Polyhalogenous polyester preparation

Claim 1

A PROCESS FOR PREPARING A POLYESTER CHARACTERIZED BY THE PRESENCE OF PENDANT HALOALKYL GROUPS WHICH HAVE UP TO TWO CARBON ATOMS AND WHICH CONTAIN AT LEAST TWO HALOGEN ATOMS, COMPRISING HEATING AND CONTACTING IN THE PRESENCE OF A CATALYST SYSTEM COMPRISING THE REACTION PRODUCT OBTAINED BY HEATING AND CONTACTING ALUMINUM ISOPROPOXIDE WITH A CARBOXYLIC ACID (1) A MEMBER SELECTED FROM THE GROUP CONSISTING OF (A) DICARBOXYLIC ACID ANHYDRIDES, (B) DICARBOXYLIC ACIDS, AND (C) MIXTURES OF (A) WITH (B), AND (2) A VICINAL ALKYLENE OXIDE, SELECTED FROM THE GROUP CONSISTING OF (A) A VICINAL ALKYLENE OXIDE CONTAINING FROM THREE TO FOUR CARBON ATOMS, INCLUSIVE, AND HAVING AN ALKYL GROUP ATTACHED TO A CARBON ATOM OF THE OXIRANE RING, SAID ALKYL GROUP HAVING UP TO TWO CARBON ATOMS AND CONTAINING AT LEAST TWO HALOGEN ATOMS, EACH HALOGEN HAVING AN ATOMIC WEIGHT OF NINETEEN TO EIGHTY, INCLUSIVE, AND (B) AN ALKYLENE OXIDE AS DEFINED IN (A) TOGETHER WITH A VICINAL ALKYLENE OXIDE, SELECTED FROM THE GROUP CONSISTING OF SATURATED ALKYLENE OXIDES AND ALKYLENE OXIDES WHICH ARE FREE FROM OTHER THAN AROMATIC UNSATURATION, HAVING AS A SUBSTITUENT ATTACHED TO ACARBON ATOM OF THE OXIRANE RING A MEMBER OF THE GROUP CONSISTING OF HYDROGEN AND AN ALKYL GROUP, SAID ALKYL GROUP HAVING UP TO TWO CARBON ATOMS AND CONTAINING FROM ZERO TO ONE HALOGEN ATOM, INCLUSIVE, ANY HALOGEN HAVING AN ATOMIC WEIGHT OF NINETEEN TO EIGHTY, INCLUSIVE, SAID ALKYLENE OXIDE AS DEFINED IN (A) BEING PRESENT IN AMOUNT OF AT LEAST ABOUT FIFTY PERCENT BY WEIGHT OF THE TOTAL AMOUNT OF ALKYLENE OXIDE AS DEFINED IN (B).