JPH05309996A - Transfer film containing brightnening agent - Google Patents

Abstract

PURPOSE:To enhance flip-flop properties by forming a colored layer into two layers of both an upper layer having thin film thickness in the surface side and a lower layer having thick thickness in the rear side and also incorporating a flaky brightening agent into at least the upper layer in a transfer film constituted by laminating a pressure-sensitive adhesive layer, a colored layer and a clear layer. CONSTITUTION:A transfer film is formed by equipping a pressure-sensitive adhesive layer 1, a colored layer 2 provided in the surface side from the layer 1 and a clear layer 3 provided in the surface side from the layer 2. The colored layer 2 is formed into two layers of an upper layer 2a having thin film thickness in the surface side and a lower layer 2b having thick film thickness in the rear side. Moreover a flaky brightening agent 4 (i.e., Al powder) is incorporated into at least the upper layer 2a. The brightening agent 4 is orientated so that the flat face thereof is made parallel to the surface of the layer within the upper layer 2a having thin film thickness. Further even when the upper layer 2a of the colored layer 2 is thinly formed in such a way, masking properties are secured by the lower layer 2b having thick film thickness. As a result, flip-flop properties are enhanced wherein the transfer film is made glittery and black in the direction of observation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glittering agent-containing transfer film used by being stuck on an automobile or the like.

[0002]

2. Description of the Related Art In painting an automobile, a transfer film is attached instead of applying the paint. Then, a glittering agent-containing transfer film is provided as a transfer film for adapting to metallic coating. This glittering agent-containing transfer film is formed by laminating a clear layer on the front surface side of the colored layer and laminating a pressure-sensitive adhesive layer on the back surface side of the colored layer, and stretching a release film on the pressure-sensitive adhesive layer. The colored layer contains a brightening agent such as aluminum powder or mica powder. The glittering agent contained in the colored layer expresses a metallic glitter effect.

As described above, in order to express a metallic glittering feeling with the brightening agent, it is desired that the flip-flop property is high. The flip-flop property is highly glittering when the painted surface is viewed from a vertical direction, but it looks like it looks dark when the painted surface is viewed from an oblique direction. When a transfer film containing a glittering agent is pasted along the curved surface of the, if such a flip-flop property is high, there will be a part with high glitter and a part that looks dark depending on the curved surface. Can enhance the stereoscopic effect of the car body.

[0004]

As a conventional glittering agent-containing transfer film, "a metallic-like pressure-sensitive adhesive sheet having excellent brilliance" is provided in JP-B-61-53396 and JP-B-62-25198. , "Pearl-like sheet with excellent brightness" provided in JP-A-63-58483. However, when a glittering agent-containing transfer film is prepared by containing a glittering agent in the coloring layer as described above, the glittering agent is randomly oriented in the coloring layer, and even when viewed from a direction perpendicular to the coloring layer. There is a problem that the orientation of the glittering agent does not change even when viewed in an oblique direction, and the flip-flop property cannot be obtained high.

The present invention has been made in view of the above points, and an object of the present invention is to provide a glittering agent-containing transfer film capable of obtaining a high flip-flop property.

[0006]

The glittering agent-containing transfer film according to the present invention comprises a pressure-sensitive adhesive layer 1, a colored layer 2 on the front side of the adhesive layer 1, and a clear layer 3 on the front side of the colored layer 2. In the transfer film formed as described above, the colored layer 2 includes the upper layer 2a having a thin film thickness on the front surface side and the lower layer 2b having a large film thickness on the back surface side.
And a scale-like brightening agent 4 are contained in at least the upper layer 2a.

Further, in the present invention, the upper layer 2a of the coloring layer 2
Is formed with a film thickness of 1 to 5 μm. Further, in the present invention, the lower layer 2b of the colored layer 2 is applied by a knife coater to form a smooth surface. Hereinafter, the present invention will be described in detail.

FIG. 1 shows an example of the glittering agent-containing transfer film according to the present invention. The pressure-sensitive adhesive layer 1 is laminated on the surface of the release film 10 and the colored layer 2 is laminated on the surface of the pressure-sensitive adhesive layer 1. Then, a clear layer 3 is formed on the surface of the colored layer 2.
Are laminated to have a thickness of about 80 to 150 μm. An application film 11 is stretched on the surface of the clear layer 3 as needed.

