JPH02243336A - 多層重合体フイルム - Google Patents

多層重合体フイルム

Info

Publication number
JPH02243336A
JPH02243336A JP1162483A JP16248389A JPH02243336A JP H02243336 A JPH02243336 A JP H02243336A JP 1162483 A JP1162483 A JP 1162483A JP 16248389 A JP16248389 A JP 16248389A JP H02243336 A JPH02243336 A JP H02243336A
Authority
JP
Japan
Prior art keywords
filler
layer
multilayer film
base layer
polymer
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
Application number
JP1162483A
Other languages
English (en)
Other versions
JP2950852B2 (ja
Inventor
James C Baird
ジェームズ、クラーク、ベアード
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22787261&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JPH02243336(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of JPH02243336A publication Critical patent/JPH02243336A/ja
Application granted granted Critical
Publication of JP2950852B2 publication Critical patent/JP2950852B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

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    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
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  • Biomedical Technology (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
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Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 ［産業上の利用分野コ 本発明は一種または複数種の充填剤を含有する重合体フ
ィルムに関するものであり、特に高濃度の充填剤を含有
する多層フィルムに関するものである。この充填剤は不
透明化顔料または白化顔料を含む。
〔従来技術と問題点］ 本発明は、高率の顔料またはその他の充填剤を含有する
重合体多層フィルムに関するものである。
薄い重合体フィルムの不透明度を増進しまたはこのフィ
ルムを白化しまたはその光学特性を変性するため、フィ
ルムに対してしばしば顔料が添加される。また重合体フ
ィルムのカサを増大しあるいはフィルムのコストを低下
させるためにフィルムに灯してその他の充填剤が添加さ
れる０重合体基質に対して高レベルの充填剤を添加する
事に伴う１つの問題は、フィルムの引裂強さ、引っ張り
強さおよび柔らかさなどの材料特性に対する悪影響がし
ばしば生じる事である。このような材料特性に対する悪
影響のために、重合体フィルムに添加される不透明化顔
料および白化顔料などの充填剤の割合すなわち濃度がＩ
′！Ｉ限される事が多い。
米国特許４，５２１，４３７号は、フィルムの材料特性
に悪影響を及ぼさないように顔料添加量を１５を量％に
制限できる事を教示している。また米国特許筒３．１５
４，４８１号は、２５重量％までの果粒状材料を含有す
る重合体フィルムを教示している。しかしこの教示方法
は、不透明度を生じるため、さらにフィルムをその重合
体の二次転移温度以上の温度で２軸延伸する必要がある
。米国特許第３，９００，６７０号は、２６〜５０重重
