JP2016069572A - Substrate sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a substrate sheet which can correspond to a design comprising varied textures, hues, and patterns, can provide excellent adhesion and finish, and can shorten a work period of construction of a decorative sheet, and to provide a construction method of a decorative sheet using the substrate sheet.SOLUTION: A substrate sheet has a first primer layer on one surface of a base substrate layer and a second primer layer on another surface, and has a convexoconcave shape on the first primer layer-side surface, where the concave portion which constitutes the convexoconcave shape is continuous, the surface of the first primer layer has arithmetic average roughness Ra in accordance with JIS B0601-1994 of 2 to 14 μm, and ten-point average roughness Rz of 15 to 55 μm and a thickness of the base substrate layer is 45 μm or more. Also provided is a construction method of a decorative sheet using the substrate sheet.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a base sheet.

  Architectural interior materials such as wallpaper are required to have excellent design to enhance the comfort in the building, to realize designs with a variety of textures, colors and patterns, and to cope with complex shapes Various decorative sheets are used. Especially for interior materials such as commercial facilities, office buildings, stores, etc., for non-residential applications, it is possible to save time and labor for applying adhesives at the work site and reduce work time at the work site. A decorative sheet with a pressure-sensitive adhesive coated with a pressure-sensitive adhesive is frequently used (for example, Patent Document 1). In order to ensure long-term adhesion between the decorative sheet and the adherend, it is common to perform a sealing process on the adherend. However, the sealing process requires several days for curing, leading to a longer construction period and an increased burden on workers. In addition, when constructing a decorative sheet with an adhesive used in such applications, air remains between the decorative sheet and the adherend, so-called air biting is likely to occur, and the air expands as the temperature rises. As a result, the appearance deteriorates and the adhesive strength decreases.

  In order to solve such a problem, a decorative sheet has been proposed that attempts to improve the entrainment of bubbles (so-called air biting) by providing a protruding portion having a predetermined shape in the pressure-sensitive adhesive layer (for example, Patent Document 2). ).

JP 2007-106001 A JP 2001-302999 A

  However, when a convex ridge and a groove for air bleeding are formed in the adhesive layer, the uneven shape of the convex ridge and the groove for air bleeding affects the surface of the decorative sheet. There may be a limitation that a material or a design in which the influence of the uneven shape of the agent layer is not conspicuous must be selected. For example, in a design with high glossiness or a metallic design, there is a problem in the manufacturing process that the marks of the uneven shape provided on the adhesive layer are noticeable when storing the roll, and the uneven shape appears on the surface after construction. Therefore, there are cases where it is difficult to use for a decorative sheet having a design in which the influence of the uneven shape is conspicuous.

Therefore, when a design is desired in which the effect of the uneven shape of the pressure-sensitive adhesive layer appears on the surface, it is necessary to use a decorative sheet that does not have the uneven shape in the pressure-sensitive adhesive layer in order to ensure the design. As a result, air biting is likely to occur. Therefore, there is a demand for a method that is excellent in finish and can be easily applied without being limited to the design of the decorative sheet.
In addition, when used in an application where a gypsum board or a medium density fiber board is used as an adherend, the decorative sheet is also required to have moisture resistance to suppress humidity permeation.

  The object of the present invention is to provide an excellent adhesion between the decorative sheet and the adherend designed with a variety of textures, colors and patterns, ensure a good finish, and shorten the construction period of the decorative sheet. It is providing the construction method of a sheet | seat and a decorative sheet using the same.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the problem can be solved by the following invention. That is, the present invention provides the following base sheet, laminate, and decorative sheet construction method.

[1] A concave portion that has a first primer layer on one surface of the base substrate layer, a second primer layer on the other surface, and has a concavo-convex shape on the surface of the first primer layer, and constitutes the concavo-convex shape The arithmetic mean roughness Ra of the surface of the first primer layer according to JIS B0601-1994 is 2 to 14 μm, the ten-point average roughness Rz is 15 to 55 μm, and the base group A base sheet having a material layer thickness of 45 μm or more.
[2] A laminate having the base sheet according to [1] above, a pressure-sensitive adhesive layer, and a decorative sheet having at least a base sheet and a decorative layer in order.
[3] A method for constructing a decorative sheet, comprising sequentially laminating the base sheet according to [1] above an adherend, and laminating a decorative sheet having at least a base material and a decorative layer.

  ADVANTAGE OF THE INVENTION According to this invention, the base sheet which can respond to the design which consists of various textures, colors, and patterns, has excellent adhesion and finish, and can shorten the construction period of the decorative sheet, and uses this It is possible to provide a method for constructing a decorative sheet.

It is a schematic diagram which shows the cross section of an example of the base sheet of this invention. It is a schematic diagram which shows the cross section of an example of the base sheet of this invention. It is a schematic diagram which shows the cross section of the other example of the base sheet of this invention. It is a schematic diagram which shows the plane of an example of the base sheet of this invention.

