KR102244786B1 - Pretreatment of carrier film for polarizing plate, the method for manufacturing the polarizing plate-carrier film laminate and the method for manufacturing the polarizing plate - Google Patents

Abstract

The present specification relates to a pretreatment method of a carrier film for a polarizing plate to prevent blocking, a method of manufacturing a polarizing plate-carrier film laminate, and a method of manufacturing a polarizing plate.

Description

Pre-treatment method of carrier film for polarizing plate, manufacturing method of polarizing plate-carrier film laminate, and manufacturing method of polarizing plate {PRETREATMENT OF CARRIER FILM FOR POLARIZING PLATE, THE METHOD FOR MANUFACTURING THE POLARIZING PLATE-CARRIER FILM LAMINATE AND THE METHOD FOR MANUFACTURING THE POLARIZING PLATE }

The present specification relates to a pretreatment method of a carrier film for a polarizing plate, a method of manufacturing a polarizing plate-carrier film laminate, and a method of manufacturing a polarizing plate.

Conventional polarizing plates for liquid crystal display devices use a general polyvinyl alcohol-based polarizer, and a protective film such as PET is attached to at least one side of the polarizer.

In recent years, in the polarizing plate market, demands for low light leakage and thinning are increasing, and in order to satisfy this property, a method of directly forming a protective film on the polarizer is being investigated instead of applying a previously formed protective substrate.

However, when the protective film is formed directly on the existing polyvinyl alcohol-based stretch type polyvinyl alcohol-based polarizer, the polarizer is torn due to stress generated by the shrinkage of the polarizer at high temperature compared to the case of applying a protective substrate on both sides as before. It was difficult to solve the problem that occurred.

Japanese Patent Laid-Open No. 2016-130020

The present specification provides a pretreatment method of a carrier film for a polarizing plate, a method of manufacturing a polarizing plate-carrier film laminate, and a method of manufacturing a polarizing plate.

The present specification provides a pretreatment method for a carrier film for a polarizing plate including drying the carrier film for 2 minutes or more under conditions of a relative humidity of 30% or less and a temperature of 70° C. or more and 100° C. or less.

In addition, the present specification comprises the steps of preparing a carrier film processed by the above-described pretreatment method;

Supplying the carrier film to one surface of a polarizer;

Supplying a protective film to the other surface of the polarizer;

Forming a protective layer by supplying an active energy ray-curable composition between the polarizer and the carrier film;

Forming an adhesive layer by supplying a photocurable adhesive composition between the polarizer and the protective film;

Placing a pair of pressing means on each surface of the carrier film and the protective film to press the polarizing plate-carrier film laminate including the carrier film, the protective layer, the polarizer, the adhesive layer, and the protective film; And

It provides a method of manufacturing a polarizing plate-carrier film laminate comprising the step of curing the protective layer and the adhesive layer by irradiating active energy rays.

In addition, the present specification includes the steps of preparing a polarizing plate-carrier film laminate manufactured by the above-described manufacturing method; And

It provides a method of manufacturing a polarizing plate comprising the step of peeling the carrier film from the polarizing plate-carrier film laminate.

According to the pretreatment method of the carrier film for a polarizing plate according to the present specification, moisture on the surface of the carrier film for a polarizing plate can be effectively removed without a large change in optical properties, so that the carrier film and the protective layer adhere to each other when applied to the polarizing plate manufacturing process. The phenomenon can be effectively suppressed.

1 is a view showing a method of manufacturing a polarizing plate-carrier film laminate according to an exemplary embodiment of the present specification.
2 is a diagram illustrating a principle of a blocking phenomenon in the present specification.

Hereinafter, the present invention will be described.

In this specification, that two or more elements are provided sequentially, for example, the term "sequentially provided "A and B"" means that the elements A and B are arranged in the above order, but between A and B In the case where other elements are interposed, for example, A, C, and B are also included in the above order.

In addition, in the present specification, that two elements are attached to each other or directly attached to each other, for example, ``that B is directly attached to A'' means that no other element is interposed on at least one major surface of A. , May mean the case where B is directly attached.

In the present specification, the term "curing of the composition" refers to a process in which the composition is changed to exhibit adhesive or adhesive properties by a physical action or a chemical reaction of the components of the composition. In addition, the term "active energy ray" in the present specification refers to microwaves, infrared (IR), ultraviolet (UV), X-rays and γ-rays, as well as α particle beams and proton beams. , It may mean a particle beam, such as a neutron beam and an electron beam, and may be usually an ultraviolet ray or an electron beam. In addition, the "active energy ray-curable type" in the above may mean that curing as described above can be induced by irradiation with active energy rays. In one example of the present invention, the curing of the active energy ray-curable composition may be performed through free radical polymerization or cationic reaction by irradiation of active energy rays, and preferably, free radical polymerization and cationic reaction are performed simultaneously or sequentially. It can be carried out together with

In order to form a protective layer in the process of manufacturing a polarizing plate, when a composition for forming a protective layer is applied to a polarizer, the composition for forming a protective layer is provided with adhesion with other components, in order to prevent the composition from being lost. , A carrier film is provided on the composition for forming a protective layer. Thereafter, the carrier film is peeled off after curing the composition for forming a protective layer. At this time, due to the adhesion between the surface of the carrier film and the composition for forming a protective layer, a phenomenon in which a part of the carrier film is separated from the protective layer when the carrier film is peeled In other words, there is a problem that blocking occurs and the optical properties of the polarizing plate are deteriorated.

Hereinafter, the above blocking phenomenon will be described.

When the carrier film is processed, wound and distributed, when it is used or when it is exposed to heat and pressure during storage, blocking occurs between other adjacent films, causing the carrier film and adjacent films to stick together. Here, blocking refers to a property that does not slip well, and when pressure is applied in the vertical direction of the surface of a laminate of a carrier film and other films, and then pulled in opposite directions (when peeled), simple adhesion between each other It means a phenomenon in which considerable resistance occurs due to the above adhesion.

Hereinafter, the blocking phenomenon will be described in more detail with reference to FIG. 2. On the surface of the polyethylene terephthalate film (PET) that has not been separately pretreated, there is a large amount of water remaining due to moisture in the atmosphere, and hydrophilic groups such as -COOH or -OH exist due to the remaining moisture.These hydrophilic groups are the epoxy groups of the protective layer. Can react with. Referring to FIG. 2, a carboxyl group (-COOH) and a hydroxyl group (-OH) may cause a ring opening reaction of the epoxy group of the hard layer.

