KR100259125B1 - Hot stamping foil - Google Patents

Abstract

The present invention relates to a hot stamping foil having good releasability, cutting property, heat resistance and abrasion resistance, and more particularly, in a hot stamping foil in which a polyester substrate, a curable release layer, a colored layer, a metal layer, and an adhesive layer are sequentially stacked. Hot stamping foil, characterized in that the layer is formed from a composition comprising a melamine resin, 20 to 50 parts by weight of a carboxylic acid group-containing acrylic copolymer with 180 to 240 parts by weight maleic acid rosin relative to 100 parts by weight of melamine resin and 6 parts by weight of an acid catalyst It is about.

Description

Hot Stamping Foil {HOT STAMPING FOIL}

The present invention relates to a hot stamping foil having good releasability, cutting property, heat resistance and wear resistance.

As the release layer of the stamping foil, wax or cellulose-based release layer has been mainly used, but cutting properties, gloss, high workability, overprinting properties before stamping foil are basically required. Printing on a slope) and the like is poor.

In order to improve this, a curable release layer that cures melamine and is used as a release layer has been proposed. Although the curable release layer has excellent basic physical properties, after the foil including the curable release layer is transferred, a layer that acts as a surface protection layer is proposed. No wear resistance is very weak. Therefore, the physical properties of the colored layer play a big role. In general, when using a curable release layer, the colored layer is formed by the curing reaction of melamine and rosin. The reason is that it is excellent in gloss and cutting property. If the wear resistance of the colored layer itself is insufficient, if the foil including the colored layer having a low heat resistance of 140 ° C. is transferred to a high temperature plastic on a high temperature transfer temperature, the matting phenomenon occurs that the gloss disappears when the stamping operation is performed at a high temperature. There is this.

It is therefore an object of the present invention to improve these problems, to provide a hot stamping foil having excellent wear resistance and heat resistance while maintaining cutting properties and gloss.

In order to achieve the above object, in the present invention, in a hot stamping foil in which a polyester base material, a curable release layer, a coloring layer, a metal layer, and an adhesive layer are sequentially stacked, the colored layer is based on 100 parts by weight of the melamine resin and the melamine resin. A hot stamping foil is provided, which is formed from a composition comprising from 180 to 240 parts by weight of a maleic acid based rosin 20 to 50 parts by weight of a carboxylic acid containing acrylic copolymer and 6 parts by weight of an acid catalyst.

Hereinafter, the present invention will be described in detail.

In the present invention, in order to form a colored layer of hot stamping foil, melamine and maleic acid rosin are cured by heat under an acid catalyst.

As the melamine resin, urea-melamine resin, melamine resin, urea resin and the like may be used, and urea-melamine resin is preferable. Urea-melamine resins can be cured at low temperatures, react quickly, and give excellent physical properties.

The maleic acid rosin preferably has an acid value of 39 or less and a glass transition temperature (Tg) of 140 to 150 ° C. Maleic acid-based rosin has excellent gloss and high heat resistance due to its high glass transition temperature (Tg). Maleic acid-based rosin may be used in an amount of 180 to 240 parts by weight with respect to 100 parts by weight of melamine resin, and when the amount of maleic acid-based rosin is less than 180 parts by weight, the cutting property is lowered, and when it is more than 240 parts by weight, heat resistance and wear resistance Degrades.

The acid catalyst catalyzes the curing reaction of the melamine resin and the maleic acid rosin. As the acid catalyst, an organic phosphate catalyst such as diethyl phosphate or paratoluene sulfonic acid may be used, and diethyl phosphate is preferable. The acid catalyst is used in 6 parts by weight. When the amount of the acid catalyst is less than 6 parts by weight, the heat resistance is lowered due to insufficient curing reaction. When the acid catalyst is used in excess of 6 parts by weight, the acid catalyst remains in the colored layer and the aluminum adhesion is inhibited even after the curing reaction is completed. There is a side effect of promoting the gradual decomposition of the colored layer.

The carboxylic acid group-containing acrylic copolymer has an acid value of 100 to 150, preferably an acid value of 128 to 132, and the carboxyl group causes a curing reaction with the melamine resin. The acrylic copolymer may be used in the melamine resin in an amount of 20 to 50 parts by weight based on 100 parts by weight, but when the amount is less than 20 parts by weight, the heat resistance is lowered, and when the amount exceeds 50 parts by weight, the cutting property is lowered.

The hot stamping foil according to the present invention is coated with the colored layer composition in an amount of 0.8 to 1.2 g / m < 2 > It can be prepared by forming a colored layer on a substrate by heat treatment for from 20 seconds, then depositing a metal layer by a conventional method on the colored layer and forming an adhesive layer thereon.

