JP2019001165A - 積層体、及びエアバッグ - Google Patents
積層体、及びエアバッグ Download PDFInfo
- Publication number
- JP2019001165A JP2019001165A JP2018114711A JP2018114711A JP2019001165A JP 2019001165 A JP2019001165 A JP 2019001165A JP 2018114711 A JP2018114711 A JP 2018114711A JP 2018114711 A JP2018114711 A JP 2018114711A JP 2019001165 A JP2019001165 A JP 2019001165A
- Authority
- JP
- Japan
- Prior art keywords
- base fabric
- adhesive layer
- layer
- multilayer film
- laminate
- 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
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Images
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Abstract
【解決手段】基布と熱可塑性フィルムとを含む積層体であって、前記熱可塑性フィルムが、熱可塑性ポリエステル系エラストマーを含む接着層と、当該接着層に接合され、当該接着層の融点よりも高い融点を有し、ポリマーを含む気密層とを有する多層フィルムであり、前記基布がポリエステルを含み、当該基布の目付が190g/m2以下である。
【選択図】図1
Description
図1に、本形態の積層体において用いられる熱可塑性フィルム1の模式的な断面図を示す。図1に示すように、熱可塑性フィルム1は多層フィルムであって、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。接着層3は熱可塑性ポリエステル系エラストマーを含み、気密層2はポリマーを含み、気密層2の融点は接着層3の融点よりも高くなっている。
接着層は、熱可塑性エラストマー、具体的には熱可塑性ポリエステル系エラストマーを含む。熱可塑性エラストマーは、ハードセグメント(高融点セグメント、結晶性セグメントともいう)と、ソフトセグメント(低融点セグメント、非結晶性セグメントともいう)とを含むブロック共重合体であることが好ましい。熱可塑性エラストマーは、熱により軟化して流動性を示し、熱を加えてない状態ではゴム様の弾性を示すことができる。
気密層は、ポリマーを含み、好ましくは熱可塑性ポリマーを含む。また、得られる積層体の弾性や機械的強度を向上させる観点から、気密層は、ポリエステル系、ポリアミド系、ポリオレフィン系、ポリウレタン系、ポリスチレン系、ポリブタジエン系の熱可塑性エラストマーを含むことが好ましく、中でも、熱可塑性ポリエステル系エラストマーを含むことが好ましい。気密層が熱可塑性ポリエステル系エラストマー含む場合には、接着層における熱可塑性ポリエステル系エラストマーについて説明したものから選択して使用することができる。
上述のように、熱可塑性フィルム(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。
多層フィルムは、接着層と気密層とを接合させることによって製造することができる。その場合、予め、接着層及び気密層をそれぞれ別個のシート又はフィルムとして、押出成形等により成形しておき、互いを接合させて一体化させることができる。例えば、各シート又はフィルムを重ねて熱プレス又は熱ロールによって溶融圧着する方法、成形されたシート又はフィルム上に溶融した材料を押し出す押出ラミネート法等が挙げられる。
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。
本発明の一形態による積層体は、上述の多層フィルムを、接着層が基布と接するようにして基布に重ね合せ、その後、所定温度で加熱しながら、例えば、一対の加圧ローラの間を通過させることにより製造することができる。
本形態の方法によって製造される積層体は、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。
<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積層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)、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22本/cm、緯糸15本/cmであった。基布の目付は180g/m2であった。
(多層フィルム)
実施例1と同様にして、3層フィルムを作製した。
基布を変更した以外は実施例1と同様にして、基布と多層フィルムとの積層体を作製した。実施例2で用いた基布は、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であり、経糸及び緯糸の総繊度はいずれも470dtexであったが、織り密度は、経糸15本/cm、緯糸15本/cmであり、基布の目付は150g/m2であった。実施例1と同様に評価を行った。結果を表1に示す。
(多層フィルム)
実施例1と同様にして、3層フィルムを作製した。
基布を変更した以外は実施例1と同様にして、基布と多層フィルムとの積層体を作製した。実施例3で用いた基布は、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であり、経糸及び緯糸の総繊度はいずれも470dtexであったが、織り密度は、経糸10本/cm、緯糸10本/cmであり、基布の目付は95g/m2であった。実施例1と同様に評価を行った。結果を表1に示す。
(多層フィルム)
実施例1と同様にして、3層フィルムを作製した。
基布を変更した以外は実施例1と同様にして、基布と多層フィルムとの積層体を作製した。比較例1で用いた基布は、経糸及び緯糸の総繊維度はいずれも470dtexであったが、ナイロン製の繊維で織られた平織基布であり、織り密度は、経糸22本/cm、緯糸19本/cmであり、基布の目付は220g/m2であった。実施例1と同様に評価を行った。結果を表1に示す。
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 (6)
- 基布と熱可塑性フィルムとを含む積層体であって、
前記熱可塑性フィルムが、熱可塑性ポリエステル系エラストマーを含む接着層と、当該接着層に接合され、当該接着層の融点よりも高い融点を有し、ポリマーを含む気密層とを有する多層フィルムであり、
前記基布がポリエステルを含み、当該基布の目付が190g/m2以下である、積層体。 - 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に記載の積層体。
- 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、請求項1又は2に記載の積層体。
- 前記基布がエアバッグ用基布である、請求項1から3のいずれか一項に記載の積層体。
- 前記気密層の融点が、前記接着層の融点よりも20℃を超えて高い、請求項1から4のいずれか一項に記載の積層体。
- 請求項1から5のいずれか一項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。
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- 2018-06-15 CN CN201880039594.3A patent/CN110958942A/zh active Pending
- 2018-06-15 KR KR1020197036769A patent/KR102309760B1/ko active IP Right Grant
- 2018-06-15 EP EP18816514.6A patent/EP3640023B1/en active Active
- 2018-06-15 JP JP2018114711A patent/JP7236820B2/ja active Active
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EP3640023A4 (en) | 2020-07-08 |
KR20200016257A (ko) | 2020-02-14 |
US20200122441A1 (en) | 2020-04-23 |
CA3067205A1 (en) | 2018-12-20 |
JP7236820B2 (ja) | 2023-03-10 |
WO2018230724A1 (ja) | 2018-12-20 |
CN110958942A (zh) | 2020-04-03 |
EP3640023A1 (en) | 2020-04-22 |
US11192345B2 (en) | 2021-12-07 |
KR102309760B1 (ko) | 2021-10-12 |
EP3640023B1 (en) | 2023-10-18 |
MX2019014948A (es) | 2020-08-06 |
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