KR101851282B1 - Laminate, a polarizing plate including thereof and preparing method for the same - Google Patents

Abstract

The present invention relates to a laminate, a polarizing plate, and a manufacturing method thereof. The laminate comprises: a +C plate layer; an adhesive layer formed on the +C plate layer; and a +A plate layer formed on the adhesive layer, in which a polarizing plate including the laminate is applied to be excellent in preventing reflection in the oblique direction of the illumination surface to improve the reflection colors.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated body, a polarizing plate including the laminated body,

The present invention relates to a laminate, a polarizing plate including the same, and a method of manufacturing the same.

The organic electroluminescence (organic EL) display device is a self-luminous type thin display device, and has advantages such as high visibility and less dependency on viewing angle compared to a liquid crystal display device. In addition, it is possible to realize a display device of a shape that can not be realized until now, by using a flexible substrate by adding advantages such as lightness and thinness of the display.

However, since the organic EL display device uses a transparent conductive material having a high refractive index such as ITO for the electrodes to laminate layers having different refractive indexes or uses a metal material having a high reflectance, the external light is reflected at the interface thereof, One non-visible problem due to internal reflection may occur.

In order to solve such a problem, Korean Patent Laid-Open Publication No. 2014-0135739 has a polarizer layer, a? / 2 retardation layer , a ? / 4 retardation layer and an organic EL panel in order, / 4 retardation layer is adjusted to provide an organic EL display device having excellent viewing angle characteristics with high productivity. A conventional method for producing a polarizing plate using such components (FIG. 3) is to adhere polarizer, lambda / 2 retardation layer, lambda / 4 retardation layer and organic EL panel to each layer in order by using an adhesive . The above method is stacked one by one using a take-up reel. At this time, there is a problem that a loss of about 5 to 10% of raw material of each layer occurs due to a mechanical process every time each layer is stacked. Further, when the polarizing plate is used in an image display apparatus, there arises a problem that the antireflection effect in the oblique direction of the screen is deteriorated.

Korean Patent Publication No. 2014-0135739 (Apr. 26, 2014)

An object of the present invention is to provide a laminate for producing a polarizing plate excellent in antireflection effect in the oblique direction of the screen.

It is another object of the present invention to provide a method of manufacturing a polarizing plate capable of minimizing loss of raw materials and shortening a manufacturing process time during the manufacturing process of the laminate and the polarizer.

According to an aspect of the present invention, there is provided a laminate comprising: a + C plate layer; A pressure-sensitive adhesive layer formed on the + C plate layer; And a + A plate layer formed on the pressure-sensitive adhesive layer.

A polarizing plate according to an embodiment of the present invention includes a second release film; A second pressure-sensitive adhesive layer formed on the second release film; The laminate formed on the second pressure-sensitive adhesive layer; A first pressure-sensitive adhesive layer formed on the laminate; And a polarizer formed on the first pressure-sensitive adhesive layer.

Also, a method of manufacturing a polarizing plate according to an embodiment of the present invention may include: a) a + C plate layer; A pressure-sensitive adhesive layer formed on the + C plate layer; And a + A plate layer formed on the pressure-sensitive adhesive layer, the laminate having a substrate on the lower surface of the + C plate layer and the upper surface of the + A plate layer; b) attaching a polarizer having a first pressure-sensitive adhesive layer formed thereon to the surface of the + A plate layer, and bonding the first pressure-sensitive adhesive layer so that the first pressure-sensitive adhesive layer is positioned between the + A plate layer and the polarizer ; And c) peeling the substrate formed on the lower surface of the + C plate layer, and bonding a second release film having a second pressure-sensitive adhesive layer on the surface, wherein the second pressure-sensitive adhesive layer comprises a + C plate layer and a second release film To be positioned between the first and second substrates.

The polarizing plate including the laminate according to the present invention has an effect of preventing reflection in the oblique direction of the screen and improving the reflection color feeling.

