JP7221987B2 - 捲縮型複合纎維の不織布及びその積層体、並びにその物品 - Google Patents
捲縮型複合纎維の不織布及びその積層体、並びにその物品 Download PDFInfo
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- JP7221987B2 JP7221987B2 JP2020558439A JP2020558439A JP7221987B2 JP 7221987 B2 JP7221987 B2 JP 7221987B2 JP 2020558439 A JP2020558439 A JP 2020558439A JP 2020558439 A JP2020558439 A JP 2020558439A JP 7221987 B2 JP7221987 B2 JP 7221987B2
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- nonwoven fabric
- propylene
- based polymer
- polymer component
- nonwoven
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A—HUMAN NECESSITIES
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- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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Description
第1プロピレン系重合体成分と第2プロピレン系重合体成分とを含む捲縮型複合纎維の不織布であって、前記第1プロピレン系重合体成分及び前記第2プロピレン系重合体成分は、示差走査熱量計(DSC)で測定される前記第2プロピレン系重合体成分の融点が、前記第1プロピレン系重合体成分の融点より30℃以上高く、前記第1プロピレン系重合体成分と前記第2プロピレン系重合体成分との、ASTM D1238によって測定される溶融指数(MFR:測定温度230℃、荷重2.16kg)の比(第2成分/第1成分)が1.7以上であり、前記第1プロピレン系重合体成分/前記第2プロピレン系重合体(重量比)で表示される成分比が、50/50ないし10/90である捲縮型複合纎維不織布を提供する。
少なくとも2層以上の層構成を有する不織布積層体であり、そのうち少なくともなくとも1層が、前記捲縮型複合纎維の不織布である不織布積層体を提供する。
前記不織布積層体を含む物品を提供する。
OPU(%)=(W1-W0)/W0X100
第1プロピレン系重合体成分(A)、第2プロピレン系重合体成分(B)及びエルカ酸アミドスリップ剤を使用し、スパンボンディング法により、複合溶融紡糸を実施し、図2の構成を有するサイドバイサイド型複合纎維を捕集面上に堆積させ、図1に図示されたエンボシングパターンにより、上部温度が146℃であり、下部温度が144℃に加熱されたカレンダーロールを使用し、エンボシング加工を施し、捲縮型複合纎維を含む不織布を製造した。前記第1プロピレン系重合体成分(A)及び前記第2プロピレン系重合体成分(B)の種類、物性及び含量比、エルカ酸アミドスリップ剤の含量、及びエンボシングパターンの特性を、下記表1に示した。下記表1において、MFRは、ASTM D1238により、温度230℃、荷重2.16kgの条件下で測定された溶融指数を意味し、スリップ剤含量は、不織布全体重量対比における重量を意味する。
前記実施例1~6、及び比較例1~5で製造されたそれぞれのスパンボンド不織布の物性を、下記のような方法で評価し、その結果を下記表2に示した。
前記実施例1~6、及び比較例1~5で製造されたそれぞれのスパンボンド不織布を4枚ずつ積層し、不織布積層体を製造した。その後、前記各不織布積層体の物性を、下記のような方法で評価し、その結果を下記表3に示した。
Claims (12)
- 第1プロピレン系重合体成分と第2プロピレン系重合体成分とを含む捲縮型複合纎維の不織布であって、
前記第1プロピレン系重合体成分及び前記第2プロピレン系重合体成分は、示差走査熱量計(DSC)で測定される前記第2プロピレン系重合体成分の融点が、前記第1プロピレン系重合体成分の融点より、30℃以上高く、前記第1プロピレン系重合体成分と前記第2プロピレン系重合体成分との、ASTM D1238によって測定される溶融指数(MFR:測定温度230℃、荷重2.16kg)の比(第2成分/第1成分)が1.7以上であり、前記第1プロピレン系重合体成分/前記第2プロピレン系重合体(重量比)で表示される成分比が、50/50ないし10/90であり、
前記不織布は、炭素数5ないし25の脂肪酸アミドを、前記不織布全体重量対比で、0.01ないし3重量%の含量でさらに含み、
前記捲縮型複合纎維は、サイドバイサイド型の複合纎維である捲縮型複合纎維の不織布。 - 前記第1プロピレン系重合体成分及び前記第2プロピレン系重合体成分は、それぞれ互いに独立して、プロピレン単独重合体、プロピレン・エチレン共重合体、ポリプロピレンにエチレンが共重合されたエラストマー系ランダム共重合体、プロピレン・エチレン・ブチレン三元重合体、またはそれらの組み合わせを含む、請求項1に記載の捲縮型複合纎維の不織布。
- 前記不織布は、エンボシング部及び非エンボシング部を含み、前記エンボシング部は、オープンエンボシングタイプであり、同一でもあったり、異なったりする間隔で、連続して配列された複数個の単位エンボシングパターン部を含む、請求項1に記載の捲縮型複合纎維の不織布。
- 前記単位エンボシングパターン部に含まれたそれぞれのエンボシングパターンは、面積が0.2ないし0.7mm2である、請求項3に記載の捲縮型複合纎維の不織布。
- 前記不織布は、ボンディング率が13%以下である、請求項3に記載の捲縮型複合纎維の不織布。
- 前記不織布は、スパンボンド不織布である、請求項1に記載の捲縮型複合纎維の不織布。
- 少なくとも2層以上の層構成を有する不織布積層体であり、そのうち少なくとも1層が請求項1ないし6のうちいずれか1項に記載の捲縮型複合纎維の不織布である不織布積層体。
- 前記不織布は、スパンボンド不織布であり、前記スパンボンド不織布4枚が積層されてなるものであり、均一度(CV%)が3%以下である、請求項7に記載の不織布積層体。
- 前記不織布積層体は、厚みが0.02mm以上であり、クリンプ数が10個/10mm以上であり、ボンディング率が13%以下であり、各エンボシングパターンのボンディング領域のMD剛軟度が50mm以下である、請求項8に記載の不織布積層体。
- 請求項7ないし9のうちいずれか1項に記載の不織布積層体を含む物品。
- 前記物品は、おむつ、吸収用品、排便用品、支持層またはトップシートである、請求項10に記載の物品。
- 前記物品がおむつである場合、前記不織布積層体は、親水剤含浸量(OPU)が0.7%以下であり、前記不織布積層体が前記おむつのトップシート層に適用されたとき、前記物品は、3sec以下の水の吸収速度を有する、請求項11に記載の物品。
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