JP2000310717A - Transferring element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily transfer to a material to be transferred without lowering the characteristics of an optical element by constituting transferring element with at least a supporting substrate/protective layer/diffraction element layer and/adhesive layer 1/cholesteric liquid crystal layer/adhesive layer 2. SOLUTION: The element for transferring is constituted of at least a supporting substrate/protective layer diffraction element layer/adhesive layer 1/cholesteric liquid crystal layer/adhesive layer 2. As the supporting substrate, a plastic film, sheet or the like formed from a chain-type or alicyclic polyester such as a norbornene resin is cited. As the protective layer, the protective layer having ultraviolet absorbability and/or hard coatability can be used without specific restriction, and, as the diffraction element layer, a diffraction element layer having diffraction effect can be used without restriction. As the adhesive layers 1 and 2, conventionally known various reactive adhesives capable of being cured by heat, light or electron-beam or the like can be suitably used without specific restriction. As the cholesteric liquid crystal layer a cholesteric liquid crystal film, sheet or the like can be used without specific restriction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer element composed of a novel optical element capable of generating diffracted light having a polarization property.

[0002]

2. Description of the Related Art A diffractive element is a general-purpose optical element that is widely used in the field of spectral optics and the like for the purpose of splitting light and splitting a light beam. Diffraction elements are classified into several types based on their shape.Amplitude type diffraction elements, in which light-transmitting and non-light-transmitting parts are periodically arranged, are phase-type, in which periodic grooves are formed in a highly transparent material. It is usually classified as a diffraction element. Further, they may be classified as a transmission type diffraction element or a reflection type diffraction element according to the direction in which diffracted light is generated.

In the above-described conventional diffraction element, only non-polarized light can be obtained as diffracted light obtained when natural light (non-polarized light) is incident. Polarizing optical instruments such as ellipsometers, which are frequently used in the field of spectroscopy, can only obtain non-polarized light as diffracted light. In general, a method of using diffracted light through a polarizer in order to use only the polarized light component is used.
In this method, there is a problem that about 50% or more of the obtained diffracted light is absorbed by the polarizer, so that the amount of light is reduced by half. For that purpose, it is necessary to prepare a detector having a high sensitivity and a light source having a large amount of light, and the development of a diffraction element in which the diffracted light itself becomes a specific polarized light such as a circularly polarized light or a linearly polarized light has been required.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it has been found that an optical element comprising a diffraction element layer and a cholesteric liquid crystal layer functions as a polarization diffraction element. The inventors have invented a transfer element capable of easily transferring a transferred material.

[0005]

That is, the present invention relates to a transfer element comprising at least a support substrate / protective layer / diffraction element layer / adhesive layer 1 / cholesteric liquid crystal layer / adhesive layer 2.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The optical laminate of the present invention comprises a support substrate / protective layer / diffraction element layer / adhesive layer 1 / cholesteric liquid crystal layer / adhesive layer 2
At least. Here, the support substrate / protective layer / diffraction element layer / adhesive layer 1 / cholesteric liquid crystal layer / adhesive layer 2 means the support substrate, the protective layer, the diffraction element layer, the adhesive layer 1, the cholesteric liquid crystal layer, and the adhesive layer. 2 means a stacked configuration. An intermediate layer may be provided between the support substrate and the protective layer, and between the protective layer and the diffraction element layer. For example, an adhesive, a release layer, or the like may be used as the intermediate layer. Hereinafter, components of the present invention will be described in order.

[0007] The support substrate, which is a component of the present invention, functions as a support for the diffraction element layer. After the optical element composed of the diffraction element layer and the cholesteric liquid crystal layer is transferred to the transfer object, the support substrate is supported. The substrate is peeled off. As a supporting substrate having such a function, for example, polyimide,
Polyamide imide, polyamide, polyether imide,
Polyether ether ketone, polyether ketone, polyketone sulfide, polyether sulfone, polysulfone, polyphenylene sulfide, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyacetal, polycarbonate, polyarylate, acrylic resin, epoxy resin, phenol Examples include resins, polyvinyl alcohol, cellulose-based plastics, and plastic films and sheets formed from a chain or alicyclic polyolefin such as polyethylene, polypropylene, poly (4-methyl-1-pentene), norbornene-based resin, and the like. Can be As the support substrate, various alignment support substrates that can be used in forming a cholesteric liquid crystal film described later can be used as they are.

As the supporting substrate, a plastic film or sheet having a surface treated with silicon or the like, or an acrylic resin, a methacrylic resin, an epoxy resin, or a paraffin-based wax may be used as the supporting substrate. it can. Further, a plastic film or sheet serving as a support substrate that has been subjected to physical deformation treatment such as embossing, hydrophilic treatment, hydrophobic treatment, or the like may be used as a support substrate which is a component of the present invention. it can.

The thickness of the supporting substrate is usually 8 to 200 μm,
Preferably from 15 to 150 μm, more preferably from 20 to
100 μm. If the thickness is less than 8 μm, the handling properties of the obtained transfer element may be deteriorated. If the thickness is larger than 200 μm, the peeling transfer operation may not be performed smoothly. The support substrate is removed when the optical element composed of the diffraction element layer and the cholesteric liquid crystal layer is transferred to the object to be transferred, and the peeling interface is usually between the interface between the support substrate and the protective layer. It is.

