KR100417831B1 - A print-through thin film having a dichromatic effect - Google Patents

Abstract

The present invention relates to a transfer thin film having a dichroic effect, and more particularly, to a transfer thin film having a dichroic effect which cannot be reproduced by a color copying machine or a scanner by viewing the front and side observation colors differently. . The transfer thin film according to the present invention is a transfer thin film comprising a base layer, a release layer, a protective layer, a metal layer, a colored layer and an adhesive layer, the optical density of the metal layer is 0.15 to 0.23, and thus the transfer thin film When transferred to the transferee, the color from the front and the 45-degree side are different from each other, and these films are applied to various products to apply to special products that require security as well as interesting visual effects. In this case, counterfeiting or tampering can be prevented.

Description

Transfer thin film having a dichromatic effect

The present invention relates to a transfer thin film having a dichroic effect, and more particularly, when the transfer color is transferred to a transfer object, the observed color of the front and side surfaces is different, and thus has a dichroic effect that cannot be reproduced by a color copying machine or a scanner. It relates to a transfer thin film.

The present invention belongs to the field of manufacturing a holographic film, such as a metal hologram, a metal oxide transparent hologram, and a gold foil, silver foil, colored film, which is made of a stamping foil and transferred to a transfer object.

Holograms create a special lattice on a thin film of metal or metal oxide in various directions, representing different colors depending on the angle seen by diffraction and interference of light. These holograms are distributed under trade names such as Excelgram, Kinegram, and Pixelgram, and each exhibits unique optical characteristics. The surface color of these holograms is colorless and transparent when using aluminum and metallic silver.

For example, as described in Korean Patent Publication Nos. 90-7156, 98-174100, 99-24748, and 99-65594, such holograms are stamped foils for transferring onto a transfer body, It is made of a sticker or the like, and generally has a structure in which a release layer, a protective layer, a metal layer, and an adhesive layer are sequentially stacked on a base film. Such a hologram cannot reproduce the gloss of metal and various colors of the hologram by a method such as color copying.

In addition, the gold foil film is mainly coated with copper powder, the silver foil film is mainly used as a wrapping paper or stamping foil by coating or vacuum deposition of aluminum powder. Such a gold foil and silver foil film is made of a stamping foil, a sticker, or the like in order to transfer to a transfer object, and generally has a structure in which a release layer, a protective layer, a metal layer, and an adhesive layer are sequentially stacked on a base film. Such gold foil and silver foil films exhibit metallic luster, and copiers cannot reproduce metallic luster.

The stamping foil adhesive composition, stickers, and the like can be found in Korean Patent Publication Nos. 88-1415, 94-4756, 98-38753 and Utility Model No. 108153. In addition, the method using the transcription has been applied to various fields, such as Korean Patent Publication No. 96-12433.

In addition, the colored film described in the Republic of Korea Patent Publication No. 98-85439 is used to manufacture high-quality wrapping paper by gravure coating or over-coating by disperse dyes and pigments in a glossy resin, and generally a simple colored layer or It has a structure in which a release layer, a protective layer, a colored layer, and an adhesive layer are laminated one by one. The colored film is colored gloss effect when attached or adhered to the adherend.

The present invention has a structure in which a base layer, a release layer, a protective layer, a metal layer, a colored layer, and an adhesive layer are sequentially stacked as a structure in which a structure of a conventional hologram and a colored film is combined, but a visual color effect shows a completely different feature. .

As a result, studies to show the dichroic effect different from the conventional hologram film and the colored film revealed that the optical density of the metal layer (metal deposition layer) may reflect dichroism by reflecting light in a specific region. Thus, the present invention has been completed.

Accordingly, an object of the present invention is to have a dichroism that is different from the color when viewed from the front side and the color when viewed on the transfer object is applied to a variety of products that require interesting visual effects as well as special security When applied to a product to provide a transfer thin film having a dichroic effect that can prevent forgery or tampering.

In the transfer thin film having a dichroic effect of the present invention for achieving the above object, in the transfer thin film comprising a base layer, a release layer, a protective layer, a metal layer, a colored layer and an adhesive layer, the metal layer has an optical density of 0.15 to Consisting of 0.23.

