JP2858660B2 - Absorbent article comprising a liquid retentive structure and liquid retention structure - Google Patents

Absorbent article comprising a liquid retentive structure and liquid retention structure

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JP2858660B2
JP2858660B2 JP1061244A JP6124489A JP2858660B2 JP 2858660 B2 JP2858660 B2 JP 2858660B2 JP 1061244 A JP1061244 A JP 1061244A JP 6124489 A JP6124489 A JP 6124489A JP 2858660 B2 JP2858660 B2 JP 2858660B2
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liquid
structure
foam
absorbent article
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隆俊 小林
善平 明和
美次 濱島
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花王株式会社
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【発明の詳細な説明】 〔産業上の利用分野〕 本発明は液保持性構造体及び該構造体を具備する生理用ナプキン、紙オムツ、失禁パッドで代表される吸収性物品に関するものであり、詳しくは、圧下における保液性に優れた液保持性構造体及び該構造体を具備する吸収性物品に関するものである。 DETAILED DESCRIPTION OF THE INVENTION The present invention [relates] are those sanitary napkins having a liquid retention structure and the structure, paper diapers, absorbent article represented by the incontinence pad, More particularly, the present invention relates to an absorbent article having a liquid retention excellent liquid retention structure and the structure in the pressure.

〔従来の技術及び発明が解決しようとする課題〕 [Challenge BACKGROUND OF INVENTION Problems to be Solved]

パルプは、経済的で柔軟性を有し、且つ高い親水性を有するので、これを積繊したものが生理用ナプキンや紙おむつ等の吸収体として広く使用されてきている。 Pulp has an economic and flexible, and has high hydrophilicity, which it was fiber stacking has been widely used as an absorber, such as sanitary napkins and disposable diapers. しかし、パルプの積繊体による吸収及び液の保持は親水性毛細管の物理的性質によるものであり、従って圧縮、曲げ等の力が加わった時、容易に変形を起こし、保持していた液が容易に放出されてしまうといった欠点を有している。 However, retention of the absorbent and liquid by pulp stacks is due to the physical properties of the hydrophilic capillary, thus compressed, when the bending force or the like is applied, readily undergo deformation, retained liquid is has a disadvantage would be easily released. また、該積繊体は乾燥時においては、ある程度の圧縮及び曲げ回復性を示すが、吸水時には著しく低下し、 Further, laminate 繊体 in when dry, but shows a certain degree of compression and bending recovery, significantly decreased during water absorption,
全く回復性を示さないといった欠点を有している。 Has a drawback at all do not exhibit recovery.

これにより、股部に装着される実使用において、吸収体のヨレ、ヘタリが生じ、その結果、モレが発生する主原因となっている。 Thus, in actual use to be attached to the crotch portion, twist of the absorber, permanent set occurs, as a result, has become a major cause of leakage occurs. 従って、上記の欠点を補うため次の(1),(2)に示すような技術が開示されている。 Therefore, the next to compensate for the above drawbacks (1), discloses a technique as shown in (2).

(1) 第3図に示す如く、液透過性表面材1、液不透過性バックシート2、親水性繊維を主体とする吸収体3 (1) As shown in Figure 3, liquid-permeable surface material 1, a liquid impermeable backsheet 2, the absorbent body 3 made mainly of hydrophilic fibers
から構成される生理用ナプキンの吸収体中もしくは非使用面側に保形性を有する弾性多孔体4(発泡フォーム等)を設置せしめる事により吸収体の変形を防いだもの(実公昭56−6099号公報)。 Which prevented the deformation of the absorber By allowed to set up an elastic porous body 4 having a shape retention (expanded foam, etc.) in the absorbent body or non-use surface side of the sanitary napkin comprised of (Utility Model 56-6099 JP).

(2) 第4図に示す如く、弾性多孔体4の気泡(セル)中に親水性繊維及び/又は吸水ポリマー5を均一に分散させたもの(特開昭56−97448号公報)。 (2) As shown in FIG. 4, the hydrophilic fibers and / or the water-absorbing polymer 5 which were uniformly dispersed (JP 56-97448 JP) into bubble of the elastic porous body 4 (cell).

しかし、(1)の場合には構成体全体として保型性は保たれるが、用いられる弾性多孔体4は、親水性が不十分であったり、液の吸収保持に有効な骨格構造を有していないため、弾性多孔体4自身は液保持性を実質的に有しない。 However, (1) but shape retention is maintained as a whole structure in the case, the elastic porous body 4 used, chromatic or a is insufficient hydrophilicity, effective skeletal structure absorbing and retaining the liquid since then not, the elastic porous body 4 itself substantially no liquid retention. 従って、変形が与えられると、親水性繊維を主体とする吸収体3自身の回復性はない為に、結果として吸収体3自身はヨレ、ヘタリを生じてしまい、効果が不十分である。 Therefore, when the deformation is given, in order not absorber 3 itself recovery mainly comprising hydrophilic fibers, the absorbent body 3 itself the resulting twisted, would occur a permanent set, the effect is insufficient.

(2)の場合は、吸液性、保液性の若干の向上は認められるものの、やはり弾性多孔体4自身の液保持性が劣悪であり、親水性繊維及び吸水ポリマーの吸液、保液性能が気泡径により制限を受けるため、依然として吸収性物品としては、その性能は不十分であった。 For (2), the liquid absorbing, although a slight increase in liquid retention is observed, is also poor the liquid retention of the elastic porous body 4 itself, the hydrophilic fiber and the water-absorbing polymer liquid absorption, liquid retaining since performance limited by bubble diameter, as is still the absorbent article, its performance was inadequate.

