| abstract |
IN THE PRODUCTION OF HAOGEN-CONTAINING POLYARYL ESTERS BY THE POLYCONDENSATION OF HALOGEN-CONTAINING DISPHENOLS AND AROMATIC ACID DICHLORIDES IN THE PRESENCE OF A CATALYST COMPRISING A TETIARY AMINE, AN AID AMIDE OR MIXTURES THEREOF, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE CONDESATION IN THE PRESENCE OF ABOUT 0.001 TO 50 MOLEPERCENT BASED ON THE ACID DICHLORIDE, OF AT LEAST ONE ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM COMPOUNDS, AND OXIDES, CHLORIDES OR HYDROCHLORIDES OF CU, ZR, SN, TN, V, PB AND FE. THE CONDENSATION IS PREFERABLY EFFECTED IN SOLUTION USING AS ACTIVATED CUO, CUCI, ZRCI4, SNCL2, TICL4, COCI3, PBO, FE2O3 OR AN ALLOY OF MG, CU, ZR, SN, TI, V, PB OR FE. IN THIS MANNER HIGH MOLECULAR WEIGHT CAN BE ATTAINED IN SHORT REACTION TIMES. |