JPH04303881A - Hologram transfer foil - Google Patents

Abstract

PURPOSE:To make it possible to clearly read an image formed on a hologram by printing or other method by forming the hologram and a patterned hologram- free part for vanishing the metallic luster of a thin metal film present on the hologram on a hologram forming surface. CONSTITUTION:A releasing layer 13, a resin layer 14 with a relief type hologram formed on the surface, a thin metal film 15, a partially formed hard ink layer 16 contg. >=27wt.% pigment and a heat-sensitive adhesive 17 are successively laminated on one side of a substrate film 12 to obtain hologram transfer foil 1. Letters, figures, a pattern or mark formed with the hard ink shifts in the adhesive layer 17 against the resin layer 14 and the metal film 15 at the time of transfer and the ruggedness of the hologram on the ink layer 16 is damaged, accordingly an effect peculiar to the hologram is eliminated and the metallic luster of the metal film 15 on the hologram is vanished.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram transfer foil for forming a relief hologram by transfer, and more particularly to a hologram transfer foil that allows a hologram to partially disappear during hologram transfer.

0002

[Prior Art] Holograms have traditionally been used for the covers and illustrations of books and magazines, as well as for gift products and novelty products, making use of their decorative and unexpected three-dimensional effects. Securities, credit cards,
It is used as a means to prevent ID card forgery. Also advertising,
It is also used in the display field. These holograms have an uneven pattern of interference fringes formed on their surfaces, and when the surface is irradiated with white light, a reflected image with a three-dimensional effect is obtained because the reflection diffraction angle of the reflected light differs depending on the wavelength. , which is called a relief hologram. Furthermore, in addition to the unevenness that makes up the hologram on the resin surface, in order to make the hologram brighter, a metal vapor deposition layer is provided on the top surface, giving it the appearance of a rainbow pattern with metallic luster. , also called a rainbow hologram.

As a means for forming such a relief hologram, a transfer method is used in which a relief hologram formed on another support is transferred along with the support onto an object to be transferred via an adhesive. Many applications have been filed for such hologram transfer foils by the applicant, for example, Japanese Patent Publication No. 1-5
4709, Japanese Patent Publication No. 1-54710, Japanese Patent Application Laid-open No. 190369-1982, Japanese Patent Application Laid-Open No. 1988-208072
The structure is known as described in the above publication.

These hologram transfer foils are made by sequentially forming a resin layer on which a relief hologram is formed, a metal thin film layer, and a heat-sensitive adhesive layer on the surface of a support film. In order to protect unevenness and reproduce a sufficiently clear hologram image even after transfer, a two-component curing type urethane resin, for example, is used as the resin.

[0005]

[Problems to be Solved by the Invention] However, since relief type holograms are formed on the entire surface of the hologram forming body at the time of manufacture, there are areas where there is no hologram image in some parts of the hologram, for example, holograms in character shapes. It is difficult to provide a clear area, and it was also known that a visible image such as a printed image is formed between the support film and the hologram forming surface, but in reality, the hologram has a metallic luster as described above. Because of the rainbow pattern, visible images such as letters were not easy to see and difficult to read due to the reflected light from the hologram forming surface. Therefore, the present invention makes it possible to form a hologram-free part on a part of the hologram forming surface in order to eliminate the metallic luster of the hologram and the metal thin film layer on the upper surface, and further forms an image such as printing on the hologram. An object of the present invention is to provide a hologram transfer foil that can be clearly read in cases where the hologram transfer foil is clearly readable.

[0006]

[Means for Solving the Problems] The present invention, which has been made to achieve the above object, provides a resin layer with a relief hologram formed on the surface, a metal thin film layer, and a pigment partially formed on one side of a support film. A hard ink layer containing 7% by weight or more of
This is a hologram transfer foil made by sequentially laminating heat-sensitive adhesives. Furthermore, the hard ink layer is formed by forming patterns such as letters, numbers, patterns, and marks.

