| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene film having good hand tearing easiness. SOLUTION: A mixed resin layer (B) comprising a polypropylene resin and a petroleum resin or a terpene resin is laminated on at least one side of a polypropylene resin layer (A) whose crystallization temperature is lower than that of the polypropylene resin in the mixed resin layer (B) so that the thickness of the layer (B) is 5-60% of the total thickness of the film. The film, at least after being uniaxially stretched, is heat-treated at a temperature equal to or higher than a temperature by 10°C lower than the melting point of the layer (A) and lower than the melting point of the polypropylene resin mixed in the layer (B). The coefficient of static friction of the polypropylene film when each surface layer surface is superimposed is 0.45 or below. COPYRIGHT: (C)2005,JPO&NCIPI |
