JP2017159584A - Moisture-proof decorative plate and building material, decorative plate, and decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moisture-proof decorative plate and building material, a decorative plate, and a decorative sheet which are excellent in shock resistance and caster resistance.SOLUTION: There are included: a thermoplastic resin base layer 1; a thermoplastic resin backing layer 8 that is disposed on a back surface 1b of the thermoplastic resin base layer 1; a pattern layer 2 that is disposed on a front surface 1a of the thermoplastic resin base layer 1; a transparent adhesive layer 3 that is disposed on the pattern layer 2; and a transparent thermoplastic resin layer 4 that is disposed on the transparent adhesive layer 3. The thermoplastic resin backing layer 8 has a thickness of 100 μm or more and 300 μm or less and includes a sheet including at least one or more of a crystalline polyester resin in an amorphous state, an amorphous polyester resin, a biaxially-stretched polyester resin, a polypropylene homopolymer, a propylene-ethylene random copolymer, a propylene-ethylene block copolymer, and a polyester resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a moisture-proof decorative board and building materials, a decorative board, and a decorative sheet.

Decorative sheets have been developed and developed in the process of residential construction developing as an industry. In particular, it can be said that prefabricated architecture has played a leading role in apartments, condominiums, and individual houses that are collective housing.
Since ancient times, houses have been made of materials based on local characteristics, such as wood and stone, and people have lived in styles rooted in their own culture, but with the development of the housing industry, the transition from natural materials to artificial materials has progressed. Has been done. In recent years, the heavy use of high-grade wood and stone materials can lead to deforestation and environmental problems, which is another factor that increases the demand for decorative sheets.
For example, in recent years, a so-called sheet flooring material in which a decorative sheet is bonded to the surface of a wood substrate such as plywood, MDF (medium fiber plate) or particle board has been widely used as a flooring material (Patent Document 1). reference).

Japanese Patent No. 5045180

Conventionally, improvement of impact resistance, caster resistance, and other characteristics has been desired for flooring materials in which a decorative sheet is bonded to the surface of a wooden substrate.
The present invention has been made in view of such a situation, and an object thereof is to provide a moisture-proof decorative board, a building material, a decorative board, and a decorative sheet excellent in impact resistance and caster resistance.

  In order to solve the above-described problems, a moisture-proof decorative board according to one aspect of the present invention includes a wooden base material, a decorative sheet provided on one surface side of the wooden base material, and the other surface of the wooden base material. A moisture-proof sheet provided on the side, and the decorative sheet includes a thermoplastic resin base layer facing the back side of the wood base and a thermoplastic provided on the back side of the thermoplastic resin base layer A resin back layer, a pattern layer provided on the surface side of the thermoplastic resin substrate layer, a transparent adhesive layer provided on the pattern layer, and a transparent thermoplastic provided on the transparent adhesive layer And the thermoplastic resin back layer has a thickness of 100 μm or more and 300 μm or less, and an amorphous crystalline resin, an amorphous polyester resin, a biaxially stretched polyester resin, or a polypropylene alone Polymer, propylene-ethylene It consists of a sheet | seat containing at least 1 or more types among a ren random copolymer, a propylene-ethylene block copolymer, and a polyester-type resin, It is characterized by the above-mentioned.

  According to one embodiment of the present invention, it is possible to provide a moisture-proof decorative board, a building material, a decorative board, and a decorative sheet that are excellent in impact resistance and caster resistance.

It is sectional drawing which shows the structural example of the decorative sheet 10 which concerns on embodiment of this invention. It is sectional drawing which shows the structural example of the moisture-proof decorative board 20 which concerns on embodiment of this invention. It is sectional drawing which shows the structural example of the building materials 30 and 40 which concern on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, parts corresponding to each other are denoted by the same reference numerals, and repeated description of the same reference numerals will be omitted as appropriate. Further, the embodiment of the present invention exemplifies a configuration for embodying the technical idea of the present invention, and specifies the material, shape, structure, arrangement, dimensions, etc. of each part as follows. Not. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

