JP2005336954A - Cushioned floor material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cushioned floor material which has excellent environmental adaptability and does not reduce productivity and further has a low adhesive surface and excellent cushioning characteristics and surface strength. <P>SOLUTION: The cushioned floor material is formed of a substrate layer, a foamed layer, and a top layer. At least either the top layer or the foamed layer is formed of an acrylic plastisol composition containing acrylic polymer particles having core-shell structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a low environmental load floor material that does not contain a halogen-based resin such as polyvinyl chloride, and more particularly to a cushion floor floor material using acrylic plastisol.

  A plastisol composition composed of polyvinyl chloride (hereinafter abbreviated as a vinyl chloride sol) is used for a wide range of applications due to its excellent processability and mechanical properties. However, in recent years, the problem of environmental load derived from these halogen-based resins has become apparent, and there is a movement to limit its use.

  In view of this situation, attempts have been made to develop flooring materials that do not use polyvinyl chloride. For example, Patent Document 1 proposes a synthetic resin aqueous emulsion as a material capable of realizing physical properties equivalent to polyvinyl chloride.

  However, since the synthetic resin water-based emulsion contains a large amount of water as a dispersion medium, a process for removing this is necessary in the production of the flooring, and a conventional PVC sol production line cannot be used. In addition, since it takes time to dry, the processing speed of the production line is also slow, and there is a problem that much labor and cost are required. In addition, when the amount of the inorganic filler is small, there is a problem that the stickiness of the surface cannot be suppressed.

Under such circumstances, development of flooring materials using acrylic plastisol has been promoted. Patent Document 2 describes an example in which a plastisol composed of crosslinked acrylic polymer particles and a plasticizer is used as a floor covering material. However, since the acrylic polymer particles do not have a multilayer structure, there is a problem in that the storage stability of the sol is not practical. Moreover, since the structure of the flooring material was not a multilayer structure using a surface top layer, it was difficult to achieve both surface strength and cushioning properties.
Japanese Patent Laid-Open No. 11-286879 Japanese Patent Laid-Open No. 10-168268

  As described above, attempts have been made to replace PVC flooring materials, especially cushion flooring materials, with non-PVC materials, which satisfy all of storage stability, surface stickiness, surface strength, and cushioning properties. The current situation is that no materials have been proposed.

  The present inventors have intensively studied the above problems, and in the cushion floor floor material having a base layer, a foam layer and a top layer, the top layer or / and the foam layer contain core-shell structure acrylic polymer particles. It has been found that by using an acrylic plastisol composition, the storage stability as a sol is good, the surface is less sticky, and the cushioning property and surface strength can be improved without reducing the productivity. .

  That is, the present invention is a cushion flooring material having a base material layer, a foam layer and a top layer, wherein at least one of the top layer and the foam layer contains an acrylic polymer particle having a core-shell structure. A cushion flooring material comprising a plastisol composition.

  Since the cushion floor material of the present invention does not contain a halogen-based resin, the load on the environment is small. Further, the storage stability as a sol is good without reducing the productivity, and the effect of improving the design property, cushioning property and surface strength is exhibited.

  Hereinafter, the present invention will be described in detail.

  The cushion floor material of the present invention comprises a base material layer, a foam layer and a top layer. Usually, these three layers are sequentially laminated from the bottom to the top. In addition to these three layers, for example, a printing layer may be disposed between the foam layer and the top layer.

  The base material layer of the cushion flooring material of the present invention is a layer on which a base material as a structural material is disposed. As the base material, non-combustible paper, synthetic resin sheet, glass fiber woven fabric or non-woven fabric is used. It is done.

  The foamed layer of the cushion flooring material of the present invention is a layer that imparts cushioning properties to the flooring material, and is suitably made of a non-vinyl chloride resin. Examples of the resin constituting the foam layer include polyethylenes such as low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene; ethylene-vinyl acetate copolymer, ethylene- (meth) acrylate copolymer, etc. Ethylene copolymer; random polypropylene which is a random copolymer of propylene and ethylene, polypropylene such as block polypropylene which is a block copolymer of propylene and ethylene, etc .; polybutene, butene-α-olefin copolymer, etc. Butene copolymers; thermoplastic elastomers such as olefins, polyesters, urethanes, and styrenes; non-vinyl chloride plastisols such as acrylic plastisols; or mixtures thereof.

