Detergent-dispersant additives for lubricating oils of the sulphurized and superalkalized alkaline earth alkylsalicylate-alkylphenate type
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United States of America Patent
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Sep 18, 2001
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N/A
app pub date -
Jul 21, 1999
filing date -
Mar 17, 1994
priority date (Note) -
Expired
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Abstract
Dispersant detergent additives for lubricating oils prepared by neutralization, carboxylation, sulfurization-overalkalinization, carbonation, distillation, filtering and degassing from alkyl phenols containing 35-85% by weight of linear alkyl substituents. The process does not require, during the neutralizing phase, the presence of a third solvent, which, by forming an azeotropic mixture with water promote the elimination of water arising from the neutralizing reaction. The additives of the invention have improved stability to hydrolysis and improved dispersion properties, improved compatibility and improved foaming properties.
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