Processes for preparing polymers of the formula
##STR1##
wherein m is 0 or 1, X is chlorine, bromine, or iodine, and n, e, and f are
each, independently of the others, integers wherein e may be 0 and n and f are
each at least 1 by providing a first reaction mixture containing a first solvent,
a compound of the formula
##STR2##
wherein Y is a chlorine or fluorine atom, a compound of the formula
##STR3##
and optionally, a compound of the formula
##STR4##
heating the first reaction mixture and removing generated water therefrom,
thereby forming an intermediate polymer of the formula
##STR5##
providing a second reaction mixture containing a second solvent, the intermediate
polymer, and a N-halosuccinimide, wherein the halogen atom in the N-halosuccinimide
is the same as the halogen atom that is X; and heating the second reaction mixture,
thereby forming the polymer.
