Tape joint compounds with CMC thickener system
AssigneeHercules Incorporated
InventorThomas J. Podlas
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Abstract
CMC with CMDS greater than or equal to 0.76, optionally with a non-ionic co-thickener or a CMC with CMDS less than 0.75 is used as both the rheology modifier and partial clay substitute in tape joint compounds. This significant reduction of clay level is sufficient to eliminate most of the negative characteristics of clay in joint compound.
Claims38
A ready-mix, drying type tape joint compound composition comprising a binder, a thickener system, a filler, water, and a biocide, wherein the thickener system comprises an uncrosslinked sodium carboxymethylcellulose (CMC) with a degree of substitution (DS) lower limit of 0.76 and a degree of polymerization (DP) lower limit of 1,000 and is present in an amount of 0.01 to 0.6% by weight based on the total weight of the composition.
Dependencies are inferred from the claim text.