Laminated film and decorative laminated structure

Abstract

The invention provides a laminated film and a decorative laminated structure capable of achieving both concealment and visibility. The laminated film according to the present invention comprises a first film and a first layer, the first film containing an inorganic pigment and an organic pigment, and may be arranged in the order of an appearance design layer, the first layer, and the first film, or may be arranged in the order of the first layer, the appearance design layer, and the first film, the first layer being an appearance design layer, and the second layer being an appearance design layer. The design layer may be in contact with the first film.

Description

Technical Field

[0001] The present disclosure relates to a laminate film and a decorative laminate structure. Background Art

[0002] Previously, research has been underway to develop films or sheets that offer excellent concealment while allowing text and other information displayed on a display or the like located on the back side to be visible. For example, Patent Document 1 discloses a leather-like sheet having a colored resin layer disposed so as to cover a light-emitting component. The leather-like sheet has a first principal surface, with the surface facing the light-emitting component being the first principal surface, and the opposite surface being the second principal surface. The sheet exhibits a total light transmittance of 3% to 10% as viewed from the second principal surface, a haze of 99% or less, and no fiber base material when viewed through the thickness.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-083107 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In recent years, there has been a demand for a film that, when attached to the surface of a substrate containing a light source, such as a display, prevents the light projector from being discernible when the light source is off, while allowing the text or pattern displayed on the light projector to be visible when the light source is on. Clear visibility is desired even for complex and colorful patterns or text displayed on displays, and films laminated to substrates containing light sources, in particular, require both concealment and excellent visibility.

[0008] The present invention has been made in view of the above-mentioned current situation, and an object of the present invention is to provide a laminate film and a decorative laminate structure that can achieve both concealment and visibility.

[0009] Technical means to solve the problem

[0010] (1) One embodiment of the present invention is a laminated film characterized by comprising: a first film and a first layer,

[0011] The first film contains an inorganic pigment and an organic pigment.

[0012] (2) In addition, a laminated film according to one embodiment of the present invention is based on the structure of (1) above, wherein the design layer, the first layer, and the first film are arranged in this order.

[0013] (3) In addition, a laminated film according to one embodiment of the present invention is based on the structure of (1) above, wherein the first layer, the design layer, and the first film are arranged in this order.

[0014] (4) In addition, a laminated film according to one embodiment of the present invention is based on the structure of (1) above, wherein the first layer is a design layer, and the design layer is in contact with the first film.

[0015] (5) In addition, a laminated film according to one embodiment of the present invention is based on the structure according to any one of (1) to (4), wherein the inorganic pigment contains carbon black.

[0016] (6) In addition, a laminated film according to one embodiment of the present invention is based on the structure of any one of (1) to (5), wherein the organic pigment includes at least one organic pigment selected from quinacridone pigments, phthalocyanine blue, and azo pigments.

[0017] (7) In addition, a laminated film according to one embodiment of the present invention is based on the structure according to any one of (1) to (6), wherein the organic pigment contains a metal complex.

[0018] (8) In addition, a laminated film according to one embodiment of the present invention is based on the structure described in any one of (2) to (7), wherein the design layer contains a pearlescent pigment.

[0019] (9) In addition, a laminated film according to one embodiment of the present invention is based on the structure according to any one of (1) to (8), wherein the first film is a polyvinyl chloride film.

[0020] (10) In addition, a laminated film according to one embodiment of the present invention is based on the structure of (1), (2), (3), (5), (6), (7) or (8), wherein the first film and the first layer are polyvinyl chloride films.

[0021] (11) In addition, a laminated film according to one embodiment of the present invention is based on the structure of any one of (1) to (10), wherein the first film further includes an adhesive layer on the surface opposite to the surface on which the first layer is arranged.

[0022] (12) In addition, a laminated film according to one embodiment of the present invention is based on the structure of (11) above, wherein the adhesive layer contains an acrylic adhesive.

[0023] (13) Another embodiment of the present invention is a decorative laminate structure comprising the laminate film according to (11) or (12) above, and a substrate laminated via the adhesive layer.

[0024] Effects of the Invention

[0025] The laminate film and decorative laminate structure of the present invention can achieve both concealment and visibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] [ Figure 1 ] is a schematic cross-sectional view of a laminated film according to an exemplary embodiment, that is, a laminated film having a first film and a second film.

[0027] [ Figure 2 ] is a schematic cross-sectional view of a laminated film according to an exemplary embodiment, that is, a laminated film having a first film and a design layer.

[0028] [ Figure 3 ] is a cross-sectional schematic diagram illustrating a laminated film according to an exemplary embodiment, that is, a laminated film in the order of a design layer, a second film, and a first film.

[0029] [ Figure 4 ] is a cross-sectional schematic diagram illustrating a laminated film according to an exemplary embodiment, that is, a laminated film in the order of a second film, a design layer, and a first film.

