KR102435553B1 - Antibacterial cast coated paper surface sizing composition containing copper powder - Google Patents

Abstract

The present invention relates to a surface sizing composition capable of producing cast coated paper having excellent antibacterial effect as well as excellent optical quality of the treated paper by preventing oxidation of copper powder. The surface sizing composition according to the present invention comprises starch, copper powder, and a surface sizing agent, wherein the surface sizing agent is an alkenyl ketone dimer.

Description

Surface sizing composition of antibacterial cast coated paper containing copper powder {ANTIBACTERIAL CAST COATED PAPER SURFACE SIZING COMPOSITION CONTAINING COPPER POWDER}

The present invention relates to a surface sizing composition for antibacterial cast coated paper comprising copper powder.

As the industry gradually develops, environmental pollution and abnormal climates are increasing, and the emergence of new viruses is becoming more frequent.

Antibacterial substances commonly used include silver (Ag) or copper (Cu) particles, and a method of coating them on the surface of a product is common. However, when the particles are coated on the surface as described above, there is a problem in that the particles are peeled off after a certain period of time and thus do not exhibit their proper function. In addition, in the case of paper requiring writing or printing on the surface, when the above-mentioned particles are simply coated on the surface, there is a problem in that the quality is deteriorated in writing or printing.

Therefore, rather than simply coating the materials on the outside of the paper to introduce silver or copper particles, etc. in order to impart antibacterial properties to the paper, it is contained in the drug (eg, internal/external size agent) used during the manufacturing process of paper. Technological development for a method of further including particles is being made.

In the paper manufacturing process, internal addition size refers to a method of internally adding a chemical such as a sizing agent, adding an internal addition sizing agent to the pulp slurry, and adding an internal addition sizing agent to the inside of the paper at the same time as papermaking. External size is also referred to as surface size, and it is a method of externally adding chemicals such as a size agent. it means.

Typical sizing agents for internal addition include alkylketene dimer (AKD) and alkenyl succinic anhydride (ASA), and typical external sizing agents (also called surface sizing agents) include styrene/maleic acid copolymers and styrene/acrylic acid copolymers. is being used as

However, in the case of a generally used externally added size agent, as described above, for the purpose of improving the miscibility with the paper material, the non-polar material is modified with polarity such as acrylic acid (-COOH) treatment. When copper particles are included in the retained material, the copper particles react with a material having an acid group and are oxidized to cause a problem of discoloration to gray or black. This causes a serious problem of quality degradation in paper products in which color, that is, optical quality, is one of the very important quality factors to the extent that several product groups such as white, white, and off-white are produced according to colors observed with the naked eye. In particular, in the case of cast coated paper, when a problem of color deterioration such as discoloration of paper occurs due to the characteristics of single-sided paper, as described above, the non-coated back surface is directly exposed to the user, so that the user can feel the deterioration of the paper quality, Even if the coated surface is coated using a pigment, the discolored base paper color is not completely hidden, so there is still a problem in that the quality of the paper is deteriorated.

Republic of Korea Patent Registration No. 10-1073946 (2011.10.10.)

An object of the present invention is to provide a surface sizing composition that has excellent antibacterial effect by including copper powder, and prevents oxidation of copper powder, and thus also has excellent optical quality of paper.

In addition, it is an object of the present invention to provide a manufacturing method for preparing the surface sizing composition.

In addition, an object of the present invention is to provide a method for producing a cast coated paper capable of producing a cast coated paper having an excellent antibacterial effect by using the surface sizing composition.

The surface sizing composition of the present invention for achieving the above object includes starch, copper powder and a surface sizing agent, wherein the surface sizing agent is an alkenyl ketone dimer.

In addition, the method for preparing the surface sizing composition of the present invention includes a first step of gelatinizing starch to a concentration of 20 to 35%; a second step of diluting the gelatinized starch to a concentration of 5 to 20%, adding a surface sizing agent to the diluted starch, and adding one or more from the group consisting of a starch curing agent, a dye, and an additive; and a third step of finally adding copper powder.

In addition, the manufacturing method of the cast coated paper of the present invention includes a size press step of applying the surface sizing composition to one side or both sides of the base paper; and a cast coating step of performing a cast coating on one surface of the size-pressed base paper.

