JP3168391B2 - Floor material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flooring made of an olefin resin having excellent dry maintainability and adhesiveness.

[0002]

2. Description of the Related Art Conventionally, flooring made of vinyl chloride resin has been frequently used for flooring of buildings and condominiums.
However, a floor material made of a vinyl chloride resin generates a large amount of smoke containing harmful hydrogen chloride gas at the time of a fire, which has an adverse effect on the human body, and has a problem in that evacuation behavior and fire fighting activities are hindered. In addition, if dry maintenance is performed improperly on the floor with a high-speed buffing machine as a means of daily maintenance of the floor to which the floor material made of vinyl chloride resin is adhered, the surface gloss of the floor material will decrease and the surface will wear. However, there is also a problem that color change, scratches and swelling are generated.

[0003] For this reason, recently, floor materials containing an olefin resin containing no halogen as a base material and containing an inorganic filler have been actively studied, and among them, wear resistance and heat resistance are relatively good. Flooring materials based on natural polypropylene have been put to practical use. This polypropylene flooring
It is safe because it does not generate harmful gases such as hydrogen chloride in the event of a fire, and its surface gloss is slightly improved when polished with a buffing machine.There is little wear and no color change or blistering, so it can be said that it is suitable for dry maintenance. .

[0004]

However, although the floor gloss made of polypropylene is slightly improved by dry maintenance with a buffing machine as described above, the degree of the gloss improvement is not remarkable. Since scratch resistance and stain resistance are not so good, there is room for improvement in these points.

Further, since the floor material made of polypropylene is poor in adhesiveness, there is a fatal defect that even if the floor material is adhered to the floor with an adhesive, it is easily peeled off.

[0006] In order to improve the adhesiveness of the flooring made of polypropylene, it is conceivable to treat the backside of the flooring with a commercially available primer dedicated to polypropylene. However, the primer contains a solvent, and there is a problem of a fire problem or a deterioration of the working environment when the back surface of the floor material is treated at the time of manufacture or at the time of application. In addition, when the primer treatment is performed at the time of construction, there is a concern that the reliability of the adhesiveness is particularly poor. Therefore, such a primer treatment should not be adopted, and it is necessary to fundamentally improve the adhesion of the flooring material.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an olefin resin flooring material having both excellent dry maintenance and excellent adhesiveness.

[0008]

According to the present invention, there is provided a flooring material comprising: a surface layer in which an inorganic filler is blended with an olefin resin; an ethylene-vinyl acetate copolymer or the copolymer; It has a back surface layer in which an inorganic filler is mixed with a resin mixed with another olefin resin, and the ethylene-vinyl acetate copolymer of the back surface layer contains 35 to 75% by weight of vinyl acetate. Contains 1 to 10% by weight of wax and the back layer contains 1 to 10% by weight of rosin.

Preferably, low-molecular-weight polyethylene, an alicyclic saturated hydrocarbon resin, or a petroleum resin is used alone or as a mixture of two or more as the wax of the surface layer, and the content of the inorganic filler in the back layer is reduced. 50-85% by weight
Is set in the range.

[0010]

The flooring material of the present invention is suitable for dry maintenance because the resin of the surface layer is an olefin resin, and has little surface wear even when polished with a high-speed buffing machine, and does not cause color change or swelling. However, furthermore, this surface layer has 1 to
Since 10% by weight of wax is contained and the wax is exposed to the surface in a dispersed state, it has a glossy surface gloss. Even if the surface layer containing wax has a reduced surface gloss due to walking or the like, the surface is slightly worn when polished with a buffing machine, and a new polished surface in which the wax is dispersed is exposed. A glossy surface gloss can be restored. Therefore, the floor material of the present invention has excellent dry maintenance properties. Further, if the surface layer contains wax, the lubricity is improved, so that the scratch resistance, stain resistance, abrasion resistance, etc. are also improved.

It is necessary that the content of the wax in the surface layer is 1 to 10% by weight, and if it is less than 1% by weight, the surface gloss is not remarkably improved, and the scratch resistance, stain resistance, abrasion resistance, etc. Almost no improvement is seen. On the other hand, when the content is more than 10% by weight, the stain resistance is reduced again, and the mechanical properties, heat resistance and weather resistance are also reduced.

