KR100852131B1 - Stamping foil - Google Patents

Abstract

The present invention relates to a stamping foil, stamping foil laminated on the base film including a release layer, a colored layer, a holographic stamp layer and a deposition layer, stamping characterized in that the following equations (1) and (2) By providing the foil, the release force can be properly adjusted to print well, and the shim is not contaminated, thereby maximizing the hologram effect.

<Equation 1>

5 g _f / 25 mm ≤ AB ≤ 18 g _f / 25 mm

In the above formula, A is the release force measured after laminating the release layer and the colored layer on the base film, and B is the release force of the final stamping foil.

<Equation 2>

1.5 g _f / 25 mm ≤ B ≤ 5 g _f / 25 mm

Where B is the release force of the final stamping foil.

Stamping foil, release force, hologram, printability

Description

Stamping foil

The present invention relates to stamping foils.

Stamping foil is a type of printing medium that transfers letters or patterns by giving heat and pressure to the adherend by dry printing method, and it is generally made by sequentially laminating a release layer, a colored layer, a holographic engraving layer, and a deposition layer on a base film. to be.

Recently, holographic stamping foils have been applied to various types of prints for the sake of security and design clarity. The patterns are also diverse, such as rainbow shapes and broken glass windows.

To this end, the holographic pattern can be visually observed by engraving the colored layer or the deposition layer. Therefore, after the engraving is performed on the colored layer, the deposition is performed or the film is formed after the deposition.

In order to display the hologram effect uniformly on the adherend, a stamping process using shims is currently applied, and the composition of the release layer and the colored layer laminated on the base film by the roll-to-roll method at a high temperature is a shim ( The design of the shim is transferred as it is, showing the hologram effect. If the proper colored layer composition and the release layer composition are not applied, the expensive shim may be contaminated during the engraving process to shorten the use cycle or the hologram effect after the engraving. It may cause problems such as not appearing clearly. Therefore, it is necessary to develop a release layer composition and a colored layer composition that produce a clear hologram effect without shim contamination even at high temperature engraving, but such development is insufficient.

Korean Patent Laid-Open Publication No. 1999-56340, Korean Patent Laid-Open Publication No. 1999-61725 and Korean Laid-Open Patent Publication No. 1999-30661 describe an improved release layer composition or colored layer composition for stamping foil, but the main improvement characteristics are released. In order to supplement cutting property, scratch resistance, solvent resistance, and abrasion resistance while lowering the force, it has many limitations in applying the composition of the release layer and the colored layer to the stamping foil for the hologram, so There are disadvantages such as contamination of shim) and incomplete hologram engraving effect.

Accordingly, the present inventors have studied to improve the above problems, and after the release force and hologram engraving process in the state of forming the release layer and the colored layer, the release force in the final product is properly adjusted to shim. It is possible to maximize the hologram effect to solve the contamination problem of the), it was confirmed that the stamping foil with good printability of the final stamping foil after the holographic stamping process can be prepared and completed the present invention.

Therefore, an object of the present invention is to provide a stamping foil that can control the release force during the high-temperature stamping process to minimize the contamination of the shim for stamping to maximize the hologram effect.

It is also an object of the present invention to provide a stamping foil having good printability in a final product in which the hologram is inscribed.

The present invention for achieving the above object in the stamping foil laminated on a base film including a release layer, a colored layer, a holographic stamp layer and a deposition layer, characterized in that the following formula 1 and 2 Provide stamping foil.

<Equation 1>

5 g _f / 25 mm ≤ AB ≤ 18 g _f / 25 mm

In the above formula, A is the release force measured after laminating the release layer and the colored layer on the base film, and B is the release force of the final stamping foil.

<Equation 2>

1.5 g _f / 25 mm ≤ B ≤ 5 g _f / 25 mm

Where B is the release force of the final stamping foil.

The base film is characterized in that the thickness of 12 ~ 20㎛ single layer or multilayer structure.

