JPS6331602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a retroreflective decorative body using a novel high-frequency processable retroreflective sheet.

[Prior art and problems to be solved by the invention] Conventionally, it has been known that retroreflective sheets have been applied to road signs, license plates, sticker cars, etc., but all of these are flat. . Since conventional retroreflective sheets do not have high-frequency processability, that is, high-frequency fusing and welding properties, it has been almost impossible to use them as accessories, for example. Therefore, in order to produce decorations using conventional retroreflective sheets, printing is applied to the surface of the retroreflective sheet to enhance the decorative effect, but the decorative effect of such colors is only two-dimensional. It is monotonous and lacks variety, making it unsatisfactory as a decorative object such as an accessory.

However, the present inventors have discovered a novel retroreflective sheet that has high-frequency processability that conventional retroreflective sheets do not have, and when this is used as an outer cover and is high-frequency cut and welded to a decorative base material, it has an excellent accessory effect. The inventors discovered a new fact that it is possible to obtain a decorative body with a three-dimensional shape, and completed the present invention.

[Means for Solving the Problems] That is, the present invention stacks a resin foam on a decorative base material, and further layers a first soft vinyl chloride film, a first adhesive layer, a resin layer, and a focal resin layer. , a metal vapor deposition layer, a second adhesive layer, and a second soft vinyl chloride film are laminated in this order, and the resin layer includes glass microspheres so that a portion of the glass microspheres is exposed on the focal resin layer side. The focusing resin layer is formed such that a portion corresponding to the exposed portion of the glass microspheres constitutes a hemisphere covering the exposed portion, and the metal vapor deposited layer is embedded in the focusing resin layer. A high frequency processable retroreflective sheet is formed such that the portion corresponding to the hemispherical portion of the layer forms a hemispherical boundary surface covering the hemispherical portion, and a second soft vinyl chloride film is placed on the side of the resin foam. Stack them so that they come together.
The present invention relates to a retroreflective decorative body having a three-dimensional outer skin, which is formed by high-frequency fusing and welding.

[Example] First, the high frequency processable retroreflective sheet used in the present invention will be explained with reference to the drawings. FIG. 1 is a schematic sectional view showing a preferred embodiment of the retroreflective sheet used in the present invention. In FIG. 1, 1 is a first soft vinyl chloride film, 2 is a first adhesive layer, 3 is a resin layer, 4 is a glass microsphere, 5 is a focal resin layer, 6 is a metal vapor deposited layer, and 7 is a first adhesive layer. 2 is an adhesive layer, and 8 is a second soft vinyl chloride film. This retroreflective sheet exhibits retroreflection when viewed from the first soft vinyl chloride film 1 side.

The first soft vinyl chloride film 1 and the second soft vinyl chloride film 8 are high frequency melt cut,
A material that is easy to weld and has a soft surface is preferred. From this point of view, polyvinyl chloride
20 parts of plasticizer per 100 parts (by weight, same below)
~60 parts of soft chloride obtained from externally plasticized polyvinyl chloride and internally plasticized polyvinyl chloride such as vinyl chloride-vinyl acetate copolymer copolymerized with 100 parts of vinyl chloride and 20 to 60 parts of vinyl acetate. Vinyl film is particularly preferably used.
The thickness of the soft vinyl chloride film is not particularly limited, but it is usually preferably used that has a thickness of about 50 to 800 microns.

Desired printing or embossing may be applied to the front or back surface of the first soft vinyl chloride film 1, thereby further enhancing the decorative effect.

As the adhesive for forming the first adhesive layer 2 and the second adhesive layer 7, it is preferable to use an adhesive having good fusing properties during high frequency processing. Examples of such adhesives include polyamide-based, polyvinyl chloride-based, polyacrylic ester-based, and urethane resin-based adhesives. The adhesive layer is usually provided to a thickness of about 2 to 5 microns.

