JP5284399B2 - Artificial grass - Google Patents

Description

  The present invention relates to an artificial lawn in which pile yarns are inserted into a base fabric to form leaf axes.

A backing adhesive for bonding and fixing the back stitch of the pile yarn to the base fabric is applied to the back surface of the artificial lawn raw fabric in which the pile yarn is inserted into the base fabric to form the leaf shaft.
The backing adhesive includes polyacrylate emulsion, vinyl acetate / ethylene copolymer emulsion, styrene / acrylate emulsion, styrene / butadiene copolymer latex, acrylonitrile / butadiene copolymer latex, carboxyl-modified styrene / butadiene. Synthetic resin emulsions and latex compounds such as copolymer latex are used.
The backing adhesive includes calcium carbonate (CaCO ₃ ), calcium sulfate (CaSO ₄ .2H ₂ O), calcium sulfite, calcium hydroxide (Ca (OH) ₂ ), basic magnesium carbonate (3MgCO ₃ .Mg (OH ) ₂ · 3H ₂ O to 4MgCO ₃ · Mg (OH) ₂ · 4H ₂ O), magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al ₂ O ₃ · 3H ₂ O), aluminum silicate ( Al ₂ (SiO ₃ ) ₃ ), magnesium silicate (MgSiO ₃ , Mg ₂ SiO ₄ ), calcium silicate (CaSiO ₃ ), kaolin clay (natural aluminum silicate; Al ₂ O ₃ .2SiO ₂ .2H ₂ O) , talc (magnesium natural _{silicate; Mg 3 SiO 10 (OH)} 2), mica (muscovite, _{muscovite; K 2 Al 4 (Si 3} Al) 2 O 20 (OH) 4, _{Mica-phlogopite; K 2 Mg 6 (Si 3} Al) 2 O 20 (OH) 4), sepiolite _{(Mg 8 Si 12 O 30 (} OH) 4 (OH 2) 4 · 8H 2 O), zonolite (6CaO · 6SiO ₂ · H ₂ O), potassium titanate (K ₂ O · (TiO ₂ ) _n ), attapulgite (5MgO · 8SiO ₂ · 9H ₂ O) and the like are blended.

A filament tape yarn or a filament split yarn having a fineness of 100 to 20000 dtex is used for the pile yarn of the artificial lawn (Patent Document 1).
The filament tape yarn is formed by twisting a plurality of filament tapes having a flat cross-sectional shape, and the thickness of each filament tape is generally 20 to 400 μm and the width is generally 1 to 3 mm.
The thickness of the filament split yarn is generally 20 to 400 μm like the filament tape, but the width of the filament split yarn is as wide as the sum of the widths of a plurality of filament tapes as in the case of a strip film.
The filament split yarn has the appearance that it is divided into a plurality of filament tapes by slits made on the wide film, but the slits are not endless but are separated by slits and adjacent filament tapes. The filament tape is partially connected to form a net.

  In such a filament split yarn, the adjacent filament tapes are partially connected to each other and have convergence properties. Therefore, as shown in FIG. 1, the artificial lawn in which the pile length h of the leaf shaft 22 is less than 20 mm. When applied to No. 20, the need for twisting and binding as in the case of filament tape yarns is not required, and the filament split yarn is advantageous in terms of cost compared to the filament tape yarn.

JP 2010-248802 A

When the filament split yarn is used for an artificial lawn 30 having a pile length h of 30 mm or more used for a soccer field, a futsal field, etc., the individual leaf axes are shown in FIG. 2 because the pile length h is long. 32 a, 32 b, 32 c ...... collapses together, and a plurality of adjacent leaf axes 32 a, 32 b, 32 c,..., Each tip 33 a, 33 b, 33 c,. The tips 33a, 33b, 33c, ... of 32b, 32c ......... are not evenly dispersed, and the ground surface on which the artificial lawn 30 is constructed vary in appearance and the appearance of the artificial lawn 30. Becomes poor.
Therefore, when constructing an artificial lawn with a pile length of 30 mm or more, the filament tape yarn is not substantially twisted and set so that the tips of the leaf axes are evenly distributed. Attempts have been made to use the pile yarn in a non-twisted state.

