JPH05228172A - Absorptive article - Google Patents
Absorptive articleInfo
- Publication number
- JPH05228172A JPH05228172A JP4031916A JP3191692A JPH05228172A JP H05228172 A JPH05228172 A JP H05228172A JP 4031916 A JP4031916 A JP 4031916A JP 3191692 A JP3191692 A JP 3191692A JP H05228172 A JPH05228172 A JP H05228172A
- Authority
- JP
- Japan
- Prior art keywords
- adhesive
- absorbent article
- sensitive adhesive
- pressure
- tackiness
- 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.)
- Granted
Links
Landscapes
- Absorbent Articles And Supports Therefor (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、使い捨ておむつ等の吸
収性物品、詳しくは、粘着剤が低タック性であるため
に、使用時に不織布表面のベタつき感がなく、また粘着
剤の組成成分である軟化剤等がしみだす、いわゆる“裏
抜け現象”が生じる程度が少ない吸収性物品に関する。FIELD OF THE INVENTION The present invention relates to absorbent articles such as disposable diapers, and more specifically, because the tackiness of the adhesive is low, there is no sticky feeling on the surface of the non-woven fabric at the time of use, and the composition is a component of the adhesive. The present invention relates to an absorbent article in which a so-called "strikethrough phenomenon", which is exuded by a certain softening agent or the like, is small.
【０００２】[0002]
【従来の技術】一般の使い捨ておむつは、肌に接する不
織布と透湿性シートとの間に吸収体を介在させて、それ
らの所定部位を粘着剤により接着固定して構成されてい
る。そして、上記粘着剤としては、接着しにくい部材を
接着させるために、広い温度範囲（０〜６０℃）でタッ
ク性があり、それによって粘着剤を塗工してから、部材
を接着させるまでの時間（オープンタイムという）に関
係なく接着可能な粘着剤が用いられている。2. Description of the Related Art A general disposable diaper is constructed by interposing an absorbent between a non-woven fabric that comes into contact with the skin and a moisture permeable sheet, and adhering and fixing predetermined portions of these with an adhesive. The adhesive has tackiness in a wide temperature range (0 to 60 ° C.) for adhering a member that is difficult to adhere, and thus, from applying the adhesive to adhering the member. Adhesives that can adhere regardless of time (called open time) are used.
【０００３】また、上記粘着剤としては、タック性を発
現させ且つ塗工適性を向上させるために、ベースエラス
トマーの割合を減らす一方、粘着付与剤及び軟化剤の割
合を増やした低粘度タイプのゴム系粘着剤が主流になっ
ており、生産性などを考え、ゴム系のホットメルト粘着
剤が主流である。通常、上記ゴム系粘着剤は、ベースの
ゴム（スチレン系ブロックポリマー）の分子量が大きく
（７０，０００〜１００，０００）、溶融粘度を下げる
ために、軟化剤成分の割合を大きくしている。As the pressure-sensitive adhesive, a low-viscosity type rubber in which the proportion of the base elastomer is reduced and the proportions of the tackifier and the softening agent are increased in order to develop tackiness and improve coating suitability. Rubber-based hot-melt adhesives are the mainstream in consideration of productivity and the like. Usually, in the rubber-based pressure-sensitive adhesive, the base rubber (styrene-based block polymer) has a large molecular weight (70,000 to 100,000), and the proportion of the softening agent component is increased in order to reduce the melt viscosity.
【０００４】また、上記透湿性シートとしては、おむつ
の使用時のむれ等を防止するために、通常、多孔性ポリ
オレフィンよりなる透湿シートが用いられている。As the moisture-permeable sheet, a moisture-permeable sheet made of a porous polyolefin is usually used in order to prevent the diaper from becoming loose during use.
【０００５】[0005]
【発明が解決しようとする課題】通常の吸収性物品に用
いられている、広い温度範囲でタック性のある上記粘着
剤は、不織布などの表面の粗い材料を接着するには適し
ているが、その塗工量が多い場合やその塗工部に高い圧
力がかかった場合には、不織布を通してしみだし、べた
つき感がでてくるという欠点がある。このため、タック
性を低減した粘着剤の使用が考えられる。The above-mentioned pressure-sensitive adhesive that is used in ordinary absorbent articles and has tackiness over a wide temperature range is suitable for adhering a material having a rough surface such as a nonwoven fabric. When the amount of coating is large or when a high pressure is applied to the coated portion, there is a drawback that it exudes through the nonwoven fabric and gives a sticky feeling. Therefore, it is conceivable to use an adhesive having reduced tackiness.
【０００６】しかしながら、上記ゴム系粘着剤において
は、そのタック性を低減させることには限度がある。タ
ック性を低減させると、上記ゴム系粘着剤を溶融させて
塗工した場合、溶融状態から固体状態になるまでの時間
が短いために、基材を接着させるまでに固体状態になっ
てしまい、その時点でタック性が小さいと不織布等の接
触面積の小さい基材への接着力が発現せず、吸収性物品
に使用するには不都合が生じる。However, the above-mentioned rubber-based pressure-sensitive adhesive has a limit in reducing its tackiness. When the tackiness is reduced, when the rubber-based pressure-sensitive adhesive is melted and applied, since the time from the molten state to the solid state is short, the substrate is in the solid state before being bonded, If the tackiness is small at that time, the adhesive force to a base material having a small contact area such as a non-woven fabric is not developed, and it is inconvenient for use in an absorbent article.
【０００７】また、広い範囲でタック性が発現し易いゴ
ム系粘着剤は、粘着付与剤及び軟化剤の割合が多くベー
スエラストマーの割合が少ないために、軟化剤等が粘着
剤中に保持され難く、熱などの影響を受けると、透湿シ
ートの表面にしみだす、いわゆる”裏抜け現象”が生じ
る。この裏抜け現象が生じると、透湿シートの表面にべ
たつき感が生じたり、おむつの諸物性に悪影響が現れた
り、パック保存時におむつ同志のブロッキングが生じた
り、粘着剤組成の変化により接着物性が経時変化したり
する等種々の不都合が生じる。Further, in the rubber-based pressure-sensitive adhesive which easily exhibits tackiness in a wide range, the ratio of the tackifier and the softening agent is large and the ratio of the base elastomer is small, so that the softening agent and the like are hard to be retained in the pressure-sensitive adhesive. When exposed to heat, a so-called "strikethrough phenomenon" occurs, which causes the moisture permeable sheet to seep out to the surface. When this strike-through phenomenon occurs, the surface of the moisture-permeable sheet may become sticky, various physical properties of the diaper may be adversely affected, blocking of diapers may occur during storage of the pack, and adhesive properties may change due to changes in the adhesive composition. Various inconveniences such as changes with time occur.
