JP2001354000A - Decorative sheet and decorative molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet and a decorative molding which have patterns having a cubic effect by the change in color tone caused by the reflective angle of light. SOLUTION: At least a discoloration layer 3 containing 0.5-20 wt.% of a light interference pigment and a dark color layer 4 of 40 or below L-value in the L*a*b* color expressing system of CIE (International Illumination Committee) 1976 (JIS Z8729) are formed, and the dark color layer 4 is positioned below the discoloration change layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can be used for decorative sheets for building materials, decorative sheets for automobiles, and the like. The color tone changes according to the viewing direction, that is, the angle of reflection of light rays, and the pattern has a three-dimensional appearance. It relates to decorative sheets and decorative molded products.

[0002]

2. Description of the Related Art Conventionally, as a decorative sheet used for decorative sheets for building materials or decorative sheets for automobiles, a plastic film is used as a base sheet, and a pattern is formed thereon by using a colored pigment ink such as iron oxide or carbon black. Some were multi-layer printed.

[0003]

However, a decorative sheet on which a pattern is printed using an ordinary colored pigment ink has the problem that it is possible to express a gradation, but it is difficult to express a three-dimensional effect.

For example, a wood grain product having a natural wood grain surface coated has a three-dimensional appearance in which the pipe part is raised or hidden depending on the viewing angle. However, a pipe pattern is printed using a normal colored pigment ink. A decorative sheet cannot express such a three-dimensional effect.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a decorative sheet and a decorative molded product having a three-dimensional design in which the color tone changes according to the reflection angle of light rays, eliminating the above-mentioned drawbacks. I do.

[0006]

According to the present invention, it has been found that, when a layer containing a light interference pigment is formed on a black-based layer, the color tone changes significantly depending on the direction of the light beam.

[0007] In order to achieve the above object, the decorative sheet of the present invention is configured as follows.

In other words, the decorative sheet of the present invention comprises a discoloring layer containing 0.5 to 20% by weight of a light interference pigment,
(International Commission on Illumination) At least a dark layer having an L value of 40 or less in the L ^* a ^* b ^* color system of 1976 (JIS Z8729) is formed, and the dark layer is located below the discoloring layer. did.

In the above invention, the content of the light interference pigment in the color-change layer is 0.5 to 4.0% by weight, and the L value of the dark color layer is determined by the content of the light interference pigment in the color-change layer. (weight%)
You may comprise so that it may be a value of * 8 or less.

In the above invention, the color change layer may be constituted by an ink film or a base sheet.

In the above invention, the dark layer may be constituted by an ink film or a base sheet.

Further, in the above invention, the CIE (International Commission on Illumination) 1976 (JIS Z8)
729) may be configured such that a bright color layer having an L value of 60 or more in the L ^* a ^* b ^* color system is formed.

In the above invention, the light color layer may be constituted by an ink film or a base sheet.

Further, in the above invention, a configuration may be adopted in which a blank pattern pattern layer is formed on the discoloration layer.

Further, the decorative molded article of the present invention is characterized in claim 1
The decorative sheets described in Nos. To 7 were laminated on the surface of the molded product.

Further, in the decorative molded article of the present invention, the decorative sheet in which at least one of the base sheet and the discoloration layer containing the light interference pigment in an amount of 0.5 to 20% by weight is formed,
IE (International Commission on Illumination) 1976 (JIS Z872
It was configured to be laminated on a molded product having an L value of 40 or less in the L ^* a ^* b ^* color system of 9).

In the above invention, the content of the light interference pigment in the color-change layer is 0.5 to 4.0% by weight, and the L value of the surface of the molded product is such that the content of the light interference pigment in the color-change layer is low. The ratio (weight%) may be configured to be a value of 8 or less.

Further, in the above invention, the CIE (International Commission on Illumination) 1976 (JIS Z8)
729) may be configured such that a bright color layer having an L value of 60 or more in the L ^* a ^* b ^* color system is formed.