However, a plurality of leaf shafts planted in a non-twisted state are aligned at the root, and in particular, in a non-crimped filament tape yarn made of a polyolefin resin having a low polarity and lacking adhesion, Since the length is 30 mm or more and it is easy to pull, individual leaf shafts are easily pulled out from the base fabric, and a durable artificial lawn that can withstand intense competition cannot be obtained.
As such, the non-crimped filament tape yarn made of polyolefin resin, although having low polarity and lacking adhesiveness, has low frictional resistance and less frictional heat generated by sliding during competitions. There is a strong demand for artificial grass.

  Therefore, an object of the present invention is to obtain a durable artificial lawn using a filament tape yarn of uncrimped polyolefin resin as a leaf shaft.

The artificial lawn according to the present invention comprises: (a) a back surface of an artificial lawn fabric having a pile length h of 30 mm or more formed by inserting pile yarn into the base fabric 11 and applying a backing adhesive to the back side. In an artificial lawn constructed by adhering and fixing back stitches of pile yarn intervening on the base fabric 11,
(B) The pile yarn is composed of a plurality of crimped polyolefin monofilaments without crimping,
(C) Each monofilament constituting the pile yarn has a flat cross-sectional shape having a single fiber fineness of 200 dtex or more, a thickness t of 100 μm or more and a width w of at least twice the thickness t,
(D) The first feature of the adhesive for lining is that the self-crosslinking type carboxyl-modified styrene / butadiene copolymer is used as a resin component and diphenylmethane diisocyanate is blended.

  A second feature of the artificial lawn according to the present invention is that, in addition to the first feature, the blending amount of the diphenylmethane diisocyanate is 10 parts by weight with respect to 100 parts by weight of the carboxyl-modified styrene-butadiene copolymer. More than 80 parts by weight.

  A third feature of the artificial lawn according to the present invention is that, in addition to any of the first and second features, a filler is blended in the backing adhesive, and the blending amount of the filler is: The amount is from 50 parts by weight to 200 parts by weight with respect to 100 parts by weight of the carboxyl-modified styrene / butadiene copolymer.

  According to a fourth feature of the artificial lawn of the present invention, in addition to any of the first, second and third features, the monofilament has a single fiber fineness of 1000 dtex or more and a thickness t of 200 μm or more. There is a point.

  According to a fifth feature of the artificial lawn of the present invention, in addition to any of the first, second, third, and fourth features, the monofilament is made of polypropylene resin or polyethylene resin, The total fineness is 5000 dtex or more.

The sixth feature of the artificial lawn according to the present invention is that, in addition to any of the first, second, third, fourth and fifth features, the backing adhesive has a dry coating amount of 600 g / m is ² or more 1000 g / m ² to at which point or less.

  The seventh feature of the artificial lawn according to the present invention is formed on the surface of the base cloth 11 in addition to any of the first, second, third, fourth, fifth and sixth features. A granule is packed between the leaf shaft 12 and the leaf shaft 12, and the leaf shaft 12 is used in an upright state by the granule.

  In the artificial lawn according to the present invention, a self-crosslinking type carboxyl-modified styrene / butadiene copolymer is used as a resin component, and the crosslinkability of the carboxyl-modified styrene / butadiene copolymer is improved by adding diphenylmethane diisocyanate, The carboxyl-modified styrene / butadiene copolymer is self-crosslinked with diphenylmethane diisocyanate to increase the tackiness and improve the water resistance. Even if it gets wet in the rain, it does not lower the leaf pulling strength.

  In the present invention, the blended weight part of diphenylmethane diisocyanate is not less than 10 parts by weight and not more than 80 parts by weight with respect to 100 parts by weight of the carboxyl-modified styrene / butadiene copolymer. Sufficient usable time can be secured without causing any trouble.

  In the present invention, 50 parts by weight or more and 200 parts by weight or less of a filler is blended with respect to 100 parts by weight of the carboxyl-modified styrene / butadiene copolymer. As a result, the amount of backing adhesive can be increased and the cost can be reduced, and the strength and durability of the backing adhesive can be improved.

  In the artificial lawn according to the present invention, the monofilament has a single fiber fineness of 1000 dtex or more and a flat cross-sectional thickness of 200 μm or more, or the monofilament is made of polypropylene resin or polyethylene resin, and the total fineness of the pile yarn is 5000 dtex or more. By doing so, it becomes possible to secure the width of the monofilament between 0.5 mm and 6 mm, and even if the user slips during the competition and frictional heat is generated, it is difficult to cut the leaf axis of the artificial lawn .

The artificial lawn according to the present invention is suitable for firmly bonding and fixing the back stitch of the pile yarn to the base fabric by setting the dry coating amount of the backing adhesive to 400 g / m ² or more and 1000 g / m ² or less. An amount of backing adhesive can be applied.