％の充填剤を含有する多層フィルムを開示している。し
かしこの引例もフィルム内部の空隙の形成によって不透
明度を生じるために２軸延伸を必要とする。
従って、薄いフィルムの不透明度または白色度は添加さ
れる不透明化顔料および白化顔料の濃度によって制限さ
れる。また不透明度を生じるためのフィルムの延伸処理
は製造工程に１段階を追加し、これがコストを増大させ
る。
［発明の目的および効果］ 本発明の目的は、高濃度の顔料またはその他の充填剤を
含有して白色に成される薄い不透明フィルムを提供する
にある。また本発明の目的は、顔料またはその他の充填
剤の高濃度の故に材料特性を著しく低下させる事のない
フィルムを提供するにある。さらに本発明の目的は、製
造工程の一部として延伸段階を必要としないフィルムを
提供するにある。
〔発明の概要］ 本発明は実質的に重合体材料から成るφなくとも１つの
ベース層と、前記ベース層に対して実質的に連続的に接
合された少なくとも１層の充填剤含有重合体層を含む重
合体多層フィルムを提供する。充填剤含有層は、その内
部に約１５乃至約６０重量％の充填剤を実質的に均一に
分散され、また多層フィルムの全厚さの約２０％を超え
ない厚さを有する。
以下、本発明を図面に示す実施例について詳細に説明す
る。
［実施例］ 第１図について述べれば９本発明は少なくとも２／Ｗか
ら成り、約０．２５ｍｍ（０，０１インチ）の全厚さを
有する多＃ｆ（合体フィルム２０に関するものである。
第１層２乙すなわちベース層は多層フィルム２０の厚さ
の大部分、約８０〜９５％を成し、通常の重合体材料か
ら成る。またこの多層フィルム２０はその厚さの残分、
約２０％以下を成す第２層２４を有し、この第２／ＩＴ
は高率の充填剤２６を含有する。
ベース＃２２が多層フィルム２０の材料特性を実質的に
制御するように、このベースＥＩ２２が多層フィルム２
０において厚く、その約８０％乃至約９５％、好ましく
は少なくとも９０％の厚さを有する事が重要である。ベ
ースＮ２２を多層フィルム２０に対して厚く保持する事
により、この多層フィルムの材料特性はベースＮ２２の
特性に近似し、ｊＩＩＪ２４中の充填剤２６の存在によ
って悪影響を受けない。
ベース層２２について選ばれる材料は加工可能であって
、フィルム状に形成できるものでなければならない０重
合体フィルムの仕上げ後の特性、特に引裂抵抗、引っ張
り強さ、弾性係数および用途によって必要とされるその
他の特性について特別に注意しなければならない、この
重合体フィルム２０が人体と接触する消費材料の中に使
用される場合、重合体フィルム２０は柔らかで、人体の
表皮その他の接触点に対して安全でなければならない。
好ましい重合体材料はポリオレフィン、特にポリエチレ
ン、ポリプロピレン、および少なくとも−の 央レフイン成分を含む共重合体である。ポリエステル、
ナイロン、その共重合体および前記化合物の組合せなど
、他の材料も適当である。
所望ならば、第１層２２の不透明度を増大するためにこ
の第１層重合体基質に対して所望量の、代表的には１乃
至１５重量％の白化剤（図示されず）を添加する事がで
きる。二酸化チタンおよび炭酸カルシウムなどの白化剤
の割合は、第１　＃　２２の特性と、重合体フィルム２
０の用途によって制限される０例えば、本発明の多層フ
ィルム２０がオシメまたは月経パッドに使用される場合
＋　　ｊＩ１層２２が約１０重量％以上の充填剤レベル
を含有すれば、これを皮膚にあてた場合に不愉快な粗い
感触を与える。
所望ならば第１Ｎ２２は白化剤顔料の代わりに着色顔料
を含有する事ができる。第１着色顔料を第１＃２２の中
に使用し、第２層２４に白色顔料または第２着色顔料を
使用すれば、各側において相異なる色を有する薄いフィ
ルム２０が得られる。
第２Ｊ１２４．すなわち重合体充填剤含有層は重合体基
質と高濃度の顔料またはその他の加工可能の充填剤２６
とを含む。この第２重合体基質に適した材料はポリオレ
フィン、例えばポリエチレンおよびポリプロピレン、お
よび少なくとも一つのオレフィン成分を有する共重合体
である。ポリエステル、ナイロン、その共重合体、およ
びそれらの組合せなどの他の材料も適当である。高濃度
の充填剤２６を収容するために可撓性の弾性基質が望ま
しいので、エチレン−酢酸ビニール共重合体などの比較
的柔らかな材料が有効である。
第２層の不透明化、白色化または着色のために、約１５
〜約６０重景％の顔料充填剤２６を添加する事ができる
。不透明であるほかに白色がかった外観をもつフィルム
２０が望ましい事が多いので、特にこのフィルム２０が
