JP7042248B2 - ポリマー組成物、発泡体およびその方法 - Google Patents
ポリマー組成物、発泡体およびその方法 Download PDFInfo
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Description
セルサイズ分布が40 μmから135 μmの範囲にあること;
セルのアスペクト比が1から2.5の範囲にあること;
セルの数が当該発泡体の100 μm x 100 μm断面あたり1から10であること;および
当該発泡体の密度が0.2 g/cm3以下であること
で特徴付けられる。
セルサイズ分布が10 μmから30 μmの範囲にあること;
セルのアスペクト比が1から1.5の範囲にあること;
セルの数が当該発泡体の100 μm x 100 μm断面あたり20から30であること;および
当該発泡体の密度が0.2から0.45 g/cm3であること
で特徴付けられる。
セルサイズ分布が10 μmから50 μmの範囲にあること;
セルのアスペクト比が1から1.5の範囲にあること;
セルの数が、当該発泡体の100 μm x 100 μm断面あたり5から30であること;および
当該発泡体の密度が0.3から0.6 g/cm3であること
で特徴付けられる。
Claims (24)
- 超臨界流体で発泡するために用いる、発泡体を製造するためのポリマー組成物であって、ビニル芳香族系コポリマーおよび加工助剤を含み、ポリマー組成物の総重量における前記加工助剤の量は5重量%以上かつ30重量%未満であって、前記加工助剤は加工油を含み;エチレン-酢酸ビニルコポリマー、エチレン-アクリル酸ブチルコポリマー、エチレン-α-オレフィンコポリマー、ポリエチレンのホモポリマーおよびコポリマー、ポリプロピレンのホモポリマーおよびコポリマー、ポリブテンのホモポリマーおよびコポリマーならびにオレフィン系イオン性ポリマーを含まず、前記ビニル芳香族系コポリマーは水素化コポリマーであり、前記ビニル芳香族系コポリマーの重量平均分子量は200,000から500,000の範囲にあり、前記ビニル芳香族系コポリマーのビニル芳香族モノマー含量は20重量%から35重量%であり、前記ビニル芳香族系コポリマーにおける共役ジエンモノマーのビニル構造含量は30重量%から45重量%であり、かつ、
前記発泡体は、複数のセルを含み、前記発泡体の密度は0.2 g/cm3以下であって、前記発泡体の落下ボールリバウンド値は35%以上40%未満である、ポリマー組成物。 - いかなるオレフィン系ポリマーも含まない、請求項1に記載のポリマー組成物。
- 前記ビニル芳香族系コポリマーおよび前記加工助剤のみを含む、請求項1に記載のポリマー組成物
- 前記ビニル芳香族系コポリマーがスチレン-エチレン-ブチレン-スチレンブロックコポリマーである、請求項1に記載のポリマー組成物。
- 結晶性ポリマーをさらに含む、請求項1に記載のポリマー組成物。
- 相溶化剤をさらに含む、請求項5に記載のポリマー組成物。
- ポリマー組成物の総重量における前記結晶性ポリマーの含量は1重量%以上かつ40重量%未満である、請求項5に記載のポリマー組成物。
- 相溶化剤をさらに含み、ポリマー組成物の総重量における前記相溶化剤の含量は25重量%以下である、請求項5に記載のポリマー組成物。
- 前記結晶性ポリマーはポリアミドであり、ポリマー組成物の総重量における前記ポリアミドの含量は10重量%以上かつ40重量%未満である、請求項5に記載のポリマー組成物。
- 相溶化剤をさらに含み、前記相溶化剤は無水マレイン酸グラフト化スチレン-エチレン-ブチレン-スチレンブロックコポリマーであり、ポリマー組成物の総重量における前記無水マレイン酸グラフト化スチレン-エチレン-ブチレン-スチレンブロックコポリマーの含量は5重量%以上かつ25重量%未満である、請求項9に記載のポリマー組成物。
- 前記結晶性ポリマーは熱可塑性ポリエステルエラストマーであり、ポリマー組成物の総重量における前記熱可塑性ポリエステルエラストマーの含量は1重量%以上かつ10重量%未満である、請求項5に記載のポリマー組成物。
- 相溶化剤をさらに含み、前記相溶化剤は無水マレイン酸グラフト化スチレン-エチレン-ブチレン-スチレンブロックコポリマーであり、ポリマー組成物の総重量における前記無水マレイン酸グラフト化スチレン-エチレン-ブチレン-スチレンブロックコポリマーの含量は5重量%以上かつ15重量%未満である、請求項5に記載のポリマー組成物。
- 前記加工助剤は、加工油、粘着付与剤、可塑剤、溶融強度増強剤、またはそれらのいずれかの組合せから選択される、請求項1に記載のポリマー組成物。
- 前記加工油は芳香族油、ナフテン油またはパラフィンオイルである、請求項1または13に記載のポリマー組成物。
- 発泡体を製造するための方法であって、請求項1~14のいずれか一項に記載のポリマー組成物を用いて、非発泡体を形成すること、および、前記非発泡体を物理的に発泡させて発泡体を形成することを含む、方法。
- ニーダーを用いるバッチ式によって前記非発泡体を形成すること、および、前記非発泡体を超臨界流体含浸機に送ることによって、前記発泡体を形成することをさらに含む、請求項15に記載の方法。
- 発泡体を製造するための方法であって、請求項1~14のいずれか一項に記載のポリマー組成物を押出し発泡機に充填すること、および、前記押出し発泡機で連続式を用いて、前記ポリマー組成物を混練し、成形し、次いで、発泡して、発泡体を直接形成することを含み、超臨界流体を前記押出し発泡機に注入する、方法。
- 物理的に発泡することは、前記非発泡体を超臨界流体中に1から120分間含浸し、次いで、排気操作を実行することによってなされる、請求項15に記載の方法。
- 請求項1~14のいずれか一項に記載のポリマー組成物から作製された発泡体。
- 複数のセルを含み、SEM(走査型電子顕微鏡)観察により、以下:
セルサイズ分布は40 μmから135 μmの範囲にあること;
セルのアスペクト比は1から2.5の範囲にあること;
セルの数は、当該発泡体の100 μm x 100 μm断面あたり1から10であること;および
当該発泡体の密度は0.2 g/cm3以下であること
前記発泡体の落下ボールリバウンド値は35%以上かつ40%未満であること
で特徴付けられる、請求項19に記載の発泡体。 - 前記発泡体は、前記非発泡体を超臨界流体に1から120分間含浸し、次いで、排気操作を実行することによって得られ、前記非発泡体は前記ポリマー組成物から作製される、請求項20に記載の発泡体。
- 請求項19~21のいずれか一項に記載の発泡体で作製されたパーツ。
- 前記発泡体を接合することによって形成された、請求項22に記載のパーツ。
- スポーツ関連アクセサリー、靴材料、ヘルスケア材料、自動車またはモーターサイクル部品、または日用品に用いる、請求項22に記載のパーツ。
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