[0007]

[Operation] According to the present invention, patterns such as letters, numbers, patterns, marks, etc. formed with hard ink are pressed against the hologram resin layer and metal thin film layer of the hologram transfer foil during transfer, so that the hard ink Since the layer destroys the irregularities of the hologram on its upper surface, it is possible to eliminate the characteristic effects of the hologram and the resulting metallic luster.

[0008]

Embodiments Examples of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a sectional view schematically showing the structure of a hologram transfer foil of the present invention, and FIG. 2 is a sectional view schematically showing the state of a relief-type hologram after being transferred to a transfer target.

1 in the figure is a hologram transfer foil of the present invention, which includes a support film 11, a resin layer 14 with a hologram formed on one side of the support film 11, a metal thin film layer 15,
It is composed of a hard ink layer 16 and a heat-sensitive adhesive layer 17. Note that a release varnish layer is provided as a release layer 12 between the support film 11 and the resin layer 14 in order to improve the releasability between the support film 11 and the resin layer 14 on which a hologram is formed (hereinafter referred to as the resin layer). It is preferable to provide a pattern such as letters, numbers, marks, patterns, etc. as the printing ink layer 13.

As the support film 11, it can be said that polyester resin is most suitable as a well-known heat-resistant resin film due to its characteristics. The thickness of the support film 11 is 10 to 100 μm. Peeling layer 1
2 is preferably one that is easily peeled from the support film 11, such as a thermoplastic acrylic resin; a chlorinated rubber resin; or a mixture of this chlorinated rubber resin and nitrocellulose, acetylcellulose, cellulose acetate butyrate, polystyrene, or vinyl acetate chloride resin. It may be. In addition, thermosetting resins such as melamine resin, alkyd resin,
Epoxy resins, urea resins, etc. can also be used. The printing ink layer 13 can be formed by a well-known printing method such as ordinary gravure printing, and can print trademarks, logos, designs, etc. in the form of patterns such as letters, numbers, marks, and patterns in addition to holograms on the transfer target. The features of the present invention can be particularly utilized if the pattern structure is matched with the pattern structure of the foamed ink layer. The ink used for the printing ink layer 13 is used for the release layer 12 and the resin layer 1.
4 is desirable.

The resin layer 14 forms fine irregularities constituting a hologram on its surface, and is easy to form fine irregularities and has good reproducibility, and can also be formed on a support as a transfer foil. Therefore, in the previous application regarding hologram transfer foil, the applicant stated that a two-component curable urethane resin is preferable. , has disclosed research results regarding this.

More specifically, the two-component curable urethane resin is a polymer of a polyol and an isocyanate compound, and the polyol is an acrylic monomer whose glass transition temperature (TG) of a single aggregate is 80°C or higher and a polymer of a single aggregate of an acrylic monomer and an isocyanate compound. A reaction product of an acrylic monomer having a glass transition temperature (TG) of less than 80°C, the reaction product having a glass transition temperature (TG) of 7.
Acrylic polyols having a temperature of 0 to 100°C and an OH value of 25 to 150 are preferred. Examples of acrylic monomers having a glass transition point (TG) of a single aggregate of 80° C. or higher include methyl methacrylate, isopropyl methacrylate, and acrylonitrile. In addition, examples of acrylic monomers having a glass transition point (TG) of a single aggregate of less than 80°C include methyl acrylate, ethyl acrylate, n-butyl acrylate, isopropyl acrylate, 2-ethylhexyl acrylate, ethyl methacrylate, and n-butyl methacrylate. , isobutyl methacrylate, n-hexyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, and the like. Isocyanate compounds include toluene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, and the like.

[0013] A method for forming fine irregularities expressing a hologram on the resin layer 14 is known, and will be briefly explained as follows.
After coating the resin layer 14 on the support with the above-mentioned two-component curable urethane resin by a coating method such as a roll coating method or a plate coating method so that the dry film thickness is 0.5 to 5 μm, a hologram prepared in advance is formed. The resin layer 14 may be cured by aligning the stamper relief type hologram forming surfaces and pressing to copy the fine irregularities of the hologram stamper. The metal thin film layer 15 is provided to increase the amount of reflected light on the hologram surface formed on the resin layer 14 and make the hologram image clearer, and is formed along fine irregularities on the resin layer. It is necessary that vacuum evaporation method,
Al, gold, silver, tin, iron, copper, etc. and their alloys can be used by means such as sputtering and ion plating, and the film thickness is 100 to 10,000 Å (10 to 100 Å).
1000 nm) is appropriate.

