JP6427569B2 - Antifungal paper and antifungal gypsum panel, antibacterial paper coating method and related method - Google Patents

Description

Cross-Reference to Related Applications This patent application is filed on Dec. 3, 2013, U.S. Patent Application No. 14 / 095,499 and U.S. Provisional Patent Application No. 61 / 858,698, filed on Jul. 26, 2013. Claim priority based on. These applications are incorporated herein by reference in their entirety.

  The present invention relates to paper resistant to microbial growth. An antimicrobial coating composition is also provided. The invention also relates to a method of making a mold-proof paper and a mold-proof gypsum panel.

  Gypsum panels, also known as gypsum panels, drywalls and wallboards, are popular as construction materials and have desirable properties for indoor applications. The production of gypsum board involves forming a gypsum core from a slurry of calcium sulfate hemihydrate, water and additives. The slurry is deposited continuously on a conveyor and sandwiched between two sheets of cover paperboard. One board is called the cover and the other is called the backing. The two sheets of paperboard each have two sides or surfaces. One side is the back or adhesive side in contact with the gypsum slurry and is known as the "bottom or back side of the paper". The other side of each board is not in contact with the gypsum slurry and is known as the "top side". The resulting assembly is formed into a panel shape. Calcium sulfate hemihydrate is reacted with water, the hemihydrate is converted to a matrix of coupled calcium sulfate dihydrate crystals, and the slurry solidifies and becomes firm. This forms a continuous band of hardened material. The strip continuous plate moves on the conveyor, and eventually the calcined gypsum fully solidifies and can withstand transport and movement from the conveyor. Next, the continuous strip of gypsum is cut to an appropriate length, and then the gypsum panel is heated to a high temperature in a calciner to evaporate excess water not necessary for hydration of calcined gypsum from the gypsum panel.

  When microorganisms grow, they prefer an environment in which the spores have water and nutrients for metabolism. Water vapor and spores can not be avoided in environments where gypsum panels are used. In addition to the water vapor present in the environment, the products used in interior construction may be exposed to water due to seepage, roof and pipe leaks, runoff and condensation. These exposures occur without any defects in the production or use of gypsum board.

  Coverboards for gypsum panels, also known as facers, facings, paper facers, etc., are made by a papermaking process beginning with preparing diluted pulp of fibers from waste paper, chemical additives and water. Waste paper is separated from contaminants, concentrated into pulp, concentrated and purified, and then passed through a screen to form a mat of randomly intertwined fibers. Excess water is removed by pressurizing or suctioning the mat. Informally, "wet end" refers to the papermaking process prior to removing water from the thin stock, which forms and pressurizes the paper. The process of the process from pressurization to the hope reel is called "dry end". Once flushed and pressurized, the mat is then moved through the dryer area where the remaining water is evaporated. The paperboard is then processed by a calender stack to increase the water vapor content (4-9%) and the surface of the fibrous paperboard is polished.

  Attempts have been made to make gypsum boards resistant to microbial growth by incorporating biocides such as pyrithione salts into gypsum cores, facers or both. This is disclosed in U.S. Patent No. 6,893,752 entitled "Antifungal Gypsum Panels and Methods of Making the Same" which is incorporated herein by reference. However, it has been found that obtaining mold-proof papers suitable for gypsum panels is difficult and expensive. Methods previously known in the art add a water soluble or dispersible biocide in the wet end of the papermaking process. Then, when the water is drained and the water is squeezed out of the paper mat, most of the biocide is lost during the forming process. The remaining biocides are further degraded during the drying process in paper mill and board furnaces. Thus, there is still a continuing need to obtain paper carrying a sufficient amount of bactericide to inhibit microbial growth.

  For example, an antifungal paper is provided which retains an amount of the active bactericide sufficient to inhibit the growth of microorganisms such as mold and mildew. A method of making a mold resistant paper having an antimicrobial coating, and a method of applying the antimicrobial coating to a paperboard is provided. Also provided are gypsum panels having improved antimicrobial properties, and methods of making the panels.

In one embodiment, an antifungal paper coated with one or more surfaces using an antimicrobial coating comprising a polymerized siloxane and a germicide is provided. In some embodiments, the microbicide may comprise one or more of the following: Butylcarbamate 3-iodo-2-Puropini Le, zinc pyrithione, zinc oxide, azoxystrobin, thiabendazole, octyl isothiazolin, dichloro - octyl isothiazolin, zinc dimethyldithiocarbamate, benzimidazole, 3- (3,4-dichlorophenyl) -1,1-Dimethylurea.