[Base sheet]
The base sheet of the present invention has a first primer layer on one surface of the base substrate layer, a second primer layer on the other surface, and has an uneven shape on the surface of the first primer layer, the uneven shape And the arithmetic average roughness Ra of the surface of the first primer layer according to JIS B0601-1994 is 2 to 14 μm, and the ten-point average roughness Rz is 15 to 55 μm. And the thickness of a base base material layer is 45 micrometers or more, It is characterized by the above-mentioned.

  A base sheet 10 of the present invention shown in FIG. 1 is a schematic view showing a cross section of an example of a preferred embodiment of the base sheet of the present invention, and has a base substrate layer 1 and a first primer layer 2 on one surface thereof. The second primer layer 3 is provided on the other surface, and the first primer layer 2 has a concave portion 22 and a plurality of convex portions 21. In this specification, the surface of the base substrate layer 1 on which the first primer layer 2 is provided may be referred to as the front surface, and the surface on which the second primer layer 3 is provided may be referred to as the back surface.

(Base substrate layer)
The base substrate layer is a layer that functions as a support that holds the first primer layer and the second primer layer. Preferred examples of the resin for forming the base substrate layer include polyester resins, polyolefin resins, vinyl chloride resins, vinyl chloride-vinyl acetate copolymer resins, and ethylene-vinyl acetate copolymer resins. Among them, polyester resins and polyolefin resins. Vinyl chloride resin is preferable, and polyolefin resin is preferable from the viewpoint of moisture resistance. By using a resin with excellent moisture resistance as the resin for forming the base substrate layer, even if it is used in applications where gypsum board or medium density fiberboard is used as an adherend, these adherends warp. It becomes difficult.

  Examples of the polyolefin include polyethylene (low density, medium density, high density), polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer, and the like, from the viewpoint of moisture resistance. Polypropylene is most preferred.

  It does not specifically limit as a polyester resin, What is normally used in the field | area of a decorative sheet can be used. Examples thereof include polyethylene terephthalate (hereinafter sometimes referred to as “PET”), polybutylene terephthalate, polyethylene naphthalate, polyarylate, polycarbonate, ethylene terephthalate-isophthalate copolymer, polyarylate, and the like. Of these, polyethylene terephthalate, polybutylene terephthalate, and the like are preferable. Also preferred are amorphous polyester resins such as amorphous polyethylene terephthalate.

  The base substrate layer may be transparent or colored. Colorants include carbon black (black), iron black, titanium white, antimony white, yellow lead, titanium yellow, petal, cadmium red, ultramarine, cobalt blue and other inorganic pigments, quinacridone red, isoindolinone yellow, phthalocyanine Organic pigments or dyes such as blue, as well as bright pigments such as metal pigments, pearlescent (pearl) pigments, and luminous pigments are used.

  The thickness of the base substrate layer needs to be 45 μm or more. When the thickness of the base substrate layer is less than 45 μm, it is difficult to obtain a predetermined uneven shape. In addition, since the unevenness of the adherend itself appears on the surface of the base sheet, the unevenness appears after the decorative sheet is applied, and the design is deteriorated, and good moisture resistance cannot be obtained, and Handling of the base sheet is not easy. The thickness of the base substrate layer may be 45 to 300 μm from the viewpoint of making the uneven shape of the first primer layer favorable, and obtaining excellent design and moisture resistance, and further ease of handling of the base sheet. Preferably, it is 50-200 micrometers, and it is further more preferable that it is 75-150 micrometers. Here, the thickness of a base base material layer is the thickness of the base material before embossing provision, when giving the uneven | corrugated shape mentioned later to a base base material layer using an embossing plate.

The base substrate layer preferably has an uneven shape on the surface of the base substrate itself in order to impart an uneven shape to the first primer layer side surface of the base sheet. In this case, the uneven shape on the first primer layer side surface substantially corresponds to the uneven shape of the base substrate layer. That is, the first primer layer is preferably formed by applying (so-called solid coating) the resin composition for forming the first primer layer over the entire surface of the base substrate layer having an uneven shape.
Preferred examples of the method for imparting a concavo-convex shape to the base substrate layer include application by pressing an embossed plate, application by cueing a filler from the film surface by kneading a granular filler into the film, or sandblasting. It is done. Among these, from the viewpoint of the reproducibility of the concavo-convex shape and mass productivity, it is desirable to provide the concavo-convex shape by pressing the embossed plate. In this case, for example, when the synthetic base resin layer forming the base material layer is formed into a sheet shape by various molding methods such as a T-die extrusion molding method, the extruded sheet has an uneven shape. By pressing while cooling with a roll, the uneven shape defined in the present invention can be imparted to the surface of the substrate layer.

