JP2004115978A

JP2004115978A - Water-resistant mildewproof paper

Info

Publication number: JP2004115978A
Application number: JP2002284561A
Authority: JP
Inventors: Tomofumi Narishima; 成島　倫史; Jun Yashiro; 八代　洵
Original assignee: Nippon Paper Industries Co Ltd; Jujo Paper Co Ltd
Current assignee: Nippon Paper Industries Co Ltd; Jujo Paper Co Ltd
Priority date: 2002-09-27
Filing date: 2002-09-27
Publication date: 2004-04-15

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-resistant mildewproof paper having good mildewproof property and water-resistance and used in a field to require water resistance. <P>SOLUTION: The water-resistant mildewproof paper is produced by coating one or both surfaces of a water-resistant base paper with an aqueous dispersion of a mildewproofing agent using an olefin-maleic acid copolymer salt as the dispersing agent for the water-dispersible mildewproof agent or including the aqueous dispersion of the mildewproofing agent in at least one layer of a multi-ply paper. The water resistance of the water-resistant mildewproof paper preferably satisfies a cross-section impregnation of ≤200 mg/cm<SP>2</SP>and a Cobb water-absorption of ≤30 g/m<SP>2</SP>. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は防黴紙、特に耐水性の要求される使用分野において、良好な防黴性と耐水性を併せ持つ耐水性防黴紙を提供するものである。
【０００２】
【従来の技術】
防黴紙は農業用の紙製のマルチシート、紙製の育苗セルトレー、育苗ポット用の原紙等の農業用資材、あるいは壁紙用裏打ち紙、及び紙壁紙用上層紙及び襖紙、障子紙等の建材用、食品搬送用の段ボール原紙、板紙等に用いられている。
【０００３】
防黴紙は一般的には抄紙時に防黴剤を内添する方法、あるいは抄紙工程のサイズプレス、キャレンダ−サイズプレス、ブレード、バー、エアーナイフなどの塗工機での表面塗工による防黴剤を外添する方法によって防黴性の付与が行われている。また、成紙後の原紙についても前述の塗工機により防黴剤付与が行われる場合もある。
【０００４】
紙用の防黴剤としては、水不溶性の防黴剤粒子を分散させた水分散型防黴剤が多く広く使用されているが、これらの水分散型防黴剤は防黴剤分散液の製造時や保存時、及び実際の使用時において防黴剤の沈降や凝集を防止し、分散効果を保つため分散剤が用いられている。分散剤としては、アニオン系ではナフタリンスルホン酸のホルマリン縮合物、リグニンスルホン酸類等、また非イオン系ではポリオキシエチレンアルキルエーテル類、ポリオキシエチレンアルキルフェニルエーテル類等、また有機高分子系分散剤ではポリアクリル酸ナトリウム等のポリアクリル酸のアルカリ金属塩等が広く使用されている。特に水不溶性の防黴剤に使用する分散剤としては、例えば、カルボキシル基含有セルロース等が提案されている（例えば、特許文献１参照。）。
【０００５】
また、多層抄き紙に対して防黴剤を付与する方法として、防黴剤を澱粉とともに水分散液として、層間に抄き合わせ前に噴霧することが提案されている（例えば、特許文献２参照。）。
