Sulfonate grease improvement

The process of forming a non-Newtonian oil composition in the form of a grease comprising an overbased calcium sulfonate, solid particles of colloidally dispersed calcium carbonate in the form of calcite and calcium borate, which comprises the steps of (1) heating overbased calcium sulfonate, amphorous calcium carbonate and a converting agent comprising a fatty acid of twelve to twenty-four carbon atoms in an oleaginous vehicle under conditions favoring the formation of calcium carbonate crystals in the form of calcite crystals and (2) reacting said product of step 1 with components comprising a boric acid compound to develop the grease like properties.

A high performance calcium borate modified overbased calcium sulfonate/calcium carbonate complex grease comprising overbased calcium sulfonate, oleaginous vehicle, calcium carbonate in the calcite form, (a) a calcium borate and (b) a calcium soap of a soap forming aliphatic monocarboxylic acid containing at least twelve carbon atoms, said (a) and (b) ingredients being essentially homogeneously distributed through said complex grease, and at least a portion of the (b) component as a converting agent in the conversion of amorphous calcium carbonate to crystalline calcium carbonate in the form of calcite.

A Newtonian composition comprising overbased calcium sulfonate, amorphous calcium carbonate, a fatty acid of twelve to twenty-four carbon atoms in an oleaginous media.