JP2021006887A - Retroreflective film and method for manufacturing retroreflective film - Google Patents

Abstract

To provide a retroreflective film capable of enhancing designability and safety, and a method for manufacturing the retroreflective film.SOLUTION: A retroreflective film comprises a plurality of layers including an adhesive layer adhering to an adherend, a retroreflective layer, a first pigmented layer and a second pigmented layer with lower brightness than that of the first pigmented layer, in this order. The retroreflective layer retro-reflects at least a part of light having penetrated the second pigmented layer and the first pigmented layer to be made incident, toward a light source of the light.SELECTED DRAWING: Figure 3

Description

One aspect of the present disclosure relates to a retroreflective film and a method for producing the retroreflective film.

Patent Document 1 describes a retroreflective sheet. The retroreflective sheet has the property of retroreflecting the incident light in the direction of the light source as it is. The retroreflective sheet includes a top coat layer, a glass bead layer, an adhesive layer, and a mount in this order from the surface side. The glass bead layer consists of a plurality of glass beads arranged in a plane, a binder which is a synthetic resin filled between the glass beads, and a concave reflective film arranged under the glass beads. Have.

Patent Document 2 describes a retroreflective colored article. The retroreflective colored article includes a barrier layer arranged on the backing layer and the thermoplastic layer, a polymer color layer covering the barrier layer and a plurality of beads, a reflective layer arranged on the polymer color layer, and reflection. It includes a bead binding layer that covers the layer. Each of the plurality of beads is partially embedded in the thermoplastic layer between the barrier layers.

Japanese Unexamined Patent Publication No. 2017-11334 Special Table 2017-533460

By the way, in the retroreflective film, there is a case where it is desired to show a color other than black or the like at night while showing a color having low brightness such as black during the day. For example, in a moving body such as an automobile, it is required to look like a low-brightness color such as black in the daytime in order to improve the design, and when the light emitted by the vehicle lighting equipment hits at night to improve the safety. It may be required to reflect light. In this way, it is required to improve the design and safety.

The retroreflective film according to one embodiment of the present disclosure is a retroreflective film having a plurality of layers, and the plurality of layers are an adhesive layer adhering to an adherend, a retroreflective layer, and a first coloring. A layer and a second colored layer having a brightness lower than that of the first colored layer are provided in this order, and the retroreflective layer is at least a part of the light incident through the second colored layer and the first colored layer. Is retroreflective toward the light source.

The method for producing a retroreflective film according to one embodiment of the present disclosure includes a step of preparing a retroreflective layer, a step of forming a first colored layer on the retroreflective layer, and a step of forming a first colored layer on the first colored layer. The step of forming a second colored layer having a lower brightness than the first colored layer is included, and the retroreflective layer is at least a part of the light incident through the second colored layer and the first colored layer. Is retroreflective toward the light source.

According to one form of the present disclosure, design and safety can be enhanced.

FIG. 1 is a side view showing a part of an exemplary automobile to which the retroreflective film according to the embodiment is applied. FIG. 2 is a perspective view showing an exemplary automobile door to which the retroreflective film according to the embodiment is applied. FIG. 3 is a diagram schematically showing a cross section of the retroreflective film according to the first embodiment. 4 (a) and 4 (b) are diagrams schematically showing each step of the method for producing the retroreflective film of FIG. FIG. 5A is a diagram schematically showing the steps of the retroreflective film according to the second embodiment and the manufacturing method thereof. FIG. 5B is a diagram schematically showing the steps of the retroreflective film according to the third embodiment and the manufacturing method thereof. FIG. 6A is a diagram schematically showing the steps of the retroreflective film according to the fourth embodiment and the manufacturing method thereof. FIG. 6B is a diagram schematically showing the steps of the retroreflective film according to the fifth embodiment and the manufacturing method thereof. 7 (a) and 7 (b) are diagrams schematically showing the steps of the retroreflective film according to the sixth embodiment and the manufacturing method thereof. 8 (a) and 8 (b) are diagrams schematically showing the steps of the retroreflective film according to the seventh embodiment and the manufacturing method thereof. 9 (a), (b), (c) and (d) are diagrams schematically showing the steps of the method for producing a retroreflective film according to the eighth embodiment. FIG. 10A is a diagram schematically showing the retroreflective film according to the eighth embodiment. FIG. 10B is a diagram schematically showing a retroreflective film according to a ninth embodiment. 11 (a) and 11 (b) are diagrams schematically showing the steps of the retroreflective film according to the tenth embodiment and the manufacturing method thereof. 12 (a) and 12 (b) are diagrams schematically showing the steps of the retroreflective film according to the eleventh embodiment and the manufacturing method thereof. 13 (a), 13 (b) and 13 (c) are diagrams schematically showing the steps of the method for producing a retroreflective film according to the twelfth embodiment. 14 (a) and 14 (b) are diagrams schematically showing the steps of the retroreflective film according to the twelfth embodiment and the manufacturing method thereof. FIG. 14C is a diagram schematically showing the retroreflective film according to the thirteenth embodiment. 15 (a) and 15 (b) are diagrams schematically showing the steps of the retroreflective film according to the 14th embodiment and the manufacturing method thereof. 16 (a) and 16 (b) are diagrams schematically showing the steps of the retroreflective film according to the fifteenth embodiment and the method for producing the same. 17 (a), (b) and (c) are diagrams schematically showing the steps of the method for producing a retroreflective film according to the 16th embodiment. 18 (a) and 18 (b) are diagrams schematically showing the steps of the retroreflective film according to the 16th embodiment and the manufacturing method thereof. FIG. 18C is a diagram schematically showing a retroreflective film according to the 17th embodiment.

Hereinafter, various embodiments of the retroreflective film according to the present disclosure and the method for producing the retroreflective film will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicate description will be omitted as appropriate. In addition, the drawings may be partially simplified or exaggerated, and the dimensional ratios and the like are not limited to those described in the drawings.

"Retroreflective" means that when light is incident, it reflects light in the opposite direction of the incident direction. That is, "retroreflective" indicates that at least a part of the light emitted by the light source is retroreflected to return the light in the direction of returning to the light source. The "retroreflective layer" refers to a layered portion where retroreflective is performed. The "colored layer" refers to a layer having a color. A "colored layer" includes, for example, a layer having a color as opaque, translucent or colored transparent. The color may be either chromatic or achromatic. The chromatic color and the achromatic color conform to the definition in JIS Z8102: 2001.

"Brightness" is an index showing the brightness of a color, and the higher the lightness is, the closer the color is to white, and the lower the lightness is, the closer the color is to black. "Black" includes not only black but also a color that can be visually recognized as black, and includes dark blue, purple, brown, gray, and low-brightness green with a color scheme close to black. "Black" may be a color having hue or saturation, and may include a color having a brightness below a certain level.

