Highly basic calcium carboxylate compositions and method of preparation

Abstract

Environmentally friendly, shelf-stable overbased calcium carboxylate compositions and their method of preparation are described. The subject compositions possess anti-oxidation and anti-wear properties superior to those associated with existing sulfonate compositions. The subject compositions are prepared by neutralizing a mixture of two different molecular weight aliphatic carboxylic acids or anhydrides in the presence of an aromatic or aliphatic hydrocarbon solvent; adding a mixture of calcium oxide and calcium hydroxide; adding methyl alcohol to promote the reaction; carbonating the mixture with carbon dioxide at temperatures between 80° F. and 120° F.; heating to 200°-250° F. and finishing carbonation; adding diluent oil to the crude product; clarifying the product in solvent; and removing the solvent.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 203,484, filed Dec. 22, 2008 and entitled, Highly Basic Calcium Carboxylate Compositions and Method Of Preparation.FIELD OF THE INVENTION[0002]The subject invention relates generally to motor oil and metal working compound additives, and more specifically to highly basic calcium carboxylate compositions having improved detergency, anti-oxidation and anti-wear properties.BACKGROUND OF THE INVENTION[0003]Overbased additives can be found in practically every motor oil on the market. These materials, also known as “highly overbased” or simply “overbased” additives have provided motor oil with detergency, anti-wear, anti-corrosion and anti-rust properties as well as extreme pressure protection. The most widely used overbased compositions are the highly basic salts of alkyarylsulfonic acids (metal sulfonates). The reason for the use and popularity of the so-called highly ...

AI Technical Summary

Benefits of technology

The invention provides highly stable and effective calcium carboxylate compositions with superior anti-oxidation and anti-wear properties. These compositions can be made from natural ingredients and are environmentally friendly. The compositions have various advantages such as being non-sulfur, non-phosphorous, and detergent. They also provide excellent solubility, low viscosity, low odor, and low color. The invention can be used as an anti-oxidation and anti-wear additive in motor oil formulations.

Problems solved by technology

As may be observed from the above molecular structure, zinc dialkyldithiophosphate compounds contain both sulfur and phosphorous, which can cause pollution, health problems and damage to catalytic converters.

However, there is also a concern that meeting this objective may necessitate a tradeoff of lower phosphorous and sulfur for much higher engine and machine wear.

Highly basic calcium carboxylates, also known as “highly overbased” or simply “overbased” calcium carboxylates or soaps, are well known in the motor oil and metal working industries, but heretofore have not been known to possess the same degree of stability, anti-wear and anti-corrosion capabilities as the above mentioned products.

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