JPH03284786A - Hologram reproducing mold and production thereof and production of hologram - Google Patents

Abstract

PURPOSE:To shorten the process for production and to obtain holograms having stable quality in large quantity by forming relief patterns on the surface of a resin layer consisting of a specified mixture to produce the reproducing mold, pressing the reproducing mold onto the thermoplastic resin of a base material in pressure contact therewith, then detaching the mold. CONSTITUTION:The rein layer 2 consisting of an acrylate resin which can be cured by electron rays or UV rays or a mixture composed of a monomer and acrylate or methacrylate contg. an isocyanurate ring structure in the molecules is formed on a film or sheet-like base 1 having the transmittability of the electron rays or UV rays and thereafter, the resin layer 2 is brought into tight contact with the surface of a hologram original plate A having fine relief patterns on the surface and is irradiated with the electron rays or UV rays by which the resin layer is cured; thereafter, the resin layer is peeled and the hologram reproducing mold B is obtd. The hologram reproducing mold B is heated and is brought into pressurized contact with the surface of the thermoplastic resin layer 5 on the base material 6 and thereafter, the hologram reproducing mold B is detached, by which the hologram reproducing product C is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to the production of holograms, and more particularly to a replication mold for producing relief-type holograms, a method for producing the same, and an effective method for producing holograms. It is something.

Since holograms reproduce three-dimensional images, they are preferred for their excellent design and are used for covers of books, magazines, etc., POP displays, gifts, and the like.

In addition, since holograms are equivalent to recording information on the submicron order, they are also used to prevent the creation of securities, credit cards, etc.

(Prior art) Conventionally, when mass-producing relief-type holograms, a mold is made from a photoresist on which an uneven relief pattern is formed as a base plate by metal plating, etc., and the mold is used to coat the base material. There is a known method for mass-replicating holograms by thermo-pressing molded thermoplastic resin, but this method requires a large number of steps to create the mold, and quality control is difficult. Since this method requires a large amount of time and labor, there is a problem in that it leads to high product prices.

Therefore, as a method to solve the above problem, instead of using a mold, we use electron beam, ultraviolet curable resin, thermoplastic resin, etc.
A method using thermosetting resin is disclosed in Japanese Patent Application Laid-Open No. 58-18498.
However, in the method described in the above publication, when producing a duplicate hologram using a resin mold, an electron beam or ultraviolet curable resin is brought into close contact with the resin mold. Alternatively, since the resin mold is cured and shaped by ultraviolet irradiation, the resin mold itself may be deteriorated by the irradiation of high-energy rays in layers, which may impede ensuring stable quality. In addition, when making a resin mold using thermosetting resin alone, heat is applied to the photopolymer that is the hologram at the same time as heating the thermosetting resin, so the increased adhesive strength between the thermosetting resin and photopolymer may make it difficult to separate. There is a possibility that
Furthermore, there are other problems such as curing shrinkage of the thermosetting resin, which damages the relief pattern of the hologram master, making it impossible to reuse the hologram master. Furthermore, since the resin mold disclosed in the above-mentioned publication does not have sufficient heat resistance, holograms could not be manufactured by heating and pressing, which is suitable for mass production.

(Intelligence to be Solved by the Invention) The tJi8 to be solved by the present invention is as described above. Alternatively, by using a mixture of monomers and acrylate or methacrylate having an isocyanurate ring structure in the molecule and making this into a replica mold, the manufacturing process of the replica mold can be shortened and the manufacturing quality can be stabilized. be.

In addition, it provides heat resistance and mechanical strength that can withstand heating and pressure embossing to the thermoplastic resin in the subsequent process, making it possible to mass-produce holograms with stable quality using a replication device that uses heat and pressure, which is simple in principle. The purpose of this is to provide a copy type that can be reproduced.