[0030] [ Figure 5 ] is an example Figure 3 Schematic cross-sectional view of a laminated film in which the laminated film further includes an adhesive layer.

[0031] [ Figure 6 ] is an example Figure 4 Schematic cross-sectional view of a laminated film in which the laminated film further includes an adhesive layer.

[0032] [ Figure 7 ] is included Figure 5 Schematic cross-sectional view of a decorative laminate structure of a laminate film.

[0033] [ Figure 8 ] is included Figure 6 Schematic cross-sectional view of a decorative laminate structure of a laminate film.

[0034] [ Figure 9 ] are photographs of the laminated film of Example 1 when the light source is off and when it is on.

[0035] [ Figure 10 ] are photographs of the laminated film of Example 2 when the light source is off and when it is on.

[0036] [ Figure 11 ] are photographs of the laminated film of Example 3 when the light source is off and when it is on.

[0037] [ Figure 12 ] are photographs of the laminated film of Example 4 when the light source is off and when it is on.

[0038] [ Figure 13] are photographs of the laminated film of Example 5 when the light source is off and when it is on.

[0039] [ Figure 14 ] are photographs of the laminated film of Example 6 when the light source is off and when it is on.

[0040] [ Figure 15 ] are photographs of the laminated film of Example 7 when the light source is off and when it is on.

[0041] [ Figure 16 ] are photographs of the laminated film of Comparative Example 1 when the light source is off and when it is on.

[0042] [ Figure 17 ] are photographs of the laminated film of Comparative Example 2 when the light source is off and when it is on.

[0043] [ Figure 18 ] are photographs of the laminated film of Comparative Example 3 when the light source is off and when it is on.

[0044] [ Figure 19 ] are photographs of the laminated film of Comparative Example 4 when the light source is off and when it is on.

[0045] [ Figure 20 ] are photographs of the laminated film of Comparative Example 5 when the light source is off and when it is on.

[0046] [ Figure 21 ] are photographs of the laminated film of Comparative Example 6 when the light source is off and when it is on. DETAILED DESCRIPTION

[0047] The laminated film of the embodiment includes a first film and a first layer. The first film contains an inorganic pigment and an organic pigment. The first film is a resin film containing a resin component and is processed into a sheet. The first layer can be a resin film, a design layer, a coating layer of a resin composition, or the like.

[0048] The first film is a film containing inorganic pigments and organic pigments, and is a semi-permeable film. Since the first film contains both inorganic pigments and organic pigments, both concealment and excellent visibility can be taken into account. The so-called concealment refers to the case where the substrate is configured on the back side (first film side) of the laminated film, the outer edge of the substrate cannot be visually recognized. The so-called visibility refers to the case where a projection device including a light source such as a display is configured on the back side (first film side) of the laminated film, the text or pattern displayed on the display can be visually recognized, and preferably the outer edge of the displayed text or pattern can be clearly visually recognized.

[0049] Using only inorganic pigments can improve concealment, but it is difficult to ensure visibility, so it is impossible to achieve both concealment and visibility. On the other hand, using only organic pigments can easily ensure visibility, but it is difficult to ensure concealment, so it is impossible to achieve both concealment and visibility.

[0050] Examples of the inorganic pigment include compounds containing carbon, titanium, zinc, iron, chromium, lead, molybdenum, cadmium, bismuth, cobalt, aluminum, copper, gold, silver, barium, silicon dioxide, kaolin, talc, antimony, nickel, or alloys thereof. More specifically, examples include carbon black, titanium oxide, zinc flower (zinc oxide), iron oxide, chromium oxide, chrome yellow (lead chromate), molybdenum red, cadmium yellow, cadmium red, bismuth vanadate, cobalt blue, cobalt green, titanium yellow, aluminum powder, brass powder, gold colloid, silver colloid, barium sulfate, silicon dioxide, kaolin clay, talc, aluminum hydroxide, zinc sulfide, antimony oxide, and the like. Among them, in terms of high concealing effect, it is preferred that the inorganic pigment include carbon black. These can be used alone or in combination of two or more.

[0051] The content of the inorganic pigment is preferably 0.01 to 1 part by mass, more preferably 0.04 to 0.5 parts by mass, and even more preferably 0.05 to 0.2 parts by mass, relative to 100 parts by mass of the resin component.