<Coating sheet>
FIG. 1 is a cross-sectional view illustrating a configuration example of a decorative sheet 10 according to an embodiment of the present invention.
As shown in FIG. 1, this decorative sheet 10 includes a thermoplastic resin substrate layer 1, a thermoplastic resin back layer 8 provided on the back surface 1 b side of the thermoplastic resin substrate layer 1, and a thermoplastic resin substrate. The pattern pattern layer 2 provided on the surface 1a side of the layer 1, the transparent adhesive layer 3 provided on the pattern pattern layer 2, and the transparent thermoplastic resin layer 4 provided on the transparent adhesive layer 3 . That is, in the decorative sheet 10 shown in FIG. 1, the thermoplastic resin back surface layer 8, the thermoplastic resin base material layer 1, the pattern layer 2, the transparent adhesive layer 3, and the transparent thermoplastic resin layer 4 are laminated at least in this order. Yes.

Here, the thermoplastic resin back layer 8 has a thickness of 100 μm or more and 300 μm or less, and an amorphous crystalline polyester resin, amorphous polyester resin, biaxially stretched polyester resin, polypropylene homopolymer, propylene- It consists of a sheet containing at least one or more of an ethylene random copolymer, a propylene-ethylene block copolymer, and a polyester resin.
In addition, although the wording regarding the transparent adhesive layer 3 “provided on the design pattern layer 2” means that the transparent adhesive layer 3 is provided on the design pattern layer 2, the design pattern layer 2 is provided. This expression also includes a case where another layer further exists between the transparent adhesive layer 3 and the transparent adhesive layer 3. The same meaning is used when the word “above” is used to express the relationship between other layers.

Further, this decorative sheet 10 has a thickness of 3 μm or more and 50 μm or less on the surface 4a side of the transparent thermoplastic resin layer 4, and is made of an ionizing radiation curable resin (for example, an ultraviolet curable resin) and a thermosetting resin. It has the surface protective layer 7 which has at least one as a main component. Here, the ionizing radiation curable resin is a synthetic resin that chemically changes from a liquid to a solid in response to the energy of ionizing radiation (for example, ultraviolet rays, α rays, β rays, or γ rays). . The surface protective layer 7 may be a single layer film or a laminated film in which a plurality of layers are laminated. The surface protective layer 7 shown in FIG. 1 is an example in the case of being composed of two layers, a first surface protective layer 5 and a second surface protective layer 6.
The second surface protective layer 6 is an outermost layer located at least on the outermost surface of the surface protective layer 7. The second surface protective layer 6 has a 60-degree specular gloss value of 20 or more and 35 or less in accordance with JIS Z 8741. The second surface protective layer 6 is mainly composed of a mixture of an ultraviolet curable resin and a thermosetting resin and contains a matting agent, and the content of the matting agent is less than 10% by mass.
The thermoplastic resin back layer 8 is a silica-containing resin layer containing silica powder.

Hereinafter, each configuration of the decorative sheet 10 will be described more specifically.
(1) Thermoplastic resin base material layer The thermoplastic resin base material layer 1 is made of, for example, a colored thermoplastic resin. As the thermoplastic resin, for example, vinyl chloride resin, acrylic resin, polyolefin-based polypropylene resin or polyethylene resin can be used. Of these, polyolefin resins can be preferably used in terms of environmental compatibility, processability, and cost. In addition, the grade and composition of the resin can be selected in consideration of ease of sheeting, printability, and suitability for bending.
When the thermoplastic resin base material layer 1 is colored, the base material to which the decorative sheet is bonded is concealed, and the hue can be appropriately selected as the background color of the pattern layer 2. For example, when a thermoplastic resin is sheeted, it can be colored by mixing and kneading a colorant such as a pigment. Alternatively, a colored layer can be provided under the pattern layer 2 by using a coating or printing technique as a solid ink layer before the pattern layer 2 is provided.

(2) Pattern pattern layer The pattern pattern layer 2 can be provided using a known printing technique. When the thermoplastic resin base material layer 1 can be prepared in a wound state, printing for forming the pattern layer 2 can be performed with a roll-to-roll printing apparatus. The printing method is not particularly limited, but for example, a gravure printing method can be used in consideration of productivity and picture quality.
Any design pattern may be used in consideration of the design as a flooring material, and various wood grain patterns are often used for wood-based patterns. It can also be. For example, if it is an image of a stone floor such as marble, it may be used as a pattern such as a marble stone. In addition to the pattern made of natural materials, an artificial pattern such as an artificial pattern or a geometric pattern using these as a motif can also be used.