  Among them, it is preferable to use an acrylic plastisol composition (hereinafter abbreviated as acrylic sol) obtained by dispersing an acrylic polymer in a plasticizer. Since this has the same form and properties as the currently widely used vinyl chloride sol, it is possible to obtain the same productivity by using a production line equivalent to the vinyl chloride sol.

  As an acrylic polymer used for the acrylic sol, 30 to 85% by mass of methyl methacrylate, 70 to 15% by mass of (meth) acrylic acid ester having 3 to 8 carbon atoms, and 0 to 20% by mass of other copolymerizable monomers. These copolymers are preferred. By using such an acrylic polymer copolymerized with a (meth) acrylic acid ester of a C3-C8 alcohol, compatibility with various plasticizers can be exhibited. It becomes possible to widen the width.

  Although it does not specifically limit as (meth) acrylic acid ester of C3-C8 alcohol used for this invention, n-butyl (meth) acrylate, i-butyl (meth) acrylate, t-butyl (meth) acrylate , (Meth) acrylates of linear or branched alkyl alcohols such as hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, and (meth) acrylates of cyclic alkyl alcohols such as cyclohexyl (meth) acrylate ) Acrylates and (meth) acrylates of aromatic alcohols such as benzyl (meth) acrylate.

  Other copolymerizable monomers include (meth) acrylates of linear alkyl alcohols such as ethyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, (poly) ethylene glycol di (meth) ), Polyfunctional (meth) acrylates such as propylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, and epoxy groups such as glycidyl (meth) acrylate Containing monomer, methacrylic acid, acrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, 2-succinoloyloxyethyl methacrylate, 2-malenoyloxyethyl methacrylate, 2-phthaloyloxyethyl methacrylate, METAKU Carboxyl group-containing monomers such as 2-hexahydrophthaloyloxyethyl oxalate, sulfonic acid group-containing monomers such as allyl sulfonic acid, carbonyl group-containing (meth) acrylates such as acetoacetoxyethyl (meth) acrylate, 2-hydroxy Hydroxyl group-containing (meth) acrylates such as ethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate, cyclic ether group-containing (meth) acrylates such as tetrahydrofurfuryl (meth) acrylate, N-dimethylaminoethyl ( Amino group-containing (meth) acrylates such as (meth) acrylate, N-diethylaminoethyl (meth) acrylate, diacetone acrylamide, N-methylol acrylamide, N-methoxymethyl acrylamide, N-ethoxymethyl acrylate Ruamido, acrylamide and its derivatives such as N- butoxymethyl acrylamide, urethane modified acrylates, epoxy modified acrylates, although silicones modified acrylate and the like are widely used, but is not limited to these examples monomers.

  The acrylic polymer is not particularly limited, but it is preferable to use a powdered polymer so that a uniform sol can be rapidly formed by mixing with a plasticizer or the like. As a method for producing the acrylic polymer powder, for example, various methods such as a method of spray-drying after emulsion polymerization and a fine suspension polymerization method can be applied.

  The acrylic polymer particles used in the present invention preferably have a core-shell structure. By introducing a core-shell structure into the acrylic polymer, it becomes easy to achieve both storage stability as a plastisol and heat film-forming property. The core-shell structure referred to in the present invention means that having a multilayer structure of at least two layers of a core and a shell surrounding the outer periphery thereof, and the shell part in the case of a multilayer structure of three or more layers is the outermost peripheral layer. Moreover, a core part means all the components contained in the other inner layers except a shell part. In this case, it is preferable that the core portion has a structure containing more (meth) acrylic acid ester components of alcohol having 3 to 8 carbon atoms. In the case of the core / shell structure, the core / shell ratio (mass ratio) is preferably 30/70 to 90/10, and more preferably 40/60 to 80/20.

