Polyhydroxycarboxylic acid and purification process thereof

Details Polyhydroxycarboxylic acid and purification process thereof Polyhydroxycarboxylic acid and purification process thereof

1993-10-01

1995-01-31

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528357, 528361, C08G 6308

Patent

active

053860047

ABSTRACT:
A purification process of a polyhydroxycarboxylic acid for efficiently removing a catalyst with a simple method from solid polyhydroxycarboxylic acid by bringing the solid polyhydroxycarboxylic acid which is obtained by a catalytic reaction and has an inherent viscosity of 0.1.about.5.0 dl/g into contact with an acid substance in the presence of a hydrophilic organic solvent. Also disclosed is a polyhydroxycarboxylic acid prepared by direct dehydration polymerization having an extremely reduced content of residual catalyst.

REFERENCES:
patent: 4447645 (1984-05-01), Donohue et al.
patent: 4810775 (1989-03-01), Bendix et al.

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