WO1995000876A1

WO1995000876A1 - Optical laminated sheet and production thereof

Info

Publication number: WO1995000876A1
Application number: PCT/JP1993/000877
Authority: WO
Inventors: Rinjiro Ichikawa; Hiroshi Komori; Haruyuki Tsuboi
Original assignee: Fujimori Kogyo Co., Ltd.
Priority date: 1993-06-28
Filing date: 1993-06-28
Publication date: 1995-01-05

Abstract

A process for producing an optical laminated sheet by supplying a resin fluid (2a) comprising an actinic-radiation-curable resin composition into a gap between an optically isotropic sheet (1) having a surface layer comprising a thermally crosslinking resin and a smoothening template material (3) having a smooth surface to thereby form an interposed layer (2b) and curing the layer (2b) by irradiating with an actinic radiation to thereby form an actinic-radiation-cured resin layer (2). The template material (3) usable herein includes a biaxially oriented polyethylene terephthalate film which has a surface roughness of 0.004 νm and does not cause corona discharge. As a result, the surface roughness of a free surface of the cured resin layer (2) can be reduced to, for example, 0.1 νm or less.

Description

Say 糸

Optical laminated sheet and its manufacturing technology

The present invention relates to an optical laminated sheet having extremely excellent surface smoothness, particularly to an optical laminated sheet suitable for an electrode substrate for producing a liquid crystal display panel. The present invention also relates to a method for industrially advantageously producing such an optical laminated sheet. Background technology

Conventionally, glass has been used as a substrate for transparent electrodes for liquid crystal displays.However, plastics have recently been used because of problems such as the inability to make them thin, poor impact resistance, and difficulty in mass production. In many cases, the present applicant has made several applications as described below. The crosslinked resin cured material layer in these applications means a thermally crosslinked resin layer.

For example, Japanese Unexamined Patent Publication (Kokai) No. 63-71892 states that at least one surface of a base material layer having a retardation value of 3 O nm or less composed of a sheet of polycarbonate resin or the like is provided on at least one surface. FIG. 1 shows an electrode substrate for a liquid crystal display panel in which a single-layer or multiple-layer protective layer made of a cured product of an air-permeable resin or a cross-linkable resin is provided on the anchor coat layer.

Japanese Patent Application Laid-Open No. Sho 644-50021 discloses that a laminated body of an air-permeable synthetic resin film layer and a crosslinked resin cured material layer has their respective air-permeable synthetic resin film layers facing each other. Laminated and integrated via the adhesive layer in the state An electrode substrate for a liquid crystal display panel having the configuration described above is shown. Japanese Patent Application Laid-Open No. 640000/1988 discloses that a cross-linking agent capable of reacting with the air-permeable synthetic resin film layer on both sides of the air-permeable synthetic resin film layer formed by the casting film forming method. A method for manufacturing an electrode substrate for a liquid crystal display panel in which a cured crosslinkable resin layer is formed directly by a casting method using the method described above.

Japanese Patent Application Laid-Open No. 2-137972 discloses that an alcohol-soluble UV-curable adhesive is provided on the resin layer side of a substrate sheet having a retardation value of 3 O nm or less having a resin layer having no solvent resistance. A laminate sheet for manufacturing a liquid crystal display panel is shown in which a laminate layer or a water-based thermosetting adhesive layer is laminated, and a release sheet is further laminated on the adhesive layer. As an example, a sheet having a layer structure of a resin sheet such as polycarbonate, a Z anchor coating layer, a gas-resistant synthetic resin layer, and a Z-funoxy ether-based crosslinked polymer layer is mentioned.

Japanese Patent Application Laid-Open No. 2-149898 / 1992 discloses an electrode support film with a transparent electrode having a configuration in which a transparent electrode is provided on one side of an electrode support film that can be wound into a roll. It shows a liquid crystal cell substrate with a transparent electrode, which is laminated and integrated by bonding to a base material with a luminescence value of 8 O nm or less and a light transmittance of 60% or more, and a resin film layer as an example of the electrode support film. Z anchor coating layer Crosslinkable cured resin layer, resin film layer Anchor coating layer Z Air-permeable synthetic resin film layer Crosslinked resin cured layer, crosslinked resin cured layer / air-permeable synthetic resin film layer Anchor coating Layer Resin Film layer Non-anchor coating layer Z Air-permeable synthetic resin film layer Z Cross-linked resin cured product layer, Cross-linked resin cured product layer Z Air-permeable synthetic resin film layer Z Adhesive Z impermeability temper synthetic resin film layer Z crosslinking resin Films having a layer structure such as a cured product layer are mentioned.