【０００６】
【特許文献１】
特開２０００−１５４１０５号公報（請求項６）
【特許文献２】
特開平１０−９６１９５号公報（請求項２）
【０００７】
【発明が解決しようとする課題】
しかしながら、これらの分散剤を含んだ防黴剤の水分散液を基紙表面に防黴剤液単独、あるいは塗料中に添加して塗工した場合、分散剤が親水性物質のため基紙に分散剤が浸透し基紙の耐水性を低下させたり、塗工層の耐水性を低下させるなど問題がある。また、耐水性の多層抄き板紙等において抄紙時のワイヤー抄き合わせ直前の層間に防黴剤の水分散液を噴霧する場合、前述の水分散型防黴剤は断面浸透を低下させる。従って、高度な耐水性を要求される用途においては、水分散型防黴剤を添加しても耐水性を劣化させない分散剤が求められている。
【０００８】
本発明は、水分散型の防黴剤を紙に塗工、あるいは噴霧処理により紙に防黴性を付与した場合において、良好な防黴性と耐水性を両立出来る耐水性防黴紙の提供を課題とした。
【０００９】
【課題を解決するための手段】
本発明者らは、水分散型の防黴剤に対する分散効果が良好で、防黴紙の耐水性を低下させない分散剤について鋭意検討した結果、特定のオレフィン・マレイン酸共重合体の塩を分散剤として用いることで課題を解決できることを見出した。
【００１０】
【発明の実施の形態】
本発明者らは、水分散型の防黴剤に対する分散効果が良好で、かつ耐水性を低下させない種々の分散剤について検討した結果、分散剤としてオレフィン・マレイン酸共重合体の塩、好ましくはアルカリ金属塩を用いることで課題を解決できることを見出した。特に２，５−Ｆｕｒａｎｄｉｏｎｅ，ｐｏｌｙｍｅｒ　ｗｉｔｈ　２，４，４−ｔｒｉｍｅｔｈｙｌｐｅｎｔｅｎｅ，ｓｏｄｉｕｍ　ｓａｌｔ（分子式Ｃ_８Ｈ_１６（Ｃ_４Ｈ_２Ｏ_３）ｘ．ｘＮａ、ＣＡＳ番号３７１９９−８１−８）は優れた分散効果を示し、耐水性を低下させない。
【００１１】
本発明で使用が可能な水分散型防黴剤としては、イミダゾール系、塩素化フェノール系、ニトリル系、チアゾール系化合物の単独、あるいは複合体、及び防黴剤を顔料等に吸着担持した防黴剤等が挙げられる。これら防黴剤の微粒子を分散剤としてオレフィン・マレイン酸共重合体の塩を予め水に溶解した系に添加し攪拌するか、先に水に防黴剤の微粒子を添加しその後攪拌しながら前記分散剤を加え分散する方法があるが、どちらの方法でも良好な分散効果が得られる。また、防黴剤の添加量としては、使用する目的・用途によって適宜決定されればよく、特に限定されるものではない。例えば、本発明の耐水性防黴紙を育苗ポットや農業用マルチシート等に使用する場合は、防黴剤の添加量は紙基材に対して０．０５重量％〜３重量％の範囲が好ましい。０．０５重量％以下であると防黴性が不十分である。３重量％を超えると育苗中の防黴性は得られるが、移植放置後の生分解が妨げられ、何時までも地中に残存し好ましくない。
【００１２】
また、分散剤の添加量としては防黴剤固形分に対して０．０１重量％以上１重量％以下が好適である。０．０１重量％未満であると良好な分散効果が得られない。１重量％を超えて添加しても分散効果の向上は頭打ちとなり、コスト上昇を招くだけである。また、他の添加物として耐水効果を劣化させない範囲で、分散効果を高めるために保護コロイド成分としてガードラン、グルコマンナン、澱粉、キサンタンガム等の高分子多糖類、カルボキシルメチルセルロース、ポリビニルアルコール等の合成水溶性高分子の併用が可能である。
【００１３】
本発明の耐水性防黴紙は、耐水性としては断面浸透が２００ｍｇ／ｃｍ^２以下で、かつコブ吸水度は３０ｇ／ｍ^２であることが望ましい。断面浸透は紙の断面からの水の浸透の程度を表し、コブ吸水度は紙の表面からの水の浸透の程度を表すもので、本発明の耐水性防黴紙は両方の耐水性を兼ね備えていることが重要である。例えば、紙表面にスチレン・アクリル共重合体の耐水性樹脂を塗工してコブ吸水度が５ｇ／ｍ^２であっても、断面浸透が３００ｍｇ／ｃｍ^２であれば、水中に放置しても表面からの水の浸透はほとんど無いが、紙断面からの水の浸入により紙力やコワサが低下するため耐水性紙としての性能が低下し問題がある。
【００１４】
上記断面浸透は、紙試料の両面に２５μｍ厚のポリエステル粘着テープを貼り付け、４ｃｍ角に切断した試験片を、２３℃の水に２４時間浸漬し、４辺の端部から浸透した水の量を求め、予め測定しておいた紙厚から単位断面積当たりの水の吸収量（ｍｇ／ｃｍ^２）として表したものである。
【００１５】
