JP2012521902A - 高金属接着性および高バリアー性を有する二軸配向金属化ポリ乳酸フィルム - Google Patents
高金属接着性および高バリアー性を有する二軸配向金属化ポリ乳酸フィルム Download PDFInfo
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- JP2012521902A JP2012521902A JP2012502253A JP2012502253A JP2012521902A JP 2012521902 A JP2012521902 A JP 2012521902A JP 2012502253 A JP2012502253 A JP 2012502253A JP 2012502253 A JP2012502253 A JP 2012502253A JP 2012521902 A JP2012521902 A JP 2012521902A
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- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】該フィルムは、結晶性のポリ乳酸ベースポリマーからなるコア層、本質的にアモルファスのポリ乳酸ベースポリマーからなる第一のスキン層、その第一のスキン層上にある金属層を含む。該フィルムは、本質的にアモルファスのポリ乳酸ベースポリマーからなる第二のスキン層を含んでもよい。
【選択図】なし
Description
たとえば、積層品に、印刷適性、透明性・無光沢性の外観、スリップ性などを付与し、ガス・湿気バリアー性を有する有機・無機塗料のコーティングに適した表面を与え、またバッグの成形用・封止用に適したヒートシール可能層や、塗装・積層による接着剤への被着性に適した層を形成することが可能である。
この形態において、BOPLAフィルムを用いた成分は、従来の石油化学系樹脂やフィルムに頼ることなく望ましい性能を付与できると考えられる。
したがって、BOPLAフィルムには、商業的に売れる費用効果の高い包装製品を製造可能とするべく、より高い機能性が要求されている。BOPLAフィルムは、単体シートとして、良好なガスバリアー性やヒートシール性など多様な機能を有する必要がある。高バリアー性包装材に関する重要な問題点として、BOPLAの不良な防湿バリアー性がある。PLAの有極性が、良好な防湿バリアー性の達成に対する障害になることが多いのである。いかなる理論によるものでないが、水分子(それ自身が極性を持っている)は、非極性のポリマーフィルムよりも極性のポリマーフィルム内部において、より容易に移動できるのではないかと考えられる。さらに、単純型結晶性BOPLAフィルムを用いると、ヒートシーリングやバッグ製造などの下流側における加工プロセスにおいて、PLAポリマー自体の低耐衝撃性、低熱抵抗性および低成形性のほか、二軸配向プロセスから生じる表面結晶性の上昇により困難が生じる。
たとえば、米国特許第6,713,175号明細書では、延伸安定性とともにヒートシール性を持つ単層BOPLAフィルムが開示され、そのポリマーは特異な貯蔵弾性率を有している。また米国特許第6,153,276号明細書では、ヒートシール性を持つPLAからなり、アモルファスのPLA層と結晶性のPLA基層を有するポリマーラミネートが開示されている。WIPO国際公開第2008/020726号は、B/AおよびB/A/Bの層構造を持つヒートシール性BOPLAフィルムを開示している。また日本国特許出願特開2004−358721号公報でも、油剤などの潤滑剤を含有するヒートシール性のPLAスキン層をコア層上に形成したPLAフィルムが記載されている。
モード:STYLUS、ROUGHNESS P−Mode、Y−Scan
触針直径:0.5μm
加重:10mg
カットオフ値:50μm
X−Scanスピード:20μm/sec
X−Scanピッチ:1μm
測定長さ:500μm
Y−Scanライン数:41
Y−Scanピッチ:5μm
ゲイン:1
スロープComp:オフ
基準面積:0.1mm2 、(測定面積:0.102mm2 )
レベル5:平面性の歪曲は観測されなかった。
レベル4:微少な凸凹または平面性の歪曲が観測されたが、下流側の加工ではまったく問題が発生しなかった。
レベル3:明らかな凸凹または平面性の歪曲が観測された。ウェブ損傷など、下流側の加工での重大な問題は発生しなかったが、良好な顧客向けロールとみなせるものではなかった。
レベル2:非常に深刻な凸凹または平面性の歪曲が観測された。下流側の加工を行うことは非情に困難である。
レベル1:平面性が低いことによる穴やフィルムの損傷が観測された。下流側の加工を行うための巻き取り可能なウェブを得ることができなかった。
しかし、このようなポリオレフィンフィルムは、それ自体が高い防湿バリアー性を有しているため、金属化PLAフィルムの正しいMVTR数を適切に評価することはできないことが多い。そのため、80gaのPLAフィルムを保護フィルムとして使用した。PLA保護フィルム自体が非常に大きいMVTR値(>10g/m2 /day)を持っている限り、PLA保護フィルムの種類に制限はない。)PLA保護フィルムの粘着剤側を実施例用フィルムの金属化側に接着するには、エアーポケット、気泡、しわなどを防ぐためにゴム製のローラーを用いるのがよい。ガスバリアー層側を湿気ガス流側に向ける。
材料
結晶性のポリ乳酸、PLA4032D(Natureworks社製)、相対的粘度4.0、1.4mol%D
アモルファスのポリ乳酸、PLA4060D(Natureworks社製)、相対的粘度3.5、12.0mol%D
ケイ酸アルミニウム粒子、シルトンJC−20(水澤化学工業製)、平均サイズは2μm