In addition, the method for producing a polarizing plate according to the present invention has the effect of minimizing the loss of raw materials generated in the production process of the polarizing plate by preliminarily manufacturing the laminated body, and shortening the manufacturing process time.

Fig. 1 is a diagram showing the relationship of the directions (x, y, z) of the refractive indexes (nx, ny, nz).
2 is a schematic view illustrating a method of manufacturing a laminate according to an embodiment of the present invention.
FIG. 3 is a schematic view illustrating a method of manufacturing a polarizing plate according to an embodiment of the present invention.
4 is a schematic view of a conventional polarizing plate manufacturing method.

Whenever a part is referred to as "including " an element in the present invention, it is to be understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Hereinafter, preferred embodiments of the present invention will be described in detail.

A laminate 600 according to an aspect of the present invention includes a + C plate layer 202; An adhesive layer 300 formed on the + C plate layer 202; And a + A plate layer 201 formed on the pressure-sensitive adhesive layer 300. When the polarizer including the + C plate layer 202 and the + A plate layer 201 is applied to an image display apparatus, the laminate 600 has antireflection characteristics not only in the front direction of the screen but also in the oblique direction (See Fig. 2)

The + C plate layer 202 and the + A plate layer 201 will be described in detail.

First, in the present invention, the refractive index ratio (Nz) is defined by the following equation (1): "

[Equation 1]

In the above equation (1), nx and ny denote the refractive indexes of the film, which are plane refractive indices, where x is the vibration direction at which the plane refractive index becomes the maximum, and nx and ny denote perpendicular Nx ≥ ny, and nz represents the refractive index in the direction perpendicular to the plane defined by nx and ny (film thickness direction). The directional relationships of nx, ny and nz are schematically shown in Fig.

In the above equation (1), R _th is a thickness retardation value indicating a difference in refractive index in the thickness direction with respect to an in-plane averaged refractive index, and R _o is a thickness direction retardation value And is defined as the following formula (3) as a front retardation value which is a substantial retardation.

&Quot; (2) "

In the above equation (2), nx and ny denote the refractive indexes of the film, which are plane refractive indices, and the refractive indices of the planar refractive indices are the maximum, x is nx and ny are perpendicular to each other Nx ≥ ny, nz represents the refractive index in the direction perpendicular to the plane defined by nx and ny (film thickness direction), and d represents the thickness of the film.

&Quot; (3) "

In the above equation (3), nx and ny denote the refractive indexes of the film, which are plane refractive indices, where x is the vibration direction in which the plane refractive index becomes the maximum, and nx and ny are perpendicular to each other Nx ≥ ny, nz represents the refractive index in the direction perpendicular to the plane defined by nx and ny (film thickness direction), and d represents the thickness of the film.

Typically, the plate type of the phase difference is 1) when the light advances in a specific direction, the refractive indices of all the vibration directions on the propagation direction are all the same, and the phase difference of light traveling in the propagation direction is not in the propagation direction An A plate in the case where the optical axis in the in-plane direction exists; 2) the C plate when the optical axis exists in the direction perpendicular to the plane; And 3) when there are two optical axes, it is called a B plate. More specifically, it is as follows.

(1) Nz = -∞: + C plate (POSITIVE C PLATE), nz> nx = ny

(2) Nz <0: + B plate (POSITIVE B PLATE), nz> nx> ny

(3) Nz = 0: -A plate (NEGATIVE A PLATE), nx = nz > ny

(4) 0 < Nz < 1: Z-axis oriented film, nx> nz> ny

(5) Nz = 1: + A plate (POSITIVE A PLATE), nx> ny = nz

(6) 1 <Nz: -B plate (NEGATIVE B PLATE), nx> ny> nz

(7) Nz = ∞: -C plate (NEGATIVE C PLATE), nx = ny> nz

However, the above definition is theoretical and it is practically very difficult to make A plates, B plates and C plates that perfectly match the above definition. Accordingly, the refractive index ratio, the frontal retardation, and the like are usually set within a predetermined range within a range that does not largely deviate from the above definition, if necessary.