The protective layer, which is a component of the present invention, has a purpose of protecting the diffraction element layer after the optical element composed of the diffraction element layer and the cholesteric liquid crystal layer has been transferred to an object to be transferred. The protective layer is not particularly limited as long as it has an ultraviolet absorbing property and / or a hard coat property. For example, a material in which a protective layer-forming material containing an ultraviolet absorber and a hard coat agent is formed into a film, a sheet, a thin film, or a plate. Further, a protective layer having an ultraviolet absorbing property made of a protective layer forming material containing an ultraviolet absorbent (hereinafter, referred to as an ultraviolet absorbing layer) and a protective layer having a hard coating property made of a protective layer forming material containing a hard coat agent (Hereinafter, a hard coat layer) may be used as the protective layer in the present invention. In addition, a laminate of a commercially available ultraviolet cut film and a hard coat film can be used as the protective layer. A laminate formed by applying various hard coat agents to the ultraviolet absorbing layer to form a film can also be used as the protective layer. Here, the ultraviolet absorbing layer and the hard coat layer
Each layer may be formed from two or more layers, and each layer can be laminated via an adhesive layer or the like.

The ultraviolet absorber is not particularly limited as long as it is compatible or dispersible in the protective layer forming material. For example, a benzophenone compound, a salicylate compound,
Organic ultraviolet absorbers such as benzotriazole-based compounds, oxalic anilide-based compounds, and cyanoacrylate-based compounds, and inorganic ultraviolet absorbers such as cesium oxide, titanium oxide, and zinc oxide can be used. Among them, a benzophenone-based compound having high ultraviolet absorption efficiency is preferably used. In addition, one or more ultraviolet absorbers can be added. The blending ratio of the ultraviolet absorber in the protective layer varies depending on the material for forming the protective layer to be used.
It is 1 to 20% by weight, preferably 0.5 to 10% by weight.

The hard coat agent is not particularly limited as long as it is compatible or dispersible in the protective layer forming material. For example, organopolysiloxane type, photocurable resin type acrylic oligomer type, urethane acrylate type, epoxy Acrylate, polyester acrylate,
An acrylic-silicon-based thermosetting resin-based or inorganic compound such as ceramics can be used. Above all, an organopolysiloxane-based or photo-curable resin-based acrylic oligomer-based hard coat agent is preferably used from the viewpoint of film-forming properties and the like. These hard coat agents can be used either in a solventless type or a solvent type.

The material for forming the protective layer includes, in addition to an ultraviolet absorber and a hard coat agent, if necessary, a light stabilizer such as a hindered amine or a quencher, an antistatic agent, a slipperiness improver, a dye, a pigment, a surfactant. Various additives such as fillers such as fine silica and zirconia can also be blended. The mixing ratio of these various additives is not particularly limited as long as the effects of the present invention are not impaired, but is usually 0.01 to 10% by weight, preferably 0.05 to 5% by weight.

Further, the ultraviolet absorbing layer constituting the protective layer can be formed using a material obtained by appropriately blending an ultraviolet absorbing agent and, if necessary, a light stabilizer and the like into the protective layer forming material described above. Further, a commercially available ultraviolet cut film or the like can be used as the ultraviolet absorbing layer in the present invention.

The hard coat layer constituting the protective layer is
The protective layer can be formed by using a material in which a hard coat agent and various additives are added to the protective layer forming material described above. The hard coat layer may be formed by applying the above hard coat agent on a transparent support film. As a transparent support film, polymethyl methacrylate, polystyrene, polycarbonate,
Examples include films formed from polyether sulfone, polyphenylene sulfide, amorphous polyolefin, triacetyl cellulose, polyethylene terephthalate, polyethylene naphthalate, and the like.

The ultraviolet absorbing layer and the hard coat layer are laminated via an adhesive or the like, and can be used as the protective layer in the present invention. As the adhesive, a heat, light or electron beam-curable reactive adhesive described later can be used. The protective layer can also be formed by using an adhesive containing an ultraviolet absorbent and laminating a separately prepared hard coat layer on the cholesteric liquid crystal layer. Further, a dye, a pigment, a surfactant and the like may be appropriately added to the adhesive as needed.

Further, as the hard coat layer, a vehicle resin for gravure ink or the like can be suitably used.
Examples of the gravure ink vehicle resin include nitrocellulose, ethylcellulose, polyamide resin, vinyl chloride, chlorinated polyolefin, acrylic resin, polyurethane, and polyester. In addition, hard resins such as ester gum, dammar gum, maleic resin, alkyd resin, phenol resin, ketone resin, xylene resin, terpene resin, petroleum resin, etc. are used in the gravure ink vehicle resin in order to improve adhesion and film strength. May be blended.

The structure of the hard coat layer can be a single hard coat layer or a composite layer according to the required weather resistance and the like. As the composite layer, for example, a hard coat layer containing an organopolysiloxane, a hard coat layer containing a photocurable resin, a hard coat layer containing a thermosetting resin,
A composite layer composed of two or more layers, such as a hard coat layer containing an inorganic compound, may be used as the hard coat layer.

Further, the degree of the hard coat property, that is, the hardness, cannot be unconditionally determined by the material constituting the transfer element of the present invention. However, when the evaluation is performed according to the test method described in JIS L0849, the determination of discoloration is made. It is desirable that the standard is at least 3 or more, preferably 4 or more.