Various grades of paper, including Manila and Newslined, can be formulated to be mildew resistant by calendering with an antimicrobial composition comprising a polymerized siloxane and one or more of the following germicides. Fungicides, for example, butyl carbamic acid 3-iodo-2-Puropini Le, zinc pyrithione, zinc oxide, azoxystrobin, thiabendazole, octyl isothiazolin, dichloro - octyl isothiazolin, zinc dimethyldithiocarbamate, benzimidazole, 3- (3 And 4-dichlorophenyl) -1,1-dimethylurea and the like. Suitable antimicrobial compositions include those in which the germicide particles are greater than 1 micron and less than 30 microns. In at least some embodiments, the antimicrobial coating composition further comprises a binder, which includes binders such as carboxymethylcellulose, polyvinyl alcohol, styrene acrylic latex, styrene butadiene, casein and starch.

  In further embodiments, gypsum panels resistant to mold and mildew are also provided. This panel is made by sandwiching a gypsum core between two mildew resistant paperboards obtained by coating at least one side of the paperboard with an antimicrobial coating composition having a polymeric siloxane and a germicide.

FIG. 1 shows that the resistance of the gypsum panel to mold is improved by the non-water soluble germicide. FIG. 2 shows that the resistance of the gypsum panel to mold is improved by the change in size of the water-insoluble germicidal particles.

  Various grades of paper can be used in the antifungal gypsum panel, including those disclosed in U.S. Patent Publication No. 2012/0088114, "Antifungal gypsum panel". The teachings of this patent publication are incorporated herein by reference.

  Suitable papers further include Manila or smooth calendared covers, and Newslined or roughened backing papers. Both grades of paper are multi-layered with one or more liner layers and several filler layers. The Manila liner layer typically uses recycled paper from hardwood pulp having short fibers as compared to the filler layer in which the long fibers are used. The short fibers from hardwood pulp provide a smoother surface suitable for painting and interiors. Newslined paper usually has the same type of fibers in the liner layer as the fibers used in the filler layer.

  It has been unexpectedly ascertained that various papers can be formulated to be mildew resistant. Such papers include, but are not limited to, multilayer papers comprising one or more liner layers and one or more filler layers. Such papers also include, but are not limited to, Manila and Newslined papers.

  As used herein, the term "anti-mycotic" paper is used broadly and includes any paper that retains a sufficient amount of a bactericide sufficient to inhibit, retard or prevent microbial growth completely or partially. Be The term "microbial growth" is also used broadly and includes the growth of bacteria, fungi, yeasts, molds, mildew and algae. The term "antibacterial" is used broadly and means antibacterial, antifungal and anti-yeast. Additionally, all percentages disclosed herein are calculated by weight. The resistance of the paper to mold can be determined by a standard test for resistance to mold growth on the interior coating surface, which is carried out in an environmental chamber, which is known as the standard mildew test ASTM D3273-12. . Based on this standard, in the ASTM D3273-12 test which is performed while exposing the paper to the soil sowed with mold, a score of 8 (11 to 20% of the surface is polluted and covered with the mold The paper is classified as mildew resistant if a score of 9 (1 to 10% stain) or a score of 10 (0% stain) is obtained. The same standard test ASTM D3273-12 can be used to measure the mold resistance of gypsum panels. Based on this standard, the gypsum panel is mold resistant if a score of 8 (11-20% stain), a score of 9 (1-10% stain), or a score of 10 (0% stain) is obtained It is classified as

  In at least some embodiments, mildew resistant papers are made using recycled materials, including old newsprint. Hereinafter, this recycled material is called News. Paper may contain 100% or less of News. In at least some embodiments, the paper is made of 70% News and 30% Fly Leaf fibers, the Fly Leaf fibers being 0.8 to 1.5 mm in length, usually 20 to 25 It is a staple fiber having a percentage of ash. In at least some embodiments, the mildew resistant paper may comprise 80% or less of News and 20% Fly Leaf fibers. In some other embodiments, the mildew resistant paper may comprise 90% or less of News and 10% Fly Leaf fibers. The liner of the backing may be corrugated cardboard (OCC) or double lined Kraft (DLK) recycled paper. These waste paper fibers usually have two-thirds of a softwood kraft liner fiber having a length of 2.5 to 3.6 mm and one-third of an inter-liner hard core fiber of 0.8 to 1.5 mm.