月経バッド、オシメなどの使い捨て消耗品に使用される
場合に、二酸化チタンまたは炭酸カルシウムなどの白化
顔料を選択する事ができる。多層フィルム２０のつや消
し面をうるためまたはブロッキングを防止するため、第
２層２４の中にシリカ充填剤を使用する事ができる。約
５０重量％の充填剤２６を使用し、この充填剤は二つの
型に等分され、一方の充填剤を顔料とする事が効果的で
ある事が発見された８例えば、約２５重量％の二酸化チ
タンと約２５重量％のシリカ充填剤とを含有するエチレ
ン−酪酸ビニル共重合体から成る第２層２４は白色つや
消し面を有するフィルムを成す。
他の有効な充填剤２６はカーボンブラックなどの着色顔
料を含む、多層フィルム２０を補強するため、レーヨン
などのフィラメント充填剤を第２層２４の中に加える事
ができる。
第２層の重合体基質と異なる屈折率を有する光屈折性充
填剤２６を使用する事により、製造工程の一部として、
延伸する事なく白色不透明フィルム２０を製造する事が
できる。第２層２４の着色は、充填剤２６によって屈折
される光線の散乱の結果であって、フィルム２０の延伸
によって作られた空隙の結果ではない、二酸化チタン、
炭酸カルシウムおよびシリカは前記の重合体と協働して
、光屈折ζ：よる白色化と不透明化を生じる。
第２＃２４は多層フィルム２０の厚さ全体に対して薄く
、フィルムの厚さの約５〜約２０％、好ましくは１０％
以下である。このような第２層２４の割合は、多層フィ
ルム２０を過度に脆くし、または裂は易くする事を防止
するために重要である。またもし第２ＩＷ２４が皮膚と
接触させられる場合、この第２ＮＩ２４がこれよりはる
かに厚い可撓性の第１層２２に接合されていれば快適な
感触を与える。多層フィルム２０の厚さ全体に対してｗ
１２層２４を比較的薄く保持する事により、第１層２２
の望ましい特性が実質的に保持される。
第２層２４の厚さがこの層に加えられる充填剤２６の粒
径および割合に対応させられる必要がある。
ｆｌｉ２Ｎ２４は高い充填剤含有量の故に脆くて破断し
やすいが、充填剤粒子２６が第２Ｎ２４の重合体材料に
よって完全に収容されないほどに、あるいは第２Ｎ２４
の表面から突出するほどにこれらの粒子２６が大きくま
たは第２＃２４が薄くあってはならない。
さもなければ、充填剤粒子２６が重合体基質から引き離
され、不透明化、着色、ブロンキング防止作用、補強作
用などを妨げる。約０．５〜８ミクロンの平均粒径を存
する充填剤２６が一般に適当である。
また第２層２４の厚さは、第２４２４に加える事のでき
る充填剤の重量％を制限する０本発明の多層フィルム２
０においては６０！ｉ量％以上の充填剤濃度が可能であ
るが、充填剤濃度は、粒子２６を第２Ｎ２４の重合体基
質全体に完全に分散させ、第１＃２２との界面から第２
層２４の外側面までの間に固形の比較的連続的な堆積を
成す事のない程度に低くなければならない、１５重量％
以下の充填剤濃度も可能であるが、これは概して本発明
の多層フィルム２０を必要としない。１５重量％以下の
充填剤濃度は従来公知の方法によって得られるが、この
ような１５％以下の充填剤濃度の欠点、例えば粗い感触
は本発明のフィルムにおいは、低い充填剤濃度のベース
層２２を皮膚に接触させ、充填剤含有層２４を皮膚から
このベースＮ２２によって遮断する事によって解決する
事ができる。
前記の両方の層を好ましくは連続的に接合して一体的多
層フィルム２０を生じる必要がある。連続的接合により
、第１ｊｉｉ！すなわちベースＮ２２によって材料特性
を制御する事ができる。充填剤含有不透明化層２４はそ
の充填剤２６の高濃度の故に脆いので、この第２７＃Ｉ
２４は亀裂または破断を生じる事なく別個に製造しまた
操作する事が困難である。従って多層フィルム２０を製
造する好ましい方法は共押出し法である。
２層を実質的に連続的な一体的な多層フィルム２０の形
に接合する際の問題を防止するため、第１層および第２
について選定される重合体は相客性であって相互に固着
性でなければならない。またこれらの１−が共押出しに
よって接合される場合、これらの層の重合体が相互に対
応するメルトインデックスと融点とを有する事が重要で
ある。
もしこれらの層が相容性でなく自己接着性でなければ、
これらのベース層２２と第２＃２４の間に結合層または
相容性化Ｎ（図示されず）を介在させる事ができる。こ
の相容性化層または結合層は結合される層の材料の共重
合体であって、その両側層の中間特性を有する。
２ＩＷから成る本発明の多層フィルム２０を共押出しす
るためには、第１７１２２の重合体樹ＩＪＶＩ−ｉ有ベ
