Method for the production of low-viscous water soluble cellulose ethers
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United States of America Patent
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Sep 6, 2005
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N/A
app pub date -
Nov 15, 1999
filing date -
Nov 27, 1998
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Expired
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Abstract
A process for preparing low-viscosity water-soluble cellulose ethers by the oxidative decomposition of higher-viscosity cellulose ethers with hydrogen peroxide is described. The process involves: (a) forming, under conditions of intensive mixing and at temperatures of 65-125° C., a mixture of, (i) one or more higher-viscosity cellulose ethers, and (ii) an aqueous solution of hydrogen peroxide, the proportions of the mixture being selected in such a way that the hydrogen peroxide content is 0.1-10 wt. % in relation to the dry cellulose ether, the solids content of the mixture is at least 25 wt. % in relation to the total weight of the mixture; and (b) agitating continuously the mixture of step (a) at temperatures of 65-125° C. until at least approximately 90% of the hydrogen peroxide has been spent.
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