The protective layer, which is a component of the present invention, and the ultraviolet absorbing layer and the hard coat layer constituting the protective layer are generally formed by a roll coating method, a dipping method, a gravure coating method, a bar code method, a spin coating method, or the like. Known methods such as a method, a spray coating method, and a printing method can be employed. After forming a film on the cholesteric liquid crystal layer or the support film by these methods, the protective layer can be formed by performing post-processing according to the protective layer forming material used. Examples of a method for forming a protective layer composed of a composite layer of an ultraviolet absorbing layer and a hard coat layer include, for example, a method in which a hard coating agent is applied directly to the ultraviolet absorbing layer, a method in which the ultraviolet absorbing layer is laminated via an adhesive, and the like. .

The thickness of the protective layer cannot be specified unconditionally because it differs depending on the performance required for the ultraviolet absorbing property and the hard coating property, but it is usually 0.1 to 100 μm, preferably 1 to 50 μm. Also, when the protective layer is formed of a composite layer with an ultraviolet absorbing layer and a hard coat layer, the total thickness of each layer is preferably within the above range.

The diffractive element layer which is a component of the present invention is not particularly limited as long as it has a diffraction effect by providing a difference in transmittance, thickness, refractive index and the like. For example, a relief hologram having unevenness on the surface or a volume phase hologram having a refractive index difference inside can be suitably used. In addition, for example, a commercially available Commer manufactured by Edmund Scientific Inc.
Cial Grade ruled line diffraction grating, transmission type diffraction grating film, Ruled Gr manufactured by JOBIN YVON
Ating and the like can also be used.

Examples of the material for forming the relief hologram include thermoplastic resins such as vinyl chloride, polyester, acrylic resin and cellulose resin, and photo-curable resins such as acrylic. The relief hologram may be provided with a thin aluminum film by vapor deposition or the like in order to improve the appearance of the diffraction image. Such a relief hologram can also be used as a diffraction element layer.

The material for forming the volume phase hologram is not particularly limited. For example, a silver salt film, gelatin dichromate, a photosensitive resin and the like can be used.

The thickness of the diffraction element layer is usually 0.3 to 20 μm.
m, preferably 0.5 to 10 μm, more preferably 0.7 to 3 μm. When the ratio is out of this range, there is a possibility that a unique optical characteristic effect in a laminate including a diffraction element layer and a cholesteric liquid crystal layer described later cannot be effectively exhibited.

The adhesive layer 1, which is a component of the present invention, is not particularly limited, and various kinds of conventionally known heat, light or electron beam curing type reactive adhesives can be used as appropriate. . Among them, a light or electron beam curing type reactive adhesive is preferably used. As a reactive adhesive,
Prepolymers and / or monomers having photo- or electron beam polymerizability, if necessary, blended with other monofunctional or polyfunctional monomers, various polymers, stabilizers, photopolymerization initiators, sensitizers, etc. Can be.

Specific examples of the prepolymer having photo- or electron-beam polymerizability include polyester acrylate, polyester methacrylate, polyurethane acrylate, polyurethane methacrylate, epoxy acrylate, epoxy methacrylate, polyol acrylate, polyol methacrylate and the like. . Examples of the monomer having photo- or electron beam polymerizability include monofunctional acrylate, monofunctional methacrylate, difunctional acrylate, difunctional methacrylate, trifunctional or higher polyfunctional acrylate, and polyfunctional methacrylate. These can also use a commercial item, for example, Aronix (acrylic special monomer, oligomer;
Toagosei Co., Ltd.), Light Ester (Kyoeisha Chemical Co., Ltd.), Biscoat (Osaka Organic Chemical Industry Co., Ltd.)
Etc. can also be used in the present invention.

As the photopolymerization initiator, for example, benzophenone derivatives, acetophenone derivatives, benzoin derivatives, thioxanthones, Michler's ketone, benzyl derivatives, triazine derivatives, acylphosphine oxides, azo compounds and the like can be used. .

The viscosity of the light- or electron-beam-curable reactive adhesive that can be used in the present invention is appropriately selected depending on the processing temperature of the adhesive and cannot be unconditionally determined. ~ 2000 mPa · s, preferably 50
１０００1000 mPa · s, more preferably 100 to 50
0 mPa · s. When the viscosity is lower than 10 mPa · s, it is difficult to obtain a desired thickness. 2000mPa
-If it is higher than s, workability may decrease, which is not desirable. If the viscosity is out of the above range,
It is preferable to adjust the solvent and the proportion of the monomer appropriately to obtain a desired viscosity.

When a photo-curing reactive adhesive is used, a known curing method such as a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide lamp, a xenon lamp, or the like is used as a method for curing the adhesive. be able to. Although the exposure amount cannot be determined unconditionally because it differs depending on the type of the reactive adhesive used, it is usually 50 to 2000 mJ.
/ Cm ² , preferably 100 to 1000 mJ / cm ² .

When an electron beam-curable reactive adhesive is used, the method of curing the adhesive is appropriately selected depending on the penetrating power and the curing power of the electron beam, and cannot be determined unconditionally. Usually, curing can be carried out by irradiating under an acceleration voltage of 50 to 1000 kV, preferably 100 to 500 kV.

Although the thickness of the adhesive layer 1 cannot be unconditionally determined because it varies depending on the intended use and its workability, it is usually 0.5 to 50 μm, preferably 1 to 10 μm. The method for forming the adhesive layer 1 varies depending on the method for manufacturing the transfer element of the present invention described later. For example, a roll coating method, a die coating method, a bar coating method, a curtain coating method, an extrusion coating method, a gravure roll coating method It can be formed on a cholesteric liquid crystal layer or a diffractive element layer using a known method such as a spray coating method, a spin coating method, or the like.

