JP6436563B2 - Antiviral interior sheet - Google Patents

Description

  The present invention relates to an interior sheet excellent in antiviral properties and stain resistance.

  Viral diseases such as severe respiratory infection (SARS) virus, avian influenza virus, foot-and-mouth disease virus, and new influenza virus are becoming social problems one after another. Originally, the host range of viruses is limited, and it is normal that only mammals infect mammals and only birds infect birds. However, since avian influenza virus is a virus with a wide host range that can infect not only birds but also mammals, it may infect humans. At present, H5N1 avian influenza virus is prevalent in Asia and Europe, and the emergence of highly toxic influenza mutated based on it is feared. For this reason, anti-virus products are expected not only for medical relations such as hospitals, health centers, nursing homes, etc. but also for general public facilities and homes in preparation for a pandemic (infection explosion) caused by viruses.

  Antiviral agents prevent the virus from entering cells by inactivating the infectivity of the virus. As such an antiviral agent, for example, slaked lime is known, and Patent Document 1 discloses a resin film containing slaked lime.

JP 2011-152102 A

Here, a general interior sheet is used after being subjected to antifouling treatment such as applying wax after construction as a countermeasure against contamination. Therefore, even if the interior sheet has sufficient antiviral properties, the antiviral properties may be insufficient due to the wax treatment. Therefore, since the wax treatment cannot be performed in order to exert antiviral properties, there is a possibility that the stain resistance becomes insufficient.
Then, in view of the above situation, an object of the present invention is to provide an interior sheet excellent in antiviral properties and contamination resistance.

The means used by the present invention in order to solve the above-mentioned problems is an interior sheet having at least a surface layer, and the surface layer contains 0.1 part of a sulfonic acid surfactant per 100 parts by weight of the polyvinyl chloride resin. and 10.0 parts by weight, a plasticizer from 10 to 50 parts by weight, Ri Do from polyvinyl chloride resin composition containing a silicone-based copolymer 20 parts by weight, the surface layer of the polyvinyl chloride resin Is an interior sheet characterized by containing 49 to 1 part by weight of vinyl chloride resin for paste and 51 to 99 parts by weight of suspension vinyl chloride resin .
Furthermore, before Symbol paste vinyl chloride resin containing a sulfonic acid-based surfactants, also resin composition constituting the surface layer is to contain 1 to 50 parts by weight filler.

  ADVANTAGE OF THE INVENTION According to this invention, the interior sheet excellent in antiviral property and stain resistance can be obtained. The interior sheet of the present invention does not easily adhere to dirt, and even if dirt is attached, it can be removed by simple cleaning. For this reason, it can be used without applying antifouling treatment such as wax, and therefore it can sufficiently exhibit antiviral properties. In addition, by using a vinyl chloride resin for paste containing a sulfonic acid surfactant in the surface layer, coloring of the resin can be suppressed, the appearance can be improved, and the interior sheet can be further improved in antiviral properties. Moreover, workability is improved by adding 1 to 50 parts by weight of a filler to the surface layer.

Hereinafter, the present invention will be described in detail.
The interior sheet of the present invention comprises 0.1 to 10.0 parts by weight of a sulfonic acid surfactant, 10 to 50 parts by weight of a plasticizer, and a silicone copolymer with respect to 100 parts by weight of a polyvinyl chloride resin. It is an interior sheet having a surface layer made of a polyvinyl chloride resin composition containing 1 to 20 parts by weight.
In order to impart antiviral properties to the interior sheet, it is necessary to contain 0.1 to 10.0 parts by weight of a sulfonate surfactant with respect to 100 parts by weight of the polyvinyl chloride resin.
First, this point will be described in detail below.

  The polyvinyl chloride resin used for the surface layer of the interior sheet is a thermoplastic resin mainly composed of vinyl chloride, but may contain a copolymer component other than vinyl chloride. The amount of the copolymer component other than vinyl chloride is not particularly limited as long as it does not affect the present invention, but the content of the copolymer monomer component is 0 to 30 mol% in the total monomer components. It is preferable that it is 0-10 mol%. Specifically, polyvinyl chloride, ethylene-vinyl chloride copolymer, propylene-vinyl chloride copolymer, vinyl chloride-acrylic resin copolymer, vinyl chloride-urethane copolymer, vinyl chloride-vinylidene chloride copolymer And vinyl chloride-vinyl acetate copolymer. These polyvinyl chloride resins may be used alone or in combination of two or more. Among these polyvinyl chloride resins, polyvinyl chloride is preferable in terms of processability and cost.

