JP3326211B2 - Manufacturing method of polarizing plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a specific protective sheet.
And a method for manufacturing a polarizing plate .

[0002]

2. Description of the Related Art As a polarizing plate to be laminated on a liquid crystal cell, a polarizing plate in which a cellulose triacetate film (commonly referred to as TAC) as a protective sheet is laminated on both sides of a polarizing element film using an adhesive is generally used. As the cellulose triacetate film for this purpose, in addition to a normal transparent cellulose triacetate film, one provided with ultraviolet blocking properties, one provided with scratch resistance, one provided with ultraviolet blocking properties and scratch resistance, ultraviolet blocking properties, A material having a scratch property, a moisture-proof property and a non-glare property is used.

Japanese Patent Application Laid-Open No. 58-50501 discloses that, among the conventional methods, a cellulose triacetate (ie, cellulose triacetate) film is most frequently used as a protective film for a polarizing film. It is described that a protective film, for example, a polycarbonate film, a polymethyl methacrylate film, a polyvinyl chloride film, and the like is difficult as a protective film in various points as compared with a cellulose triacetate film. In the invention of JP-A-58-50501, a layer of a saponified ethylene-vinyl acetate copolymer (that is, an ethylene-vinyl alcohol copolymer) is provided on at least one side of the polarizing film. As a method for providing a protective layer made of an ethylene-vinyl alcohol copolymer on a polarizing film, (a) a method of bonding a polarizing film and an ethylene-vinyl alcohol copolymer film,
(B) A method of applying a solution of an ethylene-vinyl alcohol copolymer on a polarizing film and drying the solution is adopted.

JP-A-57-64710 discloses that a vinyl alcohol-based polymer polarizing film (A) and a holding plate or / and a protective film (C) are composed of a partially saponified ethylene-vinyl acetate copolymer. The polarizing plate laminated via the adhesive layer (B) is shown. Here, examples of the holding plate include cellulose ester-based, polystyrene-based, acrylic-based, polyvinyl chloride-based, polyvinylidene chloride-based, polyester-based, polycarbonate-based, polyolefin-based, and polyamide-based films and sheets. It is stated that film materials such as nitrocellulose, polyolefin resin, vinyl chloride copolymer, vinylidene chloride copolymer and the like can be mentioned.

JP-A-57-20718 discloses a polarizing plate in which a transparent conductive film is formed on a polarizing plate in which a transparent film is laminated on at least one surface of a polarizing element film.
Here, as the transparent film, as a group A having good chemical stability, poly-4-methylpentene-1, polyacrylonitrile resin, phenoxy resin (curable type), polyphenylene oxide resin, epoxy resin, cellulose resin, A vinyl resin is mentioned, and as a group B having poor chemical stability, a styrene copolymer resin, a polycarbonate resin, a polysulfone resin, a polyethersulfone resin, a polyarylene ester resin and the like are mentioned. Among them, it is suggested that group B is recommended to be protected by a curable film.

Japanese Patent Application Laid-Open No. 3-130 filed by the present applicant
No. 702 discloses a polarized light having a layer structure of a crosslinked resin cured layer / vinyl alcohol polymer layer / adhesive layer / polarizing element film / adhesive layer / vinyl alcohol polymer layer / crosslinked resin cured layer. A functional laminated sheet is shown. A typical example of the crosslinked resin cured product layer is a cured product of a phenoxy ether type crosslinkable resin.

[0007]

However [0007] A polarizing plate of the cellulose triacetate film which is conventionally generic and protective layer, and so moisture permeability ^{1000g / m 2 · 2 hr ·} 80μm more cellulose triacetate film increased, gas permeability of about 1100cc / m ² · 24hr · 80μ
Due to its inherent properties such as m, the polarization function tends to decrease over time due to moisture and air permeation, and it is prone to saponification decomposition due to the acidic components contained in the adhesive. In addition, there are problems that the scratch resistance is small and the surface is easily damaged.

