KR100259122B1 - 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 comprises cellulose acetate and an acrylic resin, wherein an acrylic resin The content of is characterized in that 90 to 110% by weight based on cellulose acetate. The stamping foil of the present invention having such a release layer can be peeled off with a weak force to increase the work speed, and can obtain a good transfer surface in which the color and gloss of the colored layer is maintained as it is after cutting. (cutting property) is good, small letters can be transferred effectively.

Description

Stamping foil {STAMPING FOIL}

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

Stamping foil is used in the hot stamping process, which is a kind of dry printing method, and hot stamping process is applied to the transfer plate 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 is not separated from the metal layer.

In particular, the release layer should have a peeling force suitable for the intended use so as to be easily separated from the base film even with a small force, and cutting ability enough to effectively transfer small letters, and should also have good solvent resistance.

Usually, the release layer should have good solvent resistance and chemical resistance since it plays a surface protection role after stamping foil transfer. As satisfying these requirements, cellulose acetate has been mainly used as a release layer material, and in particular, melamine is used as a colored layer. In this case, cellulose acetate has been used alone.

However, the cellulose acetate has a problem that the peeling force of the release layer is greatly changed depending on the application amount thereof. Generally, it is preferable to adjust the coating amount of cellulose acetate within the range of about 0.1 ± 0.01 g / m 2, and if the coating amount is smaller than the above range, a strong adhesive force is formed between the base film and the colored layer, thereby releasing from the base film. It becomes difficult to peel off the layer. 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 the sex is not good.

The technical problem to be solved by the present invention is to provide a stamping foil that can reduce the peeling force, good cutting properties, and maintain the color and gloss of the colored layer as it is after transfer by changing the composition of the release layer to solve the above problems.

Technical problem of the present invention as described above, 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 comprises a cellulose acetate and an acrylic resin, The content of acrylic resin is achieved by stamping foils which are 90-110% by weight based on the total amount of cellulose acetate. This is because when the content of the acrylic resin is higher than that, peeling is difficult, and when it is below, the cutting property decreases.

In the stamping foil according to the present invention, the acrylic resin is particularly preferably a carboxylated acrylic acid copolymer having an acid value of 128-132, which is not dissolved in a solvent if the acid value of the acrylic resin is higher than that. It is because the adhesive force with a colored layer will weaken below it.

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

In the present invention, the glass transition temperature is relatively high, brittle, and by adding an acrylic resin having a high solvent resistance to the organic solvent, it not only compensates poor cutting property of cellulose acetate, but also the solvent resistance of the release layer composition itself. It can be improved.

Therefore, the release layer formed from the release layer composition of the present invention is excellent in cutting property, easy to peel off, and exhibits excellent solvent resistance, so the quality of the colored layer transferred after transfer 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 I-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 0.1 g / m 2 as dry weight, and then dried at 130 ° C. for 5 seconds to form a release layer.

Cellulose Acetate (CA, Kodak Chemicals) 1kg

0.9 kg of acrylic (surcol 441, manufactured by Allied Colloid)

Toluene 68.67kg

Methyl ethyl ketone 29.43 kg

Subsequently, a colored layer composition having the following composition was applied onto the release layer (coating amount: 1.2 g / m 2), and then dried at 180 ° C. for 10 seconds to form a colored layer.

Melamine resin (Clear 300, Hwashin Chemical) 10kg

Rosin (Clear 333, Hwashin Chemical) 25kg

Toluene 20kg

Methyl ethyl ketone 20 kg

Methanol 24 kg

1 kg of dye (Orange G)

Subsequently, aluminum was 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, a mixed resin of 40 wt% acrylic resin and 60 wt% vinyl resin was diluted with thaliol. This diluting solution was then applied onto the metal layer to form an adhesive layer to complete the stamping foil. The stamping foil was evaluated for the peeling level, post-transfer peeling state and cutting property in the following manner, and the results are shown in Table 1 below.

<Evaluation of Cutting>

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.