  Various plasticizers can be used as needed for the acrylic sol used in the foamed layer of the cushion floor material of the present invention. Various plasticizers can be used as long as they have the ability to plasticize acrylic polymers. Examples thereof include dialkyl phthalates such as dibutyl phthalate, dihexyl phthalate, dioctyl phthalate, diisononyl phthalate, and diisodecyl phthalate; Alkylbenzyl phthalates such as butylbenzyl phthalate; alkylaryl phthalates; dibenzyl phthalates; diaryl phthalates; or triaryl phosphates such as tricresyl phosphate, trialkyl phosphates, alkylaryl phosphates, etc. Furthermore, aliphatic dibasic acid esters such as adipine dibutyl; ether-containing compounds such as polyethylene glycol, polypropylene glycol, and dibutyl glycol adipate; polyester plasticizers, soybean oil plasticizers such as epoxidized soybean oil, etc. Raising It is. These plasticizers can be used alone or in combination of two or more plasticizers. The plasticizer is preferably used in an amount of 200 parts by mass or less with respect to 100 parts by mass of the acrylic polymer.

  Preferred plasticizers used in the present invention include phthalate ester plasticizers, with dioctyl phthalate and diisononyl phthalate being particularly preferred.

  The foam layer is usually formed on a base material, and may be formed by applying it to a mechanically foamed acrylic sol base material and heating and gelling, or by adding an acrylic sol with a foaming agent added and dispersed therein. It may be formed by coating / heating and foaming, or may be formed by applying an acrylic sol to which a hollow balloon is added / dispersed and gelling by heating. Here, mechanical foaming refers to a method of mixing air bubbles by mechanically stirring an acrylic sol and mixing air.

  As the foaming agent, a microcapsule type foaming agent and a heat decomposable foaming agent can be used. Any one of these may be selected and used, or a microcapsule type foaming agent and a heat decomposable foaming agent may be used in combination.

  As the heat decomposable foaming agent, at least one selected from azo compounds, nitroso compounds and hydrazine derivatives is used. Specific examples of the azo compound include azodicarbonamide and azobisisobutyronitrile. Specific examples of the nitroso compound include N, N′-dinitrosopentamethylenetetramine, N, N′-dimethyl-N, N′-dinitrosotephthalamide and the like. Specific examples of the hydrazine derivative include sulfonyl hydrazides such as benzenesulfonyl hydrazide, p, p'-oxybis (benzenesulfonyl hydrazide), and toluenesulfonyl hydrazide. These pyrolytic foaming agents may be used alone or in combination of two or more.

  The foaming agent is preferably used in an amount of 0.05 parts by mass or more, particularly preferably 0.1 parts by mass or more, based on 100 parts by mass of the acrylic polymer particles because foamability is improved. Since there exists a tendency for dimensional stability to be acquired, it is preferable to use these foaming agents at 20 mass parts or less, and 15 mass parts or less are especially preferable.

  A substance capable of lowering the thermal decomposition temperature of the pyrolytic foaming agent (hereinafter abbreviated as “kicker”) can also be blended. The kicker used in the present invention is not particularly limited, and specific examples include dibasic lead sulfate, lead stearate, zinc oxide, zinc carbonate, chrome yellow and the like. The kicker is preferably used in an amount of 0.01 parts by mass or more, particularly preferably 0.05 parts by mass or more, based on 100 parts by mass of the acrylic polymer particles because the foamability tends to be good. Further, from the viewpoint of easy adjustment of the foaming temperature, these kickers are preferably used in an amount of 20 parts by mass or less, particularly preferably 15 parts by mass or less.

  An inorganic filler can be added to the foamed layer as necessary. Examples of inorganic fillers include calcium carbonate, aluminum hydroxide, magnesium hydroxide, pearlite, clay, colloidal silica, mica powder, quartz sand, diatomaceous earth, kaolin, talc, bentonite, glass powder, aluminum oxide, fly ash, shirasu balloon, etc. Is mentioned. These fillers can be used alone or in combination of two or more fillers. Among these, since it is cheap, it is preferable to use calcium carbonate as one kind of filler. Although it does not specifically limit as said inorganic filler, It is preferable to use a thing with an average particle diameter of 0.01-50 micrometers. When added to the acrylic sol used for the foamed layer, the blending ratio is not particularly limited, but is preferably 10 to 1000 parts by mass per 100 parts by mass of the acrylic polymer particles.

  As long as the gist of the present invention is not impaired in the foam layer, a non-halogen flame retardant, a viscosity modifier, an antifoaming agent, an antifungal agent, a deodorant, an antibacterial agent, a surfactant, a lubricant, an ultraviolet absorber, You may mix | blend pigments, such as a fragrance | flavor, a leveling agent, an adhesive agent, titanium oxide, and carbon black. Moreover, it is good also as an organosol by mix | blending the organic solvent in which the acrylic polymer particle used for this invention does not melt | dissolve instantaneously, such as a mineral terpene and a mineral spirit.

