JPH01174584A - Tacky sheet of metallic gloss - Google Patents

Abstract

PURPOSE:To obtain the above sheet suitable for materials to be bonded having three-dimensional curve such as automobiles and motorcycle, having excellent heat resistance, adhesivity to curved surface and printability, by providing the surface of a fluorine-containing film with a metal thin film layer and forming a pressure-sensitive adhesive layer. CONSTITUTION:A metal thin film layer 2 is formed on the surface of a fluorine- containing film 1, further a pressure-sensitive adhesive layer 3 is set on the under surface of the layer and the pressure-sensitive layer is protected with a release layer 4. Optionally a metal thin layer 2A is formed on the top of the film 1 and further a printing layer 5 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a metallic luster adhesive sheet, particularly to a metallic luster adhesive sheet that can be suitably attached to an adherend having a three-dimensional curved surface.

[Conventional technology]

Traditionally, metallic luster adhesive sheets have been known that are made by vacuum-depositing aluminum on the back side of a polyester film, applying a pressure-sensitive adhesive to the vapor-deposited side, and laminating silicone-treated release paper. They were used as labels and stickers after being colored or printed in an appropriate manner.

In recent years, this type of metallic gloss adhesive sheet has come to be used to decorate adherends with complex three-dimensional curved surfaces such as automobiles, motorcycles, and sports equipment. In addition, in order to enhance the decorative effect, a clear coat is applied after adhering to the adherend, and generally 150%
Baking is done at a temperature of around 30°F.

[Problem that the invention seeks to solve]

However, since the base material of the conventional metallic gloss sheet is a polyester film, although it has sufficient heat resistance for baking paint, it is not flexible, so when it is attached to an excessively curved surface, it may wrinkle around the periphery. ff1l @If occurred, which became a practical bottleneck. Moreover, polyester film has poor gas permeability, so
Volatile substances contained in the adherend itself or the paint may gasify due to heating, causing bubbles and blisters on the adhesive sheet.

Therefore, the present inventors conducted various studies to use a highly flexible film as a base material. For example, we investigated vinyl chloride, urethane, polypropylene, etc., but
Although it has a certain degree of heat resistance, when the temperature reaches about 150℃, the vapor deposited layer is destroyed and the metallic luster disappears.
The texture will be significantly different from what you are trying to achieve.

Therefore, the main object of the present invention is to provide a metallic luster adhesive that is highly flexible, has excellent adhesion to curved surfaces, prevents thermal destruction of the metal thin film layer, and has excellent heat resistance to allow gas generated by heating to pass through. The purpose is to provide seats.

In particular, an object of the second invention is to provide a metallic luster adhesive sheet which, in addition to the above object, also has good printability.

[Means for solving problems]

The first invention for solving the above problems is characterized in that a fluorine-containing film has a metal thin film layer on at least one side, and a pressure-sensitive adhesive layer is formed thereon.

In addition, the second invention is a coextruded 2M film of a polyvinyl fluoride resin as a lower layer and a resin that is more susceptible to printing as an upper layer, and a metal thin film layer is interposed on at least the lower surface of the film, and the lower surface of the metal thin film layer is pressure sensitive. It is characterized in that an adhesive layer is formed and a printing layer is directly formed on the upper layer of the film.

[For production]

In the present invention, since a fluorine-containing film is used, it is more flexible than a polyester film, can prevent wrinkles and peeling when attached to a curved surface, and has excellent workability. In addition, it has sufficient heat resistance of about 150°C, and when baking paint is applied, the metal thin film layer is not destroyed and the desired gloss is exhibited.

On the other hand, if it is a single layer of fluorine-containing film, the film will repel ink components, so it will not be possible to print on its surface, or even if it is possible to print, the adhesion will be extremely poor and it will not work when external force is applied to the printing layer. , it peels off easily.

Therefore, especially in the second invention, peeling of the printed layer can be prevented by forming the film by two-layer coextrusion, selecting a resin with excellent printability for the upper layer, and printing directly on the upper layer. . Furthermore, since the lower layer is made of a heat-resistant polyvinyl fluoride resin, thermal destruction of the metal thin film layer provided thereunder can be prevented, and curved surfaces can be adhered well.