A "bead" refers to a sphere provided inside a retroreflective layer, including, for example, transparent microsphere beads. The "bead layer" refers to a layer containing beads, for example, including a layer to which at least a part of the beads comes into contact. The “adhesive body” indicates an object to which the retroreflective film is attached, and an example thereof is a “moving body”. A "moving body" is a moving object and includes, for example, transportation equipment such as vehicles, ships, aircraft and rockets, and moving machines such as blades of generators. "Vehicles" include runnable machines such as automobiles, bicycles, trains and bullet trains. In the present disclosure, an example in which a retroreflective film is attached to a vehicle will be described.

In the present disclosure, the light emitted when observing the retroreflective film may be referred to as "normal light" or "straight line light". Ordinary light includes light of various wavelengths and includes light emitted in various directions. As a specific example, ordinary light indicates light in an environment where sunlight or light from general lighting is irradiated. On the other hand, the linear light shows highly directional light in which the traveling directions of the light are aligned more than a certain level, although the light includes light of various wavelengths. As a specific example, the linear light indicates the light emitted by the vehicle lamp. In addition, coherent light such as a laser beam is also included in the linear light. Further, later, an environment irradiated with normal light may be referred to as "under normal light", and an environment irradiated with linear light may be referred to as "under linear light".

FIG. 1 shows an automobile body 1 which is an example of a vehicle to which a retroreflective film is attached. The vehicle body 1 has a side window 2, an A pillar 3, a B pillar 4, and a C pillar 5. For example, the side window 2 is made of glass, and the A pillar 3, the B pillar 4, and the C pillar 5 are made of metal.

In the present embodiment, the retroreflective film 10 may be attached to at least one of the A pillar 3, the B pillar 4, and the C pillar 5, for example. The portion to which the retroreflective film 10 is attached looks black during normal daytime when the light is strong, and looks brighter than black when irradiated with straight light having strong directivity at night.

"Daytime" usually refers to an environment under light. “Daytime” indicates, for example, an environment under daytime sunlight or an environment under general illumination light. The “night” may mean, for example, the period from sunset to the sunrise of the next morning, or may indicate a state dark enough to require irradiation means.

The “color having a higher brightness than black” is, for example, any of yellow, green, and blue, and may further include colors other than yellow, green, and blue, such as red. Regarding the relationship between the sticking position of the retroreflective film 10 on the vehicle body 1 and the color, it is preferable to comply with the safety standards of road transport vehicles in each country. In view of the safety standards of Japanese road transport vehicles, for example, a retroreflective film 10 other than white may be attached to a portion of the vehicle body 1 facing the rear of the vehicle body 1. Further, a retroreflective film 10 other than red may be attached to a portion of the vehicle body 1 that faces the front of the vehicle body 1. It is possible to attach the retroreflective film 10 of any color to the A pillar 3, the B pillar 4, and the C pillar 5 that form the side surface portion of the vehicle body 1.

The retroreflective film 10 according to the embodiment can be observed as a colored color close to black under normal light. The retroreflective film 10 according to the embodiment is retroactive even when a wave in a wavelength band other than visible light emitted from a sensor including a millimeter wave radar or lidar (LIDAR: Light Detection and Ranging) used in a vehicle or the like is incident. Sexual reflex. Therefore, it is suitable for ensuring safety.

FIG. 2 is a perspective view showing an exemplary door 6 of the vehicle body 1. As shown in FIG. 2, the retroreflective film 10 may be attached to the door 6. For example, the retroreflective film 10 is attached to the inside of the door 6. In this case, since the retroreflective film 10 faces the rear of the vehicle body 1 when the door 6 is opened, the retroreflective film 10 shines so that the vehicle behind can recognize the existence of the vehicle body 1.

For example, the retroreflective film 10 is attached to the outer edge 6d of the inner surface 6c of the outer panel 6b of the door 6. In this way, when the retroreflective film 10 is attached to the outer edge 6d of the inner surface 6c of the outer panel 6b, for example, the retroreflective film 10 shines when light is emitted from the vehicle light of the following vehicle at night. This makes it possible for the following vehicle to recognize that the door 6 is open. As an example, a plurality of retroreflective films 10 may be attached to the outer edge 6d of the inner surface 6c of the outer panel 6b so as to be arranged vertically. The retroreflective film according to various other embodiments will be described below.

(First Embodiment)
FIG. 3 is a diagram schematically showing the layer structure of the retroreflective film 10 according to the first embodiment. As shown in FIG. 3, the retroreflective film 10 includes a release liner 11, an adhesive layer 12, a retroreflective layer 13, and a clear layer 14 in this order from the lower side (the adherend side of the retroreflective film 10). The first colored layer 15 and the second colored layer 16 are laminated.

The release liner 11 is, for example, a release film that is released from the pressure-sensitive adhesive layer 12. The release liner 11 includes, for example, a polymer or paper. The release liner 11 is preferably a polymer release liner from the viewpoint of surface smoothness. The material of the release coat of the release liner 11 is, for example, fluoropolymer, acrylic resin or silicone, but is not limited thereto.

The pressure-sensitive adhesive layer 12 is an adhesive layer that adheres to an adherend. The pressure-sensitive adhesive layer 12 contains, for example, an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive or an acrylic foam agent, and may further contain adhesive fine particles. However, the material of the pressure-sensitive adhesive layer 12 is not particularly limited. The retroreflective film 10 is attached by peeling off the release liner 11 and attaching the adhesive layer 12 to the vehicle body 1 and the like.

The retroreflective layer 13 includes a reflective layer 17 laminated on the pressure-sensitive adhesive layer 12, a space coat layer 18, a bead layer 19, and a bond layer 20. The reflective layer 17 is, for example, an aluminum-deposited layer having vapor-deposited aluminum. Further, the reflective layer 17 may be a silver-deposited layer having silver-deposited silver. Further, the reflective layer 17 may be flat or concave to cover each bead in the bead layer. The space coat layer 18 is, for example, a spacer layer that defines the distance between the reflective layer 17 and the bead layer 19. The reflective layer 17 defines a preferable interval for retroreflective light to each bead 19b of the bead layer 19 by the space coat layer 18.

The bead layer 19 is a layer containing a plurality of beads 19b which are microspheres. For example, the beads 19b are glass beads made of glass. The plurality of beads 19b are arranged in a grid pattern or a staggered pattern in the space coat layer 18, for example. When light X1 having strong directivity is incident on the beads 19b of the bead layer 19, the light X1 is reflected by the reflection layer 17, the reflected light X2 is incident on the beads 19b, and the reflected light X2 is reflected in the direction in which the light X1 is incident. Is emitted. As a result, the light X1 incident on the beads 19b is emitted from the beads 19b as reflected light X2 in the direction opposite to the incident direction, so that the retroreflective layer 13 performs retroreflective with strong directivity.

