WO1995000875A1

WO1995000875A1 - Optical laminated sheet and production thereof

Info

Publication number: WO1995000875A1
Application number: PCT/JP1993/000876
Authority: WO
Inventors: Rinjiro Ichikawa; Hiroshi Komori; Haruyuki Tsuboi
Original assignee: Fujimori Kogyo Co., Ltd.
Priority date: 1991-12-16
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 a base sheet (1) made of polycarbonate, polyarylate or the like 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 method

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 manufacturing 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, blastics have recently been used due to problems such as the inability to be made thin, poor impact resistance, and difficulty in mass production. The use of substrates is increasing, and the applicant has also filed several applications as described below.

For example, Japanese Unexamined Patent Publication (Kokai) No. 63-71892 states that at least one side of a base material layer made of a sheet of a polycarbonate resin or the like and having a retardation value of 3Οηιη or less has an aqueous anchor coat layer. After that, an electrode substrate for a liquid crystal display panel is shown in which a single-layer or multiple-layer protective layer made of a gas-permeable resin or a cured cross-linkable resin is provided on the anchor coat layer. .

Japanese Patent Application Laid-Open No. Sho 64-50021 discloses that a laminate of an air-permeable synthetic resin film layer and a crosslinked resin cured material layer has their respective air-permeable synthetic resin film layer surfaces facing each other. An electrode substrate for a liquid crystal display panel having a configuration integrated and laminated via an adhesive layer in a state 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 ultraviolet-curable adhesive is provided on the resin layer side of a substrate sheet having a retardation value of 3ηηιη or less having a resin layer having no solvent resistance. A laminate sheet for laminating a liquid crystal display panel is shown in which a layer or a water-based thermosetting adhesive layer is laminated, and a releasable 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-fuoxy ether-based crosslinked polymer layer is mentioned.

Japanese Patent Application Laid-Open No. 2-149898 / 1992 discloses that the electrode support film side of an electrode support film with a transparent electrode having a configuration in which a transparent electrode is provided on one side of a rollable electrode support film is lettered. It shows a liquid crystal cell substrate with a transparent electrode, which is laminated and integrated with a base material with a lightness value of 8 O nm or less and a light transmittance of 60% or more, and a resin film as an example of the electrode support film. Layer Z anchor coating layer Crosslinkable resin cured layer, resin film layer Anchor coating layer / air-permeable synthetic resin film layer Z cross-linked resin cured layer, crosslinked resin cured layer Z Air-permeable synthetic resin film layer / Anchor coating layer / resin film layer Anchor coating layer Z Air-permeable synthetic resin film layer Cross-linked resin cured product layer, Cross-linked resin cured product layer Air-permeable synthetic resin film layer Adhesive layer Z A film having a layer structure such as an air-permeable synthetic resin film layer, a cross-linkable resin cured product layer, and the like is mentioned. <Problems to be solved by the invention>

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, if 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 μm. 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 the liquid crystal display panel using the 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 an optical laminated sheet. Disclosure of the invention The optical laminated sheet of the present invention is a laminated sheet in which an active energy linearly curable resin cured layer (2) is provided directly or via an anchor coating layer on an optically isotropic substrate sheet (1). The surface roughness of the free surface of the active energy linear curable resin cured layer (2) is 0.5 wm or less, the retardation value of the whole laminated sheet is 6 O nm or less, and the visible light transmittance is 6 0% or more. Further, the method for producing an optical laminated sheet of the present invention comprises the steps of: providing an optically isotropic base sheet (1) with or without an anchor coating layer; and a smoothing mold (3) having a smooth surface. The resin liquid (2a) of the active energy ray-curable resin composition is supplied to the gap between the two, so that the resin liquid (2a) is sandwiched between the two layers, and then the active energy ray is applied to hold the resin liquid (2a). The layer (2b) is cured 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.

Examples of the optically isotropic substrate sheet (1) include polycarbonate, polymethyl methacrylate, polyether sulfone, polysulfone, polyarylate, amorphous polyolefin, polyparabanic acid-based resin, and polyamide. A crosslinked resin cured layer, an air-permeable resin layer, and the like may be laminated on the back side. Examples of such a layer configuration include a base sheet layer, a base sheet layer, a Z base sheet layer, a base sheet layer, an air-permeable resin layer, a base sheet layer, a crosslinked resin cured layer, and a base sheet layer / There are air-permeable resin layer / crosslinked resin cured material layer, base sheet layer / air-permeable resin layer Z, air-permeable resin layer / base sheet layer, and the like. In the case of a laminated structure, an anchor coating layer or an adhesive layer Can be provided. An anchor coating layer can be provided on the surface of the base sheet (1).

