KR100319232B1 - 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 coated with 0.05 to 0.5 g / m ² of epoxy melamine. It is characterized in that it is formed, and the cutting property is good, small letters and the like can be transferred effectively, and the heat resistance and peelability of the release layer is also good.

Description

Stamping foil

The present invention relates to a stamping foil, and more particularly to a hot stamping foil with improved cutting properties.

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.

Since the release layer of the stamping foil has a surface protection role after the stamping foil transfer, solvent resistance and chemical resistance should be good, and cellulose acetate has been commonly used to satisfy these requirements.

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 cellulose acetate within the range of 0.1 ± 0.01 g / ㎡, if the coating amount is smaller than the above range, since a strong adhesive force is formed between the base film and the colored layer is formed 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, the coating amount control is quite difficult, and the occurrence of defects in the stamping foil is likely to occur. In addition, it is common to form the release layer as thick as possible in the above range in order to fully play a role as a release layer, in this case, the cutting (cutting) is sharply difficult to transfer small letters, etc., and also scratch resistance The disadvantage is that it is not good.

In addition, the release layer should be flexible enough to be deformed along the pattern shape of the colored layer during the transfer process. In the case of cellulose acetate, the release layer formed therefrom lacks flexibility because it forms a rigid film in its own nature. Do. 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.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a stamping foil having improved cutting property while maintaining a predetermined peeling force by changing a composition of a release layer in order to solve the above problems.

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 0.05 to 0.5 g / m ² of epoxy melamine. It is achieved by a stamping foil, characterized in that applied and formed.

In the present invention, epoxy melamine is used as a release layer forming material. When epoxy melamine is applied and cured on a base film, a hard coating film is formed, and when a grafting layer is formed therebetween, the epoxy melamine is separated between a release layer made of epoxy melamine and a colored layer. Is taking advantage of properties that can easily happen. In other words, when the epoxy melamine resin is cured to form a hard coating film, only the colored layer is transferred during the transfer and there is no reduction in cutting property due to the release layer. Curing is accomplished by treatment at about 150-190 ° C. for 5-30 seconds. Since the release layer also affects the cutting property during transfer, the role of the release layer is also important. Since wax or cellulose is formed in a structure in which the release layer and the colored layer are attached, the cutting property of the release layer during transfer also affects the overall cutting property. I can only give. However, in the present invention, since the curable mold release method is adopted, the heat resistance of the release layer is good, and even when the curing layer is cured for a long time at a high temperature at the time of curing the colored layer, the peelability is not affected. Since the layer does not remain, the inherent gloss of the colored layer is not lost by the release layer, so there is no problem of gloss reduction.

In the release layer of the stamping foil according to the present invention, it is preferable that the coating amount of epoxy melamine is 0.05-0.5 g / m ² , but when the coating amount is less than this range, a large force must be applied for peeling, and the coating amount is in the above range. If exceeding, peeling occurs so easily that the release layer may be removed during the storage, transportation or storage of the stamping foil.

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>

After preparing a polyester film having a thickness of 12 μm as a base film, the coating composition for a release layer having the following composition was coated with gravure roll in an amount of 0.05 g / m ² as a dry weight and dried at 180 ° C. for about 10 seconds to prepare a release layer. Formed.

2 parts by weight of epoxy melamine (KPT 8018, construction chemical)

Toluene 50 parts by weight

48 parts by weight of methanol

Next, 10 parts by weight of melamine resin (Clear 300, Hwashin Chemical), 25 parts by weight of rosin (Clear 333, Hwashin Chemical), 20 parts by weight of toluene, 20 parts by weight of methyl ethyl ketone, 24 parts by weight of methanol and dyes (Orange G, Ciba) Kigi Co.) 1 part by weight of the colored layer composition was applied on the release layer at a dry weight of 1.2 g / m ² , and dried and cured at 180 ° C. for 10 seconds to form a colored layer. Aluminum was vacuum-deposited on the colored layer to form a metal deposition layer having a thickness of 0.02 μm, and finally, a mixed adhesive solution of acrylic resin and vinyl resin was applied to form an adhesive layer, thereby completing a stamping foil. Various characteristics of this stamping foil were evaluated by the following method, and the results are shown in Table 1 below.

<Evaluation of cutting property>

Using a stamping mold capable of evaluating the smallest letter of the first grade and the largest letter of the tenth grade, the cutting property was evaluated after the transfer process. The following criteria were set for each class.