In addition, when the carrier film is laminated on the protective layer of the polarizing plate during the manufacturing process of the polarizing plate-carrier film laminate, since the epoxy group of the protective layer and the hydrophilic group on the surface of the carrier film easily react, blocking the protective layer and the carrier film stick to each other. The phenomenon will appear.

Particularly, if necessary, the polarizing plate-carrier film laminate may be stored for a long time. As the time in which the protective layer and the carrier film are attached increases, the above-described blocking phenomenon may be more severe.

An exemplary embodiment of the present specification was to minimize the blocking phenomenon by performing a separate pretreatment before applying the carrier film to the polarizing plate manufacturing process.

Specifically, the present specification provides a pretreatment method for a carrier film for a polarizing plate comprising drying the carrier film for 2 minutes or more under conditions of a relative humidity of 35% or less and a temperature of 70° C. or more and 100° C. or less.

In the exemplary embodiment of the present specification, the drying may be performed in an oven, and the relative humidity and temperature may mean the relative humidity and temperature of the atmosphere in the oven.

In the exemplary embodiment of the present specification, the drying step may be performed in the atmosphere outside the oven, and the relative humidity and temperature may mean the relative humidity and temperature of the atmosphere heated by another heating device. have.

In the exemplary embodiment of the present specification, the drying of the carrier film may be performed at a temperature of 60° C. or more and 100° C. or less, 70° C. or more and 90° C. or less, and preferably 75° C. or more and 85° C. or less. When the above temperature range is satisfied, while the carrier film can be effectively dried, damage to the carrier film by heat can be minimized.

In the exemplary embodiment of the present specification, the drying of the carrier film may be 2 minutes or more and 10 minutes or less, 2 minutes or more and 8 minutes or less, preferably 3 minutes or more and 5 minutes or less. When the above range is satisfied, while the carrier film can be effectively dried, it is possible to minimize damage to heat due to heat treatment of the carrier film for a long time.

In the exemplary embodiment of the present specification, the drying of the carrier film may simultaneously satisfy the above-described temperature condition and execution time condition. In this case, in addition to the above-described effects, there is an effect that the optical properties of the carrier film before and after pretreatment do not change significantly.

In the exemplary embodiment of the present specification, the pretreatment method of the carrier film for a polarizing plate may satisfy the following General Formula 1.

[General Formula 1]

In the general formula 1, Ha is an internal haze value of the carrier film before pretreatment, and Hb is an internal haze value of the carrier film after pretreatment.

In an exemplary embodiment of the present specification, the general formula 1 may be represented by the following general formula 1-1 or the following general formula 1-2.

[General Formula 1-1]

[General Formula 1-2]

When the general formulas 1, 1-1, or 1-2 are satisfied, the optical properties before and after the pretreatment of the carrier film are not significantly changed, and thus the optical properties of the polarizing plate to which the carrier film is applied may be excellent. That is, while drying the carrier film to effectively remove moisture on the surface of the carrier film, the haze value of the carrier film is not significantly changed. In addition, since it is to process the already manufactured carrier film, there is a difference from the crystallization process performed during the manufacture of the carrier film.

In the exemplary embodiment of the present specification, Ha may be 4.5% or more and 5.5% or less, preferably 4.7% or more and 5.2% or less, and more preferably 4.8% or more and 5.0% or less.

In the exemplary embodiment of the present specification, the Hb may be 4.5% or more and 5.5% or less, preferably 4.7% or more and 5.2% or less, and more preferably 4.8% or more and 5.0% or less.

The internal haze value of the carrier film may be measured by a method generally performed in the field to which this technology belongs. For example, it can be measured through a transmission mode through a Haze meter.

In the exemplary embodiment of the present specification, when the pretreatment method of the carrier film for a polarizing plate is performed, the residual amount of moisture on the surface of the carrier film may be adjusted to be less than a certain range. Specifically, P in the following general formula 2 may be 20% or less, preferably 15% or less, and more preferably 10% or less.

[General Formula 2]

In the general formula 2, W1 is the moisture content (W1) on the surface of the carrier film before pretreatment measured at 25°C, and W2 is the moisture content (W2) on the surface of the carrier film after pretreatment measured at 25°C.

When the residual amount of moisture on the surface of the carrier film is adjusted to the above range, since almost no moisture remains on the surface of the carrier film, which is the cause of the above-described blocking phenomenon, the blocking phenomenon can be minimized.

In one embodiment of the present specification, the carrier film may be a polyethylene terephthalate (PET) film. In the case of polyethylene terephthalate (PET) film, it is excellent in price and has excellent roughness on the surface of the film, so it is possible to obtain a uniform protective layer without irregularities or cracks on the cured surface during the transfer after coating the protective layer. have. In addition, it has the advantage of being less sensitive to the external environment than the TAC film due to its low moisture permeability.

In the exemplary embodiment of the present specification, prior to the drying of the carrier film, a step of cleaning the carrier film and a step of repairing the carrier film may be included. The step of cleaning the carrier film is a step of removing foreign substances on the surface of the carrier film, and the step of removing the carrier film is a step of removing moisture remaining on the surface of the carrier film in the step of washing.

In one embodiment of the present specification, the step of washing the carrier film may be washing with water of 30° C. or more and 50° C. or less, or 35° C. or more and 45° C. or less. In this case, the step of washing with water may be washing by immersing the carrier film in a thermostat. An example of the thermostat is the brand name DS-DWB45.

In the exemplary embodiment of the present specification, the step of receiving the carrier film may be removing moisture from the surface of the carrier film with a moisture absorbing sponge for water-reserving. Specifically, it may be to wipe the surface of the carrier film with the moisture absorbing sponge for water conservation.

The above-described method of pretreating the carrier film for a polarizing plate is performed before laminating the carrier film on the polarizing plate laminate.

The present specification includes the steps of preparing a carrier film processed by the pretreatment method described above;

Supplying the carrier film to one surface of a polarizer;

Supplying a protective film to the other surface of the polarizer;

Forming a protective layer by supplying an active energy ray-curable composition between the polarizer and the carrier film;

Forming an adhesive layer by supplying a photocurable adhesive composition between the polarizer and the protective film;

Placing a pair of pressing means on each surface of the carrier film and the protective film to press the polarizing plate-carrier film laminate including the carrier film, the protective layer, the polarizer, the adhesive layer, and the protective film; And

It provides a method of manufacturing a polarizing plate-carrier film laminate comprising the step of curing the protective layer and the adhesive layer by irradiating active energy rays.

The polarizing plate-carrier film laminate is used for manufacturing a polarizing plate, and may be used as a polarizing plate after undergoing a process of peeling the carrier film.

The carrier film is laminated to the protective layer of the polarizing plate during manufacture of the polarizing plate, and then peeled off and removed in the final step.

