JP2016156175A - Decorative material for floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative material for a floor having a stably moldable resin layer, by reducing warping and tearing-off, by stabilizing the thermal expansion of the resin layer of becoming a backer material even in the flow direction and even in the width direction.SOLUTION: A decorative material comprises a resin layer 15 including an organic filler formed of wooden powder or paper powder and a decorative sheet 3 formed on one surface of the resin layer 15, and the resin layer 15 is formed by blending a thermoplastic resin by 30 mass%-45 mass%, the organic filler by 10 mass%-30 mass% and an inorganic filler by 25 mass%-60 mass%, and a linear expansion coefficient is 6×10or less in both the flow direction and the width direction. The organic filler is also 50 μm-100 μm in an average of a minor axis in powder, and is 1:2 to 1:8 in the aspect ratio that is the ratio of a major axis of the powder to the minor axis.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a floor decorative material used for a floor or the like.

Currently, there are floor decorative materials laid on the floor of a building. The floor decorative material lays on the floor surface to give the floor surface a high design property, and gives the floor surface high impact resistance and caster resistance.
As flooring decorative materials, there are sheet flooring materials in which a decorative sheet is pasted on the surface of a woody base material such as plywood, medium density fiberboard (MDF), particle board, etc. It is possible to solve the problems that occur in the protruding plates, such that the color does not match between the plates, or the cost is high due to the expensiveness.

  However, in the sheet flooring material, there is a problem that the quality and the quality are not stable due to variations in the impact resistance and caster resistance of the wooden base material. In order to eliminate such problems, a backer material such as a polyethylene terephthalate film having a thickness of about 0.1 mm to 0.6 mm or a resin sheet containing an organic filler is bonded to the back surface of the sheet flooring material. Has been made. At present, sheet flooring materials having a specification using a wood powder-containing resin sheet using wood powder as an organic filler as a backer material are widely used.

  In a sheet flooring material using a wood powder-containing resin sheet as a backer material, it is known that the wood powder-containing resin sheet is thermally expanded and contracted. Thermal expansion and contraction of the wood powder-containing resin sheet may cause peeling or warping of the wood powder-containing resin sheet after the decorative sheet is bonded to the woody base material. Thermal expansion and contraction of the wood powder-containing resin sheet can be suppressed by adding cellulose such as wood powder and paper powder, and inorganic substances such as calcium carbonate, talc and mica. In addition, the sheet-like decorative sheet | seat which made the wood powder containing resin sheet which added the inorganic substance the backer material is described in patent document 1, for example.

JP 2009-297896 A

However, increasing the amount of filler added to the wood powder-containing resin sheet improves the peeling and the like of the wood powder-containing resin sheet, but improves the impact resistance and caster resistance, which are the original purposes, and in manufacturing This may affect the molding stability of Furthermore, since wood powder and paper powder are fibrous, the fibers are oriented in the flow direction when the backer material is extruded. The thermal expansion and contraction in the width direction of the backer material increases due to the orientation of the fibers.
The present invention has been made in view of the above points, and can stabilize the thermal expansion of the resin layer serving as the backer material in both the flow direction and the width direction, and reduce warping and peeling, and can be stably molded. An object is to provide a decorative material for floor.

In order to solve the above-mentioned problems, a flooring decorative material according to the present invention includes a resin layer containing an organic filler of a woody powder made of wood powder or paper powder, and a makeup formed on one surface of the resin layer. The resin layer has a thermoplastic resin content of 30% by mass to 45% by mass, the organic filler of 10% by mass to 30% by mass, and an inorganic filler of 25% by mass to 60% by mass. The linear expansion coefficient is 6 × 10 ⁻⁵ or less in both the flow direction and the width direction, and the organic filler has an average minor axis of 50 μm or more and 100 μm or less of the powder. The aspect ratio, which is the average ratio of the major axis, is from 1: 2 to 1: 8.

  According to the above-described invention, it is possible to provide a floor decorative material that can stabilize the thermal expansion of the resin layer serving as the backer material both in the flow direction and in the width direction, reduce warping and peeling, and can be stably molded. it can.

