JP2021534016A - 熱可塑性重合体と無機充填剤を含む薄膜の製法 - Google Patents
熱可塑性重合体と無機充填剤を含む薄膜の製法 Download PDFInfo
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Abstract
Description
少なくとも1種の熱可塑性重合体と、少なくとも1種の無機充填剤とを含む混合物を準備する工程と、
混合物を溶融する工程と、
溶融した混合物から厚膜(流延厚膜)を製造する工程と、
得られた厚膜を冷却する工程と、
縦方向と横方向に厚膜を薄膜に延伸する工程とを含み、
薄膜は、熱可塑性重合体少なくとも20重量%と、無機充填剤50重量%の〜75重量%とを含み、無機充填剤の最大粒径は、5μmであり、縦方向延伸比は、少なくとも3.5であり、横方向延伸比も少なくとも3.5である。
少なくとも1種の熱可塑性重合体と、少なくとも1種の無機充填剤とを含む混合物を準備(調製)する工程と、
混合物を溶融する工程と、
溶融した混合物を押し出して、厚膜を製造する工程と、
冷却ロールで得られた厚膜を冷却する工程と、
縦方向と横方向とに厚膜を薄膜に延伸する工程とを含み、
薄膜は、熱可塑性重合体少なくとも20重量%と、無機充填剤50重量%〜75重量%とを含み、無機充填剤の粒径は、最大5μmであり、縦方向延伸比は、少なくとも3.5であり、横方向延伸比も少なくとも3.5である。
少なくとも1種の熱可塑性重合体と、少なくとも1種の無機充填剤とを含む混合物を準備する工程と、
混合物を溶融する工程と、
溶融混合物を金型開口から押出して、厚膜を製造する工程と、
エアナイフを用いて、冷却ロール上で得られる厚膜を冷却する工程と、
厚膜温度を130℃〜165℃に保持して、厚膜を縦方向に延伸する工程と、
縦方向に延伸した薄膜を、温度145℃〜175℃に保持して、横方向に延伸する工程と、
横方向延伸時の薄膜温度より5℃〜20℃高い温度で薄膜を加熱処理する工程と、
加熱処理時の薄膜温度より5℃〜20℃低い薄膜温度で、薄膜の横方向延伸量を20%減少させて、薄膜を弛緩させる工程と、
薄膜の側縁を切除する工程と、
薄膜をコロナ処理する工程と、
薄膜を巻き上げる工程とを含み、
薄膜の熱可塑性重合体容量は、少なくとも20重量%であり、薄膜の無機充填剤容量範囲は、50重量%〜75重量%にあり、無機充填剤の最大粒径は、5μmであり、縦方向延伸比が少なくとも3.5であり、横方向延伸比も少なくとも3.5である。
溶融時流動度2g/10分のポリプロピレン40重量%と、平均粒径1.6μmの炭酸カルシウム60重量%とを、共回転二軸押出機で混合した。得られた混合物(成形材料)を金型開口から押出した。次に、冷却ロールにより溶融物を冷却し、得られた薄膜から長方形薄膜片を切出した。
Claims (16)
- 少なくとも1種の熱可塑性重合体と、少なくとも1種の無機充填剤とを含む薄膜の製法において、
少なくとも1種の熱可塑性重合体と、少なくとも1種の無機充填剤とを含む混合物を準備する準備工程と、
混合物を溶融する溶融工程と、
溶融した混合物から厚膜を作成する厚膜準備工程と、
得られた厚膜を冷却する冷却工程と、
縦方向と横方向とに厚膜を延伸して、薄膜を製造する延伸工程とを含み、
薄膜は、少なくとも熱可塑性重合体20重量%と、無機充填剤50重量%〜75重量%とを含み、無機充填剤の最大粒径は、5μmであり、縦方向延伸比は、少なくとも3.5であり、横方向延伸比も少なくとも3.5であることを特徴とする薄膜の製法。 - 延伸工程は、縦方向延伸と横方向延伸とを順次行う請求項1に記載の製法。
- 縦方向延伸比と、横方向延伸比の範囲は、何れも3.5〜7.5である請求項1又は2に記載の製法。
- 縦方向延伸比と、横方向延伸比の範囲は、何れも4〜7である請求項1〜3の何れか1項に記載の製法。
- 縦方向延伸比の範囲は、4〜5.5であり、横方向延伸比の範囲は、4.4〜6である請求項1〜4の何れか1項に記載の製法。
- 少なくとも1種の熱可塑性重合体は、ポリエチレン、ポリプロピレン又はこれらの混合物からなる群から選択される請求項1〜5の何れか1項に記載の製法。
- 無機充填剤は、炭酸カルシウム、炭塵、粉末、硫酸カルシウム、硫酸バリウム、カオリン、雲母、酸化亜鉛、ドロマイト、ケイ酸カルシウム、ガラス、ケイ酸塩、白墨、滑石、顔料、二酸化チタン、二酸化ケイ素、ベントナイト、粘土、珪藻土及びこれらの混合物からなる群から選択される請求項1〜6の何れか1項に記載の製法。
- 無機充填剤は、炭酸カルシウムである請求項1〜7の何れか1項に記載の製法。
- 無機充填剤の最大粒径は、5μm、好適には3μm、最適には2μmである請求項1〜8の何れか1項に記載の製法。
- 無機充填剤の粒径は、少なくとも0.1μm、好適には少なくとも0.5μmである請求項1〜9の何れか1項に記載の製法。
- 薄膜は、25重量%以下の少なくとも1種のポリオレフィン弾性重合体を更に含む請求項1〜10の何れか1項に記載の製法。
- 少なくとも1種のポリオレフィン弾性重合体は、ポリイソブチレン、エチレン−プロピレンゴム及びエチレン−プロピレン−ジエンモノマーゴムからなる群から選択される請求項11に記載の製法。
- 薄膜は、5%以下、好ましくは1重量%〜5重量%の範囲量の助剤を含む請求項1〜12の何れか1項に記載の製法。
- 薄膜は、接着促進剤、分散剤、安定剤、滑剤、帯電防止剤、固体可塑剤、活性化剤、促進剤、経年劣化防止剤、焼焦げ予防剤、結合剤、耐熱剤、開始剤、重合触媒、乳化剤、可塑剤、熱安定剤、光安定剤、難燃剤及び離型剤からなる群から選択される少なくとも1種の助剤を含む請求項1〜13の何れか1項に記載の製法。
- 薄膜は、ポリエチレンワックス又はポリプロピレンワックスからなる群から選択される延伸助剤を好ましくは含む請求項1〜14の何れか1項に記載の製法。
- 請求項1〜15の何れか1項に記載の製法により製造されることを特徴とする薄膜。
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DE102018119541.9 | 2018-08-10 | ||
PCT/EP2019/070021 WO2020030433A1 (de) | 2018-08-10 | 2019-07-25 | Verfahren zur herstellung einer folie umfassend thermoplastisches polymer und anorganischen füllstoff |
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