When the above-mentioned sheet substrate is used as an electrode substrate for manufacturing a liquid crystal display panel, a transparent electrode such as ITO is formed on the crosslinked resin cured material layer, and an alignment film is further provided thereon. Assemble into a liquid crystal cell. In this case, if the liquid crystal sealed between the substrates is TN (twisted * nematic) liquid crystal, slight irregularities on the substrate surface on the side where the transparent electrode is formed will have little effect on the product quality. This is because a liquid crystal display panel assembled from a liquid crystal cell using TN liquid crystal is achromatic, and a panel is acceptable if the shading is clear.

However, when the liquid crystal to be sealed between the substrates is STN (super * twisted, nematic) liquid crystal, the STN liquid crystal can be used, for example, at 270 ° even though the gap between the substrates is only about 5 to 6 urn. Since the twist is only about a degree, even if there are slight irregularities on the surface of the substrate on the side where the transparent electrode is formed, the display will be colored purple or 綠 and the screen will be very difficult to see. This was the biggest weakness of liquid crystal display panels using the Chix substrate. The above-cited electrode substrate according to the present applicant's application has not sufficiently solved this problem.

Under such a background, the present invention provides an optical laminated sheet having extremely excellent surface smoothness, particularly an optical laminated sheet suitable for an electrode substrate for manufacturing a liquid crystal display panel. It is an object of the present invention to provide a method for industrially advantageously producing a simple optical laminated sheet. Disclosure of the invention

The optical laminated sheet of the present invention can be activated directly or via an anchor coating layer on a single-layer or multi-layer optically isotropic sheet (1) in which at least the surface layer is a thermally crosslinkable resin layer. A laminated sheet provided with an energy ray-curable resin cured layer (2), wherein the active energy ray-curable resin cured layer (2) has a free surface having a surface roughness of 0.5 m or less, and a laminated sheet. It is characterized in that the retardation value of the entire container is 6Οηιη or less and the visible light transmittance is 60% or more.

In addition, the method for producing the optical laminated sheet of the present invention is a method for producing an optically isotropic sheet having at least a single-layer or multi-layer sheet whose surface layer is a thermo-crosslinkable resin layer and having or not providing an anchor coating layer. The resin liquid (2a) of the active energy ray-curable resin composition is supplied to a gap between the sheet (1) and the smoothing mold material (3) having a smooth surface, and the resin liquid (2a) is formed between the two. It is characterized in that the sandwiched layer (2b) is cured by irradiation with active energy rays to form an active energy ray-curable resin cured layer (2).

Hereinafter, the present invention will be described in detail. The terms “sheet”, “film”, and “layer” all mean thin layers, and do not limit the thickness.

As the optically isotropic sheet (1), a single-layer or multiple-layer optically isotropic sheet whose surface layer is at least a thermo-crosslinkable resin layer is used.

Among the above, examples of the heat crosslinkable resin in the heat crosslinkable resin layer include fu- noxy ether type crosslinkable resin, epoxy resin, acrylic resin, acryl epoxy resin, melamine resin, phenol resin and urethane resin.

Particularly preferred resins among the crosslinkable resins are represented by the following chemical formula 1. It is a phenoxy ether type polymer-CH zf—

(Wherein, R ^{1 to} R ⁶ are each hydrogen, a lower alkyl group having 1 to 3 carbon atoms or Br, R ⁷ is a lower alkylene group having 2 to 4 carbon atoms, m is an integer of 0 to 3, n Represents an integer of 20 to 300.) A cross-linking reaction of a polyfunctional compound as a cross-linking agent with the hydrogen portion of the hydroxyl group of this polymer gives a phenoxy ether-type cross-linked polymer. . As a crosslinking agent (polyfunctional compound) to be reacted to obtain a crosslinked polymer, a group having a high reactivity with a hydroxyl group, for example, an isocyanate group, a carboxyl group, or a reactivity inducing group in a carboxyl group (for example, halide, Active amides, active esters, acid anhydride groups, etc.), and compounds having two or more of the same or different mercapto are used, and polyisocyanates are particularly important.