【０００８】従って、本発明の目的は、吸収性物品の製
造時には、基材への接着性が良好であり、その使用時に
は、低タック性でべたつき感が無いにも拘わらず基材と
の接着性が良好であって且つ粘着剤中の組成成分である
軟化剤等のしみだし成分が透湿シートの表面にしみだ
す”裏抜け現象”がほとんどない吸収性物品を提供する
ことにある。Therefore, an object of the present invention is to have good adhesiveness to a base material during the production of an absorbent article, and at the time of its use, adhere to a base material despite its low tackiness and no sticky feeling. It is an object of the present invention to provide an absorbent article which has good property and has almost no "strikethrough phenomenon" in which a oozing component such as a softening agent which is a composition component in the pressure-sensitive adhesive oozes on the surface of the moisture-permeable sheet.
【０００９】[0009]
【課題を解決するための手段】本発明者等は、鋭意検討
した結果、特定の粘着剤を用いることにより、上記目的
を達成し得ることを知見した。本発明は、上記知見に基
づきなされたもので、液透過性の表面シート、液不透過
性の裏面シート及びこれら両シート間に介在する吸収体
とを有し、粘着剤により一体化された吸収性物品におい
て、上記粘着剤が、アモルファスポリαオレフィン及び
粘着付与剤樹脂を含有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。Means for Solving the Problems As a result of intensive studies, the present inventors have found that the above object can be achieved by using a specific adhesive. The present invention has been made based on the above findings, and has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between these two sheets, and is integrated by an adhesive. In the present invention, there is provided an absorbent article, wherein the pressure-sensitive adhesive contains an amorphous poly-α-olefin and a tackifier resin.
【００１０】以下、本発明の吸収性物品について詳述す
る。本発明の吸収性物品は、液透過性の表面シート、液
不透過性の裏面シート及びこれら両シート間に介在する
吸収体とを有し、粘着剤により一体化されてなるもので
ある。The absorbent article of the present invention will be described in detail below. The absorbent article of the present invention has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed between these sheets, and is integrated with an adhesive.
【００１１】本発明の吸収性物品に用いられる上記粘着
剤としては、アモルファスポリαオレフィン（以下、Ａ
ＰＡＯと略す）及び粘着付与剤樹脂を含有し、且つ必要
に応じ軟化剤を含有するＡＰＡＯベース粘着剤が用いら
れる。As the above-mentioned pressure-sensitive adhesive used in the absorbent article of the present invention, amorphous poly-α-olefin (hereinafter, referred to as A
(Abbreviated as PAO) and a tackifier resin, and optionally an APAO base pressure-sensitive adhesive containing a softening agent is used.
【００１２】上記ＡＰＡＯとしては、例えば、分子量が
１，０００〜２０，０００のプロピレン・エチレン共重
合体及びプロピレン・エチレン・ブテン−１共重合体等
が好ましいものとして挙げられる。Preferred examples of APAO include propylene / ethylene copolymers having a molecular weight of 1,000 to 20,000 and propylene / ethylene / butene-1 copolymers.
【００１３】また、上記粘着付与剤樹脂としては、軟化
点が８０℃以上で、分子量が４００〜２，０００である
Ｃ5 系石油樹脂、Ｃ9 系石油樹脂、Ｃ5 ／Ｃ9 系石油樹
脂；αピネン、βピネン又はジペンテンの重合体である
ポリテルペン樹脂；ロジン系樹脂、ＤＣＰＤ（ジシクロ
ペンタジエン）系石油樹脂、及びこれらの水添物等が好
ましいものとして挙げられる。The tackifier resin may be a C 5 petroleum resin, a C 9 petroleum resin, a C 5 / C 9 petroleum resin having a softening point of 80 ° C. or higher and a molecular weight of 400 to 2,000. Polyterpene resin, which is a polymer of α-pinene, β-pinene, or dipentene; rosin resin, DCPD (dicyclopentadiene) petroleum resin, and hydrogenated products thereof are preferable.
【００１４】また、上記軟化剤としては、軟化点が１０
℃以下で、平均分子量が２００〜７００のプロセスオイ
ル、各種可塑剤、ポリブテン及び液状樹脂等が好ましい
ものとして挙げられる。The softening agent has a softening point of 10
Process oils having an average molecular weight of 200 to 700 at a temperature of not higher than 0 ° C., various plasticizers, polybutene, liquid resins and the like are preferable.
【００１５】上記ＡＰＡＯベース粘着剤の好ましい組成
としては、ＡＰＡＯ１００重量部に対し、上記粘着付与
剤樹脂５０〜２００重量部（更に好ましくは７０〜１５
０重量部）、上記軟化剤１〜５０重量部（更に好ましく
は１〜３０重量部）である。上記粘着付与剤樹脂の含有
量が５０重量部未満であると、基材を接着する温度にお
ける流動性が小さくなり、不織布などの接触面積の小さ
いものの接着力が小さくなる。また、粘着付与剤樹脂が
２００重量部超であると、又は上記軟化剤の配合量が５
０重量部超であると、吸収性物品の使用温度範囲でタッ
ク性が発現し、ベタツキ感が大きくなると共に、透湿シ
ートの裏抜け現象が大きくなるおそれがある。上記ＡＰ
ＡＯベース粘着剤のコーティング方法としては、ビー
ド、スパイラル、スロット、グラビアコーティング等が
可能であるが、耐熱性の小さい透湿シートへの塗工を考
慮すると、ビード及びスパイラルコーティングが好まし
い。上記ＡＰＡＯ粘着剤の塗工量としては、ビード状の
場合３０〜１００ｍｇ／ｍが好ましい。粘着剤の塗工量
が３０ｍｇ／ｍ未満であると、吸収性物品を固定するの
に必要な接着力が得られ難い。粘着剤の塗工量が１００
ｍｇ／ｍ超であると、表面材からのにじみ出しが生じ、
製品製造時のブロッキングや装着時のベタツキ感が生じ
るおそれがある。The preferred composition of the APAO base adhesive is 50 to 200 parts by weight (more preferably 70 to 15 parts) of the tackifier resin per 100 parts by weight of APAO.
