JPH0667664B2 - Hot stamping foil - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a hot stamping foil without a release layer.

2. Description of the Related Art The hot stamping method has been widely used as a method for patterning objects such as automobile parts, home appliances, display products, book covers, plastic containers, leather, and cloth.

As a hot stamping foil for this purpose, as shown in the sectional view of FIG. 4, a wax, synthetic dry oil, cellulose derivative, silicone, phospholipid, etc. is released on a base film (1) such as a polyester film. Layer (1
0) is provided, and a protective layer (3), a metal vapor deposition layer (4), and an adhesive layer (5) are further provided in this order from above, which is typically used.

In use, the adhesive layer (5) side of this hot stamping foil is overlaid on the object (7) and pressed from the base film (1) side with a heated mold (8). By this pressing, the adhesive layer (5) at the portion corresponding to the mold (8) is melted and adhered to the object (7). Therefore, when the mold (8) and the stamping foil are separated from the object (7), the mold ( Only the portion pressed by 8) is peeled from the base film (1) and transferred to the object (7).

When the object (7) is a bookbinding cover or cloth, this operation ends the hot stamping operation, but for applications requiring weather resistance and wear resistance such as automobile exterior parts, the hot stamping operation is applicable. It is customary to apply overcoating on the transfer piece formed on the article (7).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the hot stamping using the conventional hot stamping foil, the die (8) and the stamping foil are attached to the object (7) after the stamping operation.
As shown in Fig. 5, the release layer (1
0) or at the interface between the base film (1) and the release layer (10) as shown in FIG. 6, the surface of the transfer piece transferred onto the object (7) The release agent that forms the release layer (10) remains on a part or the entire surface.

However, if the release agent remains on the surface of the transfer piece in this way, the adhesiveness when overcoating from the transfer piece is reduced, and it may be aged over time when it is used in a harsh environment such as automobile parts. However, there was a problem that partial cracking and cracking occurred.

The present inventors have noticed that such a problem is caused by providing the release layer (10) on the base film (1), and hot stamping without the release layer (10). As a result of intensive studies to find a foil, the present invention has been achieved.

Means for Solving the Problems That is, the hot stamping foil of the present invention has a heat resistant resin cured layer (2) formed of a heat curable resin or an active energy ray curable resin on a base film (1). A transfer layer (6) comprising a protective layer (3), a metal vapor deposition layer (4) and an adhesive layer (5) is provided in this order on the heat-resistant resin cured layer (2), and the transfer layer (6) is provided during hot stamping. 6) is peeled from the interface between the heat-resistant resin cured layer (2) and the protective layer (3) and transferred to the object (7).

FIG. 1 is a sectional view showing an example of a hot stamping wheel of the present invention, and FIG. 2 is an explanatory view showing a state when hot stamping is performed on an object using this hot stamping wheel, FIG. 3 is an explanatory view showing a state in which overcoating is applied on the transfer piece formed on the object by hot stamping.

In each drawing (including FIGS. 4 to 6 described in the section of the prior art), (1) is a base film, (2) is a heat-resistant resin cured layer, (3) is a protective layer, and (4) ) Is a metal deposition layer,
(5) is an adhesive layer, (6) is a transfer layer, (7) is an object,
(8) is a mold, (9) is an overcoating layer, (10)
Is a release layer.

The layer structure of the hot stamping foil of the present invention will be described below.

Base film (1) As the base film (1), a synthetic resin film such as a polyester film, a polypropylene film, a polycarbonate film, a non-plasticized vinyl chloride film, a polystyrene film, or a cellulose-based film is used. In the case of a synthetic resin film, it is preferable to use a biaxially stretched film. At the time of manufacturing the base film (1), a filler, a stabilizer, a colorant, an antioxidant and the like can be added if necessary.

The thickness of the base film (1) is selected from the range of 5 to 50 μ, for example.

Heat-resistant resin cured layer (2) The resin for forming the heat-resistant resin cured layer (2) can be coated in liquid or solution form, and causes three-dimensional crosslinking by heating or irradiation with active energy rays such as ultraviolet rays and electron beams. It is used to form a cured layer that is heat-resistant to withstand heating during hot stamping.

