Antibacterial paper and its manufacturing method

Abstract

To provide excellent antibacterial paper and a method for producing the same.SOLUTION: The excellent antibacterial paper including a layer containing a nonionic antibacterial agent and / or an amphoteric antibacterial agent and a fluorescent dye is provided.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to antibacterial paper and a method for producing the same. [Background technology]

[0002] Antibacterial paper with antibacterial properties is known. For example, Patent Document 1 describes paper to which an inorganic antibacterial agent such as antibacterial zeolite is added externally, and Patent Document 2 describes paper to which an antibacterial agent is added internally. Patent Document 3 also proposes the production of antibacterial paper using an aqueous solution of chlorhexidine gluconate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 09-003799 [Patent Document 2] Japanese Patent Application Publication No. 09-003800 [Patent Document 3] JP 2009-242299 A Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, a binder such as starch is applied to the surface of paper to improve the sizing property, printing properties, surface strength, etc. The present inventors have investigated externally coating an antibacterial agent onto paper in order to impart antibacterial properties to the paper, and have found that when an antibacterial agent is blended into a coating solution containing additives such as a fluorescent dye, thickening or aggregation occurs depending on the combination of the fluorescent dye and the antibacterial agent contained in the coating solution, making it difficult to produce antibacterial paper by externally coating.

[0005] In view of the above circumstances, an object of the present invention is to provide a technique for producing excellent antibacterial paper by coating with an antibacterial agent. [Means for solving the problem]

[0006] The inventors have conducted intensive research into the above-mentioned problems and have found that the use of a specific antibacterial agent has good compatibility with the fluorescent dye, and does not cause aggregation or precipitation of the coating liquid, making it possible to produce excellent antibacterial paper.

[0007] The present invention includes, but is not limited to, the following inventions. [1] A method for producing antibacterial paper, comprising applying a nonionic and / or zwitterionic antibacterial agent and a fluorescent dye to base paper. [2] The method according to [1], wherein a coating solution containing the antibacterial agent and the fluorescent dye is applied to a base paper. [3] The method according to [1] or [2], wherein the antibacterial agent comprises a surfactant. [4] The method according to any one of [1] to [3], wherein the fluorescent dye is anionic. [5] An antibacterial paper having a layer containing a nonionic antibacterial agent and / or a zwitterionic antibacterial agent and a fluorescent dye on a base paper. [6] The antibacterial paper described in [5], wherein the layer containing the antibacterial agent and the fluorescent dye is a clear coating layer containing starch. [7] The antibacterial paper described in [6], wherein the clear coating layer contains NaCl. [8] The antibacterial paper according to any one of [5] to [7], which is a wood-free paper having no pigment coating layer. [9] The antibacterial paper according to any one of [5] to [8], wherein the fluorescent dye is anionic. Effect of the Invention

[0008] According to the present invention, an excellent antibacterial paper and a manufacturing method thereof are provided. Furthermore, the antibacterial paper manufactured according to the present invention has a significantly improved fluorescence intensity due to the combined use of a fluorescent dye and a specific antibacterial agent, and a synergistic effect of the combined use of a specific antibacterial agent and a fluorescent dye has been confirmed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention relates to an antibacterial paper having an antibacterial layer provided on a base paper. The antibacterial paper according to the present invention has an antibacterial layer on the base paper, which contains a nonionic antibacterial agent and / or a zwitterionic antibacterial agent and a fluorescent dye, and is obtained by applying a surface treatment liquid (coating liquid) onto the base paper.

[0010] The antibacterial paper according to the present invention has antibacterial properties, and has an antibacterial activity value of about 3.0 or more as measured based on the antibacterial test method of JIS L 1902. However, since an antibacterial test measures the extent to which bacterial proliferation can be inhibited, if a sample has bacteriostatic (germicidal) properties to begin with, the inoculated bacteria may not propagate, resulting in a low antibacterial activity value, and therefore, in the present invention, antibacterial properties are considered to be present even when the viable bacteria count immediately after inoculation in the antibacterial test is less than 20.