0 parts by weight), and 1 to 50 parts by weight (more preferably 1 to 30 parts by weight) of the softening agent. When the content of the tackifier resin is less than 50 parts by weight, the fluidity at the temperature for adhering the base material becomes small, and the adhesive force of the non-woven fabric having a small contact area becomes small. Further, when the tackifier resin is more than 200 parts by weight, or the compounding amount of the above softener is 5
When it is more than 0 parts by weight, tackiness is exhibited in the operating temperature range of the absorbent article, the stickiness is increased, and the strike-through phenomenon of the moisture-permeable sheet may be increased. AP above
Beads, spirals, slots, gravure coating, and the like can be used as the coating method of the AO-based pressure-sensitive adhesive, but in consideration of coating on a moisture-permeable sheet having low heat resistance, beads and spiral coating are preferable. The coating amount of the APAO adhesive is preferably 30 to 100 mg / m in the case of a bead shape. When the coating amount of the pressure-sensitive adhesive is less than 30 mg / m, it is difficult to obtain the adhesive force required to fix the absorbent article. Adhesive coating amount is 100
When it is more than mg / m, oozing from the surface material occurs,
There is a risk of blocking during product manufacturing and stickiness during mounting.
【００１６】上記ＡＰＡＯベース粘着剤には、上記ＡＰ
ＡＯ、上記粘着付与剤樹脂、及び上記軟化剤の他に、更
に酸化防止剤を添加することが好ましい。The APAO-based pressure-sensitive adhesive contains the above-mentioned AP.
In addition to AO, the tackifier resin, and the softening agent, it is preferable to add an antioxidant.
【００１７】上記酸化防止剤としては、例えば、イルガ
ノックス１０１０、イルガノックス１０７６〔チバガイ
ギ（株）製〕、スミライザーＧＭ〔住友化学（株）〕等
が挙げられる。上記酸化防止剤の添加量は、ＡＰＡＯ１
００重量部に対して、好ましくは１〜３重量部である。Examples of the above-mentioned antioxidants include Irganox 1010, Irganox 1076 (manufactured by Ciba-Gaigi Co., Ltd.), Sumilizer GM (Sumitomo Chemical Co., Ltd.) and the like. The addition amount of the above antioxidant is APAO1
It is preferably 1 to 3 parts by weight with respect to 00 parts by weight.
【００１８】本発明の吸収性物品に用いられる上記ＡＰ
ＡＯベース粘着剤は、溶融状態から固化するまでの時間
が長く、基材を接着する温度範囲で流動性を維持し、基
材へのアンカー効果により、タック性と共に接着力発現
に寄与することができる。The AP used in the absorbent article of the present invention
The AO-based pressure-sensitive adhesive has a long time from the molten state to the solidification, maintains fluidity in the temperature range for adhering the base material, and contributes to tackiness and adhesive force expression due to the anchor effect to the base material. it can.
【００１９】上記ＡＰＡＯベース粘着剤を用いて一体化
された本発明の吸収性物品の使用時における上記粘着剤
のべたつき感を無くすためには、吸収性物品の使用温度
範囲である０〜４０℃において上記粘着剤のタック性の
発現を少なくすればよく、このため、０〜４０℃におけ
る上記ＡＰＡＯベース粘着剤の弾性率が、１０7 〜１０
8 Ｐａであることが好ましい。また、基材の接着時にタ
ック性を発現させるために、基材を接着する温度範囲で
ある４０〜６０℃における上記ＡＰＡＯベース粘着剤の
弾性率が、１０5 〜１０7 Ｐａであることが好ましい。In order to eliminate the sticky feeling of the adhesive when using the absorbent article of the present invention integrated with the APAO base adhesive, the temperature range of the absorbent article is 0 to 40 ° C. In this case, the tackiness of the pressure-sensitive adhesive may be reduced. Therefore, the elastic modulus of the APAO-based pressure-sensitive adhesive at 0 to 40 ° C. is 10 7 to 10 7.
It is preferably 8 Pa. In order to develop tackiness when adhering the base material, the elastic modulus of the APAO base pressure-sensitive adhesive in the temperature range of 40 to 60 ° C. for adhering the base material is preferably 10 5 to 10 7 Pa. ..
【００２０】０〜４０℃における上記ＡＰＡＯベース粘
着剤の弾性率が、１０8 Ｐａ超であると、吸収性物品の
風合いが悪くなるおそれがあり、また、１０7 Ｐａ未満
であると、タック性が発現し、ベタツキ感やブロッキン
グの原因となるおそれがある。If the elastic modulus of the APAO base pressure-sensitive adhesive at 0 to 40 ° C. is higher than 10 8 Pa, the texture of the absorbent article may be deteriorated, and if it is lower than 10 7 Pa, the tackiness is low. May occur, which may cause stickiness or blocking.
【００２１】更に、０〜４０℃における上記ＡＰＡＯベ
ース粘着剤の弾性率が、上記範囲外であると、基材を接
着する温度範囲である４０〜６０℃において、タック性
の発現する弾性率範囲である１０5 〜１０7 Ｐａの弾性
率範囲に入らなくなり、接着力が低下するおそれがあ
る。Further, when the elastic modulus of the APAO-based pressure-sensitive adhesive at 0 to 40 ° C. is out of the above range, the elastic modulus range in which tackiness is exhibited at 40 to 60 ° C. which is the temperature range for adhering the base material. That is, the elastic modulus may not fall within the elastic modulus range of 10 5 to 10 7 Pa and the adhesive strength may be reduced.
