| abstract |
(57) [Summary] [PROBLEMS] To provide a porous film which is excellent in moisture permeability, air permeability, hydrolyzability and flexibility, and whose mechanical properties such as tensile strength are not deteriorated with time, and a method for producing the same. Composition: Polylactic acid or lactic acid-hydroxycarboxylic acid copolymer 80 to 95% by weight, and 100% by weight of a polylactic acid resin composition containing 5 to 20% by weight of a plasticizer selected from triethyl acetylcitrate and tributyl acetylcitrate. Part of the powder, a mixture of 40 to 250 parts by weight of a fine powder filler having an average particle diameter of 0.3 to 4 μm is melt-cast and then stretched at least uniaxially by 1.1 to 10 times. Porous film and method for producing the same. |