〔課題を解決するための手段〕 [Means for Solving the Problems]

そこで、本発明者等は、上述の如き従来技術の欠点を解決すべく、鋭意研究の結果、材質及び構成のいかんにかかわらず、特定の骨格構造を有する親水性多孔体を使用する事により、変形回復性に極めて優れ、かつ十分な液吸収保持性を有する液保持性構造体が得られる事を見い出し本発明を完成した。 The present inventors have to solve the drawbacks of the above such as the prior art, the results of extensive studies, regardless of the material and configuration, by using a hydrophilic porous material having a specific skeleton structure, very good deformation recovery properties, and a liquid retentive structure body having a sufficient liquid absorbing and retaining properties and completed the present invention found that the resulting.

即ち、本発明は、ポリウレタン発泡体からなる3次元的な骨格構造を有し、該骨格の少なくとも表面が親水性であり、該発泡体の平均気泡径が50〜700μmである液保持性構造体、及び該液保持性構造体を具備することを特徴とする吸収性物品を提供するものである。 That is, the present invention has a three-dimensional framework structure composed of polyurethane foam, at least the surface hydrophilicity of the backbone, the liquid retention structure an average cell size of the foam is 50~700μm , and is intended to provide an absorbent article which is characterized by comprising a liquid retentive structure.

本発明を更に詳しく説明すると、本発明の液保持性構造体は、ポリウレタン発泡体からなる3次元的な骨格構造を有し、発泡体の平均気泡径が50〜700μmである構造体であり、特に特願昭63−294315号明細書に記載されている製造方法によって得られるエチレンオキサイド残基含有量(ポリウレタンの構成単位であるポリエーテルポリオールにおいて、該ポリエーテルポリオール中の全アルキレンオキサイドに占めるエチレンオキサイド含有量)が20重量%以上である吸水性ポリウレタン系発泡体が、好ましい親水性、骨格構造、圧縮特性などを比較的容易に付与することができることから好ましい。 When describing the present invention in more detail, the liquid retention structure of the present invention has a three-dimensional framework structure composed of polyurethane foam, the average cell diameter of the foam is a structure which is 50-700 .mu.m, especially in the polyether polyol is a structural unit of ethylene oxide residues content (polyurethane obtained by the production method described in Japanese Patent Application Sho 63-294315 Pat ethylene in the total alkylene oxide in the polyether polyol absorbent polyurethane foam oxide content) is 20 wt% or more, preferably hydrophilic, skeletal structure, preferably because it can be and compression characteristics relatively easily applied.

本発明において、発泡体の平均気泡径(測定法は実施例参照)が50〜700μmの構造体を用いることにより、 In the present invention, by the average cell diameter of the foam (see assay embodiment) used structures 50-700 .mu.m,
極めて吸液性と保液性に優れた液保持性構造体が得られるが、平均気泡径が50μm未満になると、吸液速度が実用上不十分であり、逆に700μmを超える構造体では、 Although very absorbent and liquid retaining excellent liquid retention structure is obtained, the average cell diameter is less than 50 [mu] m, is insufficient liquid absorption speed is practically the structures of more than 700μm Conversely,
保液性が不十分なものとなるため、本発明の意図するところではない。 Since the liquid retaining property becomes insufficient, not the intent of the present invention.

本発明のポリウレタン発泡体の気泡膜の形状は連続気泡中に、独立気泡が混存していても良いが、より高い吸収性能を得るには、連続気泡が好ましく、更には連続気泡フォームの中でも、気泡膜の開孔率(測定法は実施例参照)が40%以上のものが特に望ましい。 The shape of open cells foam film of the polyurethane foam of the present invention, although closed cells may also be 混存, to obtain a higher absorption capacity is preferably open cell, even more in the open-cell foam , the rate of hole area of ​​the bubble film (measuring method see example) is particularly preferable not less than 40%.

尚、気泡膜とは骨格から延出して存在する薄膜を意味し、その組成は骨格と実質的に同一である。 Note that the bubble film means a film which is present extending from the backbone, the composition is substantially the same as skeletal. 隣接する気泡がこの気泡膜より互いに遮断されているものを独立気泡と称する。 Those adjacent bubbles are blocked from each other than the bubble membrane is referred to as closed cell. これに対して、気泡膜が開孔、即ち連続孔を有し、隣接する気泡が互いに遮断されていないものを連続気泡と称する。 In contrast, a bubble film apertures, i.e. interconnected pores, referred to as open cell those adjacent bubbles is not interrupted each other.

一方、発泡体の平均気泡(セル)径は、前述の如く骨格間の距離に相当するので50〜700μmであることが必要である。 On the other hand, average bubble (cell) diameter of the foam, it is necessary that 50~700μm so corresponds to the distance between as described above skeleton.

また、吸収速度を考慮すると、気泡間を連結する連通孔の平均孔径(測定法は実施例参照)は20〜200μmであることが好ましく、60〜100μmであればより好ましい。 In consideration of absorption rate, (see examples assay) average pore diameter of the communicating hole for connecting the bubble is preferably from 20 to 200 [mu] m, and more preferably it is 60-100.