The concave / convex shape of the base substrate layer is a shape in which concave portions constituting the concave / convex shape are continuous. This uneven shape promotes air leakage between the surface of the base sheet and the adhesive surface of the base sheet when the base sheet is applied to the adherend on which the base sheet has been applied in advance, and air biting occurs. It is a shape for suppressing.
For example, as shown in FIGS. 1 and 4, the first primer layer has a large number of convex portions, and the concave portions exist so as to surround the convex portions, and the concave portions are formed by taking a continuous form. It exists continuously to the periphery of the sheet. Therefore, it becomes possible to draw out air that has been involved during construction through a recess that continues to the peripheral edge of the sheet. “Concave portions are continuous” means that the concave portion at any point communicates as a single groove. Thus, the recess may be in the form of a closed path with one side closed, but does not take an independent form with the entire circumference closed. This is because, if the independent form in which the entire circumference of the concave portion is closed is taken, air cannot be released when air is caught in the concave portion.

  The shape of the convex portion is not particularly limited, and may be, for example, a substantially hemispherical shape as shown in 3b of FIGS. 1 and 3, or a substantially conical shape as shown in 3a of FIG. Furthermore, it may be a cone shape such as a substantially polygonal pyramid shape, a cylindrical shape or a prismatic shape, a pyramid shape from the bottom to the middle, and a conical shape near the top. The shape which combined these shapes etc. is illustrated. Among these, considering the adhesion to the interior material, a substantially hemispherical, cylindrical, or prismatic shape in which the shape of the top is a shape close to a plane is preferable.

The sizes of the convex portions may or may not be uniform, but are preferably uniform from the viewpoint of obtaining uniform adhesiveness and reducing the influence of the uneven shape on the surface of the interior material.
Further, the arrangement of the protrusions may be a regular pattern arrangement or a random arrangement without irregularities. From the viewpoint of obtaining uniform adhesion, for example, FIG. Such a regular pattern arrangement is preferable. As the regular arrangement, for example, an arrangement at a lattice-like intersection position, a staggered arrangement in which the phase is changed in adjacent rows or columns, and the like are preferably mentioned.

The distance (Pa) between the apexes of adjacent convex portions shown in FIG. 2 is preferably 30 to 500 μm. Moreover, as for the distance (Pb) between the bottom parts of the adjacent recessed part shown by FIG. 2, 30-500 micrometers is preferable. When these distances are within the above range, excellent adhesiveness can be obtained and a good air bleeding effect can be obtained, so that air biting is suppressed and an excellent finish can be obtained.
Moreover, it is preferable that the height (H) of a convex part shown by FIG. 2 is 5-20 micrometers, It is more preferable that it is 8-15 micrometers, It is further more preferable that it is 10-12 micrometers. If the height is within the above range, the air vent groove will not be crushed, and a good air venting effect will be obtained, so that air biting will be suppressed, and the influence of the uneven shape on the surface of the interior material will be sufficiently small So that an excellent finish is obtained.
In addition, when the concavo-convex shape is imparted to the base substrate layer by the embossed plate, the thickness (Te) of the base substrate layer after the concavo-convex shape is imparted is To ± 20 μm with respect to the thickness (To) before the embossed shape impartation It becomes the thickness of.

In order to improve the adhesion with the first primer layer and the second primer layer, the base substrate layer may be subjected to corona discharge treatment, ozone treatment, plasma treatment, ionizing radiation treatment, dichromic acid treatment on one or both sides as desired. A surface treatment such as The surface treatment may be performed according to a conventional method for each treatment.
Further, the base substrate layer may be subjected to a treatment such as forming an easy-adhesion layer for enhancing interlayer adhesion.

(First primer layer)
The surface side of the first primer layer has a concavo-convex shape, the concave portions constituting the concavo-convex shape are continuous, and the arithmetic mean roughness of the surface of the first primer layer in accordance with JIS B0601-1994 Ra is a layer having a thickness of 2 to 14 μm and a ten-point average roughness Rz of 15 to 55 μm. By having such properties, the first primer layer ensures adhesion to architectural interior materials such as wallpaper, and promotes air leakage during construction, regardless of the interior material used. It is a layer that suppresses the occurrence of biting.
As described above, the concavo-convex shape of the first primer layer is preferably a concavo-convex shape corresponding to the concavo-convex shape in the base substrate layer, and the resin composition for forming the first primer layer in the base substrate layer having the concavo-convex shape is used. It is preferable to form the product by applying it over the entire surface (so-called solid coating). In this case, since the uneven shape of the first primer layer has a layer with a predetermined thickness following the base substrate layer having the uneven shape, the uneven shape is substantially the same as the uneven shape of the base substrate layer. .