[0011] In the present invention, a layer containing an antibacterial agent and a fluorescent dye is provided on the base paper, and the amount of coating can be adjusted, for example, by adjusting the viscosity of the surface treatment solution or the coating speed. That is, it is possible to make the coating solution penetrate into the inside of the paper more easily by lowering the viscosity using a surfactant or the like, or to make the coating solution remain on the paper surface by coating at a high speed. In one embodiment of the present invention, polysaccharides such as starch are applied to the surface of the paper to improve not only the surface strength of the paper but also its stiffness, and further, the polysaccharides can penetrate into the inside of the paper layers to an appropriate degree, thereby improving the interlayer strength.

[0012] The antibacterial paper obtained by the present invention can be used as it is for various purposes as a product without any restrictions, for example, printing paper, writing paper, book paper, newsprint, packaging paper, tissue paper, base paper for pigment coated paper, various information recording papers such as inkjet recording, thermal recording, carbonless copying, form paper, copy paper, and base paper thereof. Considering the use as printing paper, the gloss after printing of the antibacterial paper according to the present invention is preferably 40% or more, more preferably 50% or more, and even more preferably 60% or more. In a 10-point scale, 4 or more is good, and 7 or more is particularly good. In addition, from the viewpoint of suppressing trouble during printing, the interlaminar strength in the MD direction is preferably 90 gf / 15 mm or more, more preferably 100 gf / 15 mm or more, and even more preferably 110 gf / 15 mm or more.

[0013] The basis weight of the antibacterial paper according to the present invention is not particularly limited, but may be, for example, 25 to 500 g / m 2 , 35~300g / m 2 , 40~250g / m 2 In another embodiment, the basis weight of the antibacterial paper can be, for example, 45 to 100 g / m 2 It is also possible to use 50 to 90 g / m 2 55~80g / m 2 It is also possible to use the following.

[0014] The antibacterial paper according to the present invention preferably has a relative air permeability of 1.4 or more, more preferably 3.0 or more or 5.0 or more. The antibacterial paper according to the present invention also preferably has a CD breaking length of 3.0 km or more, more preferably 4.0 km or more or 4.5 km or more. If the relative air permeability or breaking length is too low, there is a risk of the paper tearing during the manufacture of the antibacterial paper.

[0015] The ash content of the antibacterial paper of the present invention can be set appropriately, for example, from 0.1% to 40% by weight, and preferably from 5% to 30% by weight. If the ash content is higher than 30% by weight, the filler in the paper may inhibit the bonding between the fibers, resulting in a risk of the paper lacking stiffness and strength. The ash content in the paper is measured in accordance with JIS-P8252.

[0016] In one embodiment, the antibacterial paper according to the present invention is an uncoated paper having no pigment coating layer, and may be an uncoated wood-free paper. Base paper The base paper used in the present invention comprises a pulp raw material. There is no particular restriction on the pulp raw material used, and in addition to wood pulp, bamboo pulp, linter pulp, non-wood pulp such as hemp, bagasse, kenaf, esparto grass, straw, etc., semi-synthetic fibers such as rayon and acetate, synthetic fibers such as polyolefin, polyamide, polyester, etc. can be used. Specifically, those generally used as raw materials for papermaking, such as mechanical pulp (MP), deinked pulp (DIP, also called recycled paper pulp), hardwood kraft pulp (LKP), softwood kraft pulp (NKP), etc., can be suitably used, and one or more of these types are appropriately used in combination. These pulps may be unbleached pulps that are not bleached, or bleached pulps that are bleached by one or several means. Examples of mechanical pulp include groundwood pulp (GP), refined groundwood pulp (RGP), thermomechanical pulp (TMP), chemi-thermomechanical pulp (CTMP), chemi-ground pulp (CGP), and semi-chemical pulp (SCP). There is no particular limitation on the deinked pulp, so long as it is made from sorted waste paper such as fine paper, medium-quality paper, low-quality paper, newspapers, flyers, and magazines, or unsorted waste paper in which these are mixed, or office waste paper including copy paper, thermal paper, and carbonless paper, confidential waste paper, and paper cups. Cellulose nanofibers, cellulose nanofibrils, microfibril cellulose, microcrystalline cellulose, cellulose powder, and the like can also be used. There is no particular limitation on the base paper used in the present invention, and examples of the base paper that can be used include copy paper, newsprint, medium-quality paper, liner, and core base paper. In one embodiment, the base paper according to the present invention is fine paper, and only chemical pulp is used as the pulp for the base paper.

