JP6180631B2 - 改善された金属接着性を有する金属化ポリエチレンフィルム - Google Patents
改善された金属接着性を有する金属化ポリエチレンフィルム Download PDFInfo
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- JP6180631B2 JP6180631B2 JP2016523718A JP2016523718A JP6180631B2 JP 6180631 B2 JP6180631 B2 JP 6180631B2 JP 2016523718 A JP2016523718 A JP 2016523718A JP 2016523718 A JP2016523718 A JP 2016523718A JP 6180631 B2 JP6180631 B2 JP 6180631B2
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- ethylene
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- film
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Images
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/546—Flexural strength; Flexion stiffness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/75—Printability
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/02—Open containers
- B32B2439/06—Bags, sacks, sachets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
- B32B2439/46—Bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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Description
表皮層は、(a)100パーセント以下、例えば、少なくとも70パーセント、または少なくとも80パーセント、または少なくとも90重量パーセントのエチレン由来単位、及び(b)30パーセント未満、例えば、25パーセント未満、または20パーセント未満、または10重量パーセント未満の1つ以上のα−オレフィンコモノマー由来単位を含む、少なくとも50重量パーセント(重量%)のLLDPE(エチレン/α−オレフィンインターポリマー)組成物を含む。用語「エチレン/α−オレフィンインターポリマー組成物」は、(重合性モノマーの総量に基づいて)50モルパーセントを超える重合エチレンモノマーを含有し、任意選択的に少なくとも1つのコモノマーを含有し得るポリマーを指す。
T4は各々の存在において独立して、C2−20のアルキレン基、シクロアルキレン基もしくはシクロアルケニレン基、またはそれらの不活性的に置換された誘導体であり、
R21は各々の存在において独立して、水素を数えず最大50原子の水素、ハロ基、ヒドロカルビル基、トリヒドロカルビルシリル基、トリヒドロカルビルシリルヒドロカルビル基、アルコキシ基、もしくはジ(ヒドロカルビル)アミノ基であり、
R3は各々の存在において独立して、水素を数えず最大50原子の水素、ハロ基、ヒドロカルビル基、トリヒドロカルビルシリル基、トリヒドロカルビルシリルヒドロカルビル基、アルコキシ基、もしくはアミノ基であるか、あるいは同一のアリレン環上の2つのR3基が共に、または同一もしくは異なるアリレン環上のR3及びR21基が共に、2つの位置においてアリレン基に結合する二価リガンド基を形成するか、もしくは2つの異なるアリレン環を1つに結合させ、
RDは各々の存在において独立して、水素を数えず、最大20原子のハロ基もしくはヒドロカルビル基もしくはトリヒドロカルビルシリル基であり、または2つのRD基が共に、ヒドロカルビレン基、ヒドロカルバジイル基、ジエン基、もしくはポリ(ヒドロカルビル)シリレン基である。
いくつかの実施形態において、多層フィルムは、表皮層に加えて、1つ以上のポリマー層を備える。かかる1つ以上の追加の層は、エチレン系ポリマーからなる群から選択される1つ以上の成分を含む。
基材は、多層構造体において使用するのに好適ないずれの1つ以上の材料を含んでもよい。かかる材料には、例えば、熱可塑性物質が含まれる。好適な熱可塑性物質は、例えば、ポリエチレンテレフタレート、ポリエチレン、キャストポリプロピレン、二軸配向ポリプロピレン、及びそれらの2つ以上の任意の組み合わせを含む。
外側の表皮層の金属化は、いずれの適切な技術を使用して達成されてもよい。いくつかの実施形態において、LLDPEの表皮層(複数可)は、金属化の前に、コロナ処理及びプラズマ処理等によって事前処理され得る。金属化は、物理的蒸着プロセスによって行われ得る。かかるプロセスにおいて、金属は、真空下で熱され、蒸発される。次に、金属は、表皮LLDPE層上で凝結する。
種々の実施形態による多層構造体は、フィルム、袋、及び包装フィルムからなる群から選択され得る。
表皮層、コア層の第1の側面上で表皮層に隣接するコア層、及びコア層の第2の側面上でコア層に隣接する封止層を有する三層フィルム。表2に示される特性を有する50kgの実験LLDPE(実験EPE1)を使用して、表皮層(金属化される層)及び封止層中に実験EPE1を有する三層の吹込フィルムを作製した。コア層は、ELITE(商標)5960Gであった。三層吹込フィルムを作製するために使用された吹込フィルム工機は、以下の通りである:直径400mmのダイ、2.2mmのダイギャップ、2.5のBUR及びIBCによる気泡冷却、420kg/時間の生産量、最大2200mmのフィルム幅、40ミクロンのフィルム厚、1:1.5:1の層比、ならびに約46ダインのコロナ処理を有する、LDPE及びLLDPE(直鎖状低密度ポリエチレン)用の三層吹込フィルムねじ式押出機。溶融温度を225℃及びダイ温度を220℃に保った。以下の表1は、三層及び発明の多層フィルム実施例1を生成するために使用された吹込フィルム工機のダイの各々の領域温度(℃)を提供する。