The hard ink layer 16 is formed on the resin layer 14 and the metal thin film layer 15, and when it is transferred to an object to be transferred,
It does not soften due to heat and has enough strength to destroy the holograms on the metal thin film layer 15 and resin layer 14 in the softened thermosensitive recording layer 17, thereby causing cracks in the metal thin film layer 15. As a result, the hologram on the resin layer 14 is destroyed, and the metallic luster caused by the metal thin film layer 15 also disappears. Therefore, there is no hologram in the area where the foamed ink layer is formed, so if you form a pattern such as letters, numbers, marks, or patterns in that area,
The pattern appears to emerge within the hologram.

[0015] As such hard ink, one containing 7% by weight or more of pigment in the ink solid content can be used, and extender pigments such as silica and calcium carbonate are suitable as the pigment. In addition, as a resin binder, vinyl resin,
Acrylic resin, polyester resin, etc. are used. Furthermore, hard ink can be colored arbitrarily,
It can be obtained by adding pigments of the required color. The formation method is, for example, printing by gravure printing, but in order to sufficiently destroy the metal thin film layer 15 and the resin layer 14, it is desirable that the hard ink layer 16 has a thickness of 100 μm or more.

The heat-sensitive adhesive layer 17 is for adhering the resin layer 14 and below, in which a hologram has been formed from the hologram transfer foil, to the transferred object 2, and it softens at the same time as adhesion, so as not to destroy the hologram and the metal thin film layer. , heat activated adhesives are preferred and are therefore used. Heat-sensitive adhesives include polyester resin, acrylic resin, vinyl chloride resin, polyamide resin, polyvinyl acetate resin,
Thermoplastic resins such as rubber resins, ethylene-vinyl acetate copolymer resins, vinyl chloride acetate resins, etc. can be used, and the resins are arbitrarily selected in consideration of adhesion to the materials of the metal thin film layer 15 and the transfer target 2. It can be dissolved in a suitable solvent and applied to a dry film thickness of 1 to 20 μm by gravure coating, roll coating, blade coating, or other methods.

The hologram transfer foil 1 constructed as described above is bonded and supported by placing the surface on which the heat-sensitive adhesive layer 17 is formed on the transfer target 2 such as a card or sheet, and applying heat and pressure from the upper surface. The body film 11 is peeled off from the release layer 12, and a resin layer 14 having a hologram formed thereon is formed on the transfer target 2. Hard ink layer 16 at the same time as transfer
moves toward the hologram forming surface within the softened heat-sensitive adhesive layer 17 without being softened by the heat, destroying the hologram forming surface of the metal thin film layer 15 and resin layer 14, and causing cracks in the metal thin film layer 15. The hologram will become white, the hologram will be destroyed, and the metallic luster will also disappear. The transfer temperature is determined by the material of the heat-sensitive adhesive, and may be higher than the activation temperature at which the heat-sensitive adhesive softens.

[0018] The hard ink layer forms patterns such as letters, numbers, marks, and patterns, and when the hologram is transferred, it moves toward the support film in the softened heat-sensitive adhesive layer and the pattern swells. , the hologram and metallic luster disappear, the color becomes white, and the pattern becomes clearer. In addition, as mentioned earlier, if a pattern is formed that is the same as or larger than the image (pattern) of the printing layer arbitrarily formed on the hologram surface, the hard ink will move toward the support film side during hologram transfer. As a result, the pattern becomes raised, the hologram and metallic luster disappear, and the image (pattern) of the printed layer is emphasized due to the whitening, and the pattern is clearly expressed.