レットと、０〜１５重量％の顔料またはその他の充填剤
を含有するペレットとをつくり、実質的に均一な第１混
合物が得られるまでホッパの中で混合する。第２層２４
の組成物を形成するためには、この第２ｆｆｉの重合体
樹脂含有ペレットと、約１５〜６０重量％の充填剤含有
ペレットとを作る。充填剤２６を含有するペレットは、
第２Ｎの重合体樹脂ペレットと混合される単数または複
数の型の充填剤および顔料を含む、これらの充填剤含有
ペレットと第２層重合体樹脂ペレットとをホッパの中で
混合して実質的に均一な第２混合物を得る。
前記の２種の均一混合物をそれぞれ別個の可塑化押出機
の中に送入し、これらの押出機は、第１層２２とＷ２層
２４との所望の割合、代表的には９：１の割合を生じる
事のできる共押出しフィードブロックに連結されている
。これらの混合物は可塑化押出機の中で溶融され、フィ
ードブロックを通してそれぞれペレットに適した圧力条
件と温度条件のもとに同時に押し出され、第１層２２と
ｆｆ！２層２４の所望の比率を有する断面の実質的に連
続的共押出し多層シートを形成する。
共押出しフィードブロックから出る実質的に連続的な多
層シートがコートハンガ型フイルムダイスまたはその他
、清流を保持するに適した長方形断面のフィルムダイス
の中に送入されて、約０．５ｍｍ（０，０２インチ）ま
たはこれ以下の厚さの実質的に連続的共押出し多層フィ
ルムを形成する。多層フィルムがダイスを通して押し出
される際に、屡の割合は変更せず、所定の割合に例えば
９：　１に保持される。
実質的に連続的な多層フィルムを回転中のチルロール上
に送り、このロールが多層フィルムの冷凍または結晶化
を生じる。多層フィルムがダイスから出る際にフィルム
の堆積が生じないように、回転チルロールの表面速度は
ダイスから出る多層フィルムの表面速度と同等またはこ
れ以上でなければならない。このような相対表面速度の
相違の結果、シートの追加的薄化またはネッキングを生
じ、所望の最終厚さ、代表的には約０．２５ｍｍ（０，
０１インチ）以下の厚さのフィルムを生じる。フィルム
はチルロールを出た後に、巻取られまたはその他の通常
方法で貯蔵される。あるいは多層フィルムは直接に二次
加工段階に送られる。
前記の共フィードブロックーフィルムダイス組立体の代
わりに、共押出しダイスを使用する事ができる。この共
押出しダイスは複数の可塑化押出機から実質的に均一な
混合物を受け、前記のような所望割合の多層フィルムを
共押出しし、つぎに回転チルロール上に送る。
本発明の多層フィルムを成形する第２法は、共押出しブ
ロー成形法である。前記のようにして２種の実質的に均
一な混合物を作り、これを可塑化押出機に送給し、この
押出機は円形断面の共押出しブローフィルムダイスに連
結され、このダイスは１代表的には約９：１の割合の第
１層２２と第２層２４を生じる環状オリフィスを備える
。２種の均一混合物が可塑化押出機中で溶融され、ダイ
スのリップから、テーパ中空シリンダ形状の連続垂直シ
ートとして押し出され、引っ張りロールによってダイス
から引き出される。
同時に、ガスまたは空気をダイスを通して送り、前記中
空シリュｌダ状多層シートの内部に送ってこのシートを
放射方向に拡張させる。連続多層シートが立ち上がる際
に周囲空気に対する伝熱作用によって冷却され冷凍され
る。固化した多層シートを圧潰し折り畳みまたは巻取っ
て、所望のように貯蔵する。
前記のいずれかの方法によって作られたフィルムを成形
スクリーンに当接させ、真空作用を加え、またフィルム
の上向き面に対して空気ジェットまたは水ジェツトを加
える事によってアパチュアを備える事ができる。この工
程は米国特許第４，１５４゜２４０号に記載され、これ
を引例として加える。あるいは、米国特許第４，５５２
，７０９号に記載のようにフィルムをチルロールの上に
送る前にアパチュアを備える事ができる９　この特許を
引例として加える。
前記の共押し出し法の実施例は、２ＮＮ型層フィルム２
０に関するものであるが、当業者には明かなように、第
３均一混合物を加え、所望割合の積層構造を生じるよう
に押し出しフィードブロックまたは可塑化押し出し器の
フィルムダイスを調整する事によって、２種の３層フィ
ルムを形成する事ができる。第１型の３７Ｗフイルム１
２０　　（５２図）は両側にベース層１２２を有する。
これら外側のベースｆｆ１２２の中間に中央充填剤含有
層１２４が介在し、この介在層は第１面と第２面を有し
、各面がそれぞれ外側ベースＮ１１２２の一方の面と連
続的に接合される。前記の２層実施例２０と同様に、中
