JP6735614B2 - Skin material and method for manufacturing skin material - Google Patents

Description

The present disclosure relates to a skin material and a method for manufacturing the skin material.

Automotive interior parts such as instrument panels, door trims, seats, ceilings, interior trim parts, seats, ceilings and other railway vehicle and aircraft interior parts, furniture, shoes, footwear, bags, interior/exterior parts for construction, clothing coverings and linings, walls As a covering material, a synthetic resin skin material having excellent durability is often used instead of a natural leather or a fiber sheet.
Various studies have been made for the purpose of imparting various design properties to synthetic skin materials. By applying a design with a sense of brightness to the synthetic skin material, it is possible to give the skin material a characteristic appearance, and it is expected to be applied to various applications.

Regarding the formation of a design with a sense of brightness, for example, a metallic tone ink is applied to the convex portion of the embossed thermoplastic resin layer, and one side of the thermoplastic base sheet on which the ink application portion of the color pattern is formed is formed. A surface layer material having a three-dimensional design obtained by thermocompression bonding with a thermoplastic resin layer via an adhesive layer containing metallic particles has been proposed (see, for example, Patent Document 1).
Further, there is proposed a skin material used for imparting a design property to a molded article or the like, which has a first layer in which a glitter material is unevenly distributed on a visible side and a second layer laminated on a back surface. (For example, see Patent Document 2). Further, there has been proposed a leather having an ink layer containing a thin metal film strip and a polyurethane resin layer on a synthetic leather and a natural leather in this order (see, for example, Patent Document 3).

JP-A-09-201928 JP, 2005-153222, A JP, 2007-224471, A

Since the method described in Patent Document 1 requires embossing with excellent design, there is room for improvement in terms of simplicity of the manufacturing method. For this reason, for example, it is required to manufacture a skin material having a bright appearance and a highly designed appearance by a commonly used printing apparatus.
For the skin material described in Patent Document 2, for example, a coating material containing a glitter material is applied to a mold of a molded product, and the glitter material is allowed to settle in the coating layer, whereby the glitter material is unevenly distributed on the surface of the molded product. Since the process is required, the manufacturing process is complicated. In addition, since the glittering material such as a metal is unevenly distributed near the surface of the first layer, the glittering material is easily peeled off. Further, when the glittering material is a metal, the glittering material is oxidized by being contacted with the outside air, and thus the appearance of the glittering material is high. May decrease.
In the skin material described in Patent Document 3, gloss is imparted by orienting the metal thin film strips in a direction parallel to the surface of the object to be coated, but the metal thin film strips should be uniformly dispersed in the ink. In addition, it was difficult to arrange the thin metal film strips in a parallel direction and to apply them by a normal applying device even during application.

When a design with a sense of brightness is produced by using a printing means such as gravure printing, generally, a metallic ink containing a metallic pigment, a fine metallic foil or the like, a metallic paint, or the like is used. The design formed by the metallic ink containing the metallic pigment or the like is originally limited to the design having the hue of the metallic pigment or the like, and the hue expression is limited. Further, metallic ink or the like is a composition in which a metal pigment is dispersed in a matrix such as a resin, and has an appearance with a brightness lower than that of the metal pigment itself.
Also in the skin materials described in Patent Documents 2 and 3, the hue of the design having a sense of brightness is limited to the hue of the metal pigment or the like to be contained, and it is difficult to form various designs. ..

An object of one embodiment of the present invention is to provide a skin material that can be easily manufactured, has a good sense of brightness, and can express various hues, and that has a high designability.
Another embodiment of the present invention is to provide a method for manufacturing a skin material which has a good sense of brightness, can express various hues, and can manufacture a skin material with high designability by a simple process. And

Means for solving the above problems include the following embodiments.
<1> A dark color layer containing a resin and having a reflection density (Dρ) of 1.55 or more, a bright material-containing layer provided on at least a part of the dark color layer and containing a bright material and a resin, and the bright material. A skin material, which is provided on the containing layer, contains a coloring agent other than the glittering material, and a resin, and has a transparent coloring layer having a visible light transmittance.
<2> The skin material according to <1>, wherein the dark color layer is provided on a base material or a temporary support.
<3> The skin material according to <1> or <2>, wherein the dark color layer is a black resin layer containing at least one colorant selected from the group consisting of black pigments and black dyes.
<4> The skin material according to at least one of <1> to <3>, in which the luster material-containing layer is provided in an area of 5% to 80% with respect to the total area of the dark color layer in a plan view. ..
<5> The skin material according to at least one of <1> to <4>, which contains at least one selected from the group consisting of metal pigments and pearl pigments.

<6> A step of forming a dark color layer having a reflection density of 1.55 or more using the first resin composition containing a resin and a colorant, and a resin on at least a part of the formed dark color layer. A step of applying a second resin composition containing a glitter material by a printing method to form a glitter material-containing layer, and a resin on the dark color layer having the glitter material-containing layer formed at least in part And a step of forming a transparent colored layer having visible light transmittance by applying a third resin composition containing a coloring agent other than the glittering material.
<7> The method for producing a skin material according to <6>, wherein the step of forming the dark color layer includes a step of forming a film of a first resin composition containing a resin and a colorant.
<8> The step of forming the dark color layer includes the step of applying the first resin composition containing a resin and a colorant onto a substrate or a temporary support, and the step of forming the skin material according to <6> Production method.