[0017] Various internal additives may be added to the base paper used in the present invention within the range that does not impair the effects of the present invention. Examples of the internal additives include, but are not limited to, inorganic chemicals such as aluminum sulfate (aluminum sulfate), polyaluminum chloride, sulfuric acid, hydrochloric acid, sodium hydroxide, and sodium bicarbonate; organic chemicals such as polyacrylamide polymers, polyvinyl alcohol polymers, oxidized starch, esterified starch, cationic starch, and other various modified starches, styrene-butadiene copolymers, latex, and vinyl acetate adhesives; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; internal paper strength enhancers such as urea-formaldehyde resin and melamine-formaldehyde resin; internal sizing agents such as rosin-based sizing agents, AKD-based sizing agents, ASA-based sizing agents, petroleum-based sizing agents, and neutral rosin sizing agents; aluminum sulfate, retention aids, retention aids, UV inhibitors, color inhibitors, drainage improvers, coagulants, bulking agents, pH adjusters, slime control agents, colorants (dyes, pigments), and fluorescent dyes such as coumarin derivatives, pyrazoline derivatives, stilbene derivatives, and azole derivatives. Furthermore, various cellulose nanofibers and fine fiber cellulose may be used as internal additives.

[0018] The base paper used in the present invention can be filled with a commonly used filler, for example, one or more inorganic or organic fillers. Examples of inorganic fillers include heavy calcium carbonate, light calcium carbonate, calcium sulfite, gypsum, talc, kaolin, engineered kaolin, calcined kaolin, white carbon, amorphous silica, delaminated kaolin, diatomaceous earth, magnesium carbonate, titanium dioxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, papermaking sludge, and recycled inorganic particles from deinking floss. Examples of organic fillers include urea-formalin resin, vinyl chloride resin, polystyrene resin, urea / formalin resin, melamine resin, styrene / butadiene copolymer resin, phenol resin, and plastic hollow particles.

[0019] The base paper of the present invention can be made by a known method. For example, a paper stock obtained by mixing the above-mentioned raw materials is appropriately diluted, and after removing foreign matter with a screen or cleaner as necessary, the diluted paper is sprayed onto a papermaking wire from the head box of a papermaking machine to form a wet paper. The base paper of the present invention can be made by various papermaking machines, such as a Fourdrinier type, a Cylinder type, a Cylinder multi-cylinder type, a Short wire type, or a Twin-wire type papermaking machine. Examples of the Twin-wire papermaking machine include a Gap former and an On-top former. In addition, the base paper may be made by using a crescent former type or a Yankee dryer type papermaking machine. The conditions in the pressing process and the drying process after papermaking can be appropriately adjusted.

[0020] The conditions for making the base paper may be neutral or acidic. Specifically, in the present invention, the pH of the stock during papermaking is preferably 3.0 to 9.0, and more preferably 4.0 to 8.0.

[0021] Coating (painting) In the present invention, in order to impart antibacterial properties, a layer (antibacterial layer) containing at least a nonionic antibacterial agent and / or a zwitterionic antibacterial agent and a fluorescent dye is provided on the base paper. In the present invention, the coating amount (coating amount) of the antibacterial layer is not particularly limited, but for example, it is 0.1 to 10 g / m on both sides. 2 can range from 0.5 to 6.0 g / m 2 is preferably 1.0 to 3.0 g / m 2 If the coating amount is too large, the absolute amount of water increases, which may increase the drying load and make drying insufficient.