The printing ink for forming the pattern layer 2 is not particularly limited, but an ink corresponding to the printing method can be appropriately selected and used. In particular, it is preferable to select in consideration of adhesion to the thermoplastic resin substrate layer 1, printability, and weather resistance as a flooring material.
If necessary, on the pattern layer 2 for the purpose of improving the adhesion between the pattern layer 2 and the transparent adhesive layer 3 and improving the adhesion between the transparent layer 3 and the transparent thermoplastic resin layer 4. An adhesive layer (not shown) may be provided. The resin used for the adhesive layer (not shown) is not particularly limited. For example, a two-component curable urethane resin or the like can be used, and can be provided using a coating apparatus or a gravure printing apparatus.

(3) Transparent Adhesive Layer The transparent adhesive layer 3 is provided for the purpose of strengthening the adhesion between the thermoplastic resin substrate layer 1 and the pattern layer 2 and the transparent thermoplastic resin layer 4. When this adhesion is strong, it is possible to give the decorative sheet 10 bending workability that follows a curved surface or a right-angled surface. The transparent adhesive layer 3 is colorless and transparent or colored and transparent, and may be colored to such an extent that visible light can be transmitted.

(4) Transparent thermoplastic resin layer The transparent thermoplastic resin layer 4 can be made of, for example, vinyl chloride resin, acrylic resin, polyolefin-based polypropylene resin or polyethylene resin. Of these, polyolefin resins can be preferably used in terms of environmental compatibility, processability, and cost.
In addition, the grade and composition of the resin can be selected in consideration of ease of sheeting, printability, and suitability for bending. In particular, in bending workability, it is important to select in consideration that whitening and cracking of the bent portion do not occur.
The transparent adhesive layer 3 and the transparent thermoplastic resin layer 4 can be formed by, for example, co-extrusion and extruding both at the same time.
The transparent thermoplastic resin layer 4 has an effect that the decorative sheet has a thickness and depth that are designed to increase, and can improve the weather resistance and wear resistance of the decorative sheet. The transparent thermoplastic resin layer 4 is colorless and transparent or colored and transparent, and may be colored to such an extent that visible light can be transmitted.

(5) Surface protective layer A surface protective layer 7 is provided on the transparent thermoplastic resin layer 4. As described above, the thickness of the surface protective layer 7 is 3 μm or more and 50 μm or less. When the thickness of the surface protective layer 7 is thinner than 3 μm, the performance such as scratch resistance may be deteriorated. Moreover, when the thickness of the surface protective layer 7 is thicker than 50 μm, the workability may be reduced. The surface protective layer 7 may be a single layer, or a plurality of layers may be stacked to form the surface protective layer 7. In the decorative sheet 10 of the present embodiment, as shown in FIG. 1, two layers of a first surface protective layer 5 and a second surface protective layer 6 are provided as the surface protective layer 7.

The surface protective layer 7 has an important role in determining the superiority or inferiority in terms of bending workability, scratch resistance and cleanability. In addition, it is important to select in consideration of cleanability. As a result of intensive studies on this point, we have found the following knowledge. That is, the main component of the second surface protective layer 6 corresponding to the outermost layer of the surface protective layer 7 is a mixture of an ultraviolet curable resin and a thermosetting resin, so that scratch resistance when used on the floor can be obtained. At the same time, it was found that whitening and cracking of the surface protective layer are less likely to occur during bending.
The second surface protective layer 6 corresponding to at least the outermost layer of the surface protective layer 7 is made of a mixture of an ultraviolet curable resin and a thermosetting resin. You may provide another additive suitably to the mixture. The mixing ratio of the ultraviolet curable resin and the thermosetting resin is set so as to be in the range of 5: 5 to 9: 1 in terms of mass ratio. That is, in the mixture, the ultraviolet curable resin is 42.5% by mass or more and 90% by mass or less, and the thermosetting resin is 8.5% by mass or more and 50% by mass or less. The main component refers to, for example, 85% or more of the total mass of the mixture of the ultraviolet curable resin and the thermosetting resin.

