Overbased carboxylate gels
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United States of America Patent
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Jul 6, 1999
Grant Date -
N/A
app pub date -
Jan 20, 1998
filing date -
Jan 20, 1998
priority date (Note) -
Expired
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Abstract
The present invention is directed to a process for preparing a gelled overbased calcium carboxylate which involves carbonating a carboxylic acid of 8 to 30 carbon atoms in the presence of a promoter system consisting of water and an alcohol of 1 to 8 carbon atoms, such that the mole ratio of alcohol to water is substantially constant and is such that the viscosity of the reaction mixture during carbonation step does not exceed 1 pascal second (1000 centipoise). This process prevents excessive thickening of the reaction mixture in a manufacturing unit during carbonation and affords ample time to complete the process of carbonation without premature crystallization of the calcium carbonate formed during overbasing.
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