[0052] Examples of the organic pigments include condensed polycyclic pigments and azo pigments. Among the condensed polycyclic pigments, at least one of quinacridone pigments, anthraquinone pigments, indigo pigments, perindole pigments, perylene pigments, phthalone pigments, dioxazine pigments, isoindolinone pigments, diketopyrrolopyrrole pigments, and phthalocyanine pigments is preferred. Specific examples of the quinacridone pigments include unsubstituted quinacridone, quinacridone red, quinacridone magenta, quinacridone crimson, and quinacridone maroon. Among the azo pigments, at least one of β-naphthol pigments, β-hydroxynaphthoic acid pigments, naphthol AS pigments, acetoacetic acid arylate pigments, naphthalenesulfonic acid pigments, and pyrazolone pigments is preferred. These pigments may be used alone or in combination of two or more.

[0053] The organic pigment may include at least one organic pigment selected from quinacridone pigments, phthalocyanine blue, and azo pigments.

[0054] From the perspective of weather resistance, the organic pigment preferably contains a metal complex. A metal complex is a complex of a metal ion and an organic compound (ligand) bonded to the metal ion. The inclusion of a metal complex in the organic pigment can reduce discoloration during outdoor use.

[0055] Examples of the organic pigment containing the metal complex include phthalocyanine blue, phthalocyanine green, nickel azo yellow, copper azomethylene yellow, nickel complex orange, and nickel azomethylene red, in which copper ions are bonded to a phthalocyanine compound.

[0056] The content of the organic pigment is preferably 0.01 to 2 parts by mass, more preferably 0.05 to 0.5 parts by mass, and even more preferably 0.1 to 0.5 parts by mass, relative to 100 parts by mass of the resin component.

[0057] The mixing ratio of the inorganic pigment to the organic pigment is preferably 1:0.2 to 1:5, more preferably 1:0.5 to 1:2, and even more preferably 1:1.1 to 1:1.9.

[0058] The first film can use a non-polar resin such as polyethylene or polypropylene, or a polar resin such as polyurethane, polyvinyl chloride, etc., preferably a polyvinyl chloride film containing vinyl chloride resin in the resin component. When the laminated film is attached to the substrate, the polyvinyl chloride film has good elongation and therefore follows the surface shape of the substrate and is not easy to break. In addition, when attached to the substrate for laminated integration molding, it can be formed at a relatively low temperature (about 120°C). In the polyvinyl chloride film, the content of vinyl chloride resin in the overall resin component of the film is preferably 50% by mass or more, more preferably 90% by mass or more.

[0059] Examples of the vinyl chloride resin include homopolymers of vinyl chloride and copolymers of vinyl chloride and other monomers.

[0060] Examples of the other monomers include vinyl esters such as vinyl acetate and vinyl propionate; olefins such as ethylene, propylene, and styrene; (meth)acrylates such as methyl acrylate, ethyl acrylate, and methyl methacrylate; maleic acid diesters such as dibutyl maleate and diethyl maleate; fumaric acid diesters such as dibutyl fumarate and diethyl fumarate; vinyl cyanides such as acrylonitrile and methacrylonitrile; vinyl halides such as vinylidene chloride and vinyl bromide; and vinyl ethers such as methyl vinyl ether and ethyl vinyl ether. These monomers may be used alone or in combination of two or more.

[0061] The content of the other monomers in the copolymer is generally 50% by mass or less, preferably 10% by mass or less. If the content exceeds 50% by mass, the bending resistance of the film may be reduced. Among the vinyl chloride resins, homopolymers of vinyl chloride are preferred for their dimensional stability.

[0062] The average degree of polymerization of the vinyl chloride resin can be, for example, 750 to 1300. When the average degree of polymerization is within the range of 750 to 1300, the formability at a relatively low temperature is good. In contrast, when the average degree of polymerization is less than 750, when the laminated film of the present embodiment is laminated and integrated with the substrate, the film may not be fully stretched and may not follow the shape of the substrate. On the other hand, when the average degree of polymerization exceeds 1300, the processability in the calendering molding for obtaining the polyvinyl chloride film is reduced, and the appearance of the film surface may deteriorate. In addition, the shrinkage rate of the film after molding becomes larger, and it may be difficult to maintain the shape. The average degree of polymerization is more preferably 1000 to 1300. The average degree of polymerization of the vinyl chloride resin refers to the average degree of polymerization measured according to Japanese Industrial Standards (JIS) K6721 "Test Methods for Vinyl Chloride Resins".

[0063] The polyvinyl chloride film preferably contains a plasticizer. The content of the plasticizer is preferably 7 parts by mass or more and 35 parts by mass or less relative to 100 parts by mass of the vinyl chloride resin. By making the content of the plasticizer within the range, flexibility or formability suitable for calendering forming, etc. is obtained. In addition, an elongation suitable for attaching the laminated film of this embodiment to a substrate for vacuum or compressed air forming, etc. is obtained. If the content of the plasticizer is less than 7 parts by mass, the polyvinyl chloride film becomes too hard and the film may break during forming. On the other hand, if it exceeds 35 parts by mass, the polyvinyl chloride film sometimes becomes too soft and its handleability is reduced. The content of the plasticizer is more preferably 15 parts by mass or more and 30 parts by mass or less relative to 100 parts by mass of the vinyl chloride resin.