Further, in the decorative molded article of the present invention, a discoloration layer containing 0.5 to 20% by weight of a light interference pigment is provided on one surface of a base sheet, and a CIE (International Commission on Illumination) 1976
At least a dark layer having an L value of 40 or less in L ^* a ^* b ^* color system of (JIS Z8729) is formed;
The decorative sheet in which the dark layer is located below the discoloration layer is CIE
(International Commission on Illumination) It was configured to be laminated on a molded product having an L ^* a ^* b ^* color system L value of 60 or more in 1976 (JIS Z8729).

Further, in the above invention, a configuration may be adopted in which a blank pattern pattern layer is formed on the discoloration layer.

[0021]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the decorative sheet of the present invention. FIG. 2 is a plan view showing one embodiment of the decorative sheet of the present invention. FIG. 3 is a sectional view showing one embodiment of the decorative sheet of the present invention. FIG. 4 is a plan view showing one embodiment of the decorative sheet of the present invention. FIG.
FIG. 1 is a sectional view showing one embodiment of a decorative sheet of the present invention. FIG. 6 is a plan view showing one embodiment of the decorative sheet of the present invention. FIG. 7 is a graph showing the relationship between the content of the magnesium fluoride mixture in the discoloration layer and the degree of color tone change. FIG. 8 is a graph showing the relationship between the L value of the dark color layer and the degree of color tone change. In the figure, 1 is a decorative sheet, 2 is a base sheet, 3 is a color changing layer, 4 is a dark color layer, 5 is a light color layer, 6 is a cut pattern pattern layer, 7 is a cut pattern pattern layer, 8 is a hard coat layer, 9 is a molded product.

The decorative sheet 1 of the present invention has a discoloration layer 3 containing 0.5 to 20% by weight of a light interference pigment and L ^{* of} CIE (International Commission on Illumination) 1976 (JIS Z8729) ^.
The dark color layer 4 in which the L value in the a ^* b ^* color system is 40 or less
Are formed at least, and the dark color layer 4 is located below the color change layer 3 (see FIG. 1).

That is, when the decorative sheet 1 is used, the color changing layer 3 and the dark color layer 4 are located in front of the user when the decorative sheet 1 is used, and the dark color layer 4 is positioned behind the color changing layer 3. It is constituted so that.

The color change layer 3 and the dark color layer 4 are usually formed on the base sheet 2. As a material of the base sheet 2, a sheet used as a base sheet of an ordinary decorative sheet, such as a resin sheet of a polypropylene resin, a polyethylene resin, a polyamide resin, a polyester resin, an acrylic resin, a polyvinyl chloride resin, or the like. Can be used.
If the base sheet 2 is transparent, the color changing layer 3 and the dark color layer 4 can be formed not only on the front side but also on the back side of the base sheet 2.

The color-changing layer 3 is a layer containing 0.5 to 20% by weight of a light interference pigment, and may be either an ink film or a substrate sheet 2.

The light interference pigment is a special pigment in which only a part of incident light is reflected by an interference effect of light and other spectral components are transmitted. Specifically, there are fine flakes (hereinafter, referred to as a magnesium fluoride mixture) in which thin layers made of magnesium fluoride, aluminum, and chromium are laminated, and a siloxane polymer having mesogen side chains. Among them, a magnesium fluoride mixture is preferable because various colors can be selected by changing the thickness of each layer.

In the present invention, it is important that the light interference pigment is contained in the color-changing layer 3 in an amount of 0.5 to 20% by weight. FIG. 7 is a graph showing the relationship between the content of the magnesium fluoride mixture in the color change layer 3 and the degree of color tone change. The change in color tone is shown with 100 when the content of the magnesium fluoride mixture is 4% by weight. That is, the oblique 45
° The difference between the color tone when viewed from above and the color tone when viewed from directly above was measured as the color difference ΔE in the L ^* a ^* b ^* color system, and the case where the content of the magnesium fluoride mixture was 4% by weight was measured. 100 is a relative comparison.