The invention disclosed in Japanese Patent Application Laid-Open No. 58-50501 is
It is intended to solve the above problems with the polarizing plate having a cellulose triacetate film as a protective layer, but in terms of moisture permeability, abrasion resistance, surface hardness, heat resistance, strength of the waist and the like. Still unsatisfied.

The invention disclosed in Japanese Patent Application Laid-Open No. 57-64710 is
Although the adhesion between the polarizing film and the protective layer is intended, the adhesiveness is not always sufficient, and a conventional protective layer is used, and there is a limit in performance.

The invention disclosed in Japanese Patent Application Laid-Open No. 57-20718 is
Although an attempt is made to improve the protective layer, the performance of the polarizing film tends to decrease due to the organic solvent remaining in the adhesive layer when the protective layer is laminated on the polarizing film. Further, when a crosslinked resin such as a phenoxy resin (curable type) resin is used, there is a problem that flexibility is impaired and the resin becomes brittle, and it is difficult to remove bubbles during lamination and bonding.

The invention disclosed in Japanese Patent Application Laid-Open No. 3-130702 is
The formation of a cured product layer of a crosslinkable resin represented by a phenoxy ether type crosslinkable resin requires a high temperature and time, so that the production cost becomes high. As the adhesive, a water-based adhesive is mainly used, but after the bonding operation, it is dried. However, there are disadvantages such as poor drainage during drying and a long time for drying.

An object of the present invention is to provide a method for manufacturing a polarizing plate that is advantageous in terms of quality and manufacturing steps under such a background.

[0013]

SUMMARY OF THE INVENTION A method for producing a polarizing plate of the present invention.
Has a layer structure of a vinyl alcohol-based polymer layer having photoisotropy (3) / a cured layer of an active energy ray-curable resin (4) as a protective sheet (34) , and has an active energy of
The cured layer (4) of acrylate or phos
Irradiation of ultraviolet rays or electron beams selected from phazen resin
A prepolymer or / and
Active energy ray-curable resin containing nomer as an essential component
Using a cured product layer, the protective sheet (34)
The surface of the vinyl alcohol polymer layer (3) side is polarized
The polarizing element is placed through the adhesive layer (2a) so that it is on the side of the base film (1).
Adhesive lamination on one side of the film (1) , and the polarizing element
On the other surface of the membrane (1), a moisture permeability of 100 g / m ² having optical isotropy is provided.
・ Moisture permeable sheet of more than 24hr (40 ℃, 90% RH, 30μm) (5)
Adhesively laminated via an adhesive layer (2b)
Things.

[0014] In this case, the active energy ray curable resin cured layer (4), be those formed from a polyisocyanate compound or a flexible epoxy resin radiation-curable resin composition containing a particularly desirable.

Hereinafter, the present invention will be described in detail.

[0016]<Protective sheet (34)>  <Protective sheet (34)> The present inventionAtThe protective sheet (34) is made of vinyl alcohol
Active energy ray-curable resin cured material layer on polymer layer (3)
(4) is formed.

<Vinyl alcohol-based polymer layer (3)> As the vinyl alcohol-based polymer in the vinyl alcohol-based polymer layer (3), polyvinyl alcohol, a copolymerized modified product thereof, a post-modified product thereof, or a graft thereof is used. Graft polymer used as substrate, more specifically (a) polyvinyl alcohol of various degrees of polymerization and saponification degree, (b) α-olefin (ethylene etc.), ethylenically unsaturated carboxylic acid or its ester, acrylonitrile, methacryloyl Including nitrile, acrylamide, methacrylamide, vinyl ether, vinyl esters other than vinyl acetate, copolymerized modified polyvinyl alcohol modified with any comonomer copolymerizable with vinyl acetate, (c) these polyvinyl alcohols or copolymerized modified polyvinyl alcohol Post-modified products (eg, urethane Goods and acetal product),
(d) An ethylenically unsaturated amide monomer (such as N-hydroxyalkyl (meth) acrylamide, N-alkoxyalkyl (meth) acrylamide) and an ethylenically unsaturated Examples include a graft polymer obtained by polymerizing a carboxylic acid-based monomer (such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid). Of these, polyvinyl alcohol and ethylene-vinyl alcohol copolymer are particularly important.