[Specific structure of the invention]

The present invention will be explained in more detail below.

FIG. 1 shows a first embodiment, in which a fluorine-containing film 1 is used as a base material, a metal thin film layer 2 is formed on the lower surface of the film, and a pressure-sensitive adhesive layer 3 is further provided on the lower surface of the fluorine-containing film 1. , which is protected by a release layer 4.

Furthermore, if necessary, a metal thin film layer 2A may be formed on the upper surface of the fluorine-containing film l, and a printed layer 5 may also be formed, in order to further enhance the metallic luster. here,
When the substrate is a single layer of fluorine-containing film l, the printing layer 5 cannot or is not suitable to be formed directly thereon, but by interposing the metal thin film layer 2A,
The printed layer 5 can be formed with sufficient adhesion.

FIG. 2 shows a second embodiment, in which the fluorine-containing film l has a polyvinyl fluoride resin i1A, for example, a polyvinylidene fluoride resin layer as the lower layer, and the upper layer is a resin layer IB having better printability than the lower layer. For example, it is an acrylic resin layer, and furthermore, a printing layer 5 is directly formed on the upper layer IA.

The fluorine-containing film according to the present invention includes polyvinyl fluoride, polyvinylidene fluoride, etc.; or a copolymer of these with ethylene, propylene hexafluoride, etc.; or a mixture thereof with acrylic resin, vinyl chloride resin, etc. can be used.

In addition, as a polyvinyl fluoride resin according to the present invention,
Similar materials can be used. Furthermore, resins that have better printability than polyvinyl fluoride resins include those that have a higher content of acrylic resins and vinyl chloride resins, which have the effect of increasing printability than the materials listed above, as well as acrylic resins, vinyl chloride resins, and chloride resins. Single-component resins such as vinylidene resins and urethane resins may be used.

The coextruded 2N film according to the invention can be obtained according to conventional methods.

The thickness of the fluorine-containing film or coextruded two-layer film is preferably (1) to 150 μm from the viewpoint of adhesion to curved surfaces, and the thickness of the pressure-sensitive adhesive layer is preferably (1) to 50 μm. The thickness of the metal thin film layer is preferably 20 μm or less.

Materials for the metal thin film layer include aluminum, chromium, titanium,
Stainless steel, etc. can be mentioned, and in its formation, an appropriate method such as a vacuum evaporation method, a sputtering method, a hot stamping method, etc. can be adopted, but in particular, vacuum evaporation using an electrobeam has high adhesion and heat resistance. It was confirmed.

As the pressure-sensitive adhesive layer and the release layer, known ones are sufficient.

FIG. 3 shows a third embodiment, in which a flexible cushioning sheet 6 made of urethane resin or the like is provided on the lower surface of the pressure-sensitive adhesive layer 3 in the second embodiment, and a second angry pressure adhesive layer is further provided on the lower surface thereof. 3A was formed. According to this aspect, when a squeegee with a sharp tip is used when pasting the metallic luster, the part located at the tip of the squeegee is locally stretched, and the vapor deposited (metal thin film) layer is It will not break down and look like cracks, which will not damage the appearance. This is thought to be due to the stress being buffered in the area to both pressure sensitive adhesives 3.3.

FIG. 4 shows a modification of the first embodiment, in which a pressure-sensitive adhesive layer 3B is provided on the upper surface of the fluorine-containing film 1 to
．． A chipping-resistant sheet 7 made of urethane resin or the like with a thickness of about 5 mm is provided to protect the painted surface from pebbles, sand, etc. thrown up as the wheels rotate.

〔Example〕

The effects of the present invention will be clarified below through examples.

(Example 1) Differences in properties were investigated based on differences in base materials made of various materials.

