JP4314637B2 - 酸素吸収性樹脂組成物及び積層体 - Google Patents
酸素吸収性樹脂組成物及び積層体 Download PDFInfo
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- JP4314637B2 JP4314637B2 JP2004530608A JP2004530608A JP4314637B2 JP 4314637 B2 JP4314637 B2 JP 4314637B2 JP 2004530608 A JP2004530608 A JP 2004530608A JP 2004530608 A JP2004530608 A JP 2004530608A JP 4314637 B2 JP4314637 B2 JP 4314637B2
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Description
本発明は、酸素吸収性樹脂組成物及びその積層体に関する。
近年、包装容器としては、軽量で透明且つ易成形性等の利点を有するため、各種プラスチック容器が使用されている。
プラスチック容器は、金属容器やガラス容器と比べると、酸素バリヤー性が劣るため、容器内に充填された内容物の変質や、フレーバーの低下が問題になる。
また、本発明は、上記の酸素吸収性樹脂組成物を含む層を、少なくとも1層有することを特徴とする積層体を提供する。
本発明の酸素吸収性樹脂組成物は、炭素数2〜8のオレフィンを重合してなるポリオレフィン樹脂(A)、樹脂(A)以外の樹脂(B)、及び遷移金属触媒(C)を含有し、樹脂(B)がトリガーとなって樹脂(A)の酸化が進行する酸素吸収性樹脂組成物である。
これらは、樹脂(A)中に単独で含有されていてもよいし、二種以上の組合せで含有されていてもよい。
このような単量体としては、例えばブタジエン、イソプレン等の共役ジエン;1,4−ヘキサジエン、3−メチル−1,4−ヘキサジエン、4−メチル−1,4−ヘキサジエン、5−メチル−1,4−ヘキサジエン、4,5−ジメチル−1,4−ヘキサジエン、7−メチル−1,6−オクタジエン等の鎖状非共役ジエン;メチルテトラヒドロインデン、5−エチリデン−2−ノルボルネン、5−メチレン−2−ノルボルネン、5−イソプロピリデン−2−ノルボルネン、5−ビニリデン−2−ノルボルネン、6−クロロメチル−5−イソプロペニル−2−ノルボルネン、ジシクロペンタジエン等の環状非共役ジエン;2,3−ジイソプロピリデン−5−ノルボルネン、2−エチリデン−3−イソプロピリデン−5−ノルボルネン、2−プロペニル−2,2−ノルボルナジエン等のトリエン等が挙げられる。
また、スチレン共重合体がブロック共重合体である場合には、樹脂(A)に対する相溶性、分散性に優れるという利点を有する。
すなわち、樹脂(B)としては、スチレン−イソプレン共重合体等のスチレン共重合体が好ましく、特に、スチレン−イソプレン共重合体の一種であるスチレン−イソプレン−スチレントリブロック共重合体が好ましい。
無機酸塩としては、塩化物等のハライド、硫酸塩等の硫黄オキシ酸塩、硝酸塩等の窒素のオキシ酸塩、リン酸塩等のリンオキシ酸塩、ケイ酸塩等が挙げられる。
R−H(g) → R(g)+H(g)
表1
また、遷移金属触媒を比較的高い濃度で含有する樹脂のマスターバッチを調製し、これを未配合の樹脂と乾式ブレンドして調製することもできる。
ラジカル開始剤及び光増感剤としては、ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル等のベンゾイン及びそのアルキルエーテル類;アセトフェノン、2,2-ジメトキシ−2−フェニルアセトフェノン、2,2−ジエトキシ−2−フェニルアセトフェノン、1,1−ジクロロアセトフェノン、1−ヒドロキシシクロヘキシルフェニルケトン、2−ヒドロキシシクロヘキシルフェニルケトン、2−メチル−1−[4−(メチルチオ)フェニル]−2−モルフォリノ−プロパン−1−オン等のアセトフェノン類;2−メチルアントラキノン、2−アミルアントラキノン等のアントラキノン類;2,4−ジメチルチオキサントン、2,4−ジエチルチオキサントン、2−クロロチオキサントン、2,4−ジイソプロピルチオキサントン等のチオキサントン類、アセトフェノンジメチルケタール、ベンジルジメチルケタール等のケタール類;ベンゾフェノン等のベンゾフェノン類又はキサントン類等の一般に光開始剤として知られているものが使用される。かかる光ラジカル開始剤は、安息香酸系又は第三級アミン系等、公知慣用の光重合促進剤の一種又は二種以上と組み合わせて用いることができる。
