JPH0716448Y2 - Transfer foil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a transfer foil having a metallic surface with improved electrostatic resistance.

[Prior Art] A metal-deposited transfer foil having a metallic tone for a plastic molding or the like that has been conventionally used has a release layer and a protective layer sequentially laminated on a plastic substrate, and aluminum, and A metal thin film layer is laminated by vacuum deposition with a metal such as copper or chrome to a thickness that gives a metallic luster, the reflectance in the visible light range is 50% or more, and the decorative function is fully provided, and the adhesive layer is formed on top of it. The most general case is to provide and configure. In this case, the surface resistance value of the metal thin film layer is conventionally set to several tens Ω / hole or less because of the necessity of expressing a metallic luster.

However, the transfer foil produced by these conventional methods,
Static electricity is generated when used by hot stamping on a substrate such as plastic, and when a charged object is brought close to it, the charge instantly flows through the metal thin film layer and becomes unbearable and partially sparks. The metal thin film layer is destroyed by the above, the appearance becomes dirty, and the decorative effect of the metallic tone is greatly impaired.

[Problems to be Solved by the Invention] The purpose of the present invention is to suppress the spark phenomenon due to static electricity, which was a problem with conventional transfer foils, and to improve the electrostatic resistance. It is intended to provide a transfer foil having a metallic luster similar to that of a conventional one and having a decorative effect. As a result of the examination, the reflectance of visible light of the metal thin film layer was set to 40% or more, and the surface resistance value was significantly increased to 10 ³ Ω / port or more, thereby improving the electrostatic resistance. It has been found that an improved metal tone transfer foil can be obtained.

[Means for Solving the Problems] In a transfer foil in which a release layer, a protective resin layer, a metal thin film layer, and an adhesive layer are sequentially laminated on a sheet base material, the surface resistance value of the metal thin film layer is 10 ³ Ω. It can be achieved by a transfer foil characterized by having a reflectance of 40% or more for visible light as defined below.

The most characteristic point of the metal transfer foil according to the present invention is that the surface resistance value of the metal thin film layer constituting the metal transfer foil is 10 ³ Ω / mouth or more and the reflectance of visible light is 40% or more. Especially. If the surface resistance value of the metal thin film layer is less than 10 ³ Ω / port, the electrostatic resistance due to sparking or the like cannot be made 10 kV or more, and the metal thin film layer disappears and the object of the present invention cannot be achieved. The surface resistance of the metal thin film layer is 10 ⁶ Ω.
/ Mouth or more is preferable.

The metal thin film layer having a surface resistance value of 10 ³ Ω / mouth or more is, for example, a discontinuous layer made of Sn or Sn alloy having a sufficient metallic luster on the protective resin layer provided on the sheet base material. It can be formed by vacuum evaporation of the film.

The reflectance of visible light (wavelength 300-800mμ) of metal thin film layer is 4
If it is less than 0%, the metallic luster when formed into a transfer processed product is insufficient and the object of the present invention cannot be achieved.

The release layer constituting the metal transfer foil according to the present invention is composed of, for example, a resin such as cellulose, silicone or wax, or a coating layer of a mixture of two or more kinds, and the thickness thereof is usually 0.05 to 1.0 μm. Although preferred, some changes are possible depending on the purpose.

The protective resin layer is composed of, for example, an acrylic resin, a melamine resin, a phenol resin, an epoxy resin, or the like, or a coating layer of a mixture of two or more kinds, and the thickness thereof is generally 1.0 to 3.0 μ.

Both pressure-sensitive and heat-sensitive adhesive layers are used as the adhesive layer. For example, acrylic acid esters, polyvinyl butyral, polyvinyl acetate, vinyl chloride-vinyl acetate copolymers, etc. are commonly used. The method for applying these adhesives is also not particularly limited, but the thickness is generally in the range of 0.1 to 20 μ, and 1.0 to 5.0 μ is preferable. When this thickness is thin, the adhesive strength becomes insufficient, while when it is thick, there is a problem that the adhesive strength is good, but the edges after transfer are not clear, that is, the edges are not well cut and are jagged and the appearance is poor.