【００２２】基材を接着する温度範囲における４０〜６
０℃において、上記ＡＰＡＯベース粘着剤の弾性率が１
０5 Ｐａ未満であると、粘着剤の凝集力が発現せず、接
着力が低下すると共に、吸収性物品の使用温度範囲でも
タック性が発現してしまうおそれがあり、また、１０7
Ｐａ超であると、タック性が発現しにくいために接着力
が低下するおそれがある。40 to 6 in the temperature range for bonding the substrate
At 0 ° C., the elastic modulus of the APAO base adhesive is 1
0 is less than 5 Pa, without cohesive force of the pressure-sensitive adhesive is expressed, the adhesive strength is lowered, there is a risk that tackiness will also expressed at the use temperature range of the absorbent article, also 10 7
If it exceeds Pa, the tackiness is unlikely to be exhibited, and the adhesive strength may be reduced.
【００２３】また、上記ＡＰＡＯベース粘着剤の溶融状
態から固化までの時間を長くするため、粘着剤の動的粘
弾性曲線から求められた損失正接（ｔａｎδという）ピ
ーク温度が０〜４０℃の間にあることが好ましい。Further, in order to prolong the time from the molten state to the solidification of the APAO-based pressure-sensitive adhesive, the loss tangent (tan δ) peak temperature obtained from the dynamic viscoelastic curve of the pressure-sensitive adhesive is between 0 and 40 ° C. Is preferred.
【００２４】上記ｔａｎδピーク温度が４０℃超である
と、基材を接着する温度範囲で流動性が低下し、接着力
が低下するおそれがある。また、上記ｔａｎδピーク温
度が０℃未満であると、基材を接着する温度範囲におけ
る流動性は保たれるが、吸収性物品の使用温度範囲にお
いて、タック性が発現してしまうおそれがあり、また、
低分子量成分が増えるために、これら低分子成分が透湿
シートの表面にしみだす”裏抜け現象”が増加するおそ
れもある。If the tan δ peak temperature is higher than 40 ° C., the fluidity may be lowered in the temperature range for adhering the base material, and the adhesive strength may be lowered. Further, if the tan δ peak temperature is less than 0 ° C, fluidity is maintained in the temperature range for adhering the base material, but tackiness may develop in the operating temperature range of the absorbent article, Also,
Since the amount of low molecular weight components increases, there is a possibility that the “strikethrough phenomenon” that these low molecular weight components exude to the surface of the moisture-permeable sheet may increase.
【００２５】尚、上記”裏抜け現象”は、透湿シートに
粘着剤を塗布したとき、粘着剤中の軟化剤等のしみだし
成分が透湿シートの表面を濡らして裏抜けした（しみだ
した）ようになる現象であり、曇りガラスを水で濡らす
と、光が透過し、曇りガラスを介して外側が見えるよう
になる現象と同じである。The above-mentioned "strikethrough phenomenon" means that when a pressure-sensitive adhesive is applied to a moisture-permeable sheet, a bleeding component such as a softening agent in the pressure-sensitive adhesive wets the surface of the moisture-permeable sheet to cause strikethrough. When the frosted glass is wet with water, the light is transmitted and the outside can be seen through the frosted glass.
【００２６】本発明者らは、このような現象を利用して
上記”裏抜け現象”を定量化することを試みた。The present inventors have attempted to quantify the above-mentioned "strikethrough phenomenon" by utilizing such a phenomenon.
【００２７】即ち、〔図１〕に示すように、透湿シート
の裏面に粘着剤を塗布したサンプル３の該裏面側に、黒
色プレート４を配置し、上記サンプル３の表面側に、透
明ガラス板５を配置し、上記サンプル３の表面側（上記
透明ガラス板５側）から波長４５９ｎｍの青色入射光を
照射する一方、上記サンプル３からの反射光の反射率を
測定することにより、裏抜けの程度（しみだしの程度）
の定量化を試みた。この方法によれば、裏抜けの程度が
大きいと（しみだしの程度が大きいと）、青色入射光が
サンプル３を透過して黒色プレート４に至り、該黒色プ
レート４に吸収されて、上記サンプル３からの反射光の
反射率が低下し、また、裏抜けの程度が小さいと（しみ
だしの程度が小さいと）、青色入射光がサンプル３を透
過して黒色プレート４に至ることが少なく、該黒色プレ
ート４に吸収されずにサンプル３で反射し、上記サンプ
ル３からの反射光の反射率が高くなる。That is, as shown in FIG. 1, a black plate 4 is arranged on the back side of the sample 3 having a back surface of a moisture-permeable sheet coated with an adhesive, and a transparent glass is placed on the front side of the sample 3. By arranging the plate 5 and irradiating blue incident light with a wavelength of 459 nm from the surface side (the transparent glass plate 5 side) of the sample 3, while measuring the reflectance of the reflected light from the sample 3 Degree (degree of exudation)
We tried to quantify According to this method, when the amount of strike-through is large (the amount of seepage is large), the blue incident light passes through the sample 3 to reach the black plate 4, and is absorbed by the black plate 4, so that the sample When the reflectance of the reflected light from 3 decreases and the degree of strike-through is small (the degree of seeping is small), blue incident light rarely passes through the sample 3 and reaches the black plate 4, The black plate 4 is not absorbed and reflected by the sample 3, and the reflectance of the reflected light from the sample 3 is increased.
【００２８】本発明の吸収性物品に用いられる前記表面
シートとしては、織布、不織布等の通常の吸収性物品に
用いられる液透過性のシートを好適に用いることができ
る。本発明の吸収性物品に用いられる前記裏面シートと
しては、透湿シートが好ましく、特に、透湿量が０．７
〜２．８ｇ／１００ｃｍ2 ・ｈである透湿シートが好ま
しい。また、本発明の吸収性物品に用いられる前記吸収
体としては、解繊パルプ等の通常の吸収性物品に用いら
れる吸収体を好適に使用することができる。As the surface sheet used in the absorbent article of the present invention, a liquid-permeable sheet used in ordinary absorbent articles such as woven cloth and nonwoven cloth can be preferably used. The back sheet used in the absorbent article of the present invention is preferably a moisture permeable sheet, and particularly has a moisture permeability of 0.7.
