KR0139325B1 - Stamping foil - Google Patents

Abstract

According to the present invention, in a known stamping foil in which a release layer, a protective layer, a metal adhesion layer, and an adhesive layer are sequentially formed on one side of a plastic film support, the release layer is omitted and the composition of the protective layer is 80 to 99% by weight. By setting the soluble dye dissolved in an organic solvent at 1 to 20% by weight, the mold release layer is omitted, and the mold release foil is excellent in mold release and cutting property, and at the same time, the stamping foil which solves the process problem such as penetration of the protective layer by the adhesive solution is solved. will be.

Description

Stamping foil

The present invention relates to a stamping foil, and more particularly, to a stamping foil having excellent properties without a release layer and no problem in the manufacturing process.

Stamping foil is a kind of thermal transfer is used in the printing method for transferring the coating on the plastic film support to the transfer target. Since the stamping process is a dry printing method, it does not require a drying process, does not smell, and has excellent metallic luster as compared to other printings, so it is excellent in book covers, albums, catalogs, greeting cards, postcards, cards, and boxes. It is used in myriad kinds of transfer objects such as, containers and notebooks, and its application is expected to be gradually expanded in the future.

In general, the stamping foil has a structure in which a release layer coated with wax, cellulose, an acrylic resin, or the like is formed on a support film such as polyester or polypropylene, and a resin having excellent heat resistance and chemical resistance is formed on the release layer. The coating layer forms a protective layer, and aluminum or chromium, copper, silver, and gold are deposited in a high vacuum to form a metal layer, and an adhesive layer is formed on the metal layer by coating an adhesive layer suitable for a transfer object.

In such stamping foils, the uneven thickness of the coating layer of the product is often caused by an extremely thin release layer.

The present invention omits the release layer in order to solve the problem of non-uniformity of the product due to this release layer, and at the same time designed the composition of the protective layer to solve the problem in the manufacturing process caused by the absence of the release layer.

Accordingly, an object of the present invention is to provide a stamping foil which is excellent in mold release property and cutting property without a release layer, and at the same time, there is no process problem.

Hereinafter, the present invention will be described in detail. In the present invention, the release layer is omitted on the surface of the plastic film support, and a protective layer, a metal adhesion layer, and an adhesive layer are sequentially formed. The protective layer is a soluble dye dissolved in 80 to 99% by weight of nitrocellulose and an organic solvent. It relates to a stamping foil, characterized in that the resin composition consisting of 1 to 20% by weight.

Referring to the present invention in more detail as follows.

Generally, in the case of a pigment stamping foil of a special stamping foil, a release layer may not be designed.

In the case of the pigment foil, since a large amount of inorganic particles are contained in the protective layer and the adhesion between the protective layer and the support is not large, the release property is often good during thermal transfer of the stamped foil onto the transfer object without designing a release layer.

In the present invention, even when there is no release layer and the protective layer contains no inorganic particles and only dyes dissolved in an organic solvent, the structure and protection of the stamping foil are excellent in releasability and cutting property and there are no problems in manufacturing process. The layer relates to the composition.

In order to achieve the above object, a resin composition composed of 80 to 99% by weight of a vaginal surface, which is a resin having a small adhesion to a support, and 1 to 20% by weight of a soluble dye dissolved in an organic solvent, is used as a protective layer.

When the content of the soluble dye exceeds 20% by weight of the entire protective layer, the releasability and cleavability becomes better, but the penetration of the protective layer by the solvent in the adhesive solution increases rapidly, causing problems in the manufacturing process. This is because in the case of soluble dyes, the solubility in toluene, ester, ketone-based adhesive solvent is very high.

The soluble dye of the present invention can be used as long as it is a dye which is dissolved in an organic solvent such as methyl ethyl ketone, isopropyl alcohol, ethyl acetate, toluene or more by 2% by weight or more. , Savinyl dyes from Sandoz, Switzerland and Orgalon dyes from Kelly Chemical Corp., Taiwan.

In addition, in order to solve the process problems, the polymer screen has excellent durability and uses an average polymerization degree of 250 to 380 (RS 20 seconds to RS 60 seconds).

The relationship between the average degree of polymerization and the number of seconds of the vaginal phase is shown in Table 1 below.

Number of seconds and average degree of polymerization Number of seconds Average degree of polymerization RS 1/16 sec 35-45 RS 1/8 sec 45-55 RS 1/4 sec 55-70 RS 1/2 sec 80-95 RS 1 sec 95-110 RS 20 sec 250-290 RS 60 sec 330-380 RS 120 seconds 400-480

* 1. The number and molecular weight relationship of vaginal screen is classified based on KSM 3814, and H (RS) refers to the nitrogen content in vaginal screen ranging from 11.5 to 12.2 wt%.