  The artificial lawn according to the present invention is packed with granules between the leaf shafts formed on the surface of the base fabric, and the leaf shafts are kept upright by the granules, so that the texture is close to natural grass. It is easy to reproduce the hair and feet, making it easier to construct an artificial lawn.

It is a perspective view of an artificial lawn to which a filament split yarn having a pile length of less than 20 mm is applied. It is a perspective view of an artificial lawn to which a filament split yarn having a pile length of 30 mm or more is applied. 1 is a perspective view of an artificial lawn according to the present invention.

  Polyolefin-based monofilaments are used for the leaf shaft 12 because, as described at the beginning, the polarity is low, the frictional resistance is small, and the frictional heat generated by sliding during the competition is small, so that when the athlete slides, there is a burn. This is to make it difficult to bear.

The reason why the pile length h of the leaf shaft 12 is set to 30 mm or more is that, in competitions such as soccer and futsal, the speed at which the ball rolls varies depending on the pile length h. This is because it is not only preferred by the rider, but also makes it difficult for the athlete to be injured when sliding.
Even if the pile length h of the natural grass leaf height is set to 30 mm or more, the pile length h is generally limited to 120 mm.

The thickness t of the monofilament is set to 100 μm or more. If the thickness t is less than 100 μm, when the athlete uses the artificial grass 10 for soccer or the like, the strength to withstand the use cannot be secured and the player can step on the spike. This is because even if the leaf shaft 12 is cut or many leaf shafts 12 are entangled with spike pins, the entangled leaf shaft 12 is broken and the player cannot step on.
The thickness t of the monofilament is preferably 400 μm or less because the leaf shaft 12 becomes unnecessarily hard and the texture of the natural lawn is impaired when it is excessively thick.

  At this time, the monofilament fineness of the monofilament is preferably 200 dtex or more and the width w is more than twice the thickness t.

  The term “no crimp” in the present invention means that the monofilament axis is not bent and is straight, and is “crimped” (that is, twisted heat set or twisted / heat set / denited, etc. It means that the bent state of the lead is not heat set.

In order to bind the monofilaments so that it is not difficult to deliver from the needle to the looper during the leaf axis formation process, that is, the transfer process from the needle to the looper in the tufting process. Even if the pile yarn is twisted about ~ 20 times, “twisting” of that degree does not mean “crimping”.
This is because even when the needle is delivered from the looper to the looper, the monofilaments that are delivered and locked to the looper are sheared by the looper and the knife immediately after the delivery, and then the multiple leaf shafts. This is because the untwisting torque acts on each leaf shaft 12 and each leaf shaft 12 enters an uncrimped state.

  In the present invention, the “leaf axis” means that a single pile yarn composed of a plurality of monofilaments is inserted into the base fabric 11 by a needle, passed from the needle to the looper, and then sheared by the looper and the knife. When a pair of pile pieces is formed, it means a shear piece of individual monofilaments formed by separately separating a plurality of monofilaments constituting one pile yarn.

In the present invention, as described above, the monofilament is intentionally flattened with a flat cross-sectional shape because the frictional resistance of the leaf shaft 12 is reduced and the frictional heat generated by sliding during the competition is less. This is because the safety of the person is improved.
Also, from the viewpoint of the construction of the artificial lawn 10, in competitions such as soccer, since the leaf shaft 12 is used in an upright state, granules such as sand are put between the leaf shafts 12. It becomes easy to pack between the leaf shafts 12 formed on the surface of the cloth 11 and the leaf shafts 12 can be easily erected, thereby improving the workability.

  Natural sand, synthetic resin pellets, and tire crushed rubber pellets are used for the granules packed between the leaf shafts 12 when the artificial lawn 10 is constructed. And can be packed between the leaf shafts 12.

The artificial lawn 10 in which the leaf shaft 12 is composed of monofilaments of polypropylene resin or polyethylene resin having a single fiber fineness of 200 dtex or more and a flat cross section thickness t of 100 μm or more as described above is easy to slide, and even if it slides during the competition, it will rub. Heat does not easily occur and the leaf shaft 12 is difficult to cut.
As shown in FIG. 3, a plurality of leaf shafts 12a, 12b, 12c,... Formed by a plurality of monofilaments constituting one pile yarn are unclamped because they are not crimped. In other words, the tips 13a, 13b, 13c,... Of the leaf shafts 12a, 12b, 12c,... Are individually dispersed and constitute the surface of the artificial lawn 10 that is constructed by packing the granules.