The cholesteric liquid crystal layer as a component of the present invention is not particularly limited as long as it is a cholesteric liquid crystal film, sheet, or plate having a fixed cholesteric orientation. Further, the cholesteric liquid crystal film can be formed from a film material mainly composed of a polymer liquid crystal, a low molecular liquid crystal, or a mixture thereof.

The polymer liquid crystal is not particularly limited as long as the cholesteric alignment can be fixed.
Any of a side chain type polymer liquid crystal and the like can be used.
Specific examples include main-chain liquid crystal polymers such as polyester, polyamide, polycarbonate, and polyesterimide, and side-chain liquid crystal polymers such as polyacrylate, polymethacrylate, polymalonate, and polysiloxane. Among them, a liquid crystalline polyester which has good orientation in forming cholesteric orientation and is relatively easy to synthesize is desirable. As the structural unit of the polymer,
For example, aromatic or aliphatic diol units, aromatic or aliphatic dicarboxylic acid units, and aromatic or aliphatic hydroxycarboxylic acid units are preferred examples.

Examples of the low-molecular liquid crystal include those having a basic skeleton of a biphenyl derivative, a phenylbenzoate derivative, a stilbene derivative or the like into which a functional group such as an acryloyl group, a vinyl group or an epoxy group is introduced. As the low-molecular liquid crystal, both lyotropic properties and thermotropic properties can be used, but those exhibiting thermotropic properties are more preferable from the viewpoint of workability, process and the like.

A method for fixing the cholesteric alignment is a known method. For example, when a polymer liquid crystal is used as a film material, after a polymer liquid crystal is disposed on an alignment substrate, a cholesteric liquid crystal phase is developed by heat treatment or the like. A method of fixing the cholesteric orientation by quenching from that state can be used. When a low-molecular liquid crystal is used as a film material, after the low-molecular liquid crystal is disposed on the alignment substrate, a cholesteric liquid crystal phase is developed by heat treatment or the like, and cross-linked by light, heat or an electron beam while maintaining that state. Then, a method of fixing the cholesteric orientation and the like can be appropriately adopted. The alignment substrate is not particularly limited as long as it does not hinder cholesteric alignment, and examples thereof include a glass substrate or a plastic substrate such as a plastic film or a plastic sheet. Examples of the glass substrate include soda glass, silica-coated soda glass, and borosilicate glass substrate. Examples of the plastic substrate include polymethyl methacrylate, polystyrene, polycarbonate, polyether sulfone, polyphenylene sulfide, amorphous polyolefin, triacetyl cellulose, polyethylene terephthalate, and polyethylene naphthalate substrates. A uniaxial or biaxial stretching operation can be appropriately applied to these oriented substrates as needed. Furthermore, as an alignment substrate,
The diffraction element layer which is a component of the present invention can be used as an alignment substrate.

In order to improve the heat resistance and the like of the cholesteric liquid crystal layer, a crosslinking agent such as a bisazide compound or glycidyl methacrylate may be added to the film material in addition to the polymer liquid crystal and the low molecular liquid crystal. Crosslinking can be performed in a state where a cholesteric phase is developed by adding an agent. Further, various additives such as dichroic dyes, dyes, and pigments can be appropriately added to the film material.

The structure of the cholesteric liquid crystal layer, which is a component of the present invention, usually comprises one layer of a cholesteric liquid crystal film in which cholesteric orientation is fixed. Further, a configuration in which a plurality of cholesteric liquid crystal films are laminated according to the application and required optical characteristics may be employed.

The thickness of the cholesteric liquid crystal layer is usually 0.1.
It is 3 to 20 μm, preferably 0.5 to 10 μm, and more preferably 0.7 to 3 μm. If it is out of this range, there is a possibility that a unique optical characteristic effect in the laminate of the diffraction element layer and the cholesteric liquid crystal layer may not be exhibited. When the cholesteric liquid crystal film is composed of a plurality of layers, the total thickness of all the films is preferably in the above range.

The adhesive layer 2, which is a component of the present invention, is formed for the purpose of bonding between the transferred object and the cholesteric liquid crystal layer. The adhesive layer 2 is not particularly limited, and various conventionally known adhesives and adhesives,
Specifically, a hot-melt adhesive, a light or electron beam-curable reactive adhesive described in the adhesive layer 1 as a component of the present invention, or the like can be appropriately used. Among them, a hot-melt adhesive is preferably used in the present invention from the viewpoint of workability during transfer.

The hot-melt type adhesive is not particularly limited, but the operating temperature of the hot-melt is 250 ° C. or lower, preferably 80 to 200 ° C., more preferably 100 to 16 ° C.
Those having a temperature of about 0 ° C. are desirably used from the viewpoint of workability and the like. Specifically, for example, polyvinyl acetal resins such as ethylene-vinyl acetate copolymer resins, polyester resins, polyurethane resins, polyamide resins, thermoplastic rubbers, polyacrylic resins, polyvinyl alcohol resins, and polyvinyl butyral A hot melt adhesive having a base resin of petroleum resin, terpene resin, rosin resin or the like can be used.

The thickness of the adhesive layer 2 varies depending on the intended use and its workability, and cannot be unconditionally determined, but is usually 0.5 to 50 μm, preferably 1 to 10 μm. The method for forming the adhesive layer 2 varies depending on the method for manufacturing the transfer element of the present invention described later. For example, a roll coating method, a die coating method, a bar coating method, a curtain coating method, an extrusion coating method, a gravure roll coating method It can be formed on a cholesteric liquid crystal layer using a known method such as a spray coating method, a spin coating method and the like.

