JP2001158074A - Water absorption sheet - Google Patents
Water absorption sheetInfo
- Publication number
- JP2001158074A JP2001158074A JP34244699A JP34244699A JP2001158074A JP 2001158074 A JP2001158074 A JP 2001158074A JP 34244699 A JP34244699 A JP 34244699A JP 34244699 A JP34244699 A JP 34244699A JP 2001158074 A JP2001158074 A JP 2001158074A
- Authority
- JP
- Japan
- Prior art keywords
- water
- absorbing
- melt adhesive
- absorbing polymer
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は吸収性物品に関する
ものである。さらに詳しくは、本発明は、各種液体吸い
取り用途において使用を容易にした吸収性の優れた吸収
性物品に関するものである。The present invention relates to an absorbent article. More specifically, the present invention relates to an absorbent article having excellent absorbability, which is easily used in various liquid absorbing applications.
【０００２】[0002]
【従来の技術】古くから、紙、布、不織布などの素材が
吸水用途に使われてきた。近年になって吸水性高分子を
用いた吸収物品の出現で非常に小さなボリュームで多量
の水を吸い取ることができるような吸水シートの設計が
可能になった。2. Description of the Related Art For a long time, materials such as paper, cloth and nonwoven fabric have been used for water absorption. In recent years, with the advent of absorbent articles using a water-absorbing polymer, it has become possible to design a water-absorbing sheet that can absorb a large amount of water with a very small volume.
【０００３】吸水性樹脂を用いた吸収物品として特開昭
５９―１３０３０１号公報に記載のように、吸水紙に吸
収性高分子を付着させた吸水シートが知られている。ま
た、特開昭５９−００９６１９号公報に記載のように、
２枚の薄葉吸水紙の間に吸水性高分子を配置した吸水シ
ートが知られている。As an absorbent article using a water-absorbing resin, a water-absorbing sheet in which an absorbent polymer is adhered to water-absorbing paper is known, as described in JP-A-59-130301. Further, as described in JP-A-59-009619,
A water-absorbing sheet in which a water-absorbing polymer is disposed between two thin-leaf water-absorbing papers is known.
【０００４】前記特開昭５９―１３０３０１号公報に記
載の吸水シートにおいて、吸水性高分子の付着の方法と
して、吸水紙を水に濡らして吸水性高分子を振り掛ける
ことで接着したり、糊や合成接着剤を用いる方法が開示
されているが、これらの方法では吸水して数十倍にも体
積膨張した吸水性高分子を固定することはできず、ひと
たび吸水すると、吸水性高分子が吸水紙から外れて、外
力が掛かれば吸水性高分子が脱落しまうといった問題が
あった。In the water-absorbing sheet described in JP-A-59-130301, as a method for adhering a water-absorbing polymer, a water-absorbing paper is wetted with water and sprinkled with the water-absorbing polymer, and the adhesive is applied. And methods using synthetic adhesives are disclosed.However, these methods cannot fix the water-absorbing polymer which has absorbed water and has a volume expansion of several tens of times. There is a problem that the water-absorbing polymer falls off if it is detached from the water-absorbing paper and an external force is applied.
【０００５】前記特開昭５９−００９６１９号公報に記
載の吸水シートでも吸水性高分子が固定されていないの
で、吸水性高分子が偏り、確実な吸液ができないことい
う問題があった。これらの点を解決するためには、吸水
性高分子が吸水しても基材との結合が保持できるような
固定方法が必要とされる。[0005] Even in the water-absorbing sheet described in JP-A-59-009619, since the water-absorbing polymer is not fixed, there has been a problem that the water-absorbing polymer is biased and liquid cannot be reliably absorbed. In order to solve these problems, a fixing method is required that can maintain the bond with the substrate even when the water-absorbing polymer absorbs water.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、従来
の吸水シートの問題点である、吸水性高分子が吸水後に
シートから剥がれてしまうという問題点を改善し、幅広
い用途に適した吸水シートを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to improve the problem of the conventional water-absorbing sheet, that is, the problem that the water-absorbing polymer is peeled off from the sheet after absorbing water, and the water-absorbing sheet is suitable for a wide range of applications. To provide a seat.
【０００７】[0007]
【課題を解決するための手段】かかる現状に鑑み、われ
われは吸水性高分子を固定する方法として、反応型ホッ
トメルト接着剤に着目し、吸水性高分子を粘着性によっ
て物理的に固定するだけではなく、吸水性高分子と反応
して強固な接着を得れば課題を解決することができると
いう結論に至った。本発明は次の各発明を包含する。In view of this situation, as a method of fixing a water-absorbing polymer, we focus on a reactive hot-melt adhesive and only physically fix the water-absorbing polymer by adhesiveness. Rather, they concluded that the problem could be solved if they could react with the water-absorbing polymer to obtain strong adhesion. The present invention includes the following inventions.
【０００８】（１）目付け５〜２００ｇ／ｍ2 の不織布
又はフィルムよりなる基材上に、主成分がイソシアネー
ト基末端ウレタンプレポリマーである反応型ホットメル
ト接着剤が塗工され、その上にカルボキシル基を含む吸
水性高分子が３０〜４００ｇ／ｍ2 配置され、前記反応
型ホットメルト接着剤によって固定保持されたことを特
徴とする吸水シート。(1) A reactive hot-melt adhesive whose main component is an isocyanate-terminated urethane prepolymer is coated on a base material made of a nonwoven fabric or a film having a basis weight of 5 to 200 g / m 2 , A water-absorbent sheet, wherein a water-absorbing polymer having a group is arranged in an amount of 30 to 400 g / m 2 and fixed and held by the reactive hot-melt adhesive.
