PROCESS FOR THE PROVISION OF A PLANT EXTRACT CONTAINING...

Drug – bio-affecting and body treating compositions – Plant material or plant extract of undetermined constitution...

Reexamination Certificate

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Reexamination Certificate

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06955826

ABSTRACT:
A process for obtaining a plant extract containing condensed tannins, with astringent characteristics, and modified by copolymerization, produces a material suitable for the tanning and retanning of skins. The process includes adding water to a reactor, adding a copolymerization agent, adding thioglycolic acid and allowing to react, adjusting pH, mixing a powdered extract of a plant or tannin to a desired concentration, raising the temperature, adding sodium bisulfite, and keeping the reaction heated and at pressure for about 4 hours.

REFERENCES:
patent: 4579927 (1986-04-01), Patel et al.

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