また、本発明の構造体の弾性としては、50%変形時の圧縮応力(測定法は実施例参照)が10〜200g/cm 2であることが好ましい。 Further, as the elasticity of the structure of the present invention, it is preferred that (the measurement method see example) 50% compressive stress during deformation is 10 to 200 g / cm 2.

本発明の構造体は、骨格の少なくとも表面がある程度の親水性を有することが必要であり、骨格を構成する素材が疎水性材料の場合には、適当な湿潤剤で処理し、表面の親水性を向上させて使用するのが好ましいが、構成素材自体がある程度の親水性を有していれば、湿潤剤処理の必要がなく、工程が簡略化されるのでより好ましい。 Structure of the present invention, it is necessary that at least the surface of the skeleton has a certain degree of hydrophilicity, when the material constituting the skeleton of the hydrophobic material, treated with a suitable wetting agent, a surface of the hydrophilic it is preferred to use to improve, if construction material itself has a certain hydrophilic, there is no need for wetting agent treatment, more preferable because the process is simplified. この親水性は粉末法による親水度(測定法は実施例参照)として数値化されるが、この親水度は0.3以上であることが好ましい。 This hydrophilicity hydrophilicity by powder method (measurement method see example) is digitized as, the hydrophilicity is preferably 0.3 or more.

以上の如き本発明に係る液保持性構造体は吸収性部材として吸水性が要求される各種用途に使用することができる。 Liquid retentive structure body according to the present invention as described above can be used in various applications where water resistance is required as an absorbent member. 特に生理用ナプキン、紙オムツ、失禁パッド等の吸収性物品の吸収性部材として用いると非常に有効である。 In particular sanitary napkins, paper diapers, it is very effective to use as an absorbent member of an absorbent article of the incontinence pad or the like.

本発明の液保持性構造体を具備する吸収性物品の構成は特に限定されず、液透過性の表面材、液不透過性のバックシート、及びこれらの間に位置し本発明の液保持性構造体を有する吸収体から実質的になる。 Construction of an absorbent article comprising a liquid retentive structure of the present invention is not particularly limited, liquid-permeable surface material, a liquid impermeable backsheet, and a liquid retention position to the invention between these consisting essentially of the absorber having the structure. 吸収体は本発明の液保持性構造体単独から構成されていても十分な効果が得られるが、粉砕パルプや他の吸収部材、例えば吸収紙、吸収ポリマー等と複合しても良い。 Absorber is a liquid retentive structure alone sufficiently be composed of effects of the present invention is obtained, ground pulp or other absorbent members, such as absorbent paper, it may be combined with absorbent polymer.

また本発明の吸収性物品に用いられる液透過性表面材、液不透過性バックシートとしては特に限定されず、 The absorbent article to the liquid-permeable surface material for use in the present invention is not particularly restricted but includes a liquid-impermeable backsheet,
従来公知の吸収性物品に用いられているものが使用できる。 Those used in conventional absorbent articles can be used.

本発明の液保持性構造体を具備する吸収性物品は吸水性、保液性が極めて良く、また弾性を有しているため、 Absorbent article comprising a liquid retentive structure of the present invention water-absorbing, for liquid retention has a very good, also elastic,
圧下及び長時間の使用においても極めて吸収性が良好である。 Very absorbent is good also in pressure and long-term use.

〔実施例〕 〔Example〕

以下、製造例及び実施例により本発明を更に詳細に説明するが、本発明はこれらの実施例に限定されるものではない。 Hereinafter, a more detailed explanation of the present invention by the production examples and examples, the present invention is not limited to these examples.

尚、例中の部及び%は特記しない限り重量基準である。 Incidentally, parts and% in examples are by weight unless otherwise indicated.

製造例1 ポリオールとして分子量8350でエチレンオキサイド(EO)含有率80%のエチレンオキサイド(EO)−プロピレンオキサイド(PO)ブロックポリマー(プルロニック Production Example 1 Polyol as molecular weight 8350 with ethylene oxide (EO) content of 80% ethylene oxide (EO) - propylene oxide (PO) block polymers (Pluronic
F68,旭電化工業(株))50部と分子量2000のポリエチレングリコール(PEG)50部、架橋剤としてジエタノールアミン2部、触媒としてテトラメチルヘキサメチレンジアミン(カオライザーNo.1,花王(株))0.7部、水3 F68, Asahi Denka Co.) 50 parts of polyethylene glycol having a molecular weight 2000 (PEG) 50 parts of diethanolamine 2 parts as a crosslinking agent, tetramethyl hexamethylene diamine as a catalyst (Kaoraiza No.1, Kao Corporation) 0.7 parts , water 3
部、整泡剤としてSH−200(シリコーン整泡剤,東レシリコーン(株))1部、活性剤としてラウリルアルコールEO6モル付加体のメチルキャップ化物1部とソルビタン脂肪酸エステルEO付加物1部を加え、15秒間高速撹拌した。 Parts, SH-200 as the foam stabilizer (a silicone foam stabilizer, Toray Silicone Co.) 1 part of a methyl capped product 1 parts of sorbitan fatty acid esters EO adduct 1 part of lauryl alcohol EO6 mole adduct as an active agent was added , and high-speed stirring for 15 seconds. しかるのち、有機ポリイソシアネート(TDI,住友バイエルウレタン(株)製スミジュールT−80)を添加し、撹拌混合すると、数分で発泡ゲル化した。 After accordingly, by adding an organic polyisocyanate (TDI, Sumitomo Bayer Urethane Co. Sumidur T-80), and stirred mixture was foamed gelled in a few minutes. ゲル化後 After gelling
50℃の保温機内に20分間放置し、反応を完結し、平均気泡径385μmでEO含有率90%のポリエーテル系ポリウレタンフォーム(液保持性構造体1)を得た。 Was left warmth cabin 50 ° C. 20 min, the reaction was complete to give an average cell diameter EO content of 90% polyether-based polyurethane foam with 385μm (liquid retentive structure 1).