The L value of the dark color layer 4 was set to 20. Regarding the easiness of the change of the color tone, it was found that the content and the effect of the magnesium fluoride mixture were almost proportional to each other when the content was in the range of 0.1 to 4.0% by weight. At 4 to 20% by weight, even if the content is increased, an effect proportional to the content cannot be obtained. Further, when the content exceeded 20%, cohesive failure occurred in the discoloration layer 3. This tendency was similarly observed when the light interference pigment was other than magnesium fluoride.

The dark layer 4 is made up of CIE (International Commission on Illumination) 1
L of 976 (JIS Z8729) ^*a^*b^*To color system
Is a layer having an L value of 40 or less.

The ease with which the color tone of the color changing layer 3 changes depends on the color of the underlying layer, and the higher the color, the lower the L value, the higher the effect. FIG.
6 is a graph showing a relationship between a value and a degree of color tone change. The color tone change is shown as 100 when L = 20 and the content of magnesium fluoride is 4% by weight. as a result,
It was found that when the L value was 40 or less, the relationship was almost inversely proportional. When the L value exceeds 40, the effect of the color tone change is considerably reduced, and when the L value exceeds 60, the effect of the color tone change almost disappears. This tendency was similarly observed when the light interference pigment was other than magnesium fluoride.

The measurement of the L value may be performed by placing the tip of the measuring head of the color difference meter on the dark color layer 4. At that time, the color difference meter can measure a small area with a measurement diameter as small as possible, and the illumination optical system is designed in accordance with the 45-0 method defined in JIS Z8722. Is preferably used.
As a commercially available color difference meter, there is a color difference meter CR-321 manufactured by Minolta Co., Ltd.

Examples of the material of the dark color layer 4 include polyvinyl resins, polyamide resins, polyester resins, acrylic resins, polyurethane resins, polyvinyl acetal resins, polyester urethane resins, cellulose ester resins, and alkyd resins. Using resin as a binder,
It is preferable to use a coloring ink containing a pigment or dye of an appropriate color as a coloring agent. As a method for forming the dark layer 4,
A normal printing method such as an offset printing method, a gravure printing method, and a screen printing method may be used. The dark layer 4
Depending on the pattern to be expressed, it may be provided entirely or partially.

Further, the base sheet 2 itself may be configured as the dark layer 4 so as to have the function of the dark layer 4. When the surface of the base sheet 2 has a color that satisfies the condition of the dark layer 4, the step of forming the dark layer 4 can be omitted.

In particular, the content of the light interference pigment in the color changing layer 3 is 0.5 to 4.0% by weight, and the L value of the dark color layer 4 depends on the content (weight) of the light interference pigment in the color changing layer 3. %) × 8 or less. The effect of light interference varies depending not only on the content of the light interference pigment, but also on the L value of the dark layer 4,
In particular, when the content of the light interference pigment is 4% by weight or less,
It can be seen that there is a substantially inversely proportional relationship with the L value of the dark layer 4. By utilizing this, by providing the dark layer 4 of a plurality of colors (L values), light interference can be expressed stepwise (that is, light interference effect of several steps). However, if the ratio of the light interference pigment is low, the effect itself is reduced, so that the range of the usable dark color layer 4 (L value) is limited.

Under the color changing layer 3, L ^* a ^* b of CIE (International Commission on Illumination) 1976 (JIS Z8729) is used.
^* You may form the light color layer 5 whose L value in a color system is 60 or more. When the light color layer 5 is located below the color change layer 3,
The effect of light interference by the color changing layer 3 does not occur, and the color development of the bright color layer 5 can be seen as it is. Therefore, the effect of light interference occurs only at the portion where the color changing layer 3 and the dark color layer 4 overlap, and the effect of light interference can be exerted in a pattern different from the pattern of the color changing layer 3. For example, by disposing a partial dark color layer 4 below the discoloration layer 3 formed over the entire surface and further disposing a full light color layer 5 thereunder,
A portion where the effect of optical interference occurs and a portion where the effect does not occur can be arbitrarily set (see Examples 1 and 2 and FIGS. 1 to 4).
The same effect can be obtained by disposing a partial light-color layer 5 below the discoloration layer 3 formed over the entire surface, and further disposing the entire dark-color layer 4 thereunder. .