[0064] Examples of the plasticizer include phthalic acid diesters such as bis(2-ethylhexyl) phthalate (dioctyl phthalate (DOP)), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), and diundecyl phthalate (DUP); aliphatic dibasic acid diesters such as dioctyl adipate and dioctyl sebacate; phosphate triesters such as tricresyl phosphate and trioctyl phosphate; epoxy plasticizers such as epoxidized soybean oil and epoxy resin; and high molecular weight polyester plasticizers. Among these, phthalic acid diesters are preferred. DUP is preferred because it is not subject to various environmental restrictions and produces less odor and less contamination of the molding machine during film formation.

[0065] The first film may contain additives such as stabilizers, ultraviolet absorbers, processing aids, and modifiers as needed.

[0066] The thickness of the first film is preferably 50 μm or more and 300 μm or less. If the thickness of the first film is less than 50 μm, the concealment is sometimes reduced. On the other hand, if the thickness of the first film exceeds 300 μm, when the first film is thermally laminated with other layers such as the second film described later, sometimes the heat is insufficient or the processing speed is reduced. In addition, since the thickness of the entire laminated film is increased, the processability of the laminated film when integrated with the substrate is sometimes reduced. The thickness of the first film is more preferably 70 μm or more and 200 μm or less, and more preferably 150 μm or less.

[0067] The first layer is preferably disposed on the front surface side of the first film. In addition, the first layer is preferably a layer that imparts color or design to the laminated film. In this specification, the so-called front surface side refers to the side closer to the observer when the laminated film is in use, also referred to as the observer side. The so-called back side refers to the side opposite to the front surface side.

[0068] The first layer may be a resin film. In the case where the first layer is a resin film, it is also referred to as a second film hereinafter. Figure 1 : is a schematic cross-sectional view of a laminated film according to an exemplary embodiment, that is, a laminated film having a first film and a second film. Figure 1 As shown, the laminated film 10A of the embodiment may be formed by laminating the second film 2 and the first film 1 in this order from the front surface side.

[0069] The second film is preferably a resin film containing a resin component. The second film may be transparent or a colored film containing a colorant such as a pigment. The total light transmittance of the second film is preferably 80% or greater. In this specification, the total light transmittance is a value measured using a method in accordance with JIS K 7361.

[0070] The second film may also be a polyvinyl chloride film. In particular, when the first film is a polyvinyl chloride film, the second film is also preferably a polyvinyl chloride film. The polyvinyl chloride film may be made of the materials listed for the first film. The first and second films may be laminated by heat lamination, wherein the films are heated and pressure-bonded. The first and second films are preferably in contact.

[0071] From the viewpoint of suppressing separation from the first film or suppressing warping, the second film is preferably equal to the first film in terms of the plasticizer content or film thickness.

[0072] The plasticizer may be any of those listed for the first film. The content of the plasticizer is preferably 7 parts by mass to 35 parts by mass, more preferably 15 parts by mass to 30 parts by mass, relative to 100 parts by mass of the vinyl chloride resin.

[0073] The thickness of the second film is preferably 50 μm or more and 300 μm or less, more preferably 70 μm or more and 200 μm or less, and even more preferably 150 μm or less.

[0074] The first layer may also be a design layer. Figure 2 : is a cross-sectional schematic diagram illustrating a laminated film according to an embodiment, that is, a laminated film having a first film and a design layer. Figure 2 As shown, the laminated film 10B of the embodiment may be laminated with the design layer 3 and the first film 1 in this order from the front surface side.

[0075] The design layer is a layer that imparts a design such as color or pattern to the laminate film, and is obtained by printing with ink, etc. Patterns such as wood grain and geometric patterns, and characters, etc. can be formed on the design layer.

[0076] The ink may contain a colorant, a binder resin, a solvent, and the like. Examples of the colorant include pigments, dyes, and inorganic fillers such as titanium oxide. Examples of the binder resin include vinyl acetate, acrylic resins, and acrylic urethane resins. Furthermore, the pigment may be an inorganic pigment, an organic pigment, or a combination of inorganic and organic pigments.

[0077] The design layer preferably further includes a pearlescent pigment. The pearlescent pigment is a pigment that can reflect a portion of the incident light, imparting a pearlescent luster. The pearlescent pigment may be a single crystal of a metal, or a pearlescent pigment in which a base material is coated with a metal oxide (metal oxide coated type). Examples of single crystal pearlescent pigments include basic lead carbonate and bismuth oxychloride. Examples of metal oxide coated pearlescent pigments include: pearlescent pigments in which a base material such as mica, aluminum oxide flakes, silicon dioxide flakes, or glass flakes is coated with a metal oxide such as titanium oxide or iron oxide. More specifically, examples include titanium dioxide coated mica and iron oxide coated mica. These may be used alone or in combination of two or more.