(Means for Solving the Problems) That is, the present invention provides an electron beam- or ultraviolet-curable acrylate resin or monomer and isocyanate resin in the molecule on an electron-beam or ultraviolet-transparent film or sheet-like support. A resin layer made of a mixture of acrylate or methacrylate having a nurate ring structure is provided, and then the resin layer is brought into close contact with a hologram master having a fine relief pattern on the surface, and the resin layer is cured by irradiation with an electron beam or ultraviolet rays. This is a hologram replica type obtained by peeling it from the hologram original plate after applying it.

Furthermore, the hologram is manufactured by bonding the hologram replica mold onto a thermoplastic resin layer under heat and pressure, and then separating the mold from the thermoplastic resin layer.

Here, the electron beam or ultraviolet curable acrylate resin used in the present invention includes ester acrylate, ester methacrylate, epoxy acrylate, epoxy methacrylate, urethane acrylate, and urethane acrylate containing at least two or more acryloyl groups in one molecule. It is methacrylate.

Further, the acrylate or methacrylate having an isocyanurate ring structure in the molecule is an ester acrylate or an ester methacrylate containing at least three or more acryloyl groups in one molecule. When the resin layer is cured, an electron beam is irradiated from the support side to produce a hologram replica mold.

(Detailed description of the invention) Hereinafter, the present invention will be explained in detail using the drawings.

First, FIGS. 1 to 3 show a method for manufacturing a hologram replication type according to the present invention, and FIGS. 4 to 5 relate to a method for mass-reproducing holograms, and are explanatory cross-sectional views of each.

First, the constituent materials will be explained, and then the manufacturing process will be explained.

In Figure 1, (1) is a film or sheet-like support, and (2) is an electron beam or ultraviolet curable acrylate resin or a monomer and an acrylate or methacrylate having an isocyanurate ring structure in the molecule. A resin layer made of a mixture, (3) a photoresist layer on which a relief pattern, which is a hologram original, is formed, and (4) a base material for the photoresist, which is usually a glass plate.

The film or sheet support (1) that is transparent to electron beams or ultraviolet rays according to the present invention has appropriate heat resistance and mechanical strength that can withstand the heating of the thermoplastic resin in the subsequent process and the heating during pressure embossing molding. , surface smoothness is required, and specifically polyester, polycarbonate, etc. can be used, and the thickness is preferably about 20 to 200 μm. Furthermore, engineering plastic films made of polyimide, polyetheretherketone, polyetherimide, polyphenylene sulfide, polyarylate, etc. can also be used.

Further, as the electron beam or ultraviolet curable acrylate used for the resin layer (2), general ester acrylate, ester methacrylate, epoxy acrylate,
Epoxy methacrylate, urethane acrylate, and urethane methacrylate can be used, but those that have at least two functionalities and provide a cured film with a high crosslinking density are preferred. The acrylate or methacrylate having an isocyanurate ring structure to be mixed is preferably at least trifunctional or higher in order to impart good heat resistance to the hologram replicating mold.

The mixing ratio of the electron beam or ultraviolet curable acrylate resin or monomer to the acrylate or methacrylate having an isocyanurate ring structure is preferably in the range of I:0.05 to l:1 in terms of weight ratio, but the material Since the optimum mixing ratio will change if the type of curing agent, electron beam or ultraviolet curing conditions, etc. change, it is not limited to this range.

As the photoresist layer (3) on which the relief pattern of the hologram original plate A is formed, generally widely used resists for semiconductors can be used, but a positive resist with particularly excellent resolution is preferable, and the product name is MICROP.
O5IT1400 (manufactured by Sibley), 0FPR800 (
(manufactured by Tokyo Ohka Co., Ltd.) and Way Coat HPR (manufactured by Hunt Co., Ltd.) are commercially available. Photoresist base material (4)
Since smoothness is required, a glass plate is usually used.

In FIG. 4, (5) is a thermoplastic resin layer, and (6) is a thermoplastic resin base material.

