Interior materials and methods for manufacturing interior materials

Abstract

This invention provides an interior material that is less prone to peeling between PVC layers, even when a colored decorative layer is formed between PVC layers using inkjet ink. [Solution] The interior material 1 of the present invention has a surface layer 2 including a colored decorative layer 23, and the surface layer 2 comprises, in this order, a first PVC layer 21 containing a vinyl chloride resin, the colored decorative layer 23 formed from inkjet ink, and a second PVC layer 22 containing a vinyl chloride resin and fine particles.

Description

Technical Field

[0004] , , , , , ,

[0003] ,

[0001] The present invention relates to an interior material provided with a colored decorative layer and a method for manufacturing the same.

Background Art

[0002] Conventionally, as interior materials for buildings such as floor materials, wall materials, and ceiling materials for buildings, interior materials provided with colored decorative layers of various designs on the surface layer containing vinyl chloride-based resins have been offered on the market. Such a colored decorative layer on the surface layer is generally formed by subjecting a resin layer containing vinyl chloride-based resin or the like to plate printing such as rotary screen printing or gravure printing. However, plate printing is suitable for mass printing of the same design, but not suitable for small lot printing, and the design formed on the interior material is a repetition of the pattern represented on the roll plate, and the repetition of the design also depends on the circumferential length of the roll plate. In this regard, according to plate-free printing such as inkjet printing, interior materials of any design can be easily manufactured, and it is also suitable for manufacturing interior materials in small lots.

[0003] Patent Document 1 discloses a floor material having a printed layer made of inkjet ink. Specifically, Patent Document 1 discloses a floor material having a layer structure of a base sheet 23 made of vinyl chloride resin / a printing film 25 made of vinyl chloride resin / an ink receiving layer 6 / a printed layer 5 made of inkjet ink / a polyurethane-based hot melt resin sheet 24 / a transparent surface sheet 22 made of vinyl chloride resin in order from the back side. The polyurethane-based hot melt resin sheet 24 functions as an adhesive layer and joins the printed layer 5 and the transparent surface sheet 22.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] However, the flooring material described in Patent Document 1 requires the preparation of a separate adhesive layer of polyurethane-based hot-melt resin between the printed layer 5 and the transparent surface sheet 22, which, combined with the complexity of the flooring material manufacturing process, increases manufacturing costs. Although it is conceivable to join the print layer 5 and the transparent surface sheet 22 by heat pressing or other means without using an adhesive layer, it is difficult to firmly bond the print layer and the resin layer even if a resin layer is laminated onto the surface of the print layer, which is made of cured inkjet ink, and then heat-pressed. [Problems that the invention aims to solve]

[0006] The object of the present invention is to provide an interior material and a method for manufacturing the same, in which the colored decorative layer and the PVC layer are less likely to peel off even when a colored decorative layer is formed between PVC layers using inkjet ink. [Means for solving the problem]

[0007] The interior material of the present invention has a surface layer including a colored decorative layer, and the surface layer comprises, in this order, a first PVC layer containing a vinyl chloride resin, the colored decorative layer formed from inkjet ink, and a second PVC layer containing a vinyl chloride resin and fine particles.

[0008] A preferred interior material of the present invention is one in which the inkjet ink comprises a colorant and a photocurable resin. A preferred interior material of the present invention contains the fine particles in an amount of 15% to 80% by weight, based on 100% by weight of the entire second PVC layer. A preferred interior material of the present invention contains calcium carbonate as fine particles with an average particle size of 0.1 μm or more and 50 μm or less.

[0009] According to another aspect of the present invention, a method for manufacturing interior materials is provided. The manufacturing method of the present invention comprises the steps of: preparing a decorative sheet having a first PVC sheet containing a vinyl chloride resin and a colored decorative layer formed on the first PVC sheet; preparing a second PVC sheet containing a vinyl chloride resin; and forming a laminate consisting of a first PVC sheet, a colored decorative layer, and a second PVC sheet by integrating the decorative sheet and the second PVC sheet under heated conditions, wherein the colored decorative layer is formed by printing inkjet ink onto the first PVC sheet using an inkjet printer, and the second PVC sheet contains fine particles. Preferably, a back layer is further formed on the laminate. [Effects of the Invention]

[0010] The interior material of the present invention forms a colored decorative layer using inkjet ink, making it easy to display a desired design. Furthermore, the colored decorative layer formed from inkjet ink has a first PVC layer and a second PVC layer containing a vinyl chloride resin on both sides, and since the second PVC layer contains fine particles, the PVC layers are less likely to peel apart. [Brief explanation of the drawing]

[0011] [Figure 1] Plan view of the interior material of the first embodiment. [Figure 2] Plan view of the interior material of the second embodiment. [Figure 3] A cross-sectional view showing the first example of the layered structure of interior materials. [Figure 4] A cross-sectional view showing a second example of the same layered structure. [Figure 5] A cross-sectional view showing a third example of the same layered structure. [Figure 6] A reference side view showing the first example of the process for forming a laminated structure when manufacturing interior materials. [Figure 7] A reference side view showing a second example of the formation process for the same laminated structure. [Modes for carrying out the invention]

[0012] The present invention will be described below with reference to the drawings as appropriate. In this specification, the "surface" of the interior material or the "surface" of any layer constituting the same refers to the side facing away from the construction surface on which the interior material is installed, and the "back surface" refers to the side on the opposite side (the side closer to the construction surface of the interior material). Plan view means viewing the interior material from a direction perpendicular to the surface of the interior material. In this specification, a numerical range expressed as "not less than a lower limit value and not more than an upper limit value" shall mean that any lower limit value and any upper limit value can be selected and "not less than any lower limit value and not more than any upper limit value" can be set. Also, it should be noted that dimensions such as thickness and size in each figure are different from the actual ones.

[0013] [Overview of Interior Material] FIG. 1 is a plan view of the interior material 1 of the first embodiment, and FIG. 2 is a plan view of the interior material 1 of the second embodiment. Referring to FIG. 1, the interior material 1 is formed in a long strip shape in plan view. The long strip shape means a substantially rectangular shape in plan view where the length in the longitudinal direction is sufficiently longer than the length in the short transverse direction. For example, the length in the longitudinal direction is 3 times or more, preferably 5 times or more, the length in the short transverse direction. Specific dimensions of the long strip shape include, for example, cases where the length in the short transverse direction is not less than 500 mm and not more than 3000 mm, and the length in the longitudinal direction is not less than 2 m and not more than 500 m. The interior material 1 formed in a long strip shape is usually wound around a roll for storage and transportation, and at the construction site, it is cut into a desired shape for use.