According to an embodiment of the present invention, there is provided a skin material which can be easily manufactured, has a good sense of brightness, can express various hues, and has a high designability.
According to another embodiment of the present invention, there is provided a method for manufacturing a skin material, which has a good sense of brightness and is capable of expressing various hues, and which can manufacture a skin material with high designability by a simple process. It

It is a schematic sectional drawing which shows the skin material which is one Embodiment of this invention. 2A to 2C are schematic views for explaining an example of the method for manufacturing the skin material according to the present embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The constituent elements indicated by the same reference numerals in the drawings mean the same constituent elements. It should be noted that duplicate descriptions and reference numerals in the embodiments described below may be omitted.
The present invention is not limited to the following embodiments and includes various modifications without departing from the gist of the present invention.

(Surface material)
FIG. 1 is a schematic cross-sectional view showing a skin material which is an embodiment of the present invention.
The skin material 10 of the present embodiment contains a resin and has a dark color layer 12 (hereinafter, also referred to as a dark color layer 12) having a reflection density of 1.55 or more, and at least a part of the dark color layer 12. On the dark color layer 12 having the bright material-containing layer 14 (hereinafter, sometimes referred to as the bright material-containing layer 14) and the bright material-containing layer 14 at least in part. The skin material 10 is provided, which includes a transparent coloring layer 16 (hereinafter, may be simply referred to as a transparent coloring layer 16) that includes a coloring agent other than the glittering material and has a visible light transmittance.

The skin material of the present embodiment has a transparent colored layer 16, a bright material-containing layer 14, and a dark color layer 12 in this order from the visible side, and the transparent colored layer 16 and the bright material-containing layer 14 are provided. , And the dark color layer 12 at least three layers may be provided. In addition, as long as the effect of this embodiment is not impaired, the skin material may further include any layer that can be provided.
Examples of the optional layer include, but are not limited to, a surface layer provided on the outermost layer on the visible side, an adhesive layer for improving the adhesiveness between the layers, and a cushion layer for improving the feel of the skin material.
In the skin material 10 shown in FIG. 1, a mode is described in which the transparent coloring layer 16 has a surface layer 18 that does not contain a coloring agent and has visible light transmittance. However, the skin material 10 does not necessarily have to include the surface layer 18.

Conventionally, in the method for manufacturing a skin material having a glitter material-containing layer, in order to achieve a sense of brightness, the glitter material-containing layer is provided on the entire surface of the base material, and a hiding layer having an arbitrary pattern is provided on the glitter material-containing layer. Therefore, a design having a glittering property was formed. However, with this configuration, it is difficult to conceal the glittering material-containing layer with the dark-colored concealing layer, and it is necessary to thicken the concealing layer or to provide two or more concealing layers, and the manufacturing process It was complicated. Further, there is a problem that the formed design can express only the hue of the glitter material itself.

Although the operation of this embodiment is not clear, it is estimated as follows.
In the skin material of the present embodiment, at least a part of the dark color layer, by providing a bright material-containing layer, the contrast between the dark color layer and the bright material-containing layer is good, on the conventional bright material-containing layer. As compared with the case where the patterned dark color layer is provided by printing, the glittering material-containing layer is more conspicuous and the sense of brightness is further improved.
Furthermore, by having a transparent colored layer on the bright material-containing layer, the bright material in the bright material-containing layer is a coloring agent contained in the transparent colored layer by visually observing the bright material-containing layer through the transparent colored layer. It will be visually observed in a hue according to, and the colored appearance with a sense of brightness has a so-called neon-like brightness feeling with an arbitrary hue, and is considered to have achieved unprecedented designability. ing.
That is, rather than directly viewing the glittering material-containing layer, not only by imparting an arbitrary hue to the glittering material-containing layer by visually observing through the transparent coloring layer, but the gloss of the transparent coloring layer is It is considered that the skin material has improved appearance of brightness and can express various hues with a simple structure and has a better appearance of appearance.
Another advantage is that the skin material of the present embodiment can be easily manufactured by using a commonly used known film forming apparatus, coating apparatus, printing apparatus, or the like.
The skin material of the present embodiment is not limited to the above estimation mechanism.

Hereinafter, each layer of the skin material of the present embodiment will be described in detail.

<Dark layer>
The dark color layer 12 in the skin material 10 of the present embodiment is a colored resin layer containing a resin and having a reflection density of 1.55 or more.
The reflection density (Dρ) in this specification can be measured by an optical system having a reflection density defined in ISO 5/4.
The reflection density is calculated by the following formula.
Dρ=−log ₁₀ [φρ/φi]
In the above formula, φi represents incident light, and φρ represents reflected light.