Since the vinyl alcohol-based polymer layer (3) is required to have photoisotropy (a retardation value of 50 nm or less, particularly 30 nm or less), it is formed by a casting method or obtained by an extrusion method. The resulting film is heat treated to reduce the orientation.

The thickness of the vinyl alcohol-based polymer layer (3) is suitably set in the range of about 2 to 150 μm, preferably 10 to 50 μm on a dry basis. The layer (3) may contain an antistatic agent or an ultraviolet ray cut agent.

<Active energy ray-curable resin cured product layer>
(4) ＞ The active energy ray-curable resin constituting the cured layer of the active energy ray-curable resin (4) has a property of being polymerized by irradiation with ultraviolet rays or electron beams (hereinafter, referred to as “photopolymerizable”). ), And a mono- or polyfunctional monomer, a variety of polymers, a photopolymerization initiator, and a sensitizer are blended with a prepolymer or / and a monomer as necessary. An antistatic agent can be added.

Here, examples of the photopolymerizable prepolymer include polyester acrylate, polyester urethane acrylate, epoxy acrylate, and polyol acrylate. Examples of the photopolymerizable monomer include monofunctional acrylate, difunctional acrylate, and trifunctional or higher acrylate. And the like. Of these, epoxy acrylates having good physical properties after curing are particularly useful, and it is desirable to use at least a part of them.

As the photopolymerizable prepolymer or monomer, a phosphazene resin can be used in addition to the above.

When the active energy ray-curable resin is an ultraviolet-curable resin, a small amount of a photoinitiator or a sensitizer is usually used in combination. There are cases. As the photoinitiator, acetophenones, benzophenones, Michler's ketone, benzyl, benzoin, benzoin ether, benzyl ketals, various photocuring agents including thioxanthones are used, and as the sensitizer, amines,
Various sensitizers including diethylaminoethyl methacrylate are used.

The above-mentioned cured layer of the active energy ray-curable resin (4) is formed of hexamethylene diisocyanate, diphenylmethane diisocyanate or hexamethylene diisocyanate in order to increase the adhesion to the vinyl alcohol polymer layer (3) which is in contact therewith. Modified product thereof, tolylene diisocyanate, isophorone diisocyanate, tolidine diisocyanate, lysine diisocyanate, xylylene diisocyanate,
It is preferably formed of an active energy ray-curable resin composition containing various polyisocyanate compounds such as naphthalene diisocyanate, tetramethyl xylene diisocyanate, and p-phenylene diisocyanate. In this case, the blending amount of the polyisocyanate compound is usually 30% by weight or less, particularly 1 to 20% by weight, based on the whole cured layer of the active energy ray-curable resin (4).

Further, an active energy ray-curable resin cured product layer
(4) In order to impart flexibility to the active energy ray-curable resin composition, a flexible aliphatic epoxy resin, for example, a urethane-modified epoxy resin, a polymer polyether having an epoxy resin skeleton A low-viscosity epoxy resin containing a polyol, an aliphatic polyglycidyl ether as a main component, a polyglycol diglycidyl ether, and an epoxy resin containing a hydrogenated bisphenol as a main component can be blended. In this case, the compounding amount of the flexible epoxy resin is 50% with respect to the entire active energy ray-curable resin cured product layer (4).
% Or less, especially 2 to 50% by weight.

Active energy ray-curable resin cured product layer (4)
The thickness can be appropriately set, but is often about 1 to 100 μm, particularly 2 to 20 μm.

<Polarizing plate> <Polarizing plateManufacturing ofThe polarizing plate of the present invention,・ Protective sheet above (34)ToIts vinyl alcohol-based heavy
Bond so that the surface on the coalescing layer (3) side faces the polarizing element film (1).
Of the polarizing element film (1) through the agent layer (2a)On one sideAdhesive laminationDo
And, and,  ・On the other surface of the polarizing element film (1), light having optical isotropy
100g / m moisture permeability with anisotropy ^Two ・ 24hr (40 ℃, 90% RH,
30 μm) or more through the adhesive layer (2b).
It is manufactured by adhesive lamination.

