Patent ID: 11939550
Assignee: INFINEUM INTERNATIONAL LIMITED
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 7:
8. A method for making a package-stable overbased alkaline earth metal hydrocarbyl-substituted salicylate detergent comprising both carbonate and borate moieties, the method comprising the steps of:
providing an oil-soluble or oil-dispersible overbased but unborated alkaline earth metal hydrocarbyl-substituted salicylate detergent made by reacting a mineral oil solution of an acid with a stoichiometric excess of a neutralizing agent comprising an alkaline earth metal carbonate or bicarbonate, optionally in the presence of promoter, at a temperature from 60 to 200° C. for a sufficient period of time to have thereby formed the overbased but unborated alkaline earth metal hydrocarbyl-substituted salicylate detergent, which exhibits a basicity index of at least 3.5, a soap content of at least 330 mmol/kg and less than or equal to 500 mmol/kg, an alkaline earth metal content, measured according to ASTM D4951, of at least 7.0% by mass, and a TBN, according to ASTM D2896, of at least 240 mg KOH/g, wherein the alkaline earth metal comprises calcium and/or magnesium, wherein the overbased but unborated alkaline earth metal hydrocarbyl-substituted salicylate detergent comprises carbonate moieties, and wherein the hydrocarbyl substitution comprises 9 to 30 carbon atoms;
admixing said overbased but unborated alkaline earth metal hydrocarbyl-substituted salicylate detergent in an organic diluent medium comprising an aprotic hydrocarbon solvent and a C1-C4 primary alcohol but comprising no intentionally added water with a boron source at a temperature below 100° C. to form a reaction mixture;
heating the reaction mixture to a temperature from 105° C. to 225° C. at a heating rate below 3° C./min in a borating process to form a crude borated detergent product;
optionally, further adding additional aprotic hydrocarbon solvent, thereby still forming a crude borated detergent product; and
removing a significant portion of the diluent medium, as well as water, formed during the borating process, in order to form the overbased alkaline earth metal hydrocarbyl-substituted salicylate detergent according to claim 1.