【０００９】（２）目付け５〜２００ｇ／ｍ2 の不織布
又はフィルムよりなる基材上に主成分がイソシアネート
基末端ウレタンプレポリマーである反応型ホットメルト
接着剤が塗工され、その上にカルボキシル基を含む吸水
性高分子が３０〜４００ｇ／ｍ 2 配置され、前記反応型
ホットメルト接着剤によって固定保持されており、さら
に前記吸水性高分子の上面に親水性の不織布からなる表
面材が配置されていることを特徴とする吸水シート。 （３）前記基材と前記表面材の相対する部分が接着され
ていて、前記吸水性高分子を包み込んだ袋体が形成され
ていることを特徴とする（２）に記載の吸水シート。(2) Basis weight 5-200 g / mTwoNon-woven
Or the main component is isocyanate on a film base
Reactive hot melt, which is a terminal urethane prepolymer
Adhesive is applied and water absorption containing carboxyl groups on it
30-400 g / m TwoPlaced and said reaction type
It is fixed and held by hot melt adhesive,
A table consisting of a hydrophilic nonwoven fabric on the upper surface of the water-absorbing polymer
A water-absorbing sheet, wherein face materials are arranged. (3) The opposing portions of the base material and the surface material are adhered.
Forming a bag enclosing the water-absorbing polymer.
The water-absorbing sheet according to (2), wherein:
【００１０】[0010]
【発明の実施の形態】本発明の吸水シートは、不織布又
はフィルムより選ばれた基材上に反応性ホットメルト接
着剤によって吸水性高分子が接着固定保持されている構
造を有している。添付図面中の図１〜図３は、本発明の
吸水シートの例を説明するものである。しかし、本発明
はこれらの図面に示された吸水シートに限定されない。BEST MODE FOR CARRYING OUT THE INVENTION The water-absorbing sheet of the present invention has a structure in which a water-absorbing polymer is adhered and held on a substrate selected from a nonwoven fabric or a film by a reactive hot melt adhesive. 1 to 3 in the accompanying drawings illustrate an example of a water-absorbing sheet of the present invention. However, the present invention is not limited to the water absorbing sheets shown in these drawings.
【００１１】図１は、本発明の吸水シートの基本構造の
一例を説明するものである。図１において、基材３は不
織布であり、その上に塗布された反応型ホットメルト接
着剤２によって不織布基材３上に吸水性高分子が接着固
定されている。このように、吸水性高分子が反応型（た
とえば、湿気又は水分を利用した湿気硬化型）のホット
メルト接着剤と互いに反応して結合し、不織布基材に接
着されていると、吸水性高分子が吸水して膨潤した場合
でもホットメルト層から剥離して脱落することがない。FIG. 1 illustrates an example of the basic structure of the water-absorbent sheet of the present invention. In FIG. 1, a substrate 3 is a non-woven fabric, and a water-absorbing polymer is adhered and fixed on the non-woven fabric substrate 3 by a reactive hot melt adhesive 2 applied thereon. As described above, when the water-absorbing polymer reacts with and binds to the reactive type (for example, moisture-curing type using moisture or moisture) hot-melt adhesive and is bonded to the nonwoven fabric substrate, the water-absorbing polymer has a high water-absorbing property. Even when molecules swell due to water absorption, they do not separate from the hot melt layer and fall off.
【００１２】図２及び図３は、実際の使用に適した例を
説明している。図２は、基材としてフィルム基材６、例
えば、ポリエチレンフィルムを用いており、その上に図
１と同様に反応型ホットメルト接着剤２によって吸水性
高分子１を接着固定保持し、その後、吸水性高分子上を
不織布（好ましくは親水化処理した不織布）からなる表
面材４で覆い、表面材４と基材フィルム６が相対する側
縁部をヒートシールすることによって、吸水性高分子を
基材と表面材とで形成した袋状構造の中に包み込んだ吸
水シートを示している。FIGS. 2 and 3 illustrate examples suitable for practical use. FIG. 2 uses a film substrate 6, for example, a polyethylene film, as a substrate, on which a water-absorbent polymer 1 is adhered and held by a reactive hot-melt adhesive 2 as in FIG. The surface of the water-absorbent polymer is covered with a surface material 4 made of a nonwoven fabric (preferably a nonwoven fabric subjected to a hydrophilic treatment), and the side edges of the surface material 4 and the base film 6 facing each other are heat-sealed to remove the water-absorbent polymer. Fig. 2 shows a water-absorbing sheet wrapped in a bag-like structure formed of a base material and a surface material.
【００１３】図３は、基材として不織布基材７を使用
し、所定幅で互いに所定ピッチで離間配置された帯状の
吸水性高分子層１を該基材７上に反応型ホットメルト２
でそれぞれ接着固定保持し、該吸水性高分子層上を親水
化処理した不織布からなる表面材４で覆い、互いに離間
配置されている各吸水性高分子層間及び全体の周縁部で
相対している表面材４と基材７とをヒートシールして形
成している吸水シートを示している。FIG. 3 shows a non-woven fabric base material 7 used as a base material, and a strip-shaped water-absorbing polymer layer 1 having a predetermined width and being spaced apart from each other by a predetermined pitch.
The surface of the water-absorbing polymer layer is covered with a surface treatment 4 made of a non-woven fabric which has been subjected to a hydrophilic treatment. 2 shows a water-absorbing sheet formed by heat sealing a surface material 4 and a base material 7.
【００１４】本発明の吸水シートに使用される反応型ホ
ットメルト接着剤としては、水分で硬化する湿気硬化型
ウレタンプレポリマーを主成分とする接着剤があげられ
る。主成分となるウレタンプレポリマーは、ポリイソシ
アネート化合物（ジフェニルメタンジイソシアネート、
ジメチルジフェニルメタンジイソシアネート、シクロヘ
キシルメタンジイソシアネート、トリレンジイソシアネ
ート、ヘキサメチレンジイソシアネート、キシリレンジ
イソシアネート、ｐ−フェニレンジイソシアネートな
ど）の１種類又は２種類以上を、設定する物性値が得ら
れるように適宜選択すると共に配合比を決定して、これ
らを６０〜１３０℃の加熱下で数時間反応させて得られ
る。The reactive hot melt adhesive used in the water-absorbent sheet of the present invention includes an adhesive mainly composed of a moisture-curable urethane prepolymer which cures with moisture. The main component urethane prepolymer is a polyisocyanate compound (diphenylmethane diisocyanate,
Dimethyldiphenylmethane diisocyanate, cyclohexyl methane diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, p-phenylene diisocyanate, etc.) and one or more of them, as appropriate, so as to obtain the set physical properties, and the mixing ratio. And reacting them under heating at 60 to 130 ° C. for several hours.