The layer constitution of the obtained polarizing plate is (4) / (3) / (2a) / (1) / (2b) / (5).

To facilitate attachment to a liquid crystal cell or the like,
On one side of the polarizing plate, a laminated sheet composed of an adhesive layer / peelable sheet can be adhered, and the peelable sheet can be peeled off at the time of use to adhere the adhesive face to the object.

<Polarizing Film (1)> Examples of the polarizing film (1) include polyvinyl alcohol / iodine, olefin-vinyl alcohol copolymer / iodine, polyvinyl alcohol / dichroic dye, and olefin-vinyl alcohol. Various polarized light having polarizing ability, including copolymer / dichroic dye system, olefin-vinyl alcohol copolymer / polyene system, polyvinyl alcohol / polyene system, polyvinyl halide / polyene system, polyacrylonitrile / polyene system A base film is used. In particular, those based on polyvinyl alcohol or ethylene-vinyl alcohol copolymer are important.

The thickness of the polarizing element film (1) is often about 10 to 100 μm, but is not necessarily limited to this range.

<Adhesive Layers (2a), (2b)> As the adhesive for the adhesive layers (2a), (2b), polyester resins having a hydrophilic group, polyamide resins having a hydrophilic group,
A polyurethane resin having a hydrophilic group, a polyester urethane resin having a hydrophilic group, a vinyl alcohol polymer such as polyvinyl alcohol, and a water-soluble polymer other than these are dissolved in an aqueous medium (water, water-water-miscible organic solvent) or Dispersed aqueous medium-based adhesive; adhesive composed of a solvent itself such as water-alcohol, water-alcohol-phenol or an adhesive in which an inorganic salt is dissolved; pressure-sensitive adhesive (that is, adhesive); urethane-based or polyester-based adhesive And an organic medium-based adhesive obtained by dissolving an acrylic-based, epoxy-based, or polyamide-based resin in an organic solvent; and an aqueous medium-based adhesive is particularly important. The adhesive can contain various auxiliaries in addition to the main agent, and can also contain an antistatic agent and an ultraviolet ray cut agent.

The thickness of the adhesive layers (2a) and (2b) is on a dry basis.
Usually, it is set to 0.3 to 50 μm, but it is not necessarily limited to this range.

<Moisture-permeable sheet (5)> As described above, as the moisture-permeable sheet (5), a moisture permeability of 100 g / m having optical isotropy (a retardation value of 50 nm or less, particularly 30 nm or less) is used. ^{m 2 · 24hr (40 ℃,} 90% RH,
A sheet of 30 μm) or more is used. Examples of such a moisture-permeable sheet (5) include cellulose triacetate, cellulose diacetate, cellulose acetate, cellulose acetate butyrate, ethyl cellulose, nylon 6, polyvinyl alcohol, and ethylene-vinyl alcohol copolymer having a relatively small ethylene content. , Polyurethane, polysulfone, polycarbonate, polystyrene,
Examples include sheets of polyacetal, polymethyl methacrylate, polyimide, and the like. The moisture permeable sheet (5) can contain an antistatic agent and an ultraviolet ray cutting agent if necessary.

<Usage> The polarizing plate obtained by the method of the present invention is used for optical applications requiring a polarizing function, for example, a polarizing plate laminated on a liquid crystal cell, a polarizing plate also serving as a liquid crystal cell, and a polarizing plate for goggles. Can be suitably used.

