POROUS FILM AND METHOD FOR PRODUCING THE SAME

To provide a porous film excellent in air permeability and further excellent in exterior appearance.SOLUTION: A porous film comprises a polyolefin resin and a styrenic thermoplastic elastomer. The styrenic thermoplastic elastomer has a sea-island structure that forms a domain in a matrix of the poly...

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Hauptverfasser:	TERAKAWA TORU, TANAKA ATSUNOBU, HIRAI MASANORI, NAKAJIMA MIKIHARU
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	To provide a porous film excellent in air permeability and further excellent in exterior appearance.SOLUTION: A porous film comprises a polyolefin resin and a styrenic thermoplastic elastomer. The styrenic thermoplastic elastomer has a sea-island structure that forms a domain in a matrix of the polyolefin resin and a variation coefficient of thickness in a film flow (MD) direction is 4.5% or less of average thickness.SELECTED DRAWING: Figure 1 【課題】透気性に優れると共に外観に優れた多孔質フィルムを提供すること。【解決手段】ポリオレフィン系樹脂及びスチレン系熱可塑性エラストマーを含有し、前記スチレン系熱可塑性エラストマーが前記ポリオレフィン系樹脂のマトリクス中にドメインを形成する海島構造を有し、フィルムの流れ（ＭＤ）方向の厚み変動率が平均厚みの４．５％以下である、多孔質フィルム。【選択図】図１