As described above, the main component of the second surface protective layer 6 corresponding to the outermost layer of the surface protective layer 7 is a mixture of an ultraviolet curable resin and a thermosetting resin, so that it is scratch resistant when used on a floor. In addition to satisfying the properties, whitening and cracking of the surface protective layer are less likely to occur during bending.
In addition, silica or other matting agent is added to the second surface protective layer 6, and the matting agent to be added and the amount thereof are adjusted to comply with JIS Z 8741 of the second surface protective layer 6. The 60-degree specular gloss value was adjusted to 20 or more and 35 or less. The gloss value adjustment by adjusting the content of the matting agent is generally known. However, in the present invention, the unevenness after wiping becomes noticeable by utilizing the “property of adsorbing substances” of these matting agents. It came to realize the effect.

Thus, by setting the 60-degree specular gloss value of the second surface protective layer 6 according to JIS Z 8741 to 20 or more and 35 or less, unevenness after wiping during cleaning becomes conspicuous.
In order to provide the surface protective layer 7 composed of the first surface protective layer 5 and the second surface protective layer 6, each layer is applied and coated using a known coating apparatus, thermal drying apparatus and ultraviolet irradiation apparatus. Can be cured.
About the 1st surface protective layer 5, you may use resin of the composition similar to the 2nd surface protective layer 6 of the outermost layer, and you may use what changed the kind, composition, and ratio of resin separately. Absent.

(6) Thermoplastic resin back layer As described above, the thickness of the thermoplastic resin back layer 8 is not less than 100 μm and not more than 300 μm. When the thickness of the thermoplastic resin back layer 8 is thinner than 100 μm, the performance such as impact resistance, load resistance, machinability, and scratch resistance may be deteriorated. Moreover, when the thickness of the thermoplastic resin back surface layer 8 is thicker than 300 μm, the suitability for lamination may be lowered.
This thermoplastic resin back layer 8 is made of amorphous crystalline polyester resin, amorphous polyester resin, biaxially stretched polyester resin, polypropylene homopolymer, propylene-ethylene random copolymer, propylene-ethylene block copolymer. It consists of a sheet | seat containing 1 type, or 2 or more types among polyester-type resin. The thermoplastic resin back layer 8 may be a single layer or a laminated structure in which a plurality of layers (sheets) are laminated.
For example, a wooden substrate 12 (see FIG. 2) described later is attached to the back surface 1b side of the thermoplastic resin substrate layer 1. The presence of the thermoplastic resin back surface layer 8 between the thermoplastic resin base material layer 1 and the wood base material can improve the adhesive strength between the thermoplastic resin base material layer 1 and the wood base material. it can. As an adhesive used for bonding the thermoplastic resin back layer 8 and the woody base material, for example, an ethylene-vinyl acetate copolymer emulsion-type adhesive can be used.

<Dampproof decorative board>
Next, the moisture-proof decorative board according to the embodiment of the present invention will be described.
FIG. 2 is a cross-sectional view illustrating a configuration example of the moisture-proof decorative board 20 according to the embodiment of the present invention.
As shown in FIG. 2, the moisture-proof decorative board 20 includes the above-described decorative sheet 10, the wooden substrate 12, and the moisture-proof sheet 14. For example, the decorative sheet 10 is provided on the one surface 12 a side of the wooden substrate 12, and the moisture-proof sheet 14 is provided on the other surface 12 b side of the wooden substrate 12. When the one surface 12a of the wooden substrate 12 is the front surface, the other surface 12b of the wooden substrate 12 is the back surface.

  A first adhesive layer 11 is provided between the wooden substrate 12 and the decorative sheet 10, and the wooden substrate 12 and the decorative sheet 10 are bonded to each other by the first adhesive layer 11. In addition, a second adhesive layer 13 is provided between the wooden substrate 12 and the moisture-proof sheet 14, and the wooden substrate 12 and the moisture-proof sheet 14 are bonded to each other by the second adhesive layer 13. A surface wettability modified portion in which the surface wettability is modified may be provided on the surface of the moisture-proof sheet 14 on the wooden substrate side. The surface wettability modified portion is formed by physical surface modification processing such as reactive ion etching (RIE) processing, for example. The second adhesive layer 13 includes an ethylene / vinyl acetate copolymer resin having a urethane bond.

