JP2019512412A - 酸素バリア膜及び積層体及びそれらを製造する方法 - Google Patents
酸素バリア膜及び積層体及びそれらを製造する方法 Download PDFInfo
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- JP2019512412A JP2019512412A JP2018549871A JP2018549871A JP2019512412A JP 2019512412 A JP2019512412 A JP 2019512412A JP 2018549871 A JP2018549871 A JP 2018549871A JP 2018549871 A JP2018549871 A JP 2018549871A JP 2019512412 A JP2019512412 A JP 2019512412A
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- Prior art keywords
- membrane
- layer
- mfc
- oxygen barrier
- laminate
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Abstract
Description
酸素に対して高程度に不浸透性である材料の層である酸素バリアを提供するために従来使用されてきた特定のポリマーが存在する。そのようなポリマーの例は、エチルビニルアルコールコポリマー(EVOH)、ポリアミド(PA)、ポリビニルアルコールコポリマー(PVOH)及びポリ塩化ビニル(PVC)である。
こうして、暑い熱帯性気候などの特に高度に多湿の条件において酸素バリアを改善する新しいMFC膜ベースの解決の余地が存在する。本発明による新規な繊維ベースの酸素バリア膜は、
(i)ミクロフィブリル化セルロース(MFC)膜、
(ii)酸素バリアポリマー層、
(iii)場合による接続層、及び
(iv)最も外側のポリオレフィン層、
を含み、前記酸素バリアポリマー及びポリオレフィン層(ii、iv)が、MFC膜(i)上への共押出によってもたらされたものである。
(i)繊維質の紙又はボード基材、
(ii)ポリエチレン(PE)層、
(iii)ミクロフィブリル化セルロース(MFC)膜、
(iv)酸素バリアポリマー層、
(v)場合による接続層、及び
(vi)最も外側のポリオレフィン層、
を含む。
ミクロフィブリル化セルロース(MFC)は、本特許出願の内容においては、100nm未満の少なくとも1つの寸法を持つナノスケールのセルロース粒子繊維又はフィブリルを意味する。MFCは、部分的に又は全体的にフィブリル化されたセルロース又はリグノセルロース繊維を含む。実際のフィブリル直径又は粒子サイズ分布及び/又はアスペクト比(長さ/幅)は、供給源及び製造方法に依存するのに対して、解放されたフィブリルは、100nm未満の直径を有する。最も小さいフィブリルは、基本フィブリルと呼ばれ、そして、約2−4nmの直径を有する(例えば、Chinga-Carrasco, G., Cellulose fibres, nanofibrils and microfibrils,: The morphological sequence of MFC components from a plant physiology and fibre technology point of view, Nanoscale research letters 2011, 6:417を参照)。その一方で、ミクロフィブリルとしても定義される基本フィブリルの凝集形(Fengel, D., Ultrastructural behavior of cell wall polysaccharides, Tappi J., March 1970, Vol 53, No. 3.)は、例えば拡張精製プロセス又は圧力低下粉砕プロセスを使用することによってMFCを製造する際に得られる主要製品であることが普通である。供給源及び製造プロセスに依存して、フィブリルの長さは、約1〜10マイクロメートルよりも大きく変化し得る。粗粒度MFCは、フィブリル化された繊維の実質的な部分、すなわち、仮導管(セルロース繊維)から突き出ているフィブリル及び仮導管(セルロース繊維)から解放されたある量のフィブリルを、含有できる。
構造(i)15g/m2のLDPE層、(ii)70g/m2の紙層(「Lumiflex 70」)、(iii)12g/m2のLDPE層、(iv)30g/m2のMFC膜層、(v)6g/m2のEVOH層、(vi)5g/m2のエチレンコポリマー接続層、及び(vii)45g/m2のLDPE層で、第1の多層積層体が調製された。
Claims (16)
- (i)ミクロフィブリル化セルロース(MFC)膜、
(ii)酸素バリアポリマー層、
(iii)場合による接続層、及び
(iv)最も外側のポリオレフィン層、
