Patent ID: 7632893
Filing Date: 2009-12-15
Classification: C08F

Abstract:
1. A process of preparing brominated anionic styrenic polymer, which process is conducted as a continuous process and which process comprises maintaining in a reaction zone, reaction mixture continuously formed from (i) a brominating agent, (ii) a solution of anionic styrenic polymer in a solvent, and (iii) aluminum halide catalyst in which the halogen atoms are bromine or chlorine with at least one such halogen atom being a bromine atom, in which (i), (ii), and (iii) are fed as at least two separate feeds in which (i) and (ii) are not fed as a mixture, at one or more temperatures in the range of −20 to +20° C., said mixture being continuously proportioned so that bromination of polymer occurs to form a brominated anionic styrenic polymer having a bromine content of at least about 60 wt %, and terminating the bromination of polymer in reaction mixture continuously exiting from the reaction zone in a bromination time of 20 minutes or less, and wherein the brominated anionic styrenic polymer formed in the process has an initial Hunter solution ΔE Color Value of 3 or less.