It is desirable that the substrate sheet (1) has a heat deformation temperature of 80 ° C or more. The base sheet (1) is obtained by the casting method and the extrusion method, and its thickness is often about 30 urn to 3 mm.

In the above, examples of the crosslinkable resin in the crosslinked resin cured material layer include phenoxy ether type crosslinkable resins, epoxy resins, acrylic resins, acrylic epoxy resins, melamine resins, phenol resins, and urethane resins.

A particularly preferred resin among the crosslinkable resins is a phenoxy ether type polymer represented by the following chemical formula 1.

R ¹

(Formula 1)

R '

(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 the 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, Compounds having two or more active amides, active esters, acid anhydride groups, etc.) In particular, polysocials are important.

Among the above, acrylyl resins include compounds containing at least three or more acryloyloxy groups or Z and methylacryloyloxy groups in the molecule (hereinafter, polyfunctional (meth) acryloyloxy). A polyfunctional unsaturated monomer whose main component is a compound containing an xyl group) and a composition whose main component is an initial radical reactant thereof. 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, Preferably, it is a composition comprising an unsaturated monomer mixture containing 70% by weight, particularly preferably 90% by weight or more, and / or an initial radical reactant thereof.

Examples of the gas-permeable resin constituting the gas-permeable resin layer include, for example, a polymer formed from a polymer containing 50 mol% or more of an acrylonitrile component, a bul alcohol component, or a vinylidene halide component. Particularly, a polymer having a hydroxyl group such as polyvinyl alcohol or a copolymer modified or grafted product thereof, and an ethylene-vinyl alcohol copolymer having an ethylene content of 15 to 50 mol% is important. .

The air-permeable resin layer is usually formed by a casting method, and has an oxygen permeability (measured according to AST D-1434-75) of 30 cc, 24 hr · m ² · atm or less, especially 20 cc. / 24hr · m ² · atm or less and still more ^{1 0 ccZ 24hr · m 2 ·} atm or less it is desirable. The thickness of the air-permeable resin layer is suitably set in the range of 1 to 50 urn, particularly 2 to 20 ym.

The active energy linear curable resin constituting the active energy ray curable resin cured layer (2) includes a prepolymer or Z and a monomer having photopolymerizability, and other monofunctional or polyfunctional monomers as necessary. A resin composition containing a seed polymer, a photopolymerization initiator, and a sensitizer is used.

Here, examples of the photopolymerizable polymer include polyester acrylate, polyester urethane acrylate, epoxy acrylate, and polyol acrylate.Examples of the photopolymerizable monomer include monofunctional acrylate, Examples include bifunctional 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 blepolymer or monomer, a phosphazene-based resin represented by the following chemical formula 2 is preferably used in addition to the above.

(Chemical 2

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. . As the photoinitiator, various photocuring agents including acetate phenones, benzophenones, Michlerketone, benzyl, benzoin, benzoin ether, benzylketals, and thioxanthone are used. Sensitizers include amines, getylaminoethyl methacrylate Various types of sensitizers, such as birds, 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) can be set as appropriate; 220 im, especially 2 L: often L O / im.

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 provided in the gap between the base sheet (1) and the smoothing film made of a smooth film (3). The resin liquid (2a) is supplied so as to be sandwiched between both layers. The base sheet (1) is supplied to the film forming roll (4a) in advance, and the smoothing mold material (3) is supplied to the film forming roll (4b) in advance, and both the film forming rolls (4a), ( The gap between 4b) is adjusted to a predetermined value. The ports (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 quantity and dose during irradiation with active energy are set to the optimal range in consideration of the thickness of the active energy ray-curable resin cured layer (2), etc., and the smooth peeling property of the smoothed mold material (3) is determined. The solvent resistance of the active energy ray-curable resin cured layer (2) should be ensured.

As a result, a laminate composed of the base sheet (1) Z-active energy ray-curable resin cured layer (2) / smoothed mold material (3) is obtained, and the laminate is smoothed at any subsequent stage. The coating material (3) is peeled off to obtain a laminated sheet comprising a base material sheet (1) a cured Z-active energy ray-curable resin layer (2). Examples of the smoothing mold material (3) include biaxially stretched polyester films such as biaxially stretched polyethylene terephthalate sheet, biaxially stretched polyethylene terephthalate sheet, and biaxially stretched polyethylene naphthalate sheet; For example, a biaxially oriented polypropylene film is used. In view of cost and smoothness, a biaxially oriented 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 are required to have a surface roughness of 0.15 wm or less, preferably 0.05 ym or less, and even 0.01 or less, and have a surface roughness of 0.15 ίχηι. When it becomes too large, it becomes impossible to obtain an optical laminated sheet having the intended smoothness. 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 of the present invention comprises the steps of providing an active energy to one of the base sheet (1) provided with or without an anchor coating layer or the smoothed mold material (3) formed of a smooth film. The resin liquid (2a) of the line-curable resin composition is cast, and while the casting layer is covered with the smoothing material (3) or the base 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).