The problem here is that when the adhesive solution is applied on the intermediate layer, when the durability of the protective layer is weak (especially solvent resistance), the organic solvent in the adhesive solution partially penetrates into the protective layer and dissolves the protective layer to prevent the protective layer from being destroyed. It means to cause. In order to prevent such a protective layer breakage, the higher the molecular weight of the vaginal surface, the more advantageous.

However, when the average degree of polymerization of the vaginal surface exceeds 380 it is more difficult to use because the durability is more excellent but the cutting property is sharply poor.

According to the present invention as described above, even though there is no release layer, it is possible to obtain a stamping foil having excellent releasability and cutting property and at the same time without a process problem of penetration of a protective layer by an adhesive solution solvent.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the Examples.

Example 1

Methyl ethyl ketone was obtained in a 12 µm polyester film with an average degree of polymerization of 300 mg of 90% by weight of the total weight of the protective layer and a soluble dye (Orsol Orange G from Ciba-Geigy, Germany) of 10% by weight of the total weight of the protective layer. And it was dissolved in a mixed solvent of ethyl acetate (mixing weight ratio 1: 1) and coated with a gravure coater so that the thickness after drying to 1.0㎛.

Then, aluminum was deposited to a thickness of 400 kPa using a vacuum decanter to form a metal layer. Ketone resin, vinyl chloride-vinylacetate copolymer, chlorinated polypropylene resin, and vinyl acetate resin were mixed with silica particles on the metal layer to prepare a solution of 12% concentration in a mixed solvent of toluene and ester (mixed weight ratio 3: 1). An adhesive layer was formed by coating with a gravure coater at a speed of 20 m per minute.

Example 2

Example 1 was carried out in the same manner as in Example 1, except that the average degree of polymerization of the vaginal screen is 260.

Example 3

Example 1 was carried out in the same manner as in Example 1, except that the average degree of polymerization of the vaginal screen is 370.

Example 4

Example 1 was carried out in the same manner as in Example 1 except that the content of the vaginal surface was 82% by weight of the total solids of the protective layer and the content of the soluble dye was 18% by weight of the total solids of the protective layer.

Example 5

Example 1 was carried out in the same manner as in Example 1 except that the content of the vaginal phase was 97% by weight of the total solids of the protective layer and the content of the soluble dye was 3% by weight of the total solids of the protective layer.

Comparative Example 1

Except for curing by adding 300 parts by weight of isocyanate curing agent (Aekyung Chemical TR-50) to the composition of the protective layer in Example 1 to 100 parts by weight of the vaginal screen.

Comparative Example 2

Except that in Example 1 using RS 1/16 seconds (average degree of polymerization 40) of the vaginal screen and curing by adding 300 parts by weight of isocyanate curing agent (Aekyung Chemical TR-50) to 100 parts by weight of the vaginal screen. It carried out similarly to 1.

Comparative Example 3

In Example 1, the composition of the protective layer was carried out in the same manner as in Example 1, except that an acrylic resin having a number average molecular weight of 25,000 was used.

[Comparative Example 4]

In Example 1, the composition of the protective layer was carried out in the same manner as in Example 1, except that an epoxy resin having a number average molecular weight of 15,000 was used.

[Comparative Example 5]

The composition of the protective layer in Example 1 was carried out in the same manner as in Example 1, except that the polyvinyl chloride resin having a number average molecular weight of 25,000.

Comparative Example 6

The composition of the protective layer in Example 1 was carried out in the same manner as in Example 1, except that a polyurethane resin having a number average molecular weight of 25,000.

Comparative Example 7

Except for using the vaginal screen of RS 1/2 second (average degree of polymerization 88) in Example 1 and was carried out in the same manner as in Example 1.

Comparative Example 8

Except for using the vaginal screen of RS 120 seconds (average degree of polymerization 440) in Example 1 was carried out in the same manner as in Example 1.

Comparative Example 9

Except that the dye content in Example 1 is 30% by weight of the total protective layer resin and the quality screen is 70% by weight was carried out in the same manner as in Example 1.

Table 1 shows the releasability, cleavability, and solvent penetration of the above Examples and Comparative Examples.