  The average degree of polymerization of the polyvinyl chloride resin is not particularly limited as long as it can be substantially molded. However, the average degree of polymerization is preferably in the range of 500 to 2000, and the average degree of polymerization of 700 to 1800. A range is further preferred. If the average degree of polymerization is less than 500, it is difficult to process because the viscosity at the time of melting is low. Regarding the stain resistance of the interior sheet, the greater the average degree of polymerization of the polyvinyl chloride resin, the better the stain resistance.

  The sulfonic acid surfactants include alkyl sulfate surfactants, alkyl benzene sulfonate surfactants, alkyl naphthalene sulfonate surfactants, alkyl diphenyl ether disulfonate surfactants, polyoxyethylene alkyl sulfate surfactants. Surfactant, naphthalene sulfonic acid formalin condensate may be mentioned. Alkylbenzene sulfonic acid surfactants are preferred because of their high antiviral effect, and dodecylbenzene sulfonic acid surfactants are more preferred. Furthermore, as the sulfonic acid surfactant, alkali metal salts such as sodium salt and potassium salt, and alkaline earth metal salts such as calcium and barium can be suitably used.

  The content of the sulfonic acid surfactant used in the present invention is 0.1 to 10.0 parts by weight, preferably 1 to 8.1 parts by weight, based on 100 parts by weight of the polyvinyl chloride resin. -5 parts by weight is more preferred. When the content is less than 0.1 parts by weight, the antiviral effect is poor, and when the content exceeds 10 parts by weight, the processability is poor, and the surface condition is poor due to bleeding, which may easily cause contamination.

When a sulfonic acid surfactant is added to a polyvinyl chloride resin and molding is performed, the polyvinyl chloride resin may be colored.
Regarding the above problem, coloring of the resin can be effectively suppressed by using a vinyl chloride resin for paste to which a sulfonic acid surfactant is added in advance.

  The vinyl chloride resin for paste is a fine polymer particle having a particle diameter of 0.02 to 20.0 μm, which is mainly obtained by an emulsion polymerization method or a micro suspension polymerization method. It is a general feature.

  As a method for producing the vinyl chloride resin for paste, any production method can be used as long as the vinyl chloride resin for paste of the present invention can be obtained. The most common method is vinyl chloride. Emulsion polymerization method in which polymerization monomer is polymerized with gentle stirring together with deionized water, emulsifier and water-soluble polymerization initiator, seed emulsion polymerization method in which emulsion polymerization is performed using particles obtained by emulsion polymerization method as seed, A micro-suspension weight in which a vinyl monomer is mixed and dispersed with deionized water, an emulsifier, if necessary an emulsification aid such as higher alcohol, and an oil-soluble polymerization initiator with a homogenizer, and then polymerized with gentle stirring. Obtained by polymerization at a polymerization temperature of 30 to 80 ° C. by a seed micro suspension polymerization method in which polymerization is performed using a seed containing an oil-soluble polymerization initiator obtained by a combination method or a micro suspension polymerization method. After spray drying the latex, it may be mentioned a method of making a paste vinyl chloride resin by grinding.

  Here, the antiviral vinyl chloride resin composition exhibits antiviral properties by adding a predetermined amount of a sulfonic acid surfactant to the polyvinyl chloride resin. And in order to suppress initial coloring at the time of a shaping | molding process, expressing a higher antiviral property, it is preferable that the sulfonic acid type surfactant is added to the vinyl chloride resin for pastes. Here, the sulfonic acid surfactant can be added as an emulsifier in the polymerization. In this case, a vinyl chloride resin for paste having desired properties may not be obtained due to the influence of the added sulfonic acid surfactant.

  On the other hand, the sulfonic acid surfactant is water-soluble. Further, when producing a vinyl chloride resin for paste by emulsion polymerization or seed emulsion polymerization, a latex using water as a solvent is obtained as an intermediate form after polymerization. Therefore, by adding a sulfonic acid surfactant to this latex, the sulfonic acid surfactant is well dispersed in the vinyl chloride resin. Thus, the vinyl chloride resin for paste which has a desired property is obtained, without affecting polymerization conditions by adding a sulfonic-acid type surfactant to the latex after superposition | polymerization. Thereby, the effect of high antiviral property and suppression of the initial coloring at the time of a shaping | molding process can be acquired more efficiently.

