Manufacture of ketone diarylamine condensation products

Claim 1

IN A METHOD OF MANUFACTURING A COMPOSITE ACETONE-DIPHENYLAMINE CONDENSATE BY AUTOCLAVING ONE MOLECULAR PROPORTION OF THE DIPHENYLAMINE AND IN EXCESS OF ONE MOLECULAR PROPORTION OF THE ACETONE IN THE PRESENCE OF AT LEAST ONE HALOGEN-CONTAINING CATALYST SELECTED FROM THE CLASS CONSISTING OF HALOGEN, HYDROGEN HALIDES, AND HALIDE OF IRON, ALUMINUM, TIN, ZINC, NICKEL, ANTIMONY, BISMUTH, COBALT, COPPER AND MANGANESE, THE HALOGEN IN EACH CASE BEING A MEMBER OF THE GROUP CONSISTING OF BROMINE AND IODINE, THE IMPROVEMENT WHICH CONSISTS IN CARRYING OUT THE SAID REACTION, IN WHICH THE DIPHENYLAMINE AND THE ACETONE ARE THE SOLE ORIGINAL REACTANTS, AT A TEMPERATURE SUBSTANTIALLY ABOVE 250* C. BUT NOT ABOVE 310* C., FOR FROM 3 TO 10 HOURS, AND FORMING A COMPOSITE CONDENSATE WHICH WHEN FREE OF EXCESS UNREACTED ACETONE, AND WATER, HAS A VISCOSITY FROM 5 TO 100 POISES AT 30* C. AND A DIPHENYLAMINE CONTENT RANGING FROM ABOUT 10 TO ABOUT 20%.