  The mold resistant paper is prepared by applying an antimicrobial coating on at least one or both sides (front and bottom) of the two sides of the paper during the calendering process. In some embodiments, the mold resistant paper is made to be coated on both sides with a coating. In another embodiment, the coating is applied to only one side. In a further embodiment, only the front side of the paper is coated. In a further embodiment, only the bottom side of the paper is coated. In yet another embodiment, an antimicrobial coating is applied to both sides of the paper, ie, the front and bottom sides.

  In at least some embodiments, the antimicrobial composition comprises a polymerized siloxane and a biocide. Various antimicrobial agents can be used in the antimicrobial coating formulation. Water insoluble or poorly water soluble germicides are particularly preferred. As used herein, the term "insoluble germicide" is used broadly and includes germicides that are hydrophobic and poorly soluble in water. In some embodiments, the insoluble biocide has a water solubility of 35 parts per million (ppm) or less. Water soluble germicides are not preferred.

  Figure 1 reports the surprising result that the antifungal properties of gypsum panels depend on whether the germicide used in the paper coating composition is water insoluble or water soluble. As described herein, mold resistant papers were prepared with various coating compositions using water insoluble biocides and siloxanes. A gypsum panel was then prepared using this coated or uncoated control paper, or a paper coated with a combination of siloxane and a water soluble biocide. Thereafter, all gypsum panels were tested in the Mildew Standard Test D3273-12. As shown in FIG. 1, the control gypsum panel made using paper without germicide was not mold resistant and had a score of 0 (91 to 100% stain) in the mold resistance test. See control in FIG. Plaster panels made of paper coated with a combination of siloxane and a water-soluble bactericidal agent have only a slight improvement in mold resistance, and score 2 (71 to 80% fouling) to score 6 (31 to 31). The majority of samples were 40% fouling). See the solubles in FIG.

  Gypsum panels made using paper coated with a combination of siloxane and a water-insoluble bactericide as described herein were also tested. See the insolubles in FIG. It was unexpectedly found that these gypsum panels have significantly improved antifungal properties and many samples have a score of 8 (11-20% fouling) or higher. Some samples with non-water soluble bactericide showed no fouling at all, with a score of 10. See the insolubles in FIG.

  It has also been unexpectedly ascertained that the bactericide particle size in the antimicrobial coating of the antifungal paper affects the ability of the antifungal paper to inhibit, retard or prevent the growth of microorganisms completely or partially. Suitable antimicrobial coating formulations include those having a microbicide having a particle size of about 1 micron to about 30 microns. In some embodiments, the coating formulation is made with a germicide wherein the germicidal particles are greater than 1 micron and less than 15 microns. In a further embodiment, the antimicrobial coating is formulated with germicidal particles such that 90% or more of the particles are greater than 1 micron and less than 15 microns. In another embodiment, the antimicrobial coating is formulated with germicidal particles such that 90% or more of the particles are 8 to 15 microns. In at least some embodiments, the antimicrobial coating is formulated with germicidal particles such that 90% or more of the particles are 10 to 26 microns. Disinfectants with most particles less than 1 micron or greater than 30 microns are not preferred.

  FIG. 2 reports surprising results showing that the antifungal properties of gypsum panels are dependent on the particle size of the non-water soluble bactericide used in the paper coating composition. As described herein, mold resistant papers were prepared with various coating compositions using water insoluble biocides and siloxanes. A gypsum panel was then prepared using this coated or uncoated control paper, or a paper coated with a combination of siloxane and a water soluble biocide. Thereafter, all gypsum panels were tested in the Mildew Standard Test D3273-12.

  In FIG. 2, the same non-water soluble germicide with two different particle sizes was tested. In the first formulation, 95% of the biocide particles were less than 1 micron, and in the second formulation, 95% of the biocide particles were greater than 1 micron and less than 5 microns. The second formulation showed better mold resistance, as shown by the comparison of D (95% <5 um) and D (95% <1 um) in FIG. In addition, the formulation with another water-insoluble bactericide with 95% of the particles being about 13 microns certainly showed excellent antifungal properties, with an antifungal rating of 10 (0% fouling) . See D in FIG. 2 (95% <13 um). This result was a significant improvement over gypsum panels made with paper without the mildew coating and paper with a mildew coating using a water soluble germicide.

