The present invention provides a branched polyvinyl imidazoline acid salt which,
when used in waste water treatment, especially sewage treatment, forms flocs and
decreases the water content of a dehydrated cake, a polymeric flocculent comprising
the branched polyvinyl imidazoline acid salt, and a process for preparing the branched
polyvinyl imidazoline acid salt. The branched polyvinyl imidazoline acid salt has
a Huggins' constant k of 0.2 to 1.2 and an intrinsic viscosity []
of 2 to 20 based on measurements at 30 C. in a 0.1 mol/l aqueous solution
of sodium chloride.