In the flooring material of the present invention, the ethylene-vinyl acetate copolymer in the back layer is an olefin resin having excellent adhesiveness, and the rosin contained in the back layer is ethylene-vinyl acetate copolymer. It has good compatibility with coalescence and good adhesion with inorganic fillers such as calcium carbonate and aluminum hydroxide. It exerts a reinforcing effect of suppressing weakening. For this reason, the addition of rosin increases the adhesive strength between the back layer and the adhesive. Therefore, various types of commercially available flooring adhesives (rubber-based, vinyl acetate-based, urethane-based) can be used without primer treatment. , An epoxy-based or acrylic-based adhesive). In particular, 35-75% of vinyl acetate
In the flooring material of the embodiment using the ethylene-vinyl acetate copolymer, the back surface layer is rich in flexibility and the amount of polar vinyl acetate is large, so that the adhesive strength is further improved.

The content of the inorganic filler in the back layer is correlated with the adhesive strength. If the back layer is not weakened, the higher the content of the inorganic filler, the higher the adhesive strength tends to be. In this respect, the content of the inorganic filler in the back layer is set to 5%.
The floor material of the embodiment in which the content is 0 to 85% by weight has a high content of the inorganic filler and the rosin reinforcing effect sufficiently suppresses the weakness of the back surface layer, and thus has excellent adhesive strength. However, if the content of the inorganic filler exceeds 85% by weight, it becomes difficult to suppress the weakening of the back surface layer even if rosin is contained, so that the adhesive strength is reduced.

The rosin content of the back layer is 1 to 10% by weight.
When the amount is less than 1% by weight, it is difficult to sufficiently suppress the weakening of the back surface layer, and it is difficult to substantially improve the adhesive force. On the other hand, even if it is contained in an amount of more than 10% by weight, the improvement of the adhesive strength is not recognized beyond a certain limit, and on the contrary, other physical properties such as reduction of tensile strength and instability of hue are adversely affected.

[0015]

Embodiments of the present invention will be described below.

FIG. 1 is a sectional view showing a most basic embodiment of a flooring material according to the present invention. The flooring material has a two-layer structure in which a surface layer 1 and a rear surface layer 2 are integrated. Is exemplified.

The surface layer 1 of this flooring is a layer in which an inorganic filler and a wax are uniformly mixed with an olefin resin.
Its thickness is about 1.0 to 5.0 mm, but is not particularly limited.

As the olefin resin for the surface layer 1, polypropylene or an ethylene-vinyl acetate copolymer is suitable, and it is desirable to use them by mixing them in a weight ratio of 7: 3 to 4: 6. When the mixing ratio of the polypropylene exceeds the above range, the surface layer 1 becomes hard and brittle, and when the mixing ratio is below the above range, the surface layer 1 becomes soft and the dent resistance and abrasion resistance decrease.

In particular, a mixture of polypropylene having a melt index of 1 to 10 and an ethylene-vinyl acetate copolymer containing 35% by weight or less of vinyl acetate at the above mixing ratio is extremely suitable as the resin for the surface layer 1. It is.
The former polypropylene has a good balance of properties such as hardness, impact strength and elongation, and the latter ethylene-vinyl acetate copolymer has low crystallinity and good processability and dimensional stability. Is used, it is possible to form the surface layer 1 having physical properties extremely suited to the flooring material.

Various olefin resins other than those described above, such as polyethylene, can be used as the resin for the surface layer 1.

The type of the inorganic filler to be contained in the surface layer 1 is not particularly limited, but powders of calcium carbonate and aluminum hydroxide are suitable, and fine powder having an average particle diameter of 10 μm or less and having good kneading properties is particularly preferable. Used for Since aluminum hydroxide powder is an excellent flame retardant that releases water by thermal decomposition, if it is mixed with calcium carbonate powder and contained in the surface layer 1, severe flame retardant, for example, as flooring for vehicles, is used. It is possible to obtain flooring materials that are required to have good properties.

The wax which is a characteristic component of the surface layer 1 is to be contained in the surface layer 1 in order to provide excellent dry maintenance properties and remarkably improve the surface gloss. As wax, low molecular weight polyethylene,
Any one of alicyclic saturated hydrocarbons and petroleum resins or a mixture of two or more thereof is used. _

When the wax is contained in the surface layer 1 as described above, the wax is exposed to the surface in a dispersed state, so that a glossy surface gloss is obtained. Even if the gloss of the surface layer 1 is reduced by walking or the like, the surface layer 1 is slightly worn by polishing the surface layer 1 with a buffing machine, and a new polished surface in which wax is dispersed is exposed. Surface gloss can be restored. Further, when the surface layer 1 contains wax, the lubricity is improved, so that the scratch resistance, stain resistance, abrasion resistance, etc. are also improved.