In this respect, in the present invention, a + C plate is also determined when the refractive index ratio (Nz) is -6 or less.

The + C plate layer 202 included in the laminate according to an embodiment of the present invention is used together with a + A plate layer 201 to be described later. There is an advantage of improving the image quality by improving the reflection color feeling by improving the deterioration of the reflectance characteristic in the vertical direction (the direction viewed from above, below, left, and right in the front view direction of the screen).

The + C plate layer 202 may be prepared by orienting a polymer film by a suitable method, or may be prepared by coating a polymeric cholesteric liquid crystal compound on one surface of a substrate, orienting the polymer film in a predetermined direction, and then curing the polymerizable When a cholesteric liquid crystal compound is used, a zero retardation film can be used as a substrate. In the present invention, a zero-retardation film refers to a film in which no substantial retardation occurs even though light is transmitted.

The + C plate layer 202 ideally means that the refractive index ratio Nz is negative infinity, but it may include a case where it is substantially -6 or less as described above. The refractive index of the entire polarizing plate may be 0.1 to 0.8. Accordingly, the thickness direction retardation value R _th and the front retardation value R _{o of} the + C plate layer 202 may have various ranges. Specifically, the thickness direction retardation value (R _th ) may be -190 to -10 nm. When the refractive index ratio of the + C plate layer 202 exceeds -6 or the retardation value in the thickness direction is out of the above range, the effect of improving the reflection color feeling may be insignificant. Further, the front retardation value (R _o ) should ideally be 0 nm, but is included in the present invention to the extent that it can be seen as substantially 0 nm. Specifically, the range of the front retardation value (R _o ) may be -1 to 1 nm, but is not limited thereto. If the range of the total refractive index of the polarizing plate is satisfied as described above, an effect of maximizing the antireflection effect and the reflection color feeling can be expected.

The + A plate layer 201 serves to prevent reflected light when applied to a polarizing plate.

As an example of the + A plate layer 201, there can be mentioned a? / 4 phase difference layer, which can be obtained by orienting the polymer film in the uniaxial direction, the biaxial direction, or other suitable method.

The type of the polymer compound constituting the polymer film is not particularly limited, but it is preferable to use a polymer compound having high transparency so as to be suitable for use in an image display apparatus. Specifically, a polycarbonate compound, a polyester compound, Based compound, polyether sulfone-based compound, polystyrene-based compound, polyolefin-based compound, polyvinyl alcohol-based compound, cellulose acetate-based compound, polymethylmethacrylate-based compound, chlorinated polyvinyl-based compound, polyacrylate- , Polyamide polyvinyl chloride compounds, and the like.

The? / 4 retardation layer may be made of a nematic or smectic liquid crystal material polymerizable by in situ polymerization, preferably a nematic liquid crystal material. As specific examples, a polymerizable liquid crystal material may be coated on a substrate and aligned in a plane orientation, followed by polymerization by exposure to heat or ultraviolet light.

The? / 4 retardation layer may have various wavelength dispersion characteristics as required. Specifically, it may have reverse wavelength dispersion property, flat wavelength dispersion property, and regular wavelength dispersion property.

For example, when the? / 4 phase difference layer has an inverse wavelength dispersion property, the value of R _o (450 nm) / R _o (550 nm) may be 0.7 or more and less than 0.99.

For example, when the? / 4 retardation layer has flat wavelength dispersibility, the R _o (450 nm) / R _o (550 nm) value may be 0.99 or more and less than 1.01.

For example, the value of R _o (450 nm) / R _o (550 nm) may be 1.01 or more and 2 or less when the λ / 4 retardation layer has a regular wavelength dispersion property.