The release layer is an acrylic resin, a polyethylene resin and a cellulose derivative as a main component, and the acrylic resin is characterized in that it comprises 50 to 80% by weight relative to the total solid weight of the composition constituting the release layer.

The colored layer comprises an acrylic resin and a cellulose derivative, wherein the acrylic resin is characterized in that it comprises 10 to 50% by weight based on the total solid weight in the composition constituting the colored layer.

The deposition layer is characterized in that the thickness is 100 ~ 400Å.

Hereinafter, the present invention will be described in more detail.

The present invention provides a stamping foil characterized by satisfying the following equations (1) and (2) in a stamping foil laminated on a base film including a release layer, a colored layer, a holographic engraving layer, and a deposition layer.

<Equation 1>

5 g _f / 25 mm ≤ AB ≤ 18 g _f / 25 mm

In the above formula, A is the release force measured after laminating the release layer and the colored layer on the base film, and B is the release force of the final stamping foil.

<Equation 2>

1.5 g _f / 25 mm ≤ B ≤ 5 g _f / 25 mm

Where B is the release force of the final stamping foil.

If (AB) value is less than 5g _f / 25㎜, the shim is contaminated during the engraving process using shim, and (AB) value is more than 18g _f / 25㎜ coating of colored layer and release layer There is a disadvantage in that it is difficult to apply a stamping foil product due to poor properties.

And if the value of B is less than 1.5g _f / 25㎜, the release force is too small, there is a disadvantage that the cutting ability at high-speed stamping disadvantage, and if the value of B is more than 5g _f / 25㎜ the cutting property is good at high-speed stamping but the transferability is disadvantageous It has its drawbacks.

A polyester film or a polypropylene film can be used as the base film, and a single layer and a multilayer structure are included, and the thickness is preferably 12 to 20 μm.

The release layer is mainly composed of acrylic resin, polyethylene resin and cellulose derivative, and the acrylic resin preferably contains 50 to 80% by weight based on the total weight of solids in the composition constituting the release layer. If less than 50% by weight relative to the total solids weight of the layer-forming composition there is a problem that the shim (shim) at the time of high temperature engraving is contaminated.

The acrylic resin has a characteristic of being transparent and having low glossiness, and having good wear resistance, alcohol resistance, and the like. Polymethyl methacrylate, acryl polyol and acryl polyol polyester may be used at least one selected from copolymers, with polymethyl methacrylate being particularly preferred.

Polyethylene resin is added to the acrylic resin to increase the slip resistance serves to improve the scratch resistance. The content of the polyethylene resin is preferably 10 to 20% by weight based on the total solids weight in the composition for forming a release layer.

In addition, the cellulose derivative serves to lower the release force, and at least one selected from cellulose acetate, cellulose acetate butylate, cellulose acetate propylate, and nitro cellulose may be used. The content of the cellulose derivative is preferably 10 to 30% by weight.

It is preferable that the thickness of a mold release layer is 0.1-0.3 micrometers. If the thickness is less than 0.1㎛, the function of protecting the stamping foil is weak, and if it exceeds 0.3㎛, the protection function of the stamping foil does not increase more than a certain level, which is uneconomical. The release layer is formed through a drying process for 3 seconds to 15 seconds at 120 ~ 150 ℃ after applying the composition for forming a release layer.

The colored layer includes an acrylic resin and a cellulose derivative, and may include polyisocyanate as necessary. Polyisocyanate improves cleavability and prevents shim contamination, and its content is preferably 10 to 40% by weight. If the content is less than 10% by weight, the effect is insignificant, if more than 40% by weight is the cause of the physical properties of the colored layer.

The acrylic resin is preferably contained 10 to 50% by weight relative to the total solids weight of the composition constituting the colored layer, when the content of the acrylic resin is more than 50% by weight relative to the total solids weight of the composition constituting the colored layer. There is a problem that shim is contaminated during high temperature engraving.

