The catalyst can use for polycondensation of lactic acid directly.
When use direct catalyst for PLA, Sn compounds become unstable to water and low catalyst activity happen with sulfonic acids.
The advantages of the catalyst is below.
?Direct poly-condensation from lactic acid
?Synthesis of new-type bio-material (ex. net-work poly-lactic acid, star poly-lactic acid, co-polymer with amino acids and co-polymer with carbohydrate derivatives etc.)

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