According to the wavelength dispersion characteristics of the? / 4 retardation layer, the range of the total refractive index ratio that can maximize the antiglare effect and reflection color of the polarizing plate including the retardation layer can be varied. The refractive index ratio of the polarizing plate is specifically 0.1 to 0.8 . Specifically, the thickness direction retardation value (R _th ) of the? / 4 retardation layer may be 40 to 180 nm, and the front retardation value (R _o ) may be 110 to 180 nm.

According to an embodiment of the present invention, the + A plate layer 201 may be a lambda / 4 retardation layer having an inverse wavelength dispersibility, and when a lambda / 4 retardation layer having the inverse wavelength dispersion property is used, It has an advantage of being excellent in the role of the circularly polarizing plate and realizing a reflection color close to black.

The pressure-sensitive adhesive layer 300 is used for adhesion between the respective constituent layers of the laminate and a polarizing plate described below. At this time, the constituent components of the pressure-sensitive adhesive layer 300 are not limited to the pressure-sensitive adhesive, and an adhesive can also be used.

The pressure-sensitive adhesive is, for example, obtained by radical polymerization of an acrylic monomer mixture containing a (meth) acrylic acid ester as a main component and a (meth) acrylic monomer having a functional group in the presence of a polymerization initiator, and has a glass transition temperature An acrylic pressure-sensitive adhesive containing an acrylic resin having a temperature of 0 占 폚 or lower and a crosslinking agent can be used.

Examples of the adhesive include an aqueous adhesive in which an adhesive component is dissolved or dispersed in water, and a composition that cures upon irradiation with active energy rays (hereinafter sometimes referred to as an active energy ray curable adhesive).

The water-based adhesive may include a polyvinyl alcohol-based resin or a urethane resin as a main component, and may include a crosslinking agent such as an isocyanate-based compound or an epoxy compound or a composition containing a curing compound to improve the adhesiveness.

According to one embodiment of the present invention, the pressure-sensitive adhesive layer 300 may be an ultraviolet curable adhesive layer. When the laminate includes an ultraviolet curing type adhesive layer, it is possible to shorten the processing time of the water-based adhesive requiring a drying process in which moisture can be rapidly evaporated by using ultraviolet rays only after curing after application of the adhesive .

The thickness of the pressure-sensitive adhesive layer after drying is usually 0.001 to 5 占 퐉, specifically 0.01 to 2 占 퐉, more specifically 0.01 to 1 占 퐉. If the thickness of the pressure-sensitive adhesive layer is less than the above range, the pressure-sensitive adhesive layer may have insufficient adhesive force. If the thickness of the pressure-sensitive adhesive layer is more than the above range, the thickness of the laminate or polarizing plate may be increased.

Specific details of the external pressure-sensitive adhesive and the adhesive are described in detail in Korean Patent Laid-Open Publication No. 2015-0029562, and the pressure-sensitive adhesive of the present invention may be referred to the pressure-sensitive adhesive described in the above patent.

According to an embodiment of the present invention, the substrate 100 may be formed on the lower surface of the + C plate layer 202 and the upper surface of the + A plate layer 201, respectively, have.

The substrate 100 is for protecting the + C plate layer or the + A plate layer, respectively, and can be peeled off when the polarizing plate is manufactured using the laminate including the same.

The substrate 100 may be a transparent substrate, but is not particularly limited.

The transparent substrate may be, for example, a transparent substrate that can transmit light, particularly visible light, and may have a light transmittance of 80% or more at a wavelength of 380 to 780 nm.

The composition of the base material 100 is described in detail in Korean Patent Laid-Open Publication No. 2015-0029562, and the structure of the base material 100 of the present invention may be referred to the composition of the description disclosed in the above-mentioned patent.

The laminate 600 may be manufactured, for example, by the following method. The terms "first" and "second" used in the present invention are used for convenience of description, and they are not necessarily used in the sense of using constituent materials of different components, have.

