Preparation process of the formed product of L-lactic acid base polymer

摘要

A formed product which has a thickness of 0.1~2 mm and a haze of 5%/2 mm or less and is degraded with ease in the natural environment is obtained by holding a transparent L-lactic acid base polymer sheet having an L-lactic acid proportion of 75% or more and a thickness of 0.2~2 mm under conditions where:(1) a holding temperature is in the range of 55~90° C.,(2) a holding time m1 (min) satisfies the formula:forming said sheet by adhering to the internal surface of a mold through vacuum suction, compressed air pressure or vacuum/air pressure under a condition where:(3) a mold temperature T2 is set in the range of from the glass transition temperature Tg of the L-lactic acid base polymer to the holding temperature T1, and taking out the formed product from the mold after reducing an internal temperature of the mold to less than Tg.