| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain favorable flexibility and heat resistance in a polylactic acid resin composition. <P>SOLUTION: In the method for producing the polylactic acid resin composition, a mixture containing the polylactic acid resin and surface-treated inorganic powder is kneaded by the use of the same direction-engaging biaxial extruder while conditions 1-3 are satisfied. The condition 1: a first temperature setting zone which is provided to include a range of at least 6.3D-13D mm from the central position of the raw material supply port of a barrel and in which the set temperature of the barrel is (Tm+50)-(Tm+80)°C, and a conveyance element is provided in a screw; and a second temperature setting zone which is provided to include a range after at least 19.3D mm and in which the set temperature of the barrel is (Tm-20)-(Tm+40)°C are provided. In the condition 2, in a range of 13D-20.9D mm, a first kneading part which has a length of 1D-4D mm and in which a kneading element is provided in the screw is provided. In the condition 3, in a range after 20.9D mm, a second kneading part which has a length of 1D-4D mm and in which a kneading element is provided in the screw is provided. <P>COPYRIGHT: (C)2012,JPO&INPIT |