In one embodiment of the present specification, the thickness of the carrier film may be 10 μm to 150 μm, preferably 15 μm to 100 μm. When the thickness of the carrier film satisfies the above numerical range, it is possible to prevent wrinkles from occurring due to the expansion and/or contraction of the carrier film due to heat generated during UV irradiation. There is an advantage that can solve the problem that the hardened part occurs.

The protective layer may be an active energy ray-curable composition including an epoxy compound (A) and an oxetane compound (B) or a resin layer including a cured product thereof.

The protective layer may include an active energy ray-curable composition containing an epoxy compound (A) or an oxetane compound (B) in a cured state.

The active energy ray-curable composition contains 5 to 100 parts by weight, preferably 10 to 90 parts by weight, more preferably 15 to 60 parts by weight of the oxetane compound (B) based on 100 parts by weight of the epoxy compound (A) can do. When the epoxy compound and the oxetane compound are included within the above content range, it is possible to induce more effective curing of the active energy ray-curable composition, and even in the state of being irradiated with active energy rays, it is more efficient due to the living characteristics of the cationic reaction The physical properties can be improved by proceeding with curing.

In the present specification, the unit "parts by weight" means a ratio of weight between each component. By controlling the ratio of the components of the active energy ray-curable composition as described above, it is possible to provide a protective layer having excellent curing efficiency of the composition and physical properties after curing of the composition.

In the present specification, the term "epoxy compound" may mean a monomeric, oligomeric or polymeric compound including one or more, preferably two or more epoxy groups.

The epoxy compound can improve physical properties such as water resistance and adhesion of the protective layer.

As the epoxy compound, for example, one that can be crosslinked or polymerized by a cationic reaction may be used.

In one example, as the epoxy compound, an epoxy resin having a weight average molecular weight (Mw) of 1,000 to 5,000, preferably 2,000 to 4,000 may be used. In the present specification, the weight average molecular weight refers to a value converted to standard polystyrene measured by GPC (Gel Permeation Chromatograph), and unless otherwise specified, the term “molecular weight” means “weight average molecular weight”. When the molecular weight is 1,000 or more, the durability of the protective layer can be properly maintained, and when the molecular weight is 5,000 or less, workability such as coating properties of the composition can be effectively maintained.

As the epoxy compound, for example, any one or more selected from the group containing an alicyclic epoxy compound and a glycidyl ether type epoxy compound may be used.

In the exemplary embodiment of the present specification, a mixture of an alicyclic epoxy compound and a glycidyl ether type epoxy compound may be used as the epoxy compound.

In this case, the alicyclic epoxy compound and the glycidyl ether type epoxy compound are in a weight ratio of 1:1 to 3:1, preferably 1:1 to 2.5:1, more preferably 1:1 to 2:1. Can be included as.

In the present specification, the term "alicyclic epoxy compound" may mean a compound containing one or more epoxidized aliphatic cyclic groups, and the term "glycidyl ether type epoxy compound" is a compound containing at least one or more glycidyl ether groups Can mean

By including the alicyclic epoxy compound in the epoxy compound, the glass transition temperature of the active energy ray-curable composition forming the protective layer is increased so that the protective layer secures sufficient durability. Even if it is formed directly on one surface, it is possible to prevent the occurrence of cracks in the polarizer even under heat-resistant or thermal shock conditions.

In the alicyclic epoxy compound including an epoxidized aliphatic cyclic group, the epoxidized aliphatic cyclic group may mean, for example, a compound having an epoxy group formed on the alicyclic ring. In the above, the hydrogen atom constituting the alicyclic ring may be optionally substituted with a substituent such as an alkyl group. As the alicyclic epoxy compound, for example, a compound specifically exemplified below may be used, but the epoxy compound that may be used is not limited to the following types.

As the alicyclic epoxy compound, an epoxycyclohexylmethyl epoxycyclohexanecarboxylate-based compound represented by the following [Chemical Formula 1] may be exemplified.

[Formula 1]

In Formula 1, R1 and R2 each independently represent hydrogen or an alkyl group.

In the present specification, the term alkyl group refers to a straight-chain, branched or cyclic alkyl group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms, unless otherwise specified. The alkyl group may be optionally substituted with one or more substituents, or may be unsubstituted.

As another example of the alicyclic epoxy compound, an epoxycyclohexane carboxylate-based compound of an alkanediol represented by the following formula (2) may be mentioned.

[Formula 2]

In Formula 2, R ₃ and R ₄ each independently represent hydrogen or an alkyl group, and n represents an integer of 2 to 20.

In addition, as another example of the alicyclic epoxy compound, an epoxy cyclohexylmethyl ester-based compound of dicarboxylic acid represented by the following formula (3) may be mentioned.

[Formula 3]

In Formula 3, R ₅ and R ₆ each independently represent hydrogen or an alkyl group, and p represents an integer of 2 to 20.

As another example of the alicyclic epoxy compound, an epoxycyclohexylmethyl ether compound of polyethylene glycol represented by the following formula (4) may be mentioned.

[Formula 4]

In Formula 4, R ₇ and R ₈ each independently represent hydrogen or an alkyl group, and q represents an integer of 2 to 20.

As another example of the alicyclic epoxy compound, an epoxycyclohexylmethyl ether compound of an alkanediol represented by the following formula (5) may be mentioned.

[Formula 5]

In Formula 5, R ₉ and R ₁₀ each independently represent hydrogen or an alkyl group, and r represents an integer of 2 to 20.

As another example of the alicyclic epoxy compound, a diepoxy citris pyro compound represented by the following formula (6) may be mentioned.

[Formula 6]

In Formula 6, R ₁₁ and R ₁₂ each independently represent hydrogen or an alkyl group.

As another example of the alicyclic epoxy compound, a diepoxy monospiro-based compound represented by the following formula (7) may be mentioned.

[Formula 7]

In Formula 7, R ₁₃ and R ₁₄ each independently represent hydrogen or an alkyl group.

As another example of the alicyclic epoxy compound, a vinylcyclohexene diepoxide compound represented by the following formula (8) may be mentioned.

[Formula 8]

In Formula 8, R ₁₅ represents hydrogen or an alkyl group.

As another example of the alicyclic epoxy compound, an epoxycyclopentyl ether compound represented by the following formula (9) may be mentioned.

[Formula 9]

In Formula 9, R ₁₆ and R ₁₇ each independently represent hydrogen or an alkyl group.

As another example of the alicyclic epoxy compound, a diepoxy tricyclodecane compound represented by the following formula (10) may be mentioned.

[Formula 10]

In Formula 10, R ₁₈ represents hydrogen or an alkyl group.