The third method for producing the optical laminated sheet of the present invention comprises the steps of: forming an active energy on a base sheet (1) provided with or without an anchor coating layer. The resin liquid (2a) of the lugi straight-curing resin composition is cast, and the smoothing glass as the mold material (3) is pressed against the casting layer while the thickness of the sandwiching layer (2b) is maintained. This is a method in which the sandwiching layer (2b) is cured by irradiation with active energy rays while controlling the thickness of the 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 may be 0.5% depending on the degree of surface smoothness of the smoothed mold material (3). ίχπι or less, preferably 0.2 wni or less, more preferably 0.1 wm or less. Generally, the surface roughness of a melt-extruded film is 3 to 4 μm for a 100-m thick film, and the surface roughness of a cast film is 2-3 μm for a 100-thick film. The surface roughness of the free surface of the cured layer (2) is so small that it can be said that it is not 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 7 Desirably, it is 0% or more.

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

Transparent electrodes are formed by vacuum deposition, sputtering, ion plating, metal spraying, metal plating, chemical vapor deposition, The Leh method is used, and the sputtering method 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, the surface smoothness of the free surface of the active energy ray-curable resin cured layer (2) located on the surface of the laminated sheet is extremely high. Even when it is used as an electrode substrate of a liquid crystal cell to be sealed, it does not cause the screen to be very hard to see because the display is colored in purple or green.

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 purple, green, or the like, and the screen is extremely dark. It does not cause the situation to be difficult to see.

While the size of liquid crystal display panels is increasing year by year, and the spread of STN liquid crystal systems is remarkable, the present invention has inferior display characteristics even if a plastics substrate is used in place of a glass substrate for the purpose. There is no such thing.

In spite of obtaining such excellent performance, there is an industrial advantage that the manufacturing process is a thimble. 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)… Base sheet,

(Γ)… Light isotropic sheet,

(2) ... active energy ray-curable resin cured layer.

(2a) ... resin liquid, (2b) ... sandwiching layer,

(3)… Smoothing 铸

(4a), (4b) ... roll for film formation,

(5)… tank,

(6) ... jacket,

(7)… Discharge port,

(8)… UV irradiation equipment,

(9)… two rolls,

(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 release roll for releasing the laminated sheet (S).

As an example of the base material sheet (1), one side of a polycarbonate sheet (thickness 110 urn, retardation value 12 nm) is water-soluble and quaternized. An ester urethane-based anchor coating agent is applied and dried to form a 0.5 μm-thick anchor coating layer. Then, from the top of the anchor coating layer, ethylene-vinyl having an ethylene content of 32 mol% is added. A resin solution having a composition consisting of 20 parts of an alcohol copolymer, 45 parts of water, 50 parts of n-propanol, and 4 parts of methylolated melamine (Sumitec M-3 manufactured by Sumitomo Chemical Co., Ltd.) was cast at a temperature of 1 part. It was dried by passing through a dryer at 10 ° C. As a result, an air-permeable resin layer having a thickness of 8 urn was formed.

Then, from the top of the air-permeable resin layer, 40 parts of phenoxy ether resin (manufactured by Toto Kasei Co., Ltd.), 40 parts of methyl ethyl ketone, 20 parts of cellosolve acetate, and tolylene diisocyanate A curable resin composition consisting of 40 parts of a 75% solution of an adduct with trimethylolpropane (Coronet L, manufactured by Nippon Polyurethane Co., Ltd.) was applied using an applicator, and was applied at 8 CTC. After drying for 4 minutes, the mixture was heated at 130 ° C. for 20 minutes to form a phenoxy ether resin-based crosslinked resin cured material layer having a thickness of 10 °.

As a result, a photoisotropic sheet (Γ) having a layer structure of the base sheet (1) a gas-permeable resin layer and a crosslinked resin cured material layer was obtained.

Separately, prepare a smoothed鐯型material (3), the thickness 5 0 m, the surface roughness 0. 004 _W m biaxially oriented polyethylene terephthalate film that is not corona discharge treatment of the (Teijin Ltd. 0 type) did.

A resin solution (2a) of an active energy ray-curable resin composition was prepared by adding 1 part of benzophenone to 100 parts of epoxyacrylic resin “V-254PA” manufactured by Shin-Tetsu Iron & Chemicals Co., Ltd. .

