JP2798619B2 - Volume hologram transfer sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume hologram transfer sheet suitable for transferring a hologram to a surface of a credit card, a bank card, a book cover, a record jacket, or the like.

[0002]

2. Description of the Related Art A hologram generally records a pattern of light interference, and utilizes the characteristic that high-density information recording such as recording of a three-dimensional image is possible. It is expected to be used as an optical memory and to be applied to various other fields.

Conventionally, in order to provide a volume hologram on the surface of a card, book cover, record jacket, or the like, an adhesive sheet obtained by bonding a replicated volume hologram layer to a base film or the like is used. And so on.

[0004] However, it is difficult to mass-produce a conventional sheet used for providing a replicated volume hologram on the surface of an article, and such a sticking sheet also includes a base film. However, there is a problem that the thickness increases, and a step occurs on the surface of cards and the like.

The present invention has been made based on the above background, and an object of the present invention is to provide a volume hologram in which a volume hologram can be efficiently and thinly provided on an article surface such as a card or a book cover. An object of the present invention is to provide a transfer sheet and a method for producing the same.

[0006]

The above object is achieved by the volume hologram transfer sheet of the present invention.

That is, in the volume hologram transfer sheet according to the present invention, a volume hologram layer and an adhesive layer are provided in this order on a substrate film to be peeled, and a light-absorbing dye or pigment is provided on the adhesive layer. It is characterized by being contained.

In a preferred embodiment of the present invention, a printing ink layer can be formed between the substrate film and the volume hologram.

[0009] In a preferred embodiment of the present invention,
An overprint layer can be formed between the base film and the volume hologram.

Further, in a preferred embodiment of the present invention,
An overprint layer can be formed between the base film and the printing ink layer.

In another embodiment of the present invention, a release layer can be formed between the base film and the overprint layer.

In another embodiment of the present invention, a release layer can be formed between the base film and the volume hologram layer.

In another embodiment of the present invention, a release layer can be formed between the base film and the printing ink layer.

Hereinafter, the present invention according to a preferred embodiment will be described in detail together with a manufacturing method with reference to the accompanying drawings.

As shown in FIG. 1, a volume hologram transfer sheet 1 according to the present invention comprises a base film 2 to be peeled.
Above, the volume hologram layer 3 and the adhesive layer 4 are formed in this order.

FIG. 2 is a schematic sectional view showing another embodiment of the volume hologram transfer sheet according to the present invention. In this example, the volume hologram transfer sheet 1 has a volume hologram layer 3 and an adhesive layer 4 provided in this order on a base film 2 to be separated via a release layer 5 and an overprint layer 6. I have.

In the production of the volume hologram transfer sheet according to the present invention, first, in a first step, a printing ink layer is formed on one side of a substrate film to be peeled, if desired.

As the substrate film that can be used in the present invention, any material that can be used as a substrate of a transfer sheet is used, and preferably, a transparent or translucent film-like material can be used. Specifically, there are polymer films such as polyethylene terephthalate, polystyrene, polyimide, polymethyl methacrylate, polyvinyl butyral, and polycarbonate, ceramic films, and laminates thereof. The dimensions and shape of the substrate film are arbitrary, for example, the film thickness is 1 to 200 μm,
Preferably, it is 10 to 50 μm.

In the present invention, a release layer can be formed before the application of the volume hologram material onto the substrate film. It provides releasability between the print layer, between the base film and a printing ink layer described later, or between the base film and the volume hologram layer.

Examples of the material forming the release layer include acrylic resins, cellulose resins, vinyl resins, polyester resins, urethane resins, olefin resins, amide resins, and epoxy resins. The thickness of the release layer is set to 0.
It is from 0.05 to 10 μm, preferably from 0.2 to 2 μm. When the volume hologram layer, the printing ink layer or the overprint layer has releasability, such a release layer is not essential.

As described above, an overprint layer can be formed on one side of the base film before the application of the volume hologram material. In this case, the formed overprint layer has an adhesive property between the layers. And protects the outermost surface of the sheet after transfer and serves to impart durability.

Here, the overprint layer that can be used includes a curable acrylic resin, a cellulose resin, a vinyl resin, a polyester resin, a urethane resin, an olefin resin, an amide resin, an epoxy resin, and the like. Is known as a conventional overprint layer. Overprint layer thickness is 0.05 ~
It is 10 μm, preferably 0.2 to 2 μm. The volume hologram layer plays the role of an overprint layer,
This overprint layer is not essential if the printing ink layer does not need to be particularly protected.

In the volume hologram transfer sheet of the present invention, a printing ink layer can be provided between the base film and the volume hologram layer. The printing ink layer is for recording information such as two-dimensional characters and patterns in synchronization with a three-dimensional pattern or the like recorded in the volume hologram layer. Usable printing inks include ordinary inks such as gravure printing inks and screen printing inks. The layer thickness of the printing ink layer is 0.1 to 50 μm, preferably 5 to 20 μm.

