JPS6241869B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an iris-colored retroreflective material and a slit thread thereof.

It has been known to weave retroreflective threads into stage costumes and the like in order to impart reflectivity (see Publication No. 39-27759). This retroreflective thread is made by winding a tape-like material with a reflective film on one side of a transparent synthetic resin film containing glass microspheres. However, the reflective film in this retroreflective thread is a metal film or the like, and there is a drawback that the retroreflected light is monotonous.

SUMMARY OF THE INVENTION In view of the above-mentioned points, the present invention provides a retroreflective thread that emits a richly colored retroreflected light and has an even better decorative effect.

That is, in the present invention, an iris layer made of an iris material layer and not containing a metal layer is formed on at least one side of a flexible base material, a transparent resin layer is formed thereon, and glass microspheres are formed on the transparent resin layer. The present invention provides an iris-colored retroreflective material that is held, and an iris-colored retroreflective slit thread that is obtained by slitting the material.

In the present invention, the light incident on the glass microspheres held in the transparent resin layer passes through them and enters the iris layer, is reflected there, passes through the glass microspheres again, and exits to the outside, so retroreflected light It has an iridescent color and its decorative effect is greatly improved. However, the retroreflective material of the present invention can be cut into appropriate sizes and pasted onto stage costumes, etc., while the slit thread can be used by weaving it into stage costumes, etc. to achieve excellent decorative effects. It is something that can be demonstrated.

Next, the present invention will be explained based on the drawings. 1st
The figure is a partial sectional view showing one embodiment of the iris-colored retroreflective material of the present invention, and FIG. 2 is a partial sectional view showing another embodiment.

In the material shown in FIG. 1, an iris layer 2 is formed on one side of a flexible base material 1, and a transparent resin layer 3 holding glass microspheres 4 is formed thereon.
The material shown in FIG. 2 has an iris layer 2 on both sides of a flexible base material 1.
A transparent resin layer 3 holding glass microspheres 4 is formed on the iris layer 2. The material shown in FIG. 1 receives iris-colored retroreflected light only on one side, and the material shown in FIG. 2 receives iris-colored retroreflected light on both sides.

As the flexible base material 1, a synthetic resin film, paper, a laminate of a synthetic resin film and paper, etc. are used as appropriate. Examples of the synthetic resin film include polyester film, polyamide film, polypropylene film, polyethylene film, polycarbonate film, polyvinyl chloride film, etc., and the thickness is 2 to 2.
A material of about 100μ is used. As the paper, Japanese paper or Western paper with a weight of about 10 to 55 g/m ² is used, and Japanese paper is usually preferred. When using paper,
In order to smooth the surface and improve adhesion to the iris layer 2, an undercoat layer of epoxy resin, alkyd resin, urethane resin, etc. is usually provided. Even when a synthetic resin film is used, it is preferable to provide an undercoat layer if the adhesion to the iris layer 2 is poor.

The iris layer 2 is a single-layer thin film or a laminated thin film of one or more iris substances such as copper iodide, lead bromide, magnesium fluoride, zinc sulfide, antimony oxide, aluminum fluoride, and titanium oxide. These thin films are formed by vapor deposition methods (including vacuum evaporation methods, sputtering methods, ion plating methods, etc., the same applies hereinafter), but titanium oxide is formed from titanium tetrachloride by vapor phase chemical deposition methods. may be formed. The thickness of these thin films is usually 5~
It is about 200mμ.

The resin for the transparent resin layer 3 holding the glass microspheres 4 may be one of thermosetting resins such as alkyd resin, amino resin, urethane resin, epoxy resin, thermosetting acrylic resin, or a mixture thereof, nitrocellulose, or acrylic. Thermoplastic resins such as vinyl chloride resins, vinyl acetate resins, mixtures thereof, mixtures of the above-mentioned thermosetting resins and thermoplastic resins, etc. can be used as appropriate. The transparent resin layer 3 may be uncolored or colored.
The thickness of the transparent resin layer 3 depends on the size of the glass microspheres 4, but is usually about 13 to 300 microns.