1 is a schematic diagram schematically showing the configuration of a transfer thin film.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

As can be seen in Figure 1, the structure of the transfer film or the thin film is composed of a plastic base layer, a release layer, a protective layer, a metal layer, or a colored layer, an adhesive layer or an adhesive layer, by adjusting the properties of each layer to vary A composition having a function is obtained.

First, in the present invention, the base layer serves to support a thin film exhibiting a dichroic effect, and mainly a plastic film is used. The material is preferably polyester, polypropylene, polyethylene terephthalate, etc. in consideration of physical and chemical properties. The thickness of the material is preferably around 10 microns in consideration of flexibility and transferability.

In addition, the release layer according to the present invention serves to easily separate the necessary portion of the thin film from the base layer, and is formed by coating and drying the release composition on one side of the base film, the components of the release layer is wax-based, cellulose Acrylic, silicone, fluorine resin and the like can be used. The release layer is formed by dissolving the resin alone or by mixing a solvent capable of dissolving the resin, and then dissolving the resin at an appropriate concentration so that the release layer is 0.1 to 2.0 microns using a gravure applicator or a similar coater. Coating. At this time, the solvent used uses what can melt | dissolve each resin. The protective layer serves to protect the surface of the transferred portion, is formed by coating and drying the protective composition on the release layer, the components of the protective layer is transparent melamine, acrylic, epoxy, urethane, cellulose nitrate, phenolic Resins and the like may be used alone or in combination. In addition, the protective layer is formed by dissolving the resin alone or by mixing a solvent capable of dissolving the resin, so that the protective layer is 0.3 to 3.0 microns using a gravure applicator, a similar coater, or the like at an appropriate concentration. Coating. At this time, the solvent used uses what can melt | dissolve each resin.

In this case, a method of coating a single layer by arbitrarily combining a release agent and a protective agent so as to simultaneously serve as a release layer and a protective layer may be used.

In this invention, application of a metal layer is an important factor in order to show a dichroic effect. The metal layer in the conventional transfer film or the like is opaque glossy (mirror) state by a lot of deposition, and the special embossing is used to manufacture the hologram, and for shading or tinting, the metal deposition layer is made very thin and passes some light. In other words, the metal layer deposited on the colored stamping foil or the metal hologram foil is in an opaque state because it is very thick and does not transmit light, and when the metal layer is thick, it has a silver-white metallic gloss effect. However, in general, when the metal layer is thin, light is transmitted to some extent and glossiness does not appear.

Thus, in order to manufacture the thin film which shows the gloss color and pearl color (rainbow color and multicolor) which are the dichroic effect of this invention, adjustment of the thickness of the metal deposited on a plastic base material becomes important.

The effective metal in the present invention may be aluminum, zinc, nickel, chromium, etc. which can be deposited under high vacuum, and when the metal layer is deposited to have an optical density of 0.15 to 0.23, the light transmittance is about 71% to 59%. In the range, a pearly effect appears. At this time, the proper optical density has many variables depending on the kind of metal to be used, the deposition temperature, the vacuum degree, and the moving speed of the deposited material, and thus, it is manufactured by adjusting the enemy properly.

At this time, the value of the optical density was measured using a Gretag D200 manufactured by the Swiss Gratag Company. When the metal layer in this range is composed of a base layer, a release layer, a protective layer, a metal layer, a colored layer, and an adhesive layer in sequence and transferred to the transfer target, the transferred portion appears in color by the colorant in the colored layer when viewed from the front, When viewed at a 45-degree angle, the brilliant pearlescent color (rainbow color, multicolor effect) is observed by the optical characteristics of the metal thin film layer. However, when the optical density is less than 0.15, the luster pearl color visible at the 45 degree angle disappears, and when the optical density is around 0.23 or more, the luster pearl color seen at the 45 degree angle disappears and starts to exhibit the mirror effect of the metallic luster.

The composition of the colored layer is usually made of a resin, a colorant, a solvent, the coating of the colored layer is a conventional method of coating the entire surface in a single color, as well as a multicolor gravure printing method that can exhibit a specific pattern and pattern to maximize the multicolor effect. effective. The method of putting a coloring agent in an adhesive layer and unifying a colored layer and an adhesive layer is also effective.

Although the composition of the adhesive layer is not different from the prior art, a thermosetting hot malt resin is preferable for transferring or stamping the thin film, and overcoating the entire surface of the thin film. In order to transfer the thin film to the transfer target, it is common to transfer heat by applying heat from a stamping machine to a working die such as specific letters, numbers, patterns, and marks.