Acrylic resin and cellulose derivative which can be used are as having demonstrated in the said release layer. The content of the cellulose derivative in the colored layer is preferably 20 to 80% by weight based on the total solids content in the colored layer forming composition.

It is preferable that the thickness of a colored layer is 0.6-2.0 micrometers. If the thickness is less than 0.6 mu m, there is a problem in the peeling characteristic, and if the thickness is more than 2.0 mu m, there is a problem of poor cutting property. The colored layer is formed through a drying process for 3 seconds to 15 seconds at 120 ~ 150 ℃ after applying the composition for forming a colored layer.

Thereafter, the engraving process may be performed and a deposition layer may be formed, or after the deposition layer is formed, the engraving process may be performed.

The engraving process is preferably carried out at 140 ~ 190 ℃. When the engraving process is performed below 140 ° C., the hologram effect does not appear clearly, and when the engraving process is performed at a temperature exceeding 190 ° C., there is a problem of causing deformation of the base film.

As the metal used for the deposition layer, it is preferable to use at least one selected from aluminum, chromium and gold. The thickness of the deposited layer is preferably 100 ~ 400 100, the disadvantage of gloss when the thickness of the deposited layer is less than 100Å, and disadvantageous in terms of cutting properties of the final stamping foil when the thickness of the deposited layer exceeds 400Å.

The stamping foil of the present invention may further form an adhesive layer having an adhesive function with the substrate on the deposition layer, the composition for forming the adhesive layer is an acrylic resin, glominated polyolefin, polyvinyl chloride, polyvinyl acetate, polyvinyl buty Ral and polyvinylacetate polyvinyl chloride copolymer comprising a resin selected from the silica particles and the silica, the thickness is preferably 0.8 ~ 2.5㎛.

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

Evaluation method of the film used in the present invention is as follows.

(1) release force

The Nitto 31B tape was laminated on a film to be used as a sample using a 5 kg rubber roller at 25 ° C. and 50% RH, and then the sample was cut into a size of 2.54 cm × 18 cm, followed by 25 ° C. and 50% RH for 24 hours. Stored at. After 24 hours, the Nitto tape was clamped on the upper load cell and the polyester film was clamped on the lower load cell using an universal testing machine (INSTRON), and then a T-type peeling test was performed at a speed of 300 mm / min. When peeled off, the tail that was not bitten by the load cell was kept horizontal until the test was completed.

(2) Evaluation of contamination level of stamp shim

After removing at least 10,000M by the roll-to-roll method, the shim was separated to visually evaluate the degree of contamination of the shim. If the result of the visual evaluation was not contaminated, the result was evaluated as pass.

(3) printability evaluation

Printability is evaluated based on the degree of transfer by stamping at a temperature of 100-120 ° C. using an up-down stamping machine. When the width of 1 mm was clearly transferred without flakes, the result was evaluated as passing.

<Examples 1-5 and Comparative Examples 1 and 2>

A stamping foil was prepared with the composition shown in Table 1 below, and the prepared method was as follows.

The composition for forming a release layer was applied on a base film having a thickness of 16 μm so as to have a thickness of 0.2 μm after drying, followed by hot air drying at 120 ° C. for 10 seconds to form a release layer. On the mold release layer, the composition for colored layer formation was apply | coated so that the thickness after drying might be 0.2 micrometer, and hot air dried at 120 degreeC for 10 second, and the colored layer was formed. After the engraving process was carried out at 170 ℃, the aluminum deposition layer was formed using a vacuum mounting method. Then, the composition for forming an adhesive layer was applied to a thickness of 1.5 μm and dried by hot air at 120 ° C. for 10 seconds to form an adhesive layer.