本発明の積層体は、上記の酸素吸収性樹脂組成物を含む層(以下、酸素吸収層という)を少なくとも一層有している。尚、酸素吸収性樹脂組成物を含む層とは、上記の酸素吸収性樹脂組成物のみからなる層、及び他の樹脂等を基材とし酸素吸収性樹脂組成物を配合してなる層の両者の場合を含む。
積層体を構成する、酸素吸収層以外の樹脂層は、熱可塑性樹脂又は熱硬化性樹脂から、その使用態様や要求される機能により適宜選択できる。例えば、オレフィン系樹脂、熱可塑性ポリエステル樹脂、酸素バリヤー性樹脂等が挙げられる。
二層構造:PET/OAR、PE/OAR、OPP/OAR、
三層構造:PE/OAR/PET、PET/OAR/PET、PE/OAR/OPP、EVOH/OAR/PET、PE/OAR/COC、
四層構造:PE/PET/OAR/PET、PE/OAR/EVOH/PET、PET/OAR/EVOH/PET、PE/OAR/EVOH/COC、PE/OAR/EVOH/PE、
五層構造:PET/OAR/PET/OAR/PET、PE/PET/OAR/EVOH/PET、PET/OAR/EVOH/COC/PET、PET/OAR/PET/COC/PET、PE/OAR/EVOH/COC/PET、PE/EVOH/OAR/EVOH/PE、PP/EVOH/OAR/EVOH/PP、
六層構造:PET/OAR/PET/OAR/EVOH/PET、PE/PET/OAR/COC/EVOH/PET、PET/OAR/EVOH/PET/COC/PET、PE/EVOH/OAR/PE/EVOH/PE、PP/EVOH/OAR/PP/EVOH/PP、
七層構造:PET/OAR/COC/PET/EVOH/OAR/PET、
尚、PEとは、低密度ポリエチレン(LDPE)、中密度ポリエチレン(MDPE)、高密度ポリエチレン(HDPE)、線状低密度ポリエチレン(LLDPE)、線状超低密度ポリエチレン(LVLDPE)を意味する。
これにより、フィルム、シート、ボトル、カップ、キャップ、チューブ形成用パリソン又はパイプ、ボトル又はチューブ成形用プリフォーム等の積層体が成形できる。
さらに、フィルム又はシートを、真空成形、圧空成形、張出成形、プラグアシスト成形等の手段に付することにより、カップ状、トレイ状等の包装容器が得られる。
さらに、多層フィルムや多層シートの製造には、押出コート法や、サンドイッチラミネーションを用いることができ、また、予め形成されたフィルムのドライラミネーションによって多層フィルムあるいはシートを製造することもできる。
特に、酸素存在下で劣化を起こしやすい内容品、例えば、飲料ではビール、ワイン、フルーツジュース、炭酸ソフトドリンク等、食品では果物、ナッツ、野菜、肉製品、幼児食品、コーヒー、ジャム、マヨネーズ、ケチャップ、食用油、ドレッシング、ソース類、佃煮類、乳製品類等、その他では医薬品、化粧品、ガソリン等の包装材に有用である。
以下、本発明の実施例について説明するが、本発明はこれに限定されるものではない。
重クロロホルムを溶媒に用いて10〜15wt%の濃度に溶解し、13C−NMR測定(JEOL製、JNM−EX270)を行いスペクトルより樹脂の構造を同定した。それにより上記含有量は、樹脂1g中に含まれる二重結合のモル数(eq/g)を計算により求めた。
酸素吸収性樹脂組成物を電子顕微鏡用のエポキシ/アミン系包埋樹脂に埋め込み、包埋樹脂を硬化させた。次いで、ミクロトームを用いて包埋樹脂を研磨し、酸素吸収性樹脂組成物断面を削り出した。さらに、包埋試料の前記切削断面をウルトラミクロトームを用いて仕上げ研磨し、走査型電子顕微鏡(JSM−6300F:JEOL)により、前記仕上げ研磨断面のSEM写真を撮影し、酸素吸収性樹脂組成物中の樹脂(B)の分散状態を観察した。
[比較例1]
低密度ポリエチレン樹脂[JB221R;日本ポリオレフィン(株)製]100重量部に、スチレン樹脂[HRM24N;東洋スチレン(株)製]を5重量部と、遷移金属触媒としてネオデカン酸コバルト[DICNATE5000;大日本インキ化学工業(株)製]をコバルト換算で350ppmを配合し、撹拌乾燥機[ダルトン(株)製]で予備混練後ホッパーに投入した。定量フィーダーにより2軸押出機[TEM37、東芝機械(株)製]内に投入し、温度設定210℃、回転数100RPMでストランド状に押出、ペレット化を行った。