A moisture-permeable sheet having a weight of 2.8 g / 100 cm 2 · h is preferable. Further, as the absorbent body used in the absorbent article of the present invention, an absorbent body used in ordinary absorbent articles such as defibrated pulp can be preferably used.
【００２９】また、本発明の吸収性物品において、その
裏面シートからの上記”裏抜け現象”、特に透湿量が上
記範囲にある上記裏面シートを用いた場合の該裏面シー
トからの上記”裏抜け現象”が生じる程度を少なくする
ためには、上記ＡＰＡＯベース粘着剤を上記裏面シート
（透湿シート）に塗工した後、６０℃で５日間経過後の
該裏面シートの塗工面と反対側の面における上記反射率
の低下率が、２０％以内であることが好ましい。上記反
射率の低下率が２０％超であると、裏面シート表面にベ
タツキ感が生じたり、吸収性物品の諸物性に悪影響が現
れたり、パック保存時に吸収性物品同士のブロッキング
が生じたり、粘着剤組成の変化により接着特性が経時変
化したりする等、種々の不都合が生じるおそれがある。Further, in the absorbent article of the present invention, the above-mentioned "strike-through phenomenon" from the back sheet, especially the "back" from the back sheet when the back sheet having a moisture permeability in the above range is used. In order to reduce the degree of occurrence of "dropout phenomenon", after coating the back sheet (moisture permeable sheet) with the APAO base pressure-sensitive adhesive, the side opposite to the coated surface of the back sheet after 5 days at 60 ° C. It is preferable that the rate of decrease of the reflectance on the surface is within 20%. If the rate of decrease in the reflectance is more than 20%, the back sheet surface may have a sticky feeling, various physical properties of the absorbent article may be adversely affected, blocking between the absorbent articles may occur during pack storage, and stickiness may occur. Various inconveniences may occur, such as changes in adhesive properties over time due to changes in agent composition.
【００３０】本発明の吸収性物品に用いられる上記ＡＰ
ＡＯベース粘着剤は、ＡＰＡＯ自体の分子量が、ゴム系
粘着剤のゴム成分よりも小さく、且つ任意に分子量を調
整できるために、軟化剤成分が少なくても吸収性物品に
使用できる溶融粘度のホットメルト粘着剤とすることが
可能であり、このため、上記反射率の低下率を２０％以
内におさえることが可能である。The AP used in the absorbent article of the present invention
Since the molecular weight of APAO itself is smaller than that of the rubber component of the rubber-based pressure-sensitive adhesive and the molecular weight can be arbitrarily adjusted, the AO-based pressure-sensitive adhesive has a hot melt viscosity that can be used for absorbent articles even if the softening component is small. It is possible to use it as a melt pressure-sensitive adhesive, and therefore, it is possible to suppress the rate of decrease in the reflectance within 20%.
【００３１】[0031]
【作用】本発明の吸収性物品において、弾性率が、吸収
性物品の使用時の温度範囲でタック性の発現しない弾性
率領域にあり、また、基材を接着する温度範囲でタック
性が発現する弾性率領域にあり、更にｔａｎδピーク温
度が溶融状態から固化までの時間を長くするために好適
な範囲にあるＡＰＡＯベース粘着剤を用いることによ
り、本発明の吸収性物品によれば、吸収性物品の使用温
度範囲ではベタツキ感や保存時の基材同士のブロッキン
グが無く、一方、基材を接着する温度範囲ではタック性
及び流動性により充分な強度で接着することができる。
また、上記ＡＰＡＯベース粘着剤は、軟化剤成分を少な
くする配合が可能であるために、透湿シート表面に軟化
剤成分がしみでる”裏抜け現象”が抑えられる。In the absorbent article of the present invention, the elastic modulus is in the elastic modulus region in which the tackiness is not exhibited in the temperature range when the absorbent article is used, and the tackiness is exhibited in the temperature range for bonding the base material. By using an APAO-based pressure-sensitive adhesive in which the tan δ peak temperature is in a range suitable for increasing the time from the molten state to the solidification, In the operating temperature range of the article, there is no stickiness or blocking between the base materials during storage, while in the temperature range where the base materials are adhered, sufficient adhesion can be achieved due to tackiness and fluidity.
Further, since the APAO-based pressure-sensitive adhesive can be compounded with a reduced amount of the softening agent component, the "strikethrough phenomenon", which is caused by the softening agent component on the surface of the moisture-permeable sheet, can be suppressed.
【００３２】[0032]
【実施例】ベースポリマーであるアモルファスポリαオ
レフィン（ＡＰＡＯ）として、プロピレン・エチレン・
ブテン−１共重合体を用い、粘着付与剤樹脂として、Ｃ
9系石油樹脂を用い、軟化剤として、ナフテン系プロセ
スオイルを用い、更に酸化防止剤として、チバガイギ
（株）製のイルガノックス１０１０「ペンタエリスリチ
ル−テトラキス〔３−（３，５−ジ−ｔ−ブチル−４−
ヒドロキシフェニル）プロピオネート〕」を用い、温度
１５０℃、時間４０分の条件の下で、ニーダーにより混
練して、下記〔表１〕に示す特性を持つ２種のＡＰＡＯ
ベース粘着剤を調製した。また、比較のために、ベース
ポリマーにスチレン系ブロックポリマーであるＳＥＢＳ
（スチレン−エチレン−ブチレン−スチレンブロック共
重合体）を用い、その他の成分は同じにして、上記ＡＰ
ＡＯベース粘着剤と同様にして、下記〔表１〕に示す特
性を持つ２種の粘着剤を調製した。上記酸化防止剤の配
合量は、全ての粘着剤において、ベースポリマーに対し
て３重量％にした。Example As a base polymer, amorphous poly-alpha-olefin (APAO), propylene / ethylene /
Using butene-1 copolymer, as a tackifier resin, C
Using 9- based petroleum resin, naphthene-based process oil as a softening agent, and as an antioxidant, Irganox 1010 “pentaerythrityl-tetrakis [3- (3,5-di-t -Butyl-4-
Hydroxyphenyl) propionate] ”and kneaded with a kneader at a temperature of 150 ° C. for 40 minutes to prepare two APAOs having the characteristics shown in [Table 1] below.