The bond layer 20 is, for example, a layer that covers a plurality of beads 19b of the bead layer 19, and is also referred to as a bead bond layer. The material of the bond layer 20 includes, for example, urethane resin, acrylic resin, vinyl chloride resin, silicone resin, epoxy resin, fluororesin, melamine resin, alkyd resin, or a mixture thereof. The bond layer 20 is, for example, an uncolored, colorless and transparent layer.

The clear layer 14 may be, for example, a resin film or a resin sheet made of a transparent resin. The material of the clear layer 14 is not particularly limited, but is, for example, PVC (polyvinyl alcohol). The thickness of the clear layer 14 is, for example, 3 μm or more and 500 μm, but as an example, it may be 58 μm and can be appropriately changed.

The first colored layer 15 is, for example, a layer colored in yellow. In the present disclosure, "yellow" includes not only pure yellow but also colors including yellow such as yellowish green and orange, and means yellow in a broad sense. The first colored layer 15 may contain, for example, a yellow pigment such as an isoindoline pigment, a dispersant such as a wet dispersant, and a solvent. The material of the first colored layer 15 may contain an acrylic copolymer and ethylene glycol monobutyl ether. The thickness of the first colored layer 15 is, for example, 1 μm or more and 10 μm or less, and as an example, 5 μm.

The second colored layer 16 is a layer colored with a color having a lightness lower than that of the first colored layer 15. For example, the color of the second colored layer 16 is black. The second colored layer 16 may contain a black pigment, a dispersant such as a wetting dispersant, and a solvent. The material of the second colored layer 16 may contain at least one of polycaprolactone diol, isophorone diisocyanate, black acrylic resin, acrylic polymer and methyl ethyl ketone.

As an example, the mass ratio of polycaprolactone diol in the second colored layer 16 is 47% or more and 48% or less, and the mass ratio of isophorone diisocyanate in the second colored layer 16 is 42% or more and 43% or less. The mass ratio of the black acrylic resin in the second colored layer 16 is 1% or more and 5% or less, and the mass ratio of the acrylic polymer in the second colored layer 16 is 0% or more and 1% or less. The thickness of the second colored layer 16 is, for example, 10 μm or more and 50 μm or less, but may be 25 μm or more and 35 μm or less.

Next, an example of a method for producing the retroreflective film 10 will be described with reference to FIGS. 4 (a) and 4 (b). First, as shown in FIG. 4A, a reflective sheet R1 on which a release liner 11, an adhesive layer 12, a retroreflective layer 13 and a clear layer 14 are laminated in advance is prepared (a retroreflective layer is prepared). Process). Then, the yellow liquid L1 is coated on the clear layer 14 of the reflective sheet R1 and the coated yellow liquid L1 is dried to form the first colored layer 15 (step of forming the first colored layer).

Then, as shown in FIG. 4B, the black liquid L2 is coated on the first colored layer 15 and the coated black liquid L2 is dried to form the second colored layer 16 (second coloring). Step of forming a layer). The above drying is performed by, for example, exposing at a temperature of 80 ° C. for 60 minutes. By forming the second colored layer 16 on the first colored layer 15 in this way, the retroreflective film 10 is completed.

Next, the action and effect of the retroreflective film 10 according to the present embodiment will be described. As shown in FIG. 3, in the retroreflective film 10, the second colored layer 16, the first colored layer 15, and the retroreflective layer 13 are laminated from the surface layer side in this order, and are located on the surface layer side. The color lightness of the two colored layers 16 is lower than the color lightness of the first colored layer 15 located on the retroreflective layer 13 side. As an example, the color of the first colored layer 15 is yellow, and the color of the second colored layer 16 is black. Therefore, when the normal light having a weak directivity is irradiated in the daytime, the color of the second colored layer 16 located on the surface layer side can be seen, so that the color having low lightness can be shown and the design can be improved.

On the other hand, when the light X1 which is a linear light having a strong directivity is irradiated at night, the retroreflective film 10 retroreflects the chromatic light. Specifically, when the light X1 is irradiated, the retroreflective layer 13 irradiates the reflected light X2 in the direction opposite to the irradiation direction, and the reflected light X2 passes through the first colored layer 15 and the second colored layer 16. To do. Therefore, due to the strong directivity of the reflected light X2 due to the irradiation of the light X1 at night, the high-brightness color of the first colored layer 15 can be seen at night. You can improve your sex.

As described above, the retroreflective layer 13 may have a bead layer 19 including a plurality of beads 19b. In this case, since the retroreflective layer 13 includes the bead layer 19, it is possible to suppress the reflection of the lattice shape as compared with those other than the bead layer 19. Therefore, the visibility of the retroreflective film 10 can be improved especially at night.

As described above, the color of the second colored layer 16 may be black. In this case, when the retroreflective film 10 is viewed during the daytime, the retroreflective film 10 looks black, so that the design can be improved.

The retroreflective coefficient of the reflected light X2 reflected by the retroreflective film 10 may be 0.3 (cd / lux / m ² ) or more, or 0.7 (cd / lux / m ² ) or more. It may be present, or it may be 1.0 (cd / lux / m ² ) or more. In this case, since the retroreflective coefficient of the reflected light X2 from the retroreflective layer 13 at night is 0.3 (cd / lux / m ² ) or more, the amount of reflected light X2 is strengthened and the brightness is high. The color can be emphasized, and the design and safety can be further enhanced. The retroreflective coefficient of the reflected light X2 reflected by the retroreflective film 10 may be 30 (cd / lux / m ² ) or less.

The retroreflective coefficient (cd / lux / m ² ) is obtained by using the measuring method specified in JIS Z 9117 8.3 “Retroreflective material, measurement of reflection performance”. Specifically, the retroreflection coefficient is a retroreflection coefficient (retroreflection coefficient R0.2) at an observation angle of 0.2 degrees and an incident angle of 5 degrees. , Denmark). In this case, the retroreflective coefficient can be obtained by irradiating the retroreflective film with light having a constant illuminance from the floodlight and measuring the brightness of the light reflected and returned from the retroreflective film.

The retroreflective film 10 may be attached to a moving body. In this case, the design of a moving body such as a vehicle can be improved by showing a color having a low brightness of the second colored layer 16 during the daytime. Further, by showing the color having high brightness of the first colored layer 15 at night, the design and safety of the moving body can be enhanced.

At night, for example, there are lights on the front and rear parts of the moving body, but there is often no shining light on the side parts of the moving body. Therefore, when the retroreflective film 10 is attached to the side surface portion of the moving body, the side surface portion can be illuminated with a high-brightness color at night, so that safety and design can be improved. It is also conceivable to provide a light on the side surface of the moving body, but in this case, it is necessary to supply electric power to the light. However, if the retroreflective film 10 is attached to the side surface portion of the moving body, it is possible to eliminate the need for power supply.

As described above, when the retroreflective film 10 is attached to at least one of the A pillar 3, the B pillar 4 and the C pillar 5 of the vehicle body 1, the blackness of the retroreflective film 10 can be emphasized during the daytime. it can. As a result, the inside of the side window 2 of the vehicle body 1 can be made to appear wider, and the design of the vehicle body 1 can be enhanced.

