| 摘要 |
<p>PROBLEM TO BE SOLVED: To recover a lactide which is a reutilizable raw material for a lactic acid-based polymer from lactic acid-based polymer wastes, etc., by adding specific alcohols and a pyrolytic catalyst to the lactic acid-based polymer and carrying out the alcoholysis. SOLUTION: (B) Alcohols having >=170 deg.C boiling point under 7.5Torr pressure (e.g. a >=6C monohydric alcohol, a diol, a >=5C triol or a tetrol) and (C) a pyrolytic catalyst such as a compound containing tin as an element are added to (A) a lactic acid-based polymer such as a copolymer of a polyester comprising a diol and a dicarboxylic acid and a lactide or a polylactic acid and the resultant mixture is then heated under a reduced pressure in an inert gas stream to carry out the alcoholysis. Thereby, the buckbite reaction is conducted.</p> |