An intermediate layer may be provided between the support substrate and the protective layer constituting the transfer element of the present invention, and between the protective layer and the diffraction element layer. Examples of the intermediate layer include an adhesive layer and a release layer.

The adhesive layer is not particularly limited, but, for example, the above-described light or electron beam-curable reactive adhesive can be appropriately used. The release layer can be formed of, for example, wax, silicone, a fluorine-based release agent, or the like, which exhibits fluidity by heat. In addition, between the support substrate and the protective layer that constitute the transfer element of the present invention, two layers, that is, an adhesive layer and a release layer may be used as an intermediate layer.

The method for producing the transfer element of the present invention includes:
(1) Laminate sequentially on a support substrate to have the configuration of the present invention. (2) Press, heat, and cure the remaining laminate separately manufactured on a support substrate having an adhesive layer formed on the surface in advance. (3)
On the supporting substrate, the remaining laminated body separately prepared is prepared on a peelable substrate, and the peeling substrate is removed by transferring the pressure, heating, curing, etc. to the supporting substrate side alone or in combination. Method and the like.

Here, the releasable substrate is not particularly limited as long as it is a substrate having releasability and self-supporting property, and a plastic film having releasability is preferably used as the substrate. The term “peelability” as used herein means that, in a state where the cholesteric liquid crystal film layer and the peelable substrate are bonded via the adhesive, the film can be peeled at the interface between the adhesive and the peelable substrate. As such a peelable substrate, specifically, polyethylene, polypropylene,
Olefinic resins such as 4-methylpentene-1 resin, polyamide, polyimide, polyamideimide, polyetherimide, polyetherimide, polyetherketone,
Polyether ether ketone, polyether sulfone, polyketone sulfide, polysulfone, polystyrene, polyphenylene sulfide, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polyacetal,
Examples thereof include polycarbonate, polyvinyl alcohol, and cellulosic plastic. These plastic films may be used on their own, or on these plastic film surfaces,
Those coated with silicone or fluorine resin, those formed with an organic thin film or inorganic thin film, those subjected to a chemical treatment, and those subjected to a physical treatment such as vapor deposition or surface polishing can also be used.

The adhesive used for transferring the cholesteric liquid crystal layer to the peelable substrate is not particularly limited, but is preferably a heat, light or electron beam-curable reactive as described above. An adhesive or the like can be used as appropriate.

Further, examples of the peeling and removing method in the above manufacturing method include a method of applying an adhesive tape to a corner end of an oriented substrate or a peelable substrate and artificially peeling, and a method of mechanically peeling using a roll or the like. , A method of mechanically peeling after immersion in a poor solvent for all structural materials, a method of peeling by applying ultrasonic waves in a poor solvent, the difference in thermal expansion coefficient between the alignment substrate or the peelable substrate and the cholesteric liquid crystal layer For example, a method in which the film is peeled off by giving a change in temperature can be appropriately used. The above manufacturing method is merely an example, and the transfer element of the present invention is not limited thereto.

The transfer element of the present invention depends on the type of the adhesive layer constituting the element, but may be, for example, polyimide, polyamide imide, polyamide, polyether imide, polyether ether ketone, polyether ketone, polyketone sulfide. , Polyether sulfone, polysulfone, polyphenylene sulfide, polyphenylene oxide, polyvinyl chloride, polystyrene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyvinyl alcohol, polyacetal, polyarylate, cellulose-based plastic Sheet, film or various molded products of paper, epoxy resin, phenolic resin, etc., paper such as paper and synthetic paper, metal It can be transferred from the supporting substrate for various transfer target such as glass. When a hot-melt type adhesive is used as an adhesive which is a component of the present invention, when a so-called hot stamping device capable of instantaneously applying heat, pressure and impact is used, transfer and peeling are performed. , A series of removal operations can be performed simultaneously and instantaneously.

The transfer element of the present invention transfers an optical element composed of a cholesteric liquid crystal layer and a diffractive element layer, which has a unique effect that a diffracted light has a circular polarization property, which is not possible with a conventional optical member, to an object to be transferred. The transferred optical element has a very wide application range as a new diffraction function element, and can be used as various optical elements, optoelectronic elements, decorative members, forgery prevention elements, and the like. .

Specifically, as an optical element or an optoelectronic element, for example, a transparent and isotropic film as a support substrate, for example, Fujitac (Fuji Photo Film Co., Ltd.)
Triacetylcellulose film such as Konica Catac (Konica Corporation), TPX film (Mitsui Chemicals Co., Ltd.), Arton film (Nippon Synthetic Rubber Co., Ltd.)
ZEONEX Film (Zeon Corporation),
An optical element comprising a cholesteric liquid crystal layer and a diffractive element layer is transferred to an acrylene film (manufactured by Mitsubishi Rayon Co., Ltd.) using the transfer element of the present invention, and an optical laminate is obtained to obtain various optical applications. It is possible to develop. For example, the optical laminated body is formed by TN (twiste).
d nematic) -LCD (Liquid Cry)
Stall Display), STN (Super T)
wisted Nematic) -LCD, ECB (E
Electrically Controlled Bi
(refringence) -LCD, OMI (Opti)
cal Mode Interference) -LC
D, OCB (Optically Compensat
ed Birefringence)-LCD, HAN
(Hybrid Aligned Nematic)-
LCD, IPS (In Plane Switchin)
g) Various LCDs having improved color compensation and / or improved viewing angle can be obtained by providing the liquid crystal display such as an LCD. Further, the optical laminate can be used as a spectroscopic optical device that requires polarized light separated as described above, a polarizing optical element that obtains a specific wavelength by a diffraction phenomenon, an optical filter, a circularly polarizing plate, a light diffusing plate, and the like. In addition, it is possible to provide various optical members that can exhibit an optical effect that has not existed conventionally as an optical element or an optoelectronic element, such as obtaining a linear polarizing plate by combining with a quarter-wave plate. .