As the alicyclic epoxy compound, more specifically, an epoxycyclohexylmethyl epoxycyclohexane carboxylate compound, an epoxycyclohexane carboxylate compound of an alkanediol, an epoxycyclohexylmethyl ester compound of a dicarboxylic acid, or an epoxycyclohexylmethyl ether compound of an alkanediol It is preferable to use, and esterified product of 7-oxabicyclo[4,1,0]heptane-3-carboxylic acid and (7-oxa-bicyclo[4,1,0]hepto-3-yl)methanol. (A compound in which R ₁ and R ₂ are hydrogen in Formula 1); Ester of 4-methyl-7-oxabicyclo[4,1,0]heptane-3-carboxylic acid with (4-methyl-7-oxa-bicyclo[4,1,0]hepto-3-yl)methanol Cargo (in Formula 1, R ₁ is 4-CH ₃ , R ₂ is a compound of 4-CH ₃ ); Esterified product of 7-oxabicyclo[4,1,0]heptane-3-carboxylic acid and 1,2-ethanediol (a compound in which R ₃ and R ₄ are hydrogen and n is 1 in Formula 2); (7-oxabicyclo[4,1,0]hepto-3-yl) an esterified product of methanol and adipic acid (a compound in which R ₅ and R ₆ are hydrogen and p is 2 in Chemical Formula 3); (4-methyl-7-oxabicyclo[4,1,0]hepto-3-yl)methanol and adipic acid esterified product (R ₅ and R ₆ in Formula 3 are 4-CH ₃ and p is 2 phosphorus compound); And an ether product of (7-oxabicyclo[4,1,0]hepto-3-yl)methanol and 1,2-ethanediol (in Formula 5, R ₉ and R ₁₀ are hydrogen and r is 1 ) One or more selected from the group consisting of may be preferably used, but is not limited thereto.

In addition, since the glycidyl ether type epoxy compound is included in the epoxy compound, the glycidyl ether reactive group forms a soft and polar chain in the protective layer after the curing reaction, thereby improving the adhesion of the protective layer to the polarizer. I can.

The glycidyl ether type epoxy compound may include, for example, an aliphatic polyhydric alcohol or a polyglycidyl ether of an alkylene oxide thereof such as ethylene oxide or propylene oxide adduct.

In one example, when a mixture of an alicyclic epoxy compound and a glycidyl ether type epoxy compound is used as the epoxy compound (A), the alicyclic epoxy compound is 3,4-epoxycyclohexylmethyl, 3,4 -Epoxycyclohexanecarboxylate, bis(3,4-epoxycyclohexylmethyl)adipatedicyclopentadienedioxide, limonenedioxide or 4-vinylcyclohexenedioxide may be exemplified, and the glycidyl As the ether type epoxy compound, an epoxy compound having an epoxy group other than an alicyclic epoxy group may be used. That is, specific glycidyl ether type epoxy compounds include novolac epoxy, bisphenol A epoxy, bisphenol F epoxy, brominated bisphenol epoxy, n-butyl glycidyl ether, aliphatic glycidyl ether (C12 to 14 ), 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, o-cresyl glycidyl ether, nonyl phenyl glycidyl ether, ethylene glycol diglycidyl ether, diethylene glycol diglyci Dyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl Ether, trimethylolpropane triglycidyl ether, trimethylolpropane diglycidyl ether, trimethylolpropane polyglycidyl ether, polyethylene glycol diglycidyl ether or glycerin triglycidyl ether, etc. may be exemplified, and 1 , A glycidyl ether having a cyclic aliphatic skeleton such as, 4-cyclohexanedimethanol diglycidyl ether, or a hydrogenated compound of an aromatic epoxy compound may be exemplified, and preferably glycidyl having a cyclic aliphatic skeleton Dyl ether, preferably a glycidyl ether having a cyclic aliphatic skeleton having 3 to 20 carbon atoms, preferably 3 to 16 carbon atoms, more preferably 3 to 12 carbon atoms may be used, but is not limited thereto.

In the exemplary embodiment of the present specification, the oxetane compound is a compound having a 4-membered cyclic ether in the molecule, but is not limited thereto, but 3-ethyl-3-hydroxymethyloxetane, 1,4-bis [(3 -Ethyl-3-oxetanyl)methoxymethyl]benzene, 3-ethyl-3-(phenoxymethyl)oxetane, di[(3-ethyl-3-oxetanyl)methyl] ether, 3-ethyl- Examples thereof include 3-(2-ethylhexyloxymethyl)oxetane and phenol novolac oxetane. These oxetane compounds can be easily obtained commercially, specifically Aaronoxetane OXT-101 (manufactured by Toa Kosei Co., Ltd.), Aaronoxetane OXT-121 (manufactured by Toa Kosei Co., Ltd.), and Alonok Cetane OXT-211 (manufactured by Toa Kosei Co., Ltd.), Aaronoxetane OXT-221 (manufactured by Toa Kosei Co., Ltd.), and Aaronoxetane OXT-212 (manufactured by Toa Kosei Co., Ltd.), and the like.

In the exemplary embodiment of the present specification, the oxetane compound (B) may be included in an amount of 5 to 40 parts by weight or 10 to 40 parts by weight based on 100 parts by weight of the epoxy compound (A).

In the exemplary embodiment of the present specification, the active energy ray-curable composition may further include a curable component, and the curable component includes a plurality of polymerizable double bonds such as a compound having a (meth)acryloyl group and a vinyl group. It may be a compound having dogs. For example, tripropylene glycol diacrylate, 1,9-nonanediol diacrylate, tricyclodecane dimethanol diacrylate, cyclic trimethylolpropane formal acrylate, dioxane glycol diacrylate, EO modified diacrylate Glycerin tetraacrylate, Aronix M-220 (manufactured by Toa Synthetic Corporation), light acrylate 1,9ND-A (manufactured by Kyoeisha Chemical Co., Ltd.), light acrylate DGE-4A (manufactured by Kyoeisha Chemical Co., Ltd.), light acrylate DCP -A (manufactured by Kyoeisha Chemicals), SR-531 (manufactured by Sartomer), and CD-536 (manufactured by Sartomer). Further, if necessary, various epoxy (meth)acrylates, urethane (meth)acrylates, polyester (meth)acrylates, various (meth)acrylate-based monomers, and the like may be mentioned.

In the exemplary embodiment of the present specification, the curable component may be included in an amount of 10 to 50 parts by weight or 20 to 40 parts by weight based on 100 parts by weight of the epoxy compound (A).

In the exemplary embodiment of the present specification, the active energy ray-curable composition may further include a photoinitiator.