The release film 10 may be a PET film having a thickness of about 30 to 50 μm, which has a release treatment on one side, and the adhesive layer 1 may contain an acrylic or rubber adhesive. It can be formed by coating the release surface of the release film 10 with a thickness of about 200 μm. In the present invention, the colored layer 2 is formed in two layers, that is, an upper layer 2a having a small thickness on the front surface side and a lower layer 2b having a large thickness on the back surface side, and the film thickness of the upper layer 2a having a small thickness is 1 to 5 μm. It is set to the range. The thickness of the lower layer 2b is not particularly limited, but it is preferably set to a film thickness of 10 to 30 μm. Upper layer 2a and lower layer 2 of coloring layer 2
Although b can be formed by applying a coating material prepared by mixing the brightening agent 4, the lower layer 2a is a coating material prepared by mixing the pigment without the brightening agent 4 as shown in FIG. It may be formed. As the brightening agent 4, a flaky aluminum powder, a flaky mica powder, or the like is used, and the particle size (diameter on a flat surface) is the upper layer 2.
It is preferably 1 to 200 μm, which is about the same as or larger than the dimension of the film thickness of a.

Here, as described above, the upper layer 2a of the coloring layer 2 is formed.
4 is formed as thin as 1 to 5 μm, the glittering agent 4 cannot be perpendicular to the surface of the upper layer 2a.
As shown in (a), the plane will be oriented so that the plane is parallel to the surface of the layer. The glittering agent 4 is thus oriented parallel to the surface of the upper layer 2a regardless of the coating method. FIG. 5A shows the upper layer 2a using the knife coater 5.
In this example, the brightening agent 4 is not oriented in the coating material 12 but is randomly oriented in the coating material 12. However, the coating material 12 is thinly spread by the knife coater 5 to form a thin upper layer. When 2a is formed, the upper layer 2a having a small film thickness
In the inside, the glittering agent 4 cannot be randomly oriented, and is oriented so that its plane of deflection is parallel to the surface of the upper layer 2a.
FIG. 5 (b) shows an example in which spray coating is performed. In the particles 12a of the sprayed paint 12, the glittering agent 4 is not oriented but randomly oriented. When the coating material 12 adheres to the surface of the adherend and the coating material 12 flows along the surface of the adherend to form the thin upper layer 2a, the glittering agent 4 cannot randomly face in the thin upper layer 2a, and the unevenness of The plane is oriented so as to be parallel to the surface of the upper layer 2a. When the plane of the brightening agent 4 is oriented so as to be parallel to the surface of the upper layer 2a, light is mainly emitted by the brightening agent 4 as shown by the arrow in FIG.
A small amount of light is reflected in a direction perpendicular to, and reflected in a direction inclined with respect to the upper layer 2a. Therefore, when the upper layer 2a is viewed from a vertical direction such as a, the glittering amount is large because the amount of light reflected by the brightening agent 4 is large, but when the upper layer 2a is viewed from an oblique direction such as a, the amount of reflected light is small. As a result, it looks blackish and it is possible to obtain a high flip-flop property. By the way, when the film thickness is large and the brightening agent 4 is not oriented but randomly oriented, the light is reflected by the brightening agent 4 in a random direction as shown in FIG. The brightening agent 4 can be seen from the vertical direction as shown in FIG.
There is not much difference in the amount of light reflected at, and they look the same, and the flip-flop property cannot be obtained.

If the upper layer 2a is formed thin in order to obtain the flip-flop property, the effect of hiding the underlying layer may not be obtained. For this reason, in the present invention, the colored layer 2 is formed of the upper layer 2a and the lower layer 2b so that the thickness of the lower layer 2b is increased, and the entire thickness of the colored layer 2 is secured to obtain the concealing property of the base. You can do it.

The clear layer 3 is formed by coating a transparent resin such as acrylic resin, polyester, polyurethane, polyvinyl fluoride, polyvinyl chloride or the like, or laminating a transparent film to a thickness of about 20 to 100 μm. You can Further, the application film 11 stretched as necessary is formed of an arbitrary transparent resin film, and after the release film 10 is peeled off and the glittering agent-containing transfer film is attached to the surface to be coated with the adhesive layer 1, The application film 10 is peeled off from the glittering agent-containing transfer film.

