| 摘要 |
PROBLEM TO BE SOLVED: To obtain a compsn. for molded articles improved in mechanical properties and impact strength and excellent in disposability by incorporating polylactic acid, an aliph. polyester, and/or an aliph. polyester carbonate into the same. SOLUTION: This compsn. contains polylactic acid having a wt. average mol.wt. of 50,000-1,000,000, an aliph. polyester other than polylactic acid, and/or an aliph. polyester carbonate and further contains various additives. The compsn., after melt mixed at 100-250 deg.C, is injection molded to give a molded article having a bending strength of 30 MPa or higher and an Izod impact strength of 3 kJ/m2 or higher. The aliph. polyester carbonate is obtd. by reacting an aliph. dibasic acid with an aliph. dihydroxy compd. and/or a hydroxycarboxylic acid and reacting the resultant aliph. polyester oligomer having a number average mol.wt. of 10,000 or lower with 5-30 mol % carbonate compd. and has a wt. average mol.wt. of 100,000 or higher and a melt viscosity (190 deg.C, 60 kg-load) of 2,000-50,000 P.
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