Patent ID: 8748543

Claim:
A polylactic acid film obtained by melt extruding polylactic acid (A) and stretching monoaxially to more than 1.00 times and less than 2 times or stretching biaxially at an area draw ratio of less than 4 times wherein the polylactic acid (A) is prepared by melt kneading together (i) polylactic acid (B) which comprises an L-lactic acid unit as the main ingredient and 0 to 10 mol % of a component excluding the L-lactic acid unit and polylactic acid (C) which comprises a D-lactic acid unit as the main ingredient and 0 to 10 mol % of a component excluding the D-lactic acid unit in a (B/C) weight ratio of 10/90 to 90/10, (ii) 0.01 to 5 parts by weight of triclinic inorganic particles (D) and/or 0.01 to 5 parts by weight of a phosphoric acid ester metal salt (E) based on 100 parts by weight of the polylactic acid (B) and (C), and (iii) 0.01 to 10 parts weight of a carboxyl group sealing agent based on 100 parts by weight of the polylactic acid (B) and (C), and wherein (a) the polylactic acid film has a stereocomplex crystal rate (S) defined by the following equation (i) of 90% or more: S ={(Δ Hmsc /(Δ Hmsc+ΔHmh )}×100 (i) (in the above equation, ΔHmh is the melting enthalpy of a low-melting point crystal melting peak at a temperature lower than 190° C. obtained by differential scanning calorimeter (DSC) measurement and ΔHmsc is the melting enthalpy of a high-melting point crystal melting peak at a temperature of 190° C. or higher obtained by DSC measurement), (b) a haze of 10% or less, and (c) a haze change of 5% or less after it is heated at 140° C. for 10 minutes.