The wax content of the surface layer 1 is 1 to
It must be within the range of 10% by weight. If the wax content is less than 1% by weight, the surface gloss is not significantly improved even when the surface layer 1 is polished with a buffing machine, and the scratch resistance, stain resistance, abrasion resistance, etc. are hardly improved. Therefore, it is difficult to achieve the object of the present invention. On the other hand, if it exceeds 10% by weight, the stain resistance is reduced again, and the mechanical properties, heat resistance and weather resistance are disadvantageously reduced.
Again, it is difficult to obtain satisfactory flooring. A more preferred content of wax is in the range of 1 to 7% by weight.

The content of the olefin resin in the surface layer 1 is preferably in the range of 25 to 40% by weight.
It is desirable that the content of the inorganic filler be in the range of 57 to 72% by weight. If the amount of the olefin resin is less than 25% by weight and the amount of the inorganic filler is more than 72% by weight, the surface layer 1 becomes brittle and easily cracked, and the abrasion resistance is lowered. On the other hand, when the olefin resin is 4
When the amount of the inorganic filler is more than 0% by weight and the amount of the inorganic filler is less than 57%, there is a problem that the flame retardancy of the surface layer 1 is reduced and the surface layer 1 is easily burned.

Various additives such as a pigment, a peroxide-based crosslinking agent, a lubricant such as bisamide, a phenol-based antioxidant, and a benzophenone-based light stabilizer may be added to the surface layer 1 as necessary. You may make it contain. The content of additives is at most up to 1% by weight, usually less than 0.5% by weight.

The back surface layer 2 of this flooring is a layer in which an inorganic filler and rosin are uniformly blended with an ethylene-vinyl acetate copolymer or a mixed resin of the copolymer and another olefin resin. Its thickness is about 0.1 to 5 mm, but is not particularly limited.

As the ethylene-vinyl acetate copolymer for the back layer 2, one containing 35 to 75% by weight of vinyl acetate is particularly preferably used. The back layer 2 using such a copolymer is flexible and has a large amount of polar vinyl acetate. The copolymer has a suitable molecular length and is highly compatible with an adhesive, so that polyvinyl chloride or the like is used. The same or higher adhesive strength can be obtained. 35% by weight of vinyl acetate
A copolymer having less than 10% is one step in flexibility and adhesiveness, and a copolymer containing more than 75% by weight of vinyl acetate is not preferred because water resistance and alkali resistance are not good. When a copolymer containing a large amount of vinyl acetate and having poor water resistance and alkali resistance is used, it can be adjusted by mixing an appropriate amount of polyvinyl alcohol or the like.

When the resin of the back layer 2 is a mixed resin of an ethylene-vinyl acetate copolymer and another olefin resin, the ethylene-vinyl acetate copolymer is mixed at a ratio of at least 30% by weight or more. It is desirable to use a mixed resin that has been used. Ethylene-vinyl acetate copolymer is 3
If the mixed resin is used in an amount of less than 0% by weight, the back layer 2 becomes hard and brittle, resulting in a disadvantage that the adhesiveness is reduced.
As the other olefin-based resin mixed with the ethylene-vinyl acetate copolymer, for example, polypropylene or polyethylene is preferably used.

It is desirable that the resin content of the back surface layer 2 be in the range of 15 to 50% by weight. 15% by weight content
If the amount is less than 50%, the back layer 2 becomes brittle and the bonding strength is reduced. If the amount exceeds 50% by weight, the back layer 2 shrinks during molding due to too much resin, and the floor material may warp.

The inorganic filler contained in the back layer 2 is the same as the inorganic filler of the surface layer 1 described above. Aluminum powder is preferably used.

The content of the inorganic filler in the back layer 2 is 50 to 50%.
It is desirable to be in the range of 85% by weight. The content of the inorganic filler has a correlation with the adhesive strength. If the back layer 2 is not weakened, the adhesive strength of the back layer 2 tends to increase as the content increases. When the content of the inorganic filler is less than 50% by weight, it is difficult to say that the adhesive strength of the backside layer 2 is sufficient, and the backside layer 2 shrinks during molding due to too much resin, which may cause warpage of the floor material. Come. However, if the content of the inorganic filler is too high, the back surface layer 2 is weakened, so that the adhesive strength is reduced.