Physical properties such as cutting properties, heat resistance, solvent resistance, and the like of the colored layer may vary depending on the type of rosin. In addition, the physical properties may vary depending on the degree of curing reaction. If the curing is insufficient, heat resistance, aluminum adhesion, wear resistance is insufficient, and if the curing is excessive, heat resistance is increased, but cutting property, aluminum adhesion is insufficient. Therefore, the degree of curing reaction can be controlled by adjusting the amount and calorific value of the acid catalyst to suit the required physical properties.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the contents of the present invention are not limited thereto.

In Examples and Comparative Examples, physical properties of the steaming foil were measured as follows.

1) Peeling level (deformation degree)

The force applied when the cellophane tape was attached to the finished foil with a width of 1 cm and then peeled off was evaluated by dividing the level into 1 to 10 steps. In this case, peeling is not performed at all, and in the case of peeling with a very weak force, it is 10 steps. In general, it is convenient to use when peeled off with a weak force.

2) Evaluation of machinability

When stamping with a metal mold, stampable font size was evaluated by dividing it into grades 1-10. At this time, the size of the letter is less than 0.4 mm in width 1 grade, 0.4 mm in 2-3 grade, 0.6 mm in 4-5 grade, 0.8 mm in 6-7 grade, 8 in 1 mm A grade of -9 and more than 1 mm was rated as 10.

3) heat resistance

The transfer temperature at which the transfer surface was quenched during stamping was measured.

4) wear resistance

After transferring the stamping foil onto the plastic substrate, a rubbing tester (Clockermeter, James H. Heal & Co. Ltd) equipped with an eraser on the surface was used to reciprocate until the surface was peeled off and the metal deposition layer appeared. Was measured.

Examples 1 to 3 and Comparative Examples 1 and 2

On a polyester base film having a thickness of 12 μm, a release layer composition [melamine resin (Clear300, Hwashin Chemical) 2% by weight, diethylphosphate (Aldrich) 0.12% by weight, toluene 40% by weight, methanol 30% by weight and methyl ethyl ketone 27.88% by weight] was coated in an amount of 0.03 g / m 2 using a gravure roll and then dried at 180 ° C. for 10 seconds. The colored layer composition according to the composition of Table 1 was coated on the release layer in an amount of 1 g / m 2, dried at 180 ° C. for 10 seconds, and then aluminum was deposited thereon. ) Was coated in an amount of 1.0 g / m 2 to prepare a stamping foil.

Composition of colored layer (kg) Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Melamine Resin Clear300 ¹⁾ 10 10 10 10 10 10 Rosin Malkyd No6 ²⁾ 23 22 21 20 26 19 Acrylic Copolymer Surco1441 ³⁾ 2 3 4 5 One 6 Diethylphosphate 0.6 0.6 0.6 0.6 0.6 0.6 toluene 15 15 15 15 15 15 Methyl ethyl ketone 35 35 35 35 33 35 Cyclohexanone 14 14 14 14 14 14 Dye Orange G (Orange G) ³⁾ One One One One One One ¹⁾ Hwashin Chemical ²⁾ Arakawa ³⁾ Allied Colloids ⁴⁾ Ciba Geigy

Peeling level, cutting property, heat resistance and wear resistance of the stamping foil were measured, and the results are shown in Table 2 below.

Standard property Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Peeling level 6 or more 8 9 9 9 9 9 Machinability 4 or less 3 4 4 4 2 5 Heat resistance (℃) More than 140 160 160 170 180 130 180 Wear resistance (times) over 10 32 36 43 46 27 52 Standard property indicates the level of physical properties usable as stamping foil

As shown in Table 2, the stamping foils of Examples 1 to 4 have very good physical properties such as peeling level, cutting property, heat resistance, and abrasion resistance, whereas the stamping foils of Comparative Examples 1 and 2 have poor cutting properties and heat resistance, respectively. It can be seen.

The hot stamping foil of the present invention has good releasability, cutting property, heat resistance and wear resistance.

Claims (3)

In a hot stamping foil in which a polyester substrate, a curable release layer, a colored layer, a metal layer, and an adhesive layer are sequentially stacked, the colored layer is 180 to 240 parts by weight of maleic acid rosin 20 to 50 parts by weight with respect to 100 parts by weight of melamine resin and melamine resin. A hot stamping foil formed from a composition comprising parts by weight of a carboxylic acid containing acrylic copolymer and 6 parts by weight of an acid catalyst. The hot stamping foil of claim 1, wherein the melamine resin is a urea-melamine resin. The hot stamping foil of claim 1, wherein the acid value of the carboxylic acid-containing acrylic copolymer is in the range of 128 to 132.