Examples of the photoinitiator include alpha-hydroxyketone-based compounds (ex. IRGACURE 184, IRGACURE 500, IRGACURE 2959, DAROCUR 1173; Ciba Specialty Chemicals (manufactured)); Phenylglyoxylate-based compounds (ex. IRGACURE 754, DAROCUR MBF; Ciba Specialty Chemicals (manufactured)); Benzyl dimethyl ketal compounds (ex. IRGACURE 651; Ciba Specialty Chemicals (manufactured)); α-aminoketone compounds (ex. IRGACURE 369, IRGACURE 907, IRGACURE 1300; Ciba Specialty Chemicals (manufactured)); Monoacylphosphine compounds (MAPO) (ex. DAROCUR TPO; Ciba Specialty Chemicals (manufactured)); Bisacylphosphene compounds (BAPO) (ex. IRGACURE 819, IRGACURE 819DW; Ciba Specialty Chemicals (manufactured)); Phosphine oxide compounds (ex. IRGACURE 2100; Ciba Specialty Chemicals (manufactured)); Metallocene compounds (ex. IRGACURE 784; Ciba Specialty Chemicals (manufactured)); Iodonium salt (ex. IRGACURE 250; Ciba Specialty Chemicals (manufactured)); And a mixture of one or more of the above (ex.DAROCUR 4265, IRGACURE 2022, IRGACURE 1300, IRGACURE 2005, IRGACURE 2010, IRGACURE 2020; Ciba Specialty Chemicals (manufactured)) and the like. In the present invention, one or more of the above may be used, but the present invention is not limited thereto.

In the exemplary embodiment of the present specification, the photoinitiator may be included in an amount of 0.5 to 10 parts by weight, preferably 0.01 to 5 parts by weight, based on 100 parts by weight of the active energy ray-curable composition. When the photoinitiator is included in the above numerical range, ultraviolet rays reach the inside of the protective layer, the polymerization rate is excellent, and the molecular weight of the resulting polymer can be prevented from decreasing. For this reason, there is an advantage in that the formed protective layer has excellent cohesive strength and excellent adhesion to the polarizer.

In the exemplary embodiment of the present specification, the active energy ray-curable composition preferably has a glass transition temperature of 90°C or higher after curing, and may be, for example, 100°C to 150°C or 100°C to 130°C.

In the exemplary embodiment of the present specification, the active energy ray-curable composition preferably has a viscosity of 50 cps or more and 200 cps or less at room temperature, and may be, for example, 50 cPs to 130 cPs or less at room temperature. When the viscosity of the composition satisfies the above numerical range, the thickness of the protective layer can be formed to be thin, and there is an advantage of excellent workability. The room temperature may mean a temperature range of 23 ℃ to 28 ℃, specifically 23 ℃. It may be 24°C, 25°C, 26°C, 27°C or 28°C.

The viscosity is measured at room temperature (25° C.) using a No. 18 spindle using a Brookfield viscometer (manufactured by Brook Field). At this time, the amount of the composition is appropriately 6.5 mL to 10 mL, and the stabilized value is measured within 5 minutes to avoid prolonged exposure to light.

In the exemplary embodiment of the present specification, the active energy ray-curable composition is made of a dye, a pigment, an epoxy resin, an ultraviolet stabilizer, an antioxidant, a colorant, a reinforcing agent, a filler, an antifoaming agent, a surfactant, a photosensitizer, and a plasticizer as needed. It may further include one or more additives selected from the group.

Meanwhile, a method of forming the protective layer is not particularly limited, and may be formed by a method well known in the art. For example, a protective layer is formed by applying the active energy ray-curable composition to one surface of a polarizer by a coating method well known in the art, such as spin coating, bar coating, roll coating, gravure coating, and blade coating. Next, it may be performed by a method of curing through ultraviolet irradiation. For example, it can be performed by a method of irradiating ultraviolet rays, which is irradiation light, using an ultraviolet irradiation device.

In the exemplary embodiment of the present specification, the thickness of the protective layer is 4 μm or more and 11 μm or less, preferably 5 μm or more and 10 μm or less, and more preferably 6 μm or more and 8 μm or less. If the thickness of the protective layer is smaller than the above range, there is a concern that the strength and high temperature durability of the protective layer may be lowered, and if it exceeds the above range, it is not suitable in terms of thinning of the polarizing plate.

Protective film

The protective film is for supporting and protecting the polarizer, and protective films of various materials generally known in the art, for example, polyethylene terephthalate (PET) film, cycloolefin polymer (COP, cycloolefin) polymer) film, acrylic film, etc. may be used. Among these, in consideration of optical properties, durability, economy, etc., it is particularly preferable to use polyethylene terephthalate.

In one embodiment of the present specification, the storage modulus at 80° C. of the protective film may be 1500 Mpa or more, preferably 1800 Mpa or more, and more preferably 2000 Mpa or more. When the above numerical range is satisfied, the polarizer protective effect of the protective film may be increased. Specifically, it is possible to prevent the polarizer from being torn due to stress generated by contraction of the polarizer in a high temperature environment.

On the other hand, the attachment of the polarizer and the protective film is performed by coating the polarizing plate adhesive composition on the surface of the polarizer or the protective film using a roll coater, gravure coater, bar coater, knife coater or capillary coater, and then heating them with a laminate roll. It may be performed by a method of laminating or laminating by pressing at room temperature, or a method of UV irradiation after lamination. The adhesive composition for a polarizing plate will be described later.

Adhesive layer

In one embodiment of the present specification, the adhesive layer includes a photocurable adhesive composition or a cured product thereof.

In an exemplary embodiment of the present specification, the coefficient of thermal expansion at 80° C. of the adhesive layer is 130 ppm/K or less. When the above numerical range is satisfied, there is an advantage in that the occurrence of cracks in the polarizing plate is suppressed in a heat shock-resistant environment.

It is preferable that the adhesive layer is formed of a photocurable adhesive composition. As described above, when the adhesive layer is a curable resin layer formed of a photocurable adhesive composition, there is an advantage in that the manufacturing method is simple, and further, adhesion to the protective film is excellent. In addition, the durability of the polarizing plate can be further improved.

At this time, the photocurable adhesive composition is not particularly limited as long as the thermal expansion coefficient satisfies the above range, and may be, for example, a photocurable adhesive composition including an epoxy compound and an oxetane compound.

As the epoxy compound, at least one or more of an alicyclic epoxy compound glycidyl ether type epoxy compound may be used, and preferably a mixture of an alicyclic epoxy compound and glycidyl ether type epoxy compound may be used.