It is suitable for a variety of fungicides antimicrobial coating formulation, butyl carbamic acid 3-iodo-2-Puropini Le This fungicide, zinc pyrithione, zinc oxide, azoxystrobin, thiabendazole, octyl isothiazolin, dichloro - octyl Non-limiting examples include isothiazoline, zinc dimethyldithiocarbamate, benzimidazole and 3- (3,4-dichlorophenyl) -1,1-dimethylurea. These germicides can be used individually or in combination with one another. In at least some embodiments, zinc pyrithione can be used in combination with zinc oxide. In other embodiments, azoxystrobin can be used in combination with thiabendazole. One particularly preferred antimicrobial coating formulation comprises a microbicide mixed with 15-25% thiabendazole and 10-20% azoxystrobin. In at least some embodiments, a preferred bactericidal agent is a dispersion of about 19.5% thiabendazole and about 15% azoxystrobin. In another embodiment, a combination of azoxystrobin and thiabendazole is used as a first germicide and one or more other compounds are used as a second germicide. In some embodiments, the second biocidal agent may be zinc pyrithione, zinc oxide, or a combination of the two compounds.

  In some embodiments, the antimicrobial coating comprises 1.0 to 10% by weight of a biocide. In another embodiment, the antimicrobial coating comprises 1 to 6% by weight of a bactericide. In another embodiment, the antimicrobial coating comprises 1 to 4% by weight of a bactericide.

Various polymeric siloxanes can be used in the antimicrobial coating formulation. The term "polymerization siloxane" are used in a broad sense, it includes compounds having the formula [R 2 _{SiO] n.} "N" in the formula represents the number of repetitions of R ₂ SiO units in the polymer. The two R groups can each be different or the same. The two R groups are each selected from the group consisting of hydrogen, halogen and organic groups. Suitable organic groups include, but are not limited to methyl, ethyl and phenyl. In some embodiments, non-ionic polymeric siloxanes are preferred. In at least some embodiments, the polymerized siloxane is polydimethylsiloxane.

  In some embodiments, the antimicrobial coating comprises 1-10 wt% polymerized siloxane. In other embodiments, 1 to 6% by weight of polymerized siloxane is used. In a further embodiment, 1 to 4% by weight of polymerized siloxane is used.

  In at least some embodiments, the antimicrobial coating composition is made by mixing 1-10 parts of one or more bactericidal agents with 1-10 parts of the polymerized siloxane and 98-80 parts of water. In a further embodiment, about 10 parts of one or more germicidal agents are mixed with about 4 parts of the polymerized siloxane and about 86 parts of water. In a further embodiment, about 3 parts of one or more germicides are mixed with about 4 parts of the polymerized siloxane and about 97 parts of water.

  In some embodiments, the antimicrobial coating composition further comprises a binder. It has unexpectedly been found that binders improve the adhesion of the germicidal particles to the paperboard. It has further unexpectedly been found that binders are particularly preferred in formulations having larger germicidal particles. In some embodiments, when formulated with germicidal particles larger than 5 microns, it is preferred that the antimicrobial coating composition comprises a binder.

  Various binders are suitable for the antimicrobial coating composition. These binders include, but are not limited to, carboxymethylcellulose (CMC), polyvinyl alcohol (PVOH), styrene acrylic latex, styrene butadiene, casein, starch and the like. In at least some embodiments, the antimicrobial coating composition comprises about 0.01% to about 0.05% of a binder. In some other embodiments, about 0.03% binder is used.

  In at least some embodiments, suitable carboxymethylcelluloses are low molecular weight polymers. A preferred carboxymethylcellulose binder is Ashland Hercules, Inc. under the name AQUALONTM CMC-7LT. It is more available and has a degree of substitution of about 0.7 and a low viscosity. In some embodiments, carboxymethyl cellulose in an amount of about 2 to about 10 lb / ton can be used in the antimicrobial coating formulation. In at least some preferred embodiments, carboxymethylcellulose is used at about 6 lb / ton.

  Other suitable binders include partially hydrolyzed PVOH products having low to moderate viscosity. Such binding agents are available from DuPont under the names ELVANOLTM 51-05, 52-22 and 50-42. These binders can be used in amounts of about 2 to about 10 lbs / ton, preferably about 6 lbs / ton.

  A further embodiment of the antimicrobial coating comprises a colorant. Suitable colorants include Chromatech, Inc. Phthalocyanine green, Michelman, Inc. USGRN pigments, and BASF, Inc. Non-limiting examples include Solar P Blue 42L, manufactured by Colorants can be used in amounts of about 0.01% to about 2% in the resulting antimicrobial composition.