  The top layer of the cushion flooring material of the present invention is a layer that imparts surface strength to the flooring material, and is suitably a non-vinyl chloride resin like the foamed layer. As the resin constituting the top layer, polyethylene such as low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene; ethylene-vinyl acetate copolymer, ethylene- (meth) acrylate copolymer, etc. Ethylene copolymer; random polypropylene which is a random copolymer of propylene and ethylene, polypropylene such as block polypropylene which is a block copolymer of propylene and ethylene, etc .; polybutene, butene-α-olefin copolymer, etc. Butene copolymers; thermoplastic elastomers such as olefins, polyesters, urethanes, and styrenes; polyester resins; polyamide resins; polyurethane resins; non-vinyl chloride plastisols such as acrylic sols; or mixtures thereof.

  Among them, acrylic sol is particularly preferable because productivity equivalent to that of vinyl chloride sol can be obtained. As this acrylic sol, those similar to the acrylic sol used for the foamed layer are used, and it is preferable to use acrylic polymer fine particles having a core-shell structure, as in the case of the foamed layer.

  However, it is more preferable that hollow resin particles are added to the acrylic sol constituting the top layer. This is because by using the hollow resin fine particles, the surface strength can be imparted while maintaining the transparency, and the design can be improved by removing the gloss of the surface.

  As the hollow resin particles, hollow crosslinked fine particles composed of a polymerizable monomer selected from (meth) acrylic acid, (meth) acrylic acid ester and (meth) acrylonitrile and a polyfunctional crosslinking agent are preferable. The amount of the hollow resin particles added is preferably 0.1 parts by mass or more per 100 parts by mass of the acrylic polymer fine particles used in the top layer because the surface strength and the matte effect are exhibited. Further, since the tear strength derived from the acrylic polymer fine particles is not hindered, the amount of the hollow resin particles added is preferably 100 parts by mass or less.

  As long as the top layer does not impair the gist of the present invention, non-halogen flame retardants, viscosity modifiers, antifoaming agents, antifungal agents, deodorants, antibacterial agents, surfactants, lubricants, UV absorbers, Flavor, leveling agent, adhesive, calcium carbonate, aluminum hydroxide, perlite, clay, colloidal silica, mica powder, quartz sand, diatomaceous earth, kaolin, talc, bentonite, glass powder, aluminum oxide, fly ash, shirasu balloon, etc. A pigment such as titanium oxide or carbon black may be blended. Moreover, it is good also as an organosol by mix | blending the organic solvent in which the acrylic polymer particle used for this invention does not melt | dissolve instantaneously, such as a mineral terpene and a mineral spirit.

  In the cushion flooring material of the present invention, it is necessary that at least one of the top layer and the foamed layer contains an acrylic polymer particle having a core-shell structure. By using acrylic polymer particles with a core-shell structure, the productivity of the cushion flooring material is not lowered, the storage stability as an acrylic sol is kept well, the surface is not sticky, and the cushioning properties In addition, the surface strength can be improved.

  In the present invention, various processes such as embossing can be performed on the top layer and the foamed layer. As embossing, pressing a roll with irregularities against the gelled acrylic sol, and printing with mechanical embossing to form an irregular pattern, or ink added with a foam inhibitor, There are chemical embossing to develop a concavo-convex pattern.

  The mechanical embossing may be performed on the foamed layer of acrylic sol, or may be performed after the surface of another intermediate layer or top layer is applied. The foaming step for expressing chemical embossing may be performed before the surface top layer is applied, or an embossed pattern may be expressed by applying the foaming step after applying the surface top layer.

  Both mechanical embossing and chemical embossing may be performed simultaneously. In that case, after performing mechanical embossing, chemical foaming may be expressed by heating and foaming, or the reverse order may be used.

