Clay-free, asbestos-free and glass microbubble-free joint...

Details Clay-free, asbestos-free and glass microbubble-free joint... Clay-free, asbestos-free and glass microbubble-free joint...

C - Chemistry, Metallurgy

09

K

C09K 3/10 (2006.01) C04B 26/04 (2006.01) C04B 28/00 (2006.01)

Patent

CA 2065231

A clay-free, asbestos-free and glass microbubble-free joint compound containing an in-situ or associative thickener as a substitute for asbestos and any clay substitute therefor. In particular, these joint compounds contain no attapulgus clay thereby improving viscosity stability, crack resistance and shrinkage. The preferred in-situ thickener are acidic acrylate copolymers. It has been found that the in-situ thickeners should be used in combination with the normal cellulosic thickeners used in joint compounds instead of as replacements therefor. The joint compounds contain the usual fillers and latex emulsion binders, with at least about 50% by weight of the filler being selected from the group consisting of calcium carbonate, calcium sulfate dihydrate and calcium sulfate hemihydrate.

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