Process for producing lactic acid polymers and a process for the

Details Process for producing lactic acid polymers and a process for the Process for producing lactic acid polymers and a process for the

1995-05-05

1996-11-12

Dodson, Shelley A.

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

Synthetic resins

From carboxylic acid or derivative thereof

524755, 524784, 525408, 525411, 525415, 528271, 528274, 528275, 528283, 528357, 528361, 528480, C08G 6308

Patent

active

055741290

ABSTRACT:
A process for producing polylactic acid includes the steps of polycondensing lactic acid to a lactic acid prepolymer having a weight-average molecular weight of 10,000-50,000 in a batch-type polymerization reactor, and polycondensing the lactic acid prepolymer to lactic acid polymer having a weight-average molecular weight of at least 100,000 by means of a screw-type extruder.

REFERENCES:
patent: 5357034 (1994-10-01), Fridman et al.
patent: 5444143 (1995-08-01), Ohta et al.

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