It is sectional drawing of the decorative material for floors of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described.
FIG. 1 is a diagram for explaining a floor decorative material according to the present embodiment.
The floor decorative material 1 includes a wood base 11, a resin layer 15 formed on one surface of the wood base 11 (the top surface of the wood base), and a wood base of the resin layer 15. 11, a decorative sheet 3 formed on the surface not in contact with the resin 11 (the upper surface of the resin layer 15), and a first adhesive layer 13 that bonds the wood-based substrate 11 and the resin layer 15. ing.

Hereinafter, each layer shown in FIG. 1 will be described.
(Woody base material)
As the woody base material 11 of the flooring decorative material 1 of the present embodiment, known materials such as South Sea wood plywood, softwood plywood, particle board, medium density fiber board, ordinary plywood stipulated in Japanese Agricultural Standard can be used. . In particular, a base material made of an olefin resin to which wood powder is added is suitable, but is not particularly limited thereto, and any material can be used as long as a decorative sheet 3 described later can be laminated to form a flooring decorative material. It may be something like this.
The thickness of the woody base material 11 is preferably about 3 to 25 mm.

(First adhesive layer)
The first adhesive layer 13 is appropriately provided in order to improve the adhesiveness when the wood base 11 and the resin layer 15 are laminated. Examples of the adhesive used for the first adhesive layer 13 include a known aqueous adhesive composed of a two-component urethane-modified vinyl resin, a one-component vinyl acetate resin emulsion-based adhesive, and a moisture-curable urethane resin-based hot-melt adhesive. Etc. can be used. A thermoplastic resin hot-melt adhesive can also be used. The weight of the coating after drying is preferably about 3 to ²⁰ g / m ² from the viewpoint of adhesiveness.

(Resin layer)
The resin layer 15 includes wood powder or paper powder described later, a thermoplastic resin serving as a binder for the wood powder or paper powder, and an inorganic filler. Wood powder or paper powder is a wood-based organic filler contained in order for the resin layer 15 to function as a backer material.
The thermoplastic resin of the resin layer 15 is preferably a polyolefin resin such as polypropylene. The resin layer 15 contains 30% by mass or more and 45% by mass or less of a thermoplastic resin such as a polyolefin resin.
Moreover, as an inorganic filler, scaly things, such as talc and mica, are more preferable than spherical things, such as a calcium carbonate.
Moreover, the resin layer 15 contains 10 to 30 mass% of wood powder or paper powder. Furthermore, the resin layer 15 contains 25 mass% or more and 60 mass% or less of an inorganic filler.

Furthermore, the resin layer 15 has a linear expansion coefficient of 6 × 10 ⁻⁵ or less in both the flow direction and the width direction. The “flow direction” is the direction in which the resin is extruded and flows when the resin layer 15 is molded (TD: Transverse Direction). The width direction is a direction orthogonal to the resin flow direction (MD: Machine Direction).
Further, the wood powder or paper powder contained in the resin layer 15 has an average minor axis in the powder of 50 μm or more and 100 μm or less, and an aspect ratio which is a ratio of an average major axis to an average minor axis is from 1: 2 to 1. : 8.
In addition, the said minor axis and major axis are the values defined by the geometric property of the well-known particle shape. In the method of determining the minor axis and the major axis of the powder according to geometric properties, a circumscribed rectangle in contact with the outer edge of the powder is defined, and the short side of the circumscribed rectangle is defined as the minor axis and the major side is defined as the major axis.

As wood flour, cutting wastes such as cedar and tsuga generated in a sawmill can be used. As the paper powder, virgin pulp, cut pieces in the paper making stage, processing loss in the processing stage, cutting out in the printing stage, and waste paper such as waste paper can be used. Considering the molding stability of wood powder or paper powder, the raw material of wood powder or paper powder is preferably limited to a certain variety.
When the particle size of the wood powder or paper powder exceeds 50 μm, a sea island pattern is generated between the wood powder or paper powder and the thermoplastic resin in the cross section of the resin layer 15. The sea-island pattern is visually unfavorable because it is visually recognized.
The thickness of the resin layer 15 is preferably 0.1 mm or more and 1.0 mm or less in consideration of the balance between cost and impact resistance.

