KR100258726B1 - Stamping foil - Google Patents

Abstract

The stamping foil of the present invention is a stamping foil in which a release layer, a colored layer, a metal deposition layer, and an adhesive layer are sequentially laminated on a base film, wherein the release layer is formed of a melamine resin and diethyl phosphate, and diethyl The content of phosphate is characterized in that 5 to 10% by weight based on the melamine resin. Therefore, the stamping foil of the present invention is excellent in heat resistance, the color and gloss of the colored layer after the transfer can be maintained as it is, and small letters and the like can also be transferred effectively.

Description

Stamping foil

The present invention relates to a stamping foil, and more particularly, to a hot stamping foil having excellent heat resistance and excellent retention of color and gloss of a colored layer after transfer.

Stamping foil is used for hot stamping process, a kind of dry printing method, and hot stamping process applies heated platen to transfer objects such as plastic, fiber, leather, etc. It is a process about a kind of heat printing method of pasting.

Therefore, stamping foils are usually transferred by heat and pressure, and are roughly classified into paper, plastic, fiber, leather, and the like depending on the object to be transferred.

A typical stamping foil has a structure in which a release layer, a coloring layer (or protective layer), a metal layer (or an aluminum layer) and an adhesive layer are sequentially formed on a base film, and the components, compositions and thicknesses of each layer are used. It may vary depending on the application.

In order for the stamping foil to be preferably used in a hot stamping process, first, it must have gloss, wear resistance, and chemical resistance, and second, have heat resistance to withstand high temperature heat and compression processes after the adhesive liquid application process, Third, in the process of transferring the desired pattern to a transfer object (paper, fiber, leather, etc.) and separating the base film and the release layer, the adhesion between these layers should be good so that the colored layer does not separate from the metal layer. The release layer should have a peel force suitable for the intended use for easy separation, and besides, it should have good solvent resistance.

The present invention is particularly intended to meet the above requirements with respect to release layers.

The release layer of stamping foil should have good solvent resistance and chemical resistance since it plays a surface protection role after stamping foil transfer. To satisfy these requirements, cellulose acetate has been commonly used as a release layer material, and melamine is used as a colored layer. In particular, cellulose acetate has been used alone.

However, the cellulose acetate has a problem that the peel force of the release layer is greatly changed depending on the amount of its application. In general, it is preferable to adjust the coating amount of the cellulose acetate within the range of 0.1 ± 0.01 g / ㎡, if the coating amount is smaller than the above range because a strong adhesive force is formed between the base film and the colored layer from the release film from the base film It becomes difficult to peel off. On the other hand, if the application amount of cellulose acetate is increased, there is a problem that the release layer is likely to spontaneously peel off during or before the transfer process.

Therefore, it is very important to properly control the coating amount of the cellulose acetate. As described above, since the coating amount control range is extremely limited, such as ± 0.01 g / m 2, it is very difficult to control the coating amount, and defects in the stamping foil may occur. Most likely. In addition, it is common to form a release layer as thick as possible in the above range in order to fully play a role as a release layer, in which case the cutting property is sharply dropped, it is difficult to transfer small letters, etc. The disadvantage is that it is not good. In addition, when cellulose acetate is used as a release layer material, the phenomenon which remains on a colored layer at the time of a transfer process may arise, and the color and gloss of a colored layer may change.

Technical problem to be solved by the present invention is to solve the above problems by changing the composition of the release layer can be effective even when using the melamine colored layer, the stamping can maintain the color and luster of the colored layer intact after transfer To provide the foil.

The technical problem of the present invention as described above is a stamping foil in which a release layer, a coloring layer, a metal deposition layer, and an adhesive layer are sequentially laminated on a base film, wherein the release layer is formed of melamine-based resin and diethyl phosphate. In addition, the content of diethyl phosphate is achieved by a stamping foil of 5 to 10% by weight based on the melamine-based resin.

Preferred as the melamine resin is urea-melamine resin.