更に、EO−POブロックポリマーの種類や、PEGとの配合比等を変え、同様の操作でそれぞれ平均気泡径350μ Furthermore, the type of EO-PO block polymer or changing the mixing ratio or the like with PEG, average each in the same manner bubble diameter 350μ
m,280μmで、EO含有率60%,80%のポリエーテル系ポリウレタンフォーム(液保持性構造体2,3)を得た。 m, at 280 .mu.m, was obtained EO content of 60%, 80% of polyether-based polyurethane foam (liquid retentive structure 2,3).

また、比較品として、水分量等の製造条件を変え、それぞれ平均気泡径40μmと800μmのEO含有率80%のポリエーテルポリウレタンフォーム(液保持性構造体8, Further, as a comparative product, changing the manufacturing conditions of the water content, etc., each the average cell diameter 40 [mu] m 80% and 800 [mu] m EO content of the polyether polyurethane foams (liquid retentive structure body 8,
9)を得た。 9) was obtained.

製造例2 ポリオールとして、アジピン酸とエチレンオキサイド(EO)−プロピレンオキサイド(PO)ブロックポリマー(プルロニックL31,平均分子量1100,旭電化工業(株))から合成したポリエステル系のポリオールを用いて平均気泡径340μmの連続気泡エステル系ポリウレタンフォームを得た。 Production Example 2 Polyol, adipic acid with ethylene oxide (EO) - propylene oxide (PO) block polymers average cell diameter using a polyol polyester which is synthesized from (Pluronic L31, average molecular weight 1100, manufactured by Asahi Denka Co.) to obtain an open cell ester-based polyurethane foam of 340μm. このフォームを、湿潤剤としてペレックスOTP(ジアルキルスルホコハク酸ナトリウム, This form, Pelex OTP (sodium dialkyl sulfosuccinate as a wetting agent,
花王(株))を用いて親水処理し、発泡体全体に湿潤剤を3重量%付着させて親水性ポリウレタンフォーム(液保持性構造体4)を得た。 And hydrophilic treatment using Kao Corporation), was 3 wt% deposited was a wetting agent throughout the foam to give a hydrophilic polyurethane foam (liquid retentive structure 4).

また、上記湿潤剤処理前のエステル系ポリウレタンフォームを酸素とプロパンとの混合気体中に置き、着火し、その爆風によりポリウレタンフォーム中の気泡と気泡との間に残存する薄膜部分(気泡膜)を完全に取り除いた平均気泡径437μm,300μm,243μmのポリウレタンフォームを得、上記と同様に湿潤剤処理し、親水性ポリウレタンフォームを得た(液保持性構造体5,6,7)。 Also, placing the ester polyurethane foam before the wetting agent treatment in a mixed gas of oxygen and propane, ignited, thin film portions remaining between the bubbles and the bubbles in the polyurethane foam by its blast a (bubble film) the resulting average cell diameter 437μm completely removed were, 300 [mu] m, the polyurethane foam 243Myuemu, similarly to the above processes a wetting agent to obtain a hydrophilic polyurethane foam (liquid retentive structure 5,6,7).

又、比較品としてそれぞれ平均気泡径820μm,1750μ Further, each of the comparative product average cell diameter 820μm, 1750μ
mのエステル系ポリウレタンフォームを得、上記と同様に湿潤剤処理し、親水性ポリウレタンフォームを得た(液保持性構造体10,11)。 Give the ester polyurethane foam m, similarly to the above processes a wetting agent to obtain a hydrophilic polyurethane foam (liquid retentive structure 10, 11).

実施例1〜7及び比較例1〜5 上記で得られた本発明の液保持性構造体1〜7(実施例1〜7)及び比較の液保持性構造体8〜11(比較例1 Examples 1 to 7 and Comparative Examples 1 to 5 liquid retention structure of the present invention obtained in the above 1 to 7 (Examples 1 to 7) and comparative liquid retentive structure 8-11 (Comparative Example 1
〜4)について平均気泡径、気泡膜開孔率、平均連通孔径、50%圧縮応力、密度、親水度を下記方法により測定し、一連の測定結果を表1に示した。 The average cell diameter for to 4), the bubble membrane porosity, average communicating pore size, 50% compressive stress, density, hydrophilicity was measured by the following methods, indicated a series of measurement results are shown in Table 1.

更に比較品として密度0.06g/cm 3の綿状粉砕パルプ(液保持性構造体12,比較例5)についても上記と同様に物性を評価した。 Also physical properties were evaluated in the same manner as described above for further density 0.06 g / cm 3 fluffy fluff pulp as comparative product (liquid retentive structure 12, Comparative Example 5). その結果も表1に示す。 The results are also shown in Table 1.