[0036]

The protective sheet (34) of the present invention has a layer structure of a vinyl alcohol polymer layer (3) / an active energy ray-curable resin cured layer (4).
When adhesive is laminated on one side of the polarizing element film (1) via the adhesive layer (2a), the polarizing element film (1) , which is susceptible to tearing alone, is effectively protected, and the vinyl alcohol-based polymer layer ( 3)
The air permeability is also excellent due to the presence of. Also, since the active energy ray-curable resin cured product layer (4) is arranged on the outermost layer, the moisture permeability, hardness, abrasion resistance,
Properties such as solvent resistance, chemical resistance, liquid crystal resistance, heat resistance, and stiffness are extremely excellent.

The formation of the outermost active energy ray-curable resin cured product layer (4) can be performed at a low temperature and in a very short time, which is extremely preferable from the viewpoint of productivity.

Active energy ray-curable resin cured product layer (4)
When an active energy ray-curable resin composition containing a polyisocyanate compound or a flexible epoxy resin is used to form the polyisocyanate compound, the adhesion to the vinyl alcohol-based polymer layer (3) is reduced when the polyisocyanate compound is used. When the active energy ray-curable resin composition is blended, the flexibility of the active energy ray-curable resin cured material layer (4) becomes moderate and troubles such as cracks occur during handling of the polarizing plate. Will not occur.

In addition, since the polarizing element film (1) and the vinyl alcohol-based polymer layer (3) are originally made of the same type of resin, an adhesive for forming the adhesive layer (2a) for bonding them is selected. Is easy, and a strong adhesive force is obtained.

[0040]In the present invention,On one side of the polarizing element film (1)
Protective sheet (34) above and moisture permeable sheet (5) on the other side
And glue and laminate each with adhesive layers (2a) and (2b)And  (4) / (3) / (2a) / (1) / (2b) / (5) polarizerSo thatDuring the drying process
The water in the adhesive layers (2a) and (2b) passes through the moisture-permeable sheet (5).
It will be removed smoothly, and high quality polarizing plate
There is a great advantage that it can be manufactured between. This layer structure
When attaching a polarizing plate to an object such as a liquid crystal cell,
The side of the wet sheet (5) faces an object such as a liquid crystal cell
By doing so, the outermost layer is an active energy ray-curable resin
Layer (4), exhibiting favorable properties of the layer (4)
Is done.

As described above, in the polarizing plate obtained by the method of the present invention, each layer exhibits its original characteristics, and the property lacking in one layer is covered by another layer. Further, the layers cooperate with each other to have optimal properties as a polarization functional material.

[0042]

The present invention will be further described with reference to the following examples. Hereinafter, “parts” are indicated on a weight basis.

<Preparation of Materials><Polarizing Element Film (1)> (1) -1 A dichroic dye-based polarizing element film having a thickness of 30 μm and comprising a glycidyl methacrylate grafted product of polyvinyl alcohol as a base material. (1) -2 A polyvinyl alcohol-iodine polarizing element film having a thickness of 35 μm. (1) -3 A polarizing film having a thickness of 30 μm and comprising a dichroic dye in an ethylene-vinyl alcohol copolymer having an ethylene content of 32 mol%.

<Adhesives for Adhesive Layers (2a) and (2b)> (2) -1 Aqueous dispersion (polyester urethane) having a solid content of 40% (NeoRez R-9314 manufactured by Kusumoto Kasei Co., Ltd.) 100 The composition contains 5 parts of a water-soluble epoxy curing agent (World Lock X-2030 manufactured by Kyoritsu Chemical Sangyo Co., Ltd.). (2) -2 10% aqueous solution of polyvinyl alcohol having a polymerization degree of 500 and a saponification degree of 88 mol%. (2) -3 20% aqueous solution of water-soluble nylon ("Toresin" manufactured by Teikoku Chemical Industry Co., Ltd.).

<Solution for vinyl alcohol-based polymer layer (3)> (3) -1 20 parts of ethylene-vinyl alcohol copolymer (manufactured by Kuraray Co., Ltd.) having an ethylene content of 32 mol%, 48 parts of water, n-
Solution consisting of 32 parts of propanol and 4 parts of methylolated melamine (Sumitec M-3 manufactured by Sumitomo Chemical Co., Ltd.).