A base adhesive was prepared. For comparison, SEBS, which is a styrenic block polymer, is used as the base polymer.
(Styrene-ethylene-butylene-styrene block copolymer) is used, the other components are the same, and the above AP is used.
Two types of pressure-sensitive adhesives having the properties shown in [Table 1] below were prepared in the same manner as the AO-based pressure-sensitive adhesive. The content of the above-mentioned antioxidant was 3% by weight based on the base polymer in all adhesives.
【００３３】上記の各粘着剤を、１５０℃でホットメル
ト（ＨＭ）として不織布上に７０ｍｇ／ｍの塗工量でビ
ード状に塗工し、このビード状のＨＭの温度が４５℃に
なった時点で、この不織布を透湿量１．７ｇ／１００ｃ
ｍ2 ・ｈの透湿シートに貼り付けて、本発明品１、２及
び比較品１、２の各サンプルを作製した。上記の各サン
プルについて、接着力、ベタツキ感やパック保存時
のおむつ（吸収性物品）同士のブロッキング強度（４０
℃、加圧下における粘着剤の流動によるブロッキング強
度）、及び６０℃で２日間保存した場合の、しみだし
による裏抜けの程度を、それぞれ下記〈接着力〉、〈ブ
ロッキング強度〉及び〈しみだしによる裏抜け〉に示す
方法により測定又は評価した。それらの結果を下記〔表
１〕に示す。Each of the above-mentioned pressure-sensitive adhesives was applied as a hot melt (HM) at 150 ° C. on a non-woven fabric in a bead shape at a coating amount of 70 mg / m, and the temperature of the bead-shaped HM became 45 ° C. At this point, this non-woven fabric has a moisture permeability of 1.7 g / 100 c.
Each sample of the invention products 1 and 2 and the comparative products 1 and 2 was produced by sticking it to a m 2 · h moisture-permeable sheet. For each of the above samples, the adhesive strength, stickiness, and blocking strength between diapers (absorbent articles) during pack storage (40
℃, the blocking strength due to the flow of the pressure-sensitive adhesive under pressure), and the extent of strike-through due to bleeding when stored for 2 days at 60 ℃, depending on the following <Adhesive strength>, <Blocking strength> and It was measured or evaluated by the method described in "Strikethrough". The results are shown in [Table 1] below.
【００３４】〈接着力〉２０℃、６５％ＲＨの雰囲気下
で、図２に示すように、チャック８で両端を固定された
上記サンプル３について、該サンプル３を構成する不織
布６を、該不織布６と上記の如くホットメルト粘着剤１
により張り付けられた透湿シート７から剥離速度３００
ｍｍ／ｍｉｎ．で剥離させ、その抵抗値を求めた。<Adhesiveness> As shown in FIG. 2, in an atmosphere of 20 ° C. and 65% RH, with respect to the sample 3 whose both ends are fixed by a chuck 8, the nonwoven fabric 6 constituting the sample 3 is replaced by the nonwoven fabric. 6 and hot melt adhesive 1 as described above
Peeling speed 300 from the moisture permeable sheet 7 attached by
mm / min. Was peeled off and the resistance value was obtained.
【００３５】〈ブロッキング強度〉図３に示すように、
上記サンプル３を２枚重ね合わせ、上から１００ｇ／ｃ
ｍ 2 の圧力をかけて４０℃で７日間保存した。その後、
２０℃、６５％ＲＨの雰囲気下で３０分以上放置し、粘
着剤の流動によって生じた、重ね合わせ面における両サ
ンプル３，３間の接着力を、上記〈接着力〉と同様の方
法で評価した。<Blocking Strength> As shown in FIG.
Two pieces of the above sample 3 are piled up, and 100 g / c from the top
m 2It was stored under pressure at 40 ° C. for 7 days. afterwards,
Leave it in an atmosphere of 20 ° C and 65% RH for 30 minutes or longer to
Both surfaces on the overlapping surface caused by the flow of the adhesive.
The adhesive force between the samples 3 and 3 should be the same as the above <Adhesive force>.
Evaluated by law.
【００３６】〈しみだしによる裏抜け〉上記サンプル
を、６０℃で２日間保存した後、しみだしによる透湿シ
ートの裏抜けを目視により観察した。尚、〔表１〕中の
記号○は、しみだしが殆ど生じなかったことを示し、×
は、しみだしが大きく生じたことを示す。また、しみだ
しの程度を定量的に測定するために、図１に示すように
上記サンプル３の上に黒色プレート４を置き、波長４５
９ｎｍの青色入射光の反射率を測定した。測定した反射
率に基づいてその低下率を算出し、〔表１〕に併記し
た。尚、上記反射率は、色差計（日本電気工業社製）を
用いて測定した。また、上記反射率の低下率は、次の
〔数１〕により算出した。<Strikethrough due to bleeding> After the above sample was stored at 60 ° C. for 2 days, the bleeding through of the moisture permeable sheet due to bleeding was visually observed. In addition, the symbol ◯ in [Table 1] indicates that almost no exudation occurred, and ×
Indicates that a large amount of exudation has occurred. Further, in order to quantitatively measure the degree of exudation, a black plate 4 was placed on the sample 3 as shown in FIG.
The reflectance of blue incident light of 9 nm was measured. The reduction rate was calculated based on the measured reflectance and is also shown in [Table 1]. The reflectance was measured using a color difference meter (manufactured by Nippon Electric Industry Co., Ltd.). Further, the rate of decrease in the reflectance was calculated by the following [Equation 1].
