JPH08305264A - Fabrication of relief-pattern duplicating plate - Google Patents

Abstract

PURPOSE: To prevent contamination of an original duplicating plate during duplication so as to stabilize product quality and reduce fabrication period and to provide a wide choice of resins by forming a thin metallic film in advance on a thermoplastic or thermosetting resin sheet or film for use in the fabrication of the original plate for a relief-pattern duplicating mold that employs thermocompression embossing. CONSTITUTION: A thin metallic film 2 is formed over a thermoplastic or thermosetting resin sheet or film 1 to provide a subject A to be embossed. After the subject A to be embossed is installed on the lower surface plate 5 of a press with the thin metallic film 2 up and is set in a desired position, an original duplicating plate 3 is heated and bonded under pressure by means of the upper surface plate 4 of the press. Next, a duplicating mold 6 is fabricated by electroforming or by a method of patterning a radiation-setting resin through exposure to radiation, etc. When the duplicating mold 6 is fabricated by electroforming, metallic thin film 2 may be made of a metal with conductivity by which it is usable as electroforming metal; when a resin is employed, the metallic thin film 2 is usable in a wide range of film thickness of about 0.04 to 0.2μm and the material from which the film is made is not limited to particular ones.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a relief pattern replica plate, and more particularly to a method for producing a plate for replicating a relief pattern such as a surface relief hologram. . A hologram is preferred for its excellent design because it reproduces a three-dimensional stereoscopic image, and is used for a cover of a book, a POP display, a gift, and the like. Further, since it is equivalent to recording information of submicron order, it is used for preventing forgery of securities, credit cards and the like.

With the method for producing a relief pattern duplication plate according to the present invention, it becomes possible to supply a surface relief hologram having a shorter delivery time and a stable quality.

[0003]

2. Description of the Related Art As a method for producing a relief pattern duplication plate using a thermoplastic resin or thermosetting resin sheet or film as a master plate by hot-press embossing, a relief pattern duplication is disclosed in JP-A-4-151189. A method is disclosed.

In this case, a resin or metal duplication original plate is adhered to a thermoplastic or thermosetting resin sheet or film and heated and pressed to emboss the duplication of the relief pattern, and the thermoplastic or thermosetting resin sheet or film is embossed. This is a process of producing a resin or metallic replica using a resin sheet or film as an original plate.

[0005]

However, when a replication mold is further prepared from a thermoplastic or thermosetting resin sheet or film in which the relief pattern is replicated, when the replication mold is prepared by resin, There is a problem that the duplicated relief pattern may disappear due to the compatibility with the resin, and the type of resin that can be used is limited.

Further, in order to produce a duplication mold of metal by electroforming or the like, it is necessary to emboss a relief pattern on the thermoplastic or thermosetting resin sheet or film and then form a conductive film. The type of resin that can be used is limited when using the silver mirror spray of, and when using vacuum deposition or sputtering, it takes a considerable amount of time to reach a vacuum degree that is possible, and it is short. There was a problem that it was an obstacle to delivery.

Further, depending on the type of resin used, in the process of heat and pressure embossing duplication, impurities such as plasticizers adhere to the duplication original used for duplication of the relief pattern, and in the case of a relief hologram. Had a problem that the pattern became dark.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to prevent the embossed body from being restricted by the conventional method as described above and to cope with a shorter delivery time. An object of the present invention is to provide a method for manufacturing a relief pattern duplication plate that can reduce or eliminate quality deterioration due to stains on the duplication original plate in the embossing duplication process.

[0009]

In order to achieve the above object, the present invention provides a relief original plate having a relief pattern having an uneven surface on any sheet or film of a thermoplastic resin or a thermosetting resin. In the process of closely contacting the position, duplicating the relief pattern on the film or sheet by applying heat and pressure, and making a duplicate mold using the film or sheet as an original plate, a metal thin film is previously formed on the surface of the film or sheet. To form an object to be embossed.

Further, the present invention is characterized in that the metal film formed in advance has such a conductivity that it can be used as an electroformed electrode.

Further, according to the present invention, the step of duplicating a relief pattern is performed a plurality of times by changing the position of the duplication original plate to obtain a sheet- or film-like embossed body having a large area on which the relief pattern is attached. The feature is that a multi-faced replication mold is produced using the embossed body as the original plate.

The structure of the present invention will be described in detail below with reference to the drawings.

First, a master hologram is formed on the surface of a photosensitive layer such as a photoresist by a known method (optical method using coherent light such as laser, direct interference fringe drawing using electron beam, etc.). (Not shown).

Next, a master plate (not shown) is obtained from the master hologram by a known method (sputtering → electroforming, etc.).