A + C plate layer 202 is formed on one surface of the second base material 102 as shown in (a2), and a + C plate layer 202 is formed on one surface of the second base material 102 as shown in (a1) (A3), a bonded body obtained by sticking the pressure-sensitive adhesive layer 300 on one surface of the release film 500 is prepared. A + plate layer 201 of the bonded body prepared in (a1) and the pressure-sensitive adhesive layer 300 of the bonded body prepared in (a3) are bonded together to form a bonded body. C plate layer 202 of the bonded body prepared in (a2) is bonded to the pressure-sensitive adhesive layer 300 exposed by peeling off the release film 500 of the bonded body formed in (A1) 600) (see Fig. 2).

Another aspect of the present invention is a lithographic apparatus comprising: a second release film (502); A second pressure-sensitive adhesive layer (302) formed on the second release film (502); The laminate 600 formed on the second pressure-sensitive adhesive layer 302; A first pressure sensitive adhesive layer (301) formed on the laminate (600); And a polarizer 400 formed on the first pressure-sensitive adhesive layer 301 (see FIG. 3).

The release film 500 is not particularly limited as long as it is a film commonly used in the art, and specific examples thereof include polyethylene, polypropylene, poly-1-butene, poly- A polyolefin-based film such as a propylene copolymer, an ethylene-1-butene copolymer, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer and an ethylene-vinyl alcohol copolymer; Polyester films such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; Polyacrylate-based films; A polystyrene type film; Polyamide-based films such as nylon 6 and partially aromatic polyamide; Polyvinyl chloride films; Polyvinylidene chloride films; Or a polycarbonate film may be used. These may be suitably subjected to a mold releasing treatment using a mold releasing agent such as a silicone type, a fluorine type, a silica powder and the like.

The polarizer 400 is a device for changing natural light into linearly polarized light. Usually, the polarizer 400 is a process of uniaxially stretching a polyvinyl alcohol-based film, a process of staining a polyvinyl alcohol-based film with a dichroic dye, , A step of treating a polyvinyl alcohol resin film on which a dichroism dye is adsorbed with an aqueous solution of boric acid and a step of washing with water after treatment with an aqueous solution of boric acid or by coating a dye having absorption anisotropy , A transparent protective film may be bonded to at least one surface of the substrate with an adhesive layer interposed therebetween.

As the polarizer 400 manufactured by applying the dye having absorption anisotropy, a polarizer 400 obtained by applying a composition containing a dichroic dye having liquid crystallinity or a composition comprising a dichroic dye and a polymerizable liquid crystal compound .

The polarizer 400 coated with the dye having absorption anisotropy may be 20 m or less, specifically 5 m or less, more specifically 0.5 to 3 m. When the thickness of the polarizer 400 coated with the coloring matter having an absorption anisotropy is less than the above range, the problem of poor workability may occur.

As the polarizer 400 coated with the coloring matter having the absorption anisotropy, specifically, there can be enumerated the film described in Japanese Patent Laid-Open Publication No. 2012-33249.

Specific details of the external polarizer 400 are described in Korean Patent Laid-Open Publication No. 2015-0029562, and the polarizer 400 of the present invention may be referred to the polarizer described in the above-mentioned patent.

When the polarizing plate includes all of the above-described configurations, there is an effect that, when applied to an image display apparatus, the polarizing plate is excellent in antireflection characteristics not only in the front direction of the screen but also in the oblique direction.

A method of manufacturing a polarizing plate according to another embodiment of the present invention comprises the steps of: a) a + C plate layer 202; An adhesive layer 300 formed on the + C plate layer 202; And a + A plate layer 201 formed on the pressure-sensitive adhesive layer 300. The upper surface of the + A plate layer 202 and the lower surface of the + ; b) peeling the first base material 101 formed on the upper surface of the + A plate layer 201 and bonding the polarizer 400 having the first pressure-sensitive adhesive layer 301 to the surface, (301) is positioned between the + A plate layer (201) and the polarizer (400); And c) peeling off the second base material 102 formed on the lower surface of the + C plate layer 202 and bonding the second release film 502 having the second pressure sensitive adhesive layer 302 on the surface thereof, Bonding the second pressure sensitive adhesive layer 302 so that the second pressure sensitive adhesive layer 302 is positioned between the + C plate layer 202 and the second release film 502 (see FIG. 3).