【００１５】ウレタンプレポリマーの合成においては、
ポリイソシアネート化合物とポリオールをＮＣＯ基／Ｏ
Ｈ基が１．５より大きく、好ましくは２．１〜２．５の
割合で反応させ、その結果選られたウレタンプレポリマ
ー中のＮＣＯ基が、通常０．５〜１０重量％となるよう
に設計する。これに必要に応じて、通常の配合剤が配合
される。In the synthesis of urethane prepolymer,
NCO group / O
The H groups are reacted at a ratio of greater than 1.5, preferably 2.1 to 2.5, so that the NCO groups in the selected urethane prepolymer are usually 0.5 to 10% by weight. design. If necessary, a usual compounding agent is added.
【００１６】反応型ホットメルト接着剤は、例えば、熱
可塑性ポリマー（ポリウレタン、エチレン系共重合体、
プロピレン系共重合体、塩化ビニル系共重合体、各種ゴ
ム、アクリル系共重合体など）、タッキファイヤー樹脂
（クマロンインデン樹脂、ケトン樹脂、変性スチレン樹
脂、テルペン樹脂、変性テルペン樹脂、水添石油樹脂、
キシレン樹脂、エポキシ樹脂、各種エステル化ロジンな
ど）、可塑剤（ジオクチルフタレート、ブチルベンジル
フタレート、アルキル多環芳香族炭化水素類、塩素化パ
ラフィンなど）、充填剤（炭酸カルシウム、クレー、タ
ルクなど）、顔料、触媒（ジブチルチンジラウレート、
ジブチルチンジオクテート、ジメチルベンジルアミンな
ど）、密着性付与剤、紫外線吸収剤等を配合した系で構
成される。Reactive hot melt adhesives include, for example, thermoplastic polymers (polyurethane, ethylene copolymer,
Propylene copolymer, vinyl chloride copolymer, various rubbers, acrylic copolymer, etc., tackifier resin (coumarone indene resin, ketone resin, modified styrene resin, terpene resin, modified terpene resin, hydrogenated petroleum) resin,
Xylene resins, epoxy resins, various esterified rosins, etc.), plasticizers (dioctyl phthalate, butyl benzyl phthalate, alkyl polycyclic aromatic hydrocarbons, chlorinated paraffins, etc.), fillers (calcium carbonate, clay, talc, etc.), Pigments, catalysts (dibutyltin dilaurate,
Dibutyltin dioctate, dimethylbenzylamine, etc.), an adhesion promoter, an ultraviolet absorber and the like.
【００１７】カルボキシル基を含む吸水性高分子として
は、アクリル酸（塩）重合物をはじめとして、アクリル
酸メチル−酢酸ビニル共重合物、デンプン−アクリル酸
（塩）グラフト共重合体、デンプン−アクリル酸エチル
グラフト共重合体のケン化物、デンプン−メタクリル酸
メチルグラフト共重合体のケン化物、デンプン−アクリ
ロニトリルグラフト共重合体のケン化物、デンプン−ア
クリルアミドグラフト共重合体のケン化物、アクリル酸
で架橋されたポリエチレンオキシドなどがあげられる。Examples of the water-absorbing polymer containing a carboxyl group include acrylic acid (salt) polymer, methyl acrylate-vinyl acetate copolymer, starch-acrylic acid (salt) graft copolymer, and starch-acrylic acid. Saponified ethyl acetate graft copolymer, starch-methyl methacrylate graft copolymer, starch-acrylonitrile graft copolymer, saponified starch-acrylamide graft copolymer, cross-linked with acrylic acid Polyethylene oxide and the like.
【００１８】これらのうち、例えば水などの目的液体を
自重の３０倍以上吸液するものが吸収性能の点から最も
適当である。吸水性高分子の付着量は用途に合わせて３
０〜４００ｇ／ｍ2 の間で設定すればよい。吸水性高分
子が反応型ホットメルト接着剤の塗工パターンにあわせ
て均一に配置されている。吸収性高分子分布量が４００
ｇ／ｍ2 を超えると、吸収性高分子が吸収し膨潤したと
き、ゲルブロックによる通水阻害を発生するため好まし
くない。また３０ｇ／ｍ2 より少ないと吸収力そのもの
が少ないため好ましくない。吸水性高分子の大きさは、
平均粒子径が７５〜１０００μｍであることが好まし
く、３００〜５００μｍであることがより好ましい。粒
子径が７５μｍ未満では吸水シートを製造する際の作業
性が悪くなり、また、１０００μｍを越えて大きくなる
と、吸水性高分子の基材への固定歩留まりが低下する。Of these, for example, the one that absorbs a target liquid such as water at least 30 times its own weight is most suitable from the viewpoint of absorption performance. The amount of adsorbed water-absorbing polymer depends on the application.
What is necessary is just to set between 0 and 400 g / m < 2 >. The water-absorbing polymer is uniformly arranged according to the coating pattern of the reactive hot melt adhesive. Absorbent polymer distribution amount is 400
If it exceeds g / m 2 , when the absorbent polymer absorbs and swells, the blockage of water by the gel block occurs, which is not preferable. On the other hand, if it is less than 30 g / m 2 , the absorbing power itself is small, which is not preferable. The size of the water-absorbing polymer is
The average particle diameter is preferably from 75 to 1000 μm, more preferably from 300 to 500 μm. If the particle diameter is less than 75 μm, the workability in producing the water-absorbing sheet will be poor, and if it exceeds 1000 μm, the yield of fixing the water-absorbing polymer to the substrate will be reduced.