  The surface of the first primer layer is required to have an arithmetic average roughness Ra of 2 to 14 μm based on JIS B0601-1994 and a ten-point average roughness Rz of 15 to 55 μm. Since the surface of the first primer layer has the arithmetic average roughness Ra and the ten-point average roughness Rz as the surface properties, a good air venting effect can be obtained, so that the air biting is suppressed, and the interior Since the influence of the uneven shape on the surface of the material can be sufficiently reduced, an excellent finish can be obtained. These arithmetic average roughness Ra and ten-point average roughness Rz can be measured using, for example, a contact-type surface roughness meter.

  From the viewpoint of suppressing air biting and obtaining an excellent finish, the arithmetic average roughness Ra is preferably 2 to 10 μm, and more preferably 4 to 10 μm. The ten-point average roughness Rz is preferably 15 to 40 μm, and more preferably 25 to 40 μm. These surface properties can be adjusted by the distance (Pa) between the apexes of adjacent convex portions, the distance (Pb) between the bottom portions of adjacent concave portions, the height (H) of the convex portions, and the like.

  The thickness of the first primer layer is preferably 1 to 5 μm, more preferably 1 to 3 μm, and further preferably 1 to 2 μm. When the thickness is within the above range, good adhesion can be obtained, and the air vent groove due to the uneven shape on the surface of the first primer layer side is not crushed, and a good air venting effect is obtained. In addition, since the influence of the uneven shape on the surface of the interior material can be sufficiently reduced, an excellent finish can be obtained.

  The resin forming the first primer layer may be appropriately selected according to the combination with the material of the interior material, and is not particularly limited. For example, acrylic resin, urethane resin, acrylic-urethane copolymer resin, vinyl chloride- Preferred examples include cellulose acetate resins such as vinyl acetate copolymer resins, polyester resins, butyral resins, chlorinated polypropylene, chlorinated polyethylene, and nitrified cotton, and these can be used alone or in combination. Among these, acrylic resins, urethane resins, and acrylic urethane copolymer resins are preferable. When these resins are used, it is easy to obtain excellent adhesion to the interior material.

  Acrylic resins include homopolymers of acrylate esters, copolymers of two or more different acrylate ester monomers, or copolymers of acrylate esters with other monomers. Methyl acrylate, polyethyl acrylate, polypropyl acrylate, polybutyl acrylate, methyl acrylate-butyl acrylate copolymer, ethyl acrylate-butyl acrylate copolymer, ethylene-methyl acrylate copolymer, An acrylic resin made of a homopolymer or a copolymer containing an acrylate ester such as a styrene-methyl acrylate copolymer is preferably used.

  As the urethane resin, a two-component curable urethane resin having a polyol (polyhydric alcohol) as a main component and an isocyanate as a crosslinking agent (curing agent) can be used. As the polyol, one having two or more hydroxyl groups in the molecule, for example, polyester polyol, polyethylene glycol, polypropylene glycol, acrylic polyol, polyether polyol and the like are used. Examples of the isocyanate include polyvalent isocyanate having two or more isocyanate groups in the molecule, aromatic isocyanate such as 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate. Aliphatic (or alicyclic) isocyanates such as are used. It is also possible to mix urethane resin and butyral resin.

  As the acrylic-urethane copolymer resin, for example, an acrylic-urethane (polyester urethane) block copolymer resin is preferable. As the curing agent, the above-mentioned various isocyanates are used. The acrylic / urethane (polyester urethane) block copolymer resin has an acrylic / urethane ratio (mass ratio) of preferably (9/1) to (1/9), more preferably (8/2) to (2), as desired. / 8) may be used.

The first primer layer may contain an additive as necessary. Examples of the additive include a filler, a flame retardant, an antioxidant, and a lubricant.
Of the above additives, it is preferable to contain an inorganic filler such as calcium carbonate, barium sulfate, clay, talc and the like. In the present invention, the contact between the base sheet and the decorative sheet is in the vicinity of the apex of the convex portion of the base sheet and close to point adhesion, but excellent adhesion can be obtained by adding an inorganic filler.
The content of these inorganic fillers is preferably in the range of 1 to 60% by mass with respect to the resin forming the first primer layer.

(Second rimer layer)
The second primer layer is a layer for improving adhesion with the adherend.
The resin used for forming the second primer layer may be appropriately selected according to the combination with the material of the adherend, and is not particularly limited, but the resin used for forming the first primer layer is preferably exemplified. The
Moreover, it is preferable that the thickness of a 2nd primer layer is 0.5-5 micrometers, It is more preferable that it is 1-3 micrometers, It is further more preferable that it is 1-2 micrometers. When the thickness is within the above range, excellent adhesion to the adherend can be obtained.