[0014] Referring to FIG. 2, the interior material 1 is formed in a sheet-like shape that is substantially square in plan view. However, the sheet-like interior material 1 may be formed in a substantially rectangular shape, a substantially hexagonal shape, etc. in plan view (not shown). Specific dimensions of the interior material 1 that is substantially square or substantially rectangular in plan view include, for example, cases where the vertical × horizontal = not less than 200 mm and not more than 1000 mm × not less than 200 mm and not more than 1000 mm. The sheet-like interior material 1 as shown in the illustrated example is used for storage and transportation in a state where a plurality of them are stacked, or in a state where each is wound into a roll individually.

[0015] The interior material 1 of the present invention may have flexibility or may be relatively hard without flexibility. As the degree of flexibility of the interior material 1, for example, with the back side of the interior material 1 facing the winding core, it can be wound around a winding core with a diameter of 10 cm in a roll shape. The overall thickness of the interior material 1 is not particularly limited. For example, it is 0.5 mm or more and 10 mm or less, preferably 1 mm or more and 8 mm or less, and more preferably 1.5 mm or more and 5 mm or less.

[0016] [Layer structure of interior material] The interior material 1 has a surface layer 2 including a colored decorative layer. The color of the colored decorative layer is exhibited on the surface of the interior material 1. The design of the interior material 1 is constituted by the color of the colored decorative layer. The surface of the surface layer 2 constitutes the surface of the interior material 1. Therefore, the interior material 1 of the present invention does not have pile yarn or fabric on its surface, and the surface of the interior material 1 is constituted by a PVC layer. The interior material 1 of the present invention may be constituted only by the surface layer 2, or may be constituted by the surface layer 2 and a back layer laminated on the back side thereof. The surface layer 2 has, in this order, a first PVC layer containing a vinyl chloride-based resin, a colored decorative layer formed from inkjet ink, and a second PVC layer containing a vinyl chloride-based resin and fine particles. The surface layer 2 having the first PVC layer 21, the colored decorative layer 23, and the second PVC layer 22 in this order may have the first PVC layer 21 constituting the surface of the surface layer 2, or the second PVC layer 22 may constitute the surface of the surface layer 2. The first PVC layer and the colored decorative layer are directly and firmly adhered, and the colored decorative layer and the second PVC layer are directly and firmly adhered.

[0017] Figures 3 to 5 show the first to third examples of the layer structure of the interior material 1. Figures 3 to 5 are cross-sectional views when cut at the position of the line III-III in Figures 1 and 2. The interior material 1 in Figure 3 has, in order from the surface side, a surface layer 2 and a back layer 3. The surface layer 2 has, in order from the surface side, a first PVC layer 21 containing a vinyl chloride resin, a colored decorative layer 23 formed from inkjet ink, and a second PVC layer 22 containing a vinyl chloride resin and fine particles. In this case, the first PVC layer 21 constitutes the outermost surface of the interior material 1. The back layer 3 has, in order from the surface side, a first resin layer 31, a second resin layer 32, and a third resin layer 33. The back layer 3 may have four or more resin layers. As will be described later, the first PVC layer 21 (first PVC sheet during manufacturing) has no restrictions on the formulation of fine particles, so when the first PVC layer 21 is placed on the surface side of the colored cosmetic layer 23, the degree of freedom in expressing the pattern of the colored cosmetic layer 23 is improved.

[0018] The interior material 1 in Figure 4 differs from the layer configuration example in Figure 3 in that its surface layer 2 has, in order from the surface side, a second PVC layer 22 containing vinyl chloride resin and fine particles, a colored decorative layer 23, and a first PVC layer 21 containing vinyl chloride resin. In this case, the second PVC layer 22 constitutes the outermost surface of the interior material 1. The PVC layer provided on the surface side of the colored decorative layer 23 may be made relatively thick in order to adequately protect the colored decorative layer 23. In this regard, when the second PVC layer 22 is arranged on the surface side of the colored decorative layer 23 as described above, the thickness of the first PVC layer 21, which serves as the supporting base material for the colored decorative layer 23, can be reduced. Therefore, when a decorative sheet with a colored decorative layer formed on the first PVC sheet is manufactured in advance, it becomes easier to store and transport the decorative sheet, and in particular, it becomes easier to store and transport the decorative sheet when it is rolled up.

[0019] The interior material 1 in Figure 5 differs from the layer configuration examples in Figures 3 and 4 in that the back layer 3 has a first resin layer 31 and a second resin layer 32, and the surface of the front layer 2 has a scratch-resistant layer 25. In this case, the scratch-resistant layer 25 constitutes the outermost surface of the interior material 1 and is provided to give the interior material 1 abrasion resistance, scratch resistance, and stain resistance. The scratch-resistant layer is formed of, for example, an ultraviolet-curable resin. The thickness of the scratch-resistant layer 25 is not particularly limited, but is, for example, 1 μm or more and 150 μm or less, preferably 5 μm or more and 10 μm or more and 50 μm or less. Note that in Figure 5, the surface layer 2 is shown as the layer configuration in Figure 3 (from the surface side, in order: first PVC layer 21 / colored cosmetic layer 23 / second PVC layer 22), but the layer configuration in Figure 4 (from the surface side, in order: second PVC layer 22 / colored cosmetic layer 23 / first PVC layer 21) may also be used.

[0020] Although not specifically shown in the diagram, the back layer 3 may consist only of the first resin layer 31, or it may have a fiber layer such as cheesecloth in the middle or on the very back of the back layer 3. Furthermore, although not specifically shown, the layer configuration of the back layer 3 shown in Figures 3 to 5 may be combined or substituted as appropriate. Also, although not specifically shown, some layers of the back layer 3 may be omitted, or another functional layer may be added to the back layer 3. For example, an adsorption part or an adhesive part may be provided on the back surface of the back layer 3 (not shown). The adsorption part or adhesive part is a part that adheres to the installation surface, such as a floor, in a peelable state. Examples of materials for forming the adsorption part include very soft foamed resin, and examples of materials for forming the adhesive part include peel-up adhesives.

