Process for preparing polylactic acid

Details Process for preparing polylactic acid Process for preparing polylactic acid

1997-03-17

1998-10-13

Truong, Duc

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

Synthetic resins

From carboxylic acid or derivative thereof

528310, 528322, 528357, 528358, 528361, C08G 6308

Patent

active

058213279

ABSTRACT:
The polymerization reaction is conducted by heating a lactide, a cyclic imide compound (e.g. succinimide, etc.) and a polymerization catalyst (e.g. tin octylate, etc.) at 100-190.degree. C. with stirring under a nitrogen gas flow. It is preferred that an amount of the cyclic imide compound is from 1 to 35% by mole based on the lactide. Even if an amount of the polymerization catalyst is small, e.g. 0.00001-0.1 mole %, based on the lactide, polylactic acid can be efficiently prepared. It is possible to avoid remains of the catalyst in the polymer and coloring of the polymer.

REFERENCES:
patent: 2857274 (1958-10-01), Land et al.
patent: 2857276 (1958-10-01), Land et al.
patent: 4057537 (1977-11-01), Sinclair

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