Glass microspheres 4 having a refractive index of about 1.7 to 2.4 and an average particle size of about 20 to 150 μm are preferably used because of their excellent retroreflectivity. The glass microspheres 4 may be completely buried in the transparent resin layer 3, but in order to improve retroreflectivity, it is preferable that about 1/3 to 2/3 be exposed from the resin layer 3. Therefore, it is preferable that the diameter of the glass microspheres 4 is approximately 2/3 to twice the thickness of the resin layer 3. Further, from the viewpoint of improving retroreflectivity, it is preferable to arrange the glass microspheres 4 as densely as possible, but if uneven retroreflection is desired, they may be arranged sparsely.

In order to obtain a transparent resin layer 3 in which the glass microspheres 4 are completely embedded, a resin solution containing the glass microspheres 4 may be applied onto the iris layer 2 and dried. To remove the transparent resin layer 3 in which a portion of the glass microspheres 4 are exposed, a resin solution is applied onto the iris layer 2, and while the coating layer is still soft, glass microspheres 4 are scattered to remove the glass microspheres. It may be allowed to sink into the coating layer due to its own weight in Step 4, and then dried.

On the transparent resin layer 3 holding the glass microspheres 4, a top coat layer 5 of an uncolored or colored resin may be provided with a suitable resin, as shown in FIG.

In the present invention, as shown in FIG. 4, a flexible base material 1' is constructed by bonding the above-described flexible base material 1 with an adhesive layer 6 interposed therebetween, and an iris layer 2 and glass are provided on both sides of the flexible base material 1'. Transparent resin layer 3 holding microspheres 4
It is also possible to have a configuration in which A retroreflective material having such a structure is usually produced by preparing a retroreflective material in advance as shown in FIG. 1 or 3 and forming it into a two-ply structure.

By slitting the various iris-colored retroreflective materials described above, the iris-colored retroreflective slit yarn of the present invention can be obtained.
The width of the slit thread is usually about 0.15 to 3 mm. This slit thread may be used as it is, or it may be used as a twisted gold and silver thread by round twisting it with other fiber threads, or by performing Hagoromo twisting, Tasuki twisting, etc. .

Alternatively, a pattern may be expressed in advance before slitting the various iris-colored retroreflective materials, and the material may be used as a foil to reproduce the pattern in the fabric structure during weaving.

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

Example 1 A deposited layer of copper iodide with a thickness of 25 μm was formed on one side of a polyethylene terephthalate film with a thickness of 12 μm by vacuum evaporation, and a melamine-alkyd resin solution was applied thereon, and while the applied layer was still soft, Glass microspheres with an average particle size of 50μ and a refractive index of 2.3 are scattered over the entire surface, and allowed to sink by about half the diameter due to their own weight.The coated layer is then dried and solidified until the glass microspheres are exposed to about half the diameter. An iris-colored retroreflective material was fabricated by forming a transparent resin layer with a thickness (maximum thickness) of approximately 40μ.

Example 2 The retroreflective material obtained in Example 1 was slit to a width of 1.5 mm using a micro slitter to obtain an iris-colored retroreflective slit thread.

The retroreflective materials and slit threads obtained in Examples 1 and 2 all exhibited retroreflected light with iris luster, and their decorative effects were extremely excellent.

[Brief explanation of the drawing]

1 to 4 are partial cross-sectional views showing respective examples of the iris-colored retroreflective material of the present invention. (Main symbols in the drawing), 1, 1′: flexible base material,
2: iris layer, 3: transparent resin layer, 4: glass microspheres, 5: top coat layer.

Claims (1)

[Scope of Claims] 1. An iris layer made of an iris material layer and containing no metal layer is formed on at least one side of a flexible base material, a transparent resin layer is formed thereon, and a glass microscopic layer is formed on the transparent resin layer. An iris-colored retroreflective material that holds a sphere. 2. The material according to claim 1, wherein the glass microspheres are held so that a portion of the glass microspheres are exposed from the transparent resin layer. 3. The material according to claim 2, wherein a top coat layer is formed on the transparent resin layer where the glass microspheres are exposed. 4. An iris layer made of an iris material layer and containing no metal layer is formed on at least one side of the flexible base material, a transparent resin layer is formed thereon, and glass microspheres are held in the transparent resin layer. Iris-colored retroreflective slit thread made by slitting a strip. 5. The slit yarn according to claim 4, wherein the glass microspheres are held so that a portion thereof is exposed from the transparent resin layer. 6. The slit yarn according to claim 5, wherein a top coat layer is formed on the transparent resin layer where the glass microspheres are exposed.