<Active energy ray-curable resin cured product layer>
(4) Resin liquid for (4) -1) Epoxy acrylic resin "V-2" manufactured by Shin Nippon Chemical Co., Ltd.
550P ”in 100 parts of a hexamethylene diisocyanate-based low viscosity aliphatic polyisocyanate (“ Coronate DC-2797 ”manufactured by Nippon Polyurethane Industry Co., Ltd., viscosity 100 cp /
25 ° C.) 7 parts, urethane-modified epoxy resin which is an example of a flexible epoxy resin (“ZX010” manufactured by Toto Kasei Co., Ltd.)
1 ", viscosity 3000 cp / 50 ° C, epoxy equivalent 1300 g /
eq) An ultraviolet-curable resin liquid mixed with 10 parts and 0.2 parts of benzophenone. (4) -2 An ultraviolet-curable resin liquid according to (4) -1, wherein only the blending of the flexible epoxy resin is omitted. (4) -3 An ultraviolet-curable resin liquid in which the blending of the polyisocyanate compound and the flexible epoxy resin is omitted in (4) -1.

<Moisture-permeable sheet (5)> (5) -1 Thickness 50 μm, Moisture permeability about 900 g / m ² · 24 hr (40 ° C., 90% R
H, 30 μm) cellulose triacetate sheet (untreated surface). (5) -2 thickness 50 [mu] m, a moisture permeability of about ^{900g / m 2 · 24hr (40} ℃, 90% R
H, 30 μm) cellulose triacetate sheet (surface corona discharge treated product). (5) -3 thickness 50 [mu] m, a moisture permeability of about ^{900g / m 2 · 24hr (40} ℃, 90% R
H, 30 μm) cellulose triacetate sheet (surface treated with alkali). (5) -4 thickness 30 [mu] m, a moisture permeability of about ^{1300g / m 2 · 24hr (40} ℃, 90
% RH, 30 μm) polyvinyl alcohol sheet. (5) -5 thickness 30 [mu] m, a moisture permeability of about ^{100g / m 2 · 24hr (40} ℃, 90% R
H, 30 μm) ethylene-vinyl alcohol copolymer sheet (cast product).

<Manufacture of Polarizing Plate> Example 1 FIG. 1 is a sectional view showing an example of a polarizing plate obtained by the method of the present invention.

On a polyester film as a support, the above ethylene-vinyl alcohol copolymer solution (3) -1
Is applied using an applicator and dried at 80 ° C. for 10 minutes to form a 30 μm-thick vinyl alcohol-based polymer layer (3).
Was formed.

Next, the vinyl alcohol polymer layer
From above (3), apply the above ultraviolet curable resin liquid (4) -1 using an applicator, and irradiate with ultraviolet light under the following conditions to obtain a 12 μm thick active energy ray curable resin cured material layer ( After forming 4), the polyester film was peeled off to obtain a protective sheet (34) having a layer constitution of (3) / (4).・ Ultraviolet irradiation device: UVC-253 / 1MNLC3-AA08 manufactured by Ushio Inc. ・ Lamp: High pressure mercury lamp ・ Irradiation distance: 200mm ・ Conveyor speed: 3m / min

The aqueous polyvinyl alcohol solution of the above (2) -2 was dripped on the surface of the vinyl alcohol polymer layer (3) of the protective sheet (34), and the surface of the cellulose triacetate sheet of the above (5) -3 was dropped. Also, the polyvinyl alcohol aqueous solution of the above (2) -2 is dripped, and then the polarizing element film (1) -1 is layered between these two sheets and squeezed through the nip rolls while being laid down. Do
Then, it was dried at a temperature of 70 ° C. for 30 minutes. Although the water contained in the adhesive was dried for a short time, it was smoothly removed, and the adhesive layers (2a) and (2b) containing no air bubbles were obtained.

Thus, (4) / (3) / (2a) / (1) / (2b) / (5) The polarizing plate of FIG. 1 having the layer configuration of was obtained.