[0021] [surface] <2nd PVC layer> The second PVC layer 22 contains a vinyl chloride resin and fine particles, and may optionally contain a plasticizer and any suitable additives. Vinyl chloride resins are polymers formed by polymerizing at least one monomer of vinyl chloride (chloroethylene). Vinyl chloride resins include not only homopolymers formed by the homopolymerization of chloroethylene, but also copolymers of chloroethylene and other monomers copolymerizable with chloroethylene, mixtures of homopolymers and copolymers, and mixtures of two or more copolymers. A mixture refers to a polymer in which homopolymers and copolymers, or copolymers, are kneaded together without substantially polymerization. Examples of vinyl chloride resins include vinyl chloride polymers (homopolymers); chlorinated vinyl chloride; partially crosslinked vinyl chloride; copolymers containing vinyl chloride, such as vinyl chloride-vinyl acetate copolymers, vinyl chloride-ethylene copolymers, vinyl chloride-propylene copolymers, vinyl chloride-styrene copolymers, vinyl chloride-isobutylene copolymers, vinyl chloride-vinylidene chloride copolymers, vinyl chloride-butadiene copolymers, vinyl chloride-isoprene copolymers, and vinyl chloride-chlorinated propylene copolymers; mixtures of homopolymers and one or more copolymers; and mixtures of two or more copolymers. Preferably, vinyl chloride polymers (homopolymers) are used. These vinyl chloride resins may be used individually or in combination of two or more types.

[0022] The vinyl chloride polymer (homopolymer) can be one produced by emulsion polymerization, suspension polymerization, solution polymerization, bulk polymerization, etc., and it is preferable to use a paste vinyl chloride resin and / or a suspension vinyl chloride resin. The paste vinyl chloride resin is, for example, a paste-like vinyl chloride resin obtained by emulsion polymerization, and its viscosity can be adjusted as appropriate with a plasticizer. The paste vinyl chloride resin is a fine powder consisting of aggregates of many fine particles with a particle size of 0.1 to 10 μm (preferably 1 μm to 3 μm), and preferably the surface of the fine powder is coated with a surfactant. The average degree of polymerization of the paste vinyl chloride resin is preferably about 1000 to 2000. The suspension vinyl chloride resin is, for example, a vinyl chloride resin obtained by suspension polymerization. The suspension vinyl chloride resin is a fine powder with a particle size of preferably 20 μm to 100 μm. The average degree of polymerization of the suspension vinyl chloride resin is preferably about 700 to 1500, more preferably about 700 to 1100, and even more preferably about 700 to 1000.

[0023] When the second PVC layer 22 contains paste vinyl chloride resin, the degree of freedom in manufacturing processes, such as foaming the second PVC layer 22, can be increased. Furthermore, when the second PVC layer 22 contains suspension vinyl chloride resin, it is possible to process it with a smaller amount of plasticizer, and a second PVC layer 22 with superior durability can be obtained. The second PVC layer 22 may contain other resins, or it may not contain other resins, provided that it contains a vinyl chloride resin as its main component resin. Here, in this specification, the main component resin of a layer means a resin that accounts for 60% by weight or more, preferably 80% by weight or more, and more preferably 90% by weight or more, of the total resin components contained in the layer (when the total resin components are considered to be 100% by weight).

[0024] Examples of fine particles include inorganic fine particles and organic fine particles. Examples of inorganic fine particles include calcium carbonate, titanium dioxide, silica, calcium oxide, barium carbonate, magnesium hydroxide, aluminum hydroxide, clay, talc, and mica. Examples of organic fine particles include fine particles made from various synthetic resins. Fine particles are added to firmly adhere the second PVC layer 22 to the colored cosmetic layer 23. Inorganic fine particles are preferred because they can further improve interlayer adhesion strength, and among these, calcium carbonate and talc are more preferred, with calcium carbonate being particularly preferred. The shape of the fine particles may be fixed, such as approximately spherical or needle-shaped, or it may be an irregular shape that cannot be particularly specified. An irregular shape is preferable because it can further improve the interlayer adhesion strength. In particular, using irregularly shaped calcium carbonate can enhance the interlayer adhesion strength.

[0025] The size of the fine particles is not particularly limited. It is preferable to use fine particles with an average particle diameter of 0.1 μm to 50 μm, more preferably with an average particle diameter of 0.1 μm to 25 μm, even more preferably with an average particle diameter of 1 μm to 10 μm, and particularly preferably with an average particle diameter of 1.5 μm to 7 μm. By using calcium carbonate within the above average particle diameter range, the interlayer adhesion strength can be increased. The average particle diameter is a value measured by laser diffraction scattering, and specifically refers to the particle diameter (D50) at which 50% of the volume cumulative particle size distribution is measured using a laser diffraction particle size distribution device.

[0026] The amount of fine particles such as calcium carbonate is not particularly limited. To further improve interlayer adhesion strength, the fine particles are preferably present in an amount of 15% to 80% by weight, more preferably 25% to 75% by weight, and even more preferably 40% to 73% by weight, based on 100% by weight of the entire second PVC layer.

[0027] Plasticizers are primarily added to improve the flexibility of vinyl chloride resins. Examples of plasticizers include polyester plasticizers, glycerin plasticizers, polycarboxylic acid ester plasticizers, and polyalkylene glycol plasticizers. Preferably, polycarboxylic acid plasticizers are used, more preferably phthalate esters, and particularly preferably dioctyl phthalate. The amount of plasticizer is not particularly limited, but by incorporating a relatively large amount of plasticizer, the interlayer adhesion strength can be increased. From this viewpoint, the amount of plasticizer is, for example, 5% by weight or more, preferably 8% by weight or more, and more preferably 10% by weight or more, based on the total weight of the second PVC layer being 100% by weight. On the other hand, if too much plasticizer is included, the second PVC layer may become too soft, so the amount of plasticizer is, for example, 25% by weight or less, and preferably 20% by weight or less.

[0028] The aforementioned additives can be those that are conventionally known, such as colorants, flame retardants, stabilizers, antioxidants, lubricants, antibacterial agents, antifungal agents, and surfactants. When additives are included, the amount is not particularly limited; for example, it may be between 0.1% and 5% by weight, with the entire second PVC layer being 100% by weight. As shown in Figure 4, when the second PVC layer 22 constitutes the surface of the interior material 1, the second PVC layer 22 is made colorless and transparent or colored and transparent in order to allow the color of the colored decorative layer 23 on the back side to be revealed. On the other hand, as shown in Figure 3, when the second PVC layer 22 is placed on the back side, it may be colorless transparent, colored transparent, or opaque. When the second PVC layer 22 is placed on the back side, it is preferable that the second PVC layer 22 be opaque, as it can conceal the back layer 3 and create a background that makes the color of the colored decorative layer 23 stand out clearly. When it is opaque, the color can be selected as appropriate, and for example, white opaque is preferably used because it is excellent in concealing the back layer 3 and in developing the color of the colored decorative layer 23.