3, a first adhesive layer 301 is placed on one side of the first release film 501, and a second adhesive layer (not shown) and a second adhesive layer 302 is placed on one side of the second release film 502 as shown in FIG. A bonded body is formed by bonding the first pressure-sensitive adhesive layer 301 of the bonded body prepared in (b1) on one surface of the polarizer 400 as shown in (B1) of FIG. (B), the first base material 101 of the layered product, which has been preliminarily formed on the first pressure-sensitive adhesive layer 301 exposed by peeling off the first release film 501 of the bonded body of the above-mentioned (B1) The plate layer 201 is bonded to form a bonded body. The + C plate layer 202 exposed by peeling off the second base material 102 of the bonded body formed in (B2) above and the second pressure sensitive adhesive layer 302 of the bonded body prepared in (b2) .

At this time, the peeling force between the first base material 101 and the + A plate layer 201 in the laminated body 600 may be lower than the peeling force between the second base material 102 and the + C plate layer 202 . A + plate layer (201) and the first pressure-sensitive adhesive layer (301) of the laminate (600) are bonded to each other in order to adhere the first pressure-sensitive adhesive layer (301) The peeling force of the first base material 101 and the + A plate layer 201 is peeled off from the second base material 102 and the + C plate layer 202 when the first base material 101 placed on the first base material 101 is peeled off, The effect of peeling can be expected more easily. Specifically, the peeling force between the first base material 101 and the + A plate layer 201 included in the laminate 600 may be 0.02 to 0.08 N / 25 mm, and the peeling force between the second base material 102 and the + The peel force between the plate layers 202 may be 0.06 to 0.13 N / 25 mm. The difference between the peeling force between the first base material 102 and the + A plate layer 201 and the peeling force between the second base material 102 and the + C plate layer 202 may be 0.02 N / 25 mm or more, When the difference in the peeling force is less than the above range, the difference in the peeling force is insignificant, so that the peeling can not be performed properly first.

As described above, when the laminated body 600 according to an embodiment of the present invention is manufactured in advance to manufacture a polarizing plate, the production time of the polarizing plate is reduced by previously separately preparing the laminated body 600, It is possible to reduce the cost of the manufacturing process by reducing the loss of the raw material generated when the polarizer 400 having a relatively high unit price is input to the take-up reel.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims. In the following Examples and Comparative Examples, "%" and "part" representing the contents are by weight unless otherwise specified.

Manufacturing example

Manufacturing example  One: Polarizer  Produce

A polyvinyl alcohol film (VF-PS, manufactured by KURARAY Co.) having an average degree of polymerization of 2,400 and a degree of saponification of 99.9 mol% or more was stretched uniaxially 6 times in a wet manner and water of 60 DEG C (deionized water ) For 1 minute, and then immersed in an aqueous solution of 55 ° C at a weight ratio of iodine: potassium iodide: water of 0.013: 5: 100 for 300 seconds. Thereafter, the film was washed with water at 10 DEG C for 5 seconds and then dried at 45 DEG C for 4 minutes to prepare a polarizer in which iodine adsorbed and oriented on a polyvinyl alcohol resin.

Manufacturing example  2: Of the laminate  Produce

Retardation layer 201 (DNP, manufactured by DNP Co., Ltd.) as a + A plate layer on one surface of a first base material 101 (PET film, manufactured by Toray Industries, Inc.) (Manufactured by DNP) on a surface of a second base material 102 (PET film, manufactured by Toray Industries, Inc.) having a thickness of 100 mu m and a thickness of 1 mu m, Prepared.

Curing adhesive for forming the pressure-sensitive adhesive layer 300 on the? / 4 retardation layer 201 positioned on the prepared first base 101 and applying a UV curable adhesive to the + C plate The layer 202 was adhered and irradiated with ultraviolet rays (UV) to prepare a laminate 600. The process is shown in FIG.