本発明の水分散型防黴剤を耐水性基紙へ付与する方法としては、水分散型防黴剤の水分散液を基紙の片面あるいは両面に塗工すればよい。塗工方法としては、抄紙工程でのオン塗工、あるいは抄紙後のオフ塗工のいずれもが可能である。塗工機としては、サイズプレスコーター、ブレードコーター、フィルムトランスファーコーター、ゲートロールコーター、バーコーター、エアーナイフコーター等の既知の塗工機で塗工が可能である。
【００１６】
また、耐水性基紙が多層紙である場合、水分散型防黴剤を少なくとも１層に含有させてもよい。多層紙の製造においては抄紙ワイヤーでの抄き合わせ直前に層間強度改善の目的でバインダーを付与するためにスプレーが設置されており、このスプレーによって水分散型防黴剤の水分散液を噴霧することにより添加してもよい。スプレーによる防黴剤の付与は多層紙の１層以上に行えば特に制限はないが、多層紙の中層より表層側に近い層に付与する方がより少ない防黴剤添加率でも良好な防黴性が得られる。
【００１７】
本発明の水分散系防黴剤液には、耐水性、防黴性を損なわない範囲で表面サイズ剤、紙力向上剤、バインダー、無機・有機顔料、染料等を併用することが可能である。
【００１８】
本発明の耐水性防黴紙は、耐水性と防黴性の両方が求められる農業用のマルチシート、育苗セルトレー、育苗ポット用の原紙等の農業用資材、あるいは壁紙用裏打ち紙、及び紙壁紙用上層紙及び襖紙、障子紙等の建材用途、食品搬送用の段ボール原紙、板紙等に好適に用いられる。
【００１９】
【実施例】
以下に、実施例にて本発明を詳細に説明するが、本発明はこれらに限定されるものではない。実施例及び比較例で得た耐水性防黴紙について、以下の項目について行った。
【００２０】
＜評価方法＞
・断面浸透：耐水性防黴紙を２３℃、５０％Ｒ／Ｈの雰囲気で調湿後、両面に２５μｍ厚のポリエステル粘着テープを貼合し、４ｃｍ×４ｃｍに裁断し試料とした。２３℃の水に２４時間試料を浸漬後、下記の式にて断面浸透を求めた。
断面浸透（ｍｇ／ｃｍ^２）＝（Ｂ−Ａ）×１００／（１６０×Ｃ）
ここで、Ａ；浸漬前の耐水性防黴紙の重量（ｍｇ）、Ｂ；浸漬後の耐水性防黴紙の重量（ｍｇ）、Ｃ；テープ貼合前の耐水性防黴紙の厚さ（ｍｍ）である。
・コブ吸水度：ＪＩＳ　Ｐ８１４０に準じた。ただし吸水時間は２分とした。
・防黴性評価：ＪＩＳ　Ｚ２９１１に準じて、下記の条件で行った。
＊試験に供した黴：Ａｓｐｅｒｇｉｌｌｕｓ　ｎｉｇｅｒ　ＦＥＲＭ　Ｓ−１、Ｐｅｎｉｃｉｌｌｕｍ　ｃｉｔｒｉｎｕｍＦＥＲＭ　Ｓ−５の混合懸濁液を用いた。
＊培地：ばれいしょ−ブドウ糖−寒天培地
＊培養雰囲気：３５℃、９０％Ｒ／Ｈの恒温恒湿
＊培養期間：１週間
防黴性の評価は、１（試料に接種した黴の発育面積が１／３を超える。）、２（試料に接種した黴の発育面積が１／３を超えない。）、３（試料に接種した黴の発育が認められない。）の３段階で評価した。
【００２１】
［実施例１］
予め分散剤としてオレフィン・マレイン酸共重合物ナトリウムである２，５−Ｆｕｒａｎｄｉｏｎｅ，ｐｏｌｙｍｅｒ　ｗｉｔｈ　２，４，４−ｔｒｉｍｅｔｈｙｌｐｅｎｔｅｎｅ，ｓｏｄｉｕｍ　ｓａｌｔ（Ｃ_８Ｈ_１６．Ｃ_４Ｈ_２Ｏ_３ｘ．ｘＮａ）の０．０５重量％水溶液を作成し、ホモジナイザーで攪拌しながら平均粒子径５μｍの防黴剤２−（４−チアゾイル）−ベンズイミダゾールを分散剤液に添加し防黴剤濃度２０重量％の防黴剤分散液を作成した。調製後の防黴剤液の分散性は放置後防黴剤の沈降、凝集等が無く良好であった。次に坪量２２０ｇ／ｍ^２の５層抄き耐水性板紙（断面浸透１５０ｍｇ／ｃｍ^２、コブ吸水度２５ｇ／ｍ^２）を基紙とし、バー塗工により前記防黴剤分散液を耐水板紙両面に片面当たり吸液量が０．７５液ｇ／ｍ^２毎（両面当たり１．５液ｇ／ｍ^２）となるように塗工し耐水性防黴紙を作成した。この耐水性防黴紙について断面浸透、コブ吸水度、及び防黴性を評価し、結果を表１に示した。
【００２２】
［実施例２］
実施例１で使用した５層抄き耐水性板紙の抄造時に表側１層目と２層目の層間にスプレーにより実施例１で使用した防黴剤分散液を防黴剤付着量が１．５液ｇ／ｍ^２となるように付与した以外は、実施例１と同様にして耐水性防黴紙を作成し、断面浸透、コブ吸水度、及び防黴性を評価し、結果を表１に示した。
【００２３】
［比較例１］
分散剤をポリアクリル酸ナトリウムに変えた以外は、実施例１と同様に防黴剤分散液を作成し、評価を行った。
【００２４】
［比較例２］
比較例１の防黴剤液を用いた以外、実施例２と同様に耐水性防黴紙を作成し、評価を行った。
【００２５】
［比較例３］
実施例１で使用した耐水性板紙について、断面浸透、コブ吸水度、及び防黴性を評価し、結果を表１に示した。
【００２６】
【表１】