[Decorative sheet]
The decorative sheet 3 includes a second adhesive layer 17, a sheet base material 19, a pattern layer 21, a third adhesive layer 23, a thermoplastic resin layer 25, and a surface protective layer 27.
The total thickness of the decorative sheet 3 is preferably 400 μm or less. By making it 400 μm or less, it becomes possible to manufacture the decorative sheet 3 with a continuous roll and wind it up in a bonded state, and then bond it to the resin layer 15 and the woody base material 11. .
Hereinafter, each layer described above will be described.

(Second adhesive layer)
The second adhesive layer 17 is appropriately provided for bonding the resin layer 15 and a sheet base material 19 described later. The adhesive used for the second adhesive layer 17 is not particularly limited as long as the object can be achieved, but a two-component urethane resin adhesive or the like can be used. The coating amount is preferably about 1 to 10 g / m ² after drying.

(Sheet base material)
The sheet base material 19 of this embodiment is made of a polyolefin resin. Specifically, for example, polypropylene, polyethylene, polybutene, polymethylpentene, polyisoprene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, propylene-α-olefin copolymer A polymer, an ethylene-ethylene acrylate copolymer, an acid-modified one of these for the purpose of improving adhesion, an ethylene-unsaturated carboxylic acid copolymer metal neutralized product (ionomer), or two or more of them It can be appropriately selected from various polyolefin-based resins such as a mixture and a copolymer, and a multi-layer laminate composed of the same or different polyolefin-based resins selected from these can also be used. .
Moreover, as the sheet | seat base material 19, what was colored in order to provide the concealment property with respect to a wood type base material to the decorative sheet 3 is used suitably. Coloring can be performed by appropriately adding a pigment such as isoindolinone, polyazo, phthalocyanine or the like to the polyolefin-based resin, but it is also possible to provide a solid print layer on the entire surface or the entire back surface by printing. The thickness of the sheet base material 19 is preferably 50 μm to 150 μm.

(Picture layer)
The pattern layer 21 is provided as appropriate in order to give a desired pattern design. The type of the desired pattern is not particularly limited, and can be arbitrarily determined, for example, wood grain pattern, stone pattern, cloth pattern, sand grain pattern, abstract pattern, geometric figure, character or symbol, or a combination thereof. .
The pattern layer 21 can be provided by printing with printing ink or the like. The type of printing ink or the like is not particularly limited.
Specific examples of the printing ink include binder resins such as cellulose, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, acrylic, polyurethane, polyester, epoxy, alkyd, and polyamine. In the present embodiment, the above printing ink is selected as appropriate from a single or each modified product. Further, the printing ink may be any of water-based, solvent-based, and emulsion types, and can be arbitrarily selected from a one-component type or a two-component type using a curing agent. Further, it is possible to cure the ink by irradiation with ultraviolet rays or electron beams. Among them, the most general method is a method of curing urethane-based ink with isocyanate.
Furthermore, the present embodiment includes organic or inorganic dyes or pigments contained in ordinary inks, and addition of moisture-resistant pigments, fillers, tackifiers, dispersants, antifoaming agents, stabilizers and other additives as necessary. Any conventionally known printing ink, which is prepared by appropriately adding an agent and adjusting to a desired viscosity with an appropriate dilution solvent, can be used.

(3rd adhesive layer)
The third adhesive layer 23 is provided as appropriate to bond the sheet base material 19 and the thermoplastic resin layer 25. The adhesive of the third adhesive layer 23 is not particularly limited as long as the purpose can be achieved, but a two-component urethane resin adhesive or the like can be used. The coating amount is preferably about 1 to 10 g / m ² after drying.

(Thermoplastic resin)
The thermoplastic resin layer 25 of the present embodiment is a transparent thermoplastic resin that is made of PBT. Specifically, PBT may be used alone for the thermoplastic resin 25, or an appropriate amount of a copolyester resin or an elastomer resin may be mixed. Furthermore, you may add a ultraviolet absorber and a light stabilizer suitably.
The thickness of the thermoplastic resin layer 25 is preferably 70 μm to 200 μm. Thereby, it becomes easy to wind up the decorative sheet 3 after printing and lamination, and has high surface strength such as scratch resistance and dent.