(1) 平均気泡径、気泡膜開孔率及び平均連通孔径の測定 試験サンプルを電子顕微鏡で写真撮影の後、画像解析装置(日本アビオニクス社製Avio EXCEL)を用いて、各気泡面積を求め、その面積に相当する円相当直径を気泡径とした。 (1) average cell diameter, after a measurement test sample of bubble film porosity and average communicating pore size of photographed with an electron microscope, using an image analyzer (Nippon Avionics Co. Avio EXCEL), obtains the respective bubble area, the equivalent circle diameter corresponding to the area was cell diameter. 200個の平均値をとて平均気泡径とした。 It was defined as the average bubble diameter 200 of the average value.

気泡膜開孔率αは下記の(1)式により求めた。 Bubble membrane porosity α was determined by the following equation (1).

N 0 :各気泡間を連結する連通孔の数 N 1 :各気泡間を連結する気泡膜が開孔しないで残っている数 (N 0 +N 1 =200のデータをもって気泡膜開孔率とした。) 平均連通孔径においても同様に、各気泡間を連結する孔面積を求め、その面積に相当する円相当直径を孔径とした。 N 0: Number N 1 of the communicating hole for connecting the respective bubbles: the bubbles film aperture ratio with the data of the number (N 0 + N 1 = 200 bubbles film for connecting the respective air bubbles remain without opening .) Similarly, in the average communication pore size, determine the open area for connecting the respective bubbles, and a pore size of a circle equivalent diameter corresponding to the area. 気泡膜が開孔していない孔は孔径0として計算し、200個の平均値を平均連通孔径とした。 Hole bubble film is not opening is calculated as pore size 0, it was defined as an average communicating pore size of 200 of the mean.

(2) 50%圧縮応力の測定 100mm×50mm、厚み5mmのサンプルをテンシロン圧縮試験機で、圧縮速度10mm/min、圧縮面積10cm 2で圧縮する。 (2) Measurement 100 mm × 50 mm in 50% compression stress, the sample thickness 5mm at Tensilon compression tester, compression speed 10 mm / min, is compressed in the compression area 10 cm 2. サンプルが初期厚みの50%(2.5mm)に達した時の単位面積当たりの圧縮応力を、50%圧縮応力(g/cm 2 Sample 50% of the initial thickness of the compressive stress per unit area when reached (2.5 mm), 50% compressive stress (g / cm 2)
として求めた。 It was determined as.

(3) 親水度の測定 第5図に示す装置を用いて親水度を測定する。 (3) measuring the hydrophilicity by use of the apparatus shown in measurement Figure 5 of hydrophilicity.

初めに測定液9として、エタノール(EtOH)を用いて次の操作を行う。 As the test solution 9 initially, do the following with ethanol (EtOH).

測定台7とビューレット6中のエタノールの側口の液面を等高位にセットし(等圧になる様)、測定台7中の直径80mmのガラスフィルター8(No.1)上に、試験片10 Set the measuring table 7 and biurets liquid surface of the side opening of ethanol in 6 equal high (equal which become pressure), on the glass filter 8 having a diameter of 80mm in the measurement table 7 (No.1) Test piece 10
(50mm厚、40mm×40mmの直方体)を乗せ、直ちに荷重11 Put (50mm thickness, rectangular 40 mm × 40 mm), immediately load 11
(重さ80g、荷重圧5g/cm 2 )を乗せ、60分間放置する(この時、試験片がエタノールを吸収した量だけビュレットの側口より空気が入り、側口の液面は等位に保たれる)。 (Weight 80 g, load pressure 5 g / cm 2) placing the, left for 60 minutes (at this time, the test piece air enters from the side port only burette amount of absorbed ethanol, the liquid surface of the side opening in the equipotential kept is). この間に試験片が吸収したエタノールの吸収量を求めた。 During this time the test piece was determined absorption amount of ethanol absorbed.

次に測定液9を生理食塩水に変え、上記と同様の手法で生理食塩水の吸収量を求め、以下の式により生理食塩水と試験片との親水度cosθ(θ:生理食塩水と試験片との接触角)を計算した。 Then changing the measurement liquid 9 in physiological saline to obtain the absorption of saline at the same above method, hydrophilicity cos [theta] (theta between the saline specimen by the following formula: Test saline It was calculated contact angle) between the pieces.

尚、この親水度cosθの測定は、粉末法とも称されている。 The measurement of the hydrophilicity of cosθ is also referred to as powder method.

本発明品である液保持性構造体1〜7、及び比較品である液保持性構造8〜12の吸液性、吸収力、圧下における保液性等の効果を確認する為、吸収時間、吸収量、圧下保持量、吸収力の評価を下記の方法で行った。 Liquid retentive structure 1-7 products of the present invention, and the absorbent liquid retention structure 8-12 is a comparative product, absorbency, to confirm the effect of the liquid retention and the like in pressure, absorption time, absorption, pressure holding amount, were evaluated for absorption force in the following manner.

結果を表2に示した。 The results are shown in Table 2.

A.吸収時間 第6図に示すように、乾燥した10mm×10mm×5mmの試験片13を水平に置き、直径10mmの注入口14のついたアクリル板15をのせる。 A. As shown in FIG. 6 absorption time, place the test piece 13 of the dry 10 mm × 10 mm × 5 mm horizontally placed an acrylic plate 15 with a injection port 14 with a diameter of 10 mm. 試験片13に5g/cm 2の荷重がかかる様に更に重り16をのせる(アクリル板と重りの重量の和を The specimen 13 put more weight 16 as load is applied to 5 g / cm 2 (the sum of the weight of the acrylic plate and the weight
500gとする)。 And 500g). 注入口14から馬血(脱繊維、(株)日本バイオテスト研究所)10gを注入し、液が完全に吸収されるまでの時間を吸収時間(秒)とする。 From the injection port 14 horse blood (defibrinated, Nippon Biotest Laboratories) and injected 10 g, the time until the liquid is completely absorbed absorption time (seconds).