Next, the wooden substrate 12, the moisture-proof sheet 14, the first adhesive layer 11, and the second adhesive layer 13 will be described more specifically.
(1) Wood base material The wood base material 12 is a plywood, a particle board, a medium density fiber board (MDF), or a hard board, for example. The thickness of the wooden substrate 12 is, for example, 1 mm or more and 50 mm or less.

(2) Moisture-proof sheet The moisture-proof sheet 14 is, for example, a base layer made of polyethylene terephthalate, a vapor deposition layer made of an inorganic oxide provided on one side of the base material layer, and a main component provided on the vapor deposition layer. Has a resin layer which is polyvinyl alcohol, and an adhesion primer layer provided on the resin layer. The other surface of the base material layer (that is, the surface opposite to the one surface) is a surface to be bonded to the wooden base material, and the surface wettability modifying portion may be provided on this surface.
Moreover, the moisture-proof sheet 14 may have transparency that allows the other surface side to be seen through from the one surface side. The moisture-proof sheet 14 may be colorless and transparent, or may be colored and transparent. Transparent refers to the degree of transparency that allows the back to be seen from the front.
Further, the water vapor permeability of the entire moisture-proof sheet 14 may be 1.0 g / m ² · day or less. The oxygen permeability of the entire moisture-proof sheet 14 may be 1.0 g / m ² · day or less. The moisture-proof sheet 14 may be a thermoplastic resin-based moisture-proof sheet.

(3) First and second adhesive layers The first adhesive layer 11 includes any type of adhesive such as a thermoplastic resin, a thermosetting resin, and a rubber (elastomer). These can be used by appropriately selecting known products or commercially available products.
Similarly to the first adhesive layer 11, the second adhesive layer 13 includes any type of adhesive such as a thermoplastic resin system, a thermosetting resin system, and a rubber (elastomer) system. The second adhesive layer 13 may include an ethylene / vinyl acetate copolymer resin (EVA) having a urethane bond. That is, the second adhesive layer 13 may be an EVA adhesive layer having a urethane bond.

<Building materials>
Next, the building material which concerns on embodiment of this invention is demonstrated.
FIGS. 3A and 3B are cross-sectional views showing a configuration example of the building materials 30 and 40 according to the embodiment of the present invention. As shown in FIG. 3A, the building material 30 includes the moisture-proof decorative board 20 and the core material 21 described above. In the building material 30, the moisture-proof sheet 14 side of the moisture-proof decorative board 20 is attached to one surface (for example, surface) 21 a side of the core material 21. The core material 21 is, for example, a wooden base material. This building material 30 can be used for flooring, for example.
As shown in FIG. 3B, the building material 40 also includes the moisture-proof decorative board 20 and the core material 21 described above. In the building material 40, the moisture-proof sheet 14 side of the moisture-proof decorative board 20 is attached to one side (for example, the front surface) 21a side and the other surface (for example, the back surface) 21b side of the core material 21, respectively. This building material 40 can be used for, for example, an indoor door, a kitchen door, a storage door, or a basket.

<Effect of embodiment>
According to the embodiment of the present invention, the thermoplastic resin back layer 8 is made of amorphous crystalline polyester resin, amorphous polyester resin, biaxially stretched polyester resin, polypropylene homopolymer, propylene-ethylene random copolymer. , A sheet containing at least one of propylene-ethylene block copolymer and polyester resin. And the thickness of the said sheet | seat which comprises this thermoplastic resin back surface layer 8 is 100 micrometers or more and 300 micrometers or less. Thereby, as shown in Examples 1-4 described later, a decorative sheet 10 having excellent impact resistance and caster resistance, and a moisture-proof decorative board 20 and building materials 30 and 40 using the decorative sheet 10 are provided. Can do.