  Anti-mold paper is prepared during the calendering process by coating the paper with an antimicrobial composition. This antimicrobial composition can be supplied from the working tank to the calendar stack using a pump after being prepared in advance in the mixing tank. In some embodiments, the coating is applied in an amount of about 0.10 lbs / MSF to about 2.50 lbs / MSF. In at least some embodiments, the coating composition can be applied to only one side of the paper. In a further embodiment, the coating composition is applied on both sides. In at least some embodiments, the coating composition is applied only to the front side of the paper. In another embodiment, the coating composition is applied only to the bottom side of the paper.

  The coating application rate or coating pick-up rate in the calender stack is: fiber type, waste paper used to form the liner single layer or liner multilayer, paperboard porosity, paperboard moisture entering the calender stack, paperboard water resistance, paperboard density It is governed by the coating solids, the coating foam, the coating temperature, the paper machine speed, and the design or mechanism of the calender stack. The coating pick-up speed in a calender stack is determined by some of the above factors and is comparable for a particular grade of paper on a particular paper machine. In a further embodiment, the coating formulation is adjusted to apply the germicide at 300 ppm to about 4500 ppm.

In at least some embodiments, prior to coating, in advance heated antimicrobial coating composition to about ¹¹⁰ o F. to about 160 ^o F. In a further embodiment, it is preferable to pre-heat the coating composition to about ¹²⁰ o F. to about 140 ^o F.

  Various tests can be performed to determine the amount of active germicide retained on paper. These methods include, but are not limited to, UV spectrophotometry, analytical high pressure liquid chromatography (HPLC) and x-ray fluorescence studies.

Further tests include water resistance tests, which measure the amount of water absorbed by the paper during a specific time. The results of this test are recorded as the Cobb reference value in grams of water absorbed by 100 cm ² of paper. It has unexpectedly been ascertained that suitable mold resistant papers include those with Cobb reference values of 0.4 g to 1.6 g per 100 cm ² of paper.

  Various grades of paper can be formulated to be mildew resistant, including Manila and Newslined grades. Manila is a hard sized paperboard. Typically, 8 to 10 lb / ton alkenyl succinic anhydride (ASA) size is applied to the top two layers of the liner layer, although the ASA size supply may be 4-5 lb / ton. The filler layer contains 3 to 7 lb / ton ASA size. Alum is supplied to the liner layer and the filler layer at 3 to 7 lb / ton, but usually at 5 lb / ton. The liner furnish is a "new portion", high yield furnish but low ash TMP or groundwood pulp. The paperboard needs to be properly dried so that the ASA size forms a covalent bond with the cellulose. Thereafter, standard papermaking chemicals (yield enhancers, flocculants) are added and standard papermaking procedures are followed to obtain properly formed paperboard. The average Manila basis weight is 44 lbs / MSF, winding is typically 5530 lbs, and includes 125 MSFs / roll.

  In some embodiments, coating paper with an antimicrobial coating composition comprising about 1.5% to about 7% of a polymerized siloxane and about 1% to about 7% of one or more bactericidal agents. Can be formulated to be mildew resistant by Manila grade paper. The wet calender stack applies the coating at about 300 ppm to about 4500 ppm active germicide. In some embodiments, the coating is applied with a wet calender stack at about 300 ppm to about 1500 ppm of the active germicide. In yet another embodiment, the coating is applied at about 300 ppm to about 1500 ppm of active polymeric siloxane by a wet calendar stack.

  Newslined is a hard sized paperboard. Typically, 8-10 lb / ton ASA size is applied to the top two layers of the liner layer, although the ASA size supply may be 4-5 lb / ton. The filler layer contains 3 to 7 lb / ton ASA size. Alum is supplied to the liner layer and the filler layer at 3 to 7 lb / ton, but usually at 5 lb / ton. The furnish is “cardboard waste paper” or “double lined craft” waste paper. Use waste paper of the same grade as the Manila grade filler layer. The size concentration may be reduced to obtain the bound Cobb reference value. The paperboard needs to be properly dried so that the ASA size forms a covalent bond with the cellulose. Thereafter, standard papermaking chemicals (yield enhancers, flocculants) are added and standard papermaking procedures are followed to obtain properly formed paperboard. The average basis weight is 42 b / MSF, the take up is usually 5585 lbs, including 133.5 MSF / roll.