表１に示されるように、実施例１及び２の特定のオレフィン・マレイン酸共重合物ナトリウムを分散剤として使用した耐水性防黴紙の断面浸透及びコブ吸水度は、原紙として使用した比較例３の耐水性板紙と同等で良好な耐水性を示した。これに対して、比較例１及び２のポリアクリル酸ナトリウムを分散剤として使用した耐水性防黴紙は、断面浸透及びコブ吸水度が低下し、耐水性の点で問題があった。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a fungicidal paper, particularly a water-resistant fungicidal paper having both good fungicidal properties and good water resistance in a field of use requiring water resistance.
[0002]
[Prior art]
Anti-mold paper is used for agricultural materials such as paper multi-sheets for agriculture, paper seedling cell trays, base paper for seedling pots, or backing paper for wallpaper, top layer paper for paper wallpaper, fusuma paper, shoji paper, etc. Used for building materials, corrugated board for food transportation, paperboard, etc.
[0003]
In general, antifungal paper is prepared by internally adding an antifungal agent during papermaking, or by surface coating with a coating machine such as a size press, calender size press, blade, bar, or air knife in the papermaking process. An antifungal property is imparted by a method of externally adding an agent. In some cases, the antifungal agent may be applied to the base paper after forming by the coating machine described above.
[0004]
As a fungicide for paper, a water-dispersible fungicide in which water-insoluble fungicide particles are dispersed is widely used. Dispersants are used to prevent settling and aggregation of the fungicide during production, storage, and actual use, and to maintain a dispersing effect. Examples of the dispersing agent include a formalin condensate of naphthalenesulfonic acid and ligninsulfonic acid in the anionic system, polyoxyethylene alkyl ethers and polyoxyethylene alkylphenyl ethers in the nonionic system, and an organic polymer dispersing agent. Alkali metal salts of polyacrylic acid such as sodium polyacrylate are widely used. In particular, as a dispersant used for a water-insoluble fungicide, for example, carboxyl group-containing cellulose and the like have been proposed (for example, see Patent Document 1).
