JP6898276B2 - 多層フィルム、積層体、エアバッグ、及び積層体の製造方法 - Google Patents
多層フィルム、積層体、エアバッグ、及び積層体の製造方法 Download PDFInfo
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- JP6898276B2 JP6898276B2 JP2018114709A JP2018114709A JP6898276B2 JP 6898276 B2 JP6898276 B2 JP 6898276B2 JP 2018114709 A JP2018114709 A JP 2018114709A JP 2018114709 A JP2018114709 A JP 2018114709A JP 6898276 B2 JP6898276 B2 JP 6898276B2
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- multilayer film
- adhesive layer
- base cloth
- layer
- elastomer
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Description
図1に、多層フィルム1の模式的な断面図を示す。本発明の一態様は、図1に示すように、多層フィルム1であって、気密層2と、この気密層2に接合されている接着層3とを有する。当該多層フィルム1は、基布に接着させて使用されるものであり、接着層3は、基布に接着される側となる。
接着層は、熱可塑性ポリエステル系エラストマーと、ショアD硬度80未満のポリマーとを含む。この組成により、得られる積層体の耐層間剥離性を、低コストで向上させることができる。すなわち、接着層と基布との接着性及び接着層と気密層との接着性を、常温においても、高温及び/又は高湿の条件下でも向上させることができる。また、積層体全体の柔軟性や機械的強度をバランス良く向上させることができる。
気密層を構成する材料は、特に限定されないが、熱可塑性エラストマーを用いることが好ましい。熱可塑性エラストマーとしては、ポリアミド系エラストマー、ポリオレフィン系エラストマー、ポリウレタン系エラストマー、ポリスチレン系エラストマー、ポリブタジエン系エラストマー等が挙げられる。上記のうち、接着層に含まれる熱可塑性エラストマーと同系のエラストマーであること等から、気密層にも熱可塑性ポリエステル系エラストマーを用いることが好ましい。気密層及び接着層の両層にポリエステル系のエラストマーが含まれていることで、接着層と気密層との接着性(耐層間剥離性)を、常温においても、高温及び/又は高湿の条件下においても向上させることができる。
上述のように、多層フィルムは、気密層と接着層とを有している。接着層は、1層であってもよいし複数であってもよい。接着層が複数ある場合には、各接着層を構成する材料は、同じであってもよく、異なっていてもよい。また、複数の接着層の各層の融点は、同じであってもよいし異なっていてもよい。気密層も、同様に、1層であってもよいし、複数であってもよい。気密層が複数ある場合には、各気密層を構成する材料及び融点もそれぞれ、同じであってもよいし異なっていてもよい。
本形態による多層フィルムは、基布に接着させて使用するものである。本明細書において、基布とは、多層フィルムと基布との積層により得られる、最終製品である積層体の強度を確保するための支持体として機能するシート状の構造体である。ここで、シート状とは、平面状の他、筒状、袋状、風船状に形成された形状も含む。
図2に、本発明の一形態による積層体の模式的な断面図を示す。積層体5は、上述した気密層2と接着層3とを備えた多層フィルム1と、基布4とが互いに接着されて構成されている。
本発明の一形態は、上述の多層フィルムと、基布とを有する積層体の製造方法であって、気密層の融点を下回る温度で加熱しながら、多層フィルムを接着層の側で基布に接着させる工程を含む。
本形態による多層フィルム及び積層体は、車両用エアバッグ、アウトドア用品、包装用途等において好適に用いられ、特に車両用エアバッグ、とりわけカーテンエアバッグの製造に好適に用いられる。カーテンエアバッグとは、サイドウインドウ上部のルーフライン等に取り付けられており、衝突時等に高荷重が作用した場合に、サイドウインドウに沿わせて鉛直下方にカーテン状に展開させるエアバッグを指す。
多層フィルムの原料として、以下のものを使用した。なお、各原料の融点は、示差走査熱量計で測定された融解ピーク温度である。