In the exemplary embodiment of the present specification, the alicyclic epoxy compound may be included in 10% to 50% by weight, preferably 20% to 40% by weight based on the total weight of the epoxy compound. If the above numerical range is satisfied, there is an advantage that the composition can be effectively cured during photocuring.

In the exemplary embodiment of the present specification, the glycidyl ether type epoxy compound may be included in 10% to 60% by weight, preferably 20% to 40% by weight based on the total weight of the epoxy compound.

The oxetane compound as described above may be used alone or in combination, and the content thereof is preferably 10 to 50 parts by weight, and more preferably 28 to 40 parts by weight based on 100 parts by weight of the epoxy compound. If it is included more than the above range, there is a problem of lowering the adhesive strength, and if it is included less than the above range, there is a problem of increasing the viscosity.

In the exemplary embodiment of the present specification, the photocurable adhesive composition is used as a dye, pigment, epoxy resin, ultraviolet stabilizer, antioxidant, toning agent, reinforcing agent, filler, antifoaming agent, surfactant, photosensitizer, photoinitiator, and plasticizer as needed. It may further include one or more additives selected from the group consisting of.

Polarizer

First, the polarizer of the present invention may be a polarizer well known in the art, for example, a film made of polyvinyl alcohol (PVA) containing iodine or a dichroic dye. The polarizer may be prepared by dyeing iodine or a dichroic dye to a polyvinyl alcohol film, but the method of manufacturing the polarizer is not particularly limited. In the present specification, the polarizer refers to a state in which the protective layer (or protective film) is not included, and the polarizing plate refers to a state including the polarizer and the protective layer (or protective film).

Meanwhile, the polarizer may have a thickness of 5 μm or more and 40 μm or less, and more preferably 5 μm or more and 25 μm or less. If the thickness of the polarizer is thinner than the above range, optical properties may deteriorate, and if the thickness of the polarizer is thicker than the above range, the amount of shrinkage of the polarizer at a low temperature (about -30°C) increases, which may cause a problem in the heat resistance of the overall polarizing plate.

Meanwhile, when the polarizer is a polyvinyl alcohol-based film, the polyvinyl alcohol-based film may be used without particular limitation as long as it includes a polyvinyl alcohol resin or a derivative thereof. In this case, examples of the polyvinyl alcohol resin derivative include, but are not limited to, polyvinyl formal resin, polyvinyl acetal resin, and the like. Alternatively, the polyvinyl alcohol-based film is a commercially available polyvinyl alcohol-based film generally used in the manufacture of a polarizer in the art, such as P30, PE30, PE60 of Kuraray, M2000, M3000, M6000 of Japanese Synthetic Company, etc. You can also use it.

Meanwhile, the polyvinyl alcohol-based film is not limited thereto, but the polymerization degree is preferably 1,000 or more and 10,000 or less, and preferably 1,500 or more and 5,000 or less. This is because when the degree of polymerization satisfies the above range, molecular movement is free and can be flexibly mixed with iodine or a dichroic dye.

The present specification provides a method of manufacturing the above-described polarizing plate-carrier film laminate.

The method of manufacturing the polarizing plate-carrier film laminate may be performed by a roll to roll process. Since it can be carried out in a continuous process using a roll-to-roll process, there is an economic advantage because the production yield is high and the production cost is reduced.

In the exemplary embodiment of the present specification, the preparing of the carrier film includes applying and drying a water-dispersible primer composition on one or both sides of the carrier film on the carrier film to provide a primer layer on one or both sides of the carrier film, respectively. It may further include a step.

In the method of manufacturing a polarizing plate-carrier film laminate according to an exemplary embodiment of the present specification, the method comprising: supplying a carrier film to one surface of a polarizer; And supplying a protective film to the other surface of the polarizer. Specifically, it may be performed by supplying a carrier film to one surface of the polarizer and supplying a protective film to the other surface of the polarizer.

The method of supplying the polarizer, the carrier film and the protective film may be performed using a method well known in the art. For example, the polarizer, the carrier film, and the protective film may be supplied in a form in which each film is wound on a roll, but is not limited thereto.

In addition, when the carrier film is used as described above, the carrier film effectively protects the polarizer when the protective layer is formed to prevent contamination of other components by the composition for forming the protective layer, and the pressure applied by the pressing means is reduced. The carrier film absorbs and relieves the stress applied to the polarizer, thereby effectively suppressing breakage.

In the exemplary embodiment of the present specification, the supply rate of each film is not particularly limited as long as it is a value suitable for the manufacturing process, but may be supplied at a rate of, for example, 1M/min or more and 100M/min, and preferably 10 It can be supplied at a rate of M/min or more and 50 M/min or less, and in this case, there is an advantage in that stable adhesion between the carrier film and the protective film to the polarizer can be achieved.

In the exemplary embodiment of the present specification, the polarizer may be stretched. That is, according to the manufacturing method of the polarizing plate of the present specification, the stretching process of the polarizer may be further performed before the supplying process of the polarizer. In the stretching step of the polarizer, the conditions and the like are not particularly limited.

In the exemplary embodiment of the present specification, the width of the carrier film may be greater than the width of the polarizer. When the width of the carrier film is larger than the width of the polarizer, contamination such as pressing means by the active energy ray-curable composition or the adhesive composition can be effectively reduced.

A method of manufacturing a polarizing plate according to an exemplary embodiment of the present specification includes forming a protective layer by supplying an active energy ray-curable composition between the polarizer and the carrier film.

The step of forming the protective layer may be performed by applying an active energy ray-curable composition to at least one of the bonding surface of the polarizer and the bonding surface of the carrier film in an arbitrary step in the film supply process. The surface on which the active energy ray-curable composition is applied is not limited, and for example, the active energy ray-curable composition may be applied to the bonding surface of the carrier film.

At this time, before the active energy ray-curable composition is applied to the bonding surface of the carrier film to which the active energy ray-curable composition is applied, a surface activation treatment such as corona treatment, plasma treatment, ultraviolet irradiation treatment, or electron beam irradiation treatment may be performed. have.

In the exemplary embodiment of the present specification, the method of applying the active energy ray-curable composition is not particularly limited as long as the required amount of the composition can be uniformly applied. For example, there are methods such as spin coating, bar coating, roll coating, gravure coating, and blade coating, and for a continuous process, preferably, roll coating may be used.

A method of manufacturing a polarizing plate according to an exemplary embodiment of the present specification includes forming an adhesive layer by supplying a photocurable adhesive composition between the polarizer and the protective film.