  As the sulfonic acid surfactant to be added to the polymerized latex when producing a vinyl chloride resin for paste, the aforementioned sulfonic acid surfactants can be used, such as alkyl sulfate ester surfactants, alkylbenzenes. Examples include sulfonic acid surfactants, alkylnaphthalene sulfonic acid surfactants, alkyl diphenyl ether disulfonic acid surfactants, polyoxyethylene alkyl sulfate ester surfactants, and naphthalene sulfonic acid formalin condensates. Alkylbenzene sulfonic acid surfactants are preferred because of their high antiviral effect, and dodecylbenzene sulfonic acid surfactants are more preferred. Furthermore, as the sulfonic acid surfactant, alkali metal salts such as sodium salt and potassium salt, and alkaline earth metal salts such as calcium and barium can be suitably used.

  The content of the sulfonic acid surfactant contained in the polyvinyl chloride resin for paste to which the sulfonic acid surfactant has been added in advance is the sum of the polyvinyl chloride resin for paste and the sulfonic acid surfactant, It is preferably 0.1 to 15% by weight, more preferably 0.7 to 10% by weight, and particularly preferably 1.0 to 7.5% by weight. If it is less than 0.1% by weight, the antiviral property when it is used as an interior sheet is poor, and if it exceeds 15% by weight, the productivity of producing vinyl chloride resin for paste becomes poor.

  The average degree of polymerization of the polyvinyl chloride resin for paste is not particularly limited as long as it can be substantially molded, but an average degree of polymerization of 500 to 2000 is preferable, and an average degree of polymerization of 700 to A range of 1800 is more preferred. If the average degree of polymerization is less than 500, it is difficult to process because the viscosity at the time of melting is low, and if the average degree of polymerization exceeds 2000, the viscosity at the time of melting may be high, which may make it difficult to process.

  When a polyvinyl chloride resin for paste is used, if a liquid such as a plasticizer is mixed due to the characteristics of the polyvinyl chloride resin for paste, a paste is formed at room temperature, and the processing method is limited to the coating method or the like. In the case of molding by a melt shaping method in which a resin composition is heated and melted, kneaded, shaped and then cooled and solidified, it is preferably blended with a suspension vinyl chloride resin.

  Here, the suspension vinyl chloride resin is a polymer particle having a particle diameter of 50 to 200 μm, which is mainly obtained by a suspension polymerization method, and is a porous amorphous vinyl chloride resin. By having such a porous shape, a liquid such as a plasticizer can be absorbed, so that a paste can be prevented.

  The blend ratio of the vinyl chloride resin for the paste and the suspension vinyl chloride resin is 100 parts by weight of the polyvinyl chloride resin (here, the total of the vinyl chloride resin for suspension and the suspension vinyl chloride resin). The content of the activator is 0.1 to 10.0 parts by weight, and is not particularly limited as long as molding processing is not a problem. Among the polyvinyl chloride resins, the vinyl chloride resin for paste is 100 to 100%. 1% by weight, preferably 0 to 99% by weight of suspension vinyl chloride resin, more preferably 70 to 10% by weight of vinyl chloride resin for paste, 30 to 90% by weight of suspension vinyl chloride resin, and vinyl chloride resin for paste Is most preferably 50 to 20% by weight and suspension vinyl chloride resin 50 to 80% by weight.

  The average degree of polymerization of the suspension polyvinyl chloride resin is not particularly limited as long as it can be substantially molded. However, the average degree of polymerization is preferably in the range of 500 to 2000, and the average degree of polymerization is 700. The range of ˜1800 is more preferable. If the average degree of polymerization is less than 500, it is difficult to process because the viscosity at the time of melting is low.

Next, it is necessary to contain 1 to 20 parts by weight of a silicone copolymer and 10 to 50 parts by weight of a plasticizer with respect to 100 parts by weight of the polyvinyl chloride resin in order to impart stain resistance to the interior sheet. It is.
Therefore, this point will be described in detail below.