Next, an example of a method for producing the glittering agent-containing transfer film according to the present invention will be described. First, a release agent is applied to one side of the carrier film 14 formed of a PET film or the like to perform a release treatment, and a clear resin is applied to the release-treated surface of the carrier film 14 to laminate the clear layer 3 ( FIG. 3A). Next, a coating material containing the scale-like brightening agent 4 is applied on the clear layer 3 by an air spray, a knife coater or the like to provide the upper layer 2a and further the upper layer 2
A lower layer 2b is provided by coating with a knife coater (including a doctor blade) on a, and the colored layer 2 including the upper layer 2a and the lower layer 2b is laminated on the clear layer 3 (FIG. 3 (b)). Here, the lower layer 2b has a smooth surface formed by applying it with a knife coater in this way, so that the glittering agent-containing transfer film can be formed smoothly. By the way, when spray painting is applied, cancerous skin appears and the smoothness becomes poor. On the other hand, a pressure-sensitive adhesive is applied to the release film 10 formed of a PET film or the like having the surface subjected to a release treatment to laminate the pressure-sensitive adhesive layer 1 (FIG. 3C).
Then, the glittering agent-containing transfer film can be obtained by stacking the pressure-sensitive adhesive layer 1 on the colored layer 2 formed as described above and laminating it (FIG. 3D). Finally, the carrier film 14 can be finished by reattaching it to the stiff application film 11.

[0014]

EXAMPLES Next, the present invention will be specifically described by way of examples. (Example 1) A two-pack type polyurethane clear resin ("nax mighty rack GII240 manufactured by Nippon Paint Co., Ltd."
Clear "and" nax mighty rack hardener "were mixed in a ratio of 4: 1) and the dry film thickness was 40 μm.
The clear layer of was formed (FIG. 3 (a)). Next, urethane-based paint containing scale-like aluminum powder (“nax mighty rack GII silver” manufactured by Nippon Paint Co., Ltd.)
And "nax mighty rack hardener" are mixed in a ratio of 4: 1) to form an upper layer by air-spraying so that the dry film thickness is 3 to 5 μm, and after curing, the same paint is applied on this knife coater. 3 mils (75 μm)
To form a lower layer having a dry film thickness of 30 μm,
Colored layers composed of an upper layer and a lower layer were laminated (FIG. 3 (b)).
On the other hand, an acrylic adhesive (“SKDyne 1604N” manufactured by Soken Chemical Co., Ltd.) was applied to one side of a release film made of a release-treated PET film in a thickness of 30 μm to form a release agent layer. (FIG.3 (c)). Then, the colored layer and the pressure-sensitive adhesive layer were pressure-bonded and laminated to obtain a glittering agent-containing transfer film (FIG. 3D).

(Embodiment 2) Thickness 38 μm after release treatment
Two-component type polyvinyl chloride-polyvinyl acetate clear resin on the PET film of "(Polyvinyl chloride-polyvinyl acetate resin manufactured by Asahi Denka Co., Ltd." Denka Rack 61N "75
Parts, xylene 17 parts, and butyl acetate 8 parts were mixed to prepare a clear layer having a dry film thickness of 40 μm.
Next, a polyvinyl chloride-based paint mixed with scale-like pearl mica pigment to a pigment concentration of 10% has a dry film thickness of 5 μm.
To form an upper layer by air spray coating, and after curing, apply a polyvinyl chloride-based paint mixed with a phthalocyanine blue pigment to a pigment concentration of 10% with a knife coater to obtain a dry film thickness. A lower layer having a thickness of 30 μm was formed, and colored layers composed of an upper layer and a lower layer were laminated. Thereafter, a glittering agent-containing transfer film was obtained in the same manner as in Example 1.

(Comparative Example 1) In Example 1, the upper layer and the lower layer were not separately provided to form the colored layer, but were applied at once with a knife coater to form the colored layer having a thickness of 35 μm. Others were the same as in Example 1. (Comparative Example 2) In Example 1, except that the upper layer and the lower layer were not separately provided to form the colored layer, but they were applied at once by an air spray to form the colored layer having a thickness of 35 μm. Same as Example 1.