Specifically, thermosetting polyester, thermosetting polyurethane, epoxy resin, polyimide, polyester imide, polyamide imide, melamine resin, phenol resin, urea resin, guanamine resin, heat-curable resin such as diallyl phthalate resin, and the like, Particularly, a combination of acrylic polyol or polyester polyol with epoxy resin, melamine resin, polyisocyanate or the like is preferable.

In addition, a UV curable resin or an electron beam curable resin mainly containing a prepolymer such as an acrylic acid ester of a polyhydric alcohol, an epoxy acrylate, a urethane acrylate, a polyester acrylate, a polyether acrylate, an acrylate alkyd, and a melamine acrylate and a polymerizable monomer. A resin such as a resin that is cured by irradiation with active energy rays is also used.

The heat-resistant resin cured layer (2) has a thickness of, for example, 0.2 to 3 μm.
Set to a degree.

Protective Layer (3) As the protective layer (3), acryl-based, urethane-based, melamine-based, phenol-based, urea-based, diallylphthalate-based, polyester-based, epoxy-based, alkyd resin, maleated rosin, polyvinyl butyral-based, cellulose Examples of the coating layer include a coating layer of various thermosetting resins or thermoplastic polymers, including a system, a polyamide system, a vinyl chloride-vinyl acetate copolymer system.

This protective layer (3) may be either a transparent layer or a colored layer. In the former case, the transfer pattern is given a metallic luster, and in the latter case, the transfer pattern is given a metallic tone coloring. The protective layer (3) may have a multilayer structure of two or more layers such as a transparent layer and a colored layer.

The protective layer (3) is a layer that traps metal vapor when the metal vapor deposition layer (4) is formed, is a layer that protects the metal vapor deposition layer (4) after transfer, and further, is a metal vapor deposition layer (4) during overcoating. It is also a layer that protects the adhesive layer (5).

The thickness of the protective layer (3) is set to, for example, about 0.5 to 10 μm.

Although not shown, the protective layer (3) can be additionally provided between the metal vapor deposition layer (4) and the adhesive layer (5) described later, if necessary.

Metal Vapor Deposition Layer (4) Examples of the metal vapor deposition layer (4) include vacuum thin film forming methods, that is, layers formed by vacuum vapor deposition, ion plating, sputtering, and the like.

Examples of the metal include aluminum, gold, silver, copper,
Examples thereof include nickel, chromium, titanium, stainless steel, iron, cobalt, molybdenum, rhodium, palladium, gallium, indium, iridium, zinc, tin, tantalum, platinum, and the like, which are used in the form of a simple substance, an alloy or a mixture. For exterior parts such as automobile parts, chromium, nickel, iron or alloys mainly containing these are preferable, and chromium or chromium alloys are particularly important.

The metal vapor deposition layer (4) may have a two-layer structure in which a certain metal is vapor-deposited and then another metal is vapor-deposited.

The thickness of the metal vapor deposition layer (4) is not particularly limited, but is 100 to 500
Often set to 0 Å, especially 150 to 1000 Å.

Adhesive Layer (5) As the adhesive layer (5), acrylic resin, vinyl acetate resin, vinyl chloride resin, rosin-modified maleic acid resin,
An adhesive layer having a hot-melt property such as polyester resin, ketone resin, synthetic rubber resin, polyamide resin, etc. is used.

The adhesive layer (5) is usually formed by solution coating, but in some cases, it may be formed by melt coating.

The thickness of the adhesive layer (5) is, for example, 1 to 5 μ when the solution coating method is adopted.

Transfer Layer (6) The above-mentioned protective layer (3), metal vapor deposition layer (4) and adhesive layer (5) constitute a transfer layer (6).

The transfer layer is the object (7) by hot stamping operation.
It is the layer transferred on top.

Object (7) The object (7) includes automobile parts, bicycle parts,
Home appliances, Buddhist tools, display products, name plates,
Bookbinding covers, plastic containers, leather, cloth, glassware,
There are various kinds of products such as interior products and furnishings, and one of the features of the present invention is that they are particularly suitable for applications requiring weather resistance and wear resistance such as automobile exterior parts.

Overcoating Layer (9) The overcoating layer (9) is a layer formed by coating on the transfer piece after the hot stamping operation is completed, and various coating materials such as acrylic, polyester, and urethane coatings are used. Used. It is particularly preferable to use a coating material having excellent weather resistance.

The thickness of the overcoating layer (9) can be set in a wide range, but it is often about 5 to 50 μm.

