| 摘要 |
PROBLEM TO BE SOLVED: To prepare a composition for producing foam capable of exhibiting excellent foaming property and moldability, land suitable for foaming by adding a thickener and a decomposition-type blowing agent to a biodegradable polyactic acid-based resin in a specific ratio. SOLUTION: This composition contains (A) 100 pts.wt. polylactic acid-based resin, (B) 0.01-20 pts.wt. thickener (e.g. a multivalent isocyanate, a polybasic acid anhydride, or the like) and (C) 0.1-20 pts.wt. decomposition-type blowing agent (e.g. an inorganic blowing agent such as sodium bicarbonate, an organic blowing agent such as azodicarbonamide). The composition is melt-foamed, and a polylactic acid-based foam or sheet both improved in foaming moldability is obtained. Melt tension in melt-foaming is sufficient and it is possible to produce molded foam in a high expansion ratio. |
