| abstract |
[PROBLEMS] To provide excellent air permeability, excellent slipperiness and wrinkle resistance necessary for long winding properties in film production (film formation) process, and excellent heat resistance (low thermal shrinkage). A biaxially oriented microporous film having processability and printing characteristics, and a method for producing the same are provided. SOLUTION: It comprises 90 to 99.8% by weight of a polypropylene resin having a β crystal ratio of 50 to 99%, 0.2 to 10% by weight of a resin incompatible with the polypropylene resin, and a Gurley permeability of 5 to 10,000 sec. / 100cc, and the static friction coefficient μs when both surfaces of the film are overlapped is in the range of 0.2 to 2, and a method for producing the biaxially oriented microporous film. [Selection figure] None |