As a method of providing the thermoplastic resin layer 25, there is a method of providing it by melt extrusion molding. Melt extrusion molding is a method in which a pattern layer 21 is provided on a sheet base material 19 and then a sheet-like thermoplastic resin layer 25 is bonded to the upper surface via a third adhesive layer 23. However, this embodiment is not limited to what produces the thermoplastic resin layer 25 by melt extrusion molding.
Moreover, although not shown in figure, the embossing plate which consists of metal rolls etc. may be pressed on the surface of the thermoplastic resin layer 25, you may provide a recessed part, and you may embed a coloring agent in the recessed part. According to such processing, it is possible to express the feeling of shimmering on the wood.
Further, although not shown, a recess by embossing may be provided on the surface side of the thermoplastic resin layer 25, or a colorant may be embedded in the recess.

(Surface protective layer)
The surface protective layer 27 is provided as appropriate to impart various surface resistances. The surface protective layer 27 is coated with about 6 g / m ² to 15 g / m ^{2 of} a UV curable resin or a two-component urethane resin to which a known UV absorber, light stabilizer, glass beads, etc. are added in consideration of slipperiness. It is formed by doing. At this time, it is desirable that the surface hardness of the surface protective layer 27 be adjusted in consideration of the resilience of the impact resistance test and the caster resistance test.
Moreover, the floor decorative material 1 of this embodiment can be manufactured by the following method.

  First, the pattern layer 21 is provided on the surface of the appropriately colored sheet base material 19 by gravure printing or the like, the thermoplastic resin layer 25 on the front side, the resin layer 15 on the back side, the first adhesive layer 13 and the second adhesive, respectively. The adhesive layer 17 and the third adhesive layer 23 are bonded to the woody base material 11 or to each other. A surface protective layer 27 is provided on the surface by coating. However, this embodiment is not limited to what the flooring decorative material 1 is manufactured by such a method, and the sheet base material 19 and the resin layer 15 are transparent to make use of the texture of the wooden base material. A good resin may be used. In the present embodiment, the pattern layer 21 may be provided on the wooden base material 11, or the surface protective layer 27 may not be provided on the outermost surface.

The embodiment described above has the following effects.
That is, in the present embodiment, when the thermoplastic resin of the resin layer 15 is less than 30% by mass, the binder effect of the thermoplastic resin is weakened and becomes brittle during molding, and may be broken when pulled after extrusion molding. Further, when the thermoplastic resin is added in an amount of more than 45% by mass, the linear expansion coefficient of the resin layer 15 becomes larger than 6 × 10 ⁻⁵ , and the resin layer 15 warps due to expansion and contraction after being bonded to the woody base material 11. Or may peel from the woody base material 11.
Therefore, in the present embodiment, the decorative resin 1 for flooring that has good moldability and does not warp or peel off the resin layer 15 by setting the thermoplastic resin of the resin layer 15 to 30% by mass or more and 45% by mass or less. Can be provided.

Moreover, in this embodiment, when wood powder or paper powder is less than 10% by mass of the resin layer, the linear expansion coefficient in the flow direction becomes larger than 6 × 10 ⁻⁵ , and after bonding with the woody base material 11 Due to the expansion and contraction, the resin layer 15 may be warped or peeled off from the wooden substrate 11. Moreover, when there are more wood powder or paper powders than 30 mass% of a resin layer, it will become weak at the time of shaping | molding, and when it pulls after extrusion molding, it may be shredded.
Therefore, in this embodiment, the wood powder or paper powder of the resin layer 15 is 10% by mass or more and 30% by mass or less of the resin layer, so that the formability is good and the floor decorative material does not warp or peel off. 1 can be provided.

Moreover, in this embodiment, when the inorganic filler is less than 25% by mass of the resin layer 15, the linear expansion coefficient becomes larger than 6 × 10 ⁻⁵ , and the resin expands and contracts after being bonded to the wooden substrate 11. The layer 15 may be warped or peeled off from the wooden substrate 11. Moreover, when there are more inorganic fillers than 60 mass%, it will become weak at the time of shaping | molding, and when it is pulled after extrusion molding, it may be broken.
Therefore, this embodiment provides the floor decorative material 1 with good moldability and no warping or peeling by setting the inorganic filler to 25% by mass or more and 60% by mass or less of the resin layer 15. Can do.