  A printed layer can also be provided on the cushion floor material of the present invention. This layer is formed, for example, by a printing process applied to the back surface of the top layer or the surface of the foam layer. Specifically, using a solvent-based or water-based printing ink, the layer is printed on a suitable printing machine such as a gravure printer. It can also be formed by printing several times to several times, or by using transfer paper or the like. These inks and transfer paper may contain the above-described chemical embossing suppression ink. The foamed layer which consists of a foaming part and a non-foaming part can be formed in these, when the printing layer which gave the foaming inhibitor according to the design is transcribe | transferred on a foaming layer and it heat-foams. Examples of the foaming inhibitor contained in the ink include trimellitic acid, maleic anhydride, benzotriazole, aminotriazole and the like.

Hereinafter, the present invention will be described more specifically according to examples.
[Synthesis of acrylic polymer fine particles A1]
Add 952 g of pure water to a 5 liter four-necked flask equipped with a thermometer, nitrogen gas inlet tube, stirring rod, dropping funnel and cooling tube, and thoroughly vent nitrogen gas for 30 minutes to dissolve dissolved oxygen in pure water. Was replaced. After stopping nitrogen gas flow, 45.6 g of methyl methacrylate and 34.9 g of n-butyl methacrylate were added, and the temperature was raised to 80 ° C. while stirring at 150 rpm. When the internal temperature reached 80 ° C., 0.70 g of potassium persulfate dissolved in 28 g of pure water was added all at once, and soap-free polymerization was started. Stirring was continued for 60 minutes at 80 ° C. to obtain a seed particle dispersion.

  Subsequently, a monomer emulsion (methyl methacrylate 359.7 g, n-butyl methacrylate 340.3 g, sodium dialkylsulfosuccinate (Perex O-TP, trade name, manufactured by Kao Corp.) 7.00 g is added to the seed particle dispersion. And 350.0 g of pure water mixed and stirred for emulsification) was added dropwise over 2.5 hours, followed by continuing stirring at 80 ° C. for 1 hour to obtain a polymer dispersion.

  Subsequently, a monomer emulsion (439.6 g of methyl methacrylate, 249.6 g of n-butyl methacrylate, 10.78 g of methacrylic acid, 7.00 g of Plex O-TP, and 350.0 g of pure water was mixed and stirred with respect to this polymer dispersion. And then emulsified) was added dropwise over 2.5 hours, and stirring was continued at 80 ° C. for 1 hour to obtain a polymer dispersion.

After cooling the obtained polymer dispersion to room temperature, using a spray dryer (L-8 type, manufactured by Okawahara Kako Co., Ltd.), the inlet temperature is 170 ° C., the outlet temperature is 75 ° C., and the atomizer speed is 25000 rpm. Spray drying was performed to obtain acrylic polymer fine particles (1).
[Synthesis of acrylic polymer fine particles (2)]
Acrylic polymer fine particles (2) having no core-shell structure having the composition shown in Table 1 were prepared by a method similar to the synthesis of acrylic polymer fine particles (1).