[0029] The thickness of the second PVC layer 22 is not particularly limited, but in order to evenly adhere it to the entire colored cosmetic layer 23, it is, for example, 0.5 μm or more, preferably 1 μm or more, and more preferably 10 μm or more. There is no particular upper limit to the thickness of the second PVC layer 22, but as shown in Figure 4, when the second PVC layer 22 constitutes the surface of the interior material 1, its thickness is, for example, 2 mm or less, preferably 1 mm or less. Also, as shown in Figure 3, when the second PVC layer 22 is placed on the back side, its thickness is, for example, 9 mm or less, preferably 0.5 mm or less. In particular, when the interior material 1 consists only of the surface layer 2 and the second PVC layer 22 is placed on the back side, a second PVC layer 22 with a greater thickness is used.

[0030] <1st PVC layer> The first PVC layer 21 is a support base layer for the colored cosmetic layer 23. In other words, the colored cosmetic layer 23 is formed on the first PVC layer 21 by inkjet printing. The formed colored cosmetic layer 23 adheres firmly to the first PVC layer 21. The first PVC layer 21 contains a vinyl chloride resin and may optionally contain plasticizers, fillers, and any suitable additives. As for the vinyl chloride resin, the type described in the section above, "<Second PVC Layer>", is used. The first PVC layer 21 preferably contains a suspension polyvinyl chloride resin. The first PVC layer 21 may contain other resins, or it may not contain other resins, provided that it contains a vinyl chloride resin as its main component resin.

[0031] As for plasticizers, those described in the section on <Second PVC Layer> above are used. The amount of plasticizer is not particularly limited, but for example, with the entire first PVC layer being 100% by weight, it is 15% by weight or more and 50% by weight or less, preferably 20% by weight or more and 45% by weight or less.

[0032] The additives used are those described in the section on the second PVC layer above. When additives are added, the amount is not particularly limited; for example, it may be 0.1% by weight or more and 5% by weight or less, with the entire first PVC layer 21 being 100% by weight. As shown in Figure 3, when the first PVC layer 21 constitutes the surface of the interior material 1, the first PVC layer 21 is made colorless and transparent or colored and transparent in order to allow the color of the colored decorative layer 23 on the back side to be revealed. On the other hand, as shown in Figure 4, when the first PVC layer 21 is placed on the back side, it may be colorless and transparent, colored and transparent, or opaque. When the first PVC layer 21 is placed on the back side, it is preferable that the first PVC layer 21 be opaque, as this conceals the back layer 3 and creates a background that allows the color of the colored decorative layer 23 to stand out clearly. The color of the opaque layer can be selected as appropriate; for example, white opaque is preferably used because it provides excellent concealment of the back layer 3 and enhances the color of the colored decorative layer 23.

[0033] Fillers are primarily added to improve processability and physical properties, and to reduce product costs. The filler may be opaque, transparent, or translucent. Examples of opaque fillers include calcium carbonate, titanium dioxide, calcium oxide, barium carbonate, magnesium hydroxide, aluminum hydroxide, clay, talc, and mica. Examples of transparent or translucent fillers include resin beads and glass beads, with resin beads being particularly preferred, and acrylic beads being suitably used, for example. As shown in Figure 3, when the first PVC layer 21 constitutes the surface of the interior material 1, the filler is preferably transparent or translucent. This allows the color of the colored decorative layer 23 on the back side to be revealed.

[0034] When a filler is added, the amount is not particularly limited. For example, with the entire first PVC layer 21 being 100% by weight, the amount is 3% to 30% by weight, preferably 10% to 25% by weight. If the amount of filler is too large, the transparency of the first PVC layer may decrease. Furthermore, since the colored cosmetic layer 23 is formed by adhering inkjet ink to the first PVC layer 21, the colored cosmetic layer 23 adheres firmly to the first PVC layer 21 even if the first PVC layer 21 substantially does not contain fillers. Of course, even if the first PVC layer 21 contains the above-mentioned fillers such as calcium carbonate, the colored cosmetic layer 23 adheres firmly to the first PVC layer 21. If necessary, an ink receiving layer may be provided on the print-side surface of the first PVC layer 21.

[0035] The thickness of the first PVC layer 21 is not particularly limited, but is, for example, 0.5 μm or more, preferably 1 μm or more, and more preferably 10 μm or more, so that inkjet printing can be performed well. There is no particular upper limit to the thickness of the first PVC layer 21, but as shown in Figure 3, when the first PVC layer 21 constitutes the surface of the interior material 1, its thickness is, for example, 2 mm or less, preferably 1 mm or less. Also, as shown in Figure 4, when the first PVC layer 21 is placed on the back side, its thickness is, for example, 9 mm or less, preferably 0.5 mm or less. In particular, when the interior material 1 consists only of the surface layer 2 and the first PVC layer 21 is placed on the back side, a first PVC layer 21 with a greater thickness is used.

[0036] <Colored cosmetic layer> The colored decorative layer 23 is a layer that adds design to the interior material 1. The colored cosmetic layer 23 is formed from inkjet ink. In other words, the colored cosmetic layer 23 consists of an ink-solidified layer of inkjet ink. This colored cosmetic layer 23 is formed on the first PVC layer 21 by inkjet printing.

[0037] Inkjet inks contain resins and colorants, and optionally include any suitable additives. Inkjet inks typically use at least three colors: cyan (C), magenta (M), and yellow (Y), and may also include black (BK) or other colors as needed. Inkjet inks can be classified by their solidification method into water-based inks, solvent-based inks, and photocurable inks such as UV-curing inks. As will be described later, since inkjet printing is performed on PVC sheets, solvent-based inks or photocurable inks are preferred. Photocurable inks are more preferred because they require almost no drying time and have excellent durability, and UV-curing inks are even more preferred because they can be printed on with general-purpose printers.

[0038] The colored cosmetic layer 23 formed from the aforementioned UV-curing or other photocurable inkjet ink contains a colorant and a photocurable resin, and optionally contains any suitable additives. The coloring agent may be a dye or a pigment. The photocurable resin comprises a polymerizable monomer and / or a polymerizable oligomer (photopolymerizable prepolymer) and a photopolymerization initiator. The photocurable resin may be a radical polymerization system, a cationic polymerization system, or a mixture of radical polymerization and cationic polymerization systems.