  Coating Newsline grade paper with a paper coated with an antimicrobial coating composition comprising about 1.5% to about 7% of polymerized siloxane and about 1% to about 7% of one or more bactericidal agents It can be formulated to be moldy. The coating is applied by wet calendering stack to an active germicide concentration of about 300 ppm to about 4500 ppm.

  By using a mold-proof paper as a facer, a gypsum panel with improved mold resistance can be prepared. In some embodiments, as described above, mildewproof boards of Manila and Newslined grades are obtained. Next, a gypsum slurry is prepared, and one side is sandwiched with mildew-proof Manila paper, and the other side is pinched with mildew-proof Newslined paper.

Example 1 Antimicrobial Coating Composition A coating was prepared according to the formulation in Table 1. In the table, all parts were calculated by weight.

Example 2 Antifungal Manila Paper Paper according to Manila grade was prepared according to the grade standard. An antimicrobial coating composition was prepared as described in Table 1. The antimicrobial coating composition was then fed to a water flow box and applied to paper by wet calendering stack with about 500 ppm zinc pyrithione, 950 ppm thiabendazole and 750 ppm azoxystrobin.

Example 3 Antifungal Newslined Paper Newslined paper was prepared using a liner mixed with 30% Fly Leaf and 70% News. 6.5% polymerized dimethylsiloxane aqueous solution was prepared, to prepare the antimicrobial coating by it get mixed to 2% IPBC solution with butyl carbamate 3-iodo-2-Puropini Le (IPBC). The antimicrobial coating composition was then fed to a water box and applied to Newslined paper by wet calendering stack with about 500 ppm of active germicide. Acrylic latex was applied to improve water resistance and the germicide was bound to the paperboard.

While specific embodiments have been shown and described, changes and modifications may be made to the specific embodiments described above without departing from the invention in its broadest aspects and the invention as set forth in the claims below. It will be apparent to those skilled in the art that it is good.
[Supplementary Note 1]
An antifungal paper coated on at least one surface with an antimicrobial coating comprising 1% to 10% of a polymerized siloxane and 1% to 10% of a water insoluble bactericide, said water insoluble bactericide being butyl Carbamate 3-iodo-2-propynyl, zinc pyrithione, zinc oxide, azoxystrobin, thiabendazole, octylisothiazoline, dichloro-octylisothiazoline, zinc dimethyldithiocarbamate, benzimidazole, 3- (3,4-dichlorophenyl) -1 Antifungal paper selected from the group consisting of, 1-dimethylurea and combinations thereof.
[Supplementary Note 2]
The antifungal paper according to appendix 1, wherein said polymeric siloxane is a compound having the chemical formula [R ₂ SiO] _n , wherein "n" in said chemical formula represents the number of repetitions of said R ₂ SiO unit in the polymer Two said R groups can each be the same or different, said R groups being each selected from the group consisting of hydrogen, halogen, methyl, ethyl and phenyl.
[Supplementary Note 3]
The antifungal paper of appendix 1, wherein the paper is a multilayer paper having one or more liner layers and one or more filler layers, wherein the liner layers are 100% New and 70% News and The mold resistant paper of Additional Note 1 selected from the group consisting of a combination of 30% Fly Leaf.
[Supplementary Note 4]
The antifungal paper according to attachment 1, wherein the germicide comprises particles, wherein 90% or more of the particles are greater than 1 micron and less than 15 microns.
[Supplementary Note 5]
The anti-mold paper of additional note 1 further comprising a binder selected from the group consisting of carboxymethylcellulose, polyvinyl alcohol, styrene acrylic latex, styrene butadiene, casein and starch.
[Supplementary Note 6]
A method of making a mold resistant multilayer paper, said method comprising
Feeding the paper into a calendar stack;
Providing an antimicrobial coating composition comprising 1% to 10% non-ionic polymerized siloxane and 1% to 10% non-water soluble bactericide to the calendar stack, wherein the non-water soluble bactericide is butyl carbamine Acids 3-iodo-2-propynyl, zinc pyrithione, zinc oxide, azoxystrobin, thiabendazole, octylisothiazoline, dichloro-octylisothiazoline, zinc dimethyldithiocarbamate, benzimidazole, 3- (3,4-dichlorophenyl) -1, 3, Selected from the group consisting of 1-dimethylurea and combinations thereof; and
Applying the antimicrobial coating composition to at least one surface of the paper using the calender stack.
[Supplementary Note 7]
An antimicrobial coating composition comprising 1% to 10% non-ionic polymerized siloxane and 1% to 10% non-water soluble bactericide, wherein the non-water soluble bactericide is 3-iodo-2-propynyl butylcarbamate. , Pyrithione zinc, zinc oxide, azoxystrobin, thiabendazole, octylisothiazoline, dichloro-octylisothiazoline, zinc dimethyldithiocarbamate, benzimidazole, 3- (3,4-dichlorophenyl) -1,1-dimethylurea and their combinations An antimicrobial coating composition selected from the group consisting of
[Supplementary Note 8]
8. The antimicrobial coating composition according to appendix 7, further comprising a binder selected from the group consisting of carboxymethylcellulose, polyvinyl alcohol, styrene acrylic latex, styrene butadiene, casein and starch.
[Supplementary Note 9]
A gypsum panel comprising a gypsum core sandwiched between two sheets of a front board and a back board, the two sheets of paperboard each having a surface side and a bottom side, and the bottom side and a slurry of the gypsum being in proximity A gypsum panel coated on the surface side using the antimicrobial coating composition according to Appendix 7.