Abbreviations in the table are as follows.
MMA Methyl methacrylate nBMA n-Butyl methacrylate MAA Methacrylic acid <Example 1>
[Adjustment of acrylic sol]
An acrylic sol was prepared according to the following blending ratio. The acrylic polymer fine particles (1) were used as the resin.
(For foam layer)
Acrylic polymer particles (1) 100 parts by weight diisononyl phthalate 80 parts by weight texanol benzyl phthalate 20 parts by weight calcium carbonate 50 parts by weight azodicarbonamide-based blowing agent 3 parts by weight zinc oxide (kicker) 2 parts by weight (top layer) for)
Acrylic polymer particles (1) 100 parts by mass Diisononyl phthalate 100 parts by mass Hollow resin particles 10 parts by mass In addition, as the azodicarbonamide-based foaming agent, VINYHALL AC # 3C (trade name, manufactured by Eiwa Kasei Kogyo Co., Ltd.) As the hollow resin particles, Matsumoto Microsphere M-610 (trade name, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) was used.
[Evaluation of acrylic sol]
The acrylic sol was evaluated according to the following criteria. Evaluation was performed for both the acrylic sol for the top layer and the acrylic sol for the foam layer, and the results are shown in Table 1. The evaluation of the acrylic sol for the foam layer was carried out for those prepared by removing the foaming agent from the above formulation.
[Storage stability]
The acrylic sol was kept in a thermostatic chamber at 25 ° C., taken out after 5 days, and the viscosity was measured again. The storage stability was evaluated by calculating the viscosity increase rate of the acrylic sol as follows.
{(Viscosity after storage / initial viscosity) -1} × 100 (%)
A: Less than 20% B: 20% or more and less than 50% B: 50% or more X: Viscosity cannot be measured (gelation)
[Bleed-out test]
A test sample was prepared by placing an acrylic sol in an aluminum cup and baking it at 130 ° C. for 20 minutes. The sample was stored at room temperature, and the bleed-out state of the plasticizer after 1 day at 40 ° C. was judged by touch.
○ No bleed out × With bleed out [Preparation of cushion floor material]
An acrylic sol was coated to a thickness of 0.4 mm on a 0.2 mm-thick substrate (glass fiber nonwoven fabric), and gelled so that the foaming agent was not decomposed at 180 ° C. for 1 minute. . Next, a printing layer (0.1 mm) containing trimellitic anhydride as a foaming inhibitor was transferred to the gelled sheet. Further, the top layer was coated with a thickness of 0.3 mm from above, and heated at 200 ° C. for 3 minutes as it was to obtain a cushion flooring material with chemical embossing. The part where there was no foam inhibitor became a thickness of 1.8 mm in total of the four layers after foaming.
<Evaluation of the obtained cushion floor material>
[Surface strength]
The obtained cushion floor material was subjected to a JIS K7204 wear test using a plastic wear wheel and evaluated according to the following criteria. For the test, a wear wheel CS-10 (load 1 kg) was used, and the area where the printed layer could be read in the wear area after 500 revolutions was visually evaluated.
○ Readable area 70% or more △ Readable area 30% or more and less than 70% x Readable area less than 30% [cushioning]
A dent test (20 ° C.) described in JIS A1454 was performed on the cushion floor material, and the dent amount was judged according to the following criteria.
○ 0.3mm or more × less than 0.3mm
[Example 2]
An acrylic sol was coated to a thickness of 0.4 mm on a 0.2 mm-thick substrate (glass fiber nonwoven fabric), and gelled so that the foaming agent was not decomposed at 180 ° C. for 1 minute. . Next, a 0.1 mm thick printed layer containing the foam inhibitor, trimellitic anhydride, was transferred to the gelled sheet. Further, a 0.8 mm-thick ethylene-vinyl acetate copolymer (3) sheet was laminated thereon and heated as it was at 200 ° C. for 3 minutes to obtain a cushion floor material with chemical embossing. The portion where there was no foam inhibitor became a thickness of 2.3 mm in total after the foaming.
[Example 3]
A sheet of urethane foam (4) having a thickness of 1.2 mm was bonded to a base material (nonwoven fabric of glass fiber) having a thickness of 0.2 mm. Next, a 0.1 mm thick printed layer was transferred to the gelled sheet. Further, the top layer was coated with a thickness of 0.3 mm from above and heated at 200 ° C. for 3 minutes to obtain a cushion floor material. After foaming, the total thickness of the four layers was 1.8 mm.
[Comparative Example 1]
The same procedure as in Example 1 was performed except that an acrylic sol was prepared using the acrylic polymer fine particles (2).
[Comparative Example 2]
The same operation as in Example 1 was performed except that the top layer was not formed.
[Consideration of each example]
Each example and comparative example will be discussed below.

[Consideration of each example]
Each example and comparative example will be discussed below.
<Example 1>
Example 1 has excellent storage stability, no bleed-out, and very good surface strength and cushioning properties.
<Example 2>
Example 2 has excellent storage stability, no bleed out, and very good cushioning properties.
<Implementation 3>
Example 3 has excellent storage stability, no bleed-out, and very good surface strength and cushioning properties.
<Comparative Example 1>
In Comparative Example 1, since the acrylic polymer particles did not have a core-shell structure, the storage stability was low.
<Comparative example 2>
Comparative Example 2 is an example in which the top layer was not used. Since the top layer was not used, the surface strength was low.
<Comparative Example 3>
Comparative Example 3 is an example in which no foamed layer was used. Since the foam layer was not used, cushioning properties were poor.

Claims (2)

  A cushion floor material comprising a base material layer, a foam layer and a top layer, wherein at least one of the top layer and the foam layer is composed of an acrylic plastisol composition containing acrylic polymer particles having a core-shell structure. Cushion floor material characterized by that. The cushion floor material according to claim 1, wherein hollow resin particles are blended in the top layer.