[0078] The thickness of the design layer is, for example, 1 μm to 10 μm. The unit area weight of the ink is, for example, 0.5 g / m 2 Above and 12g / m 2 the following.

[0079] The printing method is not particularly limited, and gravure printing, offset printing, flexographic printing, screen printing, and the like may be used. However, gravure printing is preferred from the viewpoint of good printability on resin films such as polyvinyl chloride films.

[0080] Figure 3 It is a schematic cross-sectional view illustrating a laminated film according to an embodiment, that is, a design layer, a second film, and a first film laminated in this order. Figure 4It is a cross-sectional schematic diagram illustrating a laminated film according to an embodiment, that is, a second film, a design layer, and a first film laminated in this order. Figure 1 The laminated film 10A shown may further include a design layer. Figure 3 As shown, the laminated film 10C may be configured with the design layer 3, the second film 2, and the first film 1 in this order from the front surface side. Figure 4 As shown, a laminated film 10D may be formed in which the second film 2, the design layer 3, and the first film 1 are sequentially arranged from the front surface side. Figure 2 The laminated film 10B shown may further include a second film, which may also have the Figure 4 The structure shown.

[0081] The laminated film 10C is obtained, for example, by forming a design layer on one of the surfaces of the second film, laminating a first film on the surface of the second film opposite to the surface on which the design layer is formed (the surface on which the design layer is not formed), and performing heat lamination. The laminated film 10D is obtained, for example, by forming a design layer on one of the surfaces of the second film, laminating the first film and the second film in a manner that the design layer and the first film are opposite to each other, and performing heat lamination. The design layer may also be formed on the first film, for example, the laminated film 10C is obtained by forming a design layer on one of the surfaces of the first film, laminating the second film on the surface of the first film opposite to the surface on which the design layer is formed (the surface on which the design layer is not formed), and performing heat lamination. The laminated film 10D is obtained, for example, by forming a design layer on one of the surfaces of the first film, laminating the first film and the second film in a manner that the design layer and the second film are opposite to each other, and performing heat lamination. In the laminated films 10C and 10D, the second film is preferably in contact with the design layer, and the design layer is preferably in contact with the first film.

[0082] The laminated film of the embodiment may further include an adhesive layer on the surface of the first film opposite to the surface on which the first layer is arranged. Figure 5 This is an example Figure 3 Schematic cross-sectional view of a laminated film in which the laminated film further includes an adhesive layer. Figure 6 This is an example Figure 4 A schematic cross-sectional view of a laminated film in which the laminated film further comprises an adhesive layer. Figure 5 In the embodiment, a laminated film 10E is shown in which the surface of the first film 1 opposite to the surface on which the second film 2 is disposed includes an adhesive layer 4. Figure 6 In the embodiment, a laminated film 10F is shown in which the surface of the first film 1 opposite to the surface on which the design layer 3 is disposed includes the adhesive layer 4. However, Figure 1 The laminated film 10A shown includes an adhesive layer 4 on the side opposite to the side on which the second film 2 is disposed. Figure 2The first film 1 of the laminated film 10B shown includes an adhesive layer 4 on the surface opposite to the surface on which the design layer 3 is arranged.

[0083] The adhesive layer is not particularly limited, and may include an acrylic adhesive, a rubber adhesive, a silicone adhesive, or the like. Of these, acrylic adhesives are preferred due to their excellent adhesion, workability, heat aging resistance, humidity aging resistance, formability, and weather resistance, as well as their relative low cost.

[0084] The acrylic adhesive is an adhesive containing an acrylic polymer. The adhesive layer 4 may contain a known crosslinking agent such as an isocyanate hardener or an epoxy hardener.

[0085] The thickness of the adhesive layer is preferably 20 μm to 70 μm, more preferably 30 μm to 55 μm. The adhesive layer preferably does not reduce transparency, and in this regard, the thickness of the adhesive layer is preferably within the above range.

[0086] The first film may be in contact with the adhesive layer. Furthermore, although not shown, a primer layer may be provided between the first film and the adhesive layer. Providing a primer layer can improve the adhesion between the first film and the adhesive layer. Furthermore, when the design layer is formed using ink, contact with the primer layer may cause ink penetration. Therefore, a structure in which the primer layer and the design layer are not in contact is preferred.

[0087] The laminated film of the embodiment may optionally be subjected to surface processing such as embossing on the outermost surface. By imparting an embossed shape (concave and convex shape), the laminated film can be given a desired texture. Embossing can also impart a fabric-like pattern (light and dark alternating pattern) such as texture, wood grain, leather grain, plain weave, or twill.