B.吸収量 乾燥した試験片を50mm×50mm×10mmにカットした後、 After cutting the B. absorption dry specimen 50mm × 50mm × 10mm,
300ml入りのビーカーに入れる。 Placed in a beaker of 300ml filled. 次いで、Aで用いた馬血200mlを加え、試験片が浮かない様、金網で強制的に浸漬し、30分間放置した。 Then added horse blood 200ml used in A, such that specimens from floating, forcibly immersed in a wire mesh, and allowed to stand for 30 minutes. その後、80meshの金網上に5 Then, 5 on the wire mesh of 80mesh
時間放置して水を切り、試験片の重量を測定した。 Time left to cut water were weighed specimen. 以下に示す式により、吸収量を求めた。 The formula shown below, were determined absorption.

吸収量(g)=W 1 −W 0 W 0 :乾燥時の試験片重量(g) W 1 :吸収後の試験片重量(g) C.圧下保持量 吸収量評価に用いた吸収後の試験片を台の上に置き、 Absorption (g) = W 1 -W 0 W 0: Dry time of the test piece weight (g) W 1: test after absorption using the test piece weight (g) C. reduction retention of absorption evaluation after absorption Place the pieces on a table,
その上に1250gの重り(単位面積当たり50g/cm 2の荷重) Weight of 1250g thereon (load per unit area 50 g / cm 2)
を載せ、3分間放置する。 It was loaded and left to stand for 3 minutes. その後、重りを取り除き試験片の重量を測定した。 Was then weighed specimens removed weight. 以下に示す式により吸収量を求め、圧下保持量とした。 Determine the absorption by the formula shown below, it was pressure holding amount.

圧下保持量(g)=W 2 −W 0 W 2 :50g/cm 2荷重圧縮後の試験片重量(g) W 0 :Bで求めた乾燥時の試験片重量(g) D.吸収力 第5図に示す装置を用いて、吸収力を測定する。 Reduction retention amount (g) = W 2 -W 0 W 2: 50g / cm 2 specimen weight after load compression (g) W 0: The test piece weight (g) D. absorbency after drying obtained in B 5 using the apparatus shown in FIG, measuring the absorption force. 測定台7とビューレット6中の生理食塩水9の側口の液面を等高位にセットし(等圧になる様)、測定台7中の直径 Set the measuring table 7 and the liquid surface of the side ports saline 9 in burette 6 to equal high (which become isobaric), the diameter in the measuring stand 7
80mmのガラスフィルター8(No.1)上に試験片10(10mm Test piece 10 on 80mm glass filter 8 (No.1) (10mm
厚、50mm×50mmの直方体)を乗せ、直ちに荷重11(125 Thick, 50 mm × 50 mm placed a rectangular parallelepiped) of the immediately load 11 (125
g、5g/cm 2荷重)を乗せ、10分間放置する(この時、試験片10が生理食塩水を吸収した量だけビューレット6の側口より空気が入り、側口の液面は等位に保たれる)。 g, 5 g / cm 2 load) carrying, left for 10 minutes (this time, air enters from the side port only biuret 6 amounts specimen 10 is absorbed saline, the liquid surface of the side port equipotential kept is) in.
この間に試験片10が吸収した生理食塩水の吸収量を吸収力とした。 The absorption of saline test piece 10 is absorbed during this time was absorbed power.

吸収力(ml/10min)=10分後に生理食塩水を吸収した量 Amount of absorbed absorbency (ml / 10min) = 10 minutes after saline 表2に示す結果より、平均気泡径が50〜700μmと極めて最適に設計された発泡体においては、いずれも綿状粉砕パルプ(比較例5)よりも吸液時間が短く、かつ弾性を有している為に圧下における保液性が優れている。 From the results shown in Table 2, in the average cell diameter it is very optimally designed with 50~700μm foam, both short liquid-absorbing time than fluffy pulverized pulp (Comparative Example 5), and an elastic liquid retention in pressure for that is excellent.

比較品において、平均気泡径が50μm未満となると、 In comparative, the average cell diameter is less than 50 [mu] m,
吸収時間が遅く、実用不十分であり、平均気泡径が700 Slow absorption time, is a practical insufficient, the average bubble diameter is 700
μmを超えると、逆に吸収量、吸収力が不十分なものとなる。 Beyond [mu] m, absorption conversely, becomes absorbency is insufficient.

実施例8〜14及び比較例6〜10 本発明品である液保持特性構造体1〜7、及び比較品である液保持特性構造体8〜12を用い、第1図に示す如き吸収性物品を製造した。 Using the liquid retention characteristics structures 8-12 are examples 8 to 14 a liquid retention property structure 1-7 is and Comparative Examples 6-10 present invention products and the comparative products, the absorbent article as shown in Figure 1 It was prepared.