Further, when the retroreflective film 10 is attached to the side surface portion of the vehicle body 1, the side surface portion of the vehicle body 1 can be illuminated with a high-brightness color of the first colored layer 15 at night, so that the vehicle body 1 is safe. Contributes to the improvement of character and design. Further, when the retroreflective film 10 is attached to the inside of the door 6 of the vehicle body 1, the inside of the door 6 opened at night can be illuminated, so that the following vehicle or the like may approach the door 6. It can be avoided and contributes to further improvement of safety.

(Second Embodiment)
Next, the retroreflective film 10A according to the second embodiment will be described with reference to FIG. 5A. In addition, since various exemplary retroreflective films described later including the retroreflective film 10A have the same configuration as at least a part of the retroreflective film 10 described above, the retroreflective film 10 will be described later. The explanation that overlaps with the explanation of is omitted as appropriate.

As shown in FIG. 5A, the retroreflective film 10A according to the second embodiment includes a second colored layer 16A that is thicker than the above-mentioned second colored layer 16. The thickness of the second colored layer 16A is, for example, 50 μm or more and 100 μm or less, but may be 55 μm or more and 65 μm or less. The method for producing the retroreflective film 10A is the same as the method for producing the retroreflective film 10 described above, and the thickness of the black liquid L2 coated on the first colored layer 15 is different from that of the first embodiment. There is. As described above, the retroreflective film 10A according to the second embodiment has the same effect as that of the retroreflective film 10.

(Third Embodiment)
Subsequently, the retroreflective film 10B according to the third embodiment will be described with reference to FIG. 5 (b). The retroreflective film 10B includes a second colored layer 26 having a component different from that of the second colored layer 16 described above. The thickness of the second colored layer 26 is, for example, 10 μm or more and 50 μm or less, but may be 25 μm or more and 35 μm or less. The second colored layer 26 has the same components as the second colored layer 16, but the proportion of the components is different from that of the second colored layer 16.

As an example, the mass ratio of polycaprolactone diol in the second colored layer 26 is 45% or more and 46% or less, and the mass ratio of isophorone diisocyanate in the second colored layer 26 is 40% or more and 41% or less. The mass ratio of the black acrylic resin in the second colored layer 26 is 5% or more and 7% or less, and the mass ratio of the acrylic polymer in the second colored layer 26 is 0% or more and 1% or less, and the second The mass ratio of the methyl ethyl ketone in the colored layer 26 is 7% or more and 8% or less.

That is, the mass ratio of the black acrylic resin of the second colored layer 26 is 5% or more and 7% or less, which is higher than the mass ratio of the black acrylic resin of the second colored layer 16 (1% or more and 5% or less). large. Therefore, the retroreflective film 10B provided with the second colored layer 26 tends to be blackened even if the thickness of the second colored layer is thin, as compared with the retroreflective films 10 and 10A described above. The method for producing the retroreflective film 10B is the same as the method for producing the retroreflective films 10 and 10A except that the black liquid L3 forming the second colored layer 26 is applied. The same action and effect as those of the retroreflective films 10 and 10A can be obtained from the retroreflective film 10B.

(Fourth Embodiment)
Next, the retroreflective film 10C according to the fourth embodiment will be described with reference to FIG. 6A. The retroreflective film 10C includes a third colored layer 27 in place of the bond layer 20 described above. The third colored layer 27 functions as, for example, a bond layer (bead bond layer) covering a plurality of beads 19b of the bead layer 19.

The material of the third colored layer 27 includes, for example, urethane resin, acrylic resin, vinyl chloride resin, silicone resin, epoxy resin, fluororesin, melamine resin, alkyd resin, or a mixture thereof. The color lightness of the third colored layer 27 may be lower than the color lightness of the first colored layer 15 or higher than the color lightness of the first colored layer 15. As an example, the color of the third colored layer 27 is black.

Regarding the method for producing the retroreflective film 10C, first, a reflective sheet R2 in which a release liner 11, an adhesive layer 12, a retroreflective layer 13 having a third colored layer 27, and a clear layer 14 are laminated is prepared. Then, the yellow liquid L1 is coated on the clear layer 14 of the reflective sheet R2, and the coated yellow liquid L1 is dried to form the first colored layer 15. Then, the black liquid L2 is coated on the first colored layer 15 and the coated black liquid L2 is dried to form the second colored layer 16, and then the retroreflective film 10C is completed.

As described above, the retroreflective film 10C according to the fourth embodiment includes the third colored layer 27 located on the opposite side of the second colored layer 16 when viewed from the first colored layer 15, and has the colors of the third colored layer 27. The lightness may be lower than the lightness of the color of the first coloring layer 15. In this case, the third colored layer 27 is provided on the opposite side of the first colored layer 15 from the second colored layer 16, and the color lightness of the third colored layer 27 is lower than the color lightness of the first colored layer 15. ..

Therefore, the first colored layer 15 is sandwiched between the second colored layer 16 and the third colored layer 27, which have a color whose brightness is lower than the color brightness of the first colored layer 15. Therefore, by sandwiching the first colored layer 15 between the second colored layer 16 and the third colored layer 27 having low lightness, it is possible to show a color with lower lightness during the daytime, so that the design can be further enhanced. Can be done.

The third colored layer 27 may be a bond layer that covers the bead layer 19 including a plurality of beads 19b. In this case, the third colored layer 27, which is located on the opposite side of the first colored layer 15 from the second colored layer 16 and has a low-brightness color, is the bond layer 20 that covers the bead layer 19, so that during the daytime. Color unevenness can be suppressed while emphasizing the darkness of the retroreflective film 10C.

(Fifth Embodiment)
Next, the retroreflective film 10D according to the fifth embodiment will be described with reference to FIG. 6 (b). In the retroreflective film 10D, the thickness of the second colored layer 16 is thicker than that of the second colored layer 16 of the retroreflective film 10C. The thickness of the second colored layer 16 of the retroreflective film 10D is, for example, 50 μm or more and 100 μm or less, but may be 55 μm or more and 65 μm or less. From the retroreflective film 10D according to the fifth embodiment, the same effect as that of the retroreflective film 10C can be obtained.

(Sixth Embodiment)
The retroreflective film 10E according to the sixth embodiment will be described with reference to FIGS. 7 (a) and 7 (b). The retroreflective film 10E includes a first colored layer 25 having a structure different from that of the first colored layer 15. The first colored layer 25 is a layer formed on the clear layer 14 by printing. As an example, the first colored layer 25 may be a layer printed by an inkjet printer. In this case, the first colored layer 25 is formed by applying dot-shaped ink.