(Moisture permeability)
Moisture permeability of the base sheet of the present ^{invention, 0.1~16g / (m 2 · 24h} ) are ^{preferred, 0.1~10g / (m 2 · 24h} ) are more preferable, 0.1~8g / (m ² -24h) is more preferred. If the moisture permeability of the base sheet is within the above range, good moisture resistance can be obtained. For example, an adherend that is likely to warp due to humidity such as gypsum board or medium density wood fiber board (MDF) can be used. No warping occurs.
The moisture permeability of the moisture permeable film is measured by a method based on JIS Z0208 (cup method). Specifically, the measurement was performed in a constant temperature and humidity environment at a temperature of 40 ° C. and a relative humidity of 90%, and in the presence of 15 g of calcium chloride as a hygroscopic agent. It is a value calculated as an arithmetic average value by randomly selecting and measuring three locations of the moisture-permeable film.

(Masking film)
The base sheet of the present invention may be provided with a masking film on the surfaces of the first primer layer and the second primer layer as necessary. By providing the masking film (protective film), transportation of the base sheet, scratches during construction work, and adhesion of dust and dust can be prevented, so that better adhesion can be obtained.

As a base material for masking films, polyester films, such as a polyethylene terephthalate (PET) film, polyolefin films, such as a polyethylene film and a polypropylene film, a polycarbonate film, etc. are mentioned preferably.
Although there is no restriction | limiting in particular about the thickness of this base material for masking films, It is preferable that it is 10-100 micrometers, and it is more preferable that it is 30-70 micrometers. When the thickness is within the above range, good scratch resistance can be obtained, turning and peeling are difficult to occur during processing, and cost can be reduced.

The masking film substrate is attached to the first primer layer and the second primer layer via an adhesive. Examples of the pressure-sensitive adhesive include, in addition to acrylic pressure-sensitive adhesives mainly composed of (meth) acrylic acid ester-based polymers, rubber, from the viewpoint of being difficult to peel off during storage, easy to peel off during use, and difficult to leave behind pressure-sensitive adhesives. Preferable are a PSA adhesive and a silicone adhesive.
Moreover, 5-40 micrometers is preferable and, as for the thickness of the adhesive layer for masking films which apply | coated these adhesives, 10-30 micrometers is more preferable. When the thickness of the pressure-sensitive adhesive layer is within the above range, it is difficult to peel off during storage, it is easy to peel off during use, and the pressure-sensitive adhesive residue is difficult to leave.

(Preparation method of base sheet)
The base sheet of the present invention is, for example, a resin that forms a first primer layer on the surface having a concavo-convex shape of a base substrate layer having a concavo-convex shape on one surface by pressing with an embossed plate, and if necessary First primer layer having a concavo-convex shape corresponding to the concavo-convex shape of the base substrate layer by applying (solid coating) the first primer layer-forming resin composition containing the additive used in the whole surface Next, the second primer layer-forming resin composition is applied to the other surface to form the second primer layer.
Application | coating of the resin composition for 1st primer layer formation and the resin composition for 2nd primer layer formation can be performed by printing methods, such as a silk screen printing method, a gravure printing method, and a rotary screen printing method, for example.

In addition, the base sheet of the present invention is obtained by applying a resin composition for the first primer layer containing a resin for forming the first primer layer and an additive used as necessary on one surface of the base substrate layer. A step of forming the first primer layer by coating (so-called solid coating) over the entire surface of the layer, and then applying the second primer layer forming resin composition to the other surface to form the second primer layer It can also be manufactured through a process and a process of embossing the first primer layer.
In this case, for example, after the base substrate layer is formed into a sheet shape by various molding methods such as a T-die extrusion molding method, the resin composition for forming the substrate layer is formed over the entire surface of the base substrate layer. By applying the resin composition for forming the primer layer to form the first primer layer, and pressing the embossing roll having the concavo-convex shape, the surface of the base material layer is provided with the concavo-convex shape defined in the present invention, The 1st primer layer which has the uneven | corrugated shape prescribed | regulated by this invention can be obtained. Moreover, even when not using the roll which has the above uneven | corrugated shape, a predetermined shape can be given by giving an uneven | corrugated shape to a 1st primer layer, for example by the hot-pressure embossing by a flat embossing plate etc. .
In addition, as shown in 3c of FIG. 3, it is also possible to give the uneven | corrugated shape by a 1st primer layer to the whole surface of a base base material layer with uniform thickness.

[Laminate]
The laminate of the present invention comprises the above-described base sheet, pressure-sensitive adhesive layer, and at least a base sheet and a decorative sheet having a decorative layer in order.
The decorative sheet is not particularly limited as long as it has design properties, such as a decorative sheet and a commercially available wallpaper as long as it has at least a base material and a decorative layer. For example, a decorative sheet having a decorative layer composed of a pattern or the like on a paper-based substrate or a resin sheet substrate, or a decorative sheet having a surface protective layer formed of a curable resin composition on the decorative layer In addition, a foamed wallpaper having a foamed resin layer is preferable.

