KR19980026463A - Stamping foil - Google Patents

Abstract

The present invention relates to a stamping foil, wherein the release layer is formed of a mixture of cellulose acetate and an acrylic resin in a stamping foil in which a base film, a release layer, a colored layer, a metal deposition layer, and an adhesive layer are sequentially laminated. The stamping foil of the present invention has the advantage that the peeling force of the release layer is uniform throughout and the release layer has flexibility, so that it is flexibly deformed in the pattern shape of the colored layer during transfer.

Description

Stamping foil

The present invention relates to a stamping foil, and more particularly, to a stamping foil in which the peeling force is generally uniform and the flexibility of the release layer is significantly improved.

Stamping foil is used in a dry printing method, it is usually transferred by heat and pressure and can be roughly divided into paper, plastic, textile, leather, etc. according to the object to be transferred.

In order to perform the preferred dry printing process, it must be heat resistant to withstand the high temperature hot pressing process after the adhesive liquid coating process. In addition, when the desired pattern is transferred to a transfer object (paper, fiber, leather, etc.), the adhesion between the colored layer and the metal deposition layer should be excellent so that the colored layer does not separate from the metal deposition layer when the base film and the release layer are separated. On the other hand, the base film and the release layer should have a peel force suitable for the intended use to facilitate separation.

Therefore, as the release layer of the stamping foil, cellulose acetate having a very low bonding force with the base film is usually used. By the way, there is a problem that the change in the peel force of the release layer is very large according to the change in the coating amount of the cellulose acetate. 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 contrary, when the application amount of the cellulose acetate is applied in excess of an appropriate amount, 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, the release layer should be flexible enough to deform along the pattern shape of the colored layer during the transfer process. However, in the case of cellulose acetate, the release layer made therefrom lacks flexibility because it forms a rigid film in its own nature. In particular, as the thickness of the release layer becomes thicker, the problem due to the rigidity of the release layer becomes more serious, and thus the transfer process cannot be preferably performed.

The technical problem to be achieved by the present invention is to provide a stamping foil that is easier to control the coating amount and to provide flexibility in transfer while maintaining a predetermined peel force by changing the composition of the release layer.

An object of the present invention is a stamping foil in which a base film, a release layer, a coloring layer, a metal deposition layer, and an adhesive layer are sequentially laminated, wherein the release layer is formed of a mixture of cellulose acetate and an acrylic resin. Can be achieved.

In the stamping foil according to the present invention, the weight ratio of the cellulose acetate and the acrylic resin is preferably 100: 20 to 100: 60. In addition, it is preferable that the application amount of the said release layer is 0.1-0.3 g / m <2>.

In the stamping foil according to the present invention, since the acrylic resin has good adhesion to the base film, the peeling force does not change sensitively even if the coating amount is somewhat insufficient or increased, and also prevents the cellulose acetate from forming a hard film. At the time of transfer, the release layer can flexibly cause a shape change in the pattern shape of the colored layer.

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

Method of making stamping foil.

A 12 μm-thick polyethylene terephthalate film was prepared as a base film, and then a coating composition for a release layer having the following composition was prepared.

5% by weight cellulose acetate

1% by weight of acrylic resin (A-101)

Toluene 70% by weight

Methyl ethyl ketone 24% by weight

The coating composition was applied on a polyethylene terephthalate film and then dried to form a release layer having a coating amount of 0.1 g / m 2.

Next, a polyurethane resin (PL-50) and a dye (Blue GL, manufactured by Ciba-Geigy) (weight ratio: 95: 5) were dissolved in methyl ethyl ketone / toluene (2: 1) to give a resin concentration of 20%. The solution was prepared. The resulting solution was applied onto the release layer, dried and cured at 180 ° C. for 15 seconds to form a colored layer having a thickness of 1.0 μm.

Aluminum was vacuum deposited on the colored layer to form a metal deposition layer having a thickness of 0.02 μm.

Finally, 40% by weight of the acrylic resin and 60% by weight of the mixed resin of vinyl resin was diluted with thaliol, and then the diluted solution was applied onto the metal layer to form a stamping foil by forming an adhesive layer having a thickness of 1 μm.

Peel force measuring method

After attaching a 25 mm wide OPP (trade name: Circol) tape to the stamping foil made according to the method described above, the force applied when the tape and both ends of the stamping foil were separated by a peel force meter was measured. The measurement results are shown in Table 1 below.

Example 2

A stamping foil was prepared in the same manner as in Example 1 except that the coating amount of the release layer was 0.2 g / m 2, and the peeling force of the stamping foil was measured and the results are shown in Table 1 below.

Example 3

A stamping foil was prepared in the same manner as in Example 1 except that the coating amount of the release layer was 0.3 g / m 2, and the peeling force of the stamping foil was measured and the results are shown in Table 1 below.

Example 4

A stamping foil was prepared in the same manner as in Example 1 except that a coating composition for a release layer having a composition as follows was applied on a polyethylene terephthalate film and then dried to form a release layer having a coating amount of 0.1 g / m 2. , The peel force of the stamping foil was measured and the results are shown in Table 1 below.

5% by weight cellulose acetate

2% by weight of acrylic resin (A-101)

Toluene 70% by weight

Methyl ethyl ketone 23 wt%

Example 5

A stamping foil was prepared in the same manner as in Example 4 except that the coating amount of the release layer was 0.2 g / m 2, and the peeling force of the stamping foil was measured and the results are shown in Table 1 below.

Comparative Example 1

A stamping foil was prepared in the same manner as in Example 1 except that a release layer having a coating amount of 0.1 g / m 2 was formed using a coating composition for a release layer containing 15% of cellulose acetate, and the stamping foil was peeled off. Force is measured and the results are shown in Table 1 below.

Comparative Example 2

A stamping foil was prepared in the same manner as in Comparative Example 1 except that the coating amount of the release layer was 0.2 g / m 2, and the peeling force of the stamping foil was measured and the results are shown in Table 1 below.

TABLE 1

From the results of Table 1 above, when only cellulose acetate was used alone as the release layer (Comparative Examples 1 and 2), the peel force variation range was very wide as the coating amount, that is, the thickness of the release layer was changed. Therefore, it can be seen that it is difficult to finely control the coating amount due to the nature of the coating process, in which case it may cause a defect of the stamping foil.

On the other hand, in the case of using a mixture of cellulose acetate and an acrylic resin as the release layer (Examples 1 to 3, and Examples 4 and 5), even if the coating amount is slightly changed under the same conditions, the peeling accordingly The amount of change in force is not large. Therefore, it can be seen that the control of the coating amount, that is, the thickness control of the release layer is relatively easy as compared with the use of the conventional coating composition for release layer.

Since the stamping foil of the present invention has a uniform peeling force of the thickness of the release layer as a whole, and the release layer can be flexibly deformed to the pattern shape of the colored layer during transfer, no defect of the stamping foil is exhibited and the transfer process is also easily performed. There is an advantage.

Claims (6)

In a stamping foil in which a base film, a release layer, a colored layer, a metal deposition layer, and an adhesive layer are sequentially laminated, Stamping foil, characterized in that the release layer is formed of a mixture of cellulose acetate and acrylic resin. The stamping foil of claim 1, wherein the base film is a polyester film. The stamping foil of claim 2 wherein the polyester is polyethylene terephthalate. The stamping foil of claim 1, wherein the metal deposition layer is an aluminum layer. The stamping foil of claim 1, wherein the weight ratio of the cellulose acetate and the acrylic resin is 100: 20 to 100: 60. The stamping foil of claim 1, wherein the coating amount of the mixture is 0.1 to 0.3 g / m 2.