Process for the preparation of fluorocarbon polymers containing carboxyl groups, and certain starting materials required for this, and the fluorosulfato compounds formed as intermediate products in the process

Abstract From the Canadian patent

Abstract of the disclosure:, Substantially non-crosslinked fluorocarbon polymers containing carboxyl groups are prepared starting from non-crosslinked and in some cases new fluorocarbon, polymers in which the linear macromolecules carry side chains containing the end group -CHFX (X is F or CF3). The starting polymers are first reacted with peroxodisulfuryl difluoride FSO2O-OSO2F to give the corresponding fluorosulfato derivatives containing the side chain end groups, (X is F or CF3). In the event that X is F these derivatives are then, converted into the corresponding carboalkoxy derivatives by means of an alcohol, the fluorosulfato group being split off, and these carboalkoxy derivatives …