Moreover, the laminated body of this invention has an adhesive layer between a base sheet and a decorative sheet. The pressure-sensitive adhesive layer may be provided on the decorative sheet in advance, or may be formed by applying a pressure-sensitive adhesive to the base sheet or the decorative sheet at the construction site.
As the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer, a material having tackiness (adhesive strength), transparency, coating suitability, etc. can be appropriately selected and used from known pressure-sensitive adhesives.
For example, an acrylic adhesive, a rubber adhesive, a polyester adhesive, etc. are mentioned. Among these, an acrylic pressure-sensitive adhesive is preferable because it is excellent in transparency, adhesiveness, and heat resistance.

  The thickness of the pressure-sensitive adhesive layer is preferably 30 to 80 μm, and more preferably 35 to 70 μm. When the thickness of the pressure-sensitive adhesive layer is within the above range, excellent adhesion can be obtained. Some decorative sheets to be used have a pressure-sensitive adhesive layer having a concavo-convex shape for preventing air bite, but in the present invention, the pressure-sensitive adhesive layer may or may not have a concavo-convex shape. Even if the adhesive layer of the decorative sheet does not have an uneven shape, if the base sheet of the present invention is used, it corresponds to a design consisting of various textures, colors and patterns, and an excellent finish can be obtained. In addition, the construction period of the decorative sheet can be shortened.

[Construction method of decorative sheet]
The method for applying a decorative sheet of the present invention is characterized by sequentially including a step of laminating the base sheet of the present invention on an adherend and a step of laminating a decorative sheet having at least a base material and a decorative layer.
Examples of the adherend include non-residential use, for example, interior materials for interiors of commercial facilities, office buildings, stores, etc., specifically, gypsum boards such as gypsum boards and gypsum slag boards, calcium silicate boards, and asbestos slate boards. , Lightweight foam concrete board, cement board such as hollow extrusion cement board, pulp cement board, asbestos cement board, fiber cement board such as wood chip cement board, etc., and low density wood fiber board such as insulation board, tatami board, shiaging board, etc. , Medium density wood fiberboard (MDF), and high density wood fiberboard such as hard board. Since the base sheet of the present invention can also have excellent moisture-proof properties, it is an adherend that is susceptible to warping and that is susceptible to moisture, such as gypsum board and medium density wood fiber board (MDF). Even if the surface of the adherend has a rough shape with irregularities, the irregularities appear on the surface of the decorative sheet without performing a complicated and time-consuming treatment such as a sealing treatment. No matter what kind of decorative sheet is used without any limitation on the design and material, an excellent finish can be obtained and an excellent adhesion can be obtained.

  The base sheet may be laminated on these adherends by applying an adhesive to the adherend and attaching the base sheet. A general-purpose adhesive can be used without limitation. In the present invention, when laminating the base sheet, it is not necessary to apply a sealing treatment (primer treatment) to the adherend, and it is possible to directly laminate the adherend via an adhesive. For this reason, it has become possible to shorten the period of several days required for curing the sealing treatment.

  Next, a decorative sheet having at least a base sheet and a decorative layer is laminated. As the decorative sheet having at least a base material and a decorative layer, those described as the decorative sheet used in the laminate may be used. When the decorative sheet has an adhesive layer in advance, it may be laminated on the base sheet as it is. When the decorative sheet does not have an adhesive layer, the adhesive sheet is applied to the base sheet and the decorative sheet is laminated. .

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
In addition, the various characteristics of the base sheet obtained in each example were evaluated according to the following procedures.

<Measurement of surface roughness>
About the surface of the base sheet obtained in each example, using a contact type surface roughness meter (“SV3000S4 (model number)”, manufactured by Mitutoyo Corporation), arithmetic average roughness Ra based on JIS B0601-1994, ten points The average roughness Rz was measured.

<Evaluation of workability; evaluation of air biting>
An adherend ("BA-10 (trade name)", Chuo Rika Kogyo Co., Ltd., thickness: 80 μm) is applied to an adherend (medium density wood fiberboard (MDF), 30 cm square), and the adherend A base sheet having the same size as the above was laminated. Next, a decorative sheet with a 30 cm square adhesive ("Riatec TC-7240 (trade name)", manufactured by Sangetsu Co., Ltd., with air bleeding groove in the adhesive layer), "Riatech TC-7252 (trade name)", Sangetsu The state of the air biting when the product made by Co., Ltd. and the pressure-sensitive adhesive layer was provided with an air vent groove) was laminated with a squeegee, and evaluated according to the following criteria.
A: No air biting was confirmed.
○: Air biting was hardly confirmed.
Δ: Air biting was confirmed slightly, but there was no change in the design of the decorative sheet, and there was no problem in practical use.
X: There was air biting, and it was not in a state to withstand practical use.