[0039] The polymerizable oligomer is not particularly limited and includes, for example, radical polymerization type oligomers such as urethane acrylate oligomers, epoxy acrylate oligomers, and polyester acrylate oligomers, and cationic polymerization type oligomers such as vinyl ether oligomers and alicyclic epoxy oligomers (resins). The polymerizable monomer is not particularly limited and includes, for example, acrylate monomers and vinyl ether monomers. Examples of acrylate monomers include pentaerythritol triacrylate, neopentyl glycol diacrylate, and phosphoric acid-containing (meth)acrylate. Examples of phosphoric acid-containing (meth)acrylates include monomers such as acryloyloxyethyl acid phosphate and bis(2-(meth)acryloyloxyethyl) acid phosphate. Examples of vinyl ether monomers include 2-hydroxyethyl vinyl ether (HEVE), diethylene glycol monovinyl ether (DEGV), and 4-hydroxybutyl vinyl ether (HBVE). The polymerization initiator is not particularly limited and includes, for example, photoradical polymerization initiators such as benzophenone, benzoin alkyl ethers (benzoethyl ether, benzobutyl ether, etc.), benzyldimethyl ketal, and acetophenone, as well as photocationic polymerization initiators. In particular, the photocurable resin is preferably an acrylic ultraviolet-curable resin.

[0040] The thickness of the colored cosmetic layer 23 is not particularly limited, and is, for example, 0.1 μm or more and 10 μm or less, preferably 0.5 μm or more and 5 μm or less.

[0041] [Back layer] <Resin layer> The resin layers of the back surface layer 3, such as the first resin layer 31, the second resin layer 32, and the third resin layer 33, are primarily layers that constitute the strength and weight of the interior material 1. The resin layer may be a foamed material or a non-foamed material. If the back layer 3 has multiple resin layers, at least one resin layer may be made of foam and at least one resin layer may be made of non-foamed material, or all resin layers may be made of foam or non-foamed material. Also, if the back layer 3 has multiple resin layers, the main component resin of each resin layer may be different, or the main component resin of each resin layer may be the same. The resin component of the resin layer is not particularly limited and conventionally known resins can be used. Generally, thermoplastic resins are used, and moreover, soft thermoplastic resins are used. Examples of thermoplastic resins include vinyl chloride resins, polyolefin resins, urethane resins, vinyl acetate resins such as ethylene-vinyl acetate copolymers, acrylic resins such as ethylene-methacrylate resins, polyamide resins, ester resins, various elastomers such as olefin elastomers and styrene elastomers, and rubber. These can be used individually or in combination of two or more. It is preferable that the resin layer contains vinyl chloride resin as the main component resin because it is inexpensive, has excellent flexibility and durability, and adheres firmly to the surface layer 2. As the vinyl chloride resin of the resin layer, those described in the section on <Second PVC Layer> above can be used.

[0042] When the resin layer of the back layer 3 has a vinyl chloride resin as its main component, it may contain, for example, a vinyl chloride resin, a plasticizer, and a filler, and may contain various additives as needed. For example, when the resin layer is considered as 100% by weight, it may contain 20% to 60% by weight of vinyl chloride resin, 5% to 15% by weight of plasticizer, 30% to 80% by weight of filler, and 0.1% to 5% by weight of additives. The thickness of the resin layer is not particularly limited, but is, for example, 0.3 mm or more and 9 mm or less, preferably 0.4 mm or more and 7 mm or less. If the back surface layer 3 has multiple resin layers, the range of the resin layer thickness refers to the total thickness of the multiple resin layers.

[0043] <Fiber layer> The fiber layer of the back layer 3 is a layer that maintains the dimensional stability of the interior material 1. Examples of fiber layers include nonwoven fabrics and woven fabrics. The material of the fibers constituting the nonwoven or woven fabric is not particularly limited and includes, for example, synthetic resin fibers such as polyester and polyolefin; inorganic fibers such as glass and carbon; and natural fibers. In particular, it is preferable to use a glass sheet containing glass fibers as the fiber layer because it exhibits little dimensional change due to temperature.

[0044] [Manufacturing method for interior materials] The interior material 1 of the present invention can be manufactured by the following manufacturing method, but the interior material 1 of the present invention is not limited to that manufactured by the following manufacturing method. A method for manufacturing interior materials includes the steps of: preparing a decorative sheet having a first PVC sheet containing a vinyl chloride resin and a colored decorative layer formed by printing inkjet ink onto the first PVC sheet; preparing a second PVC sheet containing a vinyl chloride resin and fine particles; and forming a laminate consisting of a first PVC sheet, a colored decorative layer, and a second PVC sheet by integrating the decorative sheet and the second PVC sheet under heated conditions. An interior material having a backing layer is obtained by forming a backing layer on the laminate. For example, an interior material as shown in Figure 3 is obtained by forming a backing layer on the second PVC sheet of the laminate on the side opposite to the colored decorative layer. Also, for example, an interior material as shown in Figure 4 is obtained by forming a backing layer on the first PVC sheet of the laminate on the side opposite to the colored decorative layer. The back layer may be formed simultaneously with the process of forming the laminate, or it may be formed in advance on the second PVC sheet or the first PVC sheet before the process of forming the laminate, or it may be formed on the second PVC sheet or the first PVC sheet of the laminate after the laminate has been formed. When manufacturing an interior material having a back layer, it is preferable to form the back layer simultaneously with the process of forming the laminate, since the interior material can be manufactured in a single lamination process. The following explanation will take the case of forming a back layer during the lamination process as an example.

[0045] <Preparation process for decorative sheets> The first PVC sheet corresponds to the first PVC layer. The first PVC sheet, as described in the section on <First PVC Layer> above, contains a vinyl chloride resin and may optionally contain a plasticizer, filler, and any suitable additives. The first PVC sheet is obtained by mixing these vinyl chloride resins and forming a film. The film formation method is not particularly limited and includes, for example, calendering, melt extrusion, and solution casting. Inkjet ink is printed on one side of the first PVC sheet using an inkjet printer. As the inkjet ink, those described in the section on <Colored Cosmetic Layer> above can be used, preferably light-curing inkjet inks such as UV-curing inks, and more preferably acrylic UV-curing inkjet inks. With an inkjet printer, any design can be easily reproduced. A decorative sheet is obtained in which a colored decorative layer is formed on the first PVC sheet by printing inkjet ink onto the first PVC sheet and then solidifying the ink. The method of solidifying the ink depends on the ink; for example, in the case of UV-curable inkjet ink, a predetermined amount of UV light is used for irradiation.

[0046] <Preparation process for the second PVC sheet> The second PVC sheet corresponds to the second PVC layer. The second PVC sheet, as described in the section on <Second PVC Layer> above, contains a vinyl chloride resin and fine particles, and may optionally contain a plasticizer and any suitable additives. The second PVC sheet is obtained by mixing these vinyl chloride resin and fine particles and forming a film. The film formation method is not particularly limited and includes, for example, calendering, melt extrusion, and solution casting.