Of the above, acrylyl resins include compounds containing at least three or more acryloyloxy and / or methacryloyloxy groups in the molecule (hereinafter, polyfunctional (meth) acryloyloxy groups). (Referred to as "containing compound") as a main component, and / or a composition containing a primary radical reactant thereof as a main component. Particularly preferred is a polyfunctional unsaturated monomer containing at least 3 or more (meth) acryloyloxy groups in the molecule, at least 50% by weight based on the total unsaturated monomers, An unsaturated monomer mixture containing preferably 70% by weight, particularly preferably 90% by weight or more, and A composition comprising the initial radical reactant.

The layers other than the thermally crosslinkable resin layer constituting the optically isotropic sheet (1) include a base layer, an air-permeable resin layer, and the like. Examples of the layer configuration of the optically isotropic sheet (1) include a thermo-crosslinkable resin layer Z base layer, a thermo-crosslinkable resin layer, an air-permeable resin layer Z, a thermo-cross-linkable resin layer, and an air-permeable resin. Layer Base layer Z Air-permeable resin layer Z Thermo-crosslinkable resin layer, thermo-crosslinkable resin layer Z Air-permeable resin layer Z Base layer Z Air-permeable resin layer, thermo-crosslinkable resin layer Air-permeable resin layer / An air-permeable resin layer Z is a thermo-crosslinkable resin layer. In the case of a laminated structure, an anchor coating layer or an adhesive layer can be provided between the layers. An anchor coating layer can be provided on the surface of the thermo-crosslinkable resin layer constituting the surface layer of the optically isotropic sheet (1), if necessary.

In the above, polycarbonate, polymethyl methacrylate, polyether sulfone, polysulfone, polyarylate, amorphous polyolefin, polyparabanic acid-based resin, polyamide, and the like are used as the base material layer.

The substrate layer preferably has a heat distortion temperature of 80 ° C. or higher. The base material layer is obtained by a casting method and an extrusion method, and its thickness is often about 30 m to 3 m.

Examples of the gas-permeable resin constituting the gas-permeable resin layer include a layer formed from a polymer containing 50% by mole or more of an acrylonitrile component, a vinyl alcohol component or a vinylidene halide component. Particularly, polymers having hydroxyl groups are important, such as polyvinyl alcohol or modified copolymers or grafts thereof, and ethylene-vinyl alcohol copolymers having an ethylene content of 15 to 50 mol%. The gas-permeable resin layer is usually formed by a casting method, and has an oxygen permeability (measured according to ASTM D-1434-75) of 30 cc, 24 hr · m ² · atm or less, especially 20 cc / m ^2. It is desirable that the pressure be 24 hr · m ² · atm or less, more preferably 10 cc, 24 hr · m ² · atra or less. The thickness of the air-permeable resin layer is suitably set in the range of 1 to 50 um, especially 2 to 20 um.

The active energy linear curable resin constituting the active energy ray curable resin cured layer (2) includes a photopolymerizable bleach polymer and / or monomer, and other monofunctional or polyfunctional monomers as necessary. A resin composition containing a polymer, a photopolymerization initiator, and a photosensitizer is used.

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

As the photopolymerizable polymer or monomer, a phosphazene resin represented by the above formula or the following chemical formula 2 is also preferably used.

R0 OR

\ /

N N

CH ₃

R0 \ / OR

R: -CH _z -)- ₂₀ -CC = CH ₂

R0 z ^p / ヽ OR II (Chemical Formula 2) ヽ 0. When the active energy ray-curable resin is an ultraviolet-curable resin, usually a small amount of a photoinitiator or a photosensitizer is used in combination. . Various photo-curing agents such as acetate phenones, benzophenones, michelaketone, benzyl, benzoin, benzoin ether, benzyl ketals, and thioxanthone are used as photoinitiators. Various sensitizers such as amines and getylaminoethyl methacrylate are used.

The resin composition usually does not contain a solvent, but if necessary, a small amount of a solvent may be used in combination.

The thickness of the active energy ray-curable resin cured layer (2) is set to an appropriately set force of 1 to 20 and especially 2 to 10 in many cases.