This polarizing plate has a very beautiful appearance,
It is flexible and has very good interlayer adhesion (90
゜ Peel strength is 450g / 25mm between (34) / (1), material destruction between (5) / (1)), and properties such as strength, hardness, abrasion resistance, and solvent resistance of the entire laminated sheet It is excellent. In addition, since it also has air permeability, there is an advantage that the stability of the polarizing element in the polarizing element film (1) is good and the life is long.

The surface of the moisture-permeable sheet (5) side has an adhesive layer /
The pressure-sensitive adhesive layer side of the laminated sheet composed of the peelable sheet was adhered. In use, the peelable sheet is peeled off and its adhesive surface is adhered to an object such as a liquid crystal cell.

Examples 2 to 5 According to Example 1, a polarizing plate having the following layer constitution was produced. The obtained polarizing plate had preferable properties equivalent to or equivalent to those in Example 1.

Example 2 Layer Structure of Polarizing Plate: (4) / (3) / (2a) / (1) / (2b) / (5) (1): (1) -2 (2a), (2b): (2) -2 (3): (3) -1 (4): (4) -2 (5): (5) -2

Example 3 Layer Structure of Polarizing Plate: (4) / (3) / (2a) / (1) / (2b) / (5) (1): (1) -3 (2a), (2b): (2) -1 (3): (3) -1 (4): (4) -1 (5): (5) -4

Example 4 Layer Structure of Polarizing Plate: (4) / (3) / (2a) / (1) / (2b) / (5) (1): (1) -1 (2a), (2b): (2) -3 (3): (3) -1 (4): (4) -1 (5): (5) -5

Example 5 Layer Structure of Polarizing Plate: (4) / (3) / (2a) / (1) / (2b) / (5) (1): (1) -1 (2a), (2b): (2) -2 (3): (3) -1 (4): (4) -3 (5): (5) -1

[0060]

[Effect of the Invention] As described in detail in the section of the action, towards the invention
The polarizing plate manufactured by the method has air resistance, moisture resistance, hardness, abrasion resistance, solvent resistance, chemical resistance, liquid crystal resistance, interlayer adhesion strength, flexibility, heat resistance, waist strength, etc. In addition to having the properties described above, industrial productivity is also excellent.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a polarizing plate obtained by a method of the present invention.

[Explanation of symbols]

(1) ... polarizing element film, (2a), (2b) ... adhesive layer, (3) ... vinyl alcohol-based polymer layer, (4) ... active energy ray-curable resin cured layer, (5) ... transparent Wet sheet, (34)… Protective sheet

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Hashimoto 1-4-16, Nihonbashi Bakurocho, Chuo-ku, Tokyo Inside Fujimori Industry Co., Ltd. (56) References JP-A-3-130702 (JP, A) JP-A Sho 55-12930 (JP, A) JP-A-59-151109 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 5/30

Claims (2)

(57) [Claims] (1)As a protection sheet (34)Has optical isotropy
Vinyl alcohol polymer layer (3) / active energy ray hard
Layer structure of the cured resin layer (4)Has its activity
The energy ray-curable resin cured layer (4) is
Or phosphazene-based resin
A prepolymer having the property of polymerizing upon irradiation or /
Energy ray curing with resin and monomer as essential components
Using a cured resin layer of a mold resin, Protective sheet (34), the vinyl alcohol-based polymer layer
(3) Adhesive layer (2) so that the surface on the side faces the polarizing element film (1)
a) bonding and laminating on one side of the polarizing film (1)
And On the other surface of the polarizing element film (1), a moisture-permeable film having optical isotropy is provided.
100g / m ^Two ・ Moisture permeability of more than 24hr (40 ℃, 90% RH, 30μm)
Adhesive lamination of the sheet (5) via the adhesive layer (2b) is required.
Characteristic method of manufacturing a polarizing plate. 2. An active energy ray-curable resin cured material layer (4).
Is formed from an active energy ray-curable resin composition containing a polyisocyanate compound and / or a flexible epoxy resin .
Construction method.