The second surface protective layer 6 has a 60-degree specular gloss value of 20 or more and 35 or less in accordance with JIS Z 8741. Thus, there is provided a decorative sheet 10 having lightness of wiping at the time of cleaning and invisible wiping, and having excellent cleaning properties, and a moisture-proof decorative board 20 and building materials 30 and 40 provided with the decorative sheet 10 can do.
Since it has the above features, the decorative sheet 10 according to the present embodiment, the moisture-proof decorative board 20 and the building materials 30 and 40 including the decorative sheet 10 are suitable for flooring applications. In addition, the decorative sheet 10, the moisture-proof decorative board 20, and the building materials 30 and 40 are not limited to application to floor materials, but can be applied to building materials used around floor surfaces such as step boards for stairs. Further, as described with reference to FIG. 3B, the decorative sheet 10, the moisture-proof decorative board 20, and the building materials 30 and 40 are not limited to the application to the flooring and the building materials used in the surroundings, for example, It can also be applied to various building materials such as indoor doors, kitchen doors, storage doors, and baskets.

<Other configuration examples>
In the above embodiment, the case where the moisture-proof decorative board 20 is configured from the decorative sheet 10 shown in FIG. 1 has been described. However, in the present embodiment, the decorative sheet 10 may simply constitute a decorative board. For example, it is good also as a decorative board except the moisture-proof sheet | seat 14 from the moisture-proof decorative board 20 shown in FIG. Moreover, you may comprise a building material from this decorative board. Even if it is such a structure, the effect of said embodiment can be acquired.

EXAMPLES Hereinafter, the present invention will be described more specifically and in detail by examples, but the present invention is not limited only to these examples.
<Example 1>
A decorative sheet similar to that shown in FIG. 1 was prepared by the following material configuration and procedure.
(1) A polyethylene film (“FZ” manufactured by Riken Technos Co., Ltd.) was prepared as a thermoplastic resin substrate layer. On one side of the polyethylene film, a wood grain print was printed as a pattern layer with gravure ink (“Lamister” manufactured by Toyo Ink Manufacturing Co., Ltd.) by a gravure printing machine.

(2) Next, on the surface opposite to the surface on which the pattern layer of the thermoplastic resin base material layer is formed, the thickness after drying the two-component urethane primer resin containing silica powder is 1 μm. Gravure coating.
(3) Next, a two-component urethane resin adhesive having a polyester polyol as a main component and isophorone diisocyanate as a curing agent was applied onto the pattern layer so that the coating amount after drying was 2 g / m ² . .
(4) Next, a transparent adhesive layer (maleic acid-modified polypropylene resin) 10 μm and a transparent thermoplastic resin layer 80 μm whose main component is homopolypropylene (manufactured by Prime Polymer Co., Ltd.), the transparent adhesive layer is on the pattern layer side. Co-extrusion laminating was performed.

(5) Next, a thermosetting acrylic urethane resin (manufactured by DIC Graphics Co., Ltd.) was applied as a first surface protective layer on the surface of the transparent thermoplastic resin layer with a thickness of about 9 μm after drying.
(6) Next, an ultraviolet curable urethane acrylate resin (manufactured by DIC Graphics) and a thermosetting acrylic urethane resin (manufactured by DIC Graphics) are used as the second surface protective layer at a mass ratio of 6: The mixture was mixed at a mixing ratio of 4. And this mixed resin was coated so that the thickness after drying might be set to about 6 micrometers. Subsequently, the coated resin was cured by ultraviolet irradiation (high pressure mercury lamp, about 200 mJ / cm ² ) to obtain a decorative sheet intermediate.

(7) On the other hand, an amorphous crystalline polyester resin having a thickness of 200 μm is prepared, and a coating amount after drying a two-pack urethane resin adhesive (“TM-593” manufactured by Toyo Morton Co., Ltd.) Was applied so as to be 10 g / m ² . Thereby, a thermoplastic resin back layer was formed.
(8) Next, the thermoplastic resin base material layer side of the decorative sheet intermediate was dry-laminated on the surface of the thermoplastic resin back layer on which the two-component urethane resin adhesive was applied. This produced the decorative sheet which has a thermoplastic resin back surface layer.

<Example 2>
A decorative sheet of Example 2 was produced in the same manner as in Example 1 except that a polypropylene homopolymer was used for the thermoplastic resin back layer.
<Example 3>
A decorative sheet of Example 3 was produced in the same manner as in Example 1 except that a propylene-ethylene random copolymer was used for the thermoplastic resin back layer.
<Example 4>
A decorative sheet of Example 4 was produced in the same manner as in Example 1 except that the surface protective layer was not provided.