The reason why the self-crosslinking type carboxyl-modified styrene / butadiene copolymer is applied to the backing adhesive as a resin component is that crosslinking is performed without the need for a vulcanizing agent or a vulcanization accelerator.
Diphenylmethane diisocyanate is added to the backing adhesive because it acts on the carboxyl group of the carboxyl-modified styrene / butadiene copolymer to increase the degree of crosslinking of the carboxyl-modified styrene / butadiene copolymer. This is because improvement in water resistance of the butadiene copolymer is expected.

  The amount of diphenylmethane diisocyanate is 10 parts by weight or more and 80 parts by weight or less based on 100 parts by weight of the carboxyl-modified styrene / butadiene copolymer when the amount of diphenylmethane diisocyanate is less than 10 parts by weight. The effect of blending diphenylmethane diisocyanate is small, and when the blending amount of diphenylmethane diisocyanate exceeds 80 parts by weight, the usable time of the adhesive for backing is shortened, and it is applied to the back side of the artificial grass raw material This is because in the process, the backing adhesive begins to harden and it becomes difficult to apply the backing adhesive.

The reason why the filler is incorporated into the backing adhesive is to make the backing adhesive film hard and difficult to deform, and to ensure that the back stitch of the pile yarn is firmly gripped by the backing adhesive coating. It is.
However, if the blending amount of the filler is too large, the coating film of the backing adhesive becomes brittle, and the gripping force on the back stitch decreases.
Considering this, the blending amount of the filler is preferably 50 parts by weight or more and 200 parts by weight or less with respect to 100 parts by weight of the carboxyl-modified styrene / butadiene copolymer.

  The leaf shaft 12 composed of a monofilament of polypropylene resin or polyethylene resin having a single fiber fineness of 200 dtex or more and a thickness t of 100 μm or more has an advantage that the tips 13a, 13b, 13c,. It is easy to slip on and easy to pull out.

  However, in the artificial lawn 10 according to the present invention, the crosslinking property of the carboxyl-modified styrene / butadiene copolymer is obtained by using a self-crosslinking type carboxyl-modified styrene / butadiene copolymer as a resin component and diphenylmethane diisocyanate. The carboxyl-modified styrene / butadiene copolymer is self-crosslinked with diphenylmethane diisocyanate to increase the tackiness and improve the water resistance. Even if it gets wet in rain, the pulling strength of the leaf shaft 12 does not decrease.

A pile yarn having a flat cross-sectional shape, a thickness t of 200 μm, a width w of about 1020 μm, which is about 5 times the thickness t, a single fiber fineness of 1880 dtex, and an unstretched polyethylene monofilament 6 filaments The needle gauge (pile interval in the tufting width direction) is 15.3 mm (5/8 mm / gauge), and the stitch gauge (pile interval in the tufting length direction) is 6.1 mm (16.3 stitch / 10cm), and the warp and weft are inserted into a woven base fabric (base fabric 11) made of polypropylene filament tape yarn (flat cross section yarn), and the leaf shaft 12 of monofilament pile length h is 55 mm. An artificial lawn raw fabric was formed.
An artificial lawn 10 of the example and the comparative example was formed by applying a backing adhesive to the back side of the artificial lawn fabric and bonding and fixing a back stitch of pile yarn intervening on the back side to the base fabric 11.

[Example 1]
500 parts by weight of a carboxyl-modified styrene / butadiene copolymer latex having a solid content of 50% by mass (solid content: 250 parts by weight), 100 parts by weight of diphenylmethane diisocyanate, 3 parts by weight of a dispersant (polycarboxylic acid type), a filler ( A backing adhesive composed of 500 parts by weight of calcium carbonate and 3 parts by weight of black pigment (carbon black) is applied to the back side of the artificial grass raw fabric with a dry coating amount set to 827 g / m ² .

[Example 2]
500 parts by weight of a carboxyl-modified styrene / butadiene copolymer latex having a solid content of 50% by mass (solid content: 250 parts by weight), 150 parts by weight of diphenylmethane diisocyanate, 3 parts by weight of a dispersant (polycarboxylic acid type), a filler ( A backing adhesive composed of 500 parts by weight of calcium carbonate and 3 parts by weight of black pigment (carbon black) is applied to the back side of the artificial grass raw fabric with a dry coating amount set to 827 g / m ² .

