Patent · US Expired

Process for the manufacture of absorbent, modified starch ethers and their use

US4117222A · kind A · utility

35Cited by

7References

5Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Arno Holst
Michael Kostrzewa · Wiesbaden, DE
Gerhard Buchberger · Niedernhausen, DE

Key dates

Filing date	Jul 28, 1977
Grant date	Sep 26, 1978
Priority date	—
Expiry date	Jul 28, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08B31/006
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

This invention relates to an improvement in the process for the manufacture of modified starch ethers in which, prior to, during, or after etherification, a reaction with a modifying agent is conducted in a wet alkaline medium, the improvement comprising that, if etherification were the only reaction conducted, an at least preponderantly water-soluble starch ether would be formed, and the modification results in an absorbent modified starch ether more than 40 per cent by weight of which is insoluble in water.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.