<Comparative Example 1: The thermoplastic resin back layer is thin>
A decorative sheet of Comparative Example 1 was produced in the same manner as in Example 1 except that the thickness of the thermoplastic resin back layer was 40 μm.
<Comparative Example 2: The thermoplastic resin back layer is thick>
A decorative sheet of Comparative Example 2 was produced in the same manner as in Example 1 except that the thickness of the thermoplastic resin back layer was 350 μm.

<Performance evaluation>
(1) Impact resistance test As an impact resistance test, a test was performed in accordance with the DuPont ball drop test (JIS K5400), and cracks in the flooring were visually observed. The case where the crack was not conspicuous was marked with ◎, the case where the crack was slightly visible was marked with ◯, and the case where the crack was large was marked with ×.
(2) Caster resistance test As a caster resistance test, a nylon double caster (diameter 40 mm, 1 wheel width 9 mm, 2 wheel width 18 mm) was loaded with a 25 kg weight (about 245 N), 10,000 The test piece was moved on the test piece at a speed of 20 cm / sec. The result was visually evaluated for dent marks. The case where the dent marks were not conspicuous was marked with ◎, the one where the dent marks were slightly visible was marked with ◯, and the one with large dent marks was marked with ×.

(3) Laminator suitability As laminator suitability, handling properties, kickback properties, and cutter properties (cutting with “Craft cutter” manufactured by Olfa Co., Ltd.) when continuously laminated were visually evaluated. Overall, good processing was marked with ◎, generally good with good, and poor processing with x.
(4) Machinability As the machinability, in the floor material production process, the degree of wear of the blade and the sheet cutting surface after using a machine such as a tenoner and a grooving router were visually evaluated. The blades are hardly worn away and the sheet cutting surface is good, ◎, the sheet cutting surface is slightly chipped and there is a cutting residue, ○, the blade is heavily worn or the chipped surface is severely chipped and cut The one with the rest was taken as x.
(5) Scratch resistance test A pencil scratch test (based on JIS-K5600 "Scratch hardness (pencil method)") was performed as a scratch resistance test, and the maximum hardness at which no scratches (including dent marks) remained on the surface was evaluated. B or more was marked with ◎, B less than 3B or more with ◯, and less than 3B with x.

<Evaluation results>
The results are shown in Table 1.

In each of the evaluation items, Examples 1 to 4 were evaluated as “◯” or more. That is, when a non-crystalline crystalline polyester resin having a thickness of 200 μm was used as the thermoplastic resin back layer (Examples 1 and 4), a polypropylene homopolymer having a thickness of 200 μm was used (Example 2). When a propylene-ethylene random copolymer having a thickness of 200 μm was used (Example 3), all the evaluation items showed good results.
On the other hand, when an amorphous crystalline polyester resin having a thickness of 40 μm is used as the thermoplastic resin back layer (Comparative Example 1), none of impact resistance, caster resistance, machinability, and scratch resistance are present. It was confirmed that it passed. In addition, in the case where an amorphous crystalline polyester resin having a thickness of 350 μm was used as the thermoplastic resin back layer (Comparative Example 2), it was confirmed that the laminator property and the machinability were rejected.

Comparing Comparative Examples 1 and 2, with the exception of machinability, it is the result of the counter electrode in each evaluation, and there is an inconvenience in certain performance if the thickness of the thermoplastic resin back layer is too thick or too thin. It has been shown that. Therefore, it was found that it is important to select an appropriate range for the thickness of the thermoplastic resin back layer.
Moreover, when Example 4 was compared with Comparative Example 1, Example 4 was evaluated as “◯” or more in spite of having no surface protective layer. From this, for impact resistance, caster resistance, machinability, and scratch resistance, selecting the thickness of the thermoplastic resin back layer within an appropriate range rather than the presence or absence of a surface protective layer greatly improves its performance. It turns out that it contributes.

When these results are put together, it can be seen that a decorative sheet excellent in impact resistance and caster resistance can be provided when the thickness of the thermoplastic resin back layer is 100 μm or more and 300 μm or less. In particular, when the thickness of the back surface layer of the thermoplastic resin is 200 μm, it seems that the balance of the entire evaluation is good.
From the above results, according to the present invention, it is possible to verify that it is possible to provide a decorative sheet excellent in impact resistance and caster resistance, and a moisture-proof decorative board, a building material, and a decorative board using the decorative sheet. did it.