The light color layer 5 is different from the dark color layer 4 except for the L value.
In the same manner as described above, an ink film or a base sheet 2 can be formed.

Further, on the discoloration layer 3, a blank pattern pattern layer 6 may be formed. The cut pattern pattern layer 6 is a layer that is partially formed so as to be located closer to any of the other constituent layers of the decorative sheet 1, and the expression by the decorative sheet 1 can be more complicated. it can.

In particular, when the L value of the underlying layer is less than 60, especially less than 30, it is not preferable because the color tone changes also in portions other than the dark layer 4. Therefore, the L value of the underlying layer is 6
If it is less than 0, especially less than 30, firstly, a blank pattern layer 6 is formed as a negative pattern layer of a desired pattern, and then a discoloring layer 3 and a dark layer 4 are formed thereunder. Does not change in color tone (see Example 3, FIGS. 5 to 6).

The decorative sheet 1 may be provided with a metal thin film layer. The metal thin film layer is for expressing metallic luster, and is formed by a vacuum evaporation method, a sputtering method, an ion plating method, a plating method, or the like. Metals such as aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, and zinc, and alloys or compounds thereof are used according to the metallic luster color to be expressed. The metal thin film layer may be partially formed. When providing the metal thin film layer, an anchor layer may be provided in order to improve the adhesion of the metal thin film layer.

Further, an adhesive layer may be provided if necessary. The adhesive layer is for bonding the decorative sheet 1 on a molding resin or the like. As the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for a material such as a molding resin is appropriately used.
Further, it is also possible to form an adhesive layer by bonding sheets having adhesive properties by a laminating method or the like.

Further, if necessary, the overcoat layer 8 may be formed. The overcoat layer 8 is a decorative sheet 1
This is a layer for protecting. As the overcoat layer 8, a thermosetting resin, an ultraviolet curable resin, an electron beam curable resin, or the like can be used.

As described above, when the color-changing layer 3 and the dark-color layer 4 of the decorative sheet 1 satisfy the above-mentioned conditions, the color tone changes depending on the direction of the light beam, and the effect is maximized. The decorative sheet 1 can be obtained. For example, in the case of a wood grain pattern, by changing from a color (brown to white yellow) close to the base color to a pipe color (dark to black), the pipe portion of the wood grain can be raised or hidden. it can.

The decorative sheet 1 having the above structure can be used alone. Also, by decorating the decorative sheet 1 on the surface of the molded product 9, a decorative molded product can be obtained.

Further, when the insert molding method is used, a decorative molded product having a three-dimensional shape can be easily obtained.

In order to apply the decorative sheet 1 to the insert molding method, if necessary, the decorative sheet 1 may be preformed so as to conform to the mold shape. The preforming may be performed by a vacuum press forming method, a vacuum forming method, a hydraulic forming method, a high pressure forming method, a die press forming method, etc., which are generally known as a preforming method.

Next, the decorative sheet 1 is placed in a mold having a cavity, and a molten resin is injected into the mold to obtain a molded article 9 in which the decorative sheet 1 and the molten resin are integrated.

As the molding resin, it is preferable to use a resin that can be filled in the mold cavity and molded by an injection molding method. For example, acrylic resin, acrylonitrile styrene resin, polycarbonate resin, polypropylene resin,
Silicone resin or the like can be used.

A decorative molded article can be obtained as described above.

When the molded article 9 has an L value of 40 or less on the surface, the color of the molded article 9 itself is used, and the dark layer 4 of the decorative sheet 1 can be omitted. . The molded product 9 has an L value of 6 on its surface.
In the case where a material having a value of 0 or more is used, the light-color layer 5 of the decorative sheet 1 can be omitted by using the color of the molded article 9 itself.

