Process for preparing polyhydroxycarboxylic acid

Details Process for preparing polyhydroxycarboxylic acid Process for preparing polyhydroxycarboxylic acid

1994-05-19

1995-08-08

Marquis, Melvyn I.

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

Synthetic resins

From carboxylic acid or derivative thereof

528354, 528357, C08G 6306

Patent

active

054400082

ABSTRACT:
A process for preparing polyhydroxycarboxylic acid by conducting dehydration polycondensation of hydroxycarboxylic acids in the presence or absence of a catalyst and in the presence or absence of an organic solvent, comprising using a vertical high viscosity reactor during all or a portion of the dehydration polycondensation steps and conducting hot polycondensation while separating and removing low boiling components. The process can provide high molecular weight polyhydroxycarboxylic acid with ease and cheaply in industry.

REFERENCES:
patent: 5310865 (1994-05-01), Enomoto et al.

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