Heat Resistance> The following nine types of films were subjected to chromium vapor deposition, and an adhesive (*) was coated on the vapor-deposited surface to a thickness of 2.5 μm, dried, and a piece of paper was pasted to form a sample. Squeegee the sample cut into 50mm x 50mm onto an acrylic/melamine coated iron plate.
For pasting, acrylic/melamine clear paint was applied by spraying to a dry film thickness of 30 μm, and after being left at room temperature for 20 minutes, it was heated at 150° C. for 40 minutes to examine changes in appearance.

a) PVC film Riken Vinyl Kogyo semi-rigid PVC calendar film (
60μ) was used.

b) Acrylic film “Acryprene HBAJ (50μ Mitsubishi Rayon @
)It was used.

C) Urethane film "Elfan UHJ ((1) 0μ Nippon Matai@) was used.

d) Polypropylene film r50RXc-7J (50μ Higashishanaguchi Chemical (horizontal) e
) Ethylene-vinyl alcohol copolymer film “EVAL EF-XLJ (15μ (scooping) f
) Tetrafluoroethylene copolymer film "Afflex" (50μ Asahi Glass IN1) g) Tetrafluoroethylene copolymer film
Hexafluoropropylene copolymer film "Neoflon FEP film" (50μ Daikin Industries@) h) Polyvinyl fluoride film rTEouH<25μ DuPont) i) Polyvinylidene fluoride film [Denka DX-144 (50μ Denki Kagaku Kogyo a) j) Chrome-deposited polyester film (comparative example) (*)
A flask was charged with 92 parts by weight of adhesive 2-ethylhexyl acrylate, 8 parts by weight of acrylic acid, and 1150 parts by weight of ethyl acetate/toluene-1, heated to 70°C with stirring while blowing N2 gas, and benzoyl peroxide. 0.3 parts by weight was added and 11 parts of Desmodur L was added and mixed in a solid content ratio of 1.0ff to 0 parts by weight of the adhesive solution (1) obtained by reaction for 5 hours.

The results are shown in Table 1.

Table 1 It can be seen that the heat resistance of fluorine-containing films, including polyester films, is 150°C or higher.

The samples in a) to j) above were prepared in the same manner except that the size and shape were changed to circular shapes with a radius of 25 mm, and each sample was attached to a spherical glass flask with a diameter of about 150 mm using a squeegee. , and examined whether there were wrinkles or peeling.

Table 2 <Ink adhesion> Room temperature curing two-component urethane screen printing ink (Roppon Kagaku (11J)) was printed on the vapor deposited side and the non-vapor deposited side of each film, and after being left at room temperature for 24 hours, a cutter was applied to the printed surface. After making a scratch with a knife, we applied cellophane tape and examined whether the ink would peel off when it was suddenly removed.The results are shown in Table 3.

Table 3 Most of the fluorine-containing films do not adhere well to ink unless they are subjected to corona treatment, but Denka DX-14 adheres well without being treated because it contains an acrylic resin. In addition, the adhesion of the ink to the deposition surface was good, and the deposited film itself exhibited an excellent anchoring effect.

〔Effect of the invention〕

As described above, according to the present invention, a metallic luster sheet having excellent heat resistance, adhesion to curved surfaces, and printability can be obtained.

[Brief explanation of the drawing]

1 to 4 are side cross-sectional views of the layer structure in each example. l...Fluorine-containing film, lA...polyvinyl fluoride resin, IB...resin layer with excellent printability, 2゜2A, 2B...metal thin film layer, 3.3A...pressure sensitive Adhesive layer, 5...printing layer. Figure 1 Figure 2

Claims (4)

[Claims] (1) A metallic luster adhesive sheet characterized by having a metal thin film layer on at least one side of a fluorine-containing film and a pressure-sensitive adhesive layer. (2) The first metal thin film layer is formed directly on the fluorine-containing film by vacuum deposition or sputtering.
Metallic luster adhesive sheet as described in section. (3) The metallic gloss adhesive sheet according to item 1, wherein the metal thin film layer is formed on the fluorine-containing film by hot stamping via a heat-melting adhesive layer. (4) A thin metal film layer is interposed on at least the lower surface of a two-layer film coextruded with a polyvinyl fluoride resin as the lower layer and a resin with better printability as the upper layer, and a pressure-sensitive adhesive layer is placed on the lower surface of the thin metal film layer. 1. A metallic luster sheet comprising: a printed layer formed directly on the upper layer of the film.