The higher the value of Dρ, the more visible the color is. For example, Dρ of cyan is about 1.55, and the target value of Dρ for black is usually 1.70.
The reflection density of the dark color layer is 1.55 or more. The reflection density of the dark color layer is preferably 1.60 or more, and more preferably 1.65 from the viewpoint that the contrast with the luster material-containing layer is clear and the high brightness of the skin material is better. That is all.

The hue of the dark color layer is preferably black, dark blue, dark brown, dark gray or the like.
The dark color layer can be formed by a resin composition containing a resin and a colorant. From the viewpoint that the effect of the present embodiment is better, the dark color layer is preferably a black resin layer containing at least one colorant selected from the group consisting of black pigments and black dyes.

(resin)
The resin used for forming the dark color layer is not particularly limited, and any resin can be used as long as it has film-forming properties and the formed layer has required strength and durability.
Examples of the resin that can be used for forming the dark color layer include thermoplastic resins such as polyvinyl chloride (PVC), polyvinylidene chloride, acetate, polyethylene, polypropylene, polyester, polystyrene, polycarbonate, polyvinyl alcohol, and polyamide. To be Among them, polyvinyl chloride, polymethylmethacrylate (PMMA) and the like are preferable from the viewpoint of good durability and flexibility.

(Colorant)
The colorant that can be used in the dark color layer can be selected from pigments and dyes. From the viewpoint of durability, it is preferably a pigment.
The pigment used for the dark color layer can be appropriately selected and used from pigments that can form a resin layer having a low reflectance.
Examples of the pigment include known organic pigments and inorganic pigments. Examples of organic pigments and inorganic pigments include black pigments, blue pigments, cyan pigments, green pigments, violet pigments, and brown pigments from the viewpoint of high reflection density.
Among them, black pigments, blue pigments, brown pigments and the like are preferable, and black pigments are more preferable, from the viewpoint of high reflection density.

There is no particular limitation on the black pigment that can be used to form the dark color layer.
As the black pigment, a known black pigment, for example, a black pigment selected from organic pigments and inorganic pigments can be used.
From the viewpoint that the dark layer formed has a high reflection density, examples of the black pigment include carbon black, titanium carbon, titanium oxide pigments such as iron oxide and titanium black, graphite, and aniline black. , Carbon black and the like are preferable.
When the dark color layer is the black resin layer, a pigment or dye other than the black pigment may be used in combination for the purpose of adjusting the reflection density and the hue.
Examples of pigments other than black include C.I. I. Pigment Violet 19, 23, 29, 32, C.I. I. Pigment Blue 15:1, 15:3, 15:6, 16, 22, 60, 66, C.I. I. Pigment Green 7, 36, 37, 58, C.I. I. Pigment Brown 1, 2, 24, and the like, but are not limited thereto.

A dye may be used as the colorant. As the dye, for example, a well-known dye described in documents such as "Handbook of Dyes" (edited by the Society of Synthetic Organic Chemistry, published in 1970) or a dye available as a commercial product may be appropriately selected and used. You can
Examples of dyes include azo dyes, metal complex salt azo dyes, pyrazolone azo dyes, naphthoquinone dyes, anthraquinone dyes, phthalocyanine dyes, carbonium dyes, quinone imine dyes, methine dyes, cyanine dyes, squarylium dyes, pyrylium salts, and metal thiolate complexes. Dyes can be mentioned, and from these dyes, it is possible to select and use a dye that can produce color with high reflection density, a dye that can be used in combination with a black pigment to adjust at least one of reflection density and tint of the dark color layer it can.

In the dark color layer, only one kind of colorant may be used, or two or more kinds thereof may be used.
The content of the colorant in the dark color layer, and the total content of two or more colorants in the dark color layer, the total content of the resin composition capable of forming the dark color layer from the viewpoint that the reflection density can be further increased. The amount is preferably 0.5% by mass to 30% by mass, more preferably 1% by mass to 15% by mass, based on the solid content.
When the content of the colorant is 0.5% by mass or more, the required reflection density can be achieved even if the dark color layer has a small thickness. When the content of the colorant is 30% by mass or less, the formability of the dark color layer becomes better.

(Additive)
The resin composition used for forming the dark color layer may include additives other than the resin and the colorant.
Examples of the additive include a plasticizer for improving the flexibility of the dark color layer, a surfactant for improving the uniformity of the dark color layer, a solvent, a lubricant, a stabilizer, a flame retardant, a filler and the like. ..
As the plasticizer, when polyvinyl chloride is used as the resin, for example, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, octyl phthalate, tributyl phosphate, triphenyl phosphate, butyl adipate, n-adipate n- Hexyl, n-octyl adipate, dibutyl sebacate, chlorinated diphenyl and the like can be mentioned.

(Structure and production of dark color layer)
The dark layer itself may have a function as a base material. That is, by providing the glittering material-containing layer and the transparent coloring layer on the dark color layer as the base material, it can be used for various purposes as an independent skin material.
The dark color layer can be obtained by forming a resin composition containing a resin and a colorant into a film by a known method. Examples of the film forming method include a melt extrusion method using a die, a calender method, and a coater method.
If the density required for the dark color layer, that is, the reflection density is 1.55 or more, a dark color resin sheet such as a commercially available black sheet may be used as it is as the dark color layer.