Therefore, the back layer 2 contains rosin as a characteristic component. This rosin has good compatibility with the ethylene-vinyl acetate copolymer and also has excellent adhesion to the inorganic filler, so that the inorganic filler is firmly held on the back layer to prevent the back layer 2 from becoming brittle. It functions as a reinforcing agent, and without this rosin, it is difficult to significantly improve both the adhesive strength and the mechanical strength of the back surface layer 2. When rosin is contained in the back layer 2, the mechanical strength of the back layer 2 is improved by its reinforcing effect, and the brittleness of the back layer 2 is suppressed even when the inorganic filler is contained up to 85% by weight as described above. Therefore, the adhesive strength can be greatly improved.

It is necessary that the rosin content is 1 to 10% by weight, and if it is less than 1% by weight, it is difficult to sufficiently suppress the weakness of the back surface layer 2, so that the adhesive strength can be substantially improved. It will be difficult. On the other hand, even if it is contained in an amount of more than 10% by weight, the improvement of the adhesive strength is not recognized beyond a certain limit,
On the contrary, other physical properties such as a decrease in tensile strength and instability of hue are adversely affected.

The back layer 2 may contain a small amount of various additives similar to those of the front layer 1.

The flooring material having the above structure is manufactured, for example, by the following method.

First, the olefin resin, the inorganic filler, the wax and, if necessary, the additives are blended in the above-mentioned blending ratio (content ratio), and the mixture is granulated by an extruder to form a powdery material for forming a surface layer. Get. On the other hand, an inorganic filler, rosin and, if necessary, an additive are blended in an ethylene-vinyl acetate copolymer or a mixed resin of the polymer and another olefin-based resin at the above-mentioned blending ratio (content). And sheeting with an extruder to obtain a sheet to be a back layer. Then, a powdery material for forming a surface layer is laminated on this sheet, gelled by heating, and pressed with a pressure roll or the like to form the surface layer integrally, thereby producing a two-layer floor material. You.

The flooring material illustrated in FIG. 1 is a two-layered flooring material in which a surface layer 1 and a backside layer 2 are laminated and integrated, and an intermediate layer is provided between the surface layer 1 and the backside layer 2 to form a three-layer structure. It is good also as a flooring material of a structure. In this case, the intermediate layer is preferably a layer (a layer containing neither wax nor rosin) in which an inorganic filler and an additive are added to the olefin resin as required, and the back layer 2 improves the adhesiveness. For this purpose, a thin layer of about 0.1 to 0.5 mm is preferable.

Next, more specific examples and comparative examples of the flooring material of the present invention will be described.

Example 1 14% by weight of polypropylene (melt index: 10), 14% by weight of ethylene-vinyl acetate copolymer (containing 15% by weight of vinyl acetate, melt index: 7), calcium carbonate powder (average) Alicyclic saturated hydrocarbon resin (Alcon P-140 manufactured by Arakawa Chemical Co., Ltd.)
1.7% by weight, heat stabilizer and light stabilizer 0.3% by weight
The resulting mixture was granulated with an extruder to obtain a powdery body for forming a surface layer (average particle size: about 0.5 mm).

On the other hand, the polypropylene was 11% by weight, the ethylene-vinyl acetate copolymer (containing 50% by weight of vinyl acetate, melt index 20) was 13.4 parts by weight, and the calcium carbonate powder was 73.1% by weight. Rosin, 2.4% by weight, antioxidant, light stabilizer and pigment at 0.
1% by weight, sheeting with extruder, thickness 2mm
Was obtained as a back layer.

Then, a powdery material for forming a surface layer is laminated on this sheet, and heated and pressed to form a surface layer having a thickness of 1 mm, which is cut into a tile of 450 × 450 mm. The flooring was made.

In order to judge whether the dry maintenance property of the floor material is good or not, the surface of the floor material is reduced to 15 by using a high-speed buffing machine (Cleanstar D-430 manufactured by Amano Corp.).
The surface layer was examined for color change, gloss, abrasion, and blistering when polished for 20 seconds, polished for 20 seconds, and polished for 30 seconds. The results are shown in Table 1 below.

Furthermore, the color change, gloss, abrasion, and presence or absence of swelling of each surface layer were examined when polishing was performed once for 20 seconds by a high-speed buffing machine, twice, and three times. . The results are shown in Table 2 below.

