JP4764171B2 - 樹脂発泡体及び発泡成形用樹脂組成物 - Google Patents
樹脂発泡体及び発泡成形用樹脂組成物 Download PDFInfo
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- JP4764171B2 JP4764171B2 JP2006001466A JP2006001466A JP4764171B2 JP 4764171 B2 JP4764171 B2 JP 4764171B2 JP 2006001466 A JP2006001466 A JP 2006001466A JP 2006001466 A JP2006001466 A JP 2006001466A JP 4764171 B2 JP4764171 B2 JP 4764171B2
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- foam
- starch
- foaming agent
- resin
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Description
低密度ポリエチレン(LDPE)(日本ポリエチレン(株)製,JF414A)、デンプン含有ポリエチレン(PE)(日立化成フィルテック(株)製,813PE,デンプン含有率20重量%)、ステアリン酸アミド、及びタルクを、表1に示す割合で用いて、押出機(50φ(第1ステージ)/60φ(第2ステージ))を用いて、第1ステージで混練溶融させつつ、表1に示す割合の発泡剤を注入した。さらに、第2ステージで、混合物をさらに均一に混練し、冷却しつつ、ダイから混合物を棒状25φに押出し、マンドレルで引き取って発泡体を得た。
Claims (12)
- オレフィン系樹脂とデンプン類とで構成された樹脂組成物が、少なくともイソブタンを含有する有機系物理発泡剤を用いて、発泡成形された発泡体。
- 有機系物理発泡剤の沸点が、発泡剤全体の平均として−40℃〜+15℃である請求項1記載の発泡体。
- 有機系物理発泡剤が、イソブタン単独で構成された発泡剤、又はイソブタンと、n−ブタン、n−ペンタン及びイソペンタンから選択された少なくとも一種とで構成された混合発泡剤であり、イソブタンを40重量%以上の割合で含む請求項1記載の発泡体。
- オレフィン系樹脂がポリエチレン系樹脂である請求項1記載の発泡体。
- デンプン類が、デンプン、エーテル化デンプン及びエステル化デンプンから選択された少なくとも一種である請求項1記載の発泡体。
- デンプン類とオレフィン系樹脂との割合(重量比)が、デンプン類/オレフィン系樹脂=1/99〜60/40である請求項1記載の発泡体。
- 発泡倍率が18〜90倍であり、密度が0.01〜0.05g/cm3である請求項1記載の発泡体。
- 独立気泡率が80%以上である請求項1記載の発泡体。
- 樹脂組成物が、さらに脂肪酸アミドを含有する請求項1記載の発泡体。
- オレフィン系樹脂とデンプン類とで構成され、少なくともイソブタンを含有する有機系物理発泡剤を用いて、発泡成形することにより請求項1記載の発泡体を形成するために使用される発泡成形用樹脂組成物。
- オレフィン系樹脂とデンプン類とで構成された発泡成形用樹脂組成物を、少なくともイソブタンを含有する有機系物理発泡剤を用いて、発泡成形し、請求項1記載の発泡体を製造する方法。
- オレフィン系樹脂とデンプン類とで構成された樹脂組成物を、少なくともイソブタンを含有する有機系物理発泡剤を用いて、発泡成形することにより発泡体の独立気泡率を向上させる方法。
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JP5876231B2 (ja) * | 2011-05-30 | 2016-03-02 | 学校法人東京理科大学 | 発泡形成用樹脂組成物の製造方法および製造された発泡形成用樹脂組成物を用いた樹脂発泡体の製造方法 |
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JPH05320400A (ja) * | 1992-05-19 | 1993-12-03 | Sekisui Chem Co Ltd | 熱可塑性樹脂発泡体の製造方法 |
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JP2000053792A (ja) * | 1998-08-05 | 2000-02-22 | Sanwa Kako Co Ltd | 生分解性樹脂発泡体及びその製造方法 |
JP2003011201A (ja) * | 2001-07-05 | 2003-01-15 | Minoru Hishinuma | 発泡成形体及びその製造方法 |
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