Moreover, in this embodiment, when the minor axis of the average particle diameter of wood powder or paper powder is small, the linear expansion coefficient in the width direction becomes larger than 6 × 10 ⁻⁵ , and after bonding with the woody base material 11 Due to the expansion and contraction, the resin layer 15 may be warped or peeled off from the wooden substrate 11.
Therefore, the present embodiment provides the floor decorative material 1 having good moldability and no warping or peeling by setting the average particle size of the wood powder or paper powder to a minor axis of 50 μm or more and a major axis of 100 μm or less. can do.
In this embodiment, if the major axis is long in the aspect ratio of the wood powder or paper powder contained in the resin layer 15, the wood powder or paper powder is not sufficiently dispersed and kneaded during the extrusion molding, and is secondarily aggregated. At this time, the resin layer 15 becomes brittle at the time of molding, and may be broken when pulled after extrusion molding.
Therefore, this embodiment can provide the floor decorative material 1 with good moldability by setting the aspect ratio of wood powder or paper powder to 1: 2 to 1: 8.

Moreover, in this embodiment, when the linear expansion coefficient of the resin layer 15 is larger than 6 × 10 ⁻⁵ , the resin layer 15 warps due to expansion and contraction after being bonded to the wooden base material 11, or the wooden base material 11. May peel off.
Therefore, this embodiment can provide the floor decorative material 1 with good moldability by setting the linear expansion coefficient of the resin layer 15 to 6 × 10 ⁻⁵ or less in both the flow direction and the width direction.
In this embodiment, if the thickness of the resin layer 15 is less than 0.1 mm, the effect of improving impact resistance and caster resistance is lowered. On the other hand, if the thickness of the resin layer 15 is more than 1 mm, it is difficult to wind the resin layer 15 on a roll and the cost is increased.
Therefore, in the present embodiment, the thickness of the resin layer 15 is set to 0.1 mm or more and 1.0 mm or less, so that the impact resistance and caster resistance are high, the handling is easy in the manufacturing process, and the cost is low. Material 1 can be provided.

The embodiment described above exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is based on the material, shape, structure, arrangement, etc. of the component parts. It is not specific to the above. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.
It should be noted that the drawings described in the present embodiment are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description.

Example 1
In Example 1, 35 mass% of commercially available homopolypropylene resin (primary polymer E2000GV: product name), 15 mass of paper powder obtained by pulverizing virgin paper to a short diameter of 80 μm and an aspect ratio of 1: 4 using a ball mill. %, 47% by mass of talc having an average particle size of 5 μm and 3% by mass of calcium stearate were mixed and extruded by a twin screw extruder to form a plate-like layer having a thickness of 0.5 mm and a width of 450 mm. And the corona discharge process was performed to the front and back of the shape | molded plate-shaped layer, and the resin layer containing paper dust was obtained.
Further, in Example 1, 50 μm of PUR adhesive (DIC Tyforce FH315: product name) was applied to the surface side of the resin layer, and a decorative sheet having a thickness of 160 μm was adhered. Also, a vinyl acetate adhesive 30 μm was applied to the back side of the resin layer, and a lauan ordinary plywood having a thickness of 12 mm was bonded to obtain a flooring decorative material.
Results of the measurement of the linear expansion coefficient of the resin layer of Example 1, 4 × 10 -5 in the flow direction ^was 5 × 10 ^-5 in the width direction.

(Example 2)
In Example 2, the condition of Example 1 was changed only to the conditions of the short diameter and aspect ratio of the paper powder contained in the resin layer, and a flooring decorative material was produced. The minor axis of the paper powder of the floor decorative material of Example 2 is 100 μm, and the aspect ratio which is the ratio of the minor axis to the major axis is 1: 2.
(Example 3)
In Example 3, the condition of Example 1 was changed only to the conditions of the short diameter and aspect ratio of the paper powder contained in the resin layer, and a flooring decorative material was produced. The minor axis of the paper powder of the floor decorative material of Example 2 is 50 μm, and the aspect ratio which is the ratio of the minor axis to the major axis is 1: 8.
In addition, all the production conditions of the floor decorative material of Example 1- Example 3 are in agreement with the conditions of Claim 1 of this invention.