【００１９】本発明における吸水性高分子の固定方法
は、前記のカルボキシル基を有する吸水性高分子とイソ
シアネート基末端ウレタンプレポリマーを主成分とする
反応型ホットメルト接着剤との反応によって成立するも
のである。すなわち、吸水性高分子のカルボキシル基と
ホットメルト接着剤のイソシアネート基が架橋反応する
ことで結合するために、吸水性高分子が吸液してもホッ
トメルト接着剤との界面で容易には剥離しないことを特
徴とする。The method for fixing a water-absorbing polymer in the present invention is established by a reaction between the above-mentioned water-absorbing polymer having a carboxyl group and a reactive hot-melt adhesive mainly containing an isocyanate group-terminated urethane prepolymer. It is. That is, since the carboxyl group of the water-absorbing polymer and the isocyanate group of the hot-melt adhesive are bonded by a cross-linking reaction, even if the water-absorbing polymer absorbs liquid, it easily peels off at the interface with the hot-melt adhesive. It is characterized by not doing.
【００２０】前記ホットメルト接着剤の塗布方法は、通
常の方法で良く、カーテン塗工、スパイラル塗工、シム
塗工、ビード塗工などがあげられる。塗工パターンは全
面、筋状、千鳥格子状などのいずれでもよい。前記ホッ
トメルト接着剤は空気中の水分で硬化するので、ホット
メルトタンク内は窒素や炭酸ガスなどの不活性ガスで置
換する必要がある。また、ホットメルトを塗工するガン
の付近はガスが発生するために局所排気をするなど換気
設備が必要となる。The method for applying the hot melt adhesive may be an ordinary method, such as curtain coating, spiral coating, shim coating, or bead coating. The coating pattern may be any of an entire surface, a streak shape, a houndstooth check shape, and the like. Since the hot melt adhesive is cured by moisture in the air, it is necessary to replace the inside of the hot melt tank with an inert gas such as nitrogen or carbon dioxide. In addition, ventilation is required in the vicinity of the gun for applying the hot melt, such as local exhaust, since gas is generated.
【００２１】本発明において基材に用いる不織布の原料
はポリプロピレン、ポリエチレン、ポリエステルなどの
熱可塑性繊維や、ポリエステル、ポリプロピレン、ポリ
エチレン、ナイロンなどの２成分以上からなる複合繊維
等や、レーヨン繊維、コットン繊維、パルプ繊維など単
独又は混合物を乾式又は湿式で不織布にしたものでも良
い。In the present invention, the raw material of the non-woven fabric used as the base material is a thermoplastic fiber such as polypropylene, polyethylene or polyester; a composite fiber comprising two or more components such as polyester, polypropylene, polyethylene or nylon; a rayon fiber or a cotton fiber. Or a non-woven fabric made of a single or a mixture of pulp fibers or the like by a dry or wet method.
【００２２】基材及び／又は表面材として用いる不織布
は、吸水性高分子の吸液による膨潤を妨げないように、
横伸びが大きい不織布を用いるのが好ましい。このよう
な不織布としては、熱収縮性繊維を用いて弾性収縮性を
付与した材料から作った不織布も使用できる。さらに伸
縮性を有するエラストマー不織ウェブ単体か、エラスト
マー不織ウェブの少なくとも片面にポリエステル繊維、
ポリオレフィン繊維、ナイロン繊維、コットン繊維、パ
ルプ繊維及びそれらの混合物を含むグループから選択さ
れた材料から作られた繊維層を水流交絡又は積層された
ウェブ等も用いることができる。The non-woven fabric used as the base material and / or the surface material should not impede the swelling of the water-absorbing polymer by liquid absorption.
It is preferable to use a nonwoven fabric having a large lateral elongation. As such a nonwoven fabric, a nonwoven fabric made of a material having elastic shrinkage by using heat shrinkable fibers can be used. Further, the elastomer nonwoven web alone having elasticity, or polyester fiber on at least one surface of the elastomer nonwoven web,
A web or the like in which a fiber layer made of a material selected from the group including polyolefin fiber, nylon fiber, cotton fiber, pulp fiber, and a mixture thereof may be used.
【００２３】基材及び表面材に用いられる不織布の製造
方法としては、いわゆるカード法、スパンボンド法、メ
ルトブローン法など乾式製法や抄紙機で製造する湿式製
法があげられるが、特に制限を受けるものではない。ま
た、これらのシートには全面あるいは一部に水流やニー
ドルによる開孔が施されていても良い。Examples of the method for producing the nonwoven fabric used for the base material and the surface material include a dry method such as a so-called card method, a spunbond method and a melt blown method, and a wet method using a paper machine. Absent. These sheets may be perforated with water flow or needles on the entire surface or a part thereof.
【００２４】基材としてはフィルム体を用いても良い。
フィルムの原料はポリプロピレン、ポリエチレン、ポリ
エステルなどの熱可塑性樹脂が好ましい。液不透過性で
水蒸気だけを透過させる公知の通気性フィルムを使用し
ても構わない。フィルムは通常の製法で得られたもので
よい。基材の裏面は粘着剤を塗布して粘着加工を施して
もよい。A film may be used as the substrate.
The film is preferably made of a thermoplastic resin such as polypropylene, polyethylene, or polyester. A known gas-permeable film that is liquid-impermeable and allows only water vapor to pass through may be used. The film may be obtained by a usual manufacturing method. The back surface of the base material may be subjected to an adhesive process by applying an adhesive.
【００２５】本発明において使用される表面材は、基材
に用いる不織布と同様のものから選択することができ
る。しかし、表面材には通液性が必要になるため、親水
化処理を施すことが好ましい。The surface material used in the present invention can be selected from those similar to the nonwoven fabric used for the substrate. However, since the surface material needs to have liquid permeability, it is preferable to perform a hydrophilic treatment.