[0088] The total thickness of the laminated film of the embodiment excluding the thickness of the adhesive layer is preferably 100 μm to 600 μm, more preferably 150 μm to 400 μm, and still more preferably 180 μm to 350 μm.

[0089] The total light transmittance of the laminated film of the embodiment is preferably 50% or less, more preferably 30% or less. The lower limit of the total light transmittance is, for example, 1%. In this specification, the total light transmittance is a value measured according to the method of JIS K 7361. The total light transmittance can be measured, for example, using a "HazeMater NDH5000" manufactured by Nippon Denshoku Industries Co., Ltd.

[0090] The decorative laminated structure 100 can be obtained by laminating and integrating the laminated film of this embodiment with a base material. Figure 7 is included Figure 5 Schematic cross-sectional view of a decorative laminate structure of a laminate film. Figure 8 is included Figure 6 A schematic cross-sectional view of a decorative laminate structure of a laminated film. Figure 7 In the example, the laminated film 10E and the substrate 20 are laminated via the adhesive layer 4. Figure 8 In the example, the laminated film 10F and the substrate 20 are laminated via the adhesive layer 4. Figure 1 The laminated film 10A shown in the figure may have an adhesive layer 4 formed on the side opposite to the side on which the second film 2 is disposed and may be laminated on the substrate 20. Figure 2 In the laminated film 10B shown, the adhesive layer 4 is formed on the surface of the first film 1 opposite to the surface on which the design layer 3 is arranged, and the film is laminated on the base material 20 .

[0091] The decorative laminate structure of the present embodiment is obtained, for example, by attaching and integrating the laminated film to the substrate via the adhesive layer of the laminated film. As a method of attaching the laminated film to the substrate, for example, a method of attaching the laminated film to the substrate by heating the laminated film can be cited. For example, thermoforming, vacuum forming, pressure forming, vacuum-pressure forming, wrapping, etc. can be cited. As a specific example of vacuum forming, a method of attaching the laminated film to the substrate using a TOM forming machine (manufactured by Bushi Vacuum Co., Ltd., model: NGF-0406) as a vacuum-pressure forming machine at a heating temperature of 80°C to 140°C by the heater can be cited. As a specific example of wrapping, a method of attaching the laminated film along the substrate while warming the laminated film in a dryer to soften it can be cited.

[0092] The laminated film of the present embodiment has excellent concealing properties and can suppress transparent visibility of the substrate. Therefore, it can be used for concealing the substrate or for decorative purposes to impart a design to the surface of the substrate.

[0093] The base material used in the decorative laminate structure of the present embodiment is not particularly limited, and examples thereof include interior components of vehicles such as automobiles; home appliances such as air conditioners; and mobile devices such as smartphones and tablet computers.

[0094] The material constituting the substrate is not particularly limited, and examples thereof include resins such as polycarbonate resins, acrylic resins, styrene resins, acrylonitrile-butadiene-styrene (ABS) resins, and polypropylene (PP) resins; metals such as iron, copper, and aluminum; alloys; and wood such as medium density fiber (MDF) boards.

[0095] In addition to its excellent concealment, the laminated film of this embodiment also has excellent visibility, and therefore is preferably used as a light-transmitting film that allows a portion of light to pass through. When the laminated film of this embodiment is used as a light-transmitting film, it is preferred to use a lighting fixture or a light projection device such as a display that includes a light source that emits light toward the observer as the substrate. When the light projection device is arranged on the back side of the laminated film, when the light source is off, the light projection device can be concealed by the laminated film, making it difficult for the observer to visually recognize the existence of the light projection device, and the observer can visually recognize the pattern or color of the first layer of the laminated film. On the other hand, when the light source is on, the observer can visually recognize the display image displayed by the light projection device such as a display.

[0096] Example

[0097] Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0098] The film materials used in Examples and Comparative Examples are shown in Table 1 below, and the inorganic pigments and organic pigments used in Examples and Comparative Examples are shown in Table 2 below. Masterbatches containing pigments, polyvinyl chloride (PVC), plasticizers, and the like were used for the inorganic and organic pigments.

[0099] [Table 1]

[0100]

[0101] [Table 2]

[0102]

[0103] <Film production>

[0104] The materials shown in Tables 1 and 2 were mixed according to the formulations shown in Tables 3 and 4 below, melt-kneaded using a Banbury mixer, and then sheet-shaped PVC films A to L were produced using an inverted L-shaped calender. The content of each component in Tables 3 and 4 is the content relative to 100 parts by mass of vinyl chloride resin. In addition, the content of organic pigments and inorganic pigments is the content of the masterbatch. The total amount of organic pigments and inorganic pigments contained in the masterbatch was calculated based on Tables 2 to 4, and the content relative to 100 parts by mass of vinyl chloride resin was recorded in Tables 3 and 4. In addition, the total light transmittance of PVC film A was 90%.