スチレン樹脂の代わりにスチレン含有量15重量%のスチレン−イソプレン−スチレントリブロック共重合体樹脂[SIS5200;JSR(株)製、この樹脂中の炭素−炭素二重結合含有量は0.014eq/gであった]を用いた以外は、比較例1と同じ方法でペレット化し、容器内酸素濃度を測定し、酸素吸収量(cc/g)を算出した。その結果を表2に示す。また、比較例1と同じ方法でペレット断面を観察した結果、スチレン−イソプレン−スチレントリブロック共重合体樹脂は低密度ポリエチレン樹脂のマトリックス中に均一に分散していた。
低密度ポリエチレン樹脂の代わりに線状低密度ポリエチレン樹脂[ULTZEX2020SB;三井住友ポリオレフィン(株)製]を用いた以外は、実施例1と同じ方法でペレット化し、容器内酸素濃度を測定し、酸素吸収量(cc/g)を算出した。その結果を表2に示す。また、比較例1と同じ方法でペレット断面を観察した結果、スチレン−イソプレン−スチレントリブロック共重合体樹脂は線状低密度ポリエチレン樹脂のマトリックス中に均一に分散していた。
低密度ポリエチレン樹脂の代わりに高密度ポリエチレン樹脂[KZ145N;日本ポリオレフィン(株)製]を用いた以外は、実施例1と同じ方法でペレット化し、容器内酸素濃度を測定し、酸素吸収量(cc/g)を算出した。その結果を表2に示す。また、比較例1と同じ方法でペレット断面を観察した結果、スチレン−イソプレン−スチレントリブロック共重合体樹脂は高密度ポリエチレン樹脂のマトリックス中に均一に分散していた。
スチレン樹脂[HRM24N;東洋スチレン(株)製]を配合しなかった以外は、比較例1と同様にペレット化を行い、容器内酸素濃度を測定し、酸素吸収量(cc/g)を算出した。その結果を表2に示す。
[比較例3]
低密度ポリエチレン樹脂の代わりに線状低密度ポリエチレン樹脂[ULTZEX2020SB;三井住友ポリオレフィン(株)製]を用いた以外は、比較例2と同様にペレット化を行い、容器内酸素濃度を測定し、酸素吸収量(cc/g)を算出した。その結果を表2に示す。
[比較例4]
低密度ポリエチレン樹脂の代わりに高密度ポリエチレン樹脂(KZ145N;日本ポリオレフィン(株)製)を用いた以外は、比較例2と同様にペレット化を行い、容器内酸素濃度を測定し、酸素吸収量(cc/g)を算出した。その結果を表2に示す。
表2
[実施例4]
実施例1でペレット化した酸素吸収性樹脂組成物と低密度ポリエチレン樹脂[JB221R;日本ポリオレフィン(株)製]、接着性樹脂[モディックL522;三菱化学(株)製]、バリヤー性樹脂[エバールF101B;(株)クラレ製]を用いて、公知の溶融ブロー成形法により口径45mm、内容量150mlの4種6層多層ボトルを作製した。
その層構成を下記に示す。
外側 ポリエチレン層/接着層/バリヤー層/接着層/酸素吸収層/ポリエチレン層
重量% 20/2.5/5/2.5/5/65
多層ボトルの酸素遮断性を評価する為、比較例1で用いた酸素不透過性容器内に蒸留水1mlを入れ、窒素雰囲気下で口部を比較例1で用いた蓋材でヒートシールして密封し、容器内の初期酸素濃度を0.02%以下とし、30℃、80%RHで保存した。この容器内酸素濃度を経時日時においてガスクロマトグラフィー[GC−8A島津製作所(株)製]を用いて測定した。その結果を表3に示す。
Claims (14)
- 炭素数2〜8のオレフィンを重合してなるポリオレフィン樹脂(A)、樹脂(A)以外の樹脂であって樹脂(A)の酸化のトリガーとなる樹脂(B)、及び遷移金属触媒(C)を含有し、樹脂(B)は樹脂(A)のマトリックス中に分散してなり、樹脂(A)の含有量が90〜99重量%であり、樹脂(B)がスチレン部分を15〜50重量%含有するスチレン共重合体であり、酸素に接触したときにマトリックス樹脂(A)の酸化反応が進行して酸素を吸収することを特徴とする酸素吸収性樹脂組成物。
- 遷移金属触媒(C)が少なくとも樹脂(A)中に存在する請求の範囲第1項に記載の酸素吸収性樹脂組成物。
- 樹脂(A)がエチレン構造を有する樹脂である請求の範囲第1項又は第2項に記載の酸素吸収性樹脂組成物。
- エチレン構造を有する樹脂が低密度ポリエチレン又は線状低密度ポリエチレンである請求の範囲第3項に記載の酸素吸収性樹脂組成物。