【００２６】基材として用いる不織布やフィルムの坪量
は５〜２００ｇ／ｍ2 であることが好ましい。基材の坪
量が５ｇ／ｍ2 未満になると、基材に不織布を用いた場
合には、吸収性高分子を固定するために塗布したホット
メルト接着剤が基材の裏側に通り抜けてトラブルを生じ
やすくなり、また、基材にフィルムを用いた場合には作
業性が著しく悪くなり好ましくない。一方、基材の坪量
が２００ｇ／ｍ2 を越えると、不織布であってもフィル
ムであっても、吸水シートが厚くなり、薄くてしなやか
な特性が失われてしまう。また、表面材の坪量は５〜５
０ｇ／ｍ2 であることが好ましい。坪量が５ｇ／ｍ2 未
満になると、吸水後に少量ではあるが脱落する吸水性高
分子が表面材の目穴を通り抜けてしまうという不都合が
生じる。一方、５０ｇ／ｍ2 を越えると、吸水シートが
厚くて硬くなり、また、吸水性にも悪影響が現れるので
好ましくない。The basis weight of the nonwoven fabric or film used as the substrate is preferably from 5 to 200 g / m 2 . When the basis weight of the base material is less than 5 g / m 2 , when a non-woven fabric is used as the base material, the hot melt adhesive applied to fix the absorbent polymer passes through the back side of the base material, causing trouble. It is not preferable because a film is used as a base material, and workability is remarkably deteriorated. On the other hand, when the basis weight of the base material exceeds 200 g / m 2 , the water-absorbing sheet becomes thicker regardless of whether it is a non-woven fabric or a film, and thin and flexible properties are lost. The basis weight of the surface material is 5 to 5
It is preferably 0 g / m 2 . When the basis weight is less than 5 g / m 2 , there is a disadvantage that a small amount of the water-absorbing polymer that falls off after water absorption passes through the holes of the surface material. On the other hand, if it exceeds 50 g / m 2 , the water-absorbing sheet becomes thick and hard, and adversely affects water absorption, which is not preferable.
【００２７】基材及び表面材の接着は、超音波、高周
波、熱圧着によるヒートシールや熱エンボスロールによ
る溶融接着や、耐水性のホットメルト接着剤によって接
着することができる。接着する部位は吸水性高分子の付
着パターンを避けて、吸収シートの外周や、筋状、千鳥
格子状パターンにしてもよい。The base material and the surface material can be bonded by heat sealing using ultrasonic waves, high frequency waves, thermocompression bonding, fusion bonding using a hot embossing roll, or water-resistant hot melt adhesive. The portion to be adhered may be an outer periphery of the absorbent sheet, a streak pattern, or a staggered pattern, avoiding the adhesion pattern of the water absorbent polymer.
【００２８】吸水性高分子をホットメルト接着剤で基材
に固定するには、まず基材に反応型ホットメルト接着剤
を前記方法にて塗工し、その面上に吸水性高分子を散布
し、過剰にシート上に乗った吸水性高分子を振動、風力
などで除去すればよい。In order to fix the water-absorbing polymer to the substrate with a hot-melt adhesive, first, a reactive hot-melt adhesive is applied to the substrate by the method described above, and the water-absorbing polymer is sprayed on the surface. Then, the water-absorbing polymer excessively on the sheet may be removed by vibration, wind power, or the like.
【００２９】本発明の吸水シートは、パルプなど吸液速
度が早い吸収物品と重ねて使用しても良い。パルプとし
ては、化学パルプ、機械パルプもしくは古紙パルプのシ
ートを粉砕機で解繊することにより得られるものが使用
出来る。パルプ原料としては、針葉樹に限らず、広葉
樹、麻、わら、竹及びケナフ等の非木材パルプを用いる
こともできる。The water-absorbent sheet of the present invention may be used by overlapping with an absorbent article such as pulp having a high liquid absorption rate. As the pulp, those obtained by defibrating a sheet of chemical pulp, mechanical pulp or waste paper pulp with a crusher can be used. The pulp raw material is not limited to softwood, and non-wood pulp such as hardwood, hemp, straw, bamboo, and kenaf can also be used.
【００３０】前記構成を有する本発明の吸水シートは、
吸水性と形状保持性に優れたものである。また、本発明
の吸水シートは、基本構成としては表面にパルプを使用
していないために吸液後に濡れたままの状態が続くこと
はなく、菌の繁殖を招きにくい。したがって、衛生面に
優れ、食品用、医療用、ペット用品、家庭用品などに用
いることができる。The water-absorbent sheet of the present invention having the above-mentioned structure is
It is excellent in water absorption and shape retention. In addition, since the water-absorbent sheet of the present invention does not use pulp on the surface as a basic structure, the water-absorbent sheet does not remain wet after absorbing the liquid, and hardly causes propagation of bacteria. Therefore, it is excellent in hygiene and can be used for food, medical, pet supplies, household goods and the like.
【００３１】前記用途で考えられる例としては、食品用
としては食肉、鮮魚用トレイの下敷き、野菜輸送箱の下
敷きなど、医療用としては外傷手当て資材、汗取りパッ
ドなど、ペット用品としてはペット用カーペットなど、
家庭用品としては雨漏り受けシート、結露取りシート、
コースターなどの幅広い用途が考えられる。また、パル
プと共に使用すればおむつなどの衛材関連の用途に使用
することができる。特に吸水性高分子の含有量が多い薄
型おむつの吸収体としたり、部分的に吸収量を増やした
い位置に本発明の吸水シートを配置することが可能であ
る。Examples of the possible uses include meat, fresh fish tray underlays, vegetable transport underlays for food use, wound care materials and sweat pads for medical use, and carpets for pets as pet supplies. Such,
For household goods, rain leak receiving sheet, dew collecting sheet,
Wide applications such as coasters are conceivable. Also, if used with pulp, it can be used for applications related to sanitary materials such as diapers. In particular, it is possible to make a thin diaper absorbent having a large content of a water-absorbing polymer, or to dispose the water-absorbing sheet of the present invention at a position where it is desired to partially increase the absorption amount.
【００３２】[0032]
【実施例】以下に本発明の実施例にしたがって本発明を
詳細に説明するが、本発明はこれらの実施例に限定され
るものではない。EXAMPLES The present invention will be described in detail below with reference to examples of the present invention, but the present invention is not limited to these examples.