The inventors of the present invention further produced a floor decorative material of a comparative example compared with the floor decorative material of the above example. And the floor decorative material of the said Example and the floor decorative material of the comparative example were compared, and the floor decorative material of the Example was evaluated.
(Comparative Example 1)
In Comparative Example 1, a floor decorative material was produced by changing the conditions of Example 1 only for the condition of the short diameter and aspect ratio of the paper powder contained in the resin layer. The minor axis of the paper powder of the floor decorative material of Comparative Example 1 is 100 μm, and the aspect ratio which is the ratio of the minor axis to the major axis is 1: 1.5.

(Comparative Example 2)
In Comparative Example 2, a floor decorative material was prepared by changing the conditions of Example 1 only for the conditions of the short diameter and aspect ratio of the paper powder contained in the resin layer. The minor axis of the paper powder of the floor decorative material of Comparative Example 1 is 100 μm, and the aspect ratio which is the ratio of the minor axis to the major axis is 1: 9.
(Comparative Example 3)
In Comparative Example 3, a flooring decorative material was produced by changing the conditions of Example 1 only for the conditions of the short diameter and aspect ratio of the paper powder contained in the resin layer. The minor axis of the paper powder of the decorative material for floor of Comparative Example 3 is 50 μm, and the aspect ratio which is the ratio of the minor axis to the major axis is 1: 1.5.
(Comparative Example 4)
In Comparative Example 4, a floor decorative material was prepared by changing the conditions of Example 1 only for the conditions of the short diameter and aspect ratio of the paper powder contained in the resin layer. The minor axis of the paper powder of the floor decorative material of Comparative Example 3 is 50 μm, and the aspect ratio which is the ratio of the minor axis to the major axis is 1: 9.

In addition, the production conditions of the decorative materials for floors of Comparative Examples 1 to 4 are all out of the conditions of Claim 1 of the present invention in the aspect ratio of the paper powder.
Comparative Example 1 is the same as Example 2 except for the aspect ratio of paper dust, and the ratio of the major axis to the minor axis is smaller than the range described in claim 1. Comparative Example 2 is the same as Example 2 except for the aspect ratio of paper dust, and the ratio of the major axis to the minor axis is larger than the range described in claim 1.
Comparative Example 3 is the same as Example 3 except for the aspect ratio of paper dust, and the ratio of the major axis to the minor axis is smaller than the range described in claim 1. Comparative Example 4 is the same as Example 3 except for the aspect ratio of paper dust, and the ratio of the major axis to the minor axis is larger than the range described in claim 1.

(Evaluation)
The inventors of the present invention evaluated the linear expansion coefficients of the above-described Examples 1 to 3 and Comparative Examples 1 to 4. Evaluation of the linear expansion coefficient was performed by calculating the linear expansion coefficient in a temperature range of 0 ° C. to 40 ° C. using a thermomechanical analyzer TMA (product name). And the calculated linear expansion coefficient was evaluated by "(circle)", "(triangle | delta)", and "x". The criteria for each evaluation are as follows.
◯: 6 × 10 ⁻⁵ or less Δ: 6 × 10 ⁻⁵ to less than 10 × 10 ⁻⁵ ×: 10 × 10 ⁻⁵ or more

In addition, the inventors of the present invention evaluated the formability of the above-described Examples 1 to 3 and Comparative Examples 1 to 4. The moldability was evaluated by mixing the resin layer with a twin screw extruder and confirming the ease of molding when extrusion molding was performed. The moldability was evaluated by “◯”, “Δ”, and “×”. The criteria for each evaluation are as follows.
○: Good moldability △: Slightly difficult to mold stability, lack of dimensional stability, etc. ×: Not moldable

Table 1 is a diagram collectively showing the evaluations of Examples 1 to 1 and Comparative Examples 1 to 4. As shown in Table 1, the floor decorative material produced in Example 1 obtained a good evaluation of “◯” for both the linear expansion coefficient and the moldability. Further, the floor decorative material produced in Example 2 obtained an evaluation of “◯” for the linear expansion coefficient, but obtained an evaluation of “◯” to “Δ” for the moldability. Such evaluation shows that the moldability of the floor decorative material of Example 2 is not stable with respect to the floor decorative material of Example 1.
Moreover, although the decorative material for floors produced in Example 3 obtained evaluation of "(circle)" about the moldability, evaluation of "(circle)"-"(triangle | delta)" was obtained about the linear expansion coefficient. Such an evaluation shows that the linear expansion coefficient of the floor decorative material of Example 3 is not stable with respect to the floor decorative material of Example 1.

