MODIFIED CELLULOSE ETHER WITH IMPROVED WORKABILITY FOR USE IN GYPSUM SMOOTHING MORTAR AND JOINT FILLER APPLICATIONS

摘要

The present invention provides additives for dry mix or tape joint compound compositions comprising one or more cellulose ether powders containing on its surface a polymeric additive chosen from polymeric colloidal stabilizers, polymeric fluidizers and combinations thereof. The additive is formed by methods of kneading at from 50 to 120° C. a wet cellulose ether mixture containing from 60 to 80 wt. % of water with from 0.1 to 10 wt. %, based on total cellulose ether solids, of a polymeric additive chosen from polymeric colloidal stabilizers, and polymeric fluidizers, and combinations thereof to form the additive; drying and grinding the additive; and, combining the additive with 0.1 to 20 wt. %, based on total cellulose ether solids, of a dry polyacrylamide.