Letter transfer less than 0.4mm wide: Class 1

0.4mm wide Letter Transfer: Grade 2-3

0.6mm wide letter transfer: 4-5 grade

0.8mm width transcription: grades 6-7

1mm wide transcription: 8-9 grade

Transcription of 1mm or more in width: Grade 10

<Peelability Evaluation>

Cello tape (1 cm) was attached to the finished foil, and the force taken when peeling it back was measured to rank 1 to 10. When the peeling is not evaluated as a grade 1, and the peeling with a very weak force was evaluated as a 10 grade, if the peeling is possible with a weak force is very advantageous for high-speed stamping work. In addition, the peelability after transfer was also evaluated. When the peeling was performed with a very weak force, ○, the case where the transfer was performed but the force was required at the time of peeling was evaluated.

<Evaluation of heat resistance of release layer>

The finished foil was left to stand in a 180 degreeC oven for 1 minute, and the peelability at the time of peeling was measured. When there was no change in the grade of peelability, it was evaluated as good.

<Gloss measurement>

After the transfer, the transfer surface was visually observed and evaluated relatively in 3 grades (good, normal and poor were indicated by ○, Δ, and ×, respectively).

<Example 2>

Except that the coating amount for forming the release layer to 0.1g / m ² was prepared in the same manner as in Example 1 to measure the properties and the results are shown in Table 1 below.

<Example 3>

Except that the coating amount for forming the release layer was 0.3g / m ² to prepare a foil in the same manner as in Example 1 to measure the properties and the results are shown in Table 1 below.

<Example 4>

Except that the coating amount for forming the release layer to 0.5g / m ² was prepared in the same manner as in Example 1 to measure the properties and then the results are shown in Table 1 below.

<Example 5>

Except that the coating amount for forming the release layer was 0.7g / m ² to prepare a foil in the same manner as in Example 1 to measure the properties and the results are shown in Table 1 below.

<Comparative Example 1>

In the same manner as in Example 1, except that a solution containing 1 part by weight of cellulose acetate (CA, Kodak Chemicals), 70 parts by weight of toluene, and 29% by weight of methyl ethyl ketone was used as the composition for forming a release layer of Example 1. After the foil was prepared and its properties were measured, the results are shown in Table 1 below.

<Comparative Example 2>

Except that the coating amount for forming the release layer to 0.2g / m ² was prepared in the same manner as in Comparative Example 1 to measure the properties and the results are shown in Table 1 below.

<Comparative Example 3>

In Example 1, 10 parts by weight of isocyanate (TR50, Aekyung Chemical) was used as a colored layer composition, using 0.2 part by weight of ester wax (OP wax), 70 parts by weight of toluene, and 29.8 parts by weight of methyl ethyl ketone. , Diallyl phthalate (DAP, control chemical) 10 parts by weight, nitrocellulose (NC, unemulsified) 5 parts by weight, methyl ethyl ketone 54 parts by weight, cyclohexanone 20 parts by weight and dyes (Orange G, Ciba-Gaiyi Co., Ltd.) 1 Except for using the solution in parts by weight, a foil was prepared in the same manner as in Example 1, the properties thereof were measured, and the results are shown in Table 1 below.

Example number One 2 3 4 5 Comparison 1 Comparison 2 Comparison 3 Peelability 5 7 8 10 10 6 9 7 Cutting property One One 2 3 5 3 8 3 Release layer heat resistance Good Good Good Good Good Good Good Bad Peeling after transcription ○ ○ ○ ○ ○ △ △ ○

As can be seen from the results of Table 1, when only cellulose acetate alone was used as the release layer material (Comparative Example 1), the peelability was not very good, the glossiness was not good, and the wax material was used. The release layer heat resistance was poor. However, when the release layer was formed using epoxy melamine (Examples 1 to 5), all properties were generally maintained at a satisfactory level, and as the coating amount was increased, the peelability was improved, and even when the peelability was somewhat inferior, cutting The castle was very good. In addition, both release layer heat resistance and gloss were found to be good.

The stamping foil of the present invention can effectively transfer small letters and the like, as compared to using only cellulose acetate or wax-based material as the release layer material, the heat resistance of the release layer is greatly improved and the peelability is very good, and thus the applicability thereof can be further expanded. have.

Claims (1)

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 by applying 0.05 to 0.5 g / m ² of epoxy melamine. .