  The silicone copolymer may be a copolymer with various organic resins copolymerizable with silicone. Examples of resins copolymerizable with silicone include acrylic resins, urethane resins, epoxy resins, polyester resins, fluororesins, polyimide resins, polycarbonate resins, and the like. One or more of these copolymerizable resins and silicone are used. A silicone copolymer is obtained by reacting. Of these, a silicone copolymer obtained by reacting any of an acrylic resin, a urethane resin, an epoxy resin, and a polyester resin with silicone is preferable because of its good compatibility with the vinyl chloride resin.

  As the structure of the silicone copolymer, a block copolymer in which silicone chains are arranged in a block form in a resin skeleton copolymerizable with silicone, and a silicone chain is arranged in a resin side chain copolymerizable with silicone, or Examples include graft copolymers in which a resin chain copolymerizable with silicone is arranged on the silicone side chain, preferably a graft copolymer, more preferably a graft in which the copolymerizable resin chain is arranged on the silicone side chain. It is a copolymer.

  In addition, a core-shell copolymer having a graft layer outside the silicone composite rubber can also be used as the silicone graft copolymer. Examples thereof include a silicone-acrylic composite rubber graft copolymer. Silicone-acrylic composite rubber-based graft copolymers are grafted with vinyl-based polymers such as methacrylic acid ester and acrylic acid ester on the outside of particulate composite rubber made of polyorganosiloxane and polyalkyl (meth) acrylate. Is.

  The addition amount of the silicone copolymer is 1 to 20 parts by weight with respect to 100 parts by weight of the vinyl chloride resin. The resin composition can be processed by a normal sheet molding method such as a calender molding method or an extrusion molding method, but if the addition amount of the silicone copolymer exceeds 20 parts by weight, the processability is lowered and the appearance of the molded sheet is reduced. If a defect occurs or if the amount is less than 1 part by weight, problems such as insufficient stain resistance occur. The addition amount that provides satisfactory sheet appearance and contamination resistance as an interior sheet is preferably 1 to 20 parts by weight, and more preferably 3 to 10 parts by weight.

  A normal plasticizer can be used as the plasticizer. For example, phthalate plasticizers such as DOP (di-2-ethylhexyl phthalate), DINP (diisononyl phthalate), DIDP (diisodecyl phthalate), DOA (di-2-ethylhexyl adipate), DIDA (diisodecyl adipate), etc. Aliphatic dibasic acids such as adipate plasticizers, sebacic acid ester plasticizers such as DOS (di-2-ethylhexyl sebacate), and azelaic acid ester plasticizers such as DOZ (di-2-ethylhexyl azelate) Ester plasticizers, phosphate ester plasticizers such as TCP (tricresyl phosphate), TPP (triphenyl phosphate), TXP (trixylenyl phosphate), and trimelli such as TOTM (tris-2-ethylhexyl-trimellitate) DOO ester plasticizers, polyester plasticizers, epoxy plasticizers, and the like sulfonate ester plasticizer. Examples thereof include a phthalate plasticizer having good compatibility with a vinyl chloride resin and a polyester plasticizer having a high molecular weight. The plasticizer may be used alone or in combination of a plurality of types.

  The addition amount of the plasticizer is 10 to 50 parts by weight with respect to 100 parts by weight of the vinyl chloride resin. When the added amount of the plasticizer exceeds 50 parts by weight, dirt easily adheres to the interior sheet, and the attached dirt cannot be removed by simple cleaning, and sufficient stain resistance cannot be obtained. If the amount is less than 10 parts by weight, it is difficult to process, and even if it can be processed, it is too hard and causes problems such as cracking and whitening during construction. The amount of the plasticizer added is preferably 10 to 40 parts by weight, and more preferably 20 to 40 parts by weight.

  A filler can be added to the interior sheet for the purpose of improving processability. Fillers include calcium carbonate, silica, plate fillers such as talc and mica, clays such as bentonite and calcined kaolin, metal oxides such as magnesium oxide and alumina, metal hydroxides such as magnesium hydroxide and aluminum hydroxide An inorganic filler such as a product can be used. In order to enhance the affinity with the vinyl chloride resin, the filler may be subjected to various surface treatments such as fatty acids and modified fatty acids.