It is preferable that the said colored layer is a melamine type colored layer.

The principle of the present invention is as follows.

When the melamine resin is used as a release layer material to form a hard coating film and the colorant is coated thereon, the bonding force between the melamine resin layer and the colorant is very weak and can be easily peeled off, and the melamine resin is thermally cured. If the solvent resistance and heat resistance is good, the choice of solvent is wide when coating the colored layer, and the stamping foil produced therefrom is excellent in heat resistance and is not affected by peelability even at high temperatures. In addition, in the case of using the melamine-based resin as the release layer material, only the colored layer is transferred during transfer and the release layer remains in the base film as it is, so that the color and gloss retention of the colored layer is very excellent.

Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not limited to this.

<Example 1>

A polyester film having a thickness of 12 μm was prepared as a base film, and then a coating composition for a release layer having the following composition was applied in an amount of 0.05 g / m ² as a dry weight and dried to form a release layer.

Melamine (Clear 300, Avatar) 1kg

Diethylene phosphate 0.1 kg

Methanol 30kg

Methyl ethyl ketone 68.9 kg

Subsequently, a melamine-based colored layer is formed on the release layer (1.2 g / m ² ), and aluminum is vacuum deposited on the colored layer according to a conventional method to form a metal deposition layer having a thickness of 0.02 μm, and finally acrylic The stamping foil was completed by diluting a mixed resin of 40% by weight resin and 60% by weight vinyl resin with thaliol, and then applying this dilution solution onto the metal layer to form an adhesive layer. The stamping foil was evaluated for cutting properties and thermal stability by the following method and the results are shown in Table 1 below.

〈Cutability evaluation〉

Using a stamping mold capable of evaluating the smallest letter of 1st grade and the largest letter of 10th grade, cutability was evaluated after the transfer process.

〈Thermal Stability Evaluation〉

The prepared stamping foil was heat-treated in an oven (180 ° C.) for 10 minutes and then peeled off with a cello tape to observe a change state at this time.

<Example 2>

A stamping foil was prepared in the same manner as in Example 1 except that 0.05 kg of diethyl phosphate and 69.4 kg of methyl ethyl ketone were used as the coating composition for the release layer, and the properties thereof were evaluated. .

<Comparative Example>

A stamping foil was prepared in the same manner as in Example 1 except that only 0.2 g / m ² of the release layer was formed using only cellulose acetate as a material of the coating composition for the release layer, and the results thereof were evaluated. 1 is shown.

division Example 1 Example 2 Comparative example Cutting property (grades 1-10) One 2 5 Thermal stability Peelable Peelable Cannot be peeled off

From the results of Table 1, when only cellulose acetate alone was used as the release layer material (Comparative Example), it was difficult to transfer small letters and poor thermal stability, resulting in poor peelability, but mixing melamine resin and diethyl phosphate. In the case where the composition for forming a release layer was prepared (Examples 1 and 2), the same problems as in Comparative Examples were solved, and it was found that peelability was good and transfer of small letters was possible.

In addition, visual observation of the color and gloss of the colored layer after transfer showed that both the color and the gloss remained almost intact in the case of the examples, but in the case of the comparative example, The gloss was somewhat changed.

Therefore, especially in the case of a stamping foil having a melamine-based colored layer, the release layer of the present invention is excellent in peelability and retaining effect of the colored layer after transfer, and can effectively transfer small letters and the like, thereby extending its application. have.

Claims (3)

In a stamping foil in which a release layer, a coloring layer, a metal deposition layer, and an adhesive layer are sequentially laminated on a base film, the release layer is formed of a melamine resin and diethyl phosphate, and the content of diethyl phosphate is melamine. Stamping foil, characterized in that 5 to 10% by weight based on the resin. The stamping foil of claim 1, wherein the melamine-based resin is a urea-melamine resin. The stamping foil of claim 1, wherein the colored layer is a melamine-based colored layer.