【００３３】実施例１ ポリプロピレンのスパンボンド２５ｇ／ｍ2 上に、カー
テン塗工にて結晶性ポリエステルポリオール系ウレタン
プレポリマーを主成分とする反応型ホットメルト接着剤
〔ニッタイトＡＲＸ−９００１（新田ゼラチン株式会社
製）、ＮＣＯ基２．６９重量％、粘度５０００ｍＰａ・
ｓ／１２０℃、軟化点６５℃〕を２０ｇ／ｍ2 塗工し、
その上にアクリル酸−アクリル酸ソーダ共重合体からな
る吸水性高分子〔アクアキープＳＡ−６０Ｓ（住友精化
製）、平均粒子径３００〜５００μｍ〕を散布した後、
振動を与えて過剰な吸水性高分子を取り除き、温度２５
℃で９６時間ホットメルト接着剤をキュアし、図１に示
す形状の吸水シートを得た。吸水性高分子の固定量は１
９０ｇ／ｍ2 であった。Example 1 A reactive hot melt adhesive containing a crystalline polyester polyol-based urethane prepolymer as a main component [Nittite ARX-9001 (Nitta Gelatin) was applied on a 25 g / m 2 polypropylene spun bond by curtain coating. Co., Ltd.), NCO group 2.69% by weight, viscosity 5000 mPa.
s / 120 ° C., softening point 65 ° C.] at 20 g / m 2 ,
After spraying a water-absorbing polymer (Aquakeep SA-60S (manufactured by Sumitomo Seika Chemical Co., Ltd., average particle size 300 to 500 μm)) made of an acrylic acid-sodium acrylate copolymer thereon,
Vibration is applied to remove excess water-absorbing polymer,
The hot melt adhesive was cured at 96 ° C. for 96 hours to obtain a water-absorbing sheet having the shape shown in FIG. The fixed amount of the water-absorbing polymer is 1
It was 90 g / m 2 .
【００３４】実施例２ 実施例１と同様にして吸水シートを得たが、ホットメル
ト接着剤のイソシアネート基末端のウレタンプレポリマ
ーは結晶性ポリエステルポリオール系及び非結晶性ポリ
エーテルポリオール系からなるウレタンプレポリマーを
主成分とする反応型ホットメルト接着剤〔ニッタイトＡ
ＲＸ−９００２（新田ゼラチン株式会社製）、ＮＣＯ基
３．１４重量％、粘度６５００ｍＰａ・ｓ／１２０℃、
軟化点６０℃〕を使用した。Example 2 A water-absorbent sheet was obtained in the same manner as in Example 1, except that the urethane prepolymer at the isocyanate group end of the hot melt adhesive was a urethane prepolymer comprising a crystalline polyester polyol system and an amorphous polyether polyol system. Reactive hot-melt adhesive containing polymer as a main component [Nittite A
RX-9002 (manufactured by Nitta Gelatin Co., Ltd.), NCO group 3.14% by weight, viscosity 6500 mPa · s / 120 ° C.,
Softening point 60 ° C].
【００３５】実施例３ 実施例１と同様にして吸水シートを得たが、ホットメル
ト接着剤のイソシアネート基末端のウレタンプレポリマ
ーは、結晶性ポリエステルポリオール系と非結晶性ポリ
エステルポリオール系のウレタンプレポリマーを主成分
とする反応型ホットメルト接着剤〔ニッタイトＡＲＸ−
９００３（新田ゼラチン株式会社製）、ＮＣＯ基３．２
５重量％、粘度４５００ｍＰａ・ｓ／１２０℃、軟化点
５５℃〕を使用した。Example 3 A water-absorbent sheet was obtained in the same manner as in Example 1, except that the urethane prepolymer of the isocyanate group end of the hot melt adhesive was a crystalline polyester polyol-based or non-crystalline polyester polyol-based urethane prepolymer. Hot-melt adhesive [NITITE ARX-
9003 (manufactured by Nitta Gelatin Co., Ltd.), NCO group 3.2
5 wt%, viscosity 4500 mPa · s / 120 ° C, softening point 55 ° C].
【００３６】実施例４ 厚さ３０μｍのポリエチレンフィルムを基材とした以外
は、実施例１と同様に吸水性高分子を固定した。さら
に、その上に親水化したポリプロピレンのスパンボンド
２５ｇ／ｍ2 を乗せて、周囲をヒートシールで熱融着さ
せ、図２に示す形状の吸水シートを得た。Example 4 A water-absorbing polymer was fixed in the same manner as in Example 1 except that a polyethylene film having a thickness of 30 μm was used as a base material. Further, 25 g / m 2 of a hydrophilized polypropylene spun bond was placed thereon, and the periphery was heat-sealed by heat sealing to obtain a water-absorbing sheet having the shape shown in FIG.
【００３７】実施例５ 基材をポリプロピレン７０％、レーヨン繊維３０％の配
合からなる横伸び不織布〔目付５０ｇ／ｍ2 、横方向引
張強度１３Ｎ／５０ｍｍ、破断伸び２２０％〕とした。
実施例１と同じホットメルト接着剤を幅２０ｍｍ、長さ
２００ｍｍ、ピッチ１０ｍｍの筋状塗工パターンになる
ようシム塗工した。さらに実施例１と同じ吸水性高分子
をホットメルト接着剤塗工面に散布し、余分な吸水性高
分子を振動で除いた後、ホットメルト接着剤をキュアし
て吸水シートを得た。さらに基材と同じ不織布を親水化
したものを表面シートとして上に重ね、周囲及びホット
メルト接着剤で吸水性高分子が固定されていない部分を
２ｍｍの幅でヒートシールし、図３に示す形状の吸水シ
ートを得た。吸水性高分子の固定量は固定された面積で
換算すると１８８ｇ／ｍ2 であった。Example 5 The base material was a laterally stretched nonwoven fabric (weight per unit area: 50 g / m 2 , tensile strength in the transverse direction: 13 N / 50 mm, elongation at break: 220%) composed of 70% polypropylene and 30% rayon fiber.