[0022] (Antibacterial agent) In the present invention, an antibacterial agent is applied onto the base paper, and a nonionic antibacterial agent and / or a zwitterionic antibacterial agent is used as the antibacterial agent. The nonionic antibacterial agent and / or the zwitterionic antibacterial agent may be used alone or in combination of two or more antibacterial agents. In the present invention, the antibacterial agent means an agent that can impart antibacterial properties, and commercially available antibacterial agents, bactericides, disinfectants, etc. can be used. For example, an agent that has not only antibacterial properties but also antiviral properties can be used as the antibacterial agent.

[0023] Preferred antibacterial agents include surfactant-based antibacterial agents, and examples of nonionic surfactant antibacterial agents include glycerol fatty acid esters and polyoxyethylene alkyl ethers, and examples of amphoteric surfactant antibacterial agents include alkyldiaminoethylglycine chloride and alkylpolyaminoethylglycine, etc. Commercially available surfactant-based antibacterial agents include, for example, Anhithol 20N, Emulgen 106, Amolden V-500HP, Poem M-200, Poem DL-100, Mydol 10, Mydol 12, Air heal, Tego 51 (registered trademark), and LAG (registered trademark), etc.

[0024] In the present invention, organic antibacterial agents and inorganic antibacterial agents can be used within the scope of the present invention, and hybrid type antibacterial agents of organic and inorganic antibacterial agents can also be used.

[0025] Examples of organic antibacterial agents include ethylene oxide, glutaraldehyde, orthophthalaldehyde, cresol, chitosan, hinokitiol, mustard extract, iodine-based agents such as povidone-iodine, biguanide-based agents such as chlorhexidine, dye-based agents such as acrinol, polyphenol-based, benzimidazole-based, phthalimide-based, isothisolone-based, pyridine-based, and nitrile-based antibacterial agents.

[0026] As the inorganic antibacterial agent, for example, a silver-based antibacterial agent, a copper-based antibacterial agent, or a zinc-based antibacterial agent can be used, and from the viewpoint of safety, a silver-based antibacterial agent is preferred. As the silver-based antibacterial agent, there is no particular limitation as long as it is an inorganic compound carrying silver ions, and specifically, inorganic adsorbents such as activated carbon, activated alumina, and silica gel, and inorganic ion exchangers such as zeolite, hydroxyapatite, zirconium phosphate, titanium phosphate, and potassium titanate can be mentioned. As the copper-based antibacterial agent, there is no particular limitation as long as it is an inorganic compound carrying copper ions, and specifically, inorganic adsorbents such as activated carbon, activated alumina, and silica gel, and inorganic ion exchangers such as zeolite, hydroxyapatite, zirconium phosphate, titanium phosphate, and potassium titanate can be mentioned. As the zinc-based antibacterial agent, there is no particular limitation as long as it is an inorganic compound carrying zinc ions, and specifically, inorganic adsorbents such as activated carbon, activated alumina, and silica gel, and inorganic ion exchangers such as zeolite, hydroxyapatite, zirconium phosphate, titanium phosphate, and potassium titanate can be mentioned. When a zeolite-based antibacterial agent is used, antibacterial zeolite obtained by substituting a part of the ion-exchangeable metals of zeolite with at least one metal selected from silver, copper and zinc is preferably used.

[0027] Commercially available inorganic antibacterial agents include, for example, Silver Bread, Cozy Pack Air, AG Alpha (registered trademark) CF-01, AG Alpha (registered trademark) CF-04, Novalon, Kesmon, Allerim Remove, MP-102SVC13, Silver Ace, Zeomic, Lock-3, and Ion Pure.