FIG. 1 is a side sectional view of an embodiment of a transfer foil according to the present invention, in which a release layer 2, a protective layer 3, a metal thin film (vapor deposition) layer 4 and an adhesive layer 5 are provided on a sheet base material 1. A transfer foil is formed by sequentially laminating the transfer foil.

FIG. 2 is a side sectional view of the transfer foil of FIG. 1 when it is heat-transferred onto a polystyrene plate, 1 is a sheet base material that is peeled off at the time of transfer, 2 is a release layer, and 3 is a protective layer. 4 is a metal thin film (vapor deposition) layer, 5 is an adhesive layer, and 6 is a polystyrene plate.

[Advantage of the Invention] The transfer foil according to the present invention has excellent electrostatic resistance,
It can withstand a voltage of 10kV or higher even when it is transferred to household appliances that are easily charged, such as stereos and TVs.
It has good physical properties. For this reason, the application range of the transfer foil can be greatly expanded as compared with the conventionally known transfer foil.

The effects of the transfer foil according to the present invention will be described below with reference to examples.

Incidentally, the reflectance of visible light of the metal thin film layer constituting the transfer foil in the example, using a Hitachi Spectrometer 330 type (using integrating sphere) reflectance measuring device, the reflectance between wavelength 300 ~ 800mμ. The measured value is displayed.

Example 1 An acetone solution having a concentration of 2% of cellulose resin was applied as a release layer on one surface of a polyethylene terephthalate film having a thickness of 25 μ with a 180 mesh gravure roll, and the temperature was 120 ° C. and 20 m / m.
It was dried for min to form a release layer. Next, a 20% melamine resin toluene solution was applied onto it with a 180 mesh gravure roll, dried at 150 ° C. and 20 m / min to form a release layer, and a 1 × 10 ⁻⁴ Torr vacuum was placed on it. Among them, tin is vapor-deposited on a discontinuous film with a thickness (200 Å) such that the surface resistance value is 10 ⁶ Ω / mouth
Then, an acrylic heat-sensitive adhesive was applied by a reverse coater to a thickness of 2.0 μm and dried at 100 ° C. and 20 m / min to prepare a metal transfer foil having electrostatic resistance.
The surface resistance of the obtained transfer foil (deposition processed surface) is 10
^{Even when} static electricity of 10 kV was applied to this at ⁶ Ω / mouth, the spark phenomenon did not occur, and the tin thin film layer did not disappear.

Comparative Example 1 A one-sided 25 μm thick polyethylene terephthalate film was coated with a 180% mesh gravure roll of an acetone solution having a concentration of 2% of cellulose resin as a release layer, and the temperature was 120 ° C. and 20 m / m.
dried at min. Next, a toluene solution having a melamine resin concentration of 20% was applied as a protective layer thereon by a 180-mesh gravure roll and dried at 150 ° C. and 20 m / min to form a protective layer. Furthermore, aluminum is applied on this protective layer in a vacuum of 1 × 10 ^-4 Torr and the surface resistance is 2.0Ω / thickness (600Å)
After vapor-depositing on a continuous film, the acrylic thermal adhesive was applied on the vapor-deposited film with a reverse coater so as to have a thickness of 2.0 μm, and dried at 100 ° C. at 20 m / min to prepare a metal-tone transfer foil.

The foil characteristics of the anti-static transfer foil of the present invention having the discontinuous vapor deposition thin film of tin obtained in Example 1 and the conventional transfer foil having the continuous vapor deposition thin film of aluminum obtained in Comparative Example 1 were measured. The comparison results are shown in the table below.

[Brief description of drawings]

FIG. 1 shows a side sectional view of an embodiment of the transfer foil according to the present invention, and FIG. 2 shows a side sectional view of the transfer foil of FIG. 1 when it is heat-transferred onto a polystyrene plate. 1 ... Sheet base material, 4 ... Metal thin film (vapor deposition) layer, 2 Release layer, 5 ... Adhesive layer, 3 ... Protective layer, 6 ... Polystyrene plate

Claims (1)

[Scope of utility model registration request] 1. A transfer foil comprising a release layer, a protective resin layer, a metal thin film layer, and an adhesive layer, which are sequentially laminated on a sheet base material,
The transfer foil is characterized in that the surface resistance of the metal thin film layer is 10 ³ Ω / mouth or more and the reflectance with visible light is 40% or more.