Resin composition,porous film produced therefrom and process for producing same

摘要

A resin composition which comprises 95 to 60 volume % of a resin mixture of 40 to 85 % by weight of a copolymer between D-hydroxybutyrate and D-hydroxyvalerate containing 8 to 15 mol % of D-hydroxyvalerate-derived monomer unit and 60 to 15 % by weight of poly- epsilon -caprlactone, and 5 to 40 volume % of an inorganic filler or fillers, a porous film produced from the resin composition and having a void volume of 10 to 70 %, and a process for producing the porous film are disclosed. The film can be produced by melting the resin composition, forming it into a film, and stretching the film in at least one direction. The porous film can easily be degraded by microorganisms. Examples of the inorganic filler include barium sulfate, with the particle size being preferably 0.1 to 10.0 mu m.