熱可塑性ポリエステル系エラストマー(PTEE−1):ポリブチレンテレフタレートをハードセグメントとし、数平均分子量2000のポリテトラメチレンエーテルグリコールをソフトセグメントとする、ポリエステル−ポリエーテルブロック共重合体。上記共重合体中、ポリブチレンテレフタレートの含有割合が28重量%であり、ポリテトラメチレンエーテルグリコールセグメントの含有割合が72重量%である(融点160℃)
エチレン−酢酸ビニル共重合体(EVA):「Evatan(登録商標)2805」アルケマ株式会社製、ショアD硬度15〜40
ポリエチレン(PE):「PG7004」ダウケミカル社製(低密度ポリエチレン)、ショアD硬度45〜55
水添スチレン系熱可塑性エラストマー(SEBS):「タフテック」旭化成株式会社製、ショアA硬度40以下(ショアD硬度約8以下に相当)
エチレン‐ブチルアクリレート共重合樹脂(EBA):「Elvaoly」Du Pont社製、ショアD硬度30〜50
ポリメタクリル酸メチル樹脂:「アクリペット」三菱レイヨン株式会社製、ショアD硬度80〜100
<高温高湿接着性(高温高湿下での耐層間剥離性)>
多層フィルムと基布とを後述のように接着させて得られた積層体から、50mm×150mmの試験片を作製し、この試験片を密閉容器内に入れ、容器内の条件を温度70℃、相対湿度95%にして408時間にわたり保った。容器から取り出した試験片(積層体)の基布の部分を固定しつつ、多層フィルムの部分(気密層及び接着層)を180°方向に引張速度100mm/分で引きはがした際に要した力を剥離力(N/mm)として測定した。評価基準は以下の通りである。
〇:剥離力が0.5N/mm超であった。
△:剥離力が0.3〜0.5N/mmであった。
×:剥離力が0.3N/mm未満であった、又は多層フィルム内で層間剥離が生じた。
(多層フィルム)
3つの押出機を有するインフレーション押出装置(Dr Collin社製)を用いて多層フィルムの製造を行った。各押出機にそれぞれ、熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とエチレン−酢酸ビニル共重合体(EVA)30重量%との混合物、熱可塑性ポリエステル系エラストマー(PTEE−1)、及び熱可塑性ポリエステル系エラストマー(PTEE−2)を投入し、各原料の融点以上で溶融し、インフレーション法にて3層フィルムを作製した。
基布として、ポリエチレンテレフタレート製の繊維で織られた平織基布を使用した。経糸及び緯糸の総繊度はいずれも470dtexであり、織り密度は、経糸及び緯糸それぞれ22本/cmであった。
(多層フィルム)
熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とエチレン−酢酸ビニル共重合体(EVA)と30重量%との混合物に代えて、熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とポリエチレン(PE)30重量%との混合物を用いたこと以外は、実施例1と同様にして3層フィルムを作製した。得られたフィルムは、熱可塑性ポリエステル系エラストマー(PTEE−1)とポリエチレン(PE)とからなる第1の接着層、熱可塑性ポリエステル系エラストマー(PTEE−1)からなる第2の接着層、及び熱可塑性ポリエステル系エラストマー(PTEE−2)からなる気密層が、この順に積層された3層フィルムであった。
実施例1と同様にして、基布と多層フィルムの積層体を作製し、評価を行った。結果を表1に示す。
熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とエチレン−酢酸ビニル共重合体(EVA)と30重量%との混合物に代えて、熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%と、ポリエチレン(PE)15重量%と、水添スチレン系熱可塑性エラストマー(SEBS)15重量%との混合物を用いたこと以外は、実施例1と同様にして3層フィルムを作製した。得られたフィルムは、熱可塑性ポリエステル系エラストマー(PTEE−1)とポリエチレン(PE)と水添スチレン系熱可塑性エラストマー(SEBS)とからなる第1の接着層、熱可塑性ポリエステル系エラストマー(PTEE−1)からなる第2の接着層、及び熱可塑性ポリエステル系エラストマー(PTEE−2)からなる気密層が、この順に積層された3層フィルムであった。