[0005]
Further, as a method of applying a fungicide to a multilayer paper, it has been proposed to spray the fungicide together with starch as an aqueous dispersion before lamination between layers (for example, Patent Document 2). reference.).
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-154105 (Claim 6)
[Patent Document 2]
JP-A-10-96195 (Claim 2)
[0007]
[Problems to be solved by the invention]
However, when an aqueous dispersion of an antifungal agent containing these dispersants is coated on the surface of the base paper, alone or added to the paint, the dispersant is a hydrophilic substance and is applied to the base paper. There is a problem that the dispersing agent permeates and lowers the water resistance of the base paper and the water resistance of the coating layer. In the case of spraying an aqueous dispersion of a fungicide between the layers immediately before lamination at the time of paper making in a water-resistant multilayer paperboard or the like, the above-mentioned water-dispersed fungicide reduces cross-sectional penetration. Therefore, for applications requiring high water resistance, a dispersant that does not deteriorate the water resistance even when a water-dispersed fungicide is added is required.
[0008]
The present invention provides a water-resistant and anti-fungal paper that can achieve both good anti-fungal properties and water resistance when a paper is coated with a water-dispersed fungicide or imparted to the paper by spray treatment. Was an issue.
[0009]
[Means for Solving the Problems]
The present inventors have conducted intensive studies on a dispersant that has a good dispersing effect on a water-dispersed fungicide and does not reduce the water resistance of the fungicide paper, and as a result, disperses a specific olefin / maleic acid copolymer salt. It has been found that the problem can be solved by using it as an agent.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The present inventors have studied various dispersants that have a good dispersing effect on a water-dispersed fungicide and do not lower the water resistance, and as a dispersant, a salt of an olefin / maleic acid copolymer, preferably It has been found that the problem can be solved by using an alkali metal salt. In particular 2,5-Furandione, polymer with 2,4,4- trimethylpentene, sodium salt ( molecular formula _{_{_{_{C 8 H 16 (C 4 H}}}} 2 O 3) x.xNa, CAS No. 37199-81-8) has excellent dispersing effect And does not lower the water resistance.
[0011]
Examples of the water-dispersible fungicide that can be used in the present invention include imidazole, chlorinated phenol, nitrile, and thiazole compounds alone or in combination, and a fungicide obtained by adsorbing and supporting a fungicide on a pigment or the like. Agents and the like. The fine particles of the antifungal agent are added to a system in which a salt of an olefin / maleic acid copolymer is previously dissolved in water as a dispersant and stirred, or the fine particles of the antifungal agent are added to water first, and then the mixture is stirred. There is a method of adding and dispersing a dispersant, and both methods can provide a good dispersion effect. The amount of the fungicide to be added may be appropriately determined depending on the purpose and application to be used, and is not particularly limited. For example, when the water-resistant fungicidal paper of the present invention is used in a seedling pot, an agricultural multi-sheet, or the like, the amount of the fungicide added is in the range of 0.05% by weight to 3% by weight based on the paper base material. preferable. When the content is less than 0.05% by weight, the antifungal property is insufficient. If the amount exceeds 3% by weight, fungicidal properties in the seedlings can be obtained, but biodegradation after transplantation is hindered and undesirably remains in the ground forever.
[0012]
The dispersant is preferably added in an amount of 0.01% by weight or more and 1% by weight or less based on the solid content of the fungicide. If it is less than 0.01% by weight, a good dispersing effect cannot be obtained. Even if added in excess of 1% by weight, the improvement of the dispersing effect reaches a plateau and only increases the cost. In addition, as long as the water-resistant effect is not deteriorated as other additives, in order to increase the dispersing effect, synthetic water-soluble polymers such as high-molecular polysaccharides such as guardrun, glucomannan, starch, xanthan gum, carboxymethylcellulose, and polyvinyl alcohol are used as protective colloid components. Polymers can be used in combination.