[Comparative Example 1]
500 parts by weight of a carboxyl-modified styrene / butadiene copolymer latex having a solid content of 50% by mass (solid content 250 parts by weight), 3 parts by weight of a dispersant (polycarboxylic acid), 500 parts by weight of a filler (calcium carbonate), black A backing adhesive consisting of 3 parts by weight of pigment (carbon black) is applied to the back of the artificial grass raw fabric with a dry coating amount set to 827 g / m ² .

[Comparative Example 2]
250 parts by weight of carboxyl-modified styrene / butadiene copolymer latex with a solid content of 50% by weight (125 parts by weight of solid), 250 parts by weight of polyurethane emulsion with a solids concentration of 50% by weight (125 parts by weight of solid), a dispersant (Polycarboxylic acid-based) 3 parts by weight, filler (calcium carbonate) 500 parts by weight, black pigment (carbon black) 3 parts by weight Adhesive for backing on the back of the artificial lawn raw fabric 827 g / Set to m ² and apply.

[Stretching strength]
The unwinding strength of a pair of pile pieces (12 leaf shafts) formed by one pile yarn each of the artificial lawn 10 when dried and the artificial lawn 10 when wet in Examples 1 and 2 and Comparative Examples 1 and 2 Measurement was carried out according to JIS-L-1021-8 (pile yarn pull-out strength test method), and the results shown in Table 1 were obtained.
“2W” in the unit “N / 2W” displayed in Table 1 means two pile pieces forming a pair.
In Table 1, “PHR” regarding the amount of diphenylmethane diisocyanate blended means the number of parts by weight of diphenylmethane diisocyanate based on 100 parts by weight of the solid content of the carboxyl-modified styrene / butadiene copolymer. To do.
In Table 1, “PHR” regarding the blending amount of the filler is 100 parts by weight of a solid content of a resin composed of a carboxyl-modified styrene / butadiene copolymer and diphenylmethane diisocyanate, or , Means the blended weight part of the filler with respect to 100 parts by weight of the solid content of the carboxyl-modified styrene / butadiene copolymer or 100 parts by weight of the total solid content of the carboxyl-modified styrene / butadiene copolymer and polyurethane.

According to Table 1 above, in Comparative Examples 1 and 2, diphenylmethane diisocyanate was not added to the carboxyl-modified styrene / butadiene copolymer latex, so that the pulling strength when wet was about half of the pulling strength when dried. The thread pulling strength differs greatly between wet and dry conditions.
However, in Examples 1 and 2, by adding diphenylmethane diisocyanate to the carboxyl-modified styrene / butadiene copolymer latex, it is possible to secure a yarn pulling strength close to 100 N / 2 W, and a yarn drawing strength when dry and wet. Is kept at 0.3N / 2W or 4.8N / 2W, and the drop of the pulling strength when wet is suppressed and the water resistance is improved.

Further, in Examples 1 and 2, a carboxyl-modified styrene / butadiene copolymer latex was added to 143P. H. R. And 125P. H. R. Even when the filler is added, it is possible to suppress the difference in the unwinding strength between dry and wet to 5 N / 2 W or less, and even when the filler is added, the carboxyl-modified styrene-butadiene copolymer Even if diphenylmethane diisocyanate is added to the latex, sufficient water resistance can be exhibited.
That is, the amount of the backing adhesive can be increased and the cost can be reduced by the filler, and at the same time, the strength and durability of the backing adhesive are improved.

  It should be noted that the yarn removal strength of Example 2 is higher than the yarn removal strength of Example 1 regardless of whether it is dry or wet, and therefore, more than the carboxyl-modified styrene / butadiene copolymer latex. Pulling strength can be improved by blending diphenylmethane diisocyanate.

[Example 3]
500 parts by weight of a carboxyl-modified styrene / butadiene copolymer latex having a solid content of 50% by mass (250 parts by weight of solids), 50 parts by weight of diphenylmethane diisocyanate, 3 parts by weight of a dispersant (polycarboxylic acid type), a filler ( A backing adhesive composed of 500 parts by weight of calcium carbonate and 3 parts by weight of black pigment (carbon black) is applied to the back side of the artificial grass raw material with a dry coating amount set to 619 g / m ² .

[Example 4]
500 parts by weight of a carboxyl-modified styrene / butadiene copolymer latex having a solid content concentration of 50% by weight (solid content: 250 parts by weight), 75 parts by weight of diphenylmethane diisocyanate, 3 parts by weight of a dispersant (polycarboxylic acid type), a filler ( A backing adhesive composed of 500 parts by weight of calcium carbonate and 3 parts by weight of black pigment (carbon black) is applied to the back side of the artificial grass raw material with a dry coating amount set to 619 g / m ² .