The main purpose of the resin layer 3 is to hold and fix the glass microspheres 4, and the glass microspheres 4 must not move due to heat applied during high frequency processing. From this point of view, it is preferable to use a thermosetting resin. Examples of thermosetting resins used include alkyd resins, urea resins, melamine resins,
Examples include urethane resins, epoxy resins, thermosetting acrylic resins, and these may be used alone or in combination. Further, a thermoplastic resin may be appropriately blended with the thermosetting resin within a range that does not impair the above purpose. The thickness of the resin layer 3 is glass microspheres 4
It is determined by how much is exposed from the resin layer 3. In order to obtain excellent retroreflectivity, it is preferable to expose about 1/3 to 2/3 of the glass microspheres 4, especially about 1/2. It is preferable to provide a thickness of about 1/3 to 2/3, especially about 1/2. Resin layer 3
may be colored with dyes or transparent organic pigments;
In such a case, retroreflected light of various colors can be obtained without being limited to the metallic luster of the metal vapor deposited layer 6.

As the glass microspheres 4, those having a refractive index in the range of 1.9 to 2.4 are preferably used for the purpose of obtaining excellent retroreflectivity. If the glass microspheres 4 are too small, it is difficult to form a focal resin layer with the same thickness along the spherical surface, and if they are too large, it is necessary to make the focal resin layer thicker, so it is necessary to form the focal resin layer with the same thickness along the spherical surface. In either case, wide-angle retroreflectivity is difficult to obtain. From this point of view, the size of the glass microspheres 4 is usually an average sphere diameter of 30~
Selected from a range of about 100μ. In order to obtain uniform retroreflection, it is preferable that the glass microspheres 4 be arranged as densely as possible; however, if spotty retroreflection is desired, they may be arranged roughly as appropriate.

The focusing resin layer 5 is formed so that a portion corresponding to the exposed portion of the glass microsphere constitutes a hemisphere covering the exposed portion. Here, the term "hemisphere" includes not only a complete hemisphere, but also a range from 1/3 to 2/3 of a sphere. By configuring the focusing resin layer 5 in this manner, the portion of the next metal vapor deposited layer 6 corresponding to the glass microspheres forms a hemispherical mirror surface. This configuration makes it possible to focus not only the incident rays perpendicular to the retroreflective sheet, but also the incident rays from any angle, thereby providing excellent wide-angle retroreflection performance.
The suitable thickness of the focusing resin layer 5 depends on the refractive index and diameter of the glass microspheres 4 and the refractive index of the resin surrounding the glass microspheres, but is usually selected from a range of 5 to 70 microns.

As the resin constituting the focal resin layer 5, the resin layer 3
Similar resins are used to achieve similar purposes and may be similarly colored. Note that resin layer 3
When a resin mainly composed of a thermosetting resin is used for the focal resin layer 5, cracks are likely to occur in the metal vapor deposited layer 6 of the glass microspheres 4 that come into contact with the fusion part before cutting during high frequency fusing, and therefore, the metal vapor deposit layer Despite the presence of No. 6, sparks are not generated and high frequency machinability is good.

The metal vapor deposited layer 6 is formed so that a portion corresponding to the hemispherical portion of the focusing resin layer 5 constitutes a hemispherical mirror surface covering the hemispherical portion. Metal vapor deposition layer 6
There are no particular restrictions on the metals that make up the
Examples include nickel alloy. Usually aluminum is particularly preferably used. The thickness of the metal vapor deposited layer is preferably about 0.05 to 0.1 μm. If the thickness is 0.05μ, the reflectivity is poor and it is difficult to obtain excellent retroreflectivity, and even if it is thicker than 0.1μ, the reflectivity will not improve, so anything thicker than 0.1μ is economically disadvantageous. .

The high-frequency processable retroreflective sheet used in the present invention has both sides covered with a soft vinyl chloride film that is easy to high-frequency cut and weld. Since the end face is coated with a beautiful finish, each layer is not exposed on the end face, so there is no risk of each layer peeling off from the fused part. Also, when adhesively processed to a decorative base material, it is possible to coat the end face with a beautiful finish. Since there is a soft vinyl chloride film on the side, high frequency welding can be easily performed. In addition, since the surface is coated with a soft vinyl chloride film, it has excellent robustness, maintains retroreflectivity for a long period of time, and has an excellent feel when used as an accessory. Furthermore, since the high-frequency processable retroreflective sheet used in the present invention has the above-mentioned configuration, it is an excellently flexible retroreflective sheet, and furthermore, since it has the above-mentioned specific retroreflective structure, it has excellent retroreflective ability. It is intended to be presented.