- 樹脂(B)の含有量が1.0〜10重量%である請求の範囲第1項〜第4項のいずれか1項に記載の酸素吸収性樹脂組成物。
- スチレン共重合体がブロック共重合体である請求の範囲第1項〜第5項のいずれか1項に記載の酸素吸収性樹脂組成物。
- スチレン共重合体が分子末端にポリスチレンブロックを有するブロック共重合体である請求の範囲第1項〜第6項のいずれか1項に記載の酸素吸収性樹脂組成物。
- スチレン共重合体がイソプレン単位を含むブロック共重合体である請求の範囲第1項〜第7項のいずれか1項に記載の酸素吸収性樹脂組成物。
- イソプレン単位を含むブロック共重合体がスチレン−イソプレン−スチレントリブロック共重合体である請求の範囲第8項に記載の酸素吸収性樹脂組成物。
- 酸素吸収性樹脂組成物中にベンゼン環以外の炭素−炭素二重結合の量が0.001eq/g以下で含有されている請求の範囲第1項〜第9項のいずれか1項に記載の酸素吸収性樹脂組成物。
- 遷移金属触媒が金属重量換算で10〜3000ppm含まれている請求の範囲第1項〜第10項のいずれか1項に記載の酸素吸収性樹脂組成物。
- 請求の範囲第1項〜第11項のいずれか1項に記載の酸素吸収性樹脂組成物を含む酸素吸収シート。
- 請求の範囲第1項〜第11項のいずれか1項に記載の酸素吸収性樹脂組成物を含む層を少なくとも1層有する積層体。
- さらに酸素バリヤー層を少なくとも1層有する請求の範囲第13項に記載の積層体。
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JP5158661B2 (ja) * | 1999-07-08 | 2013-03-06 | 株式会社クラレ | 熱可塑性樹脂組成物および該組成物を用いた多層容器 |
CA2313399C (en) * | 1999-07-08 | 2005-02-15 | Kuraray Co., Ltd. | Thermoplastic resin composition and multilayered container using the same |
JP2001031759A (ja) * | 1999-07-23 | 2001-02-06 | Showa Denko Kk | 分岐鎖に不飽和結合を有する重縮合系酸素捕捉性ポリマー |
JP2001039475A (ja) | 1999-07-27 | 2001-02-13 | Toyo Seikan Kaisha Ltd | 樹脂組成物、積層体、容器及び容器蓋 |
JP3777888B2 (ja) * | 1999-07-27 | 2006-05-24 | 東洋製罐株式会社 | 樹脂組成物、積層体、容器及び容器蓋 |
JP3291276B2 (ja) | 1999-10-06 | 2002-06-10 | 三井化学株式会社 | ポリエステル系ポリマーアロイ |
CA2355855C (en) * | 1999-10-22 | 2006-08-22 | Kawasaki Steel Corporation | Metal-surface-treating composition and surface-treated metal material |
JP4889891B2 (ja) | 2000-09-01 | 2012-03-07 | 株式会社クラレ | 樹脂組成物および多層容器 |
JP4314637B2 (ja) * | 2002-08-23 | 2009-08-19 | 東洋製罐株式会社 | 酸素吸収性樹脂組成物及び積層体 |
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2003
- 2003-08-22 JP JP2004530608A patent/JP4314637B2/ja not_active Expired - Fee Related
- 2003-08-22 AT AT03792810T patent/ATE551393T1/de active
- 2003-08-22 CN CNB038226316A patent/CN1312207C/zh not_active Expired - Fee Related
- 2003-08-22 KR KR1020057002985A patent/KR100679310B1/ko active IP Right Grant
- 2003-08-22 WO PCT/JP2003/010657 patent/WO2004018556A1/ja active IP Right Grant