The thickness of the dark color layer is preferably in the range of 60 μm to 2 mm, and more preferably in the range of 80 μm to 250 μm from the viewpoint that the contrast with the glittering material-containing layer is better and that practically sufficient strength and flexibility can be easily obtained. More preferable.

In addition, the dark color layer can be formed on the temporary support or the base fabric by a coating method depending on the purpose of use of the skin material.
When a skin material having the above-mentioned layer structure is formed on the temporary support or the base material, the dark layer is a layer on the back surface on which the luster material-containing layer is not provided, for example, the base material is hidden. The thickness can be made smaller than the preferable thickness of the dark color layer described above as long as the strength is not a problem.

<Glitter-containing layer>
The skin material 10 of the present embodiment has the glittering material-containing layer 14 on at least a part of the dark color layer 12.
As the glittering material, any material can be used without particular limitation as long as it is a material capable of imparting glittering property, gloss and the like to the glittering material-containing layer.
Examples of the glittering material include metallic pigments having a luster, pearl pigments and mica.
Examples of the metallic pigment having luster include an aluminum pigment and a silver pigment.
Examples of the pearl pigment include titanium oxide-coated mica (titanium mica), titanium oxide-coated glass flakes, and titanium oxide-coated talc.
Of these, high-luminance metal pigments such as aluminum pigments and silver pigments are preferable from the viewpoints of good luminance and better durability.

The glitter material-containing layer can be formed using the resin composition containing the resin and the glitter material described above.
Examples of the resin used for forming the glittering material-containing layer include resins used in printing inks, such as polyurethane, vinyl chloride resin, and acrylic resin.
The bright material-containing layer may contain only one kind of the bright material, or may contain two or more kinds of the bright material.
The content of the glitter material in the resin composition containing the glitter material is 10% by mass to 99.9 mass% with respect to the total solid content of the resin composition containing the glitter material. %, preferably 15% by mass to 90% by mass, more preferably 25% by mass to 60% by mass.
When the content of the brightening material is 10% by mass or more, the brightness of the formed brightening material-containing layer becomes better and the contrast with the dark color layer becomes better. When the content of the bright material is 99.9% by mass or less, the bright material-containing layer suitable for the present embodiment can be formed.

Commercially available metallic inks, pearl inks, and the like can be used for forming the glittering material-containing layer, and it is preferable to use metallic inks, especially general silver metallic inks.
Examples of commercially available metallic inks include Dainichi Seika Kogyo Co., Ltd., metallic printing ink LR-Ki series, Megami Ink Kogyo Co., Ltd., metallic ink series, DIC, and metallic ink.
Examples of commercially available pearl inks include pearl inks marketed by Merck Ltd. and BASF Ltd.
In the skin material of the present embodiment, by having a transparent colored layer described below, it is possible to impart an arbitrary hue to the glittering material-containing layer. Therefore, as the metallic ink, it is possible to use general-purpose silver without using an expensive colored metallic ink. By using the ink, a variety of uses can be realized.

In the case of forming the glittering material-containing layer in a pattern on the dark color layer described above, a known printing method can be applied. The printing method is not particularly limited, and may be appropriately selected depending on the characteristics of the resin composition containing the glitter material or the metallic ink. Examples of the printing method include offset printing, screen printing, inkjet printing, and gravure printing.

The shape of the glittering material-containing layer provided on at least a part of the dark color layer is not particularly limited, and a desired shape can be appropriately provided. Examples of the shape of the glitter material-containing layer include a stripe shape, a wave shape, a dot shape, and an irregular shape, and the glitter material-containing layer can be formed in an arbitrary pattern. Further, it may be provided intermittently or continuously on the dark color layer.
The glittering material-containing layer is preferably provided in an area of 5% to 80%, and more preferably in an area of 5% to 50%, with respect to the total area of the dark layer in plan view. By forming the glittering material-containing layer in the above area ratio, the contrast between the dark color layer and the glittering material-containing layer becomes better, and the designability is enhanced.
The film thickness of the glittering material-containing layer is not particularly limited as long as it can cover the dark color layer, and for example, it is preferably in the range of 0.5 μm to 300 μm, and more preferably in the range of 1 μm to 150 μm. It is preferably in the range of 1 μm to 10 μm. When the thickness is in the above range, a decrease in high brightness due to a difference in thickness between a region having a glittering material-containing layer and a region having no glittering material-containing layer is suppressed when the transparent colored layer is formed, and the design is improved.

<Transparent colored layer>
The skin material 10 of the present embodiment has the transparent colored layer 16 on the dark color layer 12 having the glittering material-containing layer 14 on at least a part thereof.
The transparent colored layer is a resin layer that contains a colorant other than the glittering material and has visible light transmittance.
In the present specification, the visible light transmittance in the transparent colored layer means that the brightness of the bright material contained in the bright material-containing layer 14 provided below the transparent colored layer 16 can be confirmed through the transparent colored layer 16. Visible light transmittance is such that the pattern of the glittering material-containing layer 14 can be clearly seen.