Various methods can be used to manufacture the high-frequency processable retroreflective sheet used in the present invention by changing the lamination order of each layer. The method shown in FIG. 2 is particularly preferably adopted.

In FIG. 2, 9 is a base film.
For example, the base film has a thickness of 25 to 75μ.
A polyester film of about 100% is preferably used. A resin solution is applied onto the base film 9 to form the resin layer 3. Later base film 9
is peeled off from the resin layer 3, but if the peelability is poor, a coating layer of a resin with poor adhesion, such as polyvinyl chloride or cellulose acetate, is provided on the base film 9 in advance, and the resin layer 3 is coated on top of that. may be formed. Glass microspheres 4 are sprinkled over the entire surface of the resin layer 3 while it is still soft. The glass microspheres 4 sink into the resin layer 3 due to their own weight. The degree of exposure of the glass microspheres 4 from the resin layer 3 can be adjusted by appropriately selecting the thickness of the resin layer 3 and the diameter of the glass microspheres 4. The glass microspheres 4 are then fixed to the resin layer 3 by heating and drying the resin layer 3. A resin solution is applied onto the resin layer 3 where the glass microspheres 4 are exposed and dried to form a focal resin layer 5. Although the thickness of the focal resin layer 5 is adjusted by adjusting the amount of resin solution applied, it is necessary to prevent at least the exposed portions of the glass microspheres 4 from being buried. If the glass microspheres 4 are completely buried, the metal vapor deposited layer provided next becomes flat and cannot form a hemispherical mirror surface, making it impossible to obtain excellent retroreflectivity. In this way, a focusing resin layer 5 is obtained in which the portion corresponding to the exposed portion of the glass microsphere 4 constitutes a hemisphere covering the exposed portion. Next, a metal is deposited on the focal resin layer 5 to form a metal deposited layer 6. A portion of the metal vapor deposited layer 6 corresponding to the hemispherical portion of the focal resin layer 5 constitutes a hemispherical mirror surface. Metal evaporation can be done using the usual vacuum evaporation method, sputtering method,
This is done by ion plating method etc. Apply adhesive on the metal vapor deposited layer 6 and apply the second layer.
An adhesive layer 7 is formed, and a second soft vinyl chloride resin film 8 is laminated thereon. The base film 9 is peeled off from the laminate thus obtained,
A high frequency processable retroreflective sheet is obtained by forming the first adhesive layer 2 on the exposed resin layer 3 and then laminating the first soft vinyl chloride film 1 thereon.

The retroreflective decorative object of the present invention is a three-dimensional retroreflective decorative object that utilizes the excellent retroreflective ability, excellent high frequency processability, and excellent feel of the high-frequency processable retroreflective sheet, and uses this as an outer skin. .

FIG. 3 is a schematic cross-sectional view showing one embodiment of the decorative body of the present invention. In FIG. 3, 10 is the high-frequency processable retroreflective sheet, 11 is a resin foam, and 12 is a decorative base material. As the resin foam 11, any material can be used as long as it can be cut by high frequency, welded, and easily compressed, and examples thereof include polyurethane foam, polyvinyl chloride foam, and the like. As the decorative base material 12, for example, textiles, leather, velvet, felt, resin sheets, etc. can be used as appropriate depending on the purpose.

To produce such a decorative body, the resin foam 11 is layered on the decorative base material 12, and the retroreflective sheet 10 is further layered on top of the resin foam 11 so that the second soft vinyl chloride film 8 is on the side of the resin foam 11. ,
This may be molded using a normal high frequency welder. For example, a mold having an inner shape corresponding to the outer shape of the retroreflective sheet 10 shown in FIG. 10 and the resin foam 11 are melt-cut and welded to obtain a three-dimensional decorative body having the retroreflective sheet 10 as an outer skin, as shown in FIG. The decorative body of the present invention thus obtained is used as an accessory, for example, by being hung on a hat, clothing, bag, etc., or by being sewn onto it. This product is not just an accessory, but also helps prevent traffic accidents at night. The decorative body of the present invention can be applied to the desired location at any time by applying a pressure-sensitive or heat-sensitive adhesive to the back surface of the decorative base material 12 and, if necessary, overlaying release paper thereon. It's okay.