Regarding the method for producing the retroreflective film 10E, a reflective sheet R2 in which a release liner 11, an adhesive layer 12, a retroreflective layer 13 and a clear layer 14 are laminated is prepared. Then, the reflective sheet R2 is printed by an inkjet printer to form a first colored layer 25 made of dot-shaped ink on the clear layer 14. Then, the black liquid L2 is coated on the first colored layer 25 and the black liquid L2 is dried to form the second colored layer 16, and the production of the retroreflective film 10E is completed.

As described above, in the retroreflective film 10E, the first colored layer 25 is formed by an inkjet printer. That is, the first colored layer 25 is formed of dot-shaped ink. In this case, the degree of concealment by the first colored layer 25 can be increased, and the color unevenness of the first colored layer 25 can be reduced, so that the design of the retroreflective film 10E at night can be further enhanced. Can be done.

(7th Embodiment)
Next, the retroreflective film 10F according to the seventh embodiment will be described with reference to FIGS. 8 (a) and 8 (b). The retroreflective film 10F is different from the retroreflective film 10E in that the pressure-sensitive adhesive layer 32 and the clear layer 34 are provided between the first colored layer 25 and the second colored layer 16.

The pressure-sensitive adhesive layer 32 may contain, for example, an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or an acrylic foaming agent, and may be made of the same material as the pressure-sensitive adhesive layer 12 described above. The thickness of the pressure-sensitive adhesive layer 32 is, for example, 10 μm or more and 50 μm or less. The clear layer 34 is made of, for example, PVC (polyvinyl alcohol), and may be made of the same material as the clear layer 14 described above. The thickness of the clear layer 34 can be, for example, 10 μm or more and 100 μm, but as an example, it may be 50 μm and can be appropriately changed.

Regarding the method for producing the retroreflective film 10F, first, the first colored layer 25 is printed on the reflective sheet R2, and then the clear layer 34 with the adhesive layer 32 is laminated on the first colored layer 25. Then, in the same manner as described above, the black liquid L2 is coated and dried to form the second colored layer 16 on the clear layer 34, and the retroreflective film 10F is completed. In the retroreflective film 10F, the thickness of the second colored layer 16 is, for example, 50 μm or more and 60 μm or less. From this retroreflective film 10F, the same effect as that of the retroreflective film 10E can be obtained.

(8th Embodiment)
Subsequently, the retroreflective film 10G according to the eighth embodiment will be described with reference to FIGS. 9 (a), 9 (b), 9 (c), 9 (d) and 10 (a). .. The retroreflective film 10G is different from the above-mentioned retroreflective film 10F in that a pressure-sensitive adhesive layer 35 and a transparent resin layer 36 are further provided between the clear layer 34 and the second colored layer 16.

The pressure-sensitive adhesive layer 35 may be made of the same material as the pressure-sensitive adhesive layers 12 and 32 described above, and the thickness of the pressure-sensitive adhesive layer 35 is 30 μm or more and 50 μm or less (40 μm as an example). The transparent resin layer 36 is made of, for example, polyethylene terephthalate (PET), but may be made of another resin material.

Regarding the method for producing the retroreflective film 10G, first, as shown in FIGS. 9 (a) and 9 (b), a first colored layer 25 is printed on the reflective sheet R2 to form a clear layer with an adhesive layer 32. 34 is laminated on the first colored layer 25. On the other hand, as shown in FIG. 9C, the black liquid L2 is coated on the transparent resin layer 36 and the black liquid L2 is dried to form the second colored layer 16 on the transparent resin layer 36. To do.

At this time, for example, the black liquid L2 having a thickness of 40 μm or more and 60 μm or less is dried to form a second colored layer 16 having a thickness of 30 μm or more and 35 μm or less (for example, 32 μm). Then, as shown in FIGS. 9 (d) and 10 (a), the pressure-sensitive adhesive layer 35 is laminated on the clear layer 34, and the transparent resin layer 36 on which the second colored layer 16 is formed is layered on the pressure-sensitive adhesive layer. Laminate on the clear layer 34 via 35. This completes the production of the retroreflective film 10G.

(9th Embodiment)
FIG. 10B is a diagram showing the retroreflective film 10H according to the ninth embodiment. In the retroreflective film 10H, the thickness of the second colored layer 16 is thicker than that of the second colored layer 16 of the retroreflective film 10G. The thickness of the second colored layer 16 of the retroreflective film 10H is, for example, 50 μm or more and 100 μm or less, but may be 50 μm or more and 60 μm or less. The method for producing the retroreflective film 10H is the same as the method for producing the retroreflective film 10G.

(10th Embodiment)
Next, the retroreflective film 10J according to the tenth embodiment will be described with reference to FIGS. 11 (a) and 11 (b). As shown in FIGS. 11 (a) and 11 (b), the retrospective reflective film 10J is provided with the first colored layer 45 having a green color instead of the first colored layer 25. It is different from the sex reflective film. In the present disclosure, "green" includes not only pure green but also colors including green such as blue-green and yellow-green, and means green in a broad sense.

The first colored layer 45 is formed on, for example, the clear layer 14 by printing. In this case, the first colored layer 45 is formed by applying dot-shaped ink. The first colored layer 45 may be, for example, a layer formed by an inkjet printer or a layer formed by a green liquid (green pigment).

Regarding the method for manufacturing the retroreflective film 10J, for example, the reflective sheet R2 is printed with an inkjet printer to form a first colored layer 45 made of dot-shaped ink on the clear layer 14. Then, the black liquid L2 is coated on the first colored layer 45 and the black liquid L2 is dried to complete the production of the retroreflective film 10J.

As described above, since the retroreflective film 10J includes the first colored layer 45 which is green, the attached retroreflective film 10J can be made to shine green at night. In general, yellow has the image of enhancing concentration or judgment and calling attention, while green has the image of healing and relaxing the body. Therefore, since the above-mentioned retroreflective films 10 to 10H are provided with the yellow first colored layer 15, the retroreflective films 10 to 10H have an effect of calling attention. On the other hand, the retroreflective film 10J provided with the green first colored layer 45 has the effects of enhancing the relaxing effect and calming the feelings.

(11th Embodiment)
12 (a) and 12 (b) are views showing the retroreflective film 10K according to the eleventh embodiment. The retroreflective film 10K is different from the retroreflective film 10J in that the pressure-sensitive adhesive layer 32 and the clear layer 34 are provided between the first colored layer 45 and the second colored layer 16. As a method for producing the retroreflective film 10K, first, the first colored layer 45 is printed on the reflective sheet R2, and then the clear layer 34 with the adhesive layer 32 is laminated on the first colored layer 45. Then, in the same manner as described above, the black liquid L2 is coated and dried to form the second colored layer 16 on the clear layer 34, and the retroreflective film 10K is completed. From the retroreflective film 10K, the same effect as that of the retroreflective film 10J can be obtained.

(12th Embodiment)
13 (a), 13 (b), 13 (c), 14 (a) and 14 (b) show the retroreflective film 10L and the retroreflective film 10L according to the thirteenth embodiment. It is a figure which shows the manufacturing method. The retroreflective film 10L is different from the retroreflective film 10K in that the adhesive layer 35 and the transparent resin layer 36 are provided between the clear layer 34 and the second colored layer 16.