In the present invention, the volume hologram layer is
It is provided on any of the substrate film surface, the release layer, the overprint layer and the printing ink layer. This volume hologram layer is formed by applying a volume hologram recording material or the like. This volume hologram recording material includes a silver salt emulsion, a dichromate gelatin emulsion, a photopolymerizable resin,
Including a photocrosslinkable resin. A hologram is formed by contacting and exposing a master volume hologram, in which interference fringes corresponding to the wavefront of light from an object are recorded in the layer in the form of transmittance modulation and refractive index modulation, on the coating surface of the volume hologram material and exposing it. (Contact replication method). The layer thickness of the volume hologram layer is 0.
It is 1 to 50 μm, preferably 5 to 20 μm.

In the present invention, after the volume hologram layer is formed, an adhesive is applied to the surface of the volume hologram layer to form an adhesive layer. This adhesive layer functions to adhere the volume hologram transfer sheet to the surface of credit cards, bank cards, book covers, record jackets, and the like. Examples of the adhesive include acrylic resin, vinyl resin, and polyester resin. Conventionally known adhesives such as resin, urethane-based resin, amide-based resin, and epoxy-based resin can be used. The method of applying the adhesive is arbitrary.

In the present invention, the adhesive layer contains a light-absorbing dye or pigment, for example, a black dye or pigment. With this addition, the contrast of the hologram image can be improved. The thickness of the adhesive layer is 0.1 to 50 μm, preferably 0.5 to 10 μm.

A hologram generally records a pattern of light interference, and enables high-density information recording, including recording of a three-dimensional image. In the recording layer of the volume hologram transfer sheet of the present invention, interference fringes corresponding to the wavefront of light from an object are recorded in the layer in the form of transmittance modulation and refractive index modulation.

In the transfer sheet of the present invention including a recording layer,
The base film is peeled off from the volume hologram layer during use, while the volume hologram layer is quickly and easily bonded to the surface of credit cards, bank cards, book covers, record jackets, etc. by an adhesive layer.

According to the present invention, the following effects can be obtained.

That is, in the volume hologram transfer sheet according to the present invention, the volume hologram may be efficiently provided on the surface of an article such as a card or a book cover by a thermal transfer method or the like, and may be thinly provided without causing irregularities on the surface. it can.

Further, in the volume hologram transfer sheet according to the present invention, since the adhesive layer contains a light absorbing dye or pigment, the contrast of the hologram image can be improved, and the hologram effect is further improved. The volume hologram having the image information can be formed quickly and easily.

Further, in the present invention, since the above-described configuration is employed, an effect of concealing the base of the object to be transferred after the transfer of the volume hologram is also exerted.

[0033]

The present invention will now be described more specifically with reference to production examples. Example A 25 μm thick polyethylene terephthalate film was used as a base film and an acrylic resin (Acrynal # 100, acrylic resin, manufactured by Toei Kasei Co., Ltd.) was used as a release layer.
5 μm thick, and a 4 μm thick sensitizer (Irgar Cure 184, manufactured by Ciba Geigy Co., Ltd.) based on 100 parts of trimethylolpropanol acrylate was applied thereon to form a 2 μm thick overprint layer. And On this surface, at a position of 10 cm under an 80 W / cm mercury lamp, 2
The resultant was passed at a speed of m / min and irradiated with ultraviolet rays to cure the overprint layer. On the cured surface, a character pattern was screen-printed with a film thickness of 5 μm using a vinyl-based screen printing ink. After drying at 135 ° C. for 10 minutes, gelatin (manufactured by Nitta Gelatin Co.) was applied to a thickness of 20 μm, and after drying, immersed in a 5% aqueous solution of ammonium bichromate for 10 minutes.
Dry to form a volume hologram material layer. Thereafter, a volume hologram master was brought into close contact with this surface, and optical replication was performed using Ar laser light. After the development, an acrylic resin-based adhesive (Acrynal # 3000, acrylic resin, manufactured by Toei Kasei Co., Ltd.) was applied on the surface as an adhesive layer to a thickness of 5 μm to prepare a transfer sheet.

This sheet was placed on paper with the adhesive layer facing down, and heated and pressed from above at 170 ° C. under the condition of 50 kg / cm ² , the base film was peeled off, and the volume hologram layer was transferred to paper.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a volume hologram transfer sheet according to the present invention.

FIG. 2 is a sectional view showing an example of a volume hologram transfer sheet according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Volume hologram transfer sheet 2 Base film 3 Volume hologram layer 4 Adhesive layer 5 Release layer 6 Overprint layer 7 Printing ink layer

Claims (4)

(57) [Claims] A volume hologram layer and an adhesive layer are provided in this order on a substrate film to be peeled, and the adhesive layer contains a light-absorbing dye or pigment. , Volume hologram transfer sheet. 2. The volume hologram transfer sheet according to claim 1, wherein an overpurine and a layer are formed between the base film and the volume hologram. 3. The volume hologram transfer sheet according to claim 2, wherein a release layer is formed between the base film and the overprint layer. 4. The volume hologram transfer sheet according to claim 1, wherein a release layer is formed between the base film and the volume hologram layer.