The surface sizing composition of the present invention has an effect of producing a cast coated paper excellent in antibacterial activity by including copper powder. In addition, by using the alkenyl ketone dimer as a surface sizing agent, there is an effect of preventing discoloration due to oxidation of copper powder and producing cast coated paper having excellent optical quality of papermaking.

In addition, the method for producing the surface sizing composition of the present invention has the effect of producing the surface sizing composition comprising copper powder.

In addition, the surface size press method of the present invention has the advantage of being able to manufacture a cast coated paper that exhibits an antibacterial effect evenly throughout, and has the advantage of being easily applicable to packaging of pharmaceuticals, cosmetics, and the like.

1 is a view of a cast coating surface of a cast coated paper using the sizing composition of Examples and Comparative Examples.
2 is a view of the rear surface of the cast coated paper using the sizing composition of Examples and Comparative Examples.

In the present invention, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

Hereinafter, the present invention will be described in more detail.

<surface sizing Composition>

The surface sizing composition according to an aspect of the present invention includes copper powder, a surface sizing agent and starch, wherein the surface sizing agent is an alkenyl ketone dimer (AnKD), whereby the copper powder has excellent antibacterial effect There is an advantage. In addition, by including the alkenyl ketone dimer as a surface sizing agent together with the copper powder to prevent discoloration due to oxidation of the copper powder, there is an advantage in that a cast coated paper having excellent optical quality and antibacterial activity can be manufactured.

copper powder

Copper powder is a key component for introducing antimicrobial activity to the cast coated paper in the present invention, and according to an embodiment of the present invention, the content of the copper powder is 1 to 10 parts by weight, preferably based on 100 parts by weight of the starch. It may be included in 3 to 7 parts by weight. When the content of the copper powder is less than the above range, the antibacterial power imparted to the cast coated paper may be reduced. Also, as the copper powder discolors, the optical quality of the cast coated paper may be deteriorated.

According to an embodiment of the present invention, the copper powder may have a particle diameter of 1 μm to 6 μm, preferably 2 μm to 4 μm, and a spherical shape. When the particle size of the copper powder is included within the above range, there is an advantage that compatibility with other components (eg, dyes, etc.) that may be included together can be improved. If it is less than the above range, the antibacterial power of the cast coated paper may be reduced, and as the particle size of the copper powder is smaller, the manufacturing cost tends to be improved. Accordingly, the manufacturing cost of the cast coated paper may be improved, and exceeding the above range In this case, the miscibility is lowered due to the size difference with other components such as dyes included therewith, so that the quality of the cast coated paper is not smooth when applied to the cast coated paper. There is a possibility that it may not be applied evenly to the front surface.

surface size made

The surface sizing composition according to an aspect of the present invention includes an alkenyl ketone dimer (AnKD) as a surface sizing agent together with the copper powder. As described above, in the present invention, discoloration of the copper powder can be prevented by using the alkenyl ketone dimer as a surface sizing agent together with the copper powder, thereby improving the optical quality of the cast coated paper.

Specifically, generally used surface sizing agents use those having an acid group, and as an example, a styrene/maleic acid-based copolymer, a styrene/acrylic acid-based copolymer, and the like are used. This is because the materials used as raw materials for the surface sizing agent are hydrophobic and non-polar materials because they are basically materials for imparting water resistance to paper, whereas most paper materials such as cellulose (pulp, starch) are water-soluble and polar materials. This is because, for the purpose of improving the miscibility with the raw material, the non-polar surface sizing agent raw material is treated with an acidic substance such as acrylic acid to modify the polarity.

However, when the surface sizing agent having an acid group as described above is used together with the copper powder, there is a problem in that the copper powder reacts with the acid group in the surface sizing agent to be oxidized and the color is changed to gray or black. Such discoloration of copper powder soon causes the same problem in the optical quality of paper. In the case of paper products, color, that is, optical quality is very important to the extent that several product groups such as white, white, white, and off-white are produced separately. recognized as one of the elements. Therefore, when discoloration occurs due to oxidation of copper powder, it causes serious problems in the optical quality of paper. In particular, in the case of cast coated paper, when a problem of color deterioration such as discoloration of paper occurs due to the characteristics of single-sided paper, as described above, the non-coated back surface is directly exposed to the user, so that the user can feel the deterioration of the paper quality, Even if the coated surface is coated using a pigment, the discolored base paper color is not completely hidden, so there is still a problem in that the quality of the paper is deteriorated.