実施例1と同様にして、基布と多層フィルムの積層体を作製し、評価を行った。結果を表1に示す。
熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とエチレン−酢酸ビニル共重合体(EVA)と30重量%との混合物に代えて、熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%と、水添スチレン系熱可塑性エラストマー(SEBS)30重量%との混合物を用いたこと以外は、実施例1と同様にして3層フィルムを作製した。得られたフィルムは、熱可塑性ポリエステル系エラストマー(PTEE−1)と水添スチレン系熱可塑性エラストマー(SEBS)とからなる第1の接着層、熱可塑性ポリエステル系エラストマー(PTEE−1)からなる第2の接着層、及び熱可塑性ポリエステル系エラストマー(PTEE−2)からなる気密層が、この順に積層された3層フィルムであった。
実施例1と同様にして、基布と多層フィルムの積層体を作製し、評価を行った。結果を表1に示す。
熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とエチレン−酢酸ビニル共重合体(EVA)と30重量%との混合物に代えて、熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%と、エチレン−ブチルアクリレート共重合樹脂(EBA)30重量%との混合物を用いたこと以外は、実施例1と同様にして3層フィルムを作製した。得られたフィルムは、熱可塑性ポリエステル系エラストマー(PTEE−1)とエチレン−ブチルアクリレート共重合樹脂(EBA)とからなる第1の接着層、熱可塑性ポリエステル系エラストマー(PTEE−1)からなる第2の接着層、及び熱可塑性ポリエステル系エラストマー(PTEE−2)からなる気密層が、この順に積層された3層フィルムであった。
実施例1と同様にして、基布と多層フィルムの積層体を作製し、評価を行った。結果を表1に示す。
(多層フィルム)
熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とエチレン−酢酸ビニル共重合体(EVA)30重量%との混合物に代えて、熱可塑性ポリエステル系エラストマー(PTEE−1)100重量%を用いた以外は、実施例1と同様にして3層フィルムを作製した。得られたフィルムは、熱可塑性ポリエステル系エラストマー(PTEE−1)からなる第1の接着層、熱可塑性ポリエステル系エラストマー(PTEE−1)からなる第2の接着層、及び熱可塑性ポリエステル系エラストマー(PTEE−2)からなる気密層が、この順に積層された3層フィルムであった。
実施例1と同様にして、基布と多層フィルムの積層体を作製し、評価を行った。結果を表1に示す。
(多層フィルム)
熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とエチレン−酢酸ビニル共重合体(EVA)30重量%との混合物に代えて、エチレン−酢酸ビニル共重合体(EVA)100重量%を用いた以外は、実施例1と同様にして3層フィルムを作製した。得られたフィルムは、エチレン−酢酸ビニル共重合体(EVA)からなる第1の接着層、エチレン−酢酸ビニル共重合体(EVA)からなる第2の接着層、及び熱可塑性ポリエステル系エラストマー(PTEE−2)からなる気密層が、この順に積層された3層フィルムであった。
実施例1と同様にして、基布と多層フィルムの積層体を作製し、評価を行った。結果を表1に示す。
(多層フィルム)
熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とエチレン−酢酸ビニル共重合体(EVA)30重量5との混合物に代えて、熱可塑性ポリエステル系エラストマー(PTEE−1)70重量%とポリメタクリル酸メチル樹脂(PMMA)30重量%との混合物を用いた以外は、実施例1と同様にして3層フィルムを作製した。得られたフィルムは、熱可塑性ポリエステル系エラストマー(PTEE−1)とポリメタクリル酸メチル樹脂(PMMA)とからなる第1の接着層、エチレン−酢酸ビニル共重合体(EVA)からなる第2の接着層、及び熱可塑性ポリエステル系エラストマー(PTEE−2)からなる気密層が、この順に積層された3層フィルムであった。
実施例1と同様にして、基布と多層フィルムの積層体を作製し、評価を行った。結果を表1に示す。
(付記1)
基布に接着して使用される多層フィルムであって、