The optical laminated sheet of the present invention is preferably produced by the following first method. That is, the resin liquid (2a) of the active energy ray-curable resin composition is filled in the gap between the optically isotropic sheet (1) with or without the anchor coating layer and the smoothing mold (3) made of a smooth film. The resin liquid (2a) is supplied so as to be sandwiched between them in a layered manner. The optically isotropic sheet (1) is supplied in advance to the film forming roll (4a), and the smoothing material (3) is supplied in advance to the film forming roll (4b). The gap between (4) and (4b) is adjusted to a predetermined value. The rolls (4a) and (4b) for film formation should be configured so that they can be kept warm if necessary.

Next, the sandwiching layer (2b) is cured by irradiation with active energy rays to form an active energy ray-curable resin cured layer (2). Examples of the active energy include ultraviolet rays and electron beams. The integrated light amount and dose during irradiation of active energy are set to the optimum range in consideration of the thickness of the active energy ray-curable resin hardened layer (2), etc. The smooth peelability of (3) and the solvent resistance of the active energy ray-curable resin cured layer (2) should be ensured.

As a result, a laminate composed of the optically isotropic sheet (1) the cured layer of the active energy ray-curable resin (2) and the Z-smoothed mold material (3) can be obtained. The smoothing mold material (3) is peeled off to obtain a laminated sheet composed of the optically isotropic sheet (1) and the active energy ray-curable resin cured layer (2).

Examples of the smoothing mold material (3) include a biaxially stretched polyester film such as a biaxially stretched polyethylene terephthalate sheet, a biaxially stretched polybutylene terephthalate sheet, a biaxially stretched polyethylene naphtholate sheet, and the like. A stretched polypropylene film or the like is used, and in view of cost and smoothness, a biaxially stretched polyethylene terephthalate film is particularly important. In this case, if the surface has been subjected to corona discharge or flame treatment, it will be difficult to peel off the smoothing mold material (3) in the subsequent steps, so care should be taken to use a material that is not subjected to such treatment. .

These smooth films has a surface roughness 0.15wni less, preferably rather below 0.05 _W m, more is required to be less O.Olwm, surface roughness is greater than 0.15wm and the desired An optical laminated sheet having smoothness cannot be obtained. Among the biaxially stretched polyethylene terephthalate films described above, in which no filler is blended, the surface smoothness is significantly improved by the biaxial stretching, so that the smoothness can be increased to the utmost.

The second method for producing the optical laminated sheet according to the present invention is a method for producing an optically isotropic sheet (1) having or without an anchor coating layer or a smoothing mold (3) made of a smooth film. Energy beam hardness The resin liquid (2a) of the curable resin composition is cast, and while the casting layer is covered with the smoothing mold material (3) or the optically isotropic sheet (1), the holding layer ( While controlling the thickness of 2b), the sandwiching layer (2b) is cured by irradiation with active energy rays to form an active energy ray-curable resin cured layer (2).

A third method for producing the optical laminated sheet of the present invention comprises the step of forming a resin liquid (2a) of an active energy ray-curable resin composition on a light isotropic sheet (1) with or without an anchor coating layer. While controlling the thickness of the sandwiching layer (2b) while pressing the smoothed glass as the smoothing mold material (3) against the casting layer, irradiation with active energy rays is performed. In this method, the sandwiching layer (2b) is cured to form an active energy ray-curable resin cured layer (2). In this method, the used glass is used repeatedly.

The surface roughness of the free surface of the active energy ray-curable resin cured layer (2) of the laminated sheet obtained by each of the above methods is determined according to the degree of surface smoothness of the smoothed mold material (3) and the like. , Preferably 0.2 | Li m or less, more preferably O.lm or less. Generally, the surface roughness of a melt extruded film is 3 to 4 μπι for a 100-wm thick film, and the surface roughness of a cast film is 2-3 ttm for a 100-um thick film. However, the surface roughness of the free surface of the active energy ray-curable resin cured layer (2) is so small that it can be said that it is beyond common sense.

Further, the active energy ray-curable resin cured layer (2) of the laminated sheet also has excellent heat resistance, solvent resistance, and transparent electrode forming property.

The laminated sheet of the present invention has an overall retardation value of 6 O nm or less, preferably 3 O nm or less, and a visible light transmittance of 60% or more, preferably 70% or more desirable.

The photoisotropic sheet (1) obtained above is transparent on the active energy ray-curable resin-cured layer (2) of the laminated sheet composed of the Z-active energy ray-curable resin-cured layer (2). If an electrode is provided and an alignment film is formed thereon, a liquid crystal cell substrate can be manufactured.