【００３７】[0037]
【数１】 （反射率の低下率）＝（ａ−ｂ）／ａ＝１−（ｂ／ａ） 〔％〕 ａ：ブランクの反射率 ｂ：２日間経過した後の反射率## EQU1 ## (Reduction rate of reflectance) = (ab) / a = 1- (b / a) [%] a: reflectance of blank b: reflectance after two days have passed
【００３８】また、各サンプルについてのｔａｎδピー
ク温度は、粘弾性測定装置（セイコ−電子工業社製ＤＭ
Ｓ−１１０）を用いて次の方法により測定した。周波数
１Ｈｚの曲げモードにより、測定した。温度に対してｔ
ａｎδをプロットし、その最大値における温度を求め
た。The tan δ peak temperature for each sample is measured by a viscoelasticity measuring device (DM manufactured by Seiko Denshi Kogyo KK).
S-110) was used to measure by the following method. The measurement was performed in a bending mode with a frequency of 1 Hz. T for temperature
An δ was plotted and the temperature at the maximum value was determined.
【００３９】[0039]
【表１】 [Table 1]
【００４０】上記〔表１〕から明らかなごとく、本発明
品１及び２は、不織布と透湿シート間の接着力が発現し
ており、しかもサンプル間のブロッキングは殆どおこっ
ていなかった。As is apparent from the above [Table 1], in the products 1 and 2 of the present invention, the adhesive force between the nonwoven fabric and the moisture permeable sheet was exhibited, and blocking between the samples was hardly caused.
【００４１】即ち、この系では、基材を接着する温度範
囲では、粘着剤にタック性があり、且つある程度の流動
性もあるために、接着力が発現したのに対し、おむつ
（吸収性物品）使用温度範囲では、粘着剤にタック性が
無いために、接着力が発現せず、基材間のブロッキング
やベタツキが生じなかった。また、本発明品１及び２に
おいては、粘着剤のオイル成分のしみだしによる”裏抜
け現象”は殆ど生じないことが確認された。That is, in this system, in the temperature range in which the base material is adhered, the adhesive has tackiness and has a certain degree of fluidity, so that the adhesive force is exhibited, whereas the diaper (absorbent article). ) In the operating temperature range, since the adhesive has no tackiness, the adhesive force was not expressed, and blocking or stickiness between the base materials did not occur. In addition, it was confirmed that in the products 1 and 2 of the present invention, the "strikethrough phenomenon" due to the seepage of the oil component of the pressure-sensitive adhesive hardly occurred.
【００４２】これに対し、比較品１及び２は、粘着剤の
ベースポリマーがスチレン系のブロックポリマーである
ために、軟化剤成分の割合を多くせざるを得ず、その結
果、弾性率が本発明品に用いられるＡＰＡＯベース粘着
剤に比べ小さく、基材を接着する温度範囲、及びおむつ
（吸収性物品）使用温度範囲でタック性が発現するため
に、使用温度範囲で接着力が発現し、基材間のブロッキ
ングやベタツキが生じてしまった。また、比較品３は、
ベースポリマーにＡＰＡＯを使用しているが、石油樹脂
（粘着付与剤樹脂）を多量に含有しているために弾性率
が小さくなり、基材を接着する温度範囲、及びおむつ
（吸収性物品）使用温度範囲でタック性が発現したため
に、接着力が発現し、基材間のブロッキングやベタツキ
が生じてしまった。On the other hand, in Comparative Products 1 and 2, since the base polymer of the pressure-sensitive adhesive was a styrene block polymer, the proportion of the softener component had to be increased, and as a result, the elastic modulus was It is smaller than the APAO-based pressure-sensitive adhesive used in the invention product, and because the tackiness is exhibited in the temperature range for adhering the base material and the operating temperature range of the diaper (absorbent article), the adhesive force is exhibited in the operating temperature range, Blocking and stickiness between the base materials occurred. Comparative product 3 is
Although APAO is used as the base polymer, since it contains a large amount of petroleum resin (tackifier resin), the elastic modulus becomes small, the temperature range for adhering the base material, and the use of diapers (absorbent articles) Since the tackiness was developed in the temperature range, the adhesive force was developed and blocking or stickiness between the base materials was caused.
【００４３】[0043]
【発明の効果】本発明の吸収性物品は、吸収性物品の製
造時には、基材への接着性が良好であり、その使用時に
は、低タック性でべたつき感が無いにも拘わらず基材と
の接着性が良好であって且つ粘着剤中の組成成分である
軟化剤等のしみだし成分が透湿シートの表面にしみだ
す”裏抜け現象”がほとんどないものである。EFFECT OF THE INVENTION The absorbent article of the present invention has good adhesiveness to a base material during the production of the absorbent article, and has a low tackiness and a non-sticky feeling when used as a base material. The adhesiveness is good, and there is almost no "strikethrough phenomenon" in which a oozing component such as a softening agent which is a composition component in the pressure-sensitive adhesive oozes on the surface of the moisture-permeable sheet.
【図面の簡単な説明】[Brief description of drawings]
【図１】図１は、接着力の試験におけるサンプルの剥離
方法を示す図である。FIG. 1 is a diagram showing a method of peeling a sample in an adhesive strength test.
【図２】図２は、ブロッキング試験におけるサンプルに
対する加圧方法を示す図である。FIG. 2 is a diagram showing a pressing method for a sample in a blocking test.
【図３】図３は、”裏抜け現象”を定量的に測定する方
法の測定原理図である。FIG. 3 is a measurement principle diagram of a method for quantitatively measuring a “strikethrough phenomenon”.
１ 粘着剤 ３ サンプル ４ 黒色プレート ５ 透明ガラス板 ６ 不織布 ７ 透湿シート ８ チャック 1 Adhesive 3 Sample 4 Black plate 5 Transparent glass plate 6 Nonwoven fabric 7 Moisture permeable sheet 8 Chuck
Claims (6)
面シート及びこれら両シート間に介在する吸収体とを有
し、粘着剤により一体化された吸収性物品において、上
記粘着剤が、アモルファスポリαオレフィン及び粘着付
与剤樹脂を含有することを特徴とする吸収性物品。1. An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed between these sheets, which is integrated by an adhesive, wherein the adhesive is An absorbent article containing an amorphous poly-α-olefin and a tackifier resin.
する請求項１記載の吸収性物品。2. The absorbent article according to claim 1, wherein the pressure-sensitive adhesive contains a softening agent.