Regarding the method for producing the retroreflective film 10L, as shown in FIGS. 13 (a) and 13 (b), the first colored layer 45 is printed on the reflective sheet R2 to form a clear layer 34 with the adhesive layer 32. It is laminated on the first colored layer 45. Further, as shown in FIG. 13C, the black liquid L2 is coated on the transparent resin layer 36 and the black liquid L2 is dried to form the second colored layer 16 on the transparent resin layer 36. To do.

Then, as shown in FIGS. 14 (a) and 14 (b), the pressure-sensitive adhesive layer 35 is laminated on the clear layer 34, and the transparent resin layer 36 on which the second colored layer 16 is formed is layered on the pressure-sensitive adhesive layer. Laminate on the clear layer 34 via 35. This completes the production of the retroreflective film 10L.

(13th Embodiment)
FIG. 14C is a diagram showing the retroreflective film 10M according to the thirteenth embodiment. In the retroreflective film 10M, the thickness of the second colored layer 16 is thicker than that of the second colored layer 16 of the retroreflective film 10L. The thickness of the second colored layer 16 of the retroreflective film 10M is, for example, 50 μm or more and 100 μm or less, but may be 50 μm or more and 60 μm or less.

(14th Embodiment)
The retroreflective film 10N according to the 14th embodiment will be described with reference to FIGS. 15 (a) and 15 (b). As shown in FIGS. 15A and 15B, the retroreflective film 10N includes the first colored layer 55 having a blue color instead of the first colored layers 25 and 45, as described above. Different from each retroreflective film.

In the present disclosure, "blue" includes not only pure blue but also colors including blue such as light blue, blue-green, and dark blue, and means blue in a broad sense. The first colored layer 55 is formed on, for example, the clear layer 14 by printing. The first colored layer 55 may be a layer formed by an inkjet printer or a layer formed by a blue liquid (blue pigment).

Regarding the method for producing the retroreflective film 10N, for example, the reflective sheet R2 is printed with an inkjet printer to form a first colored layer 55 made of dot-shaped ink on the clear layer 14. Then, the black liquid L2 is coated on the first colored layer 55 and the black liquid L2 is dried to complete the production of the retroreflective film 10N.

As described above, since the retroreflective film 10N includes the first colored layer 55 which is blue, the attached retroreflective film 10N can be made to shine blue at night. In general, blue has the image of increasing concentration and calming. Therefore, the retroreflective film 10N provided with the blue first colored layer 55 can enhance the concentration and the relaxing effect.

(15th Embodiment)
16 (a) and 16 (b) are views showing the retroreflective film 10P according to the fifteenth embodiment. The retroreflective film 10P is different from the retroreflective film 10N in that the pressure-sensitive adhesive layer 32 and the clear layer 34 are provided between the first colored layer 55 and the second colored layer 16. As a method for producing the retroreflective film 10P, after the first colored layer 55 is printed on the reflective sheet R2, the clear layer 34 with the adhesive layer 32 is laminated on the first colored layer 55. Then, the black liquid L2 is coated and dried to form the second colored layer 16 on the clear layer 34, and a series of manufacturing steps is completed. From the retroreflective film 10P, the same effect as that of the retroreflective film 10N can be obtained.

(16th Embodiment)
17 (a), 17 (b), 17 (c), 18 (a) and 18 (b) show the retroreflective film 10Q and the retroreflective film 10Q according to the 16th embodiment. It is a figure which shows the manufacturing method. The retroreflective film 10Q is different from the retroreflective film 10P in that the adhesive layer 32, the clear layer 34, the adhesive layer 35 and the transparent resin layer 36 are provided between the first colored layer 55 and the second colored layer 16. It's different.

As shown in FIGS. 17 (a) and 17 (b), for example, the first colored layer 55 is printed on the reflective sheet R2, and the clear layer 34 with the adhesive layer 32 is laminated on the first colored layer 55. .. Further, as shown in FIG. 17C, the black liquid L2 is coated on the transparent resin layer 36 and the black liquid L2 is dried to form the second colored layer 16 on the transparent resin layer 36. To do.

Then, as shown in FIGS. 18A and 18B, the pressure-sensitive adhesive layer 35 is laminated on the clear layer 34, and the transparent resin layer 36 on which the second colored layer 16 is formed is formed as the pressure-sensitive adhesive layer. Laminate on the clear layer 34 via 35. After going through the above steps, the production of the retroreflective film 10Q is completed.

(17th Embodiment)
FIG. 18C is a diagram showing the retroreflective film 10R according to the 17th embodiment. In the retroreflective film 10R, the thickness of the second colored layer 16 is thicker than that of the second colored layer 16 of the retroreflective film 10Q. The thickness of the second colored layer 16 of the retroreflective film 10R is, for example, 50 μm or more and 100 μm or less, but may be 50 μm or more and 60 μm or less.

(Example)
Next, an example of the retroreflective film according to the present embodiment will be described. The present disclosure is not limited to the following examples. In the experiment according to the example, the retroreflective film of the example was attached to the vehicle body 1 and the colors of the retroreflective films during the daytime and at night were measured.

(Example 1)
As the retroreflective film of Example 1, the retroreflective film 10 shown in FIG. 3 was used. Specifically, it is a retroreflective film 10 including a release liner 11, an adhesive layer 12, a retroreflective layer 13, a clear layer 14, a yellow first colored layer 15, and a black second colored layer 16. The thickness of the clear layer 14 was 58 μm, the thickness of the first colored layer 15 was 5 μm, and the thickness of the second colored layer 16 was 30 μm.

In Example 1, Scotchcal (registered trademark) reflective sheet white was used as the release liner 11, the adhesive layer 12, the retroreflective layer 13 and the clear layer 14. As the material of the first coloring layer 15, 3.00% by mass of an organic yellow pigment (Irgaphor (registered trademark) Yellow 2R-CF, manufactured by BASF Japan Ltd.), 0.66% by mass of a wet dispersant (DISPERBYK-2000, BYK), 0.09% by weight dispersant (solsperse® 22000, Lubrizol), 16.25% by weight paint (Joncryl 67, BASF Japan), solvent (PMA), and 12 .00% by mass of butyl cellosolve (manufactured by Wako Pure Chemical Industries, Ltd.) was used. The material of the second colored layer 16 is 47.4% by mass of a transparent polycaprolactone diol solution (FPR1J clear manufactured by 3M), 42.8% by mass of isophorone diisocyanate (VENESTANATT1890E, manufactured by Evonik Japan), 1.6. Mass% of black acrylic resin (TX-6013A T502, manufactured by BASF Japan), 0.5% by mass of acrylic polymer (BYK355, manufactured by BYK Japan) and 7.7% by mass of methyl ethyl ketone were used.