The step of forming the adhesive layer may be performed by applying a photocurable adhesive composition to at least one of the bonding surface of the polarizer and the bonding surface of the protective film in an arbitrary step in the film supply process. The surface on which the photocurable adhesive composition is applied is not limited, and for example, an active energy ray-curable composition may be applied to the bonding surface of the protective film.

In the exemplary embodiment of the present specification, the method of applying the photocurable adhesive composition is not particularly limited as long as the required amount of the composition can be uniformly applied. For example, there are methods such as spin coating, bar coating, roll coating, gravure coating, and blade coating, and for a continuous process, preferably, roll coating may be used.

A method of manufacturing a polarizing plate-carrier film laminate according to an exemplary embodiment of the present specification is by disposing a pair of pressing means on each surface of the carrier film and the protective film, and It includes the step of pressing the polarizing plate-carrier film laminate comprising a film. More specifically, it may be carried out by a method of pressing using a pair of pressing means sandwiched between the laminate. At this time, the pressing means is not particularly limited, but for example, a bonding machine such as a roll type laminator may be used.

In the exemplary embodiment of the present specification, the pressing may be performed at a pressure of 0.5Mpa to 10Mpa or 1Mpa to 8Mpa. When the above numerical range is satisfied, there is an advantage in that it is possible to effectively remove air bubbles introduced during film bonding while ensuring stable driving without damage to the polarizer.

A method of manufacturing a polarizing plate according to an exemplary embodiment of the present specification includes curing the protective layer and the adhesive layer by irradiating active energy rays.

In the exemplary embodiment of the present specification, the curing of the active energy ray-curable composition and the photocurable adhesive composition by irradiating the active energy ray may be performed by irradiating irradiation light using an active energy ray irradiation device. have.

The active energy ray irradiation device is not particularly limited, and examples thereof include a fusion lamp, an arc lamp, an LED, and a low-pressure lamp.

The manufacturing method of the polarizing plate according to an exemplary embodiment of the present specification is advantageous in that the protective layer and the adhesive layer can be simultaneously cured by irradiating the protective layer and the adhesive layer with active energy rays since the polarizer laminate having the protective layer and the adhesive layer formed thereon There is this.

The amount of light of the active energy ray may be 100mJ/cm ² to 1000mJ/cm ² , preferably 500mJ/cm ² to 1000mJ/cm ² , and the irradiation time of the irradiation light is 1 second to 10 minutes, preferably 2 seconds to It can be 30 seconds.

When the amount of light and the irradiation time range of the active energy ray are satisfied, the curing speed of the adhesive layer and the protective layer is fast, and excessive heat is prevented from being transmitted from the light source without deteriorating the external properties and optical properties of the film. It has the advantage of excellent productivity by minimizing the occurrence of running wrinkles.

In addition, the irradiation direction of the active energy ray is not particularly limited as long as the protective layer and the adhesive layer can be sufficiently cured, but may be preferably performed on the surface of the carrier film of the polarizing plate-carrier film laminate.

The present specification provides a method of manufacturing a polarizing plate, and the method of manufacturing the polarizing plate includes: preparing a polarizing plate-carrier film laminate manufactured by the above-described manufacturing method; And peeling the carrier film from the protective layer of the polarizing plate-carrier film laminate.

A method of manufacturing a polarizing plate according to an exemplary embodiment of the present specification includes a step of peeling the carrier film from the protective layer of the polarizing plate-carrier film stack (hereinafter, a peeling process).

In the exemplary embodiment of the present specification, the method of manufacturing the polarizing plate includes storing the polarizing plate-carrier film stack before the peeling process.

Hereinafter, the present specification will be described in more detail through examples. However, the following examples are for illustrating the present specification, and the scope of the present specification is not limited thereby.

<Experimental Example>

<Comparative Example 1: Carrier film not treated separately>

A polyethylene terephthalate film was prepared as a carrier film, and a separate drying treatment was not performed.

<Comparative Example 2: Carrier film dried for 1 minute>

The carrier film of Comparative Example 1 was dried for 1 minute at a relative humidity of 35% or less and a temperature of 80°C using a hot air oven (trade name: Mathis) equipment.

<Comparative Example 3:>

The carrier film of Comparative Example 1 was washed with water of 30° C. or higher and 40° C. or lower for 1 minute, and a water-saving process was performed to remove water with a sponge.

<Comparative Example 4>

The carrier film of Comparative Example 3 was dried for 10 seconds at a relative humidity of 35% or less and a temperature of 80°C using a hot air oven (trade name: Mathis) equipment.

<Comparative Example 5>

A carrier film was prepared in the same manner as in Comparative Example 4, except that the drying time was adjusted to 20 seconds.

<Comparative Example 6>

A carrier film was prepared in the same manner as in Comparative Example 4, except that the drying time was adjusted to 1 minute.

<Example 1: Carrier film dried for 3 minutes>

A carrier film was prepared in the same manner as in Comparative Example 2, except that the drying time was adjusted to 3 minutes.

<Example 2: Carrier film dried for 4 minutes>

A carrier film was prepared in the same manner as in Comparative Example 2, except that the drying time was adjusted to 4 minutes.

<Preparation of the composition for forming a protective layer>

Based on 100 parts by weight of 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexanecarboxylate (trade name Celoxide-2021), 3-ethyl-3-[(3-ethyloxetane-3- 1) A composition comprising 23 parts by weight of methoxymethyl]oxetane (Doa Gosei Aaron oxetane OXT-221) and 35 parts by weight of 1,4-cyclohexyl dimethanol diglycidyl ether (CHDMDGE) was prepared. Thereafter, for forming a protective layer by mixing 3 parts by weight of a modified siloxane compound (product name: OFX-0400 DOW CORNING), 3 parts by weight of Irgacure 250 as a photoinitiator and 1 part by weight of ESACURE ITX as a photosensitizer, based on 100 parts by weight of the composition. The composition was prepared.

<Preparation of adhesive composition>

3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexanecarboxylate (brand name Celoxide-2021) 30 parts by weight, 3-ethyl-3-[(3-ethyloxetan-3-yl) Methoxymethyl]oxetane (Doa Gosei Aaron oxetane OXT-221) 20 parts by weight, 1,4-cyclohexyl dimethanol diglycidyl ether (CHDMDGE) 40 parts by weight and nonanediol diacrylate 10 parts by weight containing An adhesive composition was prepared by adding 3 parts by weight of Irgacure 250 as a photoinitiator and 1 part by weight of ESACURE ITX as a photosensitizer to 100 parts by weight of the photocurable adhesive composition.