As the ultraviolet curable adhesive, an epoxy resin composition (KR series, product of ADEKA, viscosity: 44 m Pa? Es) containing a cationic polymerization initiator was used.

Example

A first pressure-sensitive adhesive (acrylic pressure-sensitive adhesive, manufactured by LINTEC CO., LTD.) Was coated on one side of a 38 占 퐉 -thick first release film 501 (manufactured by Lintec Co., Ltd.) (Acrylic pressure-sensitive adhesive, manufactured by LINTEC CO., LTD.) Was coated on one side of a 38 μm thick second release film 502 (manufactured by LINTEC CO., LTD.) And a pressure-sensitive adhesive layer 302 were formed.

A first adhesive layer 301 placed on the first release film 501 is bonded to one surface of the polarizer 400 manufactured in the first manufacturing example to form a bonded body, The first adhesive layer 301 exposed after peeling off the first release film 501 located on one side was peeled off the first base material 101 of the layered product 600 prepared in Production Example 2 to reveal a? / 4 And bonded to the retardation layer 201 to form a bonded body. A second polarizer plate 302 was bonded to the + C plate layer 202 exposed by peeling off the second base material 102 of the bonded body by bonding the second pressure-sensitive adhesive layer 302 located on the second release film 502. This process is shown in FIG.

Comparative Example

On the surface of a first base material 101 (triacetylcellulose film, manufactured by Fuji Film Co., Ltd.) having a thickness of 80 μm, a λ / 4 retardation layer 201 having a thickness of 2 μm (manufactured by Fuji Film Co., Ltd.) A retardation layer 203 (manufactured by Fuji Photo Film Co., Ltd.) having a thickness of 1 mu m was laminated on one surface of a second base material 102 (triacetylcellulose film, manufactured by Fuji Film Co., Ltd.) (Acrylic pressure-sensitive adhesive, manufactured by LINTEC CO., LTD.) Was coated on one side of a 38 占 퐉 -thick first release film 501 (manufactured by Lintec Co., Ltd.) (Acrylic pressure-sensitive adhesive, manufactured by Lintec Co., Ltd.) was coated on one side of a bonded release member having the first release film 301 formed thereon and a second release film 502 (Lintec Co., Ltd.) (Acrylic pressure-sensitive adhesive, manufactured by Lintec Co., Ltd.) was applied on one side of a 38 占 퐉 -thick adhesive layer and a 38 占 퐉 -thick third release film 503 (manufactured by Lintec Co., Ltd.) After coating, And a third pressure-sensitive adhesive layer (303) were formed thereon.

The first pressure sensitive adhesive layer 301 was bonded on one side of the polarizer 400 manufactured in Production Example 1 to form a bonded body and the first pressure sensitive adhesive 501 was peeled off, / 2 retardation layer 203 is bonded to the layer 301 as shown in Fig. After the second base material 102 is peeled off, the second pressure-sensitive adhesive layer 302 is bonded on one side of the? / 2 phase difference layer 203 to form a bonded body. The? / 4 retardation layer 201 is bonded onto one surface of the second pressure sensitive adhesive layer 302 exposed after the second release film 502 is peeled off and the? / 4 retardation layer 201, and the third pressure-sensitive adhesive layer 303 was bonded to one side of the retardation layer 201 to manufacture a polarizing plate.

Experimental Example

Experimental Example  1: Comparison of manufacturing process time

The time taken to produce the polarizing plate in the above Examples and Comparative Examples was measured and compared. In this experiment, a polarizer having a total length of 2500 m was divided into three zones (1000 m, 1000 m, 500 m) to fabricate a polarizing plate (Experimental Example 1-1) (Experimental Examples 1 and 2).

At this time, an operation (hereinafter referred to as a RW process) of making a roll having a new laminated structure by joining a roll on which at least one film is wound and another roll in which at least one film is wound is bonded to each other. In this case, the measurement time is calculated by summing up the time required for the RW process step and the time taken for replacing the rolls of each material after the completion of one RW process, and the RW process is a process in which the two rolls, To form a roll having a new laminated structure.

