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US 5,385,607 AGranted
Water-soluble sulphoalkyl hydroxyalkyl derivatives of cellulose and their use in gypsum- and cement-containing compounds
AssigneeWolff Walsrode AG
InventorsRene Kiesewetter, Klaus Szablikowski, Werner Lange
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Abstract
The invention relates to a new class of water-soluble ionic cellulose derivatives and their use as additive for gypsum- and cement-containing compounds.
Claims2
A water-soluble, ionic, tertiary cellulose ether comprising cellulose etherified with
- (i) sulphoalkyl radicals with a degree of substitution (DS) of 0.001 to 0.6 and
- (ii) at least two radicals selected from the group consisting of hydroxyalkyl, alkoxyhydroxyalkyl, 3-alkoxy-2-hydroxyalkyl, aryl and arylalkyl radicals.
Dependencies are inferred from the claim text.