Release, Cleavage, Solvent Penetration division Dysplasia Machinability Solvent penetration Comprehensive Evaluation Example 1 5 points 4 points radish Very good Example 2 5 points 5 points radish Very good Example 3 5 points 4 points radish Very good Example 4 5 points 5 points radish Very good Example 5 5 points 4 points radish Very good Comparative Example 1 1 point 5 points radish Bad Comparative Example 2 0 points 5 points radish Bad Comparative Example 3 1 point 5 points medium Bad Comparative Example 4 1 point 3 points radish Bad Comparative Example 5 1 point 3 points medium Bad Comparative Example 6 0 points 2 points radish Bad Comparative Example 7 5 points 5 points U Bad Comparative Example 8 5 points 2 points radish Good Comparative Example 9 5 points 5 points U Bad

[Assessment Methods]

1. Evaluation of dysplasia

The die area of the transfer machine (when the stamping foil manufactured by changing only the protective layer and the same layer except for the protective layer and the protective layer was stamped at a pressure of 3kg · f / ㎠ in the Up-Down transfer machine (the die area is horizontal) 5% to 5% to 15cm in length, and 5% to 15cm in length) are adhered to 5 points, and 5 points to 85% to 90% are good when 90% to 95% are bonded. In case of bonding, it is usually 3 points, 80% to 85% in case of adhesion, 2 points as bad, and in case of less than 80% of the bonded area, it is classified as 1 point as bad. When it was not possible to use the product within the range of temperature and pressure of the manual and Heidelberg automatic machines, the dysplasia was classified as impossible and evaluated as 0.

2. Cutting property evaluation

The automatic transfer machine used Heidelberg automatic cylinder machine. The cutting performance was evaluated by stamping foil with a square lattice engraved. The lattice of 0.5 mm, 0.7 mm and 1.0 mm in length and width, respectively, was 0.5 mm in height. When stamped at a pressure of 3kg · f / ㎠ with a stamping die with engraving, it was evaluated as the resolution of the printed square pattern. When the resolution of 0.5mm plaid was good, the resolution of 5 points and 0.5mm plaid was very good. If the resolution is partially good, 4 points, the 0.5 mm plaid resolution is poor, but if the resolution of the 0.7 mm plaid is good, 3 points are normal. , The case where the resolution of the 0.7 mm lattice pattern was poor was evaluated as being very poor and divided into one point.

3. Evaluation of Solvent Penetration Degree of Protective Layer

When the protective layer and the intermediate layer are designed on the support, and the adhesive layer is applied at a speed of 5 m / min or more, when the organic solvent in the adhesive solution penetrates the protective layer, it is thin in the protective layer when observed with a microscope of 30 to 50 magnification. As the cracks were seen, the degree of penetration was evaluated by the presence or absence of such cracks. In other words, when it is certain that the adhesive solvent penetrates and destroys the protective layer, it is evaluated as nothing when the channel does not penetrate at all.

4. Comprehensive Evaluation

Without the solvent penetration phenomenon of the protective layer, the sum of the releasability evaluation score and the cleavage evaluation score is 9 or more, very good, 7 to 8 is good, 5 to 6 is normal, 3 to 4 is poor, If the score is less than 3, it is classified as very poor. If the score of release property is 0, the score of cutability is 1, or if a solvent penetration phenomenon occurs in the protective layer, it is classified as bad regardless of the sum of scores of release property and cutability. Evaluated.

According to the evaluation results of the Examples and Comparative Examples, when the release layer was not designed, acrylic, epoxy, polyvinyl chloride, and polyurethane resins were used as the resin of the protective layer. The membrane of the layer is fragile and solvent penetration also occurs.

Moreover, when hardening | curing by adding a hardening | curing agent to a protective layer without designing a mold release layer, since adhesive force with a support body generate | occur | produces and mold release does not become, mold release property is extremely bad.

In addition, when the vaginal screen is used as a resin for the protective layer without designing a release layer, when the vaginal screen having a number of seconds less than 20 seconds is used, the solvent penetration phenomenon occurs due to the poor solvent resistance of the vaginal screen. In case of using a vaginal screen having a number of seconds longer than 60 seconds, there is no solvent penetration but the cutting property is poor.

Claims (3)

The release layer is omitted on one side of the plastic film support, and a protective layer, a metal adhesion layer, and an adhesive layer are sequentially formed. The protective layer is 80 to 99% by weight of nitrocellulose and soluble dyes 1 to 20 dissolved in an organic solvent. Stamping foil, characterized in that the resin composition consisting of weight percent. The stamping foil of claim 1, wherein the vaginal surface has an average degree of polymerization of 250 (RS 20 seconds) to 380 (RS 60 seconds). The stamping foil of claim 1, wherein the soluble dye is dissolved in at least 2% by weight in methyl ethyl ketone, isopropyl alcohol, ethyl alcohol or toluene.