Therefore, the surface sizing composition of the present invention uses an alkenyl ketene dimer that does not have an acid group together with copper powder as a surface sizing agent, thereby preventing discoloration of copper powder, thereby reducing the optical quality of paper, especially cast coated paper. As a result, there is an advantage in that a cast coated paper having excellent optical quality can be manufactured by preventing it from being formed.

In addition, the surface sizing composition of the present invention includes an alkenyl ketene dimer having a structure similar to an alkyl ketene dimer (AKD) used as an internal addition sizing agent as a surface sizing agent, thereby reducing the amount of alkyl ketene dimer input in the internal addition sizing process. have. Specifically, in the case of water used in the papermaking process, it is common to repeat reuse while continuously purifying it. However, for internal addition sizing, an alkyl ketene dimer is used as an internal addition sizing agent. In this case, some alkyl ketene dimers that have not been fixed in papermaking remain in the water, which causes foaming, facility contamination, reduced workability and/or Problems such as mixing of foreign substances in paper occur.

However, in the present invention, by using an alkenyl ketene dimer having a structure similar to that of an alkyl ketene dimer as a surface sizing agent, there is an advantage of reducing the content of the alkyl ketene dimer during the internal addition sizing process, which results in contamination of water used during the papermaking process There is an advantage in that the stabilization of water is secured by preventing

According to an embodiment of the present invention, the surface sizing agent may be included in an amount of 1 to 10 parts by weight, preferably 3 to 6 parts by weight, based on 100 parts by weight of the starch. If the content of the surface sizing agent is less than the above range, the water resistance of the cast coated paper may be lowered due to not functioning properly as a surface size. The coated paper may not be accepted, and this may cause problems such as poor drying, and process problems such as equipment contamination, deterioration of workability, or mixing of foreign substances due to continuous process circulation of the hydrophobic surface sizing agent may occur.

starch

The starch is one of the representative materials generally used as a surface sizing agent, and has an advantage of being inexpensive and easily dispersed in water to facilitate processing. In addition, the starch has advantages such as improving the surface strength of the cast coated paper, preventing tearing of fibers by acting as an anti-seize, etc., and improving printing workability.

In the present invention, the starch refers to all types of starch, including natural starch derived from plants, physically or chemically modified starch, and the like. For example, the natural starch includes corn, waxy corn, potato, sweet potato, wheat, rice , tapioca, sago, waxy maize, sorghum, etc. may include starch derived from various plants, and the starch may be obtained from above or underground parts of the plants. In addition, the natural starch may mean unmodified starch. The modified starch may refer to starch modified by etherification, esterification, ethoxylation, oxidation, acid treatment, oxidation esterification, oxidation etherification, enzyme treatment, etc. of the unmodified starch, but is not limited thereto. However, each of these modification methods may be applied without limitation to conventional methods known in the art. As an example, the starch may be oxidized starch.

The surface sizing composition according to an embodiment of the present invention may further include one or more selected from the group consisting of a starch curing agent, a dye, and an additive.

starch hardener

The starch curing agent is configured to harden the starch, and through this, effects such as improving the surface strength of the cast coated paper can be derived, and by accelerating the starch curing, the starch is delayed by delaying absorption into the cast coated paper paper layer. By distributing it on the surface of the cast coated paper, water resistance can be further improved.

The type of the starch curing agent is not particularly limited in the present invention, and a conventional starch curing agent known in the art may be used without any particular limitation, but may include, for example, oxalaldehyde and ethanedial components.