(Example 2)
As the retroreflective film of Example 2, the retroreflective film 10A shown in FIG. 5A was used. Specifically, it is a retroreflective film 10A provided with a release liner 11, an adhesive layer 12, a retroreflective layer 13, a clear layer 14, a yellow first colored layer 15, and a black second colored layer 16. The thickness of the clear layer 14 was 58 μm, the thickness of the first colored layer 15 was 5 μm, and the thickness of the second colored layer 16 was 60 μm. The material of the first colored layer 15 and the material of the second colored layer 16 are the same as in Example 1.

(Example 3)
As the retroreflective film of Example 3, the retroreflective film 10B shown in FIG. 5B was used. In the retroreflective film of Example 3, the material of the second colored layer 26 is different from that of the second colored layer 16 of Example 1. The material of the second colored layer 26 is 45.3% by mass of a transparent polycaprolactone diol solution (FPR1J clear manufactured by 3M), 40.9% by mass of isophorone diisocyanate (VENESTANATT1890E, manufactured by Evonik Japan), 6.0. Mass% black acrylic resin (TX-6013A T502, manufactured by BASF Japan), 0.4 mass% acrylic polymer (BYK355, manufactured by BYK Japan) and 7.4 mass% methyl ethyl ketone were used. The thickness of the second colored layer 26 was set to 30 μm.

(Example 4)
As the retroreflective film of Example 4, the retroreflective film 10C shown in FIG. 6A was used. The thickness of the clear layer 14 was 58 μm, the thickness of the first colored layer 15 was 5 μm, and the thickness of the second colored layer 16 was 30 μm. The color of the third colored layer 27 was black.

(Example 5)
As the retroreflective film of Example 5, the retroreflective film 10D shown in FIG. 6B was used. In the retroreflective film of Example 5, the thickness of the second colored layer 16 was set to 60 μm.

(Example 6)
As the retroreflective film of Example 6, the retroreflective film 10E shown in FIG. 7B was used. The retroreflective film of Example 6 is different from the retroreflective film of Example 1 in that the first colored layer 25 formed by printing is used instead of the first colored layer 15. In Example 6, the first colored layer 25 was printed by an inkjet printer (iPD8400SE, manufactured by Canon Inc.).

(Example 7)
As the retroreflective film of Example 7, the retroreflective film 10F shown in FIG. 8B was used. In Example 7, the thickness of the second colored layer 16 was 54 μm, the thickness of the pressure-sensitive adhesive layer 32 was 30 μm, and the thickness of the clear layer 34 was 54 μm.

(Example 8)
The retroreflective film of Example 8 was the retroreflective film 10G shown in FIG. 10 (a). In Example 8, the thickness of the clear layer 14 is 58 μm, the thickness of the pressure-sensitive adhesive layer 32 is 40 μm, the thickness of the clear layer 34 is 50 μm, the thickness of the pressure-sensitive adhesive layer 35 is 40 μm, and the thickness of the transparent resin layer 36. Was 50 μm, and the thickness of the second colored layer 16 was 33 μm.

(Example 9)
In the retroreflective film of Example 9, the thickness of the second colored layer 16 of the retroreflective film of Example 8 was set to 54 μm.

(Example 10)
The retroreflective film of Example 10 was a retroreflective film 10J provided with a printed green first colored layer 45, as shown in FIG. 11B. The thickness of the clear layer 14 was 58 μm, and the thickness of the second colored layer 16 was 54 μm.

(Example 11)
The retroreflective film of Example 11 was the retroreflective film 10K shown in FIG. 12 (b). The thickness of the clear layer 14 was 58 μm, the thickness of the pressure-sensitive adhesive layer 32 was 30 μm, the thickness of the clear layer 34 was 50 μm, and the thickness of the second colored layer 16 was 54 μm.

(Example 12)
The retroreflective film of Example 12 was the retroreflective film 10M shown in FIG. 14 (b). In Example 12, the thickness of the clear layer 14 is 58 μm, the thickness of the pressure-sensitive adhesive layer 32 is 35 μm, the thickness of the clear layer 34 is 50 μm, the thickness of the pressure-sensitive adhesive layer 35 is 40 μm, and the thickness of the transparent resin layer 36. Was 50 μm, and the thickness of the second colored layer 16 was 33 μm.

(Example 13)
In the retroreflective film of Example 13, the thickness of the second colored layer 16 of the retroreflective film of Example 12 was set to 54 μm.

(Example 14)
As shown in FIG. 15B, the retroreflective film of Example 14 was a retroreflective film 10N provided with a printed blue first colored layer 55. The thickness of the clear layer 14 was 58 μm, and the thickness of the second colored layer 16 was 54 μm.

(Example 15)
The retroreflective film of Example 15 was the retroreflective film 10P shown in FIG. 16 (b). The thickness of the clear layer 14 was 58 μm, the thickness of the pressure-sensitive adhesive layer 32 was 30 μm, the thickness of the clear layer 34 was 50 μm, and the thickness of the second colored layer 16 was 54 μm.

(Example 16)
The retroreflective film of Example 16 was the retroreflective film 10Q shown in FIG. 18 (b). In Example 16, the thickness of the clear layer 14 is 58 μm, the thickness of the pressure-sensitive adhesive layer 32 is 35 μm, the thickness of the clear layer 34 is 50 μm, the thickness of the pressure-sensitive adhesive layer 35 is 40 μm, and the thickness of the transparent resin layer 36. Was 50 μm, and the thickness of the second colored layer 16 was 33 μm.

(Example 17)
In the retroreflective film of Example 17, the thickness of the second colored layer 16 of the retroreflective film of Example 16 was set to 54 μm.

(Comparative Example 1)
As the retroreflective film of Comparative Example 1, Scotchcal (registered trademark) reflective sheet white was used. The retroreflective film of Comparative Example 1 is a reflective film of the retroreflective film of Example 1 excluding the clear layer 14, the first colored layer 15, and the second colored layer 16.

(Comparative Example 2)
As the retroreflective film of Comparative Example 2, Scotchcal (registered trademark) reflective sheet black was used. The retroreflective film of Comparative Example 2 is a reflective film of the retroreflective film 10C shown in FIG. 6A, excluding the clear layer 14, the first colored layer 15, and the second colored layer 16.