Further, when the visible light transmittance of the transparent colored layer is evaluated from another viewpoint, for example, a test of the total light transmittance of a plastic-transparent material defined in JIS (Japanese Industrial Standard) K 7361-1 (1997). It can be measured according to the method (Part 1: Single beam method).
As a measuring method, a composition for forming a transparent colorant on the surface of a plastic plate having excellent transparency (polyvinyl chloride plate: thickness 2 mm, total light transmittance of polyvinyl chloride plate described in JIS: 87.0%) When the total light transmittance of the laminated body was measured according to JIS K 7361-1 described above, The total light transmittance of the laminate is preferably 30% or more, more preferably 50% or more.

As the colorant that the transparent colored layer may include, a decrease in the brightness of the glittering material-containing layer during observation through the transparent coloring layer is suppressed, and the pattern formed by the glittering material-containing layer is in a colored state. From the viewpoint of being able to clearly and clearly see, it is preferable to use a colorant that does not easily block visible light.
Examples of the colorant that can be contained in the transparent colored layer include dyes and pigments having a fine particle size. The dye is preferably a dye having a hue that does not easily impair the visible light transmittance, and the pigment has a particle size that hardly causes light reflection, for example, an average particle size of 0.7 μm or less, and more preferably an average particle size of 0.4 μm or less. Examples include pigments having a particle size.
It is preferable to use a pigment from the viewpoints that the effects of the present embodiment are better exhibited and the durability is better.
Further, a commercially available color gravure ink may be used for forming the transparent colored layer. Examples of commercially available gravure inks include gravure inks marketed by DIC Co., Ltd. and Toyo Ink Co., Ltd.

The hue of the colorant contained in the transparent colored layer may be selected according to the design of the skin material.
When the above-described glittering material-containing layer is locally present in a pattern on the surface of the dark color layer, for example, when having a stripe-shaped pattern, the glittering material-containing layer is provided through the transparent colored layer, It is possible to form a high-intensity pattern having various hues by the transparent colored layer, which is visually observed in a hue according to the colorant contained in the transparent colored layer. Furthermore, by having a transparent colored layer, a design having a neon-tone brightness feeling and an excellent appearance is formed in combination with the contrast effect between the dark color layer and the glittering material-containing layer.

The transparent colored layer can be formed by applying a resin composition containing a resin and a colorant other than the glittering material.
The formation region of the transparent colored layer can be selected according to the purpose. Usually, it is provided over the entire surface of the dark color layer having the glittering material-containing layer, but not limited to this.
For example, when the design of both the brightness of silver and the brightness of colored neon tone is required, the transparent colored layer may be formed only in the region where the brightness of colored neon tone is desired. ..
The thickness of the transparent colored layer is preferably 1 μm to 300 μm, more preferably 2 μm to 50 μm. When the film thickness is in the above range, the decrease in the brightness of the glittering material contained in the glittering material-containing layer is further suppressed, and the neon hue can be more effectively imparted.

<Other layers>
The skin material of the present embodiment may be provided with other layers in addition to the dark color layer, the luster color material-containing layer and the transparent color layer, as long as the effect of the present embodiment is not impaired.
Other layers include a surface layer, an adhesive layer, a cushion layer and the like. Further, as described above, a base material such as a base cloth may be further provided on the dark color layer side not having the glittering material-containing layer, and a temporary support is provided and the temporary support is peeled off. For example, the skin material of the present embodiment can be attached and used on the surface of the molded body.
Hereinafter, other layers that can be included in the skin material of the present embodiment will be described.

[Surface layer]
The skin material 10 of the present embodiment may have a surface layer 18.
In order to improve the visibility of the glittering material-containing layer, the transparent colored layer preferably has a thickness of 20 μm or less as described above. Therefore, for the purpose of protecting the design surface and further improving the durability of the skin material, it is preferable to further provide a surface layer having a function as a protective layer on the transparent colored layer.
The surface layer is preferably provided on the entire surface of the skin material using a resin composition containing a highly transparent resin from the viewpoint that the surface visibility can be protected without impairing the visibility of the design.
Examples of the highly transparent resin include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), and acrylic resins.
The resin contained in the surface layer preferably contains no colorant from the viewpoint of protecting the surface without impairing the design of the skin material of the present embodiment.
However, a component that does not impair the visibility such as an ultraviolet absorber may be contained.
The surface layer is preferably formed over the entire surface of the transparent colored layer. The coating method generally used for forming the resin layer can be applied to the formation of the surface layer.
The surface layer can be formed by applying a known coating method.
The thickness of the surface layer is not particularly limited, but is preferably 20 μm to 300 μm, more preferably 25 μm to 200 μm, from the viewpoint of the balance between transparency and durability.

