| 摘要 |
PURPOSE:To obtain the titled flexible film having uniformly distributed fine cells and beautiful pearly gloss, by using a raw material obtained by blending a highly flowable polypropylene with a highly flowable polyethylene, and stretching the raw material at a temperature of its melting point or below thereof. CONSTITUTION:A main constituent comprising 100pts.wt. polypropylene (A) whose MI2.16 is 20-60 when measured by ASTMD-52T method and 5-80pts.wt. polyethylene whose MI2.16 is 20-60 when measured by said method and a foaming agent (C) (preferably azodicarboxylic acid amides, etc.) that will be decomposed at a temperature higher than the melting points of the constituents (A), (B) are mixed to prepare a resin composition, and after the resin composition is extruded into a film, the film is stretched monoaxially or biaxially at a temperature of said melting points or below thereof to obtain the intended film. EFFECT:Atactic polypropylenes are not required. |