The stamping foil thus prepared was evaluated for release force, shim contamination, and printability as described above, and the results are shown in Table 2 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Base Film Polyester film, 16 μm thick Release layer Acrylic resin (wt%) Acrylic Resin A 70 Acrylic Resin A 60 Acrylic Resin A 70 Acrylic Resin A 70 Acrylic Resin A 70 Acrylic Resin A 30 Acrylic Resin A 70 Cellulose derivative (wt%) 20 30 20 20 20 60 20 Polyethylene (% by weight) Polyethylene Wax 10 Polyethylene Wax 10 Polyethylene Wax 10 Polyethylene Wax 10 Polyethylene Wax 10 Polyethylene Wax 10 Polyethylene Wax 10 Thickness (㎛) 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Colored layer Acrylic resin (wt%) Acrylic resin B 30 Acrylic resin B 30 Acrylic Resin B 40 Acrylic Resin C 40 Acrylic Resin C 30 Acrylic resin B 30 Acrylic Resin B 70 Cellulose derivative (wt%) 70 70 60 20 40 70 30 Polyisocyanate (% by weight) - - - 40 30 - - Aluminum deposition thickness 300 300 300 300 300 300 300 Adhesive layer CI-PP (% by weight) 30 30 30 30 30 30 30 Acrylic resin (wt%) Acrylic resin B 60 Acrylic resin B 60 Acrylic resin B 60 Acrylic resin B 60 Acrylic resin B 60 Acrylic resin B 60 Acrylic resin B 60 Silica particles (wt%) 10 10 10 10 10 10 10 Stamping temperature (℃) 170 170 170 170 170 170 170 * Polyester Film: Kolon * Acrylic Resin A: Degussa, B66 * Acrylic Resin B: Aekyung Chem A-111-50 * Acrylic Resin C: Aekyung Chem 52-666 * Cellulose Derivative: Eastman, CAB381-0.1 * Polyethylene Wax: Chopster * Chlorinated Polypropylene: Superchon 773H * Polyisocyanate: Aekyung Chemical, DN980

division Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Release force (g _f / 25㎜) A 21 15 15 17 12 6 31 B 4 2 5 4 3 4 3 A-B 17 13 10 13 9 2 28 Rest contamination pass pass pass pass pass fail fail Printability pass pass pass pass pass fail fail * A: Release force after laminating to release layer and colored layer on base film * B: Release force after all processes

The evaluation results, the embodiment of the difference between the releasing layer and the colored layer after the lamination to the release force and the release force after passing the whole process on the base material film present 5g _f / _f 25㎜ more than 18g / 25㎜ less invention are restless It is seen that the shim is not contaminated and the printability is excellent.

Therefore, the release force is appropriate to print well, the shim (shim) can be seen that the hologram effect can be maximized.

As described above, the present invention can solve the problem of contamination of shim by appropriately adjusting the release force in the final product after the release force and hologram engraving process in the state of forming the release layer and the colored layer. It is possible to provide a stamping foil to maximize the hologram effect.

The present invention can also provide a stamping foil having good printability of the final stamping foil which has undergone the hologram engraving process.

Claims (5)

In the stamping foil laminated on the base film including a release layer, a colored layer, a holographic stamp layer and a deposition layer, Stamping foil, characterized by satisfying the following equations (1) and (2). <Equation 1> 5 g _f / 25 mm ≤ AB ≤ 18 g _f / 25 mm In the above formula, A is the release force measured after laminating the release layer and the colored layer on the base film, and B is the release force of the final stamping foil. <Equation 2> 1.5 g _f / 25 mm ≤ B ≤ 5 g _f / 25 mm Where B is the release force of the final stamping foil. The method of claim 1, The base film has a single layer or multilayer structure and a stamping foil, characterized in that the thickness of 12 ~ 20㎛. The method of claim 1, The release layer has an acrylic resin, a polyethylene resin and a cellulose derivative as main components, and the acrylic resin is 50 to 80% by weight based on the total solids weight in the composition constituting the release layer. The method of claim 1, The coloring layer comprises an acrylic resin and a cellulose derivative, wherein the acrylic resin is stamping foil, characterized in that it comprises 10 to 50% by weight based on the total solids weight in the composition constituting the colored layer. The method of claim 1, The deposition layer is stamping foil, characterized in that the thickness is 100 ~ 400Å.