained on both surfaces of the polarizing film in Example 1. Rubber roll / metal roll (rubber roll diameter 200 mm, metal roll diameter 350 m
m, a linear pressure of 10 kg / cm) and wound up.
The winding speed at this time was 10 m / min. The rolled material (50 m length) was left in a room at 40 ° C. for 24 hours. Table 1 shows the evaluation results of the polarizing plates thus obtained.

Example 3 30 of polyvinyl alcohol
A polarizing plate was obtained in the same manner as in Example 2 except that the weight% aqueous solution was changed to 100 parts by weight instead of 10 parts by weight. Table 1 shows the evaluation results of the polarizing plate.

(Comparative Example 1) Emulsion type two-pack type acrylic adhesive (the main ingredient is E-Tech Emulsion AE943 (solid content concentration: 52% by weight) manufactured by Nippon Synthetic Rubber Co., Ltd.), and the curing agent was Nippon Polyurethane Industry Co., Ltd. A polarizing plate was obtained in the same manner as in Example 2, except that Aquanate 100 (solid content concentration: 100% by weight), base material / curing agent = 100/10) was used. Table 2 shows the evaluation results of the polarizing plate.

(Comparative Example 2) A 30% by weight aqueous solution of polyvinyl alcohol 163-03045 (a saponification degree of about 88% and a polymerization degree of about 500) manufactured by Wako Pure Chemical Industries, Ltd. was used as an adhesive in the same manner as in Example 2. Thus, a polarizing plate was obtained. Table 2 shows the evaluation results of the polarizing plate.

[0045]

[0046]

(Embodiment 4) An emulsion-type two-pack type acrylic adhesive (AP-P9739- manufactured by Chuo Rika Kogyo Co., Ltd.) was applied to one surface of the protective film obtained in Example 1.
3 (solid content: 55% by weight), and a hardener coated by GL-P9908 (solid content: 100% by weight, main agent / hardener = 100/10) manufactured by Chuo Rika Kogyo Co., Ltd. to a thickness of 5 μm. Then, it was dried with hot air and wound up.

Example 5 A PVA film (Kuraray Co., Ltd. Kuraray vinylon film VF-9X75R, thickness 75 μm) was heated with a heated metal roll / heated metal roll (temperature: 110 ° C., diameter: 350 mm, pressure: 3.8 t). By rolling between the three, it is 3.4 times longer (in terms of thickness) in the longitudinal direction.
The film is axially stretched, and then the width of both ends of the film is trimmed by about 10 mm. Then, the film is further stretched 1.2 times (thickness conversion) between a heated metal roll / a heated metal roll (temperature: 110 ° C., diameter: 350 mm, pressure: 3.8 t). ), Then immersed in an aqueous solution of iodine (a solution of 90 g of iodine and 1440 g of potassium iodide in 18000 g of water) placed in a pan under tension for 30 seconds, and drained with a draining roll. Then, a 60 ° C. boric acid aqueous solution (water 6
000 g, a solution prepared by dissolving 300 g of boric acid, 1.5 g of iodine and 24 g of potassium iodide) for 5 seconds under tension.
Draining was performed with a draining roll, and then drying was performed with cold air under tension (this resulted in a polarizing film).

Next, polyvinyl alcohol 163-0304 manufactured by Wako Pure Chemical Industries, Ltd., in which the polarizing film was put in a pan
5 (Saponification degree: about 88%, polymerization degree: about 500) 30% by weight
After being immersed in an aqueous solution under tension for 2 seconds, the film was pulled up, and immediately with the coated surface of the protective film obtained in Example 4 on both surfaces of the polarizing film, a rubber roll / metal roll (rubber roll diameter of 20) was used.
0mm, metal roll diameter 350mm, linear pressure 10kg / c
m) and wound up. The operations from longitudinal stretching to winding were all a series of operations, and the winding speed was 10 m / min.

The rolled material (50 m long) was heated at 40 ° C.
Was left in the room for 24 hours. The initial performance of the polarizing plate thus obtained was such that the degree of polarization was 100% and the single transmittance was 44.4%.
Met. The degree of polarization retention after the moist heat resistance test was 80.
7%, and the single transmittance was 53.5%.

(Example 6) Polyvinyl alcohol 163-03045 manufactured by Wako Pure Chemical Industries, Ltd. (saponification degree: about 88%,
A protective film coated with polyvinyl alcohol was obtained in the same manner as in Example 4 except that a 30% by weight aqueous solution having a polymerization degree of about 500) was used. Next, instead of polyvinyl alcohol, an emulsion-type two-liquid type acrylic adhesive (AP-P9739-3 (main component: AP-P9739-3, solid content concentration: 55% by weight) manufactured by Chuo Rika Kogyo Co., Ltd.) and a curing agent manufactured by Chuo Rika Kogyo Co., Ltd.
GL-P9908 (solid content concentration 100% by weight),
A polarizing plate was obtained in the same manner as in Example 5, except that the curing agent was used (100/10). The initial performance of the polarizing plate is 10
0%, and the single transmittance was 44.4%. After the heat and humidity test, the polarization degree retention was 80.1%, and the single transmittance was 5%.
It was 3.6%.

[0052]

Since the present invention has the above configuration, the following effects can be obtained.

The polarizing plate of the present invention has excellent wet heat resistance,
It is the most suitable polarizing plate.

According to the production method of the present invention, it is possible to produce a polarizing plate which does not require complicated steps, has high productivity, and has good quality without bubbles.

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Claims (6)

[Claims] 1. A polarizing plate comprising a polyvinyl alcohol-based polarizing film and a protective film containing a cyclic olefin-based resin as a main component laminated on at least one surface of the polyvinyl alcohol-based polarizing film via an adhesive layer. A polarizing plate, which is a mixture of an adhesive and a two-part adhesive. 2. The polarizing plate according to claim 1, wherein the two-part adhesive is an adhesive containing an acrylic base agent and an isocyanate-based curing agent as main components. 3. The method for producing a polarizing plate according to claim 1, further comprising a step of laminating the polarizing film and the protective film in a state where the stock solution of the adhesive is not completely dried. 4. A polarizing plate in which a protective film mainly composed of a cyclic olefin resin is laminated on at least one surface of a polyvinyl alcohol-based polarizing film via an adhesive layer, wherein the adhesive layer is formed of polyvinyl alcohol. A polarizing plate, which is a layer having a laminated structure of a system adhesive layer and a two-liquid type adhesive layer. 5. The polarizing plate according to claim 4, wherein the two-part adhesive is an adhesive containing an acrylic main agent and an isocyanate-based curing agent as main components. 6. A polyvinyl alcohol-based adhesive stock solution or 2
With the liquid type adhesive stock solution not completely dried,
6. The method according to claim 4, further comprising a step of laminating a polarizing film and a protective film.
The method for producing the polarizing plate described above.