An experiment was conducted in which the colors of the retroreflective films of Examples 1 to 17 and Comparative Examples 1 and 2 were measured under normal light and under straight light at night, respectively. .. The results are shown in Table 1 below. In the visible light evaluation column of Table 1, "○" indicates a color in which the retroreflective film looks black under normal light and the retroreflective film has a higher brightness than black under straight light (yellow, green). Or blue), and "Δ" indicates a result other than "○". In addition, "colors observed under normal light" in Table 1 indicate the colors of the retroreflective film observed under general lighting, and "colors observed under straight light" irradiate straight light at night. Shows the color of the retroreflective film observed when

In the measurement of the retroreflective coefficient (cd / lux / m ² ), the measuring method specified in JIS Z 9117 8.3 “Measurement of retroreflective material and reflection performance” was used. Specifically, the retroreflection coefficient is a retroreflection coefficient (retroreflection coefficient R0.2) at an observation angle of 0.2 degrees and an incident angle of 5 degrees. , Denmark). That is, the retroreflective coefficient was obtained by irradiating the retroreflective film with light of a constant illuminance from a floodlight and measuring the brightness of the light reflected and returned from the retroreflective film. The retroreflective coefficient in Table 1 is that the observation angle, which is the angle difference between the floodlight and the receiver, is 0.2 °, and the incident angle, which is the difference between the perpendicular to the retroreflective film and the angle of the floodlight, is 5 °. The average value of the results of three-point measurement under the above conditions is shown.

As shown in Table 1, Examples 1 and 2 include a yellow first colored layer 15 obtained by coating the yellow liquid L1 and a second colored layer 16 containing 1.6% by mass of a black acrylic resin. , 4, 5 Retroreflective film, and the retroreflective film of Example 3 comprising a first colored layer 15 and a second colored layer 26 having a thickness of 30 μm containing 6.0% by mass of black acrylic resin. In, the brightness of the color at night was higher than that of the color during the day, and particularly good results were obtained.

Further, the retroreflective films of Examples 6 and 7 including the first colored layer 25 obtained by an inkjet printer and the second colored layer 16 containing 1.6% by mass of black acrylic resin are also as good as described above. The result was obtained. The retroreflective film of Examples 8 and 9 provided with the pressure-sensitive adhesive layer 32 and the clear layer 34 together with the second colored layer 16 having a thickness of 33 μm or 54 μm can also make the retroreflective film glow yellow at night. Good results were obtained.

In the example provided with the green first colored layer 45, the clear layer 14 has a thickness of 58 μm, the second colored layer 16 has a thickness of 54 μm, Example 10, and the adhesive layer 32 and the clear layer 34 are further provided. In Example 11, the retroreflective film could be made to shine green when it was irradiated with straight light, and particularly good results were obtained. Further, the same good effects as described above can be obtained in Examples 12 and 13 including the pressure-sensitive adhesive layer 35 having a thickness of 40 μm, the transparent resin layer 36 having a thickness of 50 μm, and the second colored layer 16 having a thickness of 33 μm or 54 μm. Obtained.

In the example including the blue first colored layer 55, the clear layer 14 has a thickness of 58 μm, the second colored layer 16 has a thickness of 54 μm, and the adhesive layer 32 and the clear layer 34 are further provided. In Example 15, the retroreflective film could be made to shine blue when irradiated with straight light, and particularly good results were obtained. Further, the same good effects as described above can be obtained in Examples 16 and 17 including the pressure-sensitive adhesive layer 35 having a thickness of 40 μm, the transparent resin layer 36 having a thickness of 50 μm, and the second colored layer 16 having a thickness of 33 μm or 54 μm. Obtained. As described above, in the retroreflective film including the first colored layer which is yellow, green or blue, and the second colored layer which is black which is lower in brightness than the first colored layer, the retroreflective film during the daytime It was found that the retroreflective film can be made to shine in a color other than black (chromatic color) when it is irradiated with straight light while exhibiting the blackness of the film, and good results can be obtained.

The various embodiments and examples of the retroreflective film according to the present disclosure have been described above. However, the present invention is not limited to the above-described embodiments or examples.

For example, in the above-described embodiment, the retroreflective film 10 including the bead layer 19 has been described. However, the retroreflective film does not have to include the bead layer, and may include, for example, a prism layer instead of the bead layer 19. In this case, since light can be retroreflectively reflected from the retroreflective layer provided with the prism, the same effect as described above can be obtained.

Further, in the above-described embodiment, the retroreflective film 10 provided with the black second colored layer 16 has been exemplified. However, the color of the second colored layer may be a color other than black, and can be appropriately changed as long as the color has a lower brightness than the first colored layer. The color of the first coloring layer is not limited to yellow, green or blue, and may be white, red, pink, brown, orange, yellowish green or purple and can be appropriately changed.

Further, in the above-described embodiment, an example in which the retroreflective film 10 is attached to the vehicle body 1 has been described. However, the retroreflective film may be attached to something other than the vehicle body. For example, a retroreflective film attached to a bicycle, a retroreflective film attached to a ship, a retroreflective film attached to a railroad vehicle, a retroreflective film attached to an aircraft, or a retroreflective film attached to a mobile machine. It may be a retroreflective film, or it may be a retroreflective film attached to something other than a moving body. In this way, the adherend to which the retroreflective film is attached can be appropriately changed.

1 ... Body (adhesive body), 10,10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10J, 10K, 10L, 10M, 10N, 10P, 10Q, 10R ... Retroreflective film, 13 ... Retroreflective layer, 15, 25, 45, 55 ... 1st colored layer, 16, 16A, 26 ... 2nd colored layer, 20 ... Bond layer, 27 ... 3rd colored layer.

Claims (11)

A retroreflective film with multiple layers
The plurality of layers
An adhesive layer that adheres to the adherend,
Retroreflective layer and
The first colored layer and
A second colored layer having a lower brightness than the first colored layer,
In this order,
The retroreflective layer retroreflects at least a part of the light transmitted through the second colored layer and the first colored layer toward the light source of the light.
Retroreflective film. A third colored layer is provided between the first colored layer and the retroreflective layer.
The brightness of the third colored layer is lower than the brightness of the first colored layer.
The retroreflective film according to claim 1. The retroreflective layer has a bead layer containing a plurality of beads, a reflective layer that reflects light, and a spacer layer located between the bead layer and the reflective layer.
The retroreflective film according to claim 1 or 2. The third colored layer is a bond layer that covers a bead layer containing a plurality of beads.
The retroreflective film according to claim 2. The second colored layer is black.
The retroreflective film according to any one of claims 1 to 4. In the retroreflective film, when white light is incident, the retroreflective light becomes chromatic.
The retroreflective film according to any one of claims 1 to 5. The retroreflective coefficient of the retroreflective film is 0.3 (cd / lux / m ² ) or more and 30 (cd / lux / m ² ) or less.
The retroreflective film according to any one of claims 1 to 6. The retroreflective coefficient of the retroreflective film is 1.0 (cd / lux / m ² ) or more.
The retroreflective film according to claim 7. The third colored layer is black.
The retroreflective film according to claim 2. The adherend is a moving body,
The retroreflective film according to any one of claims 1 to 9. The process of preparing the retroreflective layer and
The step of forming the first colored layer on the retroreflective layer and
A step of forming a second colored layer having a brightness lower than that of the first colored layer on the first colored layer, and
Includes
The retroreflective layer retroreflects at least a part of the light transmitted through the second colored layer and the first colored layer toward the light source of the light.
A method for manufacturing a retroreflective film.