The thermoplastic resin layer (5) is made of polyester resin, polystyrene, styrene-acrylic copolymer, polyvinyl chloride,
Polyvinyl acetate, vinyl chloride/vinyl acetate copolymer, polyvinyl acecool, alkyd resin, acrylic resin, polyacrylonitrile, polycarbonate, polyketone, etc. can be used.

As the thermoplastic resin base material (6), polyester, polypropylene, polycarbonate, cellophane, etc. can be used, and the above-mentioned electron beam or ultraviolet transparent film can also be used. A film or sheet with a thickness of 10 μm or more is preferable.

Next, the manufacturing process will be explained.

First, in FIG. 1, a mixture of an electron beam or ultraviolet curable acrylate resin or monomer and an acrylate or methacrylate having an isocyanurate ring structure is coated on a film or sheet-like support (1) with a knife coating. After the resin layer (2) is formed by coating by a known method such as , spin code, roll coating, bar code, etc., it is brought into close contact with the photoresist surface of the hologram master A having an uneven shape. The photoresist is applied to a glass plate with a thickness of 2 to 3 mm using a spin cord so that the film thickness is approximately 1 to 3 μm, exposed to an argon laser, and then developed with a specified developer to create a relief image. This is what I did.

Next, as shown in FIG. 2, the resin layer is cured by irradiating electron beams or ultraviolet rays from the support (1) side. Then, by peeling off the surface of the hologram master A, a hologram replica mold B consisting of a support and a cured resin layer is obtained as shown in FIG. In this case, in order to perform a sufficient curing reaction, the electron beam irradiation amount is 1.0 Mrad.
As mentioned above, in the case of ultraviolet rays, it is preferable that the intensity is ICIOmJ/cm'' or more.

Next, as shown in FIG. 4, the hologram replica mold B obtained by the above-mentioned method is brought into close contact with the thermoplastic resin layer (5), simultaneously subjected to heat and pressure embossing molding, and then peeled off. As shown in the figure, a final hologram replica C is obtained.

(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples.

(Example-1) Using MICROPO3IT1400 (manufactured by Sibley) as a photoresist, a photoresist layer with a film thickness of 1.5 μm was prepared on a base material consisting of a glass plate with a thickness of 3 mm, and interference fringes of a three-dimensional object were formed. Instead, after exposing interference fringes of 13001 ine/mm for about 1 minute using three-beam interferometry using an argon laser (wavelength 457.9 nm, intensity 50 mJ/cm), a grating was created by alkaline development, and this was applied to the hologram original plate. It was used as an alternative.

Next, a mixture of an electron beam curable acrylate resin with the following composition and an acrylate having an isocyanurate ring structure was placed on a support made of a polyimide film with a thickness of 75 μm (Nibirexfu 5S corona treatment grade, manufactured by Ube Industries, Ltd.). was coated with a wire bar to a thickness of about 5 μm to form a resin liquid layer. Next, the resin liquid layer was brought into close contact with the grating relief surface, which is a substitute for the hologram original plate, and then from the support side. , 200Ke
Irradiate with an electron beam of V at an absorbed dose of 6 Mr ad,
Thereafter, by peeling it off from the hologram master, a hologram replica mold consisting of a support and a hardened resin layer was produced. Peeling between the cured resin layer and the photoresist was good.

Next, a thermoplastic resin layer having the following composition was coated to a thickness of about 10 μm on a base material made of a polyester film having a thickness of 50 μm using a wire bar, thereby producing a film for a replicated hologram.

Next, the relief surface of the hologram duplication mold was applied to the thermoplastic resin layer surface of the duplication hologram film at a weight of about 30 kg/cm.
A replicated hologram product was obtained by applying heat to the support surface of the hologram replication mold at 150° C. for 3 seconds and then peeling off the thermoplastic resin layer surface and the hologram replication mold. Furthermore, even after repeating the same heat-pressure embossing duplication process 200 times, a duplication product was obtained that gave bright, clear, and sharp diffracted light.