[0105]

[0106]

[0107] <Production of laminated films>

[0108] (Example 1)

[0109] In Example 1, PVC film B (thickness 90 μm) shown in Table 3 was used as the first film, and PVC film A (thickness 90 μm) shown in Table 3 was used as the second film. PVC film B and PVC film A were stacked and thermally laminated. A polyethylene terephthalate (PET) sheet was used as a separator, and an acrylic adhesive ("ARONTAC" (registered trademark) MPT-29 manufactured by Toagosei Co., Ltd.) was applied to the separator to form an adhesive layer having a thickness of 35 μm after drying. Then, the adhesive layer was attached to the surface of PVC film B opposite to the surface in contact with PVC film A, to produce the laminated film of Example 1 in which PVC film A, PVC film B, and the adhesive layer were stacked in this order.

[0110] (Example 2)

[0111] In Example 2, as in Example 1, PVC film B (90 μm thick) was used as the first film, and PVC film A (90 μm thick) was used as the second film. On one side of PVC film A, a wood grain print A with a straight wood grain pattern was printed by gravure printing using an ink containing a pearlescent pigment as the design layer. The ink used an acrylic urethane resin as a binder resin, and the content of the pearlescent pigment relative to the solid content of the ink (acrylic urethane resin) was 20% by mass. The unit weight of the ink was 10 g / m 2 After printing, the laminate was dried at 60° C. for 1 minute. The total light transmittance of the laminate of the PVC film A and the design layer was 81%.

[0112] PVC film B was laminated and heat-laminated on PVC film A, with the surface of PVC film A opposite to the surface printed with the design layer facing PVC film B. Subsequently, an acrylic adhesive layer (35 μm thick) was applied to the surface of PVC film B opposite to the surface in contact with PVC film A, in the same manner as in Example 1. This produced the laminated film of Example 2, which was laminated in this order: design layer, PVC film A, PVC film B, and adhesive layer.

[0113] (Example 3)

[0114] A wood grain print B with a straight wood grain pattern was printed on PVC film A as in Example 2, except that the type of pearlescent pigment was changed. In Example 3, a different pearlescent pigment was used, and the binder resin, pearlescent pigment content, and ink weight per unit area were used to form the design layer in the same manner as in Example 2. The total light transmittance of the laminate of PVC film A and the design layer was 72%. Subsequently, a laminated film of Example 3 was prepared by laminating the design layer, PVC film A, PVC film B, and adhesive layer in this order, in the same manner as in Example 2.

[0115] (Examples 4 to 7)

[0116] Laminated films of Examples 4 to 7 were prepared in the same manner as in Example 1 except that PVC films E to H (all with a thickness of 90 μm) shown in Table 3 were used as the first film. PVC film A, any one of PVC films E to PVC films H, and an adhesive layer were laminated in this order.

[0117] (Comparative Examples 1 to 6)

[0118] PVC film C, PVC film D, PVC film I to PVC film L (all with a thickness of 90 μm) shown in Table 4 were used as the first film. In addition, the laminated films of Comparative Examples 1 to 6 were prepared in the same manner as in Example 1, in which the adhesive layers were laminated in the order of PVC film A, PVC film C, PVC film D, PVC film I to PVC film L.

[0119] <Evaluation Test>

[0120] The laminated films of Examples and Comparative Examples were evaluated for (1) concealment and (2) visibility using the following methods. Furthermore, (3) total light transmittance of each laminated film was measured. The results are shown in Tables 5 and 6 below. Figures 9 to 21 These are photographs of the laminated films of Examples 1 to 7 and Comparative Examples 1 to 6 when the light source is off and when the light source is on, respectively.

[0121] (1) Evaluation of concealment (when light source is off)

[0122] Indoors, on a black water platform, a smartphone (Apple (iPhone) (registered trademark) 13) is configured so that the projection surface (display screen) faces the ceiling, and the light from the indoor lights is configured to illuminate the display screen of the smartphone from the normal direction. The laminated films of the embodiments and comparative examples are configured in a manner that covers the display screen of the smartphone. The laminated films of the embodiments and comparative examples are configured in a manner that the second film becomes the observer side. In addition, Example 2 and Example 3 are configured in a manner that the configuration direction of the wood grain pattern is different. When the smartphone is turned off, visual observation is made from the laminated film side, and the concealment is evaluated according to the following benchmarks.