〜１０8 Ｐａ、４０〜６０℃で１０5 〜１０7 Ｐａであ
ることを特徴とする請求項１又は２記載の吸収性物品。3. The elastic modulus of the pressure-sensitive adhesive is 10 7 at 0 to 40 ° C.
It is 10 < 8 > Pa, 10 < 5 > -10 < 7 > Pa at 40-60 degreeC, The absorbent article of Claim 1 or 2 characterized by the above-mentioned.
正接（ｔａｎδ）ピーク温度が０〜４０℃に存在するこ
とを特徴とする請求項１〜３の何れかに記載の吸収性物
品。4. The absorbent article according to claim 1, wherein a loss tangent (tan δ) peak temperature is present at 0 to 40 ° C. in the dynamic viscoelasticity curve of the pressure-sensitive adhesive.
ｇ／１００ｃｍ2 ・ｈであることを特徴とする請求項１
〜４の何れかに記載の吸収性物品。5. The moisture permeability of the back sheet is 0.7 to 2.8.
g / 100 cm 2 · h.
The absorbent article according to any one of to 4.
℃で５日間経過後の該裏面シートの塗工面と反対側の面
における反射率の低下率が、２０％以内であることを特
徴とする請求項５記載の吸収性物品。6. After applying the adhesive to the back sheet, 60
The absorbent article according to claim 5, wherein the rate of decrease in reflectance on the surface of the backsheet opposite to the coated surface after 5 days at 20 ° C is 20% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04031916A JP3093413B2 (en) | 1992-02-19 | 1992-02-19 | Absorbent articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04031916A JP3093413B2 (en) | 1992-02-19 | 1992-02-19 | Absorbent articles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05228172A true JPH05228172A (en) | 1993-09-07 |
| JP3093413B2 JP3093413B2 (en) | 2000-10-03 |
Family
ID=12344306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04031916A Expired - Lifetime JP3093413B2 (en) | 1992-02-19 | 1992-02-19 | Absorbent articles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3093413B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5901706A (en) * | 1997-06-09 | 1999-05-11 | Kimberly-Clark Worldwide, Inc. | Absorbent surgical drape |
| US5981012A (en) * | 1997-11-25 | 1999-11-09 | Kimberly-Clark Worldwide, Inc. | Flushable release liner comprising a release coating on a water-sensitive film |
| US5985396A (en) * | 1997-11-25 | 1999-11-16 | Kimberly-Clark Worldwide, Inc. | Flushable release liners and methods of making the same |
| US6530910B1 (en) | 1997-12-31 | 2003-03-11 | Kimberly-Clark Worldwide, Inc. | Flushable release film with combination wiper |
| US6638603B1 (en) | 1997-08-15 | 2003-10-28 | Kimberly-Clark Worldwide, Inc. | Screen printed coating on water-sensitive film for water protection |
| US6891080B2 (en) * | 1999-04-12 | 2005-05-10 | Kao Corporation | Disposable diaper and absorbent member used therein |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0592180U (en) * | 1992-03-23 | 1993-12-14 | 株式会社コバヤシ | Fruit tray |
| US6533765B1 (en) | 1998-05-01 | 2003-03-18 | The Procter & Gamble Company | Absorbent articles having a lotion resistant adhesive |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS573712B2 (en) * | 1974-02-05 | 1982-01-22 | ||
| JPS58149303A (en) * | 1982-03-02 | 1983-09-05 | 花王株式会社 | Disposable diaper |
| JPH0282974A (en) * | 1988-09-20 | 1990-03-23 | Nitto Denko Corp | Method for fixing diaper |
| JPH0286676A (en) * | 1988-09-21 | 1990-03-27 | Ube Ind Ltd | Hot-melt adhesive composition |
| JPH02209936A (en) * | 1989-02-09 | 1990-08-21 | Japan Synthetic Rubber Co Ltd | Composition for vibration-damping and sound-insulating material |
| JPH0337062A (en) * | 1989-07-03 | 1991-02-18 | Nitta Gelatin Inc | Manufacture of disposable product |
-
1992
- 1992-02-19 JP JP04031916A patent/JP3093413B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS573712B2 (en) * | 1974-02-05 | 1982-01-22 | ||
| JPS58149303A (en) * | 1982-03-02 | 1983-09-05 | 花王株式会社 | Disposable diaper |
| JPH0282974A (en) * | 1988-09-20 | 1990-03-23 | Nitto Denko Corp | Method for fixing diaper |
| JPH0286676A (en) * | 1988-09-21 | 1990-03-27 | Ube Ind Ltd | Hot-melt adhesive composition |
| JPH02209936A (en) * | 1989-02-09 | 1990-08-21 | Japan Synthetic Rubber Co Ltd | Composition for vibration-damping and sound-insulating material |
| JPH0337062A (en) * | 1989-07-03 | 1991-02-18 | Nitta Gelatin Inc | Manufacture of disposable product |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5901706A (en) * | 1997-06-09 | 1999-05-11 | Kimberly-Clark Worldwide, Inc. | Absorbent surgical drape |
| US6638603B1 (en) | 1997-08-15 | 2003-10-28 | Kimberly-Clark Worldwide, Inc. | Screen printed coating on water-sensitive film for water protection |
| US5981012A (en) * | 1997-11-25 | 1999-11-09 | Kimberly-Clark Worldwide, Inc. | Flushable release liner comprising a release coating on a water-sensitive film |
| US5985396A (en) * | 1997-11-25 | 1999-11-16 | Kimberly-Clark Worldwide, Inc. | Flushable release liners and methods of making the same |
| US6294238B1 (en) | 1997-11-25 | 2001-09-25 | Kimberly-Clark Corporation | Flushable release liner comprising a release coating on a water-sensitive film |
| US6296914B1 (en) | 1997-11-25 | 2001-10-02 | Kimberly-Clark Corporation | Flushable release liners and methods of making the same |
| US6530910B1 (en) | 1997-12-31 | 2003-03-11 | Kimberly-Clark Worldwide, Inc. | Flushable release film with combination wiper |
| US6891080B2 (en) * | 1999-04-12 | 2005-05-10 | Kao Corporation | Disposable diaper and absorbent member used therein |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3093413B2 (en) | 2000-10-03 |
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