[0028] (Fluorescent dye) In the present invention, the above antibacterial agent and a fluorescent dye are used in combination. In the present invention, various fluorescent dyes can be used, such as 4,4'-diaminostilbene-2,2'-disulfonic acid derivatives, 4,4-bis{2-sodiumsulfanyl-4-di(hydroxyethyl)amino-1,3,5-triazinyl-(6)-amino}stilbene-2,2-disulfonic acid sodium, umbelliferone, 4,4'-bis(2-sulfonatostyryl)biphenyl disodium, 4'-(2-cyanostyryl)-4-stilbenecarbonitrile, 4,4'-bis(2-benzoxazolyl)stilbene, 1,2-bis(5-methylbenzoxazol-2-yl)ethene, Examples of fluorescent dyes include acenaphthylene, 1,4-bis(2-benzoxazolyl)naphthalene, 4,4'-stilbenedicarboxylic acid, 4,4'-bis(5-methyl-2-benzoxazolyl)stilbene, 2,5-bis(5-tert-butyl-2-benzoxazolyl)thiophene, o-(chloromethyl)benzonitrile, 4,4'-bis(diethylphosphonomethyl)biphenyl, 2,5-thiophenedicarboxylic acid, 4-tert-butyl-2-nitrophenol, 2,5-bis(benzoxazol-2-yl)thiophene, and benzoxazole derivatives, and anionic fluorescent dyes are preferred. When using a fluorescent dye, the solids concentration in the surface treatment solution is preferably 0.01 to 5.0% by weight, more preferably 0.03 to 1.5% by weight.

[0029] The weight ratio of antibacterial agent / fluorescent dye can be, for example, 0.1-1000, preferably 1-100, and may be 2-80 or 3-60. (glue) In the present invention, a surface coating liquid containing a polysaccharide such as starch as an adhesive (binder) can be applied to the base paper, thereby imparting surface strength, water resistance, printability, and other properties to the paper.

[0030] The adhesive containing a polysaccharide is not particularly limited, but may include starch, cellulose, chitin, glycogen, agarose, pectin, etc. As for the starch, for example, corn starch, tapioca starch, potato starch, wheat starch, rice starch, etc. can be suitably used.

[0031] When the antibacterial agent and adhesive are applied together, the solids weight ratio of the antibacterial agent to the adhesive can be, for example, 2:1 to 1:200, preferably 1:1 to 1:150, and may be 1:2 to 1:100 or 1:3 to 1:50.

[0032] In the present invention, starch modified in various ways by known methods may be used. Modification methods include, for example, enzyme modification using α-amylase, esterification, cationization, acetylation, aldehyde conversion, hydroxyethylation, and other treatments. Esterification includes acetate esterification and phosphate esterification, and etherification includes carboxy etherification and hydroxy etherification. In order to highly exhibit the retrogradation stability improving effect of the present invention, it is preferable to use self-modified starch that is modified in a paper mill using acetylated tapioca starch as a raw material to reduce the viscosity, particularly APS-modified starch that is thermochemically modified by adding ammonium persulfate (APS) as an oxidizing agent, or enzyme-modified starch that is hydrolyzed using α-amylase. Self-modified starch that is modified in a paper mill allows easy adjustment of the viscosity at the manufacturing site and is also advantageous in terms of cost.

[0033] The adhesive used for the surface treatment is not particularly limited as long as it contains at least a polysaccharide, but other than starch, for example, cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, cellulose nanofiber, fine fiber cellulose, guar gum, xanthan gum, gum arabic, dextrin, alginic acid, hyaluronic acid, xylan, glucomannan, carrageenan, polyacrylamide, polyvinyl alcohol, carboxyl-modified polyvinyl alcohol, acetoacetylated polyvinyl alcohol, and other modified alcohols, latex, styrene-butadiene copolymers, polyvinyl acetate, vinyl chloride-vinyl acetate copolymers, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid esters, and the like may be used alone or in combination. In the present invention, the proportion of polysaccharides such as starch in the adhesive in the antibacterial layer is preferably 50% or more. More preferably, it is 80% or more. If it is less than 50%, the viscosity of the surface treatment solution may decrease, which may cause problems such as deterioration in strength and stiffness, and the cost may also increase.