(Example-2) A mixed solution of an ultraviolet curable acrylate having the following composition and an acrylate having an isocyanurate ring structure was prepared to a thickness of 100 mm.
The resin liquid layer was coated onto a support made of a .mu.m polyester film using a wire bar to a thickness of about 5 .mu.m. Thereafter, a hologram replica mold was produced under the same conditions as in Example-1.

Next, under the same method and conditions as Example-1, 400 mJ
After irradiating the polyester film with ultraviolet rays of "/cm" from the polyester film side, it was peeled off and a relief pattern was created on the same thermoplastic resin layer as in Example 1 to obtain a replicated product. Even after 200 copies, it remained bright and clear. We obtained a replica that gives a unique diffracted light.

(Effects of the Invention) As described above, according to the method for manufacturing a hologram according to the present invention, it is possible to significantly shorten the steps in manufacturing a hologram replica mold and save time accordingly.

In addition, when creating a hologram replication mold, by using electron beams or ultraviolet rays, the curable resin layer is not heated (because it is cured, the relief pattern can be peeled off and replicated without damaging the mother mold). is possible,
Furthermore, by using acrylate or methacrylate having an isocyanurate ring structure as one component of the cured resin, it is possible to impart good physical and chemical heat resistance and mechanical strength that can withstand a large amount of heat-pressure duplication.

Therefore, by using the hologram duplication mold obtained by the above method, a large amount of holograms with clear images and stable quality can be produced on thermoplastic resin using a method using heating and pressure embossing, which is simple in principle. This has the great effect of making replication possible in a short time.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are cross-sectional explanatory views of a method for manufacturing a resin mold for hologram replication, and FIGS. 4 and 5 are cross-sectional views showing a method for mass-reproducing holograms. (1)...Support (2)...Resin layer (3)...Photoresist (4), (6)...Base material (5)・・・・・・Thermoplastic resin top A・・・・・・Hologram original plate B・・・・・・Replication type C・・・・・・Hologram replica Figure 1 Figure 2 Figure 3 Patent Applicant Toppan Printing Co., Ltd. Representative Kazuo Suzuki Figure 4 Figure 5

Claims (7)

[Claims] (1) A mixture of an electron beam- or ultraviolet-curable acrylate resin or monomer and an acrylate or methacrylate containing an isocyanurate ring structure in the molecule on an electron-beam or ultraviolet-transparent film or sheet-like support. A hologram duplication type that is provided with a resin layer consisting of a resin layer, and a fine relief pattern is formed on the surface of the resin layer. (2) A mixture of an electron beam- or ultraviolet-curable acrylate resin or monomer and an acrylate or methacrylate containing an isocyanurate ring structure in the molecule on an electron-beam or ultraviolet-transparent film or sheet-like support. A hologram in which a resin layer is provided, the resin layer is closely attached to a hologram master having a fine relief pattern on the surface, the resin layer is cured by irradiation with electron beams or ultraviolet rays, and then peeled off from the hologram master. Manufacturing method for replica molds. (3) The method for manufacturing a hologram duplication type according to (2), wherein the electron beam is irradiated from the support side. (4) A claim in which the acrylate resin or monomer consists of any one of ester acrylate, ester methacrylate, epoxy acrylate, epoxy methacrylate, urethane acrylate, and urethane methacrylate containing at least two or more acryloyl groups in one molecule ( 1) The hologram reproduction type described. (5) A claim in which the acrylate resin or monomer consists of any one of ester acrylate, ester methacrylate, epoxy acrylate, epoxy methacrylate, urethane acrylate, and urethane methacrylate containing at least two or more acryloyl groups in one molecule ( 2) or (3) the method for manufacturing a hologram replication type; (6) Claim (1) characterized in that the acrylate or methacrylate containing an isocyanurate ring structure in the molecule is an ester acrylate or ester methacrylate containing at least three or more acryloyl groups in one molecule. The hologram reproduction type described. (7) A method for producing a hologram, by heat-pressing the duplication mold according to claim (1) onto a thermoplastic resin layer of a base material having a thermoplastic resin layer, and then removing the duplication mold.