The content of the starch curing agent is not particularly limited in the present invention, but may be 0.1 to 3 parts by weight, preferably 0.3 to 1 parts by weight, based on 100 parts by weight of the starch. When the above range is satisfied, the curing rate of the sizing composition applied to one or both surfaces of the cast coated paper making layer is appropriately controlled, thereby improving process efficiency and thereby improving productivity.

dyes

The dye is for imparting a color to the cast coated paper, and the type thereof is not particularly limited in the present invention, but may include, for example, a fluorescent dye and/or a colored dye.

The fluorescent dye is not particularly limited in the present invention, but for example, azoles, biphenyls, coumarins, furans, ionic brighteners, naphthalimides, pyrazenes, substituted stilbens, and salts of compounds including alkali metal salts, alkaline earth metal salts, transition metal salts, organic salts and ammonium salts thereof, each alone or Two or more types may be used.

The colored dye may be appropriately selected as needed, and the type thereof is not particularly limited in the present invention, but may include a purple dye and/or a blue dye as an example.

Although not limited thereto, the purple or blue dye may include, for example, a xanthene-based dye; triarylmethane dyes; tetraazaporphyrin-based dyes; And it may be at least one selected from the group consisting of anthraquinone-based dyes.

The xanthene-based dye may refer to a dye including a compound having a xanthene skeleton in a molecule, and the type is not particularly limited in the present invention, and may be purchased and used commercially or may be used synthetically.

The triarylmethane-based dye may refer to a dye containing a compound having a triarylmethane skeleton in a molecule, for example,

C.I. Acid Violet 15, 16, 17, 19, 21, 23, 24, 25, 38, 49, 72;

C.I. Acid Blue 1, 3, 5, 7, 9, 11, 13, 15, 17, 22, 24, 26, 34, 38, 48, 75, 83, 84, 86, 88, 90, 90:1, 91, 93, 93:1, 99, 100, 103, 104, 108, 109, 110, 119, 123, 147, 213, 269;

C.I. Basic Blue 7, 81, 83, 88, 89;

C.I. Basic Violet 2, C.I. Direct Blue 1, 3, 28, 29, 41, 42, 47, 52, 55;

C.I. Food Violet 3; and

C.I. Mordant Violet 1, 1:1, 3, 6, 8, 10, 11, 15, 16, 17, 18, 19, 21, 23, 27, 28, 33, 36, 39, 49; It may be one or more, but is not limited thereto.

The tetraazaporphyrin-based dye may refer to a dye including a compound having a tetraazaporphyrin skeleton in a molecule, and the type thereof is not particularly limited in the present invention.

The anthraquinone-based dye may refer to a dye including a compound having an anthraquinone skeleton in a molecule, for example,

C.I. solvent violet 11, 13, 14, 26, 31, 36, 37, 38, 45, 47, 48, 51, 59, 60;

C.I. Solvent Blue 14, 18, 35, 36, 45, 58, 59, 59:1, 63, 68, 69, 78, 79, 83, 94, 97, 98, 100, 101, 102, 104, 105, 111, 112, 122, 128, 132, 136, 139;

C.I. Acid Violet 34;

C.I. acid blue 25, 27, 40, 45, 78, 80, 112;

C.I. Disperse Violet 26, 27;

C.I. Disperse Blue 1, 14, 56, 60;

C.I. Direct Blue 40; and

C.I. It may be one or more selected from the group consisting of; Mordine Blue 8, but is not limited thereto.

In addition to the above-described dye, the blue dye may include, but is not limited to, a methine-based dye, an azo-based dye, and a phthalocyanine-based dye.

The content of the dye can be adjusted according to the needs of the user and may be used without any particular limitation within the range that does not impair the effects of the present invention. For example, 3 to 10 parts by weight based on 100 parts by weight of the starch. , Preferably it may be included in 4 to 7 parts by weight.

additive

The surface sizing composition according to an embodiment of the present invention may further include an additive. The type of the additive is not particularly limited in the present invention, and may be selected and used according to the needs of those skilled in the art within a range that does not impair the effects of the present invention. The additive may include, for example, a filler, a fixing agent, a retention agent, and the like.

The filler is a kind of functional additive used to change the quality characteristics of the cast coated paper, for example, talc, calcium carbonate (CaCO ₃ ), titanium dioxide (TiO ₂ ), or clay. may be mentioned, but is not limited thereto. When the filler is further included as an additive, the internal structure of the finally manufactured paper can be dense, and printability such as opacity and smoothness or gloss can be improved, and whiteness can be further improved.