前記基布に接着される側となる接着層と、当該接着層に接合されている気密層とを有し、
前記接着層が、熱可塑性ポリエステル系エラストマーと、エチレン−酢酸ビニル共重合体とを含む、多層フィルム。
(付記2)
前記気密層の融点が、前記接着層の融点よりも高い、付記1に記載の多層フィルム。
(付記3)
前記接着層中の熱可塑性ポリエステル系エラストマーが、ポリエーテルを含むソフトセグメントと、ポリエステルを含むハードセグメントとを含むブロック共重合体である、付記1又は2に記載の多層フィルム。
(付記4)
前記気密層が、熱可塑性ポリエステル系エラストマーを含む、付記1から3のいずれかに記載の多層フィルム。
(付記5)
前記基布がポリエステルを含む、付記1から4のいずれかに記載の多層フィルム。
(付記6)
前記基布がエアバッグ用基布である、付記1から5のいずれかに記載の多層フィルム。
(付記7)
付記1から6のいずれか一項に記載の多層フィルムと、基布とが接着されてなる、積層体。
(付記8)
付記7に記載の積層体を用いてなるエアバッグであって、
前記基布が袋状に形成されており、前記基布の表面に前記多層フィルムが形成されている、エアバッグ。
(付記9)
付記1から6のいずれかに記載の多層フィルムと、基布とを有する積層体の製造方法であって、
前記気密層の融点を下回る温度で加熱しながら、前記多層フィルムを前記接着層の側で前記基布に接着させる工程を含む、製造方法。
2、2a、2b 気密層
3、3a、3b 接着層
4 基布
5 積層体
6 積層体(エアバッグ)
20 積層体製造装置
22 加熱部
24 冷却部
Claims (9)
- 基布に接着して使用される多層フィルムであって、
前記基布に接着される側となる接着層と、当該接着層に接合されている気密層とを有し、
前記接着層が2層であり、且つ熱可塑性ポリエステル系エラストマーとショアD硬度80未満のポリマーとを含み、
前記気密層が、熱可塑性ポリエステル系エラストマーを含む、多層フィルム。 - 前記ショアD硬度80未満のポリマーが、エチレン−酢酸ビニル共重合体、ポリエチレン、水添スチレン系熱可塑性エラストマー、エチレン−ブチルアクリレート共重合体のうち1種以上である、請求項1に記載の多層フィルム。
- 前記気密層の融点が、前記接着層の融点よりも高い、請求項1又は2に記載の多層フィルム。
- 前記接着層中の熱可塑性ポリエステル系エラストマーが、ポリエーテルを含むソフトセグメントと、ポリエステルを含むハードセグメントとを含むブロック共重合体である、請求項1から3のいずれか一項に記載の多層フィルム。
- 前記基布がポリエステルを含む、請求項1から4のいずれか一項に記載の多層フィルム。
- 前記基布がエアバッグ用基布である、請求項1から5のいずれか一項に記載の多層フィルム。
- 請求項1から6のいずれか一項に記載の多層フィルムと、基布とが接着されてなる、積層体。
- 請求項7に記載の積層体を用いてなるエアバッグであって、
前記基布が袋状に形成されており、前記基布の表面に前記多層フィルムが形成されている、エアバッグ。 - 請求項1から6のいずれか一項に記載の多層フィルムと、基布とを有する積層体の製造方法であって、
前記気密層の融点を下回る温度で加熱しながら、前記多層フィルムを前記接着層の側で前記基布に接着させる工程を含む、製造方法。
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EP3640026A1 (en) | 2020-04-22 |
EP3640026B1 (en) | 2022-07-27 |
US20200114631A1 (en) | 2020-04-16 |
CN110944842A (zh) | 2020-03-31 |
JP2019001163A (ja) | 2019-01-10 |
MX2019014946A (es) | 2020-08-06 |
CN110944842B (zh) | 2022-10-25 |
WO2018230722A1 (ja) | 2018-12-20 |
CA3067202A1 (en) | 2018-12-20 |
KR102288992B1 (ko) | 2021-08-12 |
KR20200017410A (ko) | 2020-02-18 |
US11072152B2 (en) | 2021-07-27 |
EP3640026A4 (en) | 2020-07-08 |
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