[0034] Furthermore, in the surface treatment liquid (coating liquid) of the present invention, various auxiliary agents such as salts such as sodium chloride, dispersants, thickeners, water retention agents, defoamers, water resistance agents, colorants, and conductive agents may be appropriately used as necessary.

[0035] The device (coater) for applying the surface treatment liquid is not particularly limited, and known devices can be used. As the coater, a pond type size press, a film transfer type gate roll coater or a lot metering size press, as well as a blade coater, a spray coater, a curtain coater, etc. can be used. In addition, so-called calendar sizing can be performed in which application is performed using an applicator or spray in a calendar or super calendar. Furthermore, the coating liquid can be sprayed and applied in front of the Yankee dryer.

[0036] In the present invention, other layers may be provided in addition to the layer containing the antibacterial agent, i.e., for example, a clear coating layer or a pigment coating layer may be provided in addition to the layer containing the polysaccharide and the antibacterial agent. After the clear coating layer is applied to the base paper, the paper may be passed through a known finishing device, such as a supercalender, gloss calender, soft calender, or high-temperature soft nip calender, to perform product finishing, or may be left untreated or may be bypassed. EXAMPLES

[0037] The present invention will be illustrated below with specific examples, but it is not intended that the present invention be limited to the following examples. In this specification, unless otherwise specified, "parts" and "%" are by weight, and numerical ranges are described as including their endpoints.

[0038] Experiment 1. Check compatibility Antibacterial agents with different ionic properties were mixed with fluorescent dyes to confirm their compatibility. Specifically, 5 ml of the undiluted fluorescent dye and 5 ml of the antibacterial agent diluted to 5% were mixed in a 20 ml vial, capped, and vigorously shaken by hand for 30 seconds. (Antibacterial agent) Cationic surfactant (Sanisol B-50, Kao, solids concentration: 50%) Anionic surfactant (Neopelex G-15, Kao, solids concentration: 16%) · Amphoteric surfactant (Amphitol 20N, Kao, solids concentration: 35%) Nonionic surfactant (Emulgen 106, Kao, solids concentration: 94%) (Fluorescent dye) Fluorescent dye A (Blancofer Z-NSP, Bayer, anionic, concentration: 55%) Fluorescent dye B (Sunwhite BUL-TC, Sunrise Chemical anionic, concentration: 67%) After shaking, the mixture was allowed to stand for 24 hours, and the compatibility was evaluated visually based on the following criteria. (Compatibility Evaluation Criteria) Good: Clear or uniformly dispersed × (bad): Precipitation or aggregation occurs, resulting in a paste or gel-like substance.

[0039] [Table 1]

[0040] When cationic antibacterial agents were mixed with fluorescent dyes, gel-like white aggregates were formed. When anionic antibacterial agents were mixed with fluorescent dyes, white aggregates and precipitation occurred. On the other hand, when nonionic or zwitterionic antibacterial agents were mixed with fluorescent dyes, the properties of the mixture were good even after 24 hours of mixing.

[0041] Experiment 2. Production and evaluation of antibacterial paper (1) Manufacturing of antibacterial paper The raw materials were mixed in the following ratio to prepare 200 g of coating solution. Specifically, in a 500 mL container, the raw materials were mixed with water (ion-exchanged water) whose liquid temperature was adjusted to 40°C, and the mixture was stirred with a spatula for 3 minutes to prepare the coating solution.

[0042] [Table 2-1]

[0043] [Table 2-2]