[0123] ○: The smartphone placed on the back side of the laminated film was not recognized

[0124] △: The smartphone placed on the back side of the laminated film is slightly visible

[0125] ×: The smartphone placed on the back side of the laminated film is clearly visible

[0126] (2) Evaluation of visibility (when the light source is on)

[0127] The smartphone used in the evaluation of the concealment (1) was made to display the logo of Bando Chemical Co., Ltd., and visually observed from the laminated film side under the same environment as the evaluation of the concealment (1), and the visibility (visibility) of the logo was evaluated according to the following criteria. The brightness was set to 80% of the maximum brightness of the smartphone. In addition, the logo of Bando Chemical Co., Ltd. was depicted with the word "BANDO" in black on a white background, with a red straight line depicted above the text and a black straight line depicted below.

[0128] ○: The logo can be clearly seen

[0129] △: The logo looks blurry

[0130] ×: The logo cannot be seen

[0131] (3) Total light transmittance of the laminated film

[0132] The total light transmittance of the laminated films of the Examples and Comparative Examples was measured at three arbitrary points, and the average of the measured values ​​at the three points is reported in Tables 5 and 6 below. The total light transmittance was measured according to JIS K 7361. A "Haze Mater NDH5000" manufactured by Nippon Denshoku Industries Co., Ltd. was used as the measuring apparatus.

[0133]

[0134]

[0135] like Figures 9 to 15 As shown in Examples 1 to 7 in which both inorganic and organic pigments are used in the first film, the smartphone cannot be seen when the light source is off. Figure 9 、 Figures 12 to 15 As shown, in Examples 1, 4 to 7, the displayed image (logo) can be clearly recognized. Figure 10 and Figure 11As shown, even in Examples 2 and 3 having a design layer, the logo can be visually recognized although it is blurry.

[0136] like Figure 16 、 Figure 18 As shown, in Comparative Examples 1 and 3, where only organic pigments were added, the displayed image (logo) can be clearly seen when the light source is on, and the visibility is good, but when the light source is off, the outer edge of the smartphone can be clearly seen, and concealment cannot be achieved. Figure 17 As shown, in Comparative Example 2, which only added titanium oxide as an inorganic pigment, when the light source was off, although it was not as clear as in Comparative Example 1, the outer edge of the smartphone was visible, and the concealment was insufficient. The visibility when the light source was on was lower than in Comparative Example 1. Figures 19 to 21 As shown, Comparative Examples 4 to 6, in which only carbon black was added as an inorganic pigment, had good concealment when the light source was off. However, even when the carbon black content was changed, the marking could not be seen when the light source was on, indicating low visibility. This confirms that concealment is insufficient when using only organic pigments, while visibility is difficult to adjust when using only inorganic pigments. The combined use of inorganic and organic pigments can achieve both excellent concealment and visibility.

[0137] In terms of preventing the substrate (smartphone) in an extinguished state arranged on the back side from being visible, the substrate to which the laminated film of this embodiment is attached is not limited to a substrate that emits light. Light-impermeable components such as metal components or wood, or transparent components such as resin substrates that do not have a light source can also be used. The laminated film of this embodiment can also be preferably used as a decorative film that can conceal the texture of these substrates.

[0138] Explanation of Figure Numbers

[0139] 1: First film

[0140] 2: Second film

[0141] 3: Appearance design layer

[0142] 4: Adhesive layer

[0143] 10A, 10B, 10C, 10D, 10E, 10F: Laminated film

[0144] 20: Base material

[0145] 100: Decorative laminated structure

Claims

1. A laminated film, characterized in that include: The first film and the first layer, The first film contains an inorganic pigment and an organic pigment.

2. The laminated film according to claim 1, wherein The design layer, the first layer, and the first film are arranged in this order.

3. The laminated film according to claim 1, wherein The first layer, the design layer, and the first film are arranged in this order.

4. The laminated film according to claim 1, wherein The first layer is the appearance design layer, The design layer is in contact with the first film.

5. The laminated film according to any one of claims 1 to 4, characterized in that The inorganic pigment includes carbon black.

6. The laminated film according to any one of claims 1 to 5, characterized in that The organic pigment includes at least one organic pigment selected from quinacridone pigments, phthalocyanine blue and azo pigments.

7. The laminated film according to any one of claims 1 to 6, characterized in that The organic pigment comprises a metal complex.

8. The laminated film according to any one of claims 2 to 7, characterized in that The design layer contains pearlescent pigments.

9. The laminated film according to any one of claims 1 to 8, characterized in that The first film is a polyvinyl chloride film.

10. The laminated film according to claim 1, 2, 3, 5, 6, 7 or 8, wherein: The first film and the first layer are polyvinyl chloride films.

11. The laminated film according to any one of claims 1 to 10, characterized in that The first film further includes an adhesive layer on a surface opposite to a surface on which the first layer is arranged.

12. The laminated film according to claim 11, wherein The adhesive layer includes an acrylic adhesive.

13. A decorative laminate structure, characterized in that: The laminated film according to claim 11 or 12 and a substrate laminated thereon via the adhesive layer.

Images