[0013]
The water-resistant and fungicidal paper of the present invention desirably has a water resistance of 200 mg / cm ² or less in cross section and a water absorption of 30 g / m ² . The cross-section penetration indicates the degree of water penetration from the cross section of the paper, and the knot water absorption indicates the degree of water penetration from the surface of the paper.The water-resistant and fungicidal paper of the present invention has both water resistance. It is important that For example, even if the paper surface is coated with a water-resistant resin of a styrene-acrylic copolymer and the Cobb's water absorption is 5 g / m ² , if the cross-section penetration is 300 mg / cm ^2, it can be left in water. Although there is almost no permeation of water from the surface, there is a problem in that the performance as a water-resistant paper is reduced because the paper strength and the roughness are reduced due to the penetration of water from the paper cross section.
[0014]
The cross-sectional penetration was measured by applying a 25 μm-thick polyester adhesive tape on both sides of a paper sample, cutting a 4 cm square test piece into water at 23 ° C. for 24 hours, and permeating the water from the four edges. Is determined and expressed as the amount of water absorbed per unit cross-sectional area (mg / cm ² ) from the previously measured paper thickness.
[0015]
As a method for applying the water-dispersed fungicide of the present invention to a water-resistant base paper, an aqueous dispersion of the water-dispersed fungicide may be applied to one or both sides of the base paper. As a coating method, either on-coating in the papermaking process or off-coating after papermaking is possible. As a coating machine, coating can be performed with a known coating machine such as a size press coater, a blade coater, a film transfer coater, a gate roll coater, a bar coater, and an air knife coater.
[0016]
When the water-resistant base paper is a multilayer paper, at least one layer may contain a water-dispersed fungicide. In the production of multi-layered paper, a spray is provided just before lamination with a papermaking wire to provide a binder for the purpose of improving the interlayer strength, and the spray is used to spray an aqueous dispersion of an aqueous dispersion type fungicide. May be added. The application of the fungicide by spraying is not particularly limited as long as it is applied to at least one layer of the multilayer paper, but it is better to apply the fungicide to a layer closer to the surface side than the middle layer of the multilayer paper. Property is obtained.
[0017]
The water-dispersed fungicide liquid of the present invention can be used in combination with a surface sizing agent, a paper strength improver, a binder, an inorganic / organic pigment, a dye, etc., as long as the water resistance and the fungicide resistance are not impaired. .
[0018]
The water-resistant and fungicidal paper of the present invention is an agricultural material such as a multi-sheet for agriculture, a nursery cell tray, a base paper for a nursery pot, or a backing paper for wallpaper, and a paper wallpaper for which both water resistance and fungicide are required. It is suitably used for building materials such as upper layer paper for paper, fusuma paper, shoji paper, corrugated board for food transportation, paperboard, etc.
[0019]
【Example】
Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. The following items were performed on the water-resistant and fungicidal paper obtained in the examples and comparative examples.
[0020]
<Evaluation method>
Cross-sectional penetration: Water-resistant fungicidal paper was humidified in an atmosphere of 23 ° C. and 50% R / H, and a polyester adhesive tape having a thickness of 25 μm was stuck on both sides and cut into 4 cm × 4 cm to obtain a sample. After immersing the sample in water at 23 ° C. for 24 hours, the cross-sectional penetration was determined by the following equation.
Cross section penetration (mg / cm ² ) = (BA) × 100 / (160 × C)
Here, A: weight (mg) of the water-resistant and mildewproof paper before immersion, B: weight (mg) of the waterproof and mildewproof paper after immersion, and C: thickness of the waterproof and mildewproof paper before tape bonding. (Mm).
Cobb water absorption: conformed to JIS P8140. However, the water absorption time was 2 minutes.
-Evaluation of antifungal property: It was carried out under the following conditions in accordance with JIS Z2911.