As a decorative member, as a new member having both a rainbow color effect by diffractive power and a vivid color effect by cholesteric liquid crystal, various products and the like include a cholesteric liquid crystal layer and a diffraction element layer. Can be transferred. In addition, since the optical element can be easily transferred, it can be expected to greatly contribute to differentiation from other similar products by a method of attaching the optical element to an existing product or the like, or integrating it. For example, when an optical element consisting of a cholesteric liquid crystal layer incorporating a designable diffraction pattern and a diffraction element layer is transferred to a glass window or the like, a cholesteric liquid crystal with a diffraction pattern caused by the diffraction element layer is viewed from the outside by its viewing angle. The unique selective reflection looks different colors, and is excellent in fashionability. In addition, it is possible to provide a window in which the inside is hardly seen from the bright outside, and the outside is excellent in the interior from the inside.

The anti-counterfeit element can be used as a new anti-counterfeit film, seal, label or the like having both the anti-counterfeit effect of the diffraction element and the cholesteric liquid crystal. Specifically, using the transfer element of the present invention, for example, a car driver's license, identification card, passport, credit card, prepaid card, various cash vouchers,
By transferring an optical element comprising a cholesteric liquid crystal layer and a diffractive element layer onto a gift card, a card substrate of securities, a mount, or the like, the optical element is integrated with or partially provided on the card substrate, the mount, or the like. It can be pasted, embedded, or woven into paper. Further, the optical element constituting the transfer element of the present invention has an anti-counterfeiting effect due to the viewing angle characteristics of the diffraction element layer and the wavelength-selective reflectivity of the cholesteric liquid crystal layer, the circularly-polarized light selective reflectivity, the viewing angle dependency of color, and the beautiful cholesteric color. It also has the effect of preventing forgery by color. Therefore, it is very difficult to forge an optical element comprising the cholesteric liquid crystal layer and the diffractive element layer which constitute the transfer element of the present invention.

These applications are only examples, and the transfer element of the present invention can be used in various applications where a single diffraction element or a single cholesteric liquid crystal film has been used, or can exhibit a new optical effect. Since it is possible to various applications other than the above-mentioned applications, it is possible to easily transfer an optical element comprising a cholesteric liquid crystal layer and a diffractive element layer expressing its unique optical effect to an object to be transferred.
Application development is possible in various applications.

[0055]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

Reference Example 1: Synthesis of low-molecular liquid crystal having acryloyl group Distilled and purified tetrahydrofuran 180
g, 151.3 g (518 mmol) of 4- (6-acryloyloxyhexyloxy) benzoic acid and 1.5 g of 2,6-ditert-butyl-4-methylphenol were dissolved in 70.1 g of diisopropylethylamine.
(543 mmol) was added dropwise with stirring to a solution of 62.1 g (543 mmol) of methanesulfonyl chloride in tetrahydrofuran, which was cooled to -10 ° C. After completion of the dropwise addition, the reaction solution was heated to 0 ° C. and further stirred, and then 29.87 g of methylhydroquinone (24
(6 mmol) in tetrahydrofuran was added dropwise. The reaction solution was further stirred, and 4-dimethylaminopyridine was added.
0 g (25 mmol) of triethylamine 62.4 g
(617 mmol) was added dropwise. After the dropwise addition, the reaction solution was stirred at 0 ° C. for 1 hour, and then heated to room temperature and stirred for 5 hours. After completion of the reaction, the reaction solution was diluted with 1000 ml of ethyl acetate, transferred to a separating funnel, and separated with 1N hydrochloric acid. The organic layer was further diluted with 1N hydrochloric acid, a saturated aqueous solution of sodium hydrogencarbonate, and a saturated aqueous solution of magnesium sulfate. Washed. 100 g of anhydrous magnesium sulfate was added to the organic layer, and the mixture was stirred at room temperature for 1 hour, dehydrated and dried. The magnesium sulfate was separated by filtration, and concentrated by a rotary evaporator to obtain methylhydroquinone-bis (4- (6-acryloyloxy). Hexyloxy) benzoic acid ester was obtained as a crude product. The crude product was recrystallized from ethyl acetate / methanol to obtain 146.9 g of methylhydroquinone-bis (4- (6-acryloyloxyhexyloxy) benzoic acid) ester as white crystals (yield 85. 2%). The purity of compound I-1 by GPC was 9
It was 8.7%. GPC uses tetrahydrofuran as an elution solvent, and is a packed column for high-speed GPC (TSKge).
l GPC analyzer CCP & 8000 (CP-8000, CO-80) manufactured by Tosoh equipped with G-1000HXL
00, UV-8000). Observation of the obtained methylhydroquinone-bis (4- (6-acryloyloxyhexyloxy) benzoic acid) ester on a METTLER hot stage under a polarizing microscope showed that at room temperature, the crystal phase was 85%.
The temperature changes to a nematic phase around ℃,
It became an isotropic phase around 5 ° C.