When the fixing agent is further included, coloring of the dyes that may be included together may be easier. The type of the fixing agent is not particularly limited as long as it is a fixing agent generally used in the art, but a fixing agent having a high charge density and a low molecular weight so that residual dye particles can be fixed may be used.

The retention agent is a component that can be added for the purpose of agglomeration and retention of the materials constituting the cast coated paper, for example, in the form of cationic polyacrylamide (PAM), bentonite or silica combined microparticles. may be included, but is not limited thereto.

The content of the additive can be adjusted according to the needs of the user, and can be used without any particular limitation within the range that does not reduce the effect of the present invention.

<surface sizing Preparation method of composition>

Another aspect of the present invention relates to a method for preparing the aforementioned surface sizing composition. The above-mentioned bar may be applied in the same manner as for the specific content of each constituent material of the present manufacturing method.

A method for preparing a surface sizing composition according to another aspect of the present invention includes a first step of gelatinizing starch to a concentration of 15 to 35%; a second step of diluting the gelatinized starch to a concentration of 10 to 15%, adding a surface sizing agent to the diluted starch, and adding one or more from the group consisting of a starch curing agent, a dye, and an additive; and finally a third step of further adding copper powder, whereby the antibacterial activity is improved through the copper powder, and the optical quality is improved without discoloration of the copper powder despite the inclusion of the copper powder and the surface sizing agent together There is an effect capable of producing a surface sizing composition capable of producing an excellent cast coated paper.

When describing the manufacturing method in detail, the first step is a step of gelatinizing the starch to a concentration of 15 to 35%, preferably 20 to 30%, and is performed in a gelatinization tank. Specifically, the starch of the solid content is added to fresh water or process water at a temperature of 60 to 100° C., preferably 80 to 100° C., and more preferably 90 to 100° C., and mixed. When gelatinization is made within the above temperature range, there is an advantage that the dispersion of the starch is easy, so that the preparation of the surface sizing composition can be facilitated. In this case, the same applies to the specific contents of the starch as described above.

In the second step, the starch gelatinized in the first step is diluted to a concentration of 5 to 20%, preferably 10 to 15% under a temperature condition of 60 to 80° C., and a surface sizing agent is added to the diluted starch. After that, it is a step of further adding and mixing at least one selected from the group consisting of a starch curing agent, dyes and additives. In this case, the same kind of fresh water or process water used in the first step may be used for dilution of the starch, and according to an embodiment of the present invention, the surface sizing agent may be an alkenyl ketone dimer. Specific details of the surface sizing agent, the starch curing agent, the dye and the additive are the same as described above. The second step is performed under a temperature condition of 60 to 80° C., and when the temperature condition is out of the above temperature condition, there is a problem in that the subsequent application amount may be changed according to the increase in the viscosity of the mixture, particularly when the temperature condition is less.

The third step is a step of preparing a surface sizing composition by finally adding and mixing copper powder to the mixture prepared in the second step. The copper powder is preferably added last in the manufacturing process of the surface sizing composition, and when the copper powder is added at the same time as the other components, the other components that exhibit their respective performance by interaction with starch It may inhibit the components from binding to and interacting with the starch particles.

According to an embodiment of the present invention, the method may further include stirring the copper powder at 400 to 600 RPM for 1 minute to 30 minutes after adding the copper powder. In this case, since the copper powder in the surface sizing composition is uniformly distributed, it is possible to evenly distribute the copper powder on the surface of the cast coated paper, and through this, there is an advantage that a uniform antibacterial power can be introduced throughout the cast coated paper. If the above conditions are not satisfied, there is a risk of copper powder agglomeration, and in this case, even if the surface sizing composition is applied to the cast coated paper, the copper powder is applied unevenly, thereby causing a local difference in antimicrobial activity.

<cast porcelain Manufacturing method>

Another aspect of the present invention is a size press step of applying the above-described surface sizing composition to one side or both sides of the base paper; and a cast coating step of performing a cast coating on one surface of the size-pressed base paper.