<Evaluation of adhesion>
In the base sheet obtained in each example, a decorative sheet with an adhesive ("Reartec TC-7240 (trade name)" (adhesive layer with air vent groove, manufactured by Sangetsu Co., Ltd.), "Reartech TC-7563 (product Name) "(no air bleeding groove in the adhesive layer), made by Sangetsu Co., Ltd.) was attached by pressing the rubber roller back and forth twice. After leaving at 23 ° C. and 65% RH for 48 hours, in accordance with the 180 ° peel test specified in JIS Z0237, using a 25 mm wide adhesive tape, measuring the peel strength at a peel rate of 300 mm / min in the 180 ° direction, Evaluation was made according to the following criteria.
○: 20N or more Δ: 15N or more and less than 20N Δ ×: 10N or more and less than 15N ×: less than 10N

<Evaluation of moisture resistance: Warpage of adherend>
To adherend (steel plate ("Superdimer (trade name)", manufactured by Nippon Steel & Sumikin Co., Ltd., thickness: 0.8 mm), wood substrate (laminated plywood, thickness: 18 mm) and adhesive ("BA-10 (product Name) ”, manufactured by Chuo Rika Kogyo Co., Ltd., thickness: 80 μm), and the base sheet obtained in each example was laminated. Stored indoors (room temperature; 23 ° C.) and deposited after one month. The appearance of the body was visually observed and evaluated according to the following criteria.
○: No warpage was confirmed on the adherend.
○ △: Almost no warpage was confirmed on the adherend.
Δ: Slight warpage was confirmed on the adherend, but there was no practical problem.
X: Warpage was confirmed on the adherend.
For each adherend (74 mm × 304 mm, thickness: 18 mm), the rate of change in length per 1% moisture content when changing from 20 ° C. 40% RH to 20 ° C. 85% RH It was measured as the rate of change in moisture absorption length of the body.

Example 1
A white polypropylene film (thickness: 120 μm, “Art Ply (trade name)”, manufactured by Diaplus Film Co., Ltd.) was prepared as a base substrate layer. After embossing the surface, corona treatment was applied to both sides (embossing). The later thickness was 135 μm for the concave and convex portions and 110 μm for the concave portions). Thereafter, the first primer layer composition (polyester-based acrylic-urethane copolymer resin (acrylic / urethane ratio = 20/80) 80 parts by mass and nitrification on one side of the base substrate layer subjected to corona treatment on both sides Dissolved in 35 parts by mass of a mixed solvent of methyl ethyl ketone and butyl acetate (80 parts by mass of methyl ethyl ketone, 20 parts by mass of butyl acetate) in a resin obtained by adding 5 parts by mass of hexamethylene diisocyanate as a curing agent to a total of 100 parts by mass with 20 parts by mass of cotton resin The first primer layer having a thickness of 1.5 μm was formed by applying the solution) so as to have a solid content of 1.5 g / m ² by a gravure printing method. Next, 5 parts by mass of hexamethylene diisocyanate was added as a curing agent to a total of 100 parts by mass of 80 parts by mass of the second primer layer composition (acrylic / urethane ratio = 20/80) and 20 parts by mass of nitrified cotton resin on the back surface. A solution of methyl ethyl ketone and butyl acetate (a solution of 80 parts by mass of methyl ethyl ketone, 20 parts by mass of methyl ethyl ketone) mixed in 35 parts by mass of the resin is applied to the resin by a gravure printing method so that the solid content becomes 1.5 g / m ^2. A second primer layer having a thickness of 1.5 μm was formed to obtain a base sheet having a thickness of 123 μm. The moisture permeability of the obtained base sheet was 2 g / (m ² · 24 h). The uneven shape of the surface of the obtained base sheet is composed of a concave portion and a plurality of convex portions as shown in FIG. 4, and the concave portions are continuous, and the convex portion is a substantially hemispherical shape close to a semi-ellipsoid. The shape was a fine circular pattern. Further, Table 1 shows the results of evaluating the obtained base sheet by the above method.

Examples 2-10, Comparative Examples 1-3
In Example 1, the resin and thickness of the base substrate layer, the resin of the first primer layer, the arithmetic average roughness Ra and the ten-point average roughness Rz of the base sheet were changed as shown in Table 1, and In Comparative Examples 1 to 3, a base sheet was obtained in the same manner as in Example 1 except that the concave-convex convex portion was a fine conical pattern having a conical shape. The results evaluated in the same manner as in Example 1 are shown in Table 1 or Table 2.