  The addition amount of the filler is preferably 1 to 50 parts by weight with respect to 100 parts by weight of the vinyl chloride resin. When the added amount of the filler exceeds 50 parts by weight, the influence on the smoothness of the surface of the interior sheet is increased, and the surface roughness of the surface layer is increased, so that dirt is easily attached. If the amount is less than 1 part by weight, the effect of improving workability may not be obtained. The amount of filler added is preferably 5 to 30 parts by weight, more preferably 10 to 20 parts by weight. When a design layer such as a printed layer is provided below the surface layer, the filler is preferably added in an amount of 10 parts by weight or less because transparency that allows the design to be visually recognized is required.

  Further, the contamination resistance of the surface layer of the interior sheet varies depending on the particle size and shape of the filler to be added. Regarding the average particle diameter of the filler, in the case of the median diameter which is 50% of the cumulative particle size distribution by the laser diffraction method, the median diameter is preferably in the range of 2 μm to 10 μm. Moreover, in the case of the specific surface area diameter which is the average particle diameter converted from the specific surface area obtained by the BET method, the brain permeation method or the like, the specific surface area diameter is preferably in the range of 1 μm to 5 μm. The shape of the filler is preferably a plate shape. When processing resin compounds containing fillers, plate-like fillers are easier to orient in the flow direction of the resin compound being processed than spherical or indeterminate fillers. It is easy to exist. For this reason, the surface roughness of the sheet tends to be small, and it is difficult for dirt to adhere, and it is easy to remove dirt. Examples of the plate-like filler include talc and mica.

An acrylic polymer processing aid is preferably added to the interior sheet for the purpose of improving processability. Examples of the acrylic polymer processing aid include acrylic polymer processing aids such as methyl methacrylate-alkyl acrylate copolymers such as methyl methacrylate-butyl acrylate copolymers.
By adding an acrylic polymer processing aid, the rotational flow and degassing in the bank during roll molding and calendar molding are improved, and plate-out is suppressed, so that a sheet having a good appearance can be obtained.

In order to further prevent the interior sheet from being colored during processing, anions (PF6-, SbF6-, AsF6-) of β diketones and inorganic compounds containing elements of Groups 13, 15, and 17 of the periodic table are used. , ClO4−, BF4−, and the like) and a cation (Na +, Li +, Mg2 +, Ca2 +, Zn2 +, etc.) of an element of Group 1, Group 2, and Group 12 of the Periodic Table. It is preferable to add, and among these, a sodium perchlorate-based anti-coloring agent is particularly preferable. The addition amount of the coloring inhibitor is preferably 0.1 to 1 part by weight with respect to 100 parts by weight of the vinyl chloride resin.

  If necessary, stabilizers, antioxidants, UV absorbers, light stabilizers, UV shielding agents, antistatic agents, flame retardants, thickeners, surfactants, fluorescent agents, crosslinking agents, impact modifiers Other compounding agents generally added to the resin may be added.

  In the case where preliminary kneading is necessary for obtaining the interior sheet, a known apparatus usually used in thermoplastic resins can be used. For example, the composition of the present invention may be uniformly mixed with a high-speed stirrer, low-speed stirrer, Henschel mixer, etc., melt-mixed with a batch-type kneading mixer, Banbury mixer, kneader, extruder, etc., and immediately molded. Moreover, after melt mixing, it may be once pelletized and then molded.

  The interior sheet can be formed by a general sheet forming method. For example, a melt molding method such as a roll molding method, a calendar molding method, an extrusion molding method, and a press molding method, a coating method, and the like can be given. From the viewpoint of speed and thickness accuracy of the obtained sheet, a melt shaping method is preferred, and among these, a calender molding method is preferred.

  Concavities and convexities can be formed on the upper surface of the surface layer of the interior sheet by embossing or the like. By forming irregularities (warts), it is possible to increase the variation of the design, and antiviral improvement can be expected depending on the shape of the irregularities (warts).

  As a preferable form of fine irregularities formed on the upper surface of the surface layer of the interior sheet, the arithmetic average roughness Ra is 5 μm to 20 μm, more preferably 10 μm to 15 μm. Rather than the shape (sharp) where the independent convex portions are scattered, it is preferable in terms of antiviral properties and stain resistance that the convex portions and concave portions are smoothly continuous (broad) and have a fine and complicated curve. .