According to an embodiment of the present invention, the size pressing step may be to apply the surface sizing composition at an application amount of 2 to 15 g/m ² , preferably 3 to 9 g/m ² per one side of the base paper. The application amount can be freely adjusted within the above range according to the equipment process of the conventional base paper, for example, in the case of a Pond Size Press, the application amount may be 8 to 9 g/cm ² per side, and the metering size In the case of a press (Metering Size Press), the application amount per side may be 3 to 4 g/cm ² . When the amount of application of the surface sizing composition is adjusted as described above, there is an advantage that antibacterial activity can be uniformly introduced to the entire surface of the base paper. may deteriorate the optical quality, and the manufacturing cost of the base paper and the cast coated paper may increase due to the high cost of copper powder. If it is less than the above range, as a result, there is a fear that the antibacterial power imparted to the cast coated paper may be lowered.

In the present invention, which is a specific method for the cast coating in the cast coating step, it is not particularly limited, and it can be prepared by a conventional method known in the art, and as an example, manufactured by the method disclosed in Korean Patent Registration No. 10-1073946 it may have been

Hereinafter, preferred examples are presented to help the understanding of the present invention, but the following examples are merely illustrative of the present invention, and it will be apparent to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention. , it is natural that such variations and modifications fall within the scope of the appended claims. In the following Examples and Comparative Examples, "%" and "part" indicating the content are by weight unless otherwise specified.

Example : sizing Preparation of the composition

500 kg of oxidized starch (Histar CA, Ingredion) was put into the gelatinization tank, water was added to the gelatinization tank, and the oxidized starch was gelatinized at 95° C. until the concentration of 22%, and then the gelatinized oxidized starch was prepared as a stock solution. It was moved and stored. After moving the oxidized starch in the undiluted solution tank to the dilution tank, until the oxidized starch reaches a concentration of 13% Diluted at 60°C and maintained at 60°C or higher, based on 100 parts by weight of the oxidized starch, 3.6 parts by weight of an alkenyl ketene dimer (IMPRESS ST-145, Solenis), 0.5 parts by weight of a starch hardener (STREN-DF, Sehan Industries) Part, 5.8 parts by weight of a fluorescent dye (SINARWHITE C, Sungchang), 0.013 parts by weight of a purple dye (CARTASOL VIOLET 3B, ARCHROMA), and 0.08 parts by weight of a blue dye (CARTASOL TURQUOISE KRL, ARCHROMA) were added and mixed. After confirming that the above materials are well mixed, finally, 3 parts by weight of spherical copper powder (HACU-025, Changseong) having a particle diameter of 2.5 μm (based on laser diffraction particle size analysis) is added based on 100 parts by weight of the oxidized starch to 500 The surface sizing composition was prepared by sufficiently stirring at RPM for 15 minutes.

comparative example One

Except for using a styrene/acrylic acid copolymer (REPELON-NS, Sehan Industrial Co., Ltd.) as a surface sizing agent in the above example, all configurations and methods were the same to prepare a surface sizing composition.

production example 1: Manufacture of base paper (size press process)

production example 1-1

The size press process was performed by applying the surface sizing composition prepared in the above example to both sides of white paper at an application amount of 8 g/m ² using a Pond Size Press method.

production example 1-2

The surface sizing composition prepared in Comparative Example was subjected to a size press process in the same configuration and method as in Preparation Example 1.

production example 2: Cast porcelain Produce

Cast coated paper was prepared in the following manner using each of the base papers prepared in step 1 in the above preparation.

As the coating solution for the cast coating, the cast coating solution produced by the company (Moorim SP Co., Ltd.) was used, and the cast coating solution was applied to one side of each base paper prepared in Preparation Example 1 using an air knife coater at 25 g/m2. Then, the wet coated surface is re-wetted using an aqueous formic acid solution (solid content concentration of 3%), and the coated surface, which has been completed until re-wetting, is pressed and dried on a cast (mirror surface) drum at 95 ° C. was prepared.