- 2003-08-22 AU AU2003262283A patent/AU2003262283B2/en not_active Ceased
- 2003-08-22 EP EP20030792810 patent/EP1553137B1/en not_active Expired - Lifetime
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2005
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008195949A (ja) * | 2002-08-23 | 2008-08-28 | Toyo Seikan Kaisha Ltd | 酸素吸収性樹脂組成物及び積層体 |
JP2007119607A (ja) * | 2005-10-28 | 2007-05-17 | Nippon Zeon Co Ltd | 酸素吸収性樹脂組成物、酸素吸収性フィルム並びに酸素吸収性多層体 |
JP2007119606A (ja) * | 2005-10-28 | 2007-05-17 | Nippon Zeon Co Ltd | 酸素吸収性樹脂組成物、酸素吸収性フィルム並びに酸素吸収性多層体 |
WO2012102086A1 (ja) | 2011-01-27 | 2012-08-02 | 東洋製罐株式会社 | 酸素吸収性樹脂組成物 |
US9764308B2 (en) | 2011-01-27 | 2017-09-19 | Toyo Seikan Group Holdings, Ltd. | Oxygen-absorbing resin composition |
US9919291B2 (en) | 2011-01-27 | 2018-03-20 | Toyo Seikan Group Holdings, Ltd. | Oxygen-absorbing resin composition |
WO2013059401A1 (en) * | 2011-10-19 | 2013-04-25 | Multisorb Technologies, Inc. | Poly (lactic acid) and polyolefin films containing porosity and sorbents |
WO2013099921A1 (ja) | 2011-12-26 | 2013-07-04 | 東洋製罐グループホールディングス株式会社 | 酸素吸収性樹脂組成物 |
US10233306B2 (en) | 2011-12-26 | 2019-03-19 | Toyo Seikan Group Holdings, Ltd. | Oxygen-absorbing resin composition |
Also Published As
Publication number | Publication date |
---|---|
JP2008195949A (ja) | 2008-08-28 |
US8592522B2 (en) | 2013-11-26 |
KR20050058435A (ko) | 2005-06-16 |
EP1553137B1 (en) | 2012-03-28 |
EP1553137A1 (en) | 2005-07-13 |
US20050142373A1 (en) | 2005-06-30 |
KR100679310B1 (ko) | 2007-02-06 |
JP5370906B2 (ja) | 2013-12-18 |
JPWO2004018556A1 (ja) | 2005-12-08 |
CN1685005A (zh) | 2005-10-19 |
CN1312207C (zh) | 2007-04-25 |
AU2003262283B2 (en) | 2007-03-22 |
ATE551393T1 (de) | 2012-04-15 |
WO2004018556A1 (ja) | 2004-03-04 |
EP1553137A4 (en) | 2006-04-26 |
AU2003262283A1 (en) | 2004-03-11 |
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