[0019] More specific examples will be given and explained. <Example> (1) The support film 11 is a polyester film with a thickness of 25 μm, and (2) the release layer 12 is formed by roll coating a coating liquid in which chlorinated rubber is dissolved in an appropriate solvent to a dry film thickness of 0. (3) The printing ink layer 13 is formed by gravure printing a group of characters expressing an appropriate expression using general-purpose gravure ink (three colors of yellow, magenta, and cyan), and (4) the resin layer 14 of,
Acrylic polyol
25.0% by weight
(Methyl methacrylate/2-hydroxyethyl methacrylate copolymer, TG75°C,
OH value 100) Nitrocellulose

5.0% by weight xylene diisocyanate
5.0% by weight toluene
25.0% by weight
isobutyl acetate
20
．． 0% by weight methyl ethyl ketone

A coating liquid having a composition of 20.0% by weight was formed to a dry film thickness of 1.0 μm by roll coating, and the hologram was placed on the relief-type hologram forming surface of a relief-type hologram stamper prepared in advance, and heated at 130°C. 40kg/
The hologram-forming surface was copied by heating and pressing under conditions of cm2.

(5) The metal thin film layer 15 is made of aluminum to a thickness of 500 Å (50 nm) by vacuum evaporation, and (6) the hard ink layer 16 is made of acrylic resin.
2
0.0% by weight Colored pigment (titanium oxide)

20.0% by weight silica (particle size 5-20μ
m)
35.0% by weight toluene

12.5% by weight ethyl acetate
A coating liquid having a composition of 12.5% by weight was formed by a gravure printing method into a rectangular shape located in or around the character group of the (3) printing ink layer to a dry film thickness of 10 μm, and (7) a thermosensitive layer. adhesive 17
is vinyl acetate resin
15
．． 0% by weight acrylic resin

10.0% by weight methyl ethyl ketone
38.0% by weight toluene
37.0% by weight
A coating liquid having the composition was formed by gravure coating to a dry film thickness of 3 μm,

The obtained hologram transfer foil was transferred onto (8) a hard polyvinyl chloride card by hot stamping at 150° C. for 0.5 seconds. The transferred hologram is beautifully and clearly reproduced on the card, except for the hard ink part, and the hard ink part rises slightly from the hologram surface, and the hologram and metallic luster disappear, becoming white and rising, and printing The characters in the ink layer could be clearly read.

[0022]

Effects of the Invention According to the present invention, patterns such as letters, numbers, patterns, marks, etc. formed partially with hard ink on the hologram resin layer and metal thin film layer of the hologram transfer foil. However, due to the softening of the heat-sensitive adhesive layer during transfer, the hard ink layer destroys the top surface of the hologram and the unevenness of the metal thin film layer, so the pattern area loses the unique effect of the hologram and the resulting metallic luster, making the pattern clearer. Can be read. Furthermore, by matching the pattern of characters or the like of the printing ink layer provided on the surface, the pattern of the printing ink layer can be emphasized and readable.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a hologram transfer foil of the present invention.

FIG. 2 is a cross-sectional view schematically showing the state of a relief-type hologram after the hologram transfer foil of the present invention is transferred to a transfer target.

[Explanation of symbols]

Claims (4)

[Claims] Claim 1: A resin layer with a relief hologram formed on its surface, a metal thin film layer, a partially formed hard ink layer containing 7% by weight or more of pigment, and a heat-sensitive adhesive are sequentially laminated on one side of a support film. A hologram transfer foil that is characterized by: 2. The hologram transfer foil according to claim 1, wherein the hard ink layer has a pattern such as letters, numbers, patterns, marks, etc. formed thereon. 3. The hologram transfer foil according to claim 1, wherein a pattern such as letters, numbers, patterns, marks, etc. is formed as a printing ink layer on the surface of the resin layer opposite to the surface on which the relief type hologram is formed. . 4. Characters formed as the printing ink layer;
The patterns such as numbers, patterns, marks, etc. are substantially the same as the patterns of letters, numbers, patterns, marks, etc. formed as the hard ink layer, and are provided at locations that appear to overlap in position. The hologram transfer foil according to claims 1 and 2.