The gloss was measured by the method of JIS K 7105 (measurement of glossiness), and the presence or absence of color change, abrasion, and swelling was visually observed.

Further, in order to examine the scratch resistance of the flooring material, a first load of 2.5 kgf, a second load of 5.0 kgf, and a third load of 10 kgf were applied using a 0.5 mm-thick stainless steel plate edge. A scratch resistance test to make a scratch is performed, the depth of the scratch is measured, and JIS
It was stain resistance test according to the L 102 3. The results are shown in Table 3 below.

Example 2 Low molecular weight polyethylene as a wax (Mitsui High Wax manufactured by Mitsui Petrochemical Co., Ltd.)
A tile-like flooring material was produced in the same manner as in Example 1 except that the above-mentioned was used, and a polishing test, a scratch resistance test, and a stain resistance test were performed using the same high-speed buffing machine as in Example 1. The results are shown in Tables 1, 2 and 3 below.

Example 3 A tile-like flooring was produced in the same manner as in Example 1 except that a petroleum resin (Hyrets manufactured by Mitsui Petrochemical Co., Ltd.) was used as the wax.
Abrasion test, scratch resistance test,
A stain resistance test was performed. The results are shown in Tables 1 and 2 below.
It is shown in Table 3.

Example 4 14% by weight of high-density polyethylene (melt index: 7), 14% by weight of ethylene-vinyl acetate copolymer (containing 15% by weight of vinyl acetate, melt index: 7), calcium carbonate powder (Average particle size: 3 μm), 68.2% by weight, 3.5% by weight of low-molecular-weight polyethylene used in Example 2 as a wax, and 0.3% by weight of a heat stabilizer and a light stabilizer. Granulated and powdered material for forming surface layer (average particle size: about 0.5 mm)
I got

Then, a tile-like flooring material was produced in the same manner as in Example 1 except that the above-mentioned powder and granules were used instead of the powder and granules of Example 1, and the same high-speed buffing machine as in Example 1 was used. A polishing test, a scratch resistance test, and a stain resistance test were performed. The results are shown in Tables 1, 2 and 3 below.

Comparative Example 1 For comparison, powders for forming a surface layer without blending wax (polypropylene, ethylene-vinyl acetate copolymer, calcium carbonate, and additives were the same as in Example 1) ) Was granulated, and a tile-like flooring material was produced in the same manner as in Example 1 except that this non-waxed powdery granule was used instead of the powdery granule of Example 1.

Then, in the same manner as in Example 1, the color change, gloss, abrasion, and presence or absence of swelling when the surface layer was polished with a high-speed buffing machine were examined, and the same scratch resistance test and stain resistance test as in Example 1 were performed. went. The results are shown in Tables 1, 2 and 3 below.
Shown in

[Comparative Example 2] A polishing test, a scratch resistance test, and a stain resistance test were performed on a floor material made of a vinyl chloride resin using the same high-speed buffing machine as in Example 1. The results are shown in Tables 1, 2 and 3 below.

Comparative Example 3 A tile-like flooring material was produced in the same manner as in Example 1 except that the low-molecular-weight polyethylene used in Example 2 was added in an amount of 0.5% by weight as a wax. Then, a polishing test, a scratch resistance test, and a stain resistance test using the same high-speed buff machine as in Example 1 were performed. The results are shown in Tables 1, 2 and 3 below.

Comparative Example 4 A tile-like flooring material was prepared in the same manner as in Example 1 except that the low-molecular-weight polyethylene used in Example 2 was blended so as to be 12% by weight as a wax. A polishing test, a scratch resistance test, and a stain resistance test were performed using the same high-speed buffing machine as in Example 1. The results are shown in Tables 1, 2 and 3 below.

Comparative Example 5 A surface layer forming powder having the same composition as in Example 4 was granulated except that no wax was blended, and a tile-like flooring material was obtained in the same manner as in Example 4. Produced. Then, a polishing test, a scratch resistance test, and a stain resistance test using the same high-speed buffing machine as in Example 1 were performed on this floor material. The results are shown in Tables 1, 2 and 3 below.