Further, according to Table 1, it can be seen that for Comparative Example 1 in which the aspect ratio is outside the range described in claim 1, a good evaluation of “◯” was obtained for the linear expansion coefficient in the width direction. However, for the linear expansion coefficient and moldability in the flow direction of Comparative Example 1, an evaluation of “Δ” was obtained. From such an evaluation, the floor decorative material produced under the conditions of Comparative Example 1 has a linear expansion coefficient and moldability in the flow direction as compared with Example 2 because the aspect ratio of the major axis to the minor axis of the paper powder is small. It is thought that it became low.
Moreover, about Comparative Example 2, it turns out that favorable evaluation of "(circle)" was obtained about the linear expansion coefficient. However, the moldability of Comparative Example 2 was evaluated as low as “×”. From such an evaluation, the floor decorative material produced under the conditions of Comparative Example 2 has a larger linearity coefficient and moldability in the flow direction than Example 2 because the aspect ratio of the major axis to the minor axis of the paper powder is large. It is thought that it became low.

Table 1 also shows that Comparative Example 3 was evaluated as “Δ” for the linear expansion coefficient in the flow direction and “×” for the linear expansion coefficient in the width direction. About the moldability of the comparative example 3, low evaluation of "x" was obtained. From such an evaluation, the floor decorative material produced under the conditions of Comparative Example 3 is considered to have obtained a lower overall evaluation than Example 3 because the aspect ratio of the major axis to the minor axis of the paper powder is small. It is done.
Furthermore, regarding Comparative Example 4, it can be seen that a good evaluation of “◯” was obtained for the linear expansion coefficient in the flow direction. However, the comparative example 4 obtained a low evaluation of “Δ” for the linear expansion coefficient in the width direction and “x” for the moldability. From such an evaluation, the floor decorative material produced under the conditions of Comparative Example 4 has a greater linear expansion coefficient and moldability in the width direction than Example 3 because the aspect ratio of the major axis to the minor axis of the paper powder is large. It is thought that it became low.

  In Examples 1 to 3 and Comparative Examples 1 to 4, all are 35% by mass of homopolypropylene resin as a thermoplastic resin, 47% by mass of talc having an average particle diameter of 5 μm as an inorganic filler, and steer. A resin layer is prepared using 3% by mass of calcium phosphate. The inventors of the present invention also conducted the same experiment on a resin layer containing a thermoplastic resin in an amount of 30% by mass or more and 45% by mass or less and the boundary thereof, and the same results as those shown in Table 1 were obtained. The result was obtained. The inventors of the present invention also conducted the same experiment on the resin layer containing the inorganic filler in the range of 25% by mass or more and 60% by mass or less and the boundary thereof, and those shown in Table 1 Similar results were obtained.

  The present invention described above can be applied to floor decorative materials in general.

DESCRIPTION OF SYMBOLS 1 Floor decorative material 3 Cosmetic sheet 11 Wood type base material 13 1st adhesive layer 17 2nd adhesive layer 15 Resin layer 19 Sheet base material 21 Picture layer 23 3rd adhesive layer 25 Thermoplastic resin 27 Surface protective layer

Claims (2)

A resin layer containing an organic filler of woody powder made of wood powder or paper powder,
A decorative sheet formed on one surface of the resin layer,
The resin layer is composed of 30 to 45% by mass of a thermoplastic resin, 10 to 30% by mass of the organic filler, and 25 to 60% by mass of an inorganic filler, The linear expansion coefficient is 6 × 10 ⁻⁵ or less in both the flow direction and the width direction,
The organic filler has an average minor axis in the powder of 50 μm or more and 100 μm or less, and an aspect ratio that is a ratio of an average of the major axis of the powder to the average of the minor axis is 1: 2 to 1: 8. A decorative material for floors.   The floor decorative material according to claim 1, wherein the resin layer has a thickness of 0.1 mm or more and 1.0 mm or less.

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