In working hot stamping, the adhesive layer (5) side of the hot stamping foil of the present invention is overlaid on the object (7),
The base film (1) side is pressed with a heated mold (8). By this pressing operation, the adhesive layer (5) in the portion corresponding to the mold (8) is melted and adhered to the object (7). Therefore, when the mold (8) and the stamping foil are separated from the object (7), Only the portion pressed by the mold (8) is peeled off from the base film (1), and the pattern is transferred to the object (7).

During this hot stamping, the transfer layer (6) is peeled from the interface between the heat-resistant resin cured layer (2) and the protective layer (3), and an overcoating layer (such as a residual piece of the conventional release layer (10) ( 9) No situation that hinders close contact with

After the transfer, if necessary, overcoating is performed on the transfer piece to form an overcoating layer (9). As a result, the weather resistance and the wear resistance are improved even in the case of use as an exterior. Examples Next, the present invention will be further described with reference to examples. Hereinafter, "%" and "parts" are expressed on a weight basis.

Example 1 30 parts of a methacrylic acid / 2-hydroxyethyl methacrylate / butyl methacrylate / acrylamide / butyl acrylate copolymer and a solid content of 60 were formed on a base film (1) made of a biaxially stretched polyester film having a thickness of 12 μm.
% Melamine prepolymer 15 parts, p-toluenesulfonic acid
After coating a solution with a solid content of 25% having a composition of 10 parts, a mixed solvent of toluene / methyl ethyl ketone / isobutyl alcohol / cellosolve acetate 45 parts, first dry at 80 ° C to volatilize the solvent, and further carry out a carry at 160 ° C for 1 minute. Then, a heat-resistant thermosetting resin layer (2) having a thickness of about 1 μ was formed.

Then, from above layer (2), a composition of 60 parts of methacrylic acid / 2-hydroxyethyl methacrylate / butyl acrylate copolymer, 20 parts of tolylene diisocyanate-based polyisocyanate, and 20 parts of methyl isobutyl ketone / butyl acetate mixed solvent was prepared. The urethane-based resin solution was coated and heated and dried at 120 ° C. to form a protective layer (3) having a thickness of about 1 μm.

Chromium is vapor-deposited on the surface of this protective layer (3) by a vacuum vapor deposition method to form a metal vapor-deposited layer (4) having a thickness of 400 Å.
Was formed.

Onto the metal vapor deposition layer (4), a toluene / methyl ethyl ketone / ethyl acetate mixed solvent solution of a butyl methacrylate copolymer hot melt adhesive is coated and dried at 80 ° C to form an adhesive layer (5) having a thickness of about 2μ. Formed.

By performing the above operation, the base film (1) / heat-resistant resin cured layer (2) as shown in the sectional view of FIG.
A hot stamping foil having a layer structure of / protective layer (3) / metal evaporated layer (4) / adhesive layer (5) was obtained. The total thickness was about 16μ.

Using this hot stamping foil, a stamping machine was used to hot stamp an ABS resin molded article as an example of the object (7) at 180 ° C. for 2 seconds.

As a result, only the portions of the transfer layer (6) (that is, the protective layer (3), the metal deposition layer (4) and the adhesive layer (5)) corresponding to the mold (8) are the heat resistant resin cured layer (2). It was peeled from the interface between the protective layer (3) and and was transferred onto the object (7).

In this state, the surface of the transfer piece transferred onto the object (7) and the surface of the heat-resistant resin cured layer (2) on the side of the base film (1) which is the transfer residual part were observed in detail. A situation in which part of the heat-resistant resin cured layer (2) remains on the surface of the protective layer (3), or conversely, part of the protective layer (3) remains on the surface of the heat-resistant resin cured layer (2). Was not seen at all.

Finally, from the transfer piece transferred to the object (7), a urethane paint having a composition of 60 parts urethane resin, 20 parts hexamethylene diisocyanate polyisocyanate, 40 parts butyl acetate / methyl isobutyl ketone mixed solvent is applied. It was coated and dried at 80 ° C. to form an overcoating layer (9) having an average thickness of 20 μm.

Using the test piece thus obtained, a weather resistance test was conducted with a weatherometer, but no abnormality such as peeling, cracking, cracking, etc. was observed even after 1000 hours.