[Adhesive layer]
To improve the adhesiveness between the dark color layer 12 and the bright material-containing layer 14, and between the bright material containing layer 14 and the transparent colored layer 16, or to improve the adhesiveness between the dark color layer 12 and a substrate provided as desired. For the purpose, the skin material 10 of the present embodiment may have an adhesive layer (not shown).
The adhesive constituting the adhesive layer is not particularly limited, and examples thereof include an adhesive containing polyurethane, vinyl chloride resin, acrylic resin or the like.
More specifically, for example, (1) two-component curable polyester-based adhesive, (2) two-component curable polyurethane adhesive, (3) two-component curable acrylic pressure-sensitive adhesive, etc. are preferable.
(2) The two-component curable polyurethane adhesive may be either a two-component curable polyether polyurethane adhesive, a two-component curable polyester polyurethane adhesive, or a two-component curable polycarbonate polyurethane adhesive.
The adhesive used for forming the adhesive layer is also available as a commercial product. 3660 [two-component curing type polyurethane adhesive: No-Tape Industry Co., Ltd.], Daicarac 7250NT [two-component curing type polyester adhesive: Daido Kasei Co., Ltd.], TA265 [two-component curing type polyether adhesive: DIC ( Co., Ltd., Crisbon TA205 [polycarbonate-based polyurethane adhesive: DIC Corporation] and the like are preferable.

[Cushion layer]
In the skin material 10 of the present embodiment, a cushion layer (not shown) for improving the feel may be provided on the back surface side of the dark color layer 12 on which the glitter material-containing layer 14 is not provided.
The resin used for forming the cushion layer is not particularly limited, but examples thereof include polyurethane and acrylic resin, and polyurethane is preferable.
Polyurethanes used for the cushion layer include polycarbonate-based polyurethanes, polyether-based polyurethanes, polyester-based polyurethanes and modified products thereof, and polycarbonate-based polyurethanes are suitable when long-term durability is required.
The thickness of the cushion layer is determined according to the purpose. Generally, for example, it can be in the range of 10 μm to 200 μm. The thickness is preferably in the range of 10 μm to 100 μm, and more preferably in the range of 30 μm to 60 μm.
Hardness of the polyurethane to be used as a cushion ^{layer, 98N / cm 2 ~1176N / cm} 2 is suitable in the 100% modulus.

In addition to the resin, the colorant, the luster color material, etc., each of the above-mentioned layers constituting the skin material can further contain other components as long as the effects of the present embodiment are not impaired.
Other components that can be contained in each layer include a solvent, a plasticizer, a crosslinking agent, a crosslinking accelerator, a film forming aid, a surfactant, a flame retardant, a foaming agent, an ultraviolet absorber, a lubricant, a stabilizer, and a filler. Etc.

The skin material of the present embodiment has a dark color layer, a bright material-containing layer provided on at least a part of the dark color layer, and a transparent colored layer, while utilizing the high brightness of the bright material, the bright material. It is possible to impart an arbitrary hue to the luster, and it is possible to achieve an appearance having a neon-tone brightness and excellent in design. Further, as will be described later, a skin material excellent in designability can be easily manufactured using a known device.
Therefore, the skin material of the present embodiment, automobile interior parts, railway vehicle and aircraft interior parts, footwear mainly composed of shoes, seat upholstery, synthetic leather suitable for interior materials, synthetic leather for clothing, bags, wallets. It can be suitably used as an exterior material, etc., and its application range is wide.

[Method of manufacturing skin material]
Next, a method for manufacturing the skin material of this embodiment will be described.
The above-described skin material of the present embodiment is preferably manufactured by the method of manufacturing the skin material of the present embodiment described in detail below.
The method for manufacturing a skin material according to the present embodiment includes a step of forming a dark color layer having a reflection density of 1.55 or more using a first resin composition containing a resin and a colorant, and a step of forming a dark color layer on the formed dark color layer. A step of applying a second resin composition containing a resin and a glittering material by a printing method to form a glittering material-containing layer, and at least a portion of the formed glittering material-containing layer. A step of applying a third resin composition containing a resin and a coloring agent other than the brightening material on the dark color layer to form a transparent colored layer having visible light transmittance.

(Process of forming dark color layer)
This step is a step of forming the dark color layer 12 having a reflection density of 1.55 or more using the first resin composition containing the resin and the colorant.
FIG. 2A is a schematic plan view of the formed dark color layer 12.
This step is a step of preparing a dark color layer, and for example, preparing a commercially available dark color resin sheet as the dark color layer is also included in this step.

The skin material of the present embodiment may be used as it is, may be provided on an arbitrary base material such as a base cloth, or may be applied to a desired surface of a molded body. When forming the skin material of the present embodiment on the surface of the molded body, the skin material of the present embodiment is formed on the temporary support, and then the temporary support is peeled off, and the surface from which the temporary support is peeled off is removed. It can be applied to the surface of a desired molded article as it is or through an optional colored layer.