At this time, it should be noted that the master hologram (photosensitive layer) cannot be used after the master plate is prepared once, so the prepared master plate must be stored carefully. It is better to use the next generation plates (children, grandchildren) made from it to avoid wasting the master plate. When using the next generation version, the master hologram (parent) is the reverse version of the master hologram (self), and the pattern inversion is repeated from child to grandchild, so ... It is necessary to be careful so that it does not become the reverse image of the pattern. Hereinafter, for convenience of description, a stamper that is used as a reference for replicating a relief hologram regardless of generation is referred to as a replica master.

First, as shown in FIG. 1A, an arbitrary thermoplastic or thermosetting resin sheet or film 1 is prepared. At this time, it is also possible to use a multilayered sheet or film in which a relief pattern forming layer made of a thermoplastic or thermosetting resin is provided on a substrate made of a thermoplastic or thermosetting resin sheet or film. Is.

Next, as shown in FIG. 1B, a metal thin film 2 is formed on the thermoplastic or thermosetting resin sheet or film 1 to form an embossed body A.

For forming the metal thin film 2, known vacuum deposition or sputtering can be used.

When a metallic duplication mold is produced by electroforming or the like using an embossed body whose relief pattern is duplicated by the embossing molding described later as an original plate, it depends on the metal used, but an electroforming device is used in a later step. The internal stress does not increase even if it touches the liquid etc. used in 40-
It is desirable to form it with a thickness of about 80 nm. In this case, the material of the metal thin film is not particularly limited as long as it is a metal material that is easy to perform electroforming, that is, has a conductivity that can be used as an electroformed electrode.

Further, when a resin-made duplication mold is produced by using an embossed body having a relief pattern duplicated by embossing as a master, the thickness of the duplication mold used for emboss duplication depends on the film thickness which covers the substrate to some extent. 0.04-0.2 up to a film thickness that does not hinder the duplication of the relief pattern
It is possible to form and use a thin film in a wide range of about μm. The material of the metal thin film in this case is not particularly limited as long as the resin of the molding layer is concealed, and various metals can be arbitrarily used.

Next, as shown in FIG. 1 (c), the embossed body A is placed on the lower surface plate 5 of the pressing device with the metal thin film 2 surface facing upward, and is set at a desired position. Three
Is heated and pressed on the upper surface plate 4 of the press machine to be pressure-bonded. After the proper time required for embossing duplication has elapsed, the heating is released and the temperature is cooled to the proper temperature in the state of being crimped. Thus
The relief pattern is duplicated on the object A to be embossed.

It is also possible to repeat the above step (c) while changing the position and type of the embossed body or the original plate to be duplicated a desired number of times to carry out multiple imprinting of the relief pattern.

Then, as shown in FIG. 1 (d), a relief pattern reproduced on the embossed body A is subjected to a predetermined method (electroforming or patterning by irradiating radiation-curable resin with radiation). A replica mold 6 (FIG. 1E) is produced.

[0024]

According to the present invention, a metal thin film is preliminarily formed on a thermoplastic or thermosetting resin sheet or film, which is used for producing an original plate for a relief pattern replication mold by hot pressure embossing molding, When the relief pattern is duplicated by hot-press embossing, the original plate is prevented from becoming dirty and its quality is stabilized. At the same time, when a metallic duplicating mold is produced by electroforming, a conductive film is formed first. In order to shorten the delivery time and to manufacture a resin-based replication mold, consider the compatibility of the resin due to the presence of a metal film between the resin to be embossed and the resin to be the replication mold. It becomes possible to select the resin without any need.

[0025]

EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 (1) Preparation of Master Hologram A photoresist layer (MICRO-POSIT1400 Shipley Co., Ltd.) having a thickness of about 1.5 μm is formed on a glass substrate having a thickness of 3 mm, and an argon laser (wavelength 457.
After exposing the interference fringes with a spatial frequency of 1300 lines / mm for about 1 minute in the outline of a square of 10 × 10 cm ² by the two-beam interferometry using 9 nm and an intensity of 50 mJ / cm ² ),
The master hologram was obtained by subjecting it to alkali development. (2) Preparation of Master Plate (Reproduction Master Plate) A conductive film made of nickel metal as a target material was formed on the relief-formed surface of the master hologram by sputtering to a thickness of about 50 nm. Then, electroforming was performed using the nickel conductive film as an electrode to obtain a master plate (reproduction original plate). (3) Preparation of object to be embossed As a material to be embossed, a sheet having a thickness of 0.5 mm and made of acrylic resin of 20 cm square (Technoloy manufactured by Sumitomo Kasei) was used to form a nickel thin film having a thickness of about 80 nm by sputtering.