Next, the present invention will be explained with reference to Examples.

Example After forming a coating layer of cellulose acetate with a thickness of 0.5μ on a polyethylene terephthalate film with a thickness of 25μ, 3 parts of butylated melamine resin and 1 part of castor oil modified alkyd resin were mixed in a toluene-butyl alcohol mixed solvent (3: 2 volume ratio) was applied so that the thickness after drying was 8 μm. After leaving it for a while to volatilize the solvent, the average sphere diameter
Glass microspheres of 50μ and a refractive index of 2.3 were scattered over the entire surface.
The glass microsphere sank by about half its diameter due to its own weight. The resin layer was then dried and solidified by heating. The same resin solution as above was applied onto the exposed resin layer of the glass microspheres to a dry thickness of 10 μm, and dried to form a focal resin layer. Aluminum was deposited on the focal resin layer by a vacuum deposition method to a thickness of 0.05 μm to form an aluminum deposited layer. On top of that, a urethane resin adhesive is applied to form an adhesive layer with a thickness of 3μ, and on top of that, a soft vinyl chloride film with a thickness of 200μ (40 parts of dioctyl phthalate per 100 parts of polyvinyl chloride) is applied.
(formed from a mixture of two parts) were laminated together. The polyethylene terephthalate film was peeled off from the thus obtained laminate, and an adhesive layer with a thickness of 3 μm was formed on the exposed resin layer using the same adhesive as above,
The same soft vinyl chloride film as above was laminated thereon.

The high-frequency processable retroreflective sheet thus obtained exhibited excellent retroreflectivity and had a soft surface.

Next, a sheet of polyurethane foam is layered on top of the felt, and then the high-frequency processable retroreflective sheet is layered on top of the felt, and then the high-frequency processable retroreflective sheet 10 has an inner shape corresponding to the outer shape of the high-frequency processable retroreflective sheet 10 shown in FIG. The molds were placed one on top of the other, and a high frequency voltage of 2 kW and 5 x 10 ⁷ hertz was applied while pressurizing. The high-frequency processable retroreflective sheet and the polyurethane foam were thus cut and welded to obtain a decorative body having the three-dimensional shape shown in FIG. The resulting decorative body was suitable as an accessory due to its three-dimensional shape and decorative effect.

[Effects of the invention] A retroreflective sheet with excellent high-frequency processability, retroreflectivity, and feel is layered on top of a resin foam layered on a decorative base material, and is high-frequency fused and welded. A retroreflective decorative body with a three-dimensional outer skin and an excellent feel can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a preferred embodiment of the high-frequency processable retroreflective sheet used in the present invention, and FIG. 2 is a schematic sectional view showing one embodiment of the laminate obtained during the manufacturing process of the retroreflective sheet. FIG. 3 is a schematic sectional view showing one embodiment of the decorative body of the present invention. (Symbols in drawings), 1: First soft vinyl chloride film, 2: First adhesive layer, 3: Resin layer, 4:
Glass microspheres, 5: focal resin layer, 6: metal vapor deposition layer,
7: Second adhesive layer, 8: Second soft vinyl chloride film, 9: Base film, 10: High frequency processable retroreflective sheet, 11: Resin foam, 12:
Decorative base material.

Claims (1)

[Claims] 1 Layer the resin foam on the decorative base material, and further layer the first soft vinyl chloride film, the first adhesive layer, the resin layer, the focal resin layer, the metal vapor deposited layer, the second adhesive layer, and the second adhesive layer. It has a structure in which soft vinyl chloride films are sequentially laminated, and glass microspheres are buried and arranged in the resin layer so that a part thereof is exposed on the focal resin layer side, and the focal resin layer is The part corresponding to the exposed part of the glass microsphere is formed to constitute a hemisphere covering the exposed part, and the metal vapor deposited layer is formed so that the part corresponding to the hemisphere of the focusing resin layer covers the hemisphere. A high-frequency processable retroreflective sheet formed to form a hemispherical mirror surface to be coated is stacked so that the second soft vinyl chloride film is on the resin foam side, and this is formed by high-frequency fusing and welding processing. A retroreflective decorative body with a three-dimensional outer skin.