Method for the preparation of diglycidyl ether of tetrachlorobisphenol-a

Claim 1

THE METHOD FOR PREPARING A DIGLYCIDYL EHTER OF A TETRACHLOROBISPHENOL-A COMPOUND WHICH CONSISTS OF (A) HEATING A MIXTURE OF 1 MOLAR PORTION OF A TETRACHLOROBISPHENOL-A COMPOUND AND AT LEAST 2 MOLAR PORTIONS OF EPICHLOROHYDRIN TO A TEMPERATURE OF 50-95* C., ADDING THERETO IN A SINGLE CHARGE 0.05-0.40 EQUIVALENT OF ALKALI AND MAINTAINING THE REACTION MIXTURE AT REFLUX TEMPERATURE UNTIL ALL OF THE TETRACHLOROBISPHENOL-A COMPOUND IN THE REACTION MIXTURE HAS BEEN CONVERTED TO THE DI(BETA-HYDROXY-GAMMA-CHLORO-N-PROPYL) EHTER OF THE TETRACHLOROBISPHENOL-A COMPOUND, (B) DISTILLING ANY UNREACTED EPICHLOROHYDRIN FROM THE REACTION MIXTURE FROM STEP (A) AND (C) TREATING THE REACTION MIXTURE FROM STEP (B) WITH ALKALI TO FORM A DIGLYCIDYL ETHER OF A TETRACHLOROBISPHENOL-A COMPOUND; THE QUANTITY OF ALKALI EMPLOYED IN STEPS (A) AND (C) CONSTITUTING AT LEAST 2 EQUIVALENTS, SAID TETRA CHLOROBISPHENOL-A COMPOUND BEING SELECTED FROM THE GROUP CONAIATING OF 4, 4''-ISOPROPYLIDENBIS (2, 6-DICHLOROPHENOL), 2, 2''-ISOPROPYLIDENEBIS (4, 6''-DICHLOROPHENOL), 2, 4''-ISOPROPYLIDENE - 4, 6, 2'', 6''-TETRACHLORO-BIS-PHENOL AND MIXTURES THEREOF.