Comparative Example 1 On a base film (1) made of a polyester film having a thickness of 12 μm, 5 parts of paraffin wax having a melting point of 80 to 120 ° C. to which a trace amount of dye was added was dissolved in 100 parts of an equal mixed solvent of toluene and xylene. Apply solution and dry
A release layer (10) having a thickness of 0.1 to 0.2 μm was formed, and hot stamping foil and hot stamping were performed in the same manner as in Example 1 below.

Observing the surface of the transfer piece formed on the object (7) by hot stamping and the surface of the punched part of the base film (1), the release layer (10) was found to be on the transfer piece side and the base film (1). It was randomly attached to both sides.

When overcoating similar to that of Example 1 was performed on the transfer piece transferred to the object (7) and a weather resistance test was performed, abnormalities such as peeling, cracks, and cracks were found in the weather resistance test for 600 hours. Admitted.

Comparative Example 2 On a base film (1) made of a polyester film having a thickness of 12μ, a solution prepared by dissolving 20 parts of cellulose acetate butyrate added with a trace amount of dye in 100 parts of a mixed solvent of an equal amount of toluene and xylene was applied, Dry to a thickness of about 1
A release layer (10) having a thickness of μ was formed, and hot stamping foils and hot stamping were performed in the same manner as in Example 1 below.

When the surface of the transfer piece formed on the object (7) by hot stamping and the surface of the punched part of the base film (1) were observed, the release layer (10) was almost present on the transfer piece side. However, a small part remained on the base film (1) side.

When overcoating similar to that of Example 1 was performed on the transfer piece transferred to the object (7) and a weather resistance test was performed, abnormalities such as peeling, cracks, and cracks were found in the weather resistance test for 600 hours. Admitted.

Example 2 The heat-resistant resin cured layer (2) was mixed with 50 parts of an epoxy acrylate prepolymer, 8 parts of 1,6-hexanediol diacrylate, 30 parts of trimethylolpropane triacrylate,
A hot stamping foil was prepared in the same manner as in Example 1 except that a UV-curable resin liquid consisting of 10 parts of a photopolymerization initiator and 1 part of a photopolymerization accelerator was used to perform irradiation with a high-pressure water source lamp for 1 second. Was created and hot stamping was performed.

As a result, the transfer sheet (6) corresponding to the mold (8)
Only the portion was peeled from the interface between the heat-resistant resin cured layer (2) and the protective layer (3) and transferred onto the object (7).

When overcoating similar to that of Example 1 was performed on the transfer piece transferred to the object (7) and a weather resistance test was performed, peeling, cracking, and
No abnormalities such as cracks were found.

EFFECTS OF THE INVENTION In the hot stamping foil of the present invention, the transfer layer (6) includes the heat-resistant resin cured layer (2) and the protective layer (3) without providing the release layer (10) as in the conventional case. Since it can be peeled from the interface of the above, even if the overcoating layer (9) is provided on the transfer piece transferred onto the object (7) after the hot stamping operation, the adhesion of the layer (9) is reduced for a long time. do not do.

Therefore, even if it is used as a component for automobile exteriors, excellent weather resistance and wear resistance are exhibited.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a hot stamping wheel of the present invention, and FIG. 2 is an explanatory view showing a state when hot stamping is performed on an object using this hot stamping wheel, FIG. 3 is an explanatory view showing a state in which overcoating is applied on the transfer piece formed on the object by hot stamping. FIG. 4 is a cross-sectional view showing a typical example of a conventional hot stamping foil, and FIGS. 5-6 show a state when hot stamping is performed on an object using the conventional hot stamping foil. It is the explanatory view shown. (1) ... Base film, (2) ... Heat-resistant resin cured layer, (3) ... Protective layer, (4) ... Metal deposition layer, (5)
…… Adhesive layer, (6) …… Transfer sheet, (7) …… Object, (8) …… Mold, (9) …… Overcoating layer, (10) …… Release layer

Claims (1)

[Claims] 1. A heat-resistant resin cured layer (2) formed of a heat-curable resin or an active energy ray-curable resin is provided on a base film (1), and the heat-resistant resin cured layer (2) is provided on the heat-resistant resin cured layer (2). A transfer layer (6) comprising a protective layer (3), a metal vapor deposition layer (4) and an adhesive layer (5) is provided in this order, and during hot stamping, this transfer layer (6) is referred to as the heat resistant resin cured layer (2). A hot stamping foil, characterized in that it is peeled from the interface with the protective layer (3) and transferred to the object (7).