[Example 5]
500 parts by weight of a carboxyl-modified styrene / butadiene copolymer latex having a solid content of 50% by mass (solid content: 250 parts by weight), 100 parts by weight of diphenylmethane diisocyanate, 3 parts by weight of a dispersant (polycarboxylic acid type), a filler ( A backing adhesive composed of 500 parts by weight of calcium carbonate and 3 parts by weight of black pigment (carbon black) is applied to the back side of the artificial grass raw material with a dry coating amount set to 619 g / m ² .

[Stretching strength]
In Example 3, 4 and 5, the leaf pulling strength of one leaf shaft in the dried artificial grass 10 and wet artificial grass 10 was measured according to JIS-L-1021-8 (pile yarn pull-out strength test method). The results shown in Table 2 were obtained.

As shown in Table 2 above, when Examples 3 and 4 and 5 were compared, by blending diphenylmethane diisocyanate with the carboxyl-modified styrene / butadiene copolymer latex, the amount per monofilament The difference in the pulling strength between dry and wet conditions is kept within 3.7 N, so that the drop in pulling strength when wet is suppressed and the water resistance is improved.
Furthermore, by gradually increasing the blending amount of diphenylmethane diisocyanate, the difference in the pulling strength between dry and wet is gradually reduced. H. R. In the case of, the difference in the pulling strength between dry and wet conditions is suppressed to 0.8N.

  As shown in Table 2, by increasing the blending amount of diphenylmethane diisocyanate, the crosslinking reaction is accelerated, and the usable time as the backing adhesive is gradually shortened.

  The artificial lawn 10 according to the present invention can be used not only for soccer fields and futsal fields, but also for competitions performed on lawns such as tennis and golf, and further used as lawn tiles for the purpose of rooftop greening and the like. It can also be used for lining the dust control mat placed at the store entrance.

10 Artificial Lawn 11 Base Fabric 12 Leaf Shaft 13 Leaf Shaft Tip 20 Artificial Grass 22 Leaf Shaft 30 Artificial Grass 32 Leaf Shaft 33 Leaf Shaft Tip h Pile Length t Monofilament Thickness w Monofilament Width

Claims (7)

(B) Applying a backing adhesive to the back of the artificial lawn fabric in which the pile yarn (11) is inserted into the base fabric (11) to form a leaf shaft (12) with a pile length (h) of 30 mm or more. In the artificial lawn constructed by bonding and fixing the back stitch of pile yarn to the base fabric (11),
(B) The pile yarn is composed of a plurality of crimped polyolefin monofilaments without crimping,
(C) Each monofilament constituting the pile yarn has a flat cross-sectional shape having a single fiber fineness of 200 dtex or more, a thickness (t) of 100 μm or more, and a width (w) of at least twice the thickness (t). And
(D) The artificial adhesive lawn characterized in that the backing adhesive is composed of a self-crosslinking type carboxyl-modified styrene / butadiene copolymer as a resin component and diphenylmethane diisocyanate.   2. The artificial lawn according to claim 1, wherein the compounding amount of the diphenylmethane diisocyanate is 10 parts by weight or more and 80 parts by weight or less with respect to 100 parts by weight of the carboxyl-modified styrene / butadiene copolymer.   A filler is blended in the backing adhesive, and the blending amount of the filler is 50 parts by weight or more and 200 parts by weight or less with respect to 100 parts by weight of the carboxyl-modified styrene / butadiene copolymer. The artificial lawn according to any one of claims 1 and 2.   4. The artificial lawn according to claim 1, wherein the monofilament has a single fiber fineness of 1000 dtex or more and a thickness (t) of 200 μm or more.   The artificial lawn according to any one of claims 1, 2, 3 and 4, wherein the monofilament is made of polypropylene resin or polyethylene resin, and the total fineness of the pile yarn is 5000 dtex or more. 6. The artificial lawn according to claim 1, wherein the backing adhesive has a dry coating amount of 400 g / m ² or more and 1000 g / m ² or less.   Granules are packed between the leaf shaft (12) and the leaf shaft (12) formed on the surface of the base fabric (11), and the leaf shaft (12) is used in an upright state by the granules. The artificial lawn according to any one of claims 1, 2, 3, 4, 5, and 6.

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