即ち、液保持性構造体21を170mm×70mm、厚み5mmに切り出し、その下面及び側面を液不透過性バックシート(ポリエチレンラミネート紙)22で覆い、更に全面を液透過性の表面材(ポリオレフィン系乾式不織布)23で覆った。 That, 170 mm × 70 mm a liquid retentive structure body 21, cut out in the thickness 5 mm, the lower and side surfaces of the liquid-impermeable backsheet (polyethylene laminated paper) covered with 22, further liquid-permeable surface material on the entire surface (polyolefin covered with a dry non-woven fabric) 23.

得られた吸収性物品の効果を確認する為、以下に示す方法で動的最大吸収量の測定を行った。 To confirm the effect of the resulting absorbent article was measured dynamic maximum absorption in the following manner.

結果を表3に示す。 The results are shown in Table 3.

(1) 動的最大吸収量の測定 第7図に示す如く、可動式女性腰部モデル17に第8図の様に試験サンプル19を装着させ、ショーツをはかせた後、歩行運動させながら、滴下用チューブポンプ18により疑似血液を注入し、横モレを生じるまでに吸収した量を測定した。 (1) As shown in the measurement Figure 7 dynamic maximum absorption, a test sample 19 is mounted as in FIG. 8 to movable female waist model 17, after tomb shorts, while walking motion, a dropping injecting pseudo blood by a tube pump 18, to determine the amount absorbed by causing lateral leakage. サンプルは10点について測定し、その平均値を動的最大吸収量とした。 Samples were measured for 10 points, and the average was taken as the dynamic maximum absorption.

表3に示す結果より、本発明品は最適な平均気泡径を有しているので、吸液性、保液性が極めて良く、かつ弾性回復力を有するので股間の動きにより変形を受けてもヨレ、ヘタリが生じないので、有効に横モレを防止できる事がわかる。 From the results shown in Table 3, since the present invention product has an optimal average bubble diameter, absorbent, liquid retention is very good, and even if subjected to deformation by the movement of the crotch because it has an elastic recovery force twist, because fatigue does not occur, it is understood that it is possible to prevent the effective lateral leakage.

実施例15〜17及び比較例11〜13 本発明品である液保持性構造体3,5,7及び比較品である液保持性構造体8,10,12を用い、第2図に示す如き吸収性物品を製造した。 Using a liquid retentive structure 8,10,12 a liquid retentive structure 3, 5, 7 and Comparative Product is Examples 15 to 17 and Comparative Examples 11 to 13 present inventions, as shown in Figure 2 an absorbent article was produced.

即ち、液保存性構造体21(170mm×70mm×5mm)の下に、2枚の吸収紙24(坪量30g/m 2 ,170mm×70mm×5mm) That is, under the liquid storage structure body 21 (170mm × 70mm × 5mm) , two absorbent paper 24 (basis weight of 30g / m 2, 170mm × 70mm × 5mm)
の間に高吸水ポリマー25(ポリアクリル酸架橋物)0.3g Superabsorbent polymers 25 (polyacrylic acid crosslinked product) 0.3 g during the
を散布した吸収シートを設置し、これらを液不透過性バックシート(ポリエチレンラミネート紙)22で覆い、更に全面を液透過性の表面材(ポリオレフィン系乾式不織布)23で覆った。 Established the absorbing sheet were dispersed, they were covered with a liquid-impermeable backsheet (polyethylene laminated paper) 22, further covered entirely liquid-permeable surface material in (a polyolefin dry nonwoven fabric) 23.

得られた吸収性物品の効果を確認する為、上記実施例と同様に動的最大吸収量を測定した。 To confirm the effect of the resulting absorbent article was measured dynamic maximum absorption in the same manner as the above embodiment.

結果を表4に示す。 The results are shown in Table 4.

表4に示す結果より、本発明品は、吸収紙や吸収ポリマー等、他の吸収素材と複合すると更に高い横モレ防止効果を示した。 From the results shown in Table 4, the product of the present invention, absorbent paper or absorbent polymers exhibited a higher transverse leakage preventing effect when combined with other absorbent material.

〔発明の効果〕 〔Effect of the invention〕

以上に示すとおり、本発明の液保持性構造体は、最適な平均気泡径を有しているので、極めて吸液性、保液性に優れ、かつ弾性を有している為に圧下における保液性も高い。 As shown above, the liquid retention structure of the present invention has a optimal average bubble diameter, coercive in pressure in order to have very absorbent, good liquid retention, and an elastic humoral also high. 従って、本発明の液保持性構造体を単独で用いても、他の吸収部材と複合しても、生理用ナプキンや紙オムツ等の吸収体として用いた場合には、極めて漏れの少ない吸収性物品を提供する事が可能となった。 Therefore, even by using the liquid retention structure of the present invention alone or in combination with other absorbent members, when used as an absorber, such as sanitary napkins or paper diapers, less extremely leak absorbent It has become possible to provide an article.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