[0051]

Example 1 A white vinyl chloride resin film (L = 81) having a thickness of 500 μm was used as a base sheet 2 and a light-color layer 5, and a dark layer 4 was formed thereon using a urethane resin-based black ink as a gravure. A vertical straight line pattern (L = 18) is formed by a printing method, and a urethane resin-based transparent ink containing 3% by weight of a magnesium fluoride mixture is used as a color changing layer 3 thereon, and a straight line in a horizontal direction is formed by a gravure printing method. A pattern was formed, and a hard coat layer 8 was formed thereon by a gravure printing method using a urethane resin-based ultraviolet curable ink to obtain a decorative sheet 1 (see FIGS. 1 and 2).

When the decorative sheet 1 thus obtained was cut into a card size, when viewed from directly above or at an oblique angle of 45 degrees, the dark layer 4 formed of a linear pattern in the vertical direction.
Only a portion where the color changing layer 3 formed of a linear pattern in the left-right direction overlaps was a card of a carbon fiber cloth pattern having a very three-dimensional effect in which the color tone was changed.

(Example 2) A white-orange polypropylene resin film (L = 72) having a thickness of 100 μm was used as the base sheet 2 and the light-color layer 5, and a urethane resin-based black ink was used as the dark layer 4 thereon. A first conduit pattern (L = 15) is formed by a gravure printing method, and a thickness 1 containing 3% by weight of a magnesium fluoride mixture as a discoloration layer 3 thereon is formed.
After adhering a transparent polypropylene film of 00 μm, wiping was performed and filled with a urethane resin-based black ink to form a second conduit pattern pattern that was a pattern pattern layer 6 to obtain a decorative sheet 1 (FIGS. 3 to 3). 4).

In the decorative sheet 1 thus obtained, when viewed from directly above, only the first conduit pattern portion where the discoloration layer 3 and the dark color layer 4 overlap changes the color tone, and a very vivid woodgrain It became a building material decorative sheet.

EXAMPLE 3 A transparent acrylic film having a thickness of 125 μm was used as the base sheet 2, and on the back surface thereof, a cut pattern pattern layer expressing the first conduit pattern by a gravure printing method using a vinyl resin black ink. 6 is formed, and then a blank pattern pattern layer 7 representing a portion excluding the second conduit pattern is formed using a vinyl resin-based brown ink,
Next, a decorative sheet 1 was obtained by forming a color-changing layer 3 by gravure printing using an acrylic resin-based transparent ink containing 3% by weight of a magnesium fluoride mixture so as to cover the second conduit pattern.

Next, the decorative sheet 1 is inserted into an injection mold and integrated with a black acrylonitrile butadiene styrene molding resin (L = 16) to form a molded article 9 which also functions as the dark layer 4. A decorative molded product was obtained (see FIGS. 5 and 6).

When viewed from directly above, the decorative molded article obtained in this manner has a very vivid color change only in the second conduit pattern where the discolored layer 3 and the molded article 9 overlap. A wood-grained simultaneously painted product was obtained.

[0058]

Since the present invention has the above-described structure, it has the following effects.

The decorative sheet of the present invention has a color-change layer containing 0.5 to 20% by weight of a light interference pigment and L ^* a of CIE (International Commission on Illumination) 1976 (JIS Z8729).
^* B ^{* At} least a dark color layer having an L value of 40 or less in the color system is formed, and the dark color layer is positioned below the discoloration layer. It has a symbol with a pattern.

Further, the decorative molded article of the present invention is characterized in claim 1
Since the decorative sheets described in Nos. To 7 are laminated on the surface of the molded product, the decorative molded product having a three-dimensional design can be easily obtained by changing the color tone according to the reflection angle of the light beam. Things.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a decorative sheet of the present invention.

FIG. 2 is a plan view showing one embodiment of a decorative sheet of the present invention.

FIG. 3 is a sectional view showing one embodiment of the decorative sheet of the present invention.