The same hot melt adhesive as in Example 1 was shim-coated so as to form a stripe-shaped coating pattern having a width of 20 mm, a length of 200 mm, and a pitch of 10 mm. Further, the same water-absorbing polymer as in Example 1 was sprayed on the surface coated with the hot-melt adhesive, and excess water-absorbing polymer was removed by vibration, and then the hot-melt adhesive was cured to obtain a water-absorbing sheet. Further, the same non-woven fabric as the base material was made hydrophilic and layered on top as a topsheet, and the periphery and the portion where the water-absorbing polymer was not fixed with the hot melt adhesive were heat-sealed with a width of 2 mm, and the shape shown in FIG. Was obtained. The fixed amount of the water-absorbing polymer was 188 g / m 2 in terms of the fixed area.
【００３８】比較例１ 実施例１と同様にして吸水シートを得たが、ホットメル
ト接着剤は、ＳＩＳをベースポリマーとするコンストラ
クション用、すなわちＰＥフィルムと不織布、あるいは
ティッシュの接着に適したＡＦＸ−９６８１〔ニッタフ
ィンドレイ株式会社製、粘度４０００ｍＰａ・ｓ／１６
０℃、軟化点８７℃〕を使用した。Comparative Example 1 A water-absorbent sheet was obtained in the same manner as in Example 1, except that the hot-melt adhesive was used for construction using SIS as a base polymer, that is, AFX- suitable for bonding a PE film to a nonwoven fabric or tissue. 9681 [manufactured by Nitta Findlay Co., Ltd., viscosity: 4000 mPa · s / 16
0 ° C, softening point 87 ° C].
【００３９】比較例２ 実施例１と同様にして吸水シートを得たが、ホットメル
ト接着剤は、ＳＩＳをベースポリマーとするコアー用、
すなわちティッシュとパルプ、あるいはティッシュ同
士、又はパルプ同士の接着に適し、水又は尿での湿潤時
においても良好な接着強度を示すホットメルト〔ＡＦＸ
−９６１８、ニッタフィンドレイ株式会社製、粘度１０
００ｍＰａ・ｓ／１６０℃、軟化点８２℃〕を使用し
た。Comparative Example 2 A water-absorbent sheet was obtained in the same manner as in Example 1, except that a hot-melt adhesive was used for a core having SIS as a base polymer.
That is, a hot melt [AFX] that is suitable for bonding tissue and pulp, or between tissues, or between pulp, and has good bonding strength even when wet with water or urine.
-9618, manufactured by Nitta Findlay Co., Ltd., viscosity 10
00 mPa · s / 160 ° C., softening point 82 ° C.].
【００４０】比較例３ 実施例１と同様にして吸水シートを得たが、ホットメル
ト接着剤は、ＳＢＳをベースポリマーとするコンストラ
クション用、すなわちＰＥフィルムと不織布、あるいは
ティッシュの接着に適したホットメルト〔ＡＦＸ−９０
２２、ニッタフィンドレイ株式会社製、粘度３５００ｍ
Ｐａ・ｓ／１６０℃、軟化点８７℃〕を使用した。Comparative Example 3 A water-absorbent sheet was obtained in the same manner as in Example 1, except that a hot-melt adhesive was used for construction using SBS as a base polymer, that is, a hot-melt adhesive suitable for bonding a PE film to a nonwoven fabric or tissue. [AFX-90
22, Nitta Findlay Co., Ltd., viscosity 3500m
Pa · s / 160 ° C., softening point 87 ° C.].
【００４１】実施例１〜３及び比較例１〜３で得られた
吸水シートについて吸水性高分子の吸水後の固定度合い
を下記に示す方法にて評価した。With respect to the water-absorbing sheets obtained in Examples 1 to 3 and Comparative Examples 1 to 3, the degree of fixation of the water-absorbing polymer after water absorption was evaluated by the following method.
【００４２】（吸水性高分子固定評価法）吸水シートを
５ｃｍ×１５ｃｍの短冊に切り、２５℃に温度調整した
人工尿（尿素０．２％、食塩１．２％、塩化カリ０．４
％、水９８．２％）にどぶ漬して、１５分経過して吸水
性高分子が十分に吸液し、ついで５分間水切りした後
に、短冊の片方の短辺を手で掴んで振ることによって、
吸液した吸水性高分子を脱落させた。脱落した吸水性高
分子を１０５℃に調整した熱風乾燥機に入れ、４時間放
置して乾燥させて重量を求めた。得られた吸水性高分子
の乾燥重量から人工尿の固形分を除して脱落した吸水性
高分子の重量Ａ（ｇ）を求めた。Ａ（ｇ）を元々短冊に
付着していた吸水性高分子の総量Ｂ（ｇ）で割り、１０
０分率で表して、脱落率Ｃ（％）を求めた。得られた脱
落率を表１に示す。表１から明らかなように、実施例１
〜３の本発明の吸水シートでは吸水性高分子の脱落率が
３０％前後であるのに対して、比較例１〜３の吸水シー
トでは吸水性高分子がすべて脱落しており、本発明の効
果が確認された。尚、実施例４〜５の吸水シートは袋状
に形成されており、吸水性高分子の脱落は認められなか
った。(Evaluation Method for Fixing Water-Absorbing Polymer) A water-absorbing sheet was cut into strips of 5 cm × 15 cm, and artificial urine (0.2% urea, 1.2% sodium chloride, 0.4% potassium chloride) was adjusted to 25 ° C.
%, Water 98.2%), and after 15 minutes, the water-absorbent polymer has sufficiently absorbed the liquid, and after draining for 5 minutes, grasp one short side of the strip by hand and shake. By
The absorbed water-absorbing polymer was dropped. The dropped water-absorbing polymer was placed in a hot-air dryer adjusted to 105 ° C., and left to dry for 4 hours to obtain a weight. The weight A (g) of the dropped water-absorbing polymer was obtained by removing the solid content of the artificial urine from the obtained dry weight of the water-absorbing polymer. A (g) was divided by the total amount of water-absorbing polymer B (g) originally attached to the strip, and 10
The dropout rate C (%) was calculated by expressing it as a 0-minute fraction. Table 1 shows the obtained shedding rates. As is clear from Table 1, Example 1
In the water-absorbent sheets of Comparative Examples 1 to 3, the water-absorbent sheets of Comparative Examples 1 to 3 had a shedding rate of about 30%, whereas in the water-absorbent sheets of Comparative Examples 1 to 3, all of the water-absorbent polymers had fallen off. The effect was confirmed. In addition, the water-absorbing sheets of Examples 4 and 5 were formed in a bag shape, and the water-absorbing polymer did not fall off.