第1図は本発明の吸収性物品の一実施例を示す断面図、 Sectional view showing an embodiment of an absorbent article of Figure 1 according to the present invention,
第2図は本発明の吸収性物品の別の実施例を示す断面図、第3図及び第4図はそれぞれ従来の吸収性物品の断面図、第5図は親水度及び吸収力測定に用いた装置の断面図、第6図は吸収時間の測定に用いた装置の断面図、 Sectional view showing another embodiment of the absorbent article of FIG. 2 the present invention, cross-sectional view of FIGS. 3 and 4 are conventional absorbent article, respectively, use Figure 5 is the hydrophilicity and absorbency measurement sectional view of the stomach device, cross-sectional view of the apparatus Figure 6 is used for the measurement of the absorption time,
第7図は動的最大吸収量の測定に用いた女性腰部モデルの斜視図、第8図は女性腰部モデルに試験サンプルを装着させた状態を示す斜視図である。 Figure 7 is a perspective view of a female waist model used to measure the dynamic maximum absorption, FIG. 8 is a perspective view showing a state of being fitted with a test sample to female waist model. 1:液透過性表面材 2:液不透過性バックシート 3:親水性繊維を主体とする吸収体 4:弾性多孔体 5:親水性繊維及び/又は吸水ポリマー 6:ビューレット 7:測定台 8:ガラスフィルター 9:測定液体 10:試験片 11:荷重 12:ゴム栓 13:試験片 14:注入口 15:アクリル板 16:重り 17:女性腰部モデル 18:チューブポンプ 19:試験サンプル 21:液保持性構造体 22:液不透過性バックシート 23:液透過性表面材 24:吸収紙 25:高吸水ポリマー 1: liquid-permeable surface material 2: liquid-impermeable back sheet 3: absorber composed mainly of hydrophilic fibers 4: an elastic porous body 5: hydrophilic fiber and / or water-absorbing polymeric 6: biuret 7: measurement base 8 : glass filter 9: measurement liquid 10: test piece 11: load 12: rubber stopper 13: test piece 14: inlet 15: acrylic plate 16: weight 17: female waist model 18: tube pump 19: test sample 21: liquid retaining sex structure 22: liquid-impervious backsheet 23: liquid-permeable surface material 24: absorbent paper 25: superabsorbent polymer

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−275118(JP,A) 特開 昭62−227354(JP,A) 特開 昭54−15997(JP,A) 特開 平1−108216(JP,A) 特開 平2−140216(JP,A) 特公 昭63−22824(JP,B2) (58)調査した分野(Int.Cl. 6 ,DB名) A61F 13/15 ────────────────────────────────────────────────── ─── of the front page continued (56) reference Patent Sho 62-275118 (JP, a) JP Akira 62-227354 (JP, a) JP Akira 54-15997 (JP, a) JP flat 1- 108216 (JP, a) JP flat 2-140216 (JP, a) Tokuoyake Akira 63-22824 (JP, B2) (58 ) investigated the field (Int.Cl. 6, DB name) A61F 13/15

Claims (7)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】ポリウレタン発泡体からなる3次元的な骨格構造を有し、該骨格の少なくとも表面が親水性であり、該発泡体の平均気泡径が50〜700μmであることを特徴とする液保持性構造体。 1. A has a three-dimensional framework structure composed of polyurethane foam, at least the surface hydrophilicity of the backbone, the liquid an average cell diameter of the foam is characterized in that it is a 50~700μm retention structure.
  2. 【請求項2】発泡体の気泡膜開孔率が40%以上である請求項1記載の液保持性構造体。 2. A foam liquid retentive structure body according to claim 1, wherein the bubble film porosity is 40% or more of.
  3. 【請求項3】発泡体の各気泡間を連結する平均連通孔径が20〜200μmである請求項1又は2記載の液保持性構造体。 3. A foam according to claim 1 or 2, wherein the liquid retentive structure mean communicating pore diameter for connecting the respective bubbles is 20~200μm of.
  4. 【請求項4】骨格の親水度が0.30以上である請求項1〜 4. The method of claim 1 hydrophilicity of the backbone is at least 0.30
    3のいずれかに記載の液保持性構造体。 Liquid retention structure according to any one of 3.
  5. 【請求項5】50%変形時の圧縮応力が10〜200g/cm 2である請求項1〜4のいずれかに記載の液保持性構造体。 5. The liquid retention structure according to any one of claims 1 to 4 compressive stress at 50% deformation is 10 to 200 g / cm 2.
  6. 【請求項6】ポリウレタンの構成単位であるポリエーテルポリオールにおいて、該ポリエーテルポリオール中の全アルキレンオキサイドに占めるエチレンオキサイド含有量が20重量%以上である請求項1〜5のいずれかに記載の液保持性構造体。 6. The polyether polyol is a structural unit of the polyurethane, the liquid according to any one of claims 1 to 5 ethylene oxide content to the total alkylene oxide in the polyether polyol is 20 wt% or more retention structure.
  7. 【請求項7】請求項1〜6のいずれかに記載の液保持性構造体を具備することを特徴とする吸収性物品。 7. The absorbent article characterized by comprising a liquid retentive structure body according to any one of claims 1 to 6.
JP1061244A 1989-03-14 1989-03-14 Absorbent article comprising a liquid retentive structure and liquid retention structure Expired - Fee Related JP2858660B2 (en)

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AR000655A1 (en) * 1995-01-10 1997-07-10 Procter & Gamble A polymeric foam material which is capable of absorbing blood and fluids based blood cloth catamenia comprising an absorbent member made from the foam material one artículoabsorbente comprising said foam material and a process for preparing said material l foam
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US5770634A (en) * 1995-06-07 1998-06-23 The Procter & Gamble Company Foam materials for insulation, derived from high internal phase emulsions
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JP2015029790A (en) * 2013-08-05 2015-02-16 花王株式会社 The absorbent article
CN108348379A (en) * 2015-11-04 2018-07-31 宝洁公司 Thin and flexible absorbent articles
BR112018009109A2 (en) * 2015-11-04 2018-11-06 Procter & Gamble thin and flexible absorbent articles
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