<Experimental Example: Blocking phenomenon test>

1) Preparation of a polarizing plate-carrier film laminate

A polyvinyl alcohol-based film (manufactured by Japan Synthetic Company) having a thickness of 23 µm stretched was supplied to the upper surface of the carrier film prepared in Comparative Examples 1 to 6 and Examples 1 and 2 under an atmosphere of 25°C, and to the lower surface thereof A polyethylene terephthalate film (PET, manufactured by Toyobo, Japan) was supplied as a protective film, and a pair of rolls was passed at a speed of 10 M/min and a pressure of 2 Mpa. At this time, the adhesive composition was applied between the polyvinyl alcohol-based film and the protective film to a thickness of about 3 μm using a roll-coating method to form an adhesive layer. In addition, the protective layer-forming composition was applied between the polyvinyl alcohol-based film and the carrier film to a thickness of about 5 μm using a roll-coating method to form a protective layer. The process of forming the adhesive layer and the protective layer may be performed simultaneously.

Thereafter, the protective layer and the adhesive layer were cured by irradiating ultraviolet rays on the carrier film side using a fusion lamp to prepare each polarizing plate-carrier film laminate.

2) Peel force test

Make the polarizer-carrier film laminated body with a sample length of 50 mm in the direction perpendicular to the winding direction. It was wound on a roll to form a film roll. Thereafter, after leaving for 2 days, 5 days and 8 days respectively, the carrier film was peeled at a speed of 30 m/min at an angle of 180°, and a film high-speed peeling machine (equipment name: CBT-4720, Chungbuk Tech) was used. Then, the peel force was measured according to the ASTM 3330 measurement method. At this time, depending on the appearance of the film, Lv. From 0 Lv. It was evaluated separately up to 3.

*Lv. 0: Both the protective layer of the polarizer and the carrier film are in a clean state without abnormalities

Lv. 1: There is no abnormality in the appearance of the protective layer of the polarizer, but the peeled carrier film surface is deformed

Lv. 2: A state in which the surface of the protective layer of the polarizer is deformed

Lv. 3: Carrier film is torn without peeling off

The measurement results are shown in Table 1 below.

Carrier film type Measurement result 2 days later 5 days later 8 days later Appearance evaluation Peel force (g/5cm) Appearance evaluation Peel force (g/5cm) Appearance evaluation Peel force (g/5cm) Comparative Example 1 2 58 2 94 2 132 Comparative Example 2 0 22 2 62 2 119 Comparative Example 3 3 116 3 152 2 143 Comparative Example 4 One 34 One 45 2 66 Comparative Example 5 2 63 2 98 2 107 Comparative Example 6 2 83 2 68 2 111 Example 1 0 9 One 45 One 39 Example 2 0 5 0 23 0 28

From the above results, when the carrier film is not dried (Comparative Example 1) or the drying time is less than 3 minutes (Comparative Example 2), the moisture on the surface of the carrier film cannot be sufficiently removed, and the moisture remaining on the surface of the carrier film It was confirmed that a blocking phenomenon in which the carrier film and the protective layer adhere to each other appeared.

In particular, it was confirmed that the blocking phenomenon was further intensified by the water introduced in the washing step when the washing and water-removing processes were performed (Comparative Examples 3 to 6).

On the other hand, in the case of Examples 1 and 2 in which the carrier film was dried at 80° C. for 3 minutes or 4 minutes, since moisture on the surface of the carrier film did not remain, the above-described blocking phenomenon was suppressed.

<Experimental Example: Haze Test>

The haze value of the pretreated carrier film was tested. The results are shown in Table 2 below. As for the experimental method, the internal haze of the carrier film was measured through a hazemeter (manufacturer: Sekos). The internal haze refers to the degree of haze or turbidity, and was measured by haze in the transmission mode.

Carrier film type Haze value measurement result Haze change rate (%, general formula 1) Before pretreatment Immediately after pretreatment Comparative Example 2 4.89 4.92 0.61% Comparative Example 4 5.03 4.98 0.99% Comparative Example 5 5.03 4.87 3.18% Comparative Example 6 5.03 4.90 2.58% Example 1 4.89 4.86 0.61% Example 2 4.89 4.84 1.02%

From the results of Table 2 above, it was confirmed that the carrier film pretreatment method of the present invention did not significantly increase the haze value inside the carrier film because the drying temperature was low and the carrier film was not crystallized.

10, 20: pressure roll
30, 40: running roll
50: adhesive composition application means
60: active energy ray irradiation means
70: means for applying the composition for forming a protective layer
100: polarizer
110: polarizer roll
200: carrier film
210: carrier film roll
300: protective film
310: protective film roll
500: polarizing plate winding roll

Claims (9)

A pretreatment method for a carrier film for a polarizing plate comprising drying the carrier film for 3 to 4 minutes under conditions of a relative humidity of 30% or less and a temperature of 70° C. or more and 100° C. or less,
The pretreatment method of the carrier film for a polarizing plate satisfies the following general formula 1-2,
[General Formula 1-2]

In the general formula 1-2, Ha is the internal haze value of the carrier film before pretreatment, Hb is the internal haze value of the carrier film after pretreatment,
The carrier film is a polyethylene terephthalate (PET) film is a pre-treatment method of a carrier film for a polarizing plate. delete The method of claim 1, wherein the Hb is 4.5% or more and 5.5% or less. The method of claim 1, wherein P in the following general formula 2 is 20% or less:
[General Formula 2]

In the general formula 2, W1 is the moisture content (W1) on the surface of the carrier film before pretreatment measured at 25°C, and W2 is the moisture content (W2) on the surface of the carrier film after pretreatment measured at 25°C. delete The method of claim 1, comprising washing the carrier film and repairing the carrier film before drying the carrier film. The method of claim 6, wherein the washing of the carrier film is performed with water of 30° C. or more and 50° C. or less. Preparing a carrier film treated by the pretreatment method according to any one of claims 1, 3, 4, 6 and 7;
Supplying the carrier film to one surface of a polarizer;
Supplying a protective film to the other surface of the polarizer;
Forming a protective layer by supplying an active energy ray-curable composition between the polarizer and the carrier film;
Forming an adhesive layer by supplying a photocurable adhesive composition between the polarizer and the protective film;
Placing a pair of pressing means on each surface of the carrier film and the protective film to press the polarizing plate-carrier film laminate including the carrier film, the protective layer, the polarizer, the adhesive layer, and the protective film; And
A method of manufacturing a polarizing plate-carrier film laminate comprising the step of curing the protective layer and the adhesive layer by irradiating active energy rays. Preparing a polarizing plate-carrier film laminate manufactured by the manufacturing method according to claim 8; And
A method of manufacturing a polarizing plate comprising the step of peeling a carrier film from the polarizing plate-carrier film laminate.

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