For the formation of the transparent electrode, vacuum evaporation, sputtering, ion plating, metal spraying, metal plating, chemical vapor deposition, spraying, etc. are adopted, and sputtering is particularly important. As the material of the transparent electrode, metals such as Sn, In, Ti, Pb, and Tb or oxides thereof are mainly used, and the layer thickness of the transparent electrode is at least 100 angstroms, and furthermore, Usually, it is set to 200 angstrom or more.

Action

In the optical laminated sheet of the present invention, since the free surface of the active energy ray-curable resin cured layer (2) located on the surface of the laminated sheet has extremely high surface smoothness, for example, this is filled with STN liquid crystal. Even when it is used as an electrode substrate of a liquid crystal cell, the display does not appear to be very hard to see due to colors such as purple and blue on the display.

The invention's effect

In the optical laminated sheet of the present invention, for example, even when this is used as an electrode substrate of a liquid crystal cell in which STN liquid crystal is sealed, the display is colored in purple, blue, or the like, and the screen is extremely colored. It will not be difficult to see.

Together with a liquid crystal display panel have been increasing every year, the force to spread the STN liquid crystal system are remarkable ^s, the present invention, even when a brass Chicks substrate instead of the glass base plate for the application, the display characteristics Comparable It is two things.

In spite of obtaining such excellent performance, it has an industrial advantage that its manufacturing process is simple. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a process diagram showing an example of a production process of the optical laminated sheet of the present invention. The meanings of the reference numerals in the figure are as follows.

(1)… light isotropic sheet,

(2)… Activity energy

(2a)… Resin liquid, (2b) ·

(3)… Smoothing type material,

(4a), (4b) ... film forming port

(5)… tank,

(6)… Sketch,

(7)… Discharge port,

(8)… UV irradiation equipment,

(9) ... nip roll,

(10)… peeling roll,

(S) ... Laminated sheet Best mode for carrying out the invention

Next, the present invention will be further described with reference to examples. Hereinafter, “parts” means parts by weight.

Example 1

FIG. 1 is a process chart showing an example of a production process of the optical laminated sheet of the present invention. In FIG. 1, (5) is a tank, (6) is a jacket, (7) a lip-shaped discharge port, and (4a) and (4b) are a pair of film forming rolls. (8) is an ultraviolet irradiation device. (9) is a nip roll, and (10) is a peeling roll for peeling off the laminated sheet.

As an example of the base material layer, a water-soluble quaternized ester urethane-based anchor coating agent is applied to one surface of a polycarbonate sheet (thickness: 110 μm, retardation value: 12 nm), dried, and dried to a thickness of 0.5 wni. After the anchor coating layer is formed, 20 parts of ethylene-vinyl alcohol copolymer having an ethylene content of 32 mol%, 45 parts of water, 50 parts of n-propanol, and methylolated melamine (above the anchor coating layer) Sumitec M-3 manufactured by Sumitomo Chemical Co., Ltd. 3) A resin solution having a composition of 4 parts was cast and passed through a dryer at a temperature of 110 ° C. to be dried. As a result, an air-permeable resin layer having a thickness of 8 iim was formed.

Similarly, an anchor coating layer having a thickness of 0.5 m is provided on the other surface of the polycarbonate sheet as the base material layer, and an air permeability of 8 urn having the same thickness as described above is formed on the anchor coating layer. A resin layer was provided.

Next, from the top of the air-permeable resin layer on one side, 40 parts of phenoxy ether resin (manufactured by Toto Kasei Co., Ltd.), 40 parts of methyl ethyl ketone, 20 parts of soguchi acetate, 20 parts of tri-range sociate A 75% solution of an adduct of trimethylolpropane and a neat compound (Coronet L, manufactured by Nippon Polyurethane Co., Ltd.) was coated with a curable resin composition having a composition of 40 parts by using Abrique overnight. After drying at 8 ^OeC for 4 minutes, the mixture was heated at 130 ° C for 20 minutes to form a phenoxy ether resin-based thermally crosslinkable resin layer having a thickness of 10 m. Similarly, a 10 μm-thick thermally crosslinkable resin layer was formed on the other air-permeable resin layer.

As a result, an optically isotropic sheet having a layer structure of a heat-crosslinkable resin layer, an air-permeable resin layer, a Z anchor coating layer, a base layer / anchor coating layer, an air-permeable resin layer, and a heat-crosslinkable resin layer. (1) was obtained.