心充填剤含有ｊ９ｉＦ１２４はフィルム１２０の全厚さ
と比較して薄く。
約５〜２０％の厚さを有し、また約１５〜６０重量％の
充填剤１２Ｂは実質的に均一に分散されている。
ベース層１２２は、フィルム１２０の厚さの約８０〜約
９５％を占め、またこれらのベース層の不透明度、色彩
または白色度を増進するために約１〜約１５重量％の充
填剤（図示されず）をその内部に分散する事ができる。
ベース層１２２は用途に従って同一の組成または相異な
る組成を有する事ができる。この３層構造は、ベースＩ
′Ｗ１２２につむ）てα−オレフィン重合体などの材料
を選定する事により、多層フィルム１２０のいずれかの
表面を柔らかに可撓性番こ成し、皮膚に対して良い感触
を与える事ができる。
第３図に図示の第２型の３ｐＩ多層フィルム２２０は２
Ｎの外側充填剤含有ｆ＠２２４を有する。これらの外側
層２２４の中間に中心ベース層２２２が介在させられ、
このベース層第１側面と第２側面を有し、各側面が外側
ｙＩ２２４に対して実質的に連続的に接合されている。
前記の各実施例と同様に、外側充填剤含有ｒＩｊＩ２２
４の合計厚さは多層フィルム２２０の全厚さと比較して
薄い。この外側Ｉ′Ｗ２２４の合計厚さは多層フィルム
２２０の厚さの約５〜約２０％である。また各充填剤含
有＃２２４は約１５〜約６０重量％の充填剤２２６をそ
の内部に実質的に均一に分散されている。両側の外側層
２２４はフィルム２２０の用途に従って充填剤２２６ま
たは重合体の濃度および型など、同一のまたは相異なる
組成を有する事ができる。
中心ベースＮ２２２はフィルム２２０の厚さの約８０〜
約９５％を占める。もちろん、ベース層２２２はその白
色度または不透明度を増進するために約１〜約１５重量
％の充填剤を含有する事ができるが、この中心ベース層
２２２がそのいずれかの側面に高不透明化顔料濃度の外
側層２２４を備える場合には、ベース層２２２は外側／
ｗ２２４によって隠されて、このベース層２２２に加え
られた顔料の効果は顕著でなくなる。
第３図の多層フィルム２２０においては、例えばブロー
成形の場合のようにエンボスロールを使用する事なく、
外側層２２４の中にシリカなどの充填剤を選択的に含有
する事により、その両方の面がつや消しはだ目を有する
事ができる利点がある。あるいは、それぞれの外側Ｎ２
２４の中に相異なる顔料を含有する事にによって、多層
フィルム２２０の両面の外観を相違させる事ができる。
第２図と第３図に図示の実施例から、２Ｊ’ｌの並置さ
れたベース層と１層の充填剤含有層とを有し、あるいは
２層の並置された充填剤含有層とＩＮのベース層とから
成る３層構造の他の実施態様を容易に製造できる事は明
かである。さらに４Ｊｖ！または４層以上の構造も可能
であり、この場合前記の２層構造または３層構造を組合
せて多層構造を生じる事ができる。しかし、このような
多Ｎ構造の材料特性、不透明度および製造法は本質的に
前記と同様である。
本発明の多層フィルムの非制限的用途（図示されず）の
例はオシメ、成人失禁製品、月経パッドおよびパンティ
ライナである０月経バンドまたはパンティライナを製造
する場合には、本発明の２枚の多層フィルム２０を使用
し、一方のシートを約２５％開放区域まで公知の技術で
アパチュア加工してトップシートとし、他方のシートを
バンクシートとし、各シートが約２０．３ｘ７．８ｃ＋
ｎ　（８インチに３インチ）の寸法を有するようにする
。これらのシートは前記の材料および充填剤の任意の組
合せによって製造する事ができる。シミを隠しまた着用
者に快適に作用する組合せは厚さ約０．０２５＋ａｍ（
０，００１インチ）の多層フィルム２０であって、その
第１ＦＪ２２は約４重量％の二酸化チタン白化剤を分散
された低密度ポリエチレン層であり、第２層２４は、約
２５％のシリカと約２５重量％の二酸化チタンとを内部
に分散されたエチレン−酢酸ビニル共重合体層とする。
ベース層２２は多層フィルム２０の厚さ約９／１０を成
し、充填剤含宥不透明化７Ｗ２４はフイＪレム２０の厚
さの約１／１０を成す、また粉砕パルプまたはティシュ
先締などの吸収性コアは約１７．８ｘ５．１ｘＯ，６ｃ
ｍ（７ｘ２ｘＯ，２５インチ）の両側面を有するものが
使用される。
トップシートとバンクシートを吸収性コアの両側面に整
合配置し、つぎにコアを包囲してトップシートとバック
シートを吸収性コアの両側面に対して固着しまたはその
他の方法で結合する。トップシートとバンクシートの相
互接合によって形成された継目は、この継目が液密性で
ある限り、接合、超音波溶接まは締め付けなど適当な公
知手段を使用して密封される。パンティライナは実質的
