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AssigneeTexaco Inc.
InventorsRegis Joseph Pellet, Paul Otto Fritz, Leonard Sherman Bartley JR.
Estimating the term…
The present invention comprises an improved antifreeze coolant composition with certain additives that serve to increase the thermal stability of the glycol component of a glycol/water coolant composition and to reduce the tendency of the glycol component to degrade under elevated thermal conditions. These additives comprise organic compounds with a carboxylic acid moiety and a hydroxyl moiety, and also tricarballylic acid. Another aspect of this invention concerns a method for improving the stability of the glycol component of a glycol/water coolant composition in engine cooling/heating systems by formulating a glycol/water coolant composition with the thermal stability additive to form an improved coolant composition, and contacting the engine cooling/heating system with the improved coolant composition.
An antifreeze coolant composition comprising water and a glycol in a weight ratio of about 95:5 to about 5:95 respectively, and containing about 0.01 weight % to about 5.0 weight % of a thermal stabilizing additive adapted to improve the high temperature glycol stability of said composition, said additive selected from the group consisting of at least one organic compound containing a carboxylic moiety and a hydroxyl moiety, tricarballylic acid, and mixtures thereof.
In a method for improving the high temperature glycol stability of an antifreeze coolant composition comprising water and glycol in a weight ratio of about 95:5 to about 5:95, respectively, the improvement which comprises contacting said antifreeze coolant composition with about 0.01 weight % to about 5.0 weight % of at least one thermal stability improving additive selected from the group consisting of at least one organic compound containing a carboxylic moiety and a hydroxyl moiety, tricarballylic acid, and mixtures thereof.
A method for preparing an improved high temperature glycol stable antifreeze coolant composition, comprising:
Dependencies are inferred from the claim text.