Polymeric blend useful in thin-bed mortar compositions comprising a water-soluble cellulose ether and a water-insoluble, but water-dispersible polymer
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Feb 2, 1988
filing date -
Feb 2, 1988
priority date (Note) -
Expired
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Abstract
This invention is a polymer blend useful in thin-bed mortar compositions comprising a water-soluble cellulose ether and a water-insoluble, but water-dispersible, polymer. The water insoluble, but water-dispersible polymer can include an unneutralized polyacrylic acid that is lightly crosslinked or methylcellulose with a viscosity from about 50 cps to about 150,000 cps, provided the polymeric blend containing methylcellulose is employed in a medium that has a pH of about 12 or greater, although a pH of less than 12 is workable, but is dependent upon the methoxyl content of the methylcellulose. The polymeric blend extends the working time of the composition in which it is employed and because the blend has sag binding characteristics, it also functions as a sag resistance aid.
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