[0047] <Preparation process for the back layer> As explained in the section on [Layer Composition of Interior Materials] above, various combinations of layers are possible for the back layer. Depending on the back surface layer to be formed, a resin layer or fiber layer is prepared. For the resin layer, for example, a resin sheet formed into a film can be used. In the case of a resin layer whose main component is a vinyl chloride resin, as explained in the <Resin Layer> section above, a resin sheet is obtained by mixing the vinyl chloride resin, plasticizer, and filler, etc., and forming it into a film.

[0048] <Lamination process> As shown in Figure 6, an aggregate 71 is formed by stacking the decorative sheet 4 (first PVC sheet 51 and colored decorative layer 53), the second PVC sheet 52, and the back layer forming material 6 in that order from the surface side. The decorative sheet 4 is placed on top of the second PVC sheet 52 so that the colored decorative layer 53 of the decorative sheet 4 faces the second PVC sheet 52. A laminated structure 72 is formed by heating this aggregate 71 to bond adjacent sheets and each layer. In Figure 6, the back layer forming material 6 is made up of a resin sheet 61, a fiber layer 64, and a resin sheet 62 stacked in that order from the surface side, and a back layer 3 consisting of a resin layer 31 / fiber layer 34 / resin layer 32 is formed by bonding these together. The heating temperature is above the melting temperature of the vinyl chloride resin, for example, 140°C to 200°C. It is preferable to pressurize the aggregate 71 to bond the layers more firmly. The pressurization method is not particularly limited, and examples include passing the pile 71 through pressurizing rollers 81 and 82 as shown in the illustrated example, or pressing a press plate (not shown) over the pile 71 from above and below. The pressurizing pressure is not particularly limited, and is, for example, 0.5 MPa to 10 MPa, preferably 1 MPa to 5 MPa. Heating and pressurizing may be performed simultaneously, or pressurizing may be performed after heating. When heating and pressurizing are performed simultaneously, heated pressurizing rollers or the like are used.

[0049] The resulting laminated structure 72 consists of, in order from the surface side, a first PVC layer 21, a colored decorative layer 23, a second PVC layer 22, and a back layer 3, and is used as an interior material. If necessary, after forming the laminated structure 72, optional processes such as embossing the surface and / or back surface of the laminated structure 72, or forming a scratch-resistant layer on the surface of the laminated structure 72, may be performed, and this can also be used as an interior material.

[0050] In Figure 6, the decorative sheet 4 (first PVC sheet 51 and colored decorative layer 53), the second PVC sheet 52, and the back layer forming material 6 are stacked in that order from the surface side. However, as shown in Figure 7, for example, the stacked material 73 may be formed by stacking the second PVC sheet 52, the decorative sheet 4 (colored decorative layer 53 and first PVC sheet 51), and the back layer forming material 6 in that order from the surface side. In this case as well, the second PVC sheet 52 is placed on top of the decorative sheet 4 so that the colored decorative layer 53 of the decorative sheet 4 faces the second PVC sheet 52. Afterwards, in the same manner as in Figure 6, by heating, and preferably by heating and pressurizing, a laminated structure 74 consisting of the second PVC layer 22 / colored decorative layer 23 / first PVC layer 21 / back layer 3 can be formed in that order from the surface side. The laminated structure 74 can be used as is as an interior material, or, as described above, any optional process such as embossing the surface and / or back surface of the laminated structure 74, or forming a scratch-resistant layer on the surface of the laminated structure 74, may be performed and then used as an interior material.

[0051] [Use of interior materials] The interior materials of the present invention can be used as flooring, walling, and ceilinging materials in buildings. Walling can be used in a manner similar to wallpaper, as well as as wainscoting that connects to flooring. The aforementioned interior material is applied to surfaces such as floors, walls, and ceilings using an adhesive.

[0052] The interior material of the present invention has a colored decorative layer on the surface formed from inkjet ink, so the colored decorative layer can be formed by inkjet printing, and a desired design can be easily displayed. Furthermore, since the surface layer has a first PVC layer containing a vinyl chloride resin, a colored decorative layer, and a second PVC layer containing a vinyl chloride resin and fine particles in this order, it has excellent interlayer adhesion strength and is less prone to peeling at the interface between the first PVC layer and the colored decorative layer, and between the colored decorative layer and the second PVC layer. In particular, by including a predetermined amount of calcium carbonate as fine particles or by using calcium carbonate with a predetermined average particle size, a surface layer that is less prone to interlayer delamination can be constructed. This is also evident from the examples below. [Examples]

[0053] The present invention will be further described below with reference to examples and comparative examples. However, the present invention is not limited to the following examples.

[0054] [Example 1] <Production of decorative sheets> A first PVC sheet was produced by thoroughly mixing 100 parts by weight of polyvinyl chloride resin (suspension-type polyvinyl chloride resin, product name "ZEST-800Z" manufactured by Shin-Daiichi Vinyl Chloride Co., Ltd., degree of polymerization: 820), 29 parts by weight of plasticizer (dioctyl phthalate), and 3 parts by weight of Ba-Zn stabilizer, and then forming it into a film with a thickness of approximately 0.28 mm using a calendering machine set to a roll temperature of 150°C. A decorative sheet consisting of the first PVC sheet and a colored decorative layer was produced by printing a solid color of UV-curable inkjet ink onto one side of the first PVC sheet using an inkjet printer equipped with a UV irradiation device, and then irradiating it with UV light. The inkjet ink was an acrylic-based UV-curable ink containing magenta dye.

[0055] <Production of the second PVC sheet> A second PVC sheet was produced by thoroughly mixing 100 parts by weight of polyvinyl chloride resin (suspension-type polyvinyl chloride resin, product name "ZEST-800Z" manufactured by Shin-Daiichi Vinyl Chloride Co., Ltd., degree of polymerization: 820), 100 parts by weight of calcium carbonate (product name "First Grade" manufactured by Sankyo Seizo Co., Ltd.), 29 parts by weight of plasticizer (dioctyl phthalate), and 3 parts by weight of Ba-Zn stabilizer. The mixture was then formed into a film approximately 0.5 mm thick using a calendering machine with the roll temperature set to 150°C. The calcium carbonate (fine particles) used in the second PVC sheet of Example 1 was irregular in shape and had an average particle size of 20 μm. When the above weight portions are converted to weight percentages, with the entire second PVC sheet being 100% by weight, the polyvinyl chloride resin is approximately 43.1% by weight, calcium carbonate is approximately 43.1% by weight, the plasticizer is approximately 12.5% ​​by weight, and the stabilizer is approximately 1.3% by weight.