* Mold used in the test: A mixed suspension of Aspergillus niger FERM S-1 and Penicillum citrinum FERM S-5 was used.
* Medium: potato-glucose-agar medium * Culture atmosphere: constant temperature and humidity of 35 ° C, 90% R / H * Culture period: 1 week Evaluation of antifungal property is 1 (the growth area of mold inoculated to the sample is 1 / 3) (2) (the growth area of the mold inoculated in the sample does not exceed 1/3), and 3 (the growth of the mold inoculated in the sample is not observed).
[0021]
[Example 1]
As a dispersing agent, sodium olefin / maleic acid copolymer sodium 2,5-furandione, polymer with 2,4,4-trimethylpentene, sodium salt (C ₈ H ₁₆ .C ₄ H ₂ O ₃ x.xNa) is used in advance. A 0.05% by weight aqueous solution was prepared, and while stirring with a homogenizer, a fungicide 2- (4-thiazoyl) -benzimidazole having an average particle size of 5 μm was added to the dispersant solution, and a fungicide having a fungicide concentration of 20% by weight was added. A dispersion was made. The dispersibility of the fungicide solution after the preparation was good without sedimentation or aggregation of the fungicide after standing. Next, a five-layer water-resistant paperboard having a basis weight of 220 g / m ² (permeation in cross section of 150 mg / cm ² , Cobb water absorption of 25 g / m ² ) was used as a base paper, and the antifungal agent dispersion was coated by bar coating. Coating was performed on both sides such that the liquid absorption amount per one side was 0.75 liquid g / m ² (1.5 liquid g / m ² per both sides) to prepare a water-resistant and fungicidal paper. This water-resistant and fungicidal paper was evaluated for cross-sectional penetration, knotted water absorption, and fungicide resistance. The results are shown in Table 1.
[0022]
[Example 2]
When the five-layer water-resistant paperboard used in Example 1 was made, the fungicide dispersion liquid used in Example 1 was sprayed between the first and second layers on the front side so that the amount of the fungicide adhered was 1.5. A water-resistant and fungicidal paper was prepared in the same manner as in Example 1 except that the solution was applied so as to obtain a liquid g / m ^2, and the cross-sectional penetration, the bump water absorption, and the fungicide resistance were evaluated. Indicated.
[0023]
[Comparative Example 1]
A fungicide dispersion was prepared and evaluated in the same manner as in Example 1 except that the dispersant was changed to sodium polyacrylate.
[0024]
[Comparative Example 2]
A water-resistant and fungicidal paper was prepared and evaluated in the same manner as in Example 2 except that the fungicide solution of Comparative Example 1 was used.
[0025]
[Comparative Example 3]
The water-resistant paperboard used in Example 1 was evaluated for cross-sectional penetration, bump water absorption, and fungicide resistance. The results are shown in Table 1.
[0026]
[Table 1]

As shown in Table 1, the cross-sectional permeation and water absorption of the water-resistant fungicidal paper using the specific sodium olefin / maleic acid copolymer of Examples 1 and 2 as a dispersant were compared with those of the comparative examples using the base paper. No. 3 showed good water resistance equivalent to that of the water resistant paperboard. On the other hand, the water-resistant and mildewproof papers of Comparative Examples 1 and 2 using sodium polyacrylate as a dispersant had problems in terms of water resistance due to reduced cross-sectional penetration and cobb water absorption.

Claims

A water-resistant and fungicidal paper containing a water-dispersed fungicide, wherein a salt of an olefin / maleic acid copolymer is used as a dispersant for the fungicide.

^2. The water-resistant and fungicidal paper according to claim 1, wherein the cross-sectional penetration is 200 mg / cm ² or less, and the knot water absorption is 30 g / m ² or less.

The water-resistant fungicidal paper according to claim 1 or 2, wherein an aqueous dispersion containing the water-dispersible fungicide is applied to one or both sides of the water-resistant base paper.

3. The water-resistant and fungicidal paper according to claim 1, wherein the water-resistant and fungicidal paper is a multilayer paper, and at least one layer contains a water-dispersed fungicide.