[0057]

[Table 1]

[0058]

[Table 2]

[0059]

[Table 3]

From Tables 1 and 2, it can be seen that the floor materials of Examples 1 to 4 of the present invention in which the surface layer contains wax in the range of 1 to 10% by weight have a longer polishing time by a high-speed buffing machine. Also, the more times the polishing is repeated,
It can be seen that the gloss of the surface layer is significantly improved. The floor materials of Examples 1 to 4 have no color change, are not noticeably worn, and do not swell, and thus it can be seen that the dry maintenance property by the high-speed buffing machine is extremely good.

On the other hand, the floor materials of Comparative Examples 1 and 5 containing no wax in the surface layer and the floor material of Comparative Example 3 having a wax content of less than 1% by weight have longer polishing times with a high-speed buffing machine. The gloss of the surface layer increases as the number of repetitions of polishing increases, but the gloss increase rate is much lower than that of the flooring materials of Examples 1 to 4 of the present invention. It turns out that it is inferior to the flooring materials of Examples 1-4. On the other hand, the floor material made of the vinyl chloride resin of Comparative Example 2 has a longer polishing time by the high-speed buffing machine and a larger number of repetitions of the polishing.
Since the surface gloss is remarkably reduced and the color change, abrasion, swelling and the like are increased, it is found that the surface is not suitable for dry maintenance.

From Table 3, it can be seen that the flooring materials of Examples 1 to 4 of the present invention show that the flooring materials of Comparative Examples 1 and 5 containing no wax and the flooring material of Comparative Example 3 having a wax content of less than 1 wt% Scratch depth in the scratch resistance test is smaller than that of the floor material, and the result of the stain resistance test is also good. The scratch resistance and the stain resistance are almost the same as those of the vinyl chloride resin floor material of Comparative Example 2. It turns out that it has. Further, in the flooring material of Comparative Example 4 in which the wax contained 10% by weight or more in the surface layer, the surface gloss increased greatly as shown in Tables 1 and 2, but the stain resistance decreased as shown in Table 3. You can see that.

[Examples 5 to 12] Examples 5 to 12 in Table 4 below
Sheets each having a composition shown in FIG. 12 and having a thickness of 2 mm (sheets serving as backside layers) were each produced using an extruder. And
The powdery granules for forming the surface layer prepared in Example 1 were laminated on each sheet, and heated and pressed to form a surface layer having a thickness of 1 mm, which was cut and cut into a tile of 450 × 450 mm. Was prepared.

Each of the obtained flooring materials of Examples 5 to 12 was subjected to an adhesion test based on the test method of JIS K 6854, and the quality of the adhesion was evaluated. Table 4 shows the results.
Shown in

In Table 4, "EVA (VA: 60
%) "Is ethylene-containing 60% by weight of vinyl acetate.
A vinyl acetate copolymer, "EVA (VA: 20% by weight)" is an ethylene-vinyl acetate copolymer containing 20% by weight of vinyl acetate, "polypropylene" is a polypropylene having a melt index of 10, "Additive"
Is a heat stabilizer.

The evaluation of the adhesiveness in Table 4 indicates that those having the necessary strength as a flooring material for almost all commercially available flooring adhesives were regarded as “particularly good”, and some commercially available flooring adhesives were evaluated. A material that does not have the required strength as a flooring material is regarded as “good”, and some commercially available flooring adhesives do not have the required strength as a flooring material, and the safety factor is high. A low grade is considered "slightly good", and a grade that has the necessary strength as a flooring material only for some commercially available flooring grades is considered "slightly poor". Those that did not have the required strength as flooring were evaluated as "poor".

[Comparative Examples 6 to 8] For comparison, the following Table 4
A sheet having a composition shown in Comparative Examples 6 to 8 and having a thickness of 2 mm was produced by an extruder. Then, the powdery granules for forming the surface layer prepared in Example 1 were laminated on each sheet, and heated and pressed to form a surface layer having a thickness of 1 mm. A tile-like flooring was produced.

For each of the obtained flooring materials of Comparative Examples 6 to 8,
An adhesion test was performed in the same manner as in Examples 5 to 12, and the quality of the adhesion was evaluated. Table 4 shows the results.

[0069]

[Table 4]

Referring to Table 4, as the resin of the back surface layer, an ethylene-vinyl acetate copolymer or a mixed resin of the polymer and polypropylene was used, and the inorganic filler (calcium carbonate powder) and 1-10 All of the flooring materials of Examples 5 to 12 containing rosin in the range of% by weight were evaluated as “particularly good” or “good” by the adhesiveness test, indicating that they were excellent in adhesiveness. On the other hand, the flooring material of Comparative Example 6 containing no rosin was evaluated as “poor”, indicating that the rosin greatly contributed to the improvement of the adhesiveness.