With respect to the glittering agent-containing transfer films obtained in Examples 1 and 2 and Comparative Examples 1 and 2, the sharpness, glossiness and flip-flop property were measured, and the smoothness was visually observed. The sharpness is measured by the portable sharpness glossmeter PGD-1.
The measurement was performed by measuring the PGD value using V (manufactured by Tokyo Koden Co., Ltd.). The larger the PDG value, the higher the definition. The glossiness was measured by measuring 20 ° gloss using a digital variable angle gloss meter UGV5K (manufactured by Suga Test Instruments Co., Ltd.). The larger the value of 20 ° gloss, the better the gloss. Further, the flip-flop property was measured by using a goniochromaticity meter (manufactured by Murakami Color Research Laboratory) with an incident angle of 0.
The L value at a reflection angle of 10 ° (L ₁₀ °) and the L value at an incident angle of 0 ° / reflection angle of 80 ° (L ₈₀ °) were measured, and the flip-flop value = L ₁₀ ° / L ₈₀ ° was measured. .. The larger the flip-flop value, the higher the flip-flop property. The results are shown in the following table.

[0018]

[Table 1]

As can be seen from the results in the table, it is confirmed that each of the examples has a high flip-flop value and excellent flip-flop property. Further, when spray painting is performed as in Comparative Example 2, smoothness becomes poor, whereas Comparative Example 1
It is confirmed that the smoothness is improved by applying the coating with the knife coater as described above.

[0020]

Industrial Applicability As described above, the present invention provides a transfer film comprising a pressure-sensitive adhesive layer, a colored layer on the front side of the pressure-sensitive adhesive layer, and a clear layer on the front side of the colored layer. Since the upper layer having a small thickness on the front surface side and the lower layer having a large thickness on the back surface side are formed into two layers and at least the scale-like brightening agent is contained in the upper layer, the brightening agent is contained in the thin upper layer. The plane will be oriented so that it is parallel to the surface of the layer, and the brightener mainly reflects the light in a direction perpendicular to the upper layer, while less light is reflected in the inclined direction. This makes it possible to obtain a high flip-flop property in which the glitter feeling becomes higher or the color becomes darker. Moreover, even if the upper layer of the colored layer is formed so thin, the hiding property can be secured by the lower layer having a large film thickness.

Further, since the lower layer of the colored layer is formed by coating with a knife coater, it can be formed as a layer having a smooth surface with a knife coater, which enhances the smoothness of the glittering agent-containing transfer film. Can be done.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of another embodiment of the present invention.

FIG. 3 shows an example of production of a glittering agent-containing transfer film according to the present invention, in which (a) to (d) are cross-sectional views, respectively.

FIG. 4 is a view for explaining a flip-flop property,
(A) is a cross-sectional view of a high flip-flop property,
(B) is a cross-sectional view of a flip-flop having a low property.

5A and 5B are views for explaining the orientation of the glittering agent, FIG. 5A is a sectional view of a knife coater, and FIG. 5B is a sectional view of spray coating.

[Explanation of symbols] 1 adhesive layer 2 colored layer 2a upper layer 2b lower layer 3 clear layer 4 brightener

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Fujii 19-17 Ikedanaka-cho, Neyagawa-shi, Osaka Japan Paint Co., Ltd.

Claims (3)

[Claims] 1. A transfer film comprising a pressure-sensitive adhesive layer, a colored layer on the front side of the pressure-sensitive adhesive layer, and a clear layer on the front side of the colored layer, wherein the colored layer is a thin upper layer on the front side. And a lower layer having a thicker film on the back surface side, and a scale-like brightening agent is contained in at least the upper layer, and the brightening agent-containing transfer film is characterized in that. 2. The glittering agent-containing transfer film according to claim 1, wherein the upper layer of the coloring layer has a film thickness of 1 to 5 μm. 3. The glittering agent-containing transfer film according to claim 1, wherein the lower layer of the coloring layer is applied by a knife coater to form a smooth surface.