KR19990024749A - Hot stamping foil - Google Patents

Abstract

The present invention is a hot stamping foil in which a polyester substrate, a release layer, a coloring layer, a metal layer, and an adhesive layer are sequentially stacked, wherein the colored layer is 20 parts by weight of nitrocellulose with respect to 100 parts by weight of an isocyanate compound and 100 parts by weight of the isocyanate compound. It relates to a hot stamping foil, which is formed from a composition comprising 40 parts by weight, 80 to 120 parts by weight of diallylphthalate and 1 to 20 parts by weight of resorcinol. The hot stamping foil according to the present invention has no change in physical properties even after long-term storage and is excellent in heat resistance, glossiness, and wear resistance.

Description

Hot stamping foil

The present invention relates to a hot stamping foil having a colored layer having excellent storage stability and heat resistance.

Stamping foils are used to stamp metallic color patterns or letters on various substrates such as plastic moldings, leather, wood products and paper products to give them a brilliant appearance and to increase their commercial value. A layer (protective layer), a light reflection layer (metal layer), and an adhesive layer are laminated | stacked. Polyurethane resins are commonly used as the colored layer applied to provide excellent heat resistance and gloss to the stamping foil.

However, one of the problems commonly encountered when using a polyurethane resin colored layer is that the curing time does not sufficiently occur because the drying time for curing the colored layer is very short, so that many unreacted isocyanate functional groups (NCO) remain. When the product is stored for a long time, the residual isocyanate functional groups continue to react with moisture in the air at room temperature, which changes the initial physical properties and reduces the foil cutting ability, so that the cutting property is satisfactory when transferring small letters or patterns. A problem that becomes inconvenient arises.

Accordingly, the present invention improves such a problem, and in the hot stamping foil in which a polyester base material, a release layer, a coloring layer, a metal layer, and an adhesive layer are sequentially stacked, the number of functional groups of the isocyanate which is unreacted when forming the polyurethane colored layer is reduced. The purpose of the present invention is to provide a hot stamping foil having excellent heat resistance, glossiness, and abrasion resistance while minimizing physical property changes by minimizing it.

In order to achieve the above object, in the present invention, in a hot stamping foil in which a polyester substrate, a release layer, a coloring layer, a metal layer, and an adhesive layer are sequentially stacked, the colored layer is 100 parts by weight of an isocyanate compound, and 100 parts by weight of the isocyanate compound. It provides a hot stamping foil, characterized in that it is formed from a composition comprising 20 to 40 parts by weight of nitrocellulose, 80 to 120 parts by weight of diallylphthalate and 1 to 20 parts by weight of resorcinol.

Hereinafter, the present invention will be described in detail.

In the present invention, a polyurethane forming reaction is performed using a composition comprising an isocyanate compound, nitrocellulose, diallyl phthalate and resorcinol to form a colored layer of hot stamping foil.

The resorcinol which can be used in the present invention has a low molecular weight and is a primary alcohol, so that the reaction rate with the isocyanate is high, and as a result, the ratio of unreacted isocyanate is lowered. The resorcinol is used in an amount of 1 to 20 parts by weight, preferably 10 to 15 parts by weight, based on 100 parts by weight of the isocyanate compound.

When the amount of the resorcinol is less than 1 part by weight based on 100 parts by weight of isocyanate, the remaining amount of unreacted isocyanate increases, so that the physical properties change with the elapsed time of the hot stamping foil prepared therefrom, whereas when the amount is greater than 20 parts by weight The usable time of the crude liquid is shortened and it is not practical in coating. That is, since the curing proceeds even at room temperature, the liquid hardens when left at room temperature for a long time.

As the isocyanate compound, a toluene diisocyanate addition polymer (TDI adduct) type is used. Nitrocellulose is used to facilitate coating film formation, and diallyl phthalate serves to increase the cutting property of the coating film. In addition to the above components, a dye for imparting the color of the colored layer is added.

The coloring composition according to the present invention can be prepared by dissolving the isocyanate compound, nitrocellulose, diallyl phthalate, methylmethacrylic acid and dye in a solvent.