The floor material of Comparative Example 8, in which the resin of the back layer was polypropylene alone containing no ethylene-vinyl acetate copolymer, was evaluated even if it contained rosin in the range of 1 to 10% by weight. "Somewhat bad". From this, it can be seen that in order to provide excellent adhesiveness, the resin of the back layer must contain an ethylene-vinyl acetate copolymer.

The evaluation of the flooring material of Comparative Example 7 containing a large amount of rosin of 15% by weight was “especially good”. However, the flooring material had a low tensile strength of the back surface layer and was unstable in color due to coloring by rosin. Is not preferred.

Next, when comparing the flooring materials of Examples 5, 6, 11 and 12 with the flooring materials of Examples 7 and 8, Example 5 containing 50 to 85% by weight of calcium carbonate powder was used. 6,
The evaluations of the flooring materials 11 and 12 were “especially good”, while the content of the calcium carbonate powder was as low as 40% by weight and the flooring material of Example 7 and the content of the calcium carbonate powder were 90%.
The judgment of the flooring material of Example 8 as large as% by weight is “good”. From this, in order to obtain better adhesion,
It can be seen that the content of the inorganic filler such as calcium carbonate may be set in the above range.

The flooring materials of Examples 6 and 12 and the flooring material of Example 9 both use a mixed resin of ethylene-vinyl acetate copolymer and polypropylene as the resin for the back layer. The floor materials of Examples 6 and 11 in which the mixing ratio of the ethylene-vinyl acetate copolymer was 30% or more were evaluated as “particularly good”, whereas the mixing ratio of the ethylene-vinyl acetate copolymer was about The evaluation of the flooring material of Example 9 which is as small as 20% is “good”. From this, when a mixed resin of ethylene-vinyl acetate copolymer and polypropylene is used as the resin for the back layer, it is advantageous to increase the mixing ratio of the copolymer to 30% or more in order to improve the adhesiveness. It turns out there is.

Further, when comparing the flooring materials of Examples 6 and 12 with the flooring materials of Examples 10 and 12, Examples 6 and 12 using a mixed resin of an ethylene-vinyl acetate copolymer containing 35% by weight or more of vinyl acetate and polypropylene. Of the flooring materials are rated "Especially good"
On the other hand, the evaluation of the flooring material of Example 10 using the mixed resin of the polypropylene containing the copolymer containing 20% by weight of vinyl acetate and polypropylene was “slightly good”. The floor materials of Examples 5 and 11 using solely an ethylene-vinyl acetate copolymer containing 35% by weight or more of vinyl acetate are evaluated as “particularly good”. From this, in order to remarkably improve the adhesiveness, it is necessary that the vinyl acetate content is 3
It is understood that the ethylene-vinyl acetate copolymer as high as 5% by weight or more may be used alone or in combination with another olefin resin.

[0076]

As is clear from the above description, since the flooring material of the present invention has both excellent dry maintenance properties and excellent adhesiveness, it is possible to use a commercially available adhesive without a primer treatment. It has a remarkable effect that it can be firmly adhered to the floor and can restore a glossy surface gloss every time it is polished with a high-speed buffing machine.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a flooring material of the present invention.

[Description of Signs] 1 front layer 2 back layer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-122275 (JP, A) JP-B-45-19781 (JP, B1) JP-T4-504384 (JP, A) (58) Investigated Field (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 E04F 15/00-15/22 EPAT (QUESTEL) WPI / L (QUESTEL)

Claims (3)

(57) [Claims] 1. An inorganic filler is blended in a surface layer in which an inorganic filler is blended in an olefin resin, and an ethylene-vinyl acetate copolymer or a mixed resin of the copolymer and another olefin resin. The back layer has an ethylene-vinyl acetate copolymer containing 35 to 75% by weight of vinyl acetate, the surface layer contains 1 to 10% by weight of a wax, and the back layer has A flooring material comprising 1 to 10% by weight of rosin. 2. The wax contained in the surface layer is one or a mixture of two or more of low molecular weight polyethylene, alicyclic saturated hydrocarbon resin, and petroleum resin.
Flooring. 3. The content of the inorganic filler in the back layer is 50 to 50.
The flooring material according to claim 1 or 2, which is 85% by weight.