Patent ID: 7223815
Filing Date: 2007-05-29
Classification: C08G,C08J,C08L

Abstract:
1. A polylactic acid composition comprising a polylactic acid and a modifier for a polylactic acid, wherein the modifier comprises a block polymer (C) having a polymer block (A) satisfying relationship (1): wherein σ represents a solubility parameter value of a polymer block; ρ represents a density value of a polymer block; and the value of σ/ρ is obtained in accordance with σ/ρ=ΣFi/M, wherein Fi represents a molar attraction constant of the chemical group and M represents a molar molecular weight per repeating unit; and a polymer block (B) satisfying relationship (2): wherein σ and ρ have the same meanings as described above, wherein each of said polymer (A) and said polymer (B) is independently a polymer block selected from the group consisting of a polyester block, a polyether block, and a polyhydroxycarboxylic acid block, and said block polymer (C) has a glass transition temperature of 0° C. or lower.