Claims (9)

An antifungal paper coated on at least one surface with an antimicrobial coating composition comprising 1% to 10% of a polymerized siloxane and 1% to 10% of a water insoluble bactericide, said water insoluble bactericide There butylcarbamate 3-iodo-2-Puropini Le, zinc pyrithione, zinc oxide, azoxystrobin, thiabendazole, octyl isothiazolin, dichloro - octyl isothiazolin, zinc dimethyldithiocarbamate, benzimidazole, 3- (3,4-dichlorophenyl 2.) Mold resistant paper selected from the group consisting of -1, 1 -dimethyl urea and combinations thereof. The antifungal paper according to claim 1, wherein the polymerized siloxane is a compound having a chemical formula [R ₂ SiO] _n , wherein "n" in the chemical formula represents the number of repetitions of the R ₂ SiO unit in the polymer. Wherein said two R groups can each be the same or different, said R groups being each selected from the group consisting of hydrogen, halogen, methyl, ethyl and phenyl. Antifungal sheet according to claim 1, wherein the paper is a multi-layer paper said.   The antifungal paper according to claim 1, wherein the germicide comprises particles, and 90% or more of the particles are more than 1 micron and less than 15 microns.   The paper according to claim 1, further comprising a binder selected from the group consisting of carboxymethyl cellulose, polyvinyl alcohol, styrene acrylic latex, styrene butadiene, casein and starch. A method of making a mold resistant multi-layer paper, said method feeding said paper into a calender stack;
Providing an antimicrobial coating composition comprising 1% to 10% non-ionic polymerized siloxane and 1% to 10% non-water soluble bactericide to the calendar stack, wherein the non-water soluble bactericide is butyl carbamine acid 3-iodo-2-Puropini Le, zinc pyrithione, zinc oxide, azoxystrobin, thiabendazole, octyl isothiazolin, dichloro - octyl isothiazolin, zinc dimethyldithiocarbamate, benzimidazole, 3- (3,4-dichlorophenyl) -1 , 1-Dimethylurea and combinations thereof; and applying the antimicrobial coating composition to at least one surface of the paper using the calendar stack. An antimicrobial coating composition comprising 1% to 10% non-ionic polymerized siloxane and 1% to 10% non-water soluble bactericide, wherein the non-water soluble bactericide is butyl carbamic acid 3-iodo-2-propyne Zinc , pyrithione zinc, zinc oxide, azoxystrobin, thiabendazole, octylisothiazoline, dichloro-octylisothiazoline, zinc dimethyldithiocarbamate, benzimidazole, 3- (3,4-dichlorophenyl) -1,1-dimethylurea and theirs An antimicrobial coating composition selected from the group consisting of combinations.   8. The antimicrobial coating composition of claim 7, further comprising a binder selected from the group consisting of carboxymethylcellulose, polyvinyl alcohol, styrene acrylic latex, styrene butadiene, casein and starch.   A gypsum panel comprising a gypsum core sandwiched between two sheets of a front board and a back board, the two sheets of paperboard each having a surface side and a bottom side, and the bottom side and a slurry of the gypsum being in proximity A gypsum panel coated on the surface side using the antimicrobial coating composition according to claim 7.