The specific structures of the RW process steps performed in the above Comparative Examples and Examples are as follows, and the results are shown in Table 1 below.

Example  RW process step

(Step B1) of bonding the first pressure-sensitive adhesive layer on the first release film to one surface of the polarizer to form a bonded body;

Step (2): Step (B2) of peeling the first base material from the laminate of Pre-manufactured Production Example 2 and joining to the first pressure-sensitive adhesive layer produced in the above-

Step 3: A step (B3 in Fig. 3) of peeling off the second base material of the joined body produced in the above two steps and bonding it to the third pressure-sensitive adhesive layer on the third release film,

Comparative example  RW process step

(Step (C1) of FIG. 4) of bonding the first pressure-sensitive adhesive layer on the first release film to one surface of the polarizer,

2): a step (C2) of bonding the? / 2 phase difference layer on the second substrate after peeling off the first release film of the joined body manufactured in the one step;

Step 3: A step ((C3) in Fig. 4) of peeling off the second base material of the joined body produced in the above two steps and bonding the second base material to the second adhesive layer on the second release film,

(Step C4) of peeling the second release film of the joined body produced in the above three steps and joining the? / 4 phase difference layer on the first base,

Step 5: A step (C5 in Fig. 4) of bonding the third pressure-sensitive adhesive layer on the third release film after peeling off the first base material of the joined body manufactured in the above four steps,

Experimental Example 1-1 Polarizer length (m) 1000 1000 500 Sum Example Replace rolls (hours) 3 3 3 21.5 Junction (time) 5 5 2.5 Comparative Example Replace rolls (hours) 5 5 5 35.8 Junction (time) 8.3 8.3 4.2 Experimental Example 1-2 Polarizer length (m) 500 500 500 500 500 Sum Example Replace rolls (hours) 3 3 3 3 3 27.5 Junction (time) 2.5 2.5 2.5 2.5 2.5 Comparative Example Replace rolls (hours) 5 5 5 5 5 46 Junction (time) 4.2 4.2 4.2 4.2 4.2

Referring to Table 1, it can be confirmed that the time for polarizing plate production is reduced compared with the case where a polarizing plate is manufactured by preparing the laminate of the present invention in advance (Example) and a polarizing plate is manufactured by a conventional method (Comparative Example).

100: substrate
101: first substrate
102: second substrate
201: + A plate layer (? / 4 retardation layer)
202: + C plate layer
203:? / 2 retardation layer
300: pressure-sensitive adhesive layer
301: first pressure-sensitive adhesive layer
302: second pressure-sensitive adhesive layer
303: Third pressure-sensitive adhesive layer
400: Polarizer
500: release film
501: first release film
502: Second release film
503: Third release film
600: laminate

Claims (7)

delete delete delete delete delete a) + C plate layer; A pressure-sensitive adhesive layer formed on the + C plate layer; And a + A plate layer formed on the pressure-sensitive adhesive layer, the laminate having a substrate on the lower surface of the + C plate layer and the upper surface of the + A plate layer;
b) peeling the first substrate formed on the upper surface of the + A plate layer, and bonding the polarizer having the first pressure-sensitive adhesive layer on the upper surface of the + A plate layer, wherein the first pressure- Joining to be located between the polarizers; And
c) separating a second substrate formed on a lower surface of the + C plate layer and bonding a second release film having a second pressure-sensitive adhesive layer on a lower surface of the + C plate layer, wherein the second pressure- Wherein the peeling force between the first substrate and the + A plate layer is lower than the peeling force between the second substrate and the + C plate layer, Wherein the difference in peel strength is 0.02 N / 25 mm or more. The method according to claim 6,
Wherein the pressure-sensitive adhesive layer contained in the laminate is an ultraviolet curable adhesive layer.

Images