PARTLY FLUORINATED CARBOXYLIC ACIDS AND DERIVATIVES THEREOF, PROCESSES FOR THEIR PREPARATION AND THEIR USE

摘要

of the disclosure: Partly fluorinated carboxylic acids and derivatives thereof, processes for their preparation and their use Partly fluorinated carboxylic acids, in particular a partly fluorinated dicarboxylic acid, its acid chloride and partly fluorinated tetracarboxylic acids having various fluorine contents and their dianhydrides are obtained by atmospheric oxidation in an acid medium and at elevated temperature in the presence of a catalyst mixture of at least two heavy metal compounds and bromide ions. The compounds are used for the preparation of polycondensates and linear polycarboxylic acid amides and -carboxylic acid esters.