In the present invention, as well as the over-coating method of the adhesive, the inverse method of transferring only the portion treated with the adhesive during thermal transfer by printing or coating the adhesive layer itself with specific letters, numbers, patterns, marks and the like is also preferable.

The dichroic effect thin film of the present invention may be composed of a base layer, a release layer, a protective layer, a metal layer, a colored layer, an adhesive layer or a composite layer in which the functions of the release layer and the protective layer, the colored layer and the adhesive layer are combined.

Hereinafter, the present invention will be described in more detail, but the scope of the present invention is not limited thereto.

(Example 1)

As a base layer, a cellulose-based resin solution was coated on a polyethylene terephthalate film to form a release layer of about 0.2 micron, and a protective layer of about 0.5 micron was formed on the release layer by using a urethane resin. On the film on which the release layer and the protective layer were formed, the metal thin film layer was formed by adjusting the deposition thickness so that the optical density became 0.19 using aluminum. A colorant composed of a blue phthalocyanine blue pigment and an acrylic resin was placed on the metal layer by using a gravure printing machine so that the colored layer was about 2 microns. The thin film of the dichroic effect was produced.

The thin film layer was transferred to the paper in a specific shape using a stamping machine, and the transferred thin film appeared grayish blue in which the blue colored layer of phthalocyanine blue and the light gray layer of the aluminum thin film were combined at the front and about 45 degrees. In, it was confirmed that the pearlescent color of gloss was seen by the light reflection characteristic of the aluminum thin film.

(Example 2)

The colored layer was carried out in the same manner as in Example 1 except that black carbon was used instead of the blue pigment of phthalocyanine blue, and the transferred thin film appeared black at the front and shiny pearl color at about 45 degrees.

(Example 3)

The same procedure as in Example 1 was carried out except that the adhesive was printed such that a specific pattern was formed by adding about 3% of an oil-soluble red dye to the urethane resin constituting the adhesive instead of the colored layer. When heat and pressure were applied, only the specific pattern treated with the adhesive had an effect of transferring to the transfer object, and the transparency was improved than when the pigment was used.

(Example 4)

Except for omitting the colored layer was carried out in the same manner as in Example 1, the thin film produced is a light gray color by the aluminum thin film on the front, shiny pearl color is visible at about 45 degrees.

As can be seen through the embodiment, the dichroic effect thin film of the present invention is composed of a base layer, a release layer, a protective layer, a metal layer, a colored layer, an adhesive layer or a release layer and a protective layer, a colored layer and an adhesive layer When a film made of a composite layer of combined functions is transferred to a transfer member using a stamping machine, the color of the film is colored by the colorant and the aluminum thin film on the front side, and the gloss rainbow color is formed by the light reflection characteristic of the aluminum thin film at about 45 degrees. see.

In addition, the composition is manufactured in the form of a thin film can be applied to a variety of products, such as stamping, stickers, toys, printed materials to obtain an interesting visual effect, and also important documents, passports, checks, stamps, etc. When applied to special products such as bonds, counterfeiting or tampering can be prevented.

Such a thin film film having a dichroic effect according to the present invention has a dichroic effect that is different from the aluminum thin film hologram, the metal oxide thin film hologram, and is copied from a color printer, a color copying machine, or a black and white copying machine. Possible colors are not reproduced. Therefore, they can be applied to various products such as toys and printed materials to obtain interesting visual effects, and also to prevent forgery or alteration when applied to special products such as important documents, passports, checks, bonds and bonds that require security. It can be used as a functional element.

Claims (5)

A transfer thin film comprising a base material layer, a release layer, a protective layer, a metal layer, a colored layer, and an adhesive layer, wherein the optical density of the metal layer is 0.15 to 0.23. The transfer thin film of claim 1, wherein the metal layer is selected from the group consisting of aluminum, zinc, nickel, and chromium. The transfer thin film according to claim 1, wherein the release layer and the protective layer are composed of a composite single layer. The transfer thin film according to claim 1, wherein the colored layer and the adhesive layer are composed of a composite single layer. A transfer thin film comprising a base layer, a release layer, a protective layer, a metal layer, and an adhesive layer, wherein the optical density of the metal layer is 0.15 to 0.23.