The step of forming the dark color layer can include a step of forming a film of the first resin composition containing a resin and a colorant. The details of each material used for forming the dark color layer are as described above.
In the step of forming a film of the first resin composition, the first resin composition containing a resin and a dark colorant such as a black pigment is formed into a dark color layer by a conventional method. The film forming method is not particularly limited as long as the required film thickness and reflection density can be achieved. Examples of the film forming method include a melt extrusion method, a calendar method, a coater method, and the like, and the obtained dark color layer is a dark color resin sheet.

The step of forming the dark color layer can include the step of applying the first resin composition containing the resin and the colorant onto the base material or the temporary support.
In the step of applying the first resin composition to the base material or the temporary support, the first resin composition is applied to the base material or the temporary support to form a dark color layer. As a method for applying the first resin composition, a known coating method can be applied.
As a coating method applicable when forming a dark color layer on a substrate or a temporary support, for example, curtain flow coater, extrusion die coater, air doctor coater, blade coater, rod coater, knife coater, Examples of the method include coating using a known coating device such as a squeeze coater, a reverse roll coater, or a bar coater.

(Step of forming a glittering material-containing layer)
In this step, the bright material-containing layer 14 is formed by applying a second resin composition containing a resin and a bright material to at least a part of the dark color layer 12 formed in the previous step by a printing method. Form.
By the printing method, the glittering material-containing layer having gloss is formed in an arbitrary pattern on the dark color layer by the second resin composition containing the resin and the glittering material.
FIG. 2B is a schematic plan view showing an aspect in which the stripe-shaped glittering material-containing layer 14 is formed on the surface of the dark color layer 12 as an example of the patterned glittering material-containing layer 14.
The second resin composition may be a composition prepared by using a resin, a glitter material, and other additives, or may be a commercially available metallic printing ink, pearl ink, or the like.

The printing method for imparting the patterned bright material-containing layer to the dark color layer can be appropriately selected depending on the characteristics of the second resin composition used. For example, when the second resin composition containing a large amount of the glittering material is used, gravure printing, screen printing, offset printing or the like can be applied. Moreover, when the particle diameter of the glittering material contained in the second resin composition is sufficiently small and the viscosity of the composition is low, an inkjet printing method or the like can be applied.
When the second resin composition contains the glittering material, a glittering material-containing layer excellent in hiding property is formed.

(Process of forming a transparent colored layer)
In this step, a third resin composition containing a resin and a coloring agent other than the brightening material is applied onto the dark color layer 12 having the formed brightening material-containing layer 14 in at least a part thereof to form the coloring agent. The transparent colored layer 16 that includes visible light and is transparent is formed.
The transparent colored layer 16 is usually provided over the entire surface of the skin material 10, but is not limited to this.
By selecting the hue of the colorant contained in the transparent colored layer 16, it is possible to impart a desired hue to the high-intensity pattern formed by the bright material-containing layer 14.
FIG. 2C is a schematic plan view showing a state in which the transparent colored layer 16 is formed on the dark color layer 12 on which the stripe-shaped bright material-containing layer 14 is formed. The transparent colored layer 16 is formed on the bright material-containing layer 14, the shape of the bright material-containing layer 14 can be visually confirmed, and the hue in the bright material-containing layer 14 is different from that before the formation of the transparent colored layer 16. The change is schematically shown in FIG.
Since the high brightness of the luster color material-containing layer needs to be visually recognized through the transparent coloring layer, the third resin composition does not include a colorant that blocks light, such as the luster color material, and does not have visible light transmittance. It is preferable to contain a coloring agent that does not significantly inhibit.
When the transparent colored layer is usually provided over the entire surface of the skin material, the above-mentioned coating method can be similarly applied. When the transparent colored layer is provided on a part of the skin material, the above-mentioned printing method can be applied.
The content of the colorant in the transparent colored layer and the amount of the transparent colored layer provided can be appropriately adjusted within a range that does not impair the visibility of the glittering material-containing layer. Further, as described above, the transparent colored layer can be formed using a commercially available gravure ink.

(Arbitrary process)
The method for manufacturing a skin material of the present embodiment may further include at least one of optional steps such as a step of forming a surface layer, a step of forming an adhesive layer, and a step of forming a cushion layer. ..

In the method for manufacturing a skin material of the present embodiment, a general-purpose film forming device, a coating device, a printing device, or the like can be used for forming the dark color layer, the luster color material-containing layer, and the transparent coloring layer.
Further, the dark color layer, the luster color material-containing layer and the transparent color layer can all be formed in one step using the above-mentioned general-purpose device, and the skin having a complicated and unique design can be formed by simple steps. Being able to manufacture a material is one of the advantages in the method for manufacturing a skin material of the present embodiment.

Hereinafter, the skin material of the present embodiment will be specifically described with reference to examples, but the description in this example is not limited.

[Example 1]
Hereinafter, the skin material 10 was manufactured according to the process shown in FIG.
(1. Formation of dark color layer)
Using polyvinyl chloride containing carbon black as a black pigment, a 100 μm thick black resin sheet, which is the dark color layer 12 shown in FIG. 2A, was formed by a melt extrusion method.
When the optical density of the obtained black resin sheet (dark color layer 12) was measured by an apparatus specified in ISO 5/4, Dρ was 1.65. The black resin sheet was visually recognized as black.

