Method for producing polylactic acid and corresponding device

Details Method for producing polylactic acid and corresponding device Method for producing polylactic acid and corresponding device

2005-04-05

2005-04-05

Teskin, Fred M (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S357000, C549S274000, C435S139000, C435S289100, C422S131000

Reexamination Certificate

active

06875839

ABSTRACT:
The invention relates to a method for producing polylactic acid, comprising the steps of obtaining lactic acid from starchy agricultural products by fermentation, ultrapurification of the lactic acid by ultrafiltration, nanofiltration and/or electrodialysis, concentration of the lactic acid and production of a prepolymer, cyclizing depolymerization to dilactide, purification of the dilactide, ring-opening polymerization of the dilactide and demonomerization of the polylactide.

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