This resin liquid (2a) was charged into a tank (5), a heating medium was sent to a jacket (6) to keep the content at about 30 ° C, and deaerated. 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 (Γ) and the smoothing mold material (3) in advance, respectively. The resin discharged from the discharge roller (7) The liquid (2a) was sandwiched between the surface of the base sheet (1) of the optically isotropic sheet (Γ) and the smooth surface of the smoothing mold member (3) so as to form a sandwiching layer (2b).

The sandwiched sheet after passing through the film forming rolls (4a) and (4b) 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 laminated sheet (S) having a layer configuration of the active energy ray-curable resin cured layer (2) and the Z-light isotropic sheet (Γ) 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

UV irradiator ゥ Shio Electric Co., Ltd. UV C-2 53/1 M lamp High pressure mercury lamp 80 WZcm or 120

W / cm

Irradiation distance 200

Conveyor speed 5 m / min r 3 m / min

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

•thickness

(2) Thickness is the thickness of the formed energy ray-curable resin cured layer (2). • Peelability Smoothness 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

The letter value of the entire laminated sheet (S).

Transmittance

Laminated sheet) Overall visible light transmittance.

Hardness

Pencil hardness

Solvent resistance

The laminated sheet (S) was immersed in dimethyl acetate amide at 44 ± 1 ° C for 5 minutes to observe the dissolution of the active energy ray-curable resin cured layer (2). (〇: No abnormality, X: Dissolution) Table 1

Total light intensity (2) Thickness Peelability Roughness R value Transmittance Hardness Solvent resistance

No. (mJ / ctn ') (u m) (u m) (run) (%)

1 354 3.5 〇 <0.1 15 91 4H 〇

2 354 4.0 〇 <0.1 15 90 4H 〇

3 538 7.0 〇 <0.1 15 90 5H 〇

4 675 8.0 〇 <0.1 15 89 5H 〇

Next, the thickness of the cured sheet (2) of the active energy linear curable resin (2) of No. 1 No. 4 laminated sheet (S) obtained above was sputtered. A transparent electrode consisting of a 500 angstrom IT0 layer 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

Example 1 was repeated except that a polycarbonate sheet (polyester sheet (manufactured by Kaneka Chemical Co., Ltd., thickness 100 oo un !, letter de-tion value: 15 mn)) was used instead of the polycarbonate sheet as the base sheet (1). An optically isotropic sheet (Γ) was obtained in the same manner as in 1.

A resin solution (2a) of an active energy ray-curable resin composition was prepared by adding 1 part of benzophenone to 100 parts of a phosphazene-based curable resin “Idemitsu PPZ” manufactured by Idemitsu Petrochemical Co., Ltd.

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

Integrated light intensity (2) Thickness Releasing Roughness Hardness Solvent resistant

No. (mJ / cm ² ) (um) (m) (nm) (¾)

5 354 4.0 〇 <0.1 18 89 7Η 〇

6 538 6.5 〇 <0.1 18 88 7Η 〇

Example 3

In Example 1, No .:! To No. 4, the base sheet of the optically isotropic sheet (Γ) was coated on the surface (1) with a water-soluble quaternized ester and a urethane anchor coat. Example 1 was repeated except that a coating agent was applied and dried to provide an anchor coating layer having a thickness of 0.5 wm, and the resin liquid (2a) was brought into contact with the surface on the anchor coating layer side. However, almost the same results as in Example 1 were obtained.

Example 4

The resin liquid (2a) of Example 1 was cast on the surface of the base sheet (1) of the optically isotropic sheet (1) of Example 1, and the smoothed mold material (3) was added to the casting layer. Ultraviolet irradiation was performed while controlling the thickness of the sandwiching layer (2b) to 5.0 wm while pressing the smoothed glass having a surface roughness of 0.05 as the above), 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 not more than Q.lwm. Industrial applicability

The optical laminated sheet obtained by the method of the present invention is particularly important as an electrode substrate for manufacturing a liquid crystal display panel, but is also applicable to applications such as retardation plate members, polarizing plate members, optical disks, and optical cards. can do.

Claims

Scope of word blue

1. A laminated sheet in which an active energy ray-curable resin cured layer (2) is provided directly or via an anchor coating layer on a base sheet (1) having optical isotropy, Optical lamination with a surface roughness of free surface of the cured layer (2) of less than 0.5 win, a retardation value of the entire laminated sheet of 6 O nm or less, and a visible light transmittance of 60% or more. Sheet.

2. The resin of the active energy ray-curable resin composition is placed in the gap between the optically isotropic base sheet (1) with or without an anchor coating layer (1) and the smoothed mold material (3) with a smooth surface. The liquid (2a) is supplied so that the resin liquid (2a) is sandwiched between the two layers, and the sandwiched layer (2b) is cured by irradiating the active energy with the active energy to cure the resin. A method for producing a laminated sheet for optics, comprising forming a cured layer (2).