Reference Example 2 Using the same method as in Reference Example 1, 34- (6-acryloyloxyhexyloxy) benzoic acid was obtained from 32.5 g (111 mmol) and 12.6 g (106 mmol) of 4-cyanophenol in 34 parts. .8 g of 4
-Cyanophenol-4- (6-acryloyloxyhexyloxy) benzoate (yield 84%) was obtained.
The purity of 4-cyanophenol-4- (6-acryloyloxyhexyloxy) benzoate by GPC was 99.3%.

Reference Example 3: Synthesis of polymer liquid crystal 49 mmol of terephthalic acid, 24 mmol of methylhydroquinone,
Catechol 25 mmol, (R) -2-methyl-1,4
Polycondensation was carried out using 1.7 mmol of butanediol and 100 mg of sodium acetate in a nitrogen atmosphere at 180 ° C. for 1 hour, 200 ° C. for 1 hour, and 250 ° C. for 1 hour in a stepwise manner. Then while flowing nitrogen 2
The polycondensation was continued at 50 ° C. for 2 hours,
Time polycondensation was performed. After dissolving the obtained polymer in tetrachloroethane, reprecipitation was performed with methanol to obtain a purified polymer (aromatic polyester). The logarithmic viscosity of the obtained polymer was 0.150, and the glass transition point was 90 ° C.

The analytical methods of the obtained polymer are as follows. (1) Logarithmic viscosity of polymer Using a Ubbelohde viscometer, phenol / tetrachloroethane = 60/40 (weight ratio), a concentration of 0.5 g /
The measurement was performed at 100 ° C. and 30 ° C. (2) Glass transition point (Tg) Measured using a Du Pont 990 Thermal Analyzer. (3) Identification of Liquid Crystal Phase Observed using a BH2 polarizing microscope manufactured by Olympus Optical Co., Ltd.

Example 1 7.0 g of methylhydroquinone-bis (4- (6-acryloyloxyhexyloxy) benzoic acid) ester obtained in Reference Example 1 and 4-cyanophenol obtained in Reference Example 2 1.07 g of -4- (6-acryloyloxyhexyloxy) benzoic acid ester and chiral dopant liquid crystal S-811 (Rodick) 1.
93 g, fluorinated surfactant S-383 (Asahi Glass Co., Ltd.)
And irgacure 907 (trade name of Ciba-Geigy), which is a photopolymerization initiator, in an amount of 3% by weight based on the acryloyl group-binding compound, and a 10% by weight solution of N-methyl-2-pyrrolidone. did. This N-methyl-
Rubbing 2-pyrrolidone solution to a 75 μm thick polyethylene terephthalate film (manufactured by Toray Industries, Inc.)
Was applied, the solvent was dried, and heat treatment was performed at 80 ° C. to align the liquid crystal molecules. Then, the film was irradiated with ultraviolet rays at room temperature to obtain a film on a polyethylene terephthalate film.

The transmission spectrum of the obtained film was evaluated using a spectroscope V-500 (manufactured by JASCO Corporation).
A reduced region of transmitted light due to selective reflection was observed around 780 nm near the infrared region, and it was confirmed that this film was a cholesteric liquid crystal film showing selective reflection of red light.

A diffractive film composed of a volume phase hologram having a thickness of 10 μm produced by using an acrylic photopolymer is irradiated with an ultraviolet-curable adhesive (Aronix UV-3630 (trade name) manufactured by Toagosei Co., Ltd.) as described above. The obtained cholesteric liquid crystalline film was transferred (diffraction film / adhesive layer / cholesteric liquid crystalline film / polyethylene terephthalate film).

Next, 20.0% by weight of Aronix M-240 (trade name, manufactured by Toagosei Co., Ltd.), which is a photo-curable acrylic oligomer, and M-320 (trade name, manufactured by Toagosei Co., Ltd.) 10.0% by weight and a benzophenone-based ultraviolet absorber (Seepro 106 manufactured by Cipro Kasei)
5% by weight of each was transferred to a polyphenylene sulfide film via an ultraviolet-curable adhesive (Aronix UV-3630 manufactured by Toagosei Co., Ltd.), and the polyethylene terephthalate film used as an alignment substrate of the cholesteric liquid crystal film was peeled off. Removed.

A hot melt adhesive layer was formed on the cholesteric liquid crystal film from which the polyethylene terephthalate film had been removed, and a transfer element (polyphenylene sulfide film / protective layer made of adhesive / diffraction film /
(Cholesteric liquid crystalline film / hot melt type adhesive layer). The obtained transfer element was transferred onto a 10 cm square, 1 mm thick plastic sheet made of polyvinyl chloride at 140 ° C. using a hot stamping device.

As a result, it was possible to transfer an approximately 1 cm square optical element comprising a diffraction film having a protective layer and a cholesteric liquid crystal film at the right corner of the polyvinyl chloride sheet. The polyphenylene sulfide film, which is a support substrate of the transfer element, was peeled off at the interface with the diffraction film during hot stamping. Further, the hot melt adhesive layer was firmly bonded to the polyvinyl chloride sheet. After the transfer, when light was applied to the optical element composed of the diffraction film having the protective layer and the cholesteric liquid crystal film, bright selective reflection light and diffraction light were observed.

(Embodiment 2) Rubbed 75 μm thick
m polyphenylene sulfide film (Toray Industries, Inc.)
2) of the aromatic polyester obtained in Reference Example 3
A 0% by weight N-methyl-2-pyrrolidone solution was applied by a spin coating method, dried, and heat-treated at 200 ° C. for 5 minutes to obtain a film exhibiting a golden selective reflection. When the reflected light of the film was measured, it was confirmed that the film was a cholesteric liquid crystal film having a center wavelength of about 600 nm and a selective reflection wavelength bandwidth of 100 nm.