Separately, a biaxially stretched polyethylene terephthalate film (0 type, manufactured by Teijin Limited) with a thickness of 50 im and a surface roughness of 0.004 um, which has not been subjected to corona discharge treatment, is prepared as a smoothing mold material (3). did.

One part of benzophenone was added to 100 parts of epoxyacrylic resin “V-254PA” manufactured by Nippon Steel Chemical Co., Ltd., to prepare a resin liquid (2a) of an active energy ray 5L arsenic resin composition.

This resin liquid (2a) was charged into a tank (5), and a heating medium was sent to a jacket (6) to keep the contents at about 3 (TC and degas).

Then, pressure was applied to the upper space of the tank (5), and the resin liquid (2a) was discharged from the discharge port (7) into the gap between the film forming rolls (4a) and (4b).

The film-forming rolls (4a) and (4b) are supplied with the above-mentioned optically isotropic sheet (1) and the smoothing mold material (3) in advance, respectively. The resin discharged from the discharge roller (7) The liquid (2a) was sandwiched between the thermally crosslinkable resin layer surface of the optically isotropic sheet (1) and the smooth surface of the smoothing mold material (3) to form a sandwiching layer (2b).

After passing through the film-forming rolls (4a) and (4b), the sandwiched sheet was irradiated with ultraviolet light by an ultraviolet irradiation device (8) under the following conditions, and then the smoothing mold material (3) was peeled off. The sandwiching layer (2b) was cured by the irradiation of ultraviolet rays, and became an active energy ray-curable resin cured layer (2). As a result, a laminate having a layer structure of the active energy ray-curable resin cured layer (2) / optically isotropic sheet (1) is obtained. Sheet (S) was obtained. The peeling and removal of the smoothing mold material (3) may be performed at a later date after being wound on a winder once instead of immediately after the ultraviolet irradiation.

UV irradiation conditions

Ultraviolet irradiation equipment V Shio Electric Co., Ltd. U V C-25 31 M lamp High pressure mercury lamp 80 WZcm or 1 200

W / cm

Irradiation distance 200 mm

Conveyor speed 5 m / min or 3 m / min

Table 1 shows the conditions and results. The meanings of the evaluation items are as follows.

•thickness

(2) The thickness is the thickness of the energy-curable resin cured layer (2) formed.

Smoothing: Smooth peeling of biaxially stretched polyethylene terephthalate film as mold material (3). (〇: good, X: bad)

• Roughness

The surface smoothness of the free surface of the active energy ray-curable resin cured layer (2) is measured by a non-contact type surface roughness meter using light interference.

• R value

Retardation value of the whole laminated sheet (S).

• transmittance

Visible light transmittance of the entire laminated sheet (S).

• Hardness

Pencil hardness

• Solvent resistance The laminated sheet (S) was immersed in dimethyl acetate at 44 ± 1 ° C for 5 minutes, and the presence or absence of dissolution of the active energy ray-curable resin cured layer (2) was observed. (〇: No abnormality, X: Dissolution) Table 1

Integrated light intensity (2) Thickness Releasing Roughness R value Transmittance Hardness Solvent resistance

No. MJ / c ² } (U m) (um) (nm) (%)

1 354 3.6 〇 <0.1.16 90 4H 〇

2 354 4.5 〇 <0.1.16 89 4H 〇

3 538 6.8 〇 <0.1.17 89 5H 〇

4 675 7.7 〇 0.1 0.1 17 88 5H 〇

Next, the active energy linear curing type resin cured layer (2) of the laminated sheets (S) of No. 1 to No. 4 obtained above was subjected to a sputtering process to form a 500 Å thick IT 0. A transparent electrode composed of layers was directly formed. Using this sheet as an electrode substrate, an alignment film was formed and rubbed, a liquid crystal cell was assembled, and a retardation plate and a polarizing plate were laminated by a conventional method to produce a liquid crystal display panel. The obtained liquid crystal display panel showed no coloration in the display, and had performance comparable to that of a liquid crystal display panel using glass as a substrate.

Example 2

The same procedure as in Example 1 was carried out except that a polycarbonate sheet (polyester sheet, 100 m thick, retardation value: 15 nm) was used instead of the polycarbonate sheet. An isotropic sheet (1) was obtained.

Idemitsu Petrochemical Co., Ltd. phosphazene-based curable resin "Idemitsu PP One part of benzophenone was added to 100 parts of "Z" to prepare a resin liquid (2a) of an active energy ray-curable resin composition.

