Gasoline motor fuel

Claim 1

A GASOLINE MOTOR FUEL COMPRISING A MAJOR AMOUNT OF A HYDROCARBON MIXTURE BOILING IN THE GASOLINE RANGE AND CONTAINING TETRAETHYL LEAD IN AN AMOUNT NORMALLY TENDING TO CAUSE PREIGNITION OF SAID FUEL IN THE COMBUSTION CHAMBER OF A SPARK IGNITION, RECIPROCATING INTERNAL COMBUSTION ENGINE, AND A MINOR AMOUNT, SUFFICIENT TO INHIBIT SUCH PREIGNITION, OF A REACTION PRODUCT OF (A) AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY SECONDARY AND TERTIARY ALKYL, ALKENYL AND ALKYLOL MONOAND DIAMINES WHOSE SUBSTITUENTS EACH CONTAIN 2 TO 22 CARBON ATOMS, AND (B) AN ANHYDRIDE PREPARED BY REACTING A PARTIALLY ESTERIFIED ORTHOPHOSPHORIC ACID THAT CONTAINS 1 TO 2 ORGANIC SUBSTITUENTS PER MOLECULE, AT LEAST ONE OF WHOSE SUBSTITUENTS IS A HYDROCARBON RADICAL CONTAINING 5 TO 22 CARBON ATOMS, AND THE OTHER SUBSTITUENT OF WHICH WHEN PRESENT IS A HYDROCARBON RADICAL CONTAINING 1 TO 22 CARBON ATOMS, WITH A BORYLATING AGENT SELECTED FROM THE GROUP CONSISTING OF BORIC ACID, BORIC OXIDE, AND AN ANHYDRIDE OF BORIC OXIDE AND AN ALIPHATIC MONOCARBOXYLIC ACID, IN THE RATIO OF ABOUT 0.5 TO ABOUT 6 MOLES OF SAID PARTIALLY ESTERIFIED ORTHOPHOSPHORIC ACID PER MOLE OF BORYLATING AGENT, UNDER CONDITIONS CONDUCTIVE TO ANHYDRIDE FORMATION, SAID AMINE AND SAID ANHYDRIDE BEING REACTED IN THE PROPORTION RANGE OF ABOUT 0.5 TO ABOUT 2 EQUIVALENTS OF ANHYDRIDE PER EQUIVALENT OF AMINE.