  The interior sheet has at least the above-mentioned surface layer on the outermost surface, and may be composed of a single layer or a multilayer structure composed of a plurality of layers. In addition, in the case of a multilayer structure, there are no particular restrictions on the layer to be laminated, and design layers such as the same polyvinyl chloride resin layer as the surface layer, other thermoplastic resin layers, various resin foam layers, printed layers, and colored layers A base material layer such as a woven fabric or a non-woven fabric can be laminated according to the intended use and required physical properties.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these Examples.

Specific substance names of each compounding agent used in Examples and Comparative Examples are as follows.
Vinyl chloride resin A-1: Suspension vinyl chloride resin Average polymerization degree 1000
Vinyl chloride resin A-2: Suspension vinyl chloride resin Average polymerization degree 1300
Vinyl chloride resin A-3: Vinyl chloride resin for paste Average polymerization degree 850
(Na content of sodium dodecylbenzenesulfonate 3.0% by weight)
Vinyl chloride resin A-4: Vinyl chloride resin for paste Average polymerization degree 850
(Na content of dodecylbenzenesulfonate 5.0% by weight)
Vinyl chloride resin A-5: Vinyl chloride resin for paste Average polymerization degree 850
(Na content of dodecylbenzene sulfonate 7.5% by weight)
Sulfonic acid surfactant B-1: Alkylbenzenesulfonic acid Na purity 90%
Plasticizer C-1: Di-2-ethylhexyl phthalate silicone copolymer D-1: Silicone-acrylic graft copolymer
(Acrylic resin chain placed on silicone side chain)
Silicone content 70%
Silicone copolymer D-2: Silicone-acrylic composite rubber graft copolymer filler E-1: Light calcium carbonate (fatty acid treatment)
Specific surface area diameter 1.5μm (BET method specific surface area conversion value)
Processing aid F-1: Acrylic polymer processing aid stabilizer G-1: Ba-Zn metal soap coloring inhibitor H-1: Sodium perchlorate

  The formulations of Examples and Comparative Examples shown in Tables 1 to 4 were kneaded for 5 minutes with a batch mixer set at 150 ° C. Thereafter, the sheet was formed into a sheet shape having a thickness of 0.35 mm with two rolls set at 180 ° C., and laminated on a backing layer made of a soft vinyl chloride sheet having a thickness of 1.7 mm to prepare an interior sheet. Each interior sheet was evaluated for antiviral properties, stain resistance, and processability. Moreover, the yellowness of the surface layer was measured.

  In the examples shown in Table 5, the formulation of Example 5 was kneaded for 5 minutes with a batch mixer set at 150 ° C. Next, the sheet was formed into a sheet shape having a thickness of 0.35 mm with a two-roll set to 180 ° C., and laminated on a backing layer made of a soft vinyl chloride sheet having a thickness of 1.7 mm to produce an interior sheet. Finally, it was embossed with a press molding machine to form fine irregularities on the surface. The surface roughness of the surface layer on which fine irregularities were formed was measured by the method described above. Each interior sheet was evaluated for antiviral and stain resistance.

<Antiviral properties>
The avian influenza virus A / whisling swan / Shimane / 499/83 (H5N3) strain was used as a test virus. (Hereinafter referred to as H5N3 strain).
The test virus solution was prepared by diluting the H5N3 strain grown in the chorioallantoic cavity of the developing chicken egg to 1.0 × 10 6 EID50 / 0.1 mL with sterile phosphate buffered saline (PBS; pH 7.2). Prepared.

  The interior sheet 5 cm × 5 cm produced in the examples and comparative examples described in Tables 1 to 4 is placed on a petri dish, and 0.22 ml of the test virus solution is placed on the interior sheet surface, and a 4 cm × 4 cm polyethylene film is placed thereon. The petri dish was capped and left in an incubator set at 20 ° C. for 1 hour. One hour later, the virus solution on the surface of the interior sheet was collected, diluted 10-fold with PBS, and 0.1 mL of the diluted virus solution was inoculated into the chorioallantoic cavity of 10-day-old chicken eggs using an injection needle. .