A 10 μm-thick volume phase hologram produced by using an acrylic photopolymer was diffracted by a UV-curable adhesive (Aronix UV-3630 (trade name) manufactured by Toagosei Co., Ltd.) through a UV-curable adhesive. The obtained cholesteric liquid crystalline film was transferred (diffraction film / adhesive layer / cholesteric liquid crystalline film / polyphenylene sulfide film).

Next, 20.0% by weight of Aronix M-240 (trade name, manufactured by Toagosei Co., Ltd.) and M-320, which are photo-curable acrylic oligomers, were placed on the diffraction film.
(Trade name, manufactured by Toagosei Co., Ltd.) Transferred to a polyethylene terephthalate film via an ultraviolet-curable adhesive (Aronix UV-3630, manufactured by Toagosei Co., Ltd.) to which 10.0% by weight was added, respectively, to obtain a cholesteric liquid crystal The polyphenylene sulfide film used as the film orientation substrate was peeled off.

A hot melt adhesive layer was formed on the cholesteric liquid crystal film from which the polyphenylene sulfide film had been removed, and a transfer element (polyethylene terephthalate film / protective layer composed of adhesive / diffraction film /
(Cholesteric liquid crystalline film / hot melt type adhesive layer). The obtained transfer element was transferred onto a 10 cm square, 1 mm thick plastic sheet made of polyvinyl chloride at 140 ° C. using a hot stamping device.

As a result, it was possible to transfer an optical element composed of a diffraction film having a protective layer and a cholesteric liquid crystal film having a protective layer of about 1 cm square at the right corner of the polyvinyl chloride sheet. Note that the polyethylene terephthalate film, which is a support substrate of the transfer element, was peeled off at the interface with the diffraction film during hot stamping. Further, the hot melt adhesive layer was firmly bonded to the polyvinyl chloride sheet. After the transfer, when light was applied to the optical element composed of the diffraction film having the protective layer and the cholesteric liquid crystal film, bright selective reflection light and diffraction light were observed.

Further, when an attempt was made to transfer an optical element onto A4 size paper using a transfer element, the cholesteric liquid crystal layer was found to have alignment disorder or misalignment as in the case of using a polyvinyl chloride sheet as an object to be transferred. Cracks, etc.
Transfer could be carried out without cracks or the like also occurring in the protective layer. Further, in the optical element composed of the diffraction film having the transferred protective layer and the cholesteric liquid crystalline film, bright selective reflection light and diffraction light were observed.

Example 3 In the same manner as in Example 2, a cholesteric film exhibiting a gold selective reflection was obtained on a rubbed polyphenylene sulfide film. An ultraviolet-curable adhesive (Aronix UV-3630 manufactured by Toagosei Co., Ltd.) is applied to a diffraction film composed of a volume phase hologram having a thickness of 10 μm manufactured using an acrylic photopolymer.
(Trade name)), the cholesteric liquid crystalline film obtained above was transferred (diffraction film / adhesive layer / cholesteric liquid crystalline film / polyphenylene sulfide film).

Next, 20.0% by weight of Aronix M-240 (trade name, manufactured by Toagosei Co., Ltd.) and M-320 (trade name, manufactured by Toagosei Co., Ltd.), which are photo-curable acrylic oligomers, are placed on the diffraction film. 10.0% by weight and a benzophenone-based ultraviolet absorber (Seepro 106 manufactured by Cipro Kasei)
5% by weight of each was transferred to a polyethylene terephthalate film via an ultraviolet-curable adhesive (Aronix UV-3630 manufactured by Toagosei Co., Ltd.), and the polyphenylene sulfide film used as the alignment substrate of the cholesteric liquid crystal film was peeled off. Removed.

An adhesive layer made of an acrylic resin is formed on the cholesteric liquid crystal film from which the polyphenylene sulfide film has been removed, and a transfer element (polyethylene terephthalate film / protective layer made of adhesive / diffraction film / cholesteric liquid crystal film / adhesive) Layer). The obtained transfer element was cut into a size of 1 cm square and bonded to a glass plate via an adhesive layer. Next, a cellophane tape was adhered to a polyethylene terephthalate film as a support substrate of the transfer element, and the polyethylene terephthalate film was peeled off.

When light was applied to an optical element comprising a diffraction film having a protective layer after transfer and a cholesteric liquid crystal film, diffracted light was observed simultaneously with the selectively reflected light.
Further, it was confirmed that the optical element could be transferred to a polyvinyl chloride sheet or paper in the same manner using the obtained transfer element.

[0076]

According to the present invention, an optical element comprising a cholesteric liquid crystal layer and a diffractive element layer having unique optical characteristics, such as diffracted light having circularly polarized light, which is not present in conventional optical elements, is used as a component. The optical element has a very wide range of application as a new diffraction function element, and is useful as, for example, an optical element, an optoelectronic element, a decoration material, a forgery prevention element, and the like. Further, the transfer element of the present invention can be easily transferred to an object to be transferred without deteriorating the characteristics of the optical element exhibiting unique optical characteristics, and has excellent workability. The transferred optical element is also excellent in various resistances including weather resistance. For this reason, the transfer element of the present invention has an extremely high industrial value, for example, it can impart unique optical characteristics to various materials.

Claims (1)

[Claims] 1. A transfer element comprising at least a support substrate / protective layer / diffraction element layer / adhesive layer 1 / cholesteric liquid crystal layer / adhesive layer 2.