以下の方法に従って、付着強度試料の調製及び測定を行った。
1.試験される積層体から1インチの試料片を切り取る。試料はいずれの方向で切り取ってもよい。
2.各2つの基材について、引張試験機が試験の開始時にゼロを読み取るように、引張試験機の顎部の間に適合するのに十分な長さの離層タブが必要となる。積層範囲の開始点は、そのタブの方向に対して垂直である必要があり、これは「T型剥離」とも称される。
3.離層は、複数の方法で実施され得る。有機溶剤を使用して、1インチの試料点を離層して、タブを顎部に固定するためにわずかに付着を除去し得る。
1.ゼロに設定された引張試験機の顎部に試料を配置する。
2.引張試験機のクロスヘッド速度を250mm/分に設定する。
3.付着強度測定及び破断状況を記録する。
表4に示される樹脂を使用して、第2の三層吹込フィルムである発明の多層フィルム実施例2も作製した。
試験方法には、以下が含まれる。
ASTM方法D−792に従って、樹脂密度を測定した。
ASTM方法D−1238に従って、(エチレン系樹脂の)I2を測定した。
なお、本発明には、以下の実施形態が包含される。
[1](a)少なくとも50重量パーセントの、45〜400の範囲のコモノマー分布定数(CDC)を有するエチレン/α−オレフィンインターポリマー組成物(LLDPE)を含む表皮層であって、移行性添加剤を一切含有しない、表皮層と、
(b)前記表皮層上に配置されて、金属化フィルムを形成する金属層と、
(c)前記金属化フィルム上に積層された少なくとも1つの基材層と、を備える、多層構造体であって、
前記エチレン/α−オレフィンインターポリマー組成物が、(i)100重量パーセント以下のエチレン由来単位と、(ii)30重量パーセント未満の1つ以上のα−オレフィンコモノマー由来単位と、を含む、前記多層構造体。
[2]前記エチレン/α−オレフィンインターポリマー組成物が、75〜200の範囲のコモノマー分布定数(CDC)、前記エチレン系ポリマー組成物の骨格中に存在する炭素原子1000個当たり0.15ビニル未満のビニル不飽和度、2〜20の範囲のゼロせん断粘度比(ZSVR)、0.903〜0.950g/cm3の範囲の密度、0.1〜5g/10分の範囲のメルトインデックス(I2)、1.8〜4の範囲の分子量分布(Mw/Mn)を有する、[1]に記載の前記多層構造体。
[3]前記少なくとも1つの基材層が、ポリエチレン、キャストポリプロピレン、二軸配向ポリプロピレン、及び二軸配向ポリエチレンテレフタレートからなる群から選択される少なくとも1つを含む、[1]に記載の前記多層構造体。
[4]前記金属化フィルムが、1つ以上の追加のポリエチレン層を更に備える、[1]に記載の前記多層構造体。
[5]前記金属化フィルムが、接着剤積層または押出積層によって前記基材上に積層され、前記多層構造体が、前記表皮層が1つ以上の移行性添加剤を含有することを除いて同一である組成物を有する多層構造体と比較して、より良好な付着強度及びより低度な金属移行を示す、[1]に記載の前記多層構造体。
[6]前記構造体が、袋または包装フィルムである、[1]〜[5]のいずれか一項に記載の前記多層構造体。
[7]前記構造体が、ある形状に積層、印刷、及び/または形成される、[1]〜[6]のいずれか一項に記載の前記多層構造体。
[8]前記多層フィルムが、キャストフィルムプロセスまたは吹込フィルムプロセスによって生成される、[1]〜[7]のいずれか一項に記載の前記多層構造体。
[9]前記金属化フィルムが、2〜3の光学密度を有する、[1]〜[8]のいずれか一項に記載の前記多層構造体。
Claims (5)
- (a)少なくとも50重量パーセントの、45〜400の範囲のコモノマー分布定数(CDC)を有するエチレン/α−オレフィンインターポリマー組成物(LLDPE)を含む表皮層であって、移行性添加剤を一切含有しない、表皮層と、
(b)前記表皮層上に配置されて、金属化フィルムを形成する金属層と、
(c)前記金属化フィルム上に積層された少なくとも1つの基材層と、を備える、多層構造体であって、
前記エチレン/α−オレフィンインターポリマー組成物が、(i)100重量パーセント以下のエチレン由来単位と、(ii)30重量パーセント未満の1つ以上のα−オレフィンコモノマー由来単位と、を含む、前記多層構造体。 - 前記エチレン/α−オレフィンインターポリマー組成物が、75〜200の範囲のコモノマー分布定数(CDC)、前記エチレン系ポリマー組成物の骨格中に存在する炭素原子1000個当たり0.15ビニル未満のビニル不飽和度、2〜20の範囲のゼロせん断粘度比(ZSVR)、0.903〜0.950g/cm3の範囲の密度、0.1〜5g/10分の範囲のメルトインデックス(I2)、1.8〜4の範囲の分子量分布(Mw/Mn)を有する、請求項1に記載の前記多層構造体。
- 前記少なくとも1つの基材層が、ポリエチレン、キャストポリプロピレン、二軸配向ポリプロピレン、及び二軸配向ポリエチレンテレフタレートからなる群から選択される少なくとも1つを含む、請求項1に記載の前記多層構造体。
- 前記金属化フィルムが、接着剤積層によって前記基材上に積層され、前記多層構造体が、前記表皮層が1つ以上の移行性添加剤を含有することを除いて同一である組成物を有する多層構造体と比較して、より良好な付着強度及びより低度な金属移行を示す、請求項1に記載の前記多層構造体。
- 前記構造体が、袋または包装フィルムである、請求項1〜4のいずれか一項に記載の前記多層構造体。
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