As the solvent, methyl ethyl ketone, methyl isobutyl ketone, butyl acetate, ethyl acetate, cyclohexanone, etc. may be used. In particular, a mixed solvent in which methyl ethyl ketone and cyclohexanone are mixed in a weight ratio of 70:30 to 40:60 Is preferred.

The hot stamping foil according to the present invention is prepared by coating the coloring composition on a polyester base film coated with wax, cellulose or an acrylic release layer by a conventional method, and then heat-treating at 150 to 190 ° C. for 3 to 30 seconds. It can be prepared by forming a colored layer on it, and then depositing a metal layer on the colored layer by a conventional method and forming an adhesive layer thereon.

The present invention will be described in more detail with reference to the following examples. In Examples and Comparative Examples, physical properties of the stamping foil were measured as follows.

1) heat resistance

The temperature when the gloss of the colored layer disappeared when the final stamping foil was stamped while raising the temperature of the metal mold was measured.

2) wear resistance

The extent to which the stamped foil transferred to the substrate was peeled off after 30 reciprocating frictions with a rubbing tester equipped with an eraser was visually evaluated in 1 to 9 steps (1: bad, 9: good).

3) glossiness

The gloss of the stamping foil transferred to the substrate was visually evaluated.

◎: excellent; ○: good; Δ: normal; ×: Bad

Example 1

A wax layer was used to form a release layer having a thickness of 0.01 μm on a polyester film having a thickness of 12 μm, and then a colored layer composition having a composition as shown in Table 1 was coated on the release layer by a gravure coating method, followed by 180 The colored layer was formed to a thickness of 1 μm by heat treatment at a temperature of 30 ° C. for 30 seconds. Aluminum was deposited to a thickness of 500 kPa on the film on which the colored layer was formed, and an adhesive layer was formed thereon to prepare a stamping foil.

Colored layer composition Usage (% by weight) Isocyanate TR-50 ¹⁾ 7 Resorcinol ²⁾ 0.7 Nitrocellulose 2 Diallyl phthalate 7 Methyl ethyl ketone 42.3 Cyclohexanone 40 Dye Orange G (Orange G) ³⁾ One ¹⁾ Aekyung Chemical Co., Ltd. ²⁾ product of Aldrich. ³⁾ Ciba Geigy.

Example 2

A stamping foil was prepared in the same manner as in Example 1 except that a colored layer composition having a composition as shown in Table 2 was used.

Colored layer composition Usage (% by weight) Isocyanate TR-50 ¹⁾ 7 Resorcinol ²⁾ One Nitrocellulose 2 Diallyl phthalate 7 Methyl ethyl ketone 42 Cyclohexanone 40 Dye Orange G (Orange G) ³⁾ One ¹⁾ Aekyung Chemical Co., Ltd. ²⁾ product of Aldrich. ³⁾ Ciba Geigy.

Comparative example

A stamping foil was prepared in the same manner as in Example 1 except that a colored layer composition having a composition as shown in Table 3 was used.

Colored layer composition Usage (% by weight) Isocyanate TR-50 ¹⁾ 7 Nitrocellulose 3 Diallyl phthalate 7 Methyl ethyl ketone 42 Cyclohexanone 40 Dye Orange G (Orange G) ³⁾ One ¹⁾ Aekyung Chemical Co., Ltd. ³⁾ Ciba Geigy.

The physical properties of the stamping foils prepared in Examples 1 and 2 and Comparative Examples were measured by the above-described physical property measurement method, and the results are shown in Table 4 below.

Example 1 Example 2 Comparative example Heat resistance 180 185 160 Wear resistance 4 5 3 Luster ○ ○ △

As can be seen above, the stamping foil having a colored layer formed from the colored layer composition according to the present invention has excellent gloss, wear resistance and heat resistance, and can be stored for a long time without a change in physical properties.

Claims (1)

In a hot stamping foil in which a polyester substrate, a release layer, a coloring layer, a metal layer, and an adhesive layer are sequentially stacked, the colored layer is 20 to 40 parts by weight of nitrocellulose based on 100 parts by weight of the isocyanate compound and 100 parts by weight of the isocyanate compound. , 80 to 120 parts by weight of diallyl phthalate and 1 to 20 parts by weight of resorcinol.