【００４３】[0043]
【表１】 [Table 1]
【００４４】[0044]
【発明の効果】以上説明したように本発明の吸水シート
は、吸水性高分子の固定が確実であり、吸水後にも吸水
性高分子の脱落を防ぐことが可能となる。また、簡便な
方法で薄く、吸水性の高いシートが得られるので、さま
ざまな用途に用いることができる。As described above, in the water-absorbent sheet of the present invention, the water-absorbing polymer can be securely fixed, and the water-absorbing polymer can be prevented from falling off even after water absorption. Further, a thin and highly water-absorbing sheet can be obtained by a simple method, so that it can be used for various purposes.
【図１】基材が不織布である吸水シートの基本的な構造
を示す断面の模式図である。FIG. 1 is a schematic cross-sectional view showing a basic structure of a water-absorbent sheet whose base material is a nonwoven fabric.
【図２】基材がフィルムで、不織布表面材を有する吸水
シートの断面の模式図である。FIG. 2 is a schematic cross-sectional view of a water-absorbent sheet having a substrate as a film and a nonwoven fabric surface material.
【図３】基材及び表面材が不織布である吸水シートの断
面の模式図である。FIG. 3 is a schematic diagram of a cross section of a water-absorbing sheet in which a base material and a surface material are nonwoven fabrics.
１：吸水性高分子 ２：ホットメルト接着剤 ３：不織布基材 ４：親水性不織布表面材 ５：ヒートシール部 ６：ポリエチレンフィルム基材 ７：不織布基材 1: water-absorbing polymer 2: hot melt adhesive 3: non-woven fabric base material 4: hydrophilic non-woven fabric surface material 5: heat seal portion 6: polyethylene film base material 7: non-woven fabric base material
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０８Ｊ 5/12 (72)発明者 小木曽宏治 東京都江東区東雲１丁目10番６号 王子製 紙株式会社東雲研究センター内 (72)発明者 上野 精記 大阪府八尾市二俣２丁目22番地 新田ゼラ チン株式会社大阪工場内 (72)発明者 中村 和晃 大阪府八尾市二俣２丁目22番地 新田ゼラ チン株式会社大阪工場内 Ｆターム(参考） 3B029 BA01 BA18 4F071 AA01B AA04B AA20B AA32B AA53A AF10 AH19 CA01 CA03 CA07 CB01 CC02 CD01 4F100 AK01B AK07A AK07C AK25B AK51G BA02 BA03 BA07 BA10A BA10B BA10C CB02 CB03 DG15A DG15C GB23 GB66 GB71 GB90 JA13A JA13B JB05C JD15B JK06 YY00A YY00B 4G066 AC13C AC17B AC24D BA03 BA20 CA43 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C08J 5/12 (72) Inventor Koji Ogiso 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Inside the Shinonome Research Center (72) Inventor Seiki Ueno 2-22 Futama, Yao-shi, Osaka Nitta Gerachin Co., Ltd. Inside the Osaka Plant (72) Inventor Kazuaki Nakamura 2--22 Futama, Yao-shi, Osaka Nitta Gerachin F-term in Osaka Plant Co., Ltd. (reference) JD15B JK06 YY00A YY00B 4G066 AC13C AC17B AC24D BA03 BA20 CA43
Claims (2)
フィルムよりなる基材上に、主成分がイソシアネート基
末端ウレタンプレポリマーである反応型ホットメルト接
着剤が塗工され、その上にカルボキシル基を含む吸水性
高分子が３０〜４００ｇ／ｍ2 配置され、前記反応型ホ
ットメルト接着剤によって固定保持されていることを特
徴とする吸水シート。1. A reactive hot-melt adhesive whose main component is an isocyanate-terminated urethane prepolymer is coated on a substrate made of a nonwoven fabric or a film having a basis weight of 5 to 200 g / m 2 , and a carboxyl group is further coated thereon. A water-absorbent sheet comprising 30 to 400 g / m 2 of a water-absorbent polymer containing the same and fixedly held by the reactive hot melt adhesive.
フィルムよりなる基材上に主成分がイソシアネート基末
端ウレタンプレポリマーである反応型ホットメルト接着
剤が塗工され、その上にカルボキシル基を含む吸水性高
分子が３０〜４００ｇ／ｍ2 配置され、前記反応型ホッ
トメルト接着剤によって固定保持されており、さらに前
記吸水性高分子の上面に親水性の不織布からなる表面材
が配置され、前記基材と前記表面材の相対する部分が接
着されていることを特徴とする吸水シート。 2. A reactive hot-melt adhesive whose main component is an isocyanate-terminated urethane prepolymer is coated on a base material made of a nonwoven fabric or a film having a basis weight of 5 to 200 g / m 2 , and a carboxyl group is formed thereon. The water-absorbing polymer containing 30 to 400 g / m 2 is arranged and fixed and held by the reactive hot melt adhesive, and a surface material made of a hydrophilic nonwoven fabric is arranged on the upper surface of the water-absorbing polymer, A water-absorbing sheet, wherein opposing portions of the base material and the surface material are adhered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34244699A JP2001158074A (en) | 1999-12-01 | 1999-12-01 | Water absorption sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34244699A JP2001158074A (en) | 1999-12-01 | 1999-12-01 | Water absorption sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001158074A true JP2001158074A (en) | 2001-06-12 |
Family
ID=18353812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34244699A Pending JP2001158074A (en) | 1999-12-01 | 1999-12-01 | Water absorption sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001158074A (en) |
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