  The moisture-proof decorative board and building material, decorative board and decorative sheet according to the present invention are extremely suitable for application to flooring materials such as houses, stores, offices, and gymnasiums, and can also be applied to other uses. It is.

DESCRIPTION OF SYMBOLS 1 Thermoplastic resin base material layer 2 Picture pattern layer 3 Transparent adhesive layer 4 Transparent thermoplastic resin layer 5 1st surface protective layer 6 2nd surface protective layer (outermost layer)
7 Surface Protective Layer 8 Thermoplastic Resin Back Layer 10 Decorative Sheet 11 First Adhesive Layer 12 Wood Substrate 13 Second Adhesive Layer 14 Moisture Proof Sheet 20 Moisture Proof Decorative Plate 21 Core Materials 30 and 40 Building Material

Claims (8)

A wooden substrate;
A decorative sheet provided on one side of the wooden substrate;
A moisture-proof sheet provided on the other surface side of the wooden substrate,
The decorative sheet is
A thermoplastic resin base material layer with the back surface facing the wooden base material;
A thermoplastic resin back layer provided on the back side of the thermoplastic resin substrate layer;
A pattern layer provided on the surface side of the thermoplastic resin substrate layer;
A transparent adhesive layer provided on the pattern layer;
A transparent thermoplastic resin layer provided on the transparent adhesive layer,
The thermoplastic resin back layer has a thickness of 100 μm or more and 300 μm or less, and an amorphous crystalline polyester resin, amorphous polyester resin, biaxially stretched polyester resin, polypropylene homopolymer, propylene-ethylene random copolymer. A moisture-proof decorative board comprising a sheet containing at least one of a polymer, a propylene-ethylene block copolymer, and a polyester resin. The decorative sheet is
A surface protective layer having a thickness of 3 μm or more and 50 μm or less and having at least one of an ionizing radiation curable resin and a thermosetting resin as a main component is provided on the surface side of the transparent thermoplastic resin layer. The moisture-proof decorative board according to claim 1.   The moisture-proof decorative board according to claim 2, wherein the outermost layer located at least on the outermost surface of the surface protective layer has a 60-degree specular gloss value of 20 or more and 35 or less in accordance with JIS Z 8741.   The outermost layer is mainly composed of a mixture of an ionizing radiation curable resin and a thermosetting resin, and contains a matting agent, and the content of the matting agent is less than 10% by mass. The moisture-proof decorative board according to claim 3.   The moisture-proof decorative board according to any one of claims 1 to 4, wherein the thermoplastic resin back layer includes silica powder.   A building material comprising the moisture-proof decorative board according to any one of claims 1 to 5. A wooden substrate;
A decorative sheet provided on one side of the wooden substrate,
The decorative sheet is
A thermoplastic resin base material layer with the back surface facing the wooden base material;
A thermoplastic resin back layer provided on the back side of the thermoplastic resin substrate layer;
A pattern layer provided on the surface side of the thermoplastic resin substrate layer;
A transparent adhesive layer provided on the pattern layer;
A transparent thermoplastic resin layer provided on the transparent adhesive layer,
The thermoplastic resin back layer has a thickness of 100 μm or more and 300 μm or less, and an amorphous crystalline polyester resin, amorphous polyester resin, biaxially stretched polyester resin, polypropylene homopolymer, propylene-ethylene random copolymer. A decorative board comprising a sheet containing at least one of a polymer, a propylene-ethylene block copolymer, and a polyester resin. A thermoplastic resin base layer;
A thermoplastic resin back layer provided on the back side of the thermoplastic resin substrate layer;
A pattern layer provided on the surface side of the thermoplastic resin substrate layer;
A transparent adhesive layer provided on the pattern layer;
A transparent thermoplastic resin layer provided on the transparent adhesive layer,
The thermoplastic resin back layer has a thickness of 100 μm or more and 300 μm or less, and an amorphous crystalline polyester resin, amorphous polyester resin, biaxially stretched polyester resin, polypropylene homopolymer, propylene-ethylene random copolymer. A decorative sheet comprising a sheet containing at least one of a polymer, a propylene-ethylene block copolymer, and a polyester resin.

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