JP2023554369A - 収縮率が改善されたポリ塩化ビニリデン単層フィルム製造用組成物およびそれを含む食品包装パッケージ - Google Patents
収縮率が改善されたポリ塩化ビニリデン単層フィルム製造用組成物およびそれを含む食品包装パッケージ Download PDFInfo
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Abstract
Description
前記塩化ビニリデン系共重合体組成物の170℃で溶融する結晶の含量は、全結晶の含量に対して5~45%であってもよい。
前記可塑剤は、エポキシ化大豆油(ESO、epoxidized soybean oil)、セバシン酸ジブチル(DBS、dibutyl sebacate)、クエン酸アセチルトリブチル(ATBC、acetyl tri-n-butyl citrate)、またはこれらの組み合わせを含んでもよい。
前記b)ステップは、前記押出物のガラス転移温度(Tg)超過および溶融温度(Tm)未満の温度で行われてもよい。
前記可塑剤は、前記塩化ビニリデン系共重合体の総重量に対して1~10重量%、好適には2~8重量%で含まれてもよい。
前記添加剤は、前記塩化ビニリデン系共重合体の総重量に対して0.01~5.0重量%、好適には0.1~3.5重量%で含まれてもよい。
前記加熱延伸は、前記押出物のガラス転移温度(Tg)超過および溶融温度(Tm)未満の温度で行われてもよい。例えば5~50℃、好適には10~40℃の温度で行われてもよい。
(実施例1~3および比較例1~2)
下記表1のPVDC系共重合体を含む配合物を準備し、Egan社製のL/D=22.4である3.5’’1軸(single screw)押出機を用いて150℃でブローフィルム(blown film)を加工し、具体的な条件は、下記<加工条件>に記載されたとおりである。
供給速度(Feed rate)(kg/hr)=120
1軸(single screw)rpm=40
温度(Temp)(SV)175-180-156-153-150℃
急冷槽(Quenching bath)(℃)=10
加温槽(Warming bath)(℃)=25
延伸比(直径比:ダイ/最終フィルム(diameter ratio:die/final film))=3.2
評価例1:単層フィルムの収縮率の評価
実施例1および比較例2で製造されたダブルバブル(Double bubble)形状を肉眼で観察し、その結果を図3aおよび3bに示した。
1)結晶化度の測定方法
結晶化度=A/B*100
A:熱処理(heat setting)を行っていないフィルムの溶融熱(Heat of fusion)
B:VDCホモポリマー(homopolymer)が有する理論的溶融熱(Heat of fusion)
溶融温度170℃での結晶の含量の測定は、示差走査熱量計(Differential scanning calorimetry、DSC)を用いて測定した。先ず、数mgのサンプルをアルミニウムパンに入れて密封(hermetic seal)した後、METTLER TOLEDO社製のDSC(モデル名:DSC822)で、シーケンスを適用して得られた図2aのDSCピークパターンにおいて、170℃付近に現れる溶融熱ピークの積分値を全ピークの積分値で割って計算した。
結晶化速度の測定は、示差走査熱量計(Differential scanning calorimetry、DSC)を用いて測定した。先ず、数mgのサンプルをアルミニウムパンに入れて密封(hermetic seal)した後、TA Instruments社製のDSC(モデル名:DSC Q2000)で、下記シーケンスを適用して得られた時間に応じた結晶化ピークにおけるピークの最大値となる地点の時間を測定した。
1.傾斜昇温(Ramp)20℃→180℃
2.等温を1分間維持(Isothermal for 1 min)
3.130℃に急速冷却(Jump to 130℃)
4.等温を60分間維持(Isothermal 60 min)
図2cのように、21ステップのシーケンスに従って測定を行う。ステップ1からステップ20までには、図2cに表示された各温度で結晶を形成させる過程であり、ステップ21で形成された結晶を溶融させつつ溶融熱を測定し、各温度区間別の結晶の含量を測定する過程である。
実施例1~3および比較例1~2で製造された単層フィルムの2軸方向延伸のバブル形状を肉眼で観察し、下記基準で評価して表2に示した。
(評価基準-対称形:O、非対称型:△、バブルの形成不可:X)
Claims (12)
- 塩化ビニルコモノマー含有第1塩化ビニリデン共重合体(PVDC-VC)と、
メチルアクリレートコモノマー含有第2塩化ビニリデン共重合体(PVDC-MA)と、を含む塩化ビニリデン系共重合体組成物を含み、
前記塩化ビニリデン系共重合体組成物の結晶化度が25~45%である、単層フィルム。 - 第1塩化ビニリデン共重合体は、前記単層フィルムの総重量に対して50重量%超過90重量%未満で含まれ、
第2塩化ビニリデン共重合体は、前記単層フィルムの総重量に対して10重量%超過50重量%未満で含まれる、請求項1に記載の単層フィルム。 - 第1塩化ビニリデン共重合体は、塩化ビニルコモノマーを10~25重量%含み、
第2塩化ビニリデン共重合体は、メチルアクリレートコモノマーを2~8重量%含む、請求項1に記載の単層フィルム。 - 前記塩化ビニリデン系共重合体組成物の結晶化速度は7~25分である、請求項1に記載の単層フィルム。
- 前記塩化ビニリデン系共重合体組成物の170℃で溶融する結晶の含量は、全結晶の含量に対して5~45%である、請求項1に記載の単層フィルム。
- 前記単層フィルムは、可塑剤、添加剤、またはこれらの組み合わせをさらに含む、請求項1に記載の単層フィルム。
- 前記可塑剤は、エポキシ化大豆油(ESO、epoxidized soybean oil)、セバシン酸ジブチル(DBS、dibutyl sebacate)、クエン酸アセチルトリブチル(ATBC、acetyl tri-n-butyl citrate)、またはこれらの組み合わせを含む、請求項6に記載の単層フィルム。
- 前記添加剤は、ポリオレフィン系ワックス、酸化ポリオレフィン系ワックス、アクリル系ワックス、エステル系ワックス、アミド系ワックス、ステアリン酸塩、前記添加剤の誘導体、またはこれらの組み合わせを含む、請求項6に記載の単層フィルム。
- a)塩化ビニリデン系高分子混合物を溶融および押出するステップと、
b)前記押出物を少なくとも2軸方向に加熱延伸するステップと、
c)前記延伸物を熱処理するステップと、
を含む、単層フィルムの製造方法。 - 前記b)ステップは、前記押出物を長さ方向および幅方向に同時に延伸する同時2軸延伸により行われる、請求項9に記載の単層フィルムの製造方法。
- 前記b)ステップは、前記押出物のガラス転移温度(Tg)超過および溶融温度(Tm)未満の温度で行われる、請求項9に記載の単層フィルムの製造方法。
- 請求項1~8のいずれか一項に記載の単層フィルムを含む容器。
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| CN202011499165.XA CN114644798A (zh) | 2020-12-18 | 2020-12-18 | 用于制备具有改善的收缩率的聚偏二氯乙烯单层薄膜的组合物及包含该组合物的食品包装 |
| PCT/KR2021/019321 WO2022131868A1 (ko) | 2020-12-18 | 2021-12-17 | 수축률이 개선된 폴리염화비닐리덴 단층 필름 제조용 조성물 및 이를 포함하는 식품 포장 패키지 |
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- 2021-12-17 US US18/267,864 patent/US20240052118A1/en active Pending
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| EP4257634A1 (en) | 2023-10-11 |
| WO2022131868A1 (ko) | 2022-06-23 |
| KR20230125192A (ko) | 2023-08-29 |
| US20240052118A1 (en) | 2024-02-15 |
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