(2. Formation of glittering material-containing layer)
A stripe pattern shown in FIG. 2(B) was formed on the obtained black resin sheet (dark color layer 12) by a gravure printing method using a high-intensity silver ink (Decomet, manufactured by Toyo Aluminum Co., Ltd.). Was printed at a thickness of 2 μm, a width of 5 mm, and an interval of 20 mm to form a bright material-containing layer 14 having a stripe pattern.
The area ratio of the bright material-containing layer 14 formed per unit area in a plan view was 20% with respect to the entire area of the dark color layer 12.
The bright material-containing layer 14 having a stripe pattern was formed on the black resin sheet (dark color layer 12). The bright material-containing layer 14 was visually recognized as silver.

(3. Formation of transparent colored layer)
Apply a gravure ink with a blue hue (Toyo Ink Co., Ltd., non-torque ink for VKNT semi-hard PVC film) on the surface of the black resin sheet (dark color layer 12) on which the stripe pattern bright material-containing layer is formed. Then, the transparent colored layer 16 having a thickness of 4 μm was formed. The gravure ink was applied using a gravure printing device.
As shown in FIG. 2C, a transparent colored layer 16 that is a gravure ink layer having a blue hue is formed on the surface of the glittering material-containing layer having a stripe pattern of silver color, thereby forming a stripe formed of silver ink. The bright material-containing layer of the pattern was visually recognized as a high-intensity blue stripe pattern, and a design of brightness expression such as neon was obtained.

(4. Formation of surface layer)
A polymethylmethacrylate (PMMA) resin, which is an acrylic resin, was applied on the surface on which the transparent colored layer was formed by a calendar method to form a surface layer having a thickness of 150 μm. The coating was performed using the same device used for forming the transparent colored layer. It was confirmed that the surface layer was a transparent resin layer, and the appearance of the design of the brightness expression such as the high brightness blue stripe pattern neon formed in the previous step was maintained.

[Example 2]
Instead of the gravure ink having a blue hue used in Example 1, a gravure ink having a red hue (Toyo Ink Co., Ltd., non-torque ink for VKNT semi-hard PVC film) was applied to the entire surface to give a thickness of 4 μm. The transparent colored layer 16 was formed.
By forming a gravure ink layer having a red hue on the silver stripe surface, the glitter material-containing layer of the stripe pattern formed by the silver ink is visually recognized as a high-intensity red stripe pattern, and visually. A design having a brightness expression different from that of Example 1 was obtained.

From the results of Example 1 and Example 2, it can be seen that the skin material of the present embodiment is a skin material that can be easily manufactured using a general-purpose device and has a design having a neon-tone brightness expression. ..

10 Skin material 12 Dark color layer with reflection density of 1.55 or more (dark color layer)
14 Luminous Material-Containing Layer 16 Transparent Colored Layer Having Visible Light Transmission (Transparent Colored Layer)
18 surface layer

Claims (8)

A dark layer that includes a resin and a colorant, has a reflection density (Dρ) of 1.55 or more, and has a film thickness in the range of 60 μm to 2 mm, and is provided on at least a part of the dark layer. a luster pigment-containing layer comprising a resin, and is provided in the glittering material-containing layer comprises a pigment and a resin other than the bright material, possess transparent colored layer having visible light permeability, and,
A skin material , in which the pigments other than the luster color material are pigments having an average particle diameter of 0.7 μm or less . The skin material according to claim 1, wherein the dark color layer is provided on a base material or a temporary support. The skin material according to claim 1, wherein the dark color layer is a black resin layer containing at least one colorant selected from the group consisting of black pigments and black dyes. The skin material according to any one of claims 1 to 3, wherein the luster material-containing layer is provided in an area of 5% to 80% with respect to a total area of the dark color layer in plan view. The skin material according to any one of claims 1 to 4, wherein the glittering material contains at least one selected from the group consisting of a metal pigment and a pearl pigment. Forming a dark color layer having a reflection density of 1.55 or more and a film thickness in the range of 60 μm to 2 mm using the first resin composition containing a resin and a colorant,
A step of applying a second resin composition containing a resin and a glittering material to at least a part of the formed dark color layer by a printing method to form a glittering material-containing layer,
And a transparent coloring having visible light transparency by providing a third resin composition containing a resin and a pigment other than the brightening material on the dark color layer having the formed brightening material-containing layer in at least a part thereof. forming a layer, only including,
The method for producing a skin material, wherein the pigment other than the luster color material is a pigment having an average particle diameter of 0.7 μm or less . The method for manufacturing a skin material according to claim 6, wherein the step of forming the dark color layer includes a step of forming a film of a first resin composition containing a resin and a colorant. The method for producing a skin material according to claim 6, wherein the step of forming the dark color layer includes a step of applying a first resin composition containing a resin and a colorant onto a base material or a temporary support.