[0056] <Fabrication of back-surface layer forming material> 100 parts by weight of polyvinyl chloride resin (suspension-type polyvinyl chloride resin, product name "ZEST800Z" manufactured by Daiichi Vinyl Chloride Co., Ltd., degree of polymerization: 820), 36 parts by weight of plasticizer (dioctyl phthalate), 259 parts by weight of filler (calcium carbonate, a mixture of product name "KP200" manufactured by Hitachi Crushed Stone Co., Ltd. and product name "TA074B" manufactured by Chichibu Limestone Industry Co., Ltd.), and 3 parts by weight of Ca-Zn stabilizer (product name "HE-1218G" manufactured by Katsuta Chemical Co., Ltd.) were thoroughly mixed, and then molded into a film approximately 1.7 mm thick using a calendering machine with the roll temperature set to 150°C to produce one resin sheet. This single resin sheet was used as the back layer forming material.

[0057] <Manufacturing of interior materials> The assembled material, consisting of a decorative sheet (first PVC sheet / colored decorative layer), a second PVC sheet, and a resin sheet, was heated to 140°C and pressurized using a press machine to integrate each sheet. The pressure applied to the assembled material by the press machine was set to approximately 0.8 MPa. In this way, an interior material consisting of a first PVC layer, a colored decorative layer, a second PVC layer, and a back layer was fabricated in that order from the surface side.

[0058] [Example 2] In preparing the second PVC sheet, the interior material was prepared in the same manner as in Example 1, except that calcium carbonate with an average particle size of 20 μm was not incorporated, and instead 100 parts by weight of talc (product name "Rose Talc A" manufactured by Nippon Talc Co., Ltd.) with an average particle size of 16 μm was incorporated.

[0059] [Example 3] The interior material was prepared in the same manner as in Example 1, except that when preparing the second PVC sheet, calcium carbonate with an average particle size of 20 μm was not added, and instead 100 parts by weight of talc (product name "MS-KY" manufactured by Nippon Talc Co., Ltd.) with an average particle size of 18 μm was added.

[0060] [Comparative Example] Except for not incorporating fine particles such as calcium carbonate when preparing the second PVC sheet, the interior material was prepared in the same manner as in Example 1.

[0061] [Peel test] The peel strength of the first PVC layer and the second PVC layer of the interior materials in the examples and comparative examples was measured as follows. The measurement results are shown in Table 1. The interior material was cut into pieces measuring 200mm x 50mm, and these were used as sample pieces. Two sample pieces were prepared at arbitrary locations. The first and second PVC layers were forcibly peeled off from one end of the sample piece in the vertical direction for a length of approximately 50mm, and the separated first and second PVC layers were fixed to the upper and lower fixtures of a precision universal testing machine (product name "Tensilon Universal Testing Machine RTF-1310" manufactured by A&D Co., Ltd.). The separated first and second PVC layers were pulled so that they formed a 180-degree angle, and the two layers were further peeled off by 50mm (so-called 180-degree peeling), and the force required at that time was measured. Measurements were taken at 10mm, 20mm, 30mm, 40mm, and 50mm peeling, and the average of these five measurement values ​​was taken as the peel strength.

[0062] [Table 1]

[0063] After peeling off the interior materials of Examples 1 to 3 and the Comparative Example, the condition of the peeled surfaces was visually observed. In Examples 1 to 3, the peeled surfaces of the first PVC layer and the second PVC layer were colored red, indicating that the colored decorative layer remained on the peeled surfaces of both PVC layers. From this, it is presumed that in Examples 1 to 3, the colored decorative layer underwent material failure. On the other hand, in the Comparative Example, the peeled surface of the second PVC layer was sparsely and lightly colored, suggesting that peeling occurred mainly at the interface between the second PVC layer and the colored decorative layer. The reason for the difference in peel strength (interlayer adhesion strength) between the examples and comparative examples is not clear, but the inventors have hypothesized the following. The colored cosmetic layer is obtained by printing inkjet ink onto the first PVC sheet and allowing it to solidify, so the first PVC layer and the colored cosmetic layer are firmly bonded. However, even when the second PVC sheet is layered and bonded to the colored cosmetic layer, which is the ink-solidified layer, sufficient adhesive strength cannot be obtained (see comparative example). The exact reason for this is not clear, but it is presumed that by incorporating fine particles as in the example, fine irregularities are formed on the surface of the second PVC sheet, increasing the contact area between the second PVC sheet and the colored cosmetic layer, thus resulting in strong adhesion between the second PVC layer and the colored cosmetic layer.

[0064] [Example 4] The interior material was prepared in the same manner as in Example 1, except that when preparing the second PVC sheet, 100 parts by weight (approximately 43.1% by weight) of calcium carbonate with an average particle size of 1.8 μm (product name "Escalon #2000" manufactured by Sankyo Flour Milling Co., Ltd.) with an average particle size of 1.8 μm was added instead of calcium carbonate with an average particle size of 20 μm.

[0065] [Example 5] The interior material was prepared in the same manner as in Example 1, except that when preparing the second PVC sheet, 100 parts by weight (approximately 43.1% by weight) of calcium carbonate with an average particle size of 3.5 μm (product name "Escalon #800" manufactured by Sankyo Flour Milling Co., Ltd.) with an average particle size of 3.5 μm was added instead of calcium carbonate with an average particle size of 20 μm.

[0066] [Example 6] The interior material was prepared in the same manner as in Example 1, except that when preparing the second PVC sheet, 100 parts by weight (approximately 43.1% by weight) of calcium carbonate with an average particle size of 5 μm (product name "Escalon #200" manufactured by Sankyo Flour Milling Co., Ltd.) with an average particle size of 5 μm was added instead of calcium carbonate with an average particle size of 20 μm.

[0067] The peel strength of the interior materials of Examples 4 to 6 was measured in the same manner as in the [Peel Test] described above. The results are shown in Table 2. For comparison, Example 1 described in Table 1 is also shown in Table 2.

[0068] [Table 2]

[0069] A comparison of Examples 1 and 4 to 6 shows that the second PVC layer containing fine particles with a smaller average particle size adheres more firmly to the colored cosmetic layer. This is presumed to be because smaller fine particles have a larger specific surface area than larger fine particles when added in the same amount, thus improving the effect of the fine particles in increasing the contact area between the second PVC sheet and the colored cosmetic layer.

[0070] [Example 7] The interior material was prepared in the same manner as in Example 1, except that when preparing the second PVC sheet, 20 parts by weight of calcium carbonate with an average particle size of 5 μm (product name "Escalon #200" manufactured by Sankyo Flour Milling Co., Ltd.) with an average particle size of 5 μm was added instead of calcium carbonate with an average particle size of 20 μm. The second PVC layer obtained in Example 7 contains approximately 65.8% by weight of vinyl chloride resin, approximately 13.2% by weight of calcium carbonate, approximately 19.1% by weight of plasticizer, and approximately 2.0% by weight of stabilizer.