Grade 1: Letters less than 0.4 mm wide

Grade 2-3: 0.4 mm wide letters

Grades 4-5: Letters 0.6 mm wide

Grades 6-7: 0.8 mm wide text

Grades 8-9: letters 1 mm wide

Grade 10: letters larger than 1 mm in width

〈Evaluation of Peeling〉

The level of force required to remove the cellophane tape (1 cm) from the finished foil was quantified and evaluated in 10 steps.

1: no peeling

10: Easily peeled off with very weak force

<Evaluation of peeling state after transfer>

(Circle): Peeling is very easy. In other words, the transfer surface can be completely transferred easily

(Triangle | delta): Peeling is easy. In other words, transfer is done, but it takes some power when peeling

X: Peeling is difficult. That is, some non-transcriptional parts appear

Example I-2

A stamping foil was made in the same manner as in Example I-1 except that the coating composition for release layer was applied in an amount of 0.2 g / m 2, and the properties thereof were evaluated. The results are shown in Table 1 below. It was.

Example II-1

A stamping foil was made in the same manner as in Example I-1 except that the composition of the coating composition for the release layer was as follows, the properties thereof were evaluated, and the results are shown in Table 1 below.

Cellulose Acetate (CA, Kodak Chemicals) 1kg

Acrylic (surcol 441, Allied Colloid) 1kg

Toluene 68.6kg

Methyl ethyl ketone 29.4 kg

Example II-2

A stamping foil was made in the same manner as in Example II-2 except that the coating composition for release layer was applied in an amount of 0.2 g / m 2, and the properties thereof were evaluated. The results are shown in Table 1 below. It was.

Example III-1

A stamping foil was made in the same manner as in Example I-1 except that the composition of the coating composition for the release layer was as follows, the properties thereof were evaluated, and the results are shown in Table 1 below.

Cellulose Acetate (CA, Kodak Chemicals) 1kg

1.1 kg of acrylic (surcol 441, manufactured by Allied Colloid)

Toluene 68.5kg

Methyl ethyl ketone 29.4 kg

Example III-2

A stamping foil was made in the same manner as in Example III-2 except that the coating composition for release layer was applied in an amount of 0.2 g / m 2, and the properties thereof were evaluated. The results are shown in Table 1 below. It was.

Comparative Example I-1

A stamping foil was made in the same manner as in Example I-1 except that the composition of the coating composition for the release layer was as follows, the properties thereof were evaluated, and the results are shown in Table 1 below.

Cellulose Acetate (CA, Kodak Chemicals) 1kg

Toluene 69.3kg

Methyl ethyl ketone 29.7 kg

Comparative Example I-2

A stamping foil was made in the same manner as in Comparative Example I-1 except that the coating composition for release layer was applied in an amount of 0.2 g / m 2, and the properties thereof were evaluated. The results are shown in Table 1 below. It was.

Example I-1 Example I-2 Example II-1 Example II-2 Example III-1 Example III-2 Comparative Example I-1 Comparative Example I-2 Machinability 3 5 2 4 2 3 5 8 Peeling level 7 8 6 7 5 6 7 9 Peeling after transfer ○ ○ ○ ○ △ ○ ○ ○

From the results of Table 1, when the acrylic resin is added (Examples I to III), there is a large difference in the peeling level under the same conditions as the application amount of the release layer composition compared to the case of using only cellulose acetate alone (Comparative Example). Although, cutting property is remarkably good in the case of an Example.

On the other hand, when the acrylic resin is added (Examples I to III), it can be seen that when the acrylic amount is increased, the peeling level is lowered and the cutting property is increased as the amount of the acrylic addition is increased, thereby exhibiting the characteristics of effectively transferring small letters.

In the case of an Example or a comparative example, it turns out that the peeling state after transfer is generally favorable.

Stamping foil having a release layer according to the present invention can be easily peeled to increase the work speed, the transfer state is good even after the transfer to obtain a good transfer surface in which the color and gloss of the colored layer is maintained as well as cut By greatly improving the sex, small letters and the like can be effectively transferred, and the applicability thereof can be further expanded.

Claims (1)

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 release layer is formed of a composition comprising cellulose acetate and an acrylic resin, wherein the acrylic resin is an carboxylated acrylic acid copolymer having an acid value of 128-132, which includes 90-110% by weight based on the total amount of the cellulose acetate. Characterized by stamping foil.