Patent · US Expired

Process for the manufacture of swellable cellulose ethers

US4075279A · kind A · utility

13Cited by

9References

3Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Arno Holst
Michael Kostrzewa · Wiesbaden, DE

Key dates

Filing date	Sep 23, 1976
Grant date	Feb 21, 1978
Priority date	—
Expiry date	Sep 23, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08B15/005
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

This invention relates to an improvement in the process for the manufacture of water-absorbing, but largely water-insoluble cellulose ethers, wherein cellulose is etherified with a halogen fatty acid in an alkaline medium to which organic solvents may be added, to such an extent that without a further reaction a water-soluble cellulose ether would be produced, and wherein, prior to, during, or after etherification, a further reaction is carried out with a cross-linking agent which is polyfunctional towards cellulose in an alkaline reaction medium, the improvement comprising that chips of regenerated cellulose film are used as cellulose.

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