に同様して形成されるが、比較的小量の膣排泄物を収容
するために吸収性コアの寸法を減少させる。
従ってトップシートとバンクシートの寸法も減少される
。
前記のように形成された月経パッドまたはパンティライ
ナのアパチュアを有する多層フィルム２０を皮膚の側に
向け、アパチュアを有しないトップシート多層フィルム
２０を衣類の側に向けて衣類の側に２＆！置する。履排
泄物または月経がアパチュアを有するトップシートの上
に排出され、吸収性コアの中に吸取された場合、これら
の排泄物または月経は本発明の不透明フィルムによって
隠される。
排泄物はアパチュアを有しないバックシートによってコ
アの中に保持される。
アパチュアを有するトップシートとアパチュアを有しな
いバンクシートとの間に介在されこれらのシートに固着
されまたその他の方法で結合された吸収性コアから成る
オシメまたは成人用失禁製品は、米国特許１’ｆ３，８
６０，００３号に記載のように着用者のウェストと脚を
包囲するように形成する事ができる。この特許を引例と
して加える。このようなオシメまたは成人失禁製品のト
ップシートとバックシートは本発明の多層フィルムによ
って構成する事ができる。
本発明は前記の説明のみに限定されるものでなく、その
主旨の範囲内において任意に変更実施できる。
【図面の簡単な説明】
ｆＪ１図は１ベ一ス層と１充填剤含有層とを含む本発明
の多層フィルムの第１実施態様の断面図、第２図は２／
Ｗの外側ベース層の中間に１層の充填剤含有層を含む本
発明の多層フィルムの第２実施態様の断面図、また第３
図ｉよ２ｒＩｉの外側充填剤含有層の間に１層の中心ベ
ース層を有する本発明の第３実施態様の断面図である。 ２０．１２０，２２０．、、多層フィルム、２２，１２
２，２２２．、、ベース層、２４，１２４，２２４．、
、充填剤含有層、２６，１２６，２２６゜１．充填剤。 出願人代理人　　佐　　藤　　−雄

Claims (1)

  1. 【特許請求の範囲】 １、（ａ）重合体から成る少なくとも１層のベース層と
    、 （ｂ）約１５乃至約６０重量％の充填剤を内部に実質的
    に均一に分散され、多層フィルムの全厚さの約２０％を
    超えない厚さを有し、前記ベース層に対して実質的に連
    続的に接合された少なくとも１層の充填剤含有重合体層
    とを含む重合体多層フィルム。 ２、（ａ）実質的に重合体から成る第１外側ベース層と
    、 （ｂ）約１５乃至約６０重量％の充填剤を内部に実質的
    に均一に分散され、多層フィルムの全厚さの約２０％を
    超えない厚さを有し、相互に対向する第１側面と第２側
    面を有し、前記第１側面が前記第１外側ベース層の一方
    の側面に対して実質的に連続的に接合された中心充填剤
    含有重合体と、 （ｃ）実質的に重合体から成り、一方の側 面が前記中心充填剤含有層の第２側面に対して実質的に
    連続的に接合された第２外側ベース層とを含む重合体多
    層フィルム。 ３、（ａ）それぞれ約１５乃至約６０重量％の充填剤を
    内部に実質的に均一に分散され、重合体多層フィルムの
    全厚さの約２０％を越えない合計厚さを有する２層の外
    側充填剤含有重合体層と、 （ｂ）相互に対向する第１側面と第２側面 とを有し実質的に重合体から成る中心ベース層であって
    、このベース層は前記の外側充填剤含有重合体層の間に
    介在させられ、前記外側層の一方が前記ベース層の前記
    第１側面に対して実質的に連続的に接合され、他方の外
    側層が前記ベース層の前記第２側面に対して連続的に接
    合された中心ベース層とを含む重合体多層フィルム。 ４、（ａ）第１樹脂重合体含有ペレットと０乃至１５重
    量％の顔料を含有するペレットとを準備する段階と、 （ｂ）実質的に均一な第１混合物が得られ るまで前記重合体含有ペレットと前記０乃至１５重量％
    の顔料含有ペレットとを混合する段階と、（ｃ）第２樹
    脂重合体含有ペレットと約１５乃至約６０重量％の充填
    剤を含有するペレットとを準備する段階と （ｄ）実質的に均一な第２混合物が得られ るまで、前記第２樹脂重合体含有ペレットと前記の約１
    ５乃至約６０重量％の充填剤を含有するペレットとを混
    合する段階と （ｅ）前記第１混合物と前記第２混合物と の約９：１の割合を生じるように構成された少なくとも
    ２個の可塑化押出機を準備する段階と、（ｆ）前記第１
    および第２の均一混合物を 前記可塑化押出機を通して共押出しして、ベース層と充