* 1, PP: Colored polypropylene resin film ("Art Ply (trade name)", manufactured by Diaplus Film Co., Ltd., Color: White)
PE: colored polyethylene resin film ("Art Ply (trade name)", manufactured by Diaplus Film Co., Ltd., color: white)
PETG: Amorphous polyethylene terephthalate resin film ("Diafix (trade name)", manufactured by Mitsubishi Plastics, color: white)
PVC: Polyvinyl chloride resin film ("Rivester (trade name)", manufactured by Riken Technos Co., Ltd., color: white)
* 2. The thickness of the base material is the thickness after extrusion (thickness before embossing).
* 3, AU: Polyester acrylic-urethane copolymer resin (acrylic / urethane ratio = 20/80) 80 parts by mass and 20 parts by mass of nitrified cotton resin, 5 parts by mass of hexamethylene diisocyanate as a curing agent Solution A: Acrylic resin U: Urethane resin * 4, Example 2: Implementation of fine circular pattern in a mixed solvent of 35 parts by mass of methyl ethyl ketone and butyl acetate (80 parts by mass of methyl ethyl ketone, 20 parts by mass of butyl acetate) Example 3: Fine circular pattern comparison example 1: Fine cone pattern comparison example 2: Fine cone pattern comparison example 3: Fine cone pattern * 5, decorative sheet 1: “Reartec TC-7240 (trade name)” (Sangetsu Co., Ltd.) Made by company, adhesive layer has air vents)
Decorative sheet 2: “Riatec TC-7252 (trade name)” (manufactured by Sangetsu Co., Ltd., without air bleeding groove in the adhesive layer)
* 6, decorative sheet 1: “Reartec TC-7240 (trade name)” (manufactured by Sangetsu Co., Ltd., with air bleeding groove in the adhesive layer)
Decorative sheet 2: “Reartec TC-7563 (trade name)” (manufactured by Sangetsu Co., Ltd., without air bleeding groove in the adhesive layer)
* 7, Substrate: Steel plate ("Superdimer (trade name)", manufactured by Nippon Steel & Sumikin Co., Ltd., thickness: 0.8mm)
Substrate 2: wood base (laminated plywood, thickness: 18 mm)

  From Table 1, all the base sheets of the present invention had excellent adhesion and moisture resistance, and were easily obtained without any air biting. In particular, even when a decorative sheet with a conspicuous uneven shape such as a mirror finish was used, the finish was excellent without picking up the uneven shape of the adherend or base sheet. On the other hand, the base sheet of Comparative Example 1 having a small arithmetic average roughness Ra and ten-point average roughness Rz did not have sufficient air leakage and air biting, and an excellent finish was not obtained. In the base sheet of Comparative Example 2 having a large arithmetic average roughness Ra and ten-point average roughness Rz, air could be sufficiently removed, so that air biting did not occur, but adhesion was not obtained. In addition, the base sheet of Comparative Example 3 in which the first primer layer was not provided did not obtain adhesion.

  ADVANTAGE OF THE INVENTION According to this invention, the base sheet which can respond to the design which consists of various textures, colors, and patterns, has excellent adhesion and finish, and can shorten the construction period of the decorative sheet, and uses this It is possible to provide a method for constructing a decorative sheet. This base sheet is useful as a base material for architectural interior materials, especially interior materials for non-residential applications, for example, interior materials for commercial facilities, office buildings, stores, and the like.

DESCRIPTION OF SYMBOLS 10 Ground sheet 1 Base base material layer 2 1st primer layer 3 2nd primer layer 20 Concave and convex shape 21 of 1st primer layer 21 Convex part 22 of 1st primer layer Concave part 1st primer layer

Claims (7)

  It has a first primer layer on one side of the base substrate layer, a second primer layer on the other side, and has a concavo-convex shape on the surface of the first primer layer, and the concave portions constituting the concavo-convex shape are continuous. And the arithmetic average roughness Ra of the surface of the first primer layer according to JIS B0601-1994 is 2 to 14 μm, the ten-point average roughness Rz is 15 to 55 μm, and the base substrate layer A base sheet having a thickness of 45 μm or more.   The base sheet according to claim 1, wherein the uneven shape on the first primer layer side surface corresponds to the uneven shape on the surface of the base substrate layer.   The base sheet according to claim 1 or 2, wherein the resin forming the first primer layer is at least one selected from an acrylic resin, a urethane resin, and an acrylic-urethane copolymer resin. The base sheet according to any one of claims 1 to 3, wherein the moisture permeability according to JIS Z0208 is 0.1 to 16 g / (m ² · 24 h).   The base sheet according to any one of claims 1 to 4, wherein the resin forming the base substrate layer is a polyolefin resin.   The laminated body which has the base sheet in any one of Claims 1-5, the adhesive layer, and the decorative sheet which has a base material sheet and a decoration layer at least in order.   The construction method of the decorative sheet which has the process of laminating | stacking the base sheet in any one of Claims 1-5 on a to-be-adhered body, and the process of laminating | stacking the decorative sheet which has a base material and a decoration layer at least.