[0044] Next, we used base paper for fine paper (basis weight: about 60 g / m2) that was neither pigment coated nor clear coated. 2 Each coating solution was applied to one side of a sheet of paper (neutral paper) using a wire bar, and then the paper was air-dried for a day and night to produce high-quality paper. (2) Evaluation of antibacterial paper The coated surface of the produced fine paper was evaluated as follows: When evaluating, the paper was left to stand overnight in a constant temperature and humidity room (25°C, relative humidity: 50%) to adjust the humidity. (a) Antibacterial activity Based on the antibacterial test method of JIS L1902, a 2.8 cm x 2.8 cm fine paper sample was used as the test piece. The test liquid containing Staphylococcus aureus (test bacteria concentration: 1.0 x 10 5 ~3.0×10 5 After inoculating 0.2 mL of the bacteria (CFU / mL) onto the surface of the test specimen, the specimen was cultured at 37°C for 18 to 24 hours. Immediately after inoculation and after culture, 20 mL of washout liquid was added to wash out the test bacteria from the specimen, the number of live bacteria in the washout liquid was measured, and the antibacterial activity value (A) was calculated by the following formula. Washed cotton cloth (cotton No. 3-1) was used as a control sample (JIS L0803).

[0045]

number

[0046] (b) Opacity Using a whiteness spectrophotometer (CMS-35SPX), the whiteness of the samples was measured by stacking the samples so that no bleed-through occurred. A light trap was also set up and measurements were taken in the same way when only one sample was sandwiched between the samples. The opacity was calculated from the measured value of UV-in "Y" based on the following formula.

[0047] Opacity (%) = UV-in Y (one sample) ÷ UV-in Y (multiple samples) (c)ISO whiteness The brightness was measured using a whiteness spectrophotometer (CMS-35SPX). Whiteness was evaluated using the UV-in ISO-B value. (d) Color tone Hue was measured using a whiteness spectrophotometer (CMS-35SPX) (C light source, 2° field of view). Hue was evaluated using the UV-cut L*, a*, and b* values. (e) Fluorescence intensity The brightness was measured using a whiteness spectrophotometer (CMS-35SPX). Fluorescence intensity was evaluated using the UV-cut F1 value.

[0048] [Table 3-1]

[0049] [Table 3-2]

[0050] Coating solutions containing cationic or anionic antibacterial agents and fluorescent dyes caused aggregation or precipitation (Samples A3-A4, B3-B4). When coating solutions that had caused aggregation or precipitation were applied with a wire bar, antibacterial activity could be imparted to fine paper, but the fluorescence intensity could not be improved as in the examples of the present invention (Samples A5-A6, B5-B6).

[0051] On the other hand, when a coating solution containing a zwitterionic or nonionic antibacterial agent and a fluorescent dye was used based on the present invention, no aggregation or precipitation occurred in the coating solution, and the coating solution could be applied smoothly (Samples A5 to A6, B5 to B6).

[0052] In addition, when the fluorescent dye and the antibacterial agent were used in combination according to the present invention, the fluorescence intensity of the fine paper was significantly improved, and it was considered that a synergistic effect was produced by using the fluorescent dye and the antibacterial agent in combination. * The value rises, b * The value was reduced, and antibacterial paper with higher whiteness and less dullness was obtained.

Claims

1. A method for producing antimicrobial paper, comprising applying a nonionic and / or zwitterionic antimicrobial agent and an anionic fluorescent dye to a base paper.

2. The method of claim 1 , wherein a coating solution containing the antimicrobial agent and the fluorescent dye is applied to a base paper.

3. The method of claim 1 or 2, wherein the antimicrobial agent comprises a zwitterionic surfactant.

4. A method according to any one of claims 1 to 3, wherein the weight ratio of the antibacterial agent to the fluorescent dye (antibacterial agent / fluorescent dye) is 0.1 to 1000.

5. An antibacterial paper having a layer containing a nonionic antibacterial agent and / or a zwitterionic antibacterial agent and an anionic fluorescent dye on a base paper.

6. The antibacterial paper according to claim 5, wherein the layer containing the antibacterial agent and the fluorescent dye is a clear coating layer containing starch.

7. The antibacterial paper according to claim 6, wherein the clear coating layer contains NaCl.

8. The antibacterial paper according to any one of claims 5 to 7, which is a wood-free paper having no pigment coating layer.

9. An antibacterial paper described in any of claims 5 to 8, wherein the layer containing the antibacterial agent and the fluorescent dye contains an adhesive, and the solids weight ratio of the antibacterial agent to the adhesive is 2:1 to 1:200.

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