    填剤含有層とから成る実質的に連続的な重合体多層構造
    を成し、その際に前記ベース層と前記充填剤含有層の厚
    さは、前記可塑化押出機の第１混合物と第２混合物との
    前記比率にだいたい対応する段階と、 （ｇ）前記実質的に連続的な重合体多層構造をダイスか
    ら押出して、実質的に連続的な重合体多層フィルムを形
    成する段階と、 （ｈ）前記実質的に連続的な重合体多層フィルムをこの
    多層フィルムの速度に少なくとも等しい表面速度を有す
    る回転チルロールの上に送り、前記チルロールが前記多
    層フィルムを冷凍させまた多層フィルムの薄化を生じる
    段階とを含む多層フィルムの製造方法。 ５、前記充填剤含有層は、二酸化チタン、炭酸カルシウ
    ム、シリカ、着色顔料、フィラメントおよびその組合せ
    から成るグループから選定された充填剤を含む事を特徴
    とする請求項１、２または３のいずれかに記載の多層フ
    ィルム。 ６、前記充填剤含有層は、ポリオレフィン、少なくとも
    一つのオレフィン成分を有する共重合体、ポリエステル
    、ナイロン、ポリエステルとナイロンの共重合体および
    その組合せから成るグループから選定された重合体を含
    む事を特徴とする請求項１、２または３のいずれかに記
    載の多層フィルム。 ７、前記ベース層はさらに約１乃至１５％の充填剤を含
    む事を特徴とする請求項１、２または３のいずれかに記
    載の多層フィルム。 ８、前記充填剤含有層は前記多層フィルムの厚さの約５
    乃至約２０％の厚さを有する事を特徴とする請求項１、
    ２または３のいずれかに記載の多層フィルム。 ９、前記多層フィルムの少なくとも一方の側面が白色で
    ある事を特徴とする請求項１、２または３のいずれかに
    記載の多層フィルム。 １０、さらにアパチュアを含む事を特徴とする請求項１
    、２または３のいずれかに記載の多層フィルム。
JP1162483A 1988-06-23 1989-06-23 多層重合体フイルム Expired - Fee Related JP2950852B2 (ja)

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US07/211,518 US5006394A (en) 1988-06-23 1988-06-23 Multilayer polymeric film
US211518 1998-12-14

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JPH02243336A true JPH02243336A (ja) 1990-09-27
JP2950852B2 JP2950852B2 (ja) 1999-09-20

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KR (1) KR960010135B1 (ja)
AT (1) ATE125489T1 (ja)
CA (1) CA1319480C (ja)
DE (1) DE68923587T3 (ja)
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EP0347745B1 (en) 1995-07-26
US5006394A (en) 1991-04-09
JP2950852B2 (ja) 1999-09-20
MX169827B (es) 1993-07-27
DE68923587T3 (de) 1999-12-16
EP0347745B2 (en) 1999-07-21
GR3030841T3 (en) 1999-11-30
KR960010135B1 (ko) 1996-07-26
KR900000195A (ko) 1990-01-30
DE68923587D1 (de) 1995-08-31
DE68923587T2 (de) 1996-01-18
ATE125489T1 (de) 1995-08-15
EP0347745A2 (en) 1989-12-27
ES2075013T5 (es) 1999-10-16
CA1319480C (en) 1993-06-29
ES2075013T3 (es) 1995-10-01
EP0347745A3 (en) 1990-12-05

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