ケイ酸アルミニウム粒子、シルトンJC−30(水澤化学工業製)、平均サイズは3μm
ケイ酸アルミニウム粒子、シルトンJC−40(水澤化学工業製)、平均サイズは4μm
ケイ酸アルミニウム粒子、シルトンAMT−08L(水澤化学工業製)、平均サイズは0.9μm
シリコーン粒子、トスパール120(東芝シリコーン製)、平均サイズは2μm
シリカスラリー、シリシア310(富士シリシア製)、平均サイズは2.5μm
実施例1a、1b、1e〜1iおよび比較例1c、1d
実施例2a〜2i
実施例3a〜3d
実施例4aおよび4b
実施例5
Claims (31)
- ポリ乳酸ベースポリマーからなるコア層と、本質的にアモルファスのポリ乳酸ベースポリマーからなる第一のスキン層と、該第一のスキン層上にある金属層とからなる多層フィルム。
- 前記コア層が結晶性のポリ乳酸ベースポリマーからなる請求項1記載の多層フィルム。
- 本質的にアモルファスのポリ乳酸ベースポリマーからなる第二のスキン層をさらに含む請求項1記載の多層フィルム。
- 前記第一のスキン層の厚さが2μm以下である請求項1記載の多層フィルム。
- 前記コア層が結晶性のポリ乳酸ベースポリマーからなり、前記第一のスキン層の厚さが2μm以下であり、前記第二のスキン層の厚さが2μm以上であり、(前記第一のスキン層および前記第二のスキン層の厚さの合計)/(結晶性コア層の厚さ)≦0.5である請求項3記載の多層フィルム。
- 前記第一のスキン層が平均粒子サイズ0.1〜3μmの粒子を0.01〜0.3wt%含み、前記第二のスキン層が平均粒子サイズ1〜5μmの粒子を0.05〜0.5wt%含む請求項3記載の多層フィルム。
- 前記第一のスキン層および前記第二のスキン層の双方において、厚さ(t)および粒子の直径(d)が0.25≦t/d≦1の関係にある請求項6記載の多層フィルム。
- 前記第一の層の粒子がアルミノケイ酸塩の粒子である請求項6記載の多層フィルム。
- フィルムの透湿度(MVTR)が1.0g/m2 /日以下である請求項1記載の多層フィルム。
- フィルムがフィン型シール性およびラップ型シール性を持つ請求項1記載の多層フィルム。
- ポリ乳酸ベースポリマーからなるコア層と、本質的にアモルファスのポリ乳酸ベースポリマーからなる第一のスキン層と、該第一のスキン層上にある金属層とからなる二軸配向多層フィルム。
- 前記コア層が結晶性のポリ乳酸ベースポリマーからなる請求項11記載の二軸配向多層フィルム。
- 本質的にアモルファスのポリ乳酸ベースポリマーからなる第二のスキン層をさらに含む請求項11記載の二軸配向多層フィルム。
- 前記第一のスキン層の厚さが2μm以下である請求項11記載の二軸配向多層フィルム。
- 前記コア層が結晶性ポリ乳酸ベースポリマーからなり、前記第一のスキン層の厚さが2μm以下であり、前記第二のスキン層の厚さが2μm以上であり、(前記第一のスキン層および前記第二のスキン層の厚さの合計)/(結晶性コア層の厚さ)≦0.5である請求項13記載の二軸配向多層フィルム。
- 前記第一のスキン層が平均粒子サイズ0.1〜3μmの粒子を0.01〜0.3wt%含み、前記第二のスキン層が平均粒子サイズ1〜5μm粒子を0.05〜0.5wt%含む請求項13記載の二軸配向多層フィルム。
- 前記第一のスキン層および前記第二のスキン層の双方において、厚さ(t)および粒子の直径(d)が0.25≦t/d≦1の関係にある請求項16記載の二軸配向多層フィルム。
- 前記第一の層の粒子がアルミノケイ酸塩の粒子である請求項16記載の二軸配向多層フィルム。
- フィルムの透湿度(MVTR)が1.0g/m2 /日以下である請求項15記載の二軸配向多層フィルム。
- フィルムがフィン型シール性およびラップ型シール性を持つ請求項11記載の二軸配向多層フィルム。
- ポリ乳酸ベースポリマーからなるコア層と本質的にアモルファスのポリ乳酸ベースポリマーからなる第一のスキン層との共押出しと、該第一のスキン層上への金属層の蒸着からなる多層フィルムの製造方法。
- フィルムの二軸配向化をさらに含む請求項21記載の多層フィルムの製造方法。
- 前記コア層が結晶性のポリ乳酸ベースポリマーからなる請求項21記載の多層フィルムの製造方法。
- ポリ乳酸ベースポリマーからなる前記コア層とアモルファスのポリ乳酸ベースポリマーからなる前記第一のスキン層とともに、本質的にアモルファスのポリ乳酸ベースポリマーからなる第二のスキン層を共押出しすることをさらに含む請求項21記載の多層フィルムの製造方法。
- 前記第一のスキン層の厚さが2μm以下である請求項21記載の多層フィルムの製造方法。
- 前記コア層が結晶性ポリ乳酸ベースポリマーからなり、前記第一のスキン層の厚さが2μm以下であり、前記第二のスキン層の厚さが2μm以上であり、(前記第一のスキン層および前記第二のスキン層の厚さの合計)/(結晶性コア層の厚さ)≦0.5である請求項24記載の多層フィルムの製造方法。
-
前記第一のスキン層が平均粒子サイズ0.1〜3μmの粒子を0.01〜0.3wt%含み、前記第二のスキン層が平均粒子サイズ1〜5μm粒子を0.05〜0.5wt%含む請求項24記載の多層フィルムの製造方法。 - 前記第一のスキン層および前記第二のスキン層の双方において、厚さ(t)および粒子の直径(d)が0.25≦t/d≦1の関係にある請求項27記載の多層フィルムの製造方法。
- 前記第一の層の粒子がアルミノケイ酸塩の粒子である請求項27記載の多層フィルムの製造方法。
- フィルムの透湿度(MVTR)が1.0g/m2 /日以下である請求項21記載の多層フィルムの製造方法。
- フィルムがフィン型シール性およびラップ型シール性を持つ請求項21記載の多層フィルムの製造方法。
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