Method for recovering lactide from high-molecular weight polylac

Details Method for recovering lactide from high-molecular weight polylac Method for recovering lactide from high-molecular weight polylac

1996-09-13

1998-03-17

Owens, Amelia

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31900

Patent

active

057288470

ABSTRACT:
A method for recovering lactide from a high-molecular weight polylactic acid, comprising the steps of: (a) heat-treating a high-molecular weight polylactic acid to a temperature equal to or higher than a melting point of the polylactic acid to be treated in the presence of a catalyst comprising one or more metals selected from elements of Group IA, Group IVA, Group IVB, and Group VA of the Periodic Table, or compounds thereof; and (b) reducing a pressure to equal to or less than a vapor pressure of lactide at said temperature, to thereby distill and recover the produced lactide.

REFERENCES:
patent: 4057537 (1977-11-01), Sinclair

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