In addition to the above acrylic resin, polyester, polyethylene,
A sheet or film made of a thermoplastic or thermosetting synthetic resin such as vinyl chloride or polycarbonate can be used.

A sheet having a multi-layer structure in which the above-mentioned sheet or film is used as a base material, and acrylic, polyvinyl chloride, polyvinyl acetate, polyester, polyethylene, or a copolymer thereof is used as a molding layer as a relief pattern forming layer. Alternatively, a film can be used as the material of the object to be embossed. (4) Emboss duplication of relief pattern on embossed object Placed on the lower surface plate of the flat press machine so that the metal thin film forming surface side of the embossed object faces upward, and press so that the relief surface side of the original plate for duplication faces downward. After the duplicate original plate was fixed on the upper plate of the apparatus, heating and pressurization was performed from the upper plate.

The temperature of the heating / pressurizing section (reproduction master side) of the flat press machine is heated up to 110 ° C., and the pressure is 5 kg / c.
and pressed for 120 seconds at m ^2. After a lapse of a predetermined time, the temperature of the heating and pressing portion was lowered, the press was released, and an embossed body in which a relief pattern was duplicated was obtained.

By changing the position of the object to be embossed in the above process,
By repeating the process, it is possible to obtain an embossed body having a large area and a large number of relief patterns duplicated. (5) Manufacture of replication mold from object to be embossed By performing electroforming from the relief pattern forming surface of the object to be embossed using the thin film formed by nickel sputtering as described above as an electrode, a thickness of about 150 μm is obtained.
After forming the nickel plating layer of m, the embossed body was peeled off, and the attached resin was removed to obtain a nickel metal replica plate having a relief pattern. <Example 2> (1) The same master hologram as in Example 1 is used (the step (1) is the same). (2) Preparation of Master Plate A polyarylate film having a thickness of 0.1 mm (Emblate U1-100 manufactured by Unitika Ltd.) was used as a support, and a resin layer having the following composition and serving as a relief-forming layer in the master plate was formed thereon. The thickness was about 5 μm and was formed by wire bar coating.

UV-curable acrylate resin composition : neopentyl glycol-modified trimethylolpropane diacrylate: 70 parts by weight pentaerythritol triacrylate: 30 parts by weight 2-hydroxy-2-methyl-1-phenylpropan-1-one 5 parts by weight Next, in the master plate, the resin layer side for molding the relief pattern and the relief surface side of the master hologram are faced to each other, and ultraviolet rays of 500 mJ / cm ² are irradiated from the support side to cure the resin, The master hologram was peeled off to obtain a master plate. (3) Preparation of object to be embossed A polyester sheet having a thickness of 0.5 mm was used as a base material, and a cyclohexanone solution (10 wt%) of an acrylic resin (Dianal BR-118 manufactured by Mitsubishi Rayon Co., Ltd.) was used as a relief pattern forming layer thereon. Dry film thickness is 1-2
Wire bar coating to 90μm, 90 ℃
And dried for 30 minutes to prepare a resin plate as a material for the embossed body.

As the base material, in addition to the above polyester sheet, synthetic resin such as acrylic, polyethylene, vinyl chloride, polycarbonate, or synthetic paper can be used. As the molding layer, polyvinyl chloride, polyvinyl acetate, polyester, polyethylene, a copolymer thereof, or the like can be used in addition to the acrylic resin described above.

An aluminum thin film having a thickness of about 80 nm was formed on the produced resin plate by a vacuum vapor deposition method to obtain an embossed body. (4) Emboss duplication of relief pattern on embossed object Placed on the lower surface plate of the flat press machine so that the metal thin film forming surface side of the embossed object faces upward, and press so that the relief surface side of the original plate for duplication faces downward. After the duplicate original plate was fixed on the upper plate of the apparatus, heating and pressurization was performed from the upper plate.

The temperature of the heating / pressurizing section (reproduction master side) of the flat press machine is heated up to 90 ° C., and the pressure is 5 kg / cm.
^It was crimped at ² for 120 seconds. After a lapse of a predetermined time, the temperature of the heating and pressing portion was lowered, the press was released, and an embossed body in which a relief pattern was duplicated was obtained.