を含む繊維ベースの酸素バリア膜であって、前記酸素バリアポリマー及びポリオレフィン層が、MFC膜上への共押出によってもたらされた、前記の繊維ベースの酸素バリア膜。 - 前記酸素バリアポリマーが、エチルビニルアルコールコポリマー(EVOH)、ポリアミド(PA)、ポリビニルアルコールコポリマー(PVOH)及びポリ塩化ビニル(PVC)から成る群から選択されることを特徴とする、請求項1の膜。
- 前記酸素バリアポリマーがEVOHであることを特徴とする、請求項2の膜。
- 前記ポリオレフィンがポリエチレン(PE)であることを特徴とする、前記請求項のいずれか1項の膜。
- MFC膜が、20〜40g/m2の重量のあらかじめ作られたMFC膜であることを特徴とする、前記請求項のいずれか1項の膜。
- MFC膜が、50%相対湿度で、50ml/m2より上、好ましくは100〜8000ml/m2の範囲の酸素透過率(OTR)(ASTM D3985−05)を有することを特徴とする、前記請求項のいずれか1項の膜。
- MFC膜の裏面上に押出ポリオレフィン層が存在することを特徴とする、前記請求項のいずれか1項の膜。
- 前記請求項のいずれか1項の膜を含む積層体であって、前記積層体が、
(i)繊維質の紙又はボード基材、
(ii)ポリエチレン(PE)層、
(iii)ミクロフィブリル化セルロース(MFC)膜、
(iv)酸素バリアポリマー層、
(v)場合による接続層、及び
(vi)最も外側のポリオレフィン層、
を含み、
しかも、前記酸素バリアポリマー及びポリオレフィン層が、MFC膜上への共押出によってもたらされた、前記積層体。 - 繊維質の紙又はボード基材の裏面に、ヒートシール可能なポリオレフィン層が提供されることを特徴とする、請求項8の積層体。
- 繊維質の基材(i)が、130〜250g/m2、好ましくは200〜250g/m2の重量の板紙を含むことを特徴とする、請求項8又は9の積層体。
- 繊維質の基材(i)が、40〜130g/m2の重量の紙を含むことを特徴とする、請求項8又は9の積層体。
- 酸素バリアポリマー層、最終的な接続層及びポリオレフィン層が、MFC膜の上に共押出されることを特徴とする、請求項1〜7のいずれか1項の膜を製造する方法。
- EVOH、接続層及びポリエチレン又はポリプロピレン層が、MFC膜の上に共押出されることを特徴とする、請求項12の方法。
- 請求項1〜7のいずれか1項に従って得られる膜が、PE層で被覆された紙又はボード基材に乾式積層されることを特徴とする、請求項8〜11のいずれか1項の積層体を製造する方法。
- 高湿度条件を受ける密封された食品包装用の、請求項8〜11のいずれか1項の積層体又は請求項1〜7のいずれか1項の当該膜の使用。
- 乾燥食品包装用の、請求項15に記載の使用。
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SE1650380A SE539754C2 (en) | 2016-03-22 | 2016-03-22 | Oxygen barrier film and laminate and methods of manufacturing the same |
PCT/IB2017/051597 WO2017163167A1 (en) | 2016-03-22 | 2017-03-20 | Oxygen barrier film and laminate and methods of manufacturing the same |
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BR102020015501A2 (pt) | 2020-07-29 | 2022-02-08 | Suzano S.A. | Composição de barreira compreendendo amido, plastificante e mfc, método de produção, estrutura multicamada, e estrutura impermeável a o2 |
SE546122C2 (en) * | 2022-07-07 | 2024-05-28 | Stora Enso Oyj | Paper or paperboard based packaging laminate having a gas barrier with an extruded evoh layer |
SE545928C2 (en) * | 2022-07-08 | 2024-03-19 | Stora Enso Oyj | A method for producing a barrier substrate comprising a microfibrillated cellulose film and a polymer film |
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US11084261B2 (en) | 2021-08-10 |
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