FIG. 4 is a plan view showing one embodiment of a decorative sheet of the present invention.

FIG. 5 is a sectional view showing one embodiment of a decorative sheet of the present invention.

FIG. 6 is a plan view showing one embodiment of a decorative sheet of the present invention.

FIG. 7 is a graph showing the relationship between the content of the magnesium fluoride mixture in the color changing layer and the degree of color tone change.

FIG. 8 is a graph showing the relationship between the L value of a dark color layer and the degree of color tone change.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decorative sheet 2 Base sheet 3 Color change layer 4 Dark color layer 5 Light color layer 6 Cut pattern pattern layer 7 Cut pattern pattern layer 8 Overcoat layer 9 Molded product

 ────────────────────────────────────────────────── ─── Continuing on the front page F term (reference) 4F100 AA06H AK01A AK01B AK07 AK15 AK51 AR00A AR00B AR00C AT00D AT00E BA02 BA03 BA04 BA05 BA07 BA10B BA10C BA10D CA13A CC00A CC00B DC14C GB08 GB32 GB71 JBN30 JBN30 4F206 AG03 JA07 JB13 JB19 JB22 JQ81

Claims (13)

[Claims] 1. A discoloring layer containing 0.5 to 20% by weight of a light interference pigment, and a CIE (International Commission on Illumination) 1976 (J
A decorative sheet, wherein at least a dark layer having an L value of 40 or less in L ^* a ^* b ^* color system of IS Z8729) is formed, and the dark layer is located below the discoloring layer. 2. The content of the light interference pigment in the color-changing layer is 0.5
2. The decorative sheet according to claim 1, wherein the L value of the dark color layer is a value equal to or less than the content (% by weight) of the light interference pigment in the color change layer × 8. 3. The decorative sheet according to claim 1, wherein the color-changing layer comprises an ink film or a base sheet. 4. The decorative sheet according to claim 1, wherein the dark layer comprises an ink film or a base sheet. 5. A light-colored layer having an L value of 60 or more in an L ^* a ^* b ^* color system of CIE (International Commission on Illumination) 1976 (JISZ8729) is formed under the color-changing layer. 4. The decorative sheet according to any one of 4. 6. The decorative sheet according to claim 5, wherein the light-colored layer comprises an ink film or a base sheet. 7. The decorative sheet according to claim 1, wherein a patterned pattern layer is formed on the color changing layer. 8. A decorative molded article wherein the decorative sheet according to claim 1 is laminated on the surface of the molded article. 9. A decorative sheet having at least one discoloring layer containing 0.5 to 20% by weight of a light interference pigment on one surface of a base sheet is a decorative sheet of CIE (International Commission on Illumination) 197.
6 (JIS Z8729). A decorative molded product laminated on a molded product having an L ^* a ^* b ^* color system L value of 40 or less. 10. The content of the light interference pigment in the color-changing layer is 0.1%.
The decorative molded article according to claim 9, wherein the L value of the molded article surface is 5 to 4.0% by weight, and the content of the light interference pigment in the discoloration layer (% by weight) x 8 or less. 11. A light color layer having an L value of 60 or more in an L ^* a ^* b ^* color system of CIE (International Commission on Illumination) 1976 (JIS Z8729) is formed below the color change layer. The decorative molded product according to any one of items 1 to 10. 12. A discoloring layer containing 0.5 to 20% by weight of a light interference pigment on one surface of a base sheet, and L ^{* of} CIE (International Commission on Illumination) 1976 (JIS Z8729) ^.
A decorative sheet in which at least a dark layer having an L value of 40 or less in the a ^* b ^* color system is formed, and the dark layer is located below the discoloring layer, is a CIE (International Commission on Illumination) 1976 (J
A decorative molded product, which is laminated on a molded product having an L ^* a ^* b ^* color system L value of IS Z8729) of 60 or more. 13. The decorative molded article according to claim 9, wherein a patterned pattern layer is formed on the discoloring layer.