POROUS FILM AND MANUFACTURING METHOD THEREFOR

• Main Authors: HIROTA MASAYUKI, YAMAMURA GOHEI, SUEOKA MASANORI, HAMAZAKI RISA, AOYAMA SHIGERU
• Format: Patent
• Language: English; Japanese
• Published: 30.04.2015
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PROBLEM TO BE SOLVED: To provide a porous film mainly containing a biodegradable resin, good in balance of contractility resistance with time and fracture point elongation, and excellent in moisture permeability.SOLUTION: There is provided a porous film containing a biodegradable resin (A), a filler (B) of 1 to 70 mass% in 100 mass% of all components of the porous film, having porosity of 5 to 80%, and elongating in only one direction. Hereafter a direction of elongation is referred to as an elongation direction and a direction orthogonal to the elongation direction is referred to as an orthogonal direction. The porous film has thermal shrinkage percentage in the elongation direction of 0 to 10%, thermal shrinkage percentage in the orthogonal direction of -5 to 5%, and fracture point elongation in the orthogonal direction of 15% or more. 【課題】主に生分解性樹脂からなり、耐経時収縮性と破断点伸度のバランスが良好であり、透湿性に優れた多孔フィルムの提供。【解決手段】生分解性樹脂（Ａ）を含み、多孔フィルムの全成分１００質量％中に、充填剤（Ｂ）を１〜７０質量％含み、空孔率が５〜８０％であり、一方向のみに延伸されており（以下、延伸された方向を延伸方向といい、延伸方向に直交する方向を直交方向という）、延伸方向の熱収縮率が０〜１０％であり、直交方向の熱収縮率が−５〜５％であり、直交方向の破断点伸度が１５％以上であることを特徴とする、多孔フィルム。【選択図】図１