Example 1 was repeated except that the above-described optically isotropic sheet (1) and the resin liquid (2a) were used. Table 2 shows the conditions and results. Table 2

Cumulative light intensity (2) Thickness Peelability Roughness R value Transmittance Hardness Solvent resistant (inJ / cni ² ) (m) (um) (nm) (¾)

354 4.0 〇 <0.1.18 89 7H 〇

538 6.8 〇 <0.1 18 89 7H 〇

Example 3

In No. 1 to No. 4 of Example 1, the heat-crosslinkable resin layer Z air-permeable resin layer / anchor coating layer Base material layer Z anchor coating layer air-permeable resin layer No heat-crosslinkable resin layer An anchor coating layer having a thickness of lm with a commercially available solvent-type urethane-based anchor coating agent is formed on one of the heat-crosslinkable resin layers of the optically isotropic sheet (1) having a structure. When Example 1 was repeated except that the resin liquid (2a) was brought into contact with the surface on the side of the ring layer, almost the same results as in Example 1 were obtained.

Example 4

On a polyester film, 20 parts of an ethylene-vinyl alcohol copolymer having an ethylene content of 32 mol%, 45 parts of water, 50 parts of n-propanol, and methylolated melamine (Sumitec M-3 manufactured by Sumitomo Chemical Co., Ltd.) ) A resin solution composed of 4 parts is cast and passed through a dryer at a temperature of 110 ° C and dried to form an air-permeable resin layer with a thickness of 15 jum. I let it. The same thermosetting resin composition as in Example 1 was applied from above, dried, and heated to form a 10-inch-thick thermally crosslinkable resin layer.

A urethane-based adhesive solution is applied on the air-permeable resin layer of the obtained laminated film, dried, and then, the surface of the air-permeable resin layer side of the same laminated film as above is placed on top of it and pressed. After left overnight, the polyester films on both sides were peeled off. As a result, an optically isotropic sheet (1) having a layer configuration composed of the heat-crosslinkable resin layer, the air-permeable resin layer / adhesive layer Z, and the air-permeable resin layer was obtained.

Using this optically isotropic sheet (1), an active energy ray-curable resin cured layer (2) having a thickness of 4 was formed on one surface in the same manner as in Example 1, and the other surface was subsequently applied. An active energy ray-curable resin cured layer (2) having a thickness of 4.0 / ι ιη was formed. The surface roughness of the active energy ray-curable resin cured layer (2) surface of the obtained laminated sheet (S) was 0.1 Um or less on both surfaces.

Example 5

The resin liquid (2a) of Example 1 was cast on the surface of the thermo-crosslinkable resin layer of the optically isotropic sheet (1) of Example 1, and the casting layer was used as a smoothing mold material (3). While pressing the glass having a surface roughness of 0.05 mn, the thickness of the sandwiching layer (2b) was controlled to 5.0 wm while irradiating with ultraviolet light, and then the glass was peeled off. The surface roughness of the active energy ray-curable resin cured layer (2) surface of the obtained laminated sheet (S) was 0.1 m or less. Industrial applicability

The optical laminated notebook obtained by the method of the present invention is a liquid crystal display panel. Although it is particularly important as an electrode substrate for manufacturing a film, it can also be applied to applications such as a member for a retardation plate, a member for a polarizing plate, an optical disk, and an optical card.

Claims

Scope of word blue

1. At least a single-layer or multi-layer photo-isotropic sheet whose surface layer is a thermo-crosslinkable resin layer) has an active energy ray-curable resin cured layer (2) directly or via an anchor coating layer. In the laminated sheet provided, the surface roughness of the free surface of the active energy ray-curable resin cured layer (2) is not more than, the retardation value of the entire laminated sheet is not more than 60 run, visible light Optical laminated sheet with transmittance of 60% or more.

2. At least a single-layer or multi-layer sheet whose surface layer is a thermo-crosslinkable resin layer, with or without an anchor coating layer (1) and a smoothing mold having a smooth surface The resin liquid (2a) of the active energy ray-curable resin composition is supplied to the gap with (3) so that the resin liquid (2a) is sandwiched between the two in a layered manner. A method for producing an optical laminated sheet, characterized in that the sandwiching layer (2b) is cured to form an active energy ray-curable resin cured layer (2).