It is also possible to obtain an embossed body in which a large number of relief patterns are duplicated in a large area by changing the position of the embossed body and repeating the above steps as in the case of the first embodiment. (5) Preparation of replication type from embossed body An ultraviolet curable acrylate resin having the above composition was applied on the surface of polyarylate film (Emblate U1-100 Unitika Ltd.) to a thickness of 5 μm, and the acrylate resin side was applied. , Close contact with the relief forming surface of the object to be embossed,
After the resin was cured by irradiating it with ultraviolet rays of 500 mJ / cm ² from the polyarylate film side, it was peeled from the object to be embossed to obtain an acrylic resin replication mold. Comparative Example (1) The same master hologram as in Example 1 is used (the step (1) is the same). (2) Preparation of Master Plate A polyarylate film having a thickness of 0.1 mm (Emblate U1-100 manufactured by Unitika Ltd.) was used as a support, and an ultraviolet curable acrylate resin having the above-mentioned composition was formed on the support.
A resin layer, which serves as a relief forming layer in the master plate, was applied and formed by wire bar coating so as to have a thickness of about 5 μm.

Next, in the master plate, the resin layer side for molding the relief pattern and the relief surface side of the master hologram are opposed to each other, and 500 mJ from the support side.
After irradiating with ultraviolet rays of / cm ² , the master hologram was peeled off to obtain a master plate (same as in Example 2). (3) Preparation of object to be embossed A polyester sheet having a thickness of 0.5 mm was used as a base material, and a cyclohexanone solution (10 wt%) of an acrylic resin (Dianal BR-106 manufactured by Mitsubishi Rayon Co., Ltd.) was formed thereon as a relief pattern forming layer. Dry film thickness is 1-2
Approximately 90 by wire bar coating
A resin plate as a material of the body to be embossed was manufactured by drying at 30 ° C. for 30 minutes.

For comparison, an embossed body was formed without forming a metal thin film on the resin plate. (4) Embossing duplication of relief pattern on embossed body Placed on the lower surface plate of the flat press machine so that the relief pattern forming layer side of the embossed body faces upward, and press so that the relief surface side of the original plate for duplication faces downward. After the duplicate original plate was fixed on the upper plate of the apparatus, heating and pressurization was performed from the upper plate.

The temperature of the heating / pressurizing section (reproduction master side) of the flat press machine is heated up to 90 ° C., and the pressure is 5 kg / cm.
^It was crimped at ² for 120 seconds. After a lapse of a predetermined time, the temperature of the heating and pressing portion was lowered, the press was released, and an embossed body in which a relief pattern was duplicated was obtained. (5) Preparation of replication mold from embossed body An ultraviolet curable acrylate resin having the above-mentioned composition was applied on the surface of the polyarylate film to a thickness of 5 μm, and the acrylate resin side was applied to the relief forming surface of the embossed body. Adhere closely, 500 mJ / c from the polyarylate film side
It was irradiated with m ² of ultraviolet rays.

Although the ultraviolet-curable resin was cured by the irradiation of ultraviolet rays, the resin of the relief pattern forming layer was melted and a duplication mold could not be produced well.

[0039]

As described in detail above, according to the present invention, on a thermoplastic or thermosetting resin sheet or film used for producing an original plate for a relief pattern replication mold by hot pressure embossing molding. By forming a thin metal film in advance on the original plate, the original plate is prevented from becoming dirty when the relief pattern is reproduced by hot-press embossing and the quality is stabilized, and at the same time, a metallic replica mold is produced by electroforming or the like. In this case, if the conductive film is formed in advance to shorten the delivery time and to manufacture a resin replication mold,
The presence of the metal film between the resin to be embossed and the resin to be used as the replication type makes it possible to select the resin without considering the compatibility of the resin.

That is, according to the present invention, it is possible to provide an effective method that leads to the possibility of cost reduction by shortening the delivery period, stabilizing the quality of products, and expanding the range of resin selection. Produce an effect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of a manufacturing method of the present invention in process order.

[Explanation of symbols]

1 Sheet or Film of Thermoplastic Resin or Thermosetting Resin 2 Metal Thin Film 3 Resin or Metallic Reproduction Master Plate 4 Upper Plate of Press Machine 5 Lower Platen of Press Machine 6 Resin or Metallic Replication Mold A A Embossed Object

Claims (3)

[Claims] 1. A duplicate original plate of a relief pattern having an uneven surface is adhered to an arbitrary position on a thermoplastic resin or thermosetting resin film or sheet, and heat and pressure are applied to the film or sheet. The relief pattern is characterized in that a metal thin film is formed in advance on the surface of the film or sheet in the step of producing a duplicate mold by duplicating the relief pattern on the film or sheet as an original plate. Manufacturing method of reproduction plate. 2. The method for producing a relief pattern replication plate according to claim 1, wherein the metal film formed in advance has a conductivity that allows it to be used as an electroformed electrode. 3. A sheet or film-like embossed body having a large area on which relief patterns are multi-faced is obtained by performing the step of duplicating the relief pattern a plurality of times by changing the position of the duplication master, and the embossed body is The method for producing a relief pattern duplication plate according to claim 1 or 2, wherein a multi-faced duplication mold is produced as an original plate.