After inoculation, the embryonated chicken eggs were cultured at 37 ° C. for 2 days, and then the presence or absence of virus proliferation in the chorioallantoic cavity was determined by the hemagglutination test, and the virus titer (log 10 EID50 / 0.1 ml) was calculated by the method of Reed & Muench. .
In addition, the virus titer (log 10 EID50 / 0.1 ml) of the test virus solution before the test (before contacting the interior sheet) as a blank was calculated according to the above procedure, and the antiviral property of the interior sheet was determined by the virus in the virus solution before the test. Evaluation was made by subtracting the virus titer of the virus solution one hour after contacting the interior sheet from the titer. The larger this difference, the stronger the anti-viral properties of the interior sheet.

A: Difference between virus titer (before test) and virus titer (after 1 hour) is 4 or more ○: Difference between virus titer (before test) and virus titer (after 1 hour) is 3 or more and less than 4 △: Difference between virus titer (before test) and virus titer (after 1 hour) is 2 or more and less than 3 ×: Difference between virus titer (before test) and virus titer (after 1 hour) is less than 2

<Contamination resistance>
Put 6 standard rubber blocks in the Snell Capsule Tester described in JIS K 3920 (2009), set the sheet so that the surface layer is in contact with the rubber block, and rotate 5 minutes forward and 5 minutes reverse at 50 rpm. After rotating for 5 cycles, the sheet was taken out and the degree of adhesion of the heel mark was observed to evaluate the dirtiness. Further, the cleaning property was evaluated from the degree of adhesion of the heel mark after the contaminated surface was wiped with a dry cloth. Contamination resistance was evaluated from both aspects of dirtiness and cleanability.

Dirtiness ○: Almost no adhesion (a slight degree of adhesion)
Δ: Adherence ×: Vigorous adhesion

Cleanability ○: Dirt can be removed (dirt is not noticeable after cleaning)
△: Difficult to remove some dirt (There are noticeable dirt after cleaning)
X: Difficult to remove most of dirt

<Processability>
The roll processability when the sheet was formed with two rolls set at 180 ° C. was evaluated.
◎: Good ○: Can be processed without problems △: Somewhat bad, but processing is possible ×: Processing is impossible

<Yellowness>
The yellowness was determined according to JIS K 7373 (2006) using “SM Color Computer” manufactured by Suga Test Instruments Co., Ltd.

<Surface roughness of surface layer>
The surface roughness of the surface layer was determined according to JIS B 0601 (2001) using a “surface roughness shape measuring instrument” by Tokyo Seimitsu Co., Ltd.

As is clear from Tables 1 to 4, antiviral properties are imparted by adding a sulfonic acid surfactant, and contamination resistance can be improved by adding a silicone copolymer. I understand that. Further, when Example 21 and Example 22 are compared, Example 22 has a higher degree of polymerization of the suspension vinyl chloride resin, and can suppress a decrease in contamination due to an increase in the content of the sulfonic acid surfactant. I understand that. When Example 2 is compared with Example 11, the use of a vinyl chloride resin for paste containing a sulfonic acid surfactant has a lower yellowness, less coloration, and more effective antiviral properties. Is expressed. Moreover, when Example 13 and Example 16 are compared, it becomes easy to process by adding a filler.
In Table 5 above, it can be seen that the antiviral properties can be improved by changing the shape of the surface.

  According to the present invention, while having antiviral properties, dirt is difficult to adhere, and even if it adheres, the dirt can be removed by simple cleaning, and long-term maintenance is not required without regular maintenance such as antifouling treatment. It can be used for various buildings and vehicles, and is particularly suitable as an interior finishing material for public facilities such as hospitals, offices and schools, and vehicles such as buses and trains.

Claims (3)

An interior sheet having at least a surface layer, wherein the surface layer is 0.1 to 10.0 parts by weight of a sulfonic acid surfactant and 10 to 50 parts by weight of a plasticizer with respect to 100 parts by weight of a polyvinyl chloride resin. If, Ri Do from polyvinyl chloride resin composition containing a silicone-based copolymer 20 parts by weight, the surface layer of polyvinyl vinyl chloride resin is chloride paste resin 49-1 parts by weight of suspension chloride An interior sheet comprising 51 to 99 parts by weight of a vinyl resin . Before SL paste according to claim 1 polyvinyl chloride interior sheet according to the vinyl chloride resin is characterized by containing a sulfonic acid-based surfactant.   The polyvinyl chloride interior sheet according to claim 1 or 2, wherein the resin composition constituting the surface layer further contains 1 to 50 parts by weight of a filler.