[0071] [Example 8] The interior material was prepared in the same manner as in Example 7, except that the amount of calcium carbonate was 30 parts by weight. The second PVC layer obtained in Example 8 contains approximately 61.7% by weight of vinyl chloride resin, approximately 18.5% by weight of calcium carbonate, approximately 17.9% by weight of plasticizer, and approximately 1.9% by weight of stabilizer.

[0072] [Example 9] The interior material was prepared in the same manner as in Example 7, except that the amount of calcium carbonate was 50 parts by weight. The second PVC layer obtained in Example 9 contains approximately 54.9% by weight of vinyl chloride resin, approximately 27.5% by weight of calcium carbonate, approximately 15.9% by weight of plasticizer, and approximately 1.6% by weight of stabilizer.

[0073] [Example 10] An interior material was prepared in the same manner as in Example 7, except that the amount of calcium carbonate was set to 100 parts by weight. The second PVC layer obtained in Example 10 contains approximately 43.1% by weight of vinyl chloride resin, approximately 43.1% by weight of calcium carbonate, approximately 12.5% ​​by weight of plasticizer, and approximately 1.3% by weight of stabilizer.

[0074] [Example 11] The interior material was prepared in the same manner as in Example 7, except that the amount of calcium carbonate was 150 parts by weight. The second PVC layer obtained in Example 11 contains approximately 35.5% by weight of vinyl chloride resin, approximately 53.2% by weight of calcium carbonate, approximately 10.3% by weight of plasticizer, and approximately 1.1% by weight of stabilizer.

[0075] [Example 12] An interior material was prepared in the same manner as in Example 7, except that the amount of calcium carbonate was 300 parts by weight. The second PVC layer obtained in Example 12 contains approximately 23.1% by weight of vinyl chloride resin, approximately 69.4% by weight of calcium carbonate, approximately 6.7% by weight of plasticizer, and approximately 0.7% by weight of stabilizer.

[0076] [Example 13] The interior material was prepared in the same manner as in Example 7, except that the amount of calcium carbonate was 450 parts by weight. The second PVC layer obtained in Example 13 contains approximately 17.2% by weight of vinyl chloride resin, approximately 77.3% by weight of calcium carbonate, approximately 5.0% by weight of plasticizer, and approximately 0.5% by weight of stabilizer.

[0077] The peel strength of the interior materials of Examples 7 to 13 was measured in the same manner as in the [Peel Test] described above. The results are shown in Table 3.

[0078] [Table 3]

[0079] Examples 7 to 13 show that a second PVC layer containing 77.3% by weight or less of fine particles adheres firmly to the colored cosmetic layer. In particular, a comparison between Example 12 and Example 13 shows a significant difference in peel strength between filler concentrations of approximately 69% by weight and 77% by weight. Therefore, it is considered that the amount of fine particles in the second PVC layer should be less than 77.3% by weight, more preferably 75% by weight or less, and even more preferably 73% by weight or less. Furthermore, the results from Example 8 show that the peel strength is sufficient even when the amount of fine particles is 18.5% by weight. Considering the results from Examples 7 to 10, it is considered that the amount of fine particles in the second PVC layer is preferably 15% by weight or more, more preferably 20% by weight or more, even more preferably 25% by weight or more, and particularly preferably 35% by weight or more.

[0080] [Example 14] Except for changing the amount of plasticizer to 43.5 parts by weight when preparing the second PVC sheet, the interior material was prepared in the same manner as in Example 13. The second PVC layer obtained in Example 14 contains approximately 16.7% by weight of vinyl chloride resin, approximately 75.4% by weight of calcium carbonate, approximately 7.3% by weight of plasticizer, and approximately 0.5% by weight of stabilizer.

[0081] [Example 15] Except for changing the amount of plasticizer to 58 parts by weight when preparing the second PVC sheet, the interior material was prepared in the same manner as in Example 13. The second PVC layer obtained in Example 15 contains approximately 16.4% by weight of vinyl chloride resin, approximately 73.6% by weight of calcium carbonate, approximately 9.5% by weight of plasticizer, and approximately 0.5% by weight of stabilizer.

[0082] The peel strength of the interior materials of Examples 14 and 15 was measured in the same manner as in the [Peel Test] described above. The results are shown in Table 4. For comparison, Example 13, described in Table 3, is also shown in Table 4.

[0083] [Table 4]

[0084] A comparison of Examples 13 to 15 shows that the PVC layer with a relatively high amount of plasticizer adheres more strongly to the colored cosmetic layer. This is presumed to be because it prevents the PVC sheet from becoming too rigid due to the large amount of fine particles used in its formulation. Based on these results, it is preferable to incorporate a larger amount of plasticizer, but if too much plasticizer is added, the second PVC sheet becomes too soft and difficult to handle. Considering these points, the amount of plasticizer is considered to be 25% by weight or less, preferably 20% by weight or less, and more preferably 15% by weight or less. [Explanation of Symbols]

[0085] 1. Interior materials 2 Surface layer 21 1st PVC layer 22 2nd PVC layer 23,53 Colored cosmetic layer 3. Back layer 4 Decorative sheet 51. First PVC Sheet 52. Second PVC Sheet

Claims

1. Having a surface layer including a colored cosmetic layer, An interior material having, in this order, a surface layer comprising a first PVC layer containing a vinyl chloride resin, a colored decorative layer formed from inkjet ink, and a second PVC layer containing a vinyl chloride resin and fine particles.

2. The interior material according to claim 1, wherein the inkjet ink comprises a colorant and a photocurable resin.

3. The interior material according to claim 1 or 2, wherein the fine particles are contained in an amount of 15% by weight or more and 80% by weight or less, based on 100% by weight of the entire second PVC layer.

4. The interior material according to any one of claims 1 to 3, wherein the fine particles contain calcium carbonate with an average particle diameter of 0.1 μm or more and 50 μm or less.

5. A step of preparing a decorative sheet having a first PVC sheet containing a polyvinyl chloride resin and a colored decorative layer formed on the first PVC sheet, The process of preparing a second PVC sheet containing polyvinyl chloride resin, The process includes a step of forming a laminate consisting of a first PVC sheet, a colored decorative layer, and a second PVC sheet by integrating the decorative sheet and the second PVC sheet under heated conditions. The colored cosmetic layer is formed by printing inkjet ink onto the first PVC sheet using an inkjet printer. A method for manufacturing interior materials, wherein the second PVC sheet contains fine particles.

6. The method for manufacturing interior material according to claim 5, further comprising forming a back surface layer on the laminate.

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