In the case of the cast coated paper (see FIGS. 1 (b-1) and 2 (b-2)) using the base paper of Preparation Example 1-2 (using the composition of Comparative Example), the base paper of Preparation Example 1-1 (in Example composition) using the cast coated paper (see FIGS. 1 (a-1) and 2 (a-2)) to the extent that both sides (cast coated side and back) of the cast coated paper can be visually confirmed than the color change (gray series) was found to have occurred.

Experimental example : Antibacterial activity test

An antibacterial activity test was requested for the cast coated paper prepared in Preparation Example 2 above. The antibacterial activity test was carried out by requesting the FITI testing institute, and the test was carried out according to the JIS Z 2801 (2010, film adhesion method) method. At this time, the experimental conditions are as follows, and the experimental results are shown in Table 1 below.

<Experimental conditions>

Standard film: STOMACHER® 400 POLY-BAG

Test bacteria: (35±1) ℃, measure the number of bacteria after 24 hours of stationary culture at 90% R.H.

Strain: Staphylococcus aureus ATCC 6538P, Klebsiella pneumoniae ATCC 4352, Escherichia coli ATCC 8739

division cast coated side ^{One )} back ^{2 )} after 24 hours
number of bacteria Antibacterial activity ^{3 )} after 24 hours
number of bacteria antibacterial activity unit Number of bacteria/cm ² log value Number of bacteria/cm ² log value yellow
Staphylococcus aureus control ^{4 )} 2.5×10 ⁴ - 2.5×10 ⁴ - Example < 0.63 4.5 < 0.63 4.5 pneumococci control 4.9×10 ⁵ - 4.5×10 ⁵ - Example < 0.63 5.8 < 0.63 5.8 coli control 1.1×10 ⁶ - 9.2×10 ⁵ - Example 7.9×10 ² 3.1 <0.63 6.1 1) Coated side: One side portion on which the cast coating was made during the manufacturing process of the cast coated paper of Preparation Example 2
2) Back side: the opposite side of the coated side, one side without cast coating
3) Antibacterial activity value: If it is 2.0 or higher, it is evaluated as having an antibacterial effect.
4) Control: Inoculation and culture of strains without restraint

As can be seen from Table 1, in the case of the base paper coated with the surface sizing agent composition of the present invention, it was confirmed that both the cast-coated surface and the back surface had excellent antibacterial activity.

Claims (13)

including starch, copper powder and a surface sizing agent,
The surface sizing agent is an alkenyl ketone dimer,
The surface sizing agent is included in an amount of 1 to 10 parts by weight based on 100 parts by weight of starch,
The copper powder is included in an amount of 1 to 10 parts by weight based on 100 parts by weight of starch,
The copper powder has a particle diameter of 1㎛ to 6㎛, the surface sizing composition, characterized in that the shape is spherical. According to claim 1,
The sizing composition is a surface sizing composition, characterized in that it further comprises at least one selected from the group consisting of a starch curing agent, dyes and additives. delete delete delete A first step of gelatinizing the starch to a concentration of 15 to 35%;
a second step of diluting the gelatinized starch to a concentration of 5 to 20%, adding a surface sizing agent to the diluted starch, and adding one or more from the group consisting of a starch curing agent, a dye, and an additive; and
Finally, a third step of further inputting copper powder includes;
The surface sizing agent is an alkenyl ketone dimer,
The surface sizing agent is included in an amount of 1 to 10 parts by weight based on 100 parts by weight of starch,
The copper powder is included in an amount of 1 to 10 parts by weight based on 100 parts by weight of starch,
The copper powder has a particle diameter of 1 μm to 6 μm, and the method for producing the surface sizing composition of any one of claims 1 and 2, characterized in that the shape is spherical. 7. The method of claim 6,
Method for producing a surface sizing composition, characterized in that it further comprises the step of stirring for 10 minutes to 30 minutes at 400 to 600 RPM after adding the copper powder. delete delete delete delete A size press step of applying the surface sizing composition of any one of claims 1 and 2 to one side or both sides of a base paper; and a cast coating step of performing a cast coating on one surface of the size-pressed base paper. 13. The method of claim 12,
The method for producing a cast coated paper, characterized in that the application amount of the surface sizing composition is 2 to 15 g/m ² per one side of the base paper.

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