Patent ID: 8168723

Claim:
Brominated anionic styrenic polymer wherein said polymer is formed with a total bromination time of 20 minutes or less and said polymer having (i) a bromine content of at least about 66 wt %, (ii) a GPC weight average molecular weight in the range of about 8000 to about 50,000, (iii) an initial Hunter Solution ΔE Color Value in the range of above zero to about 1.50, and (iv) a reduced percentage of aromatic rings with ortho-bromine substitution as determined by proton NMR so that the brominated anionic styrenic polymer has when molten and under pressure a measurable flow rate that is higher than brominated anionic styrenic polymers that (1) are made by polymerization of the same monomer or from the same styrenic monomers in the same proportions using the same kind of anionic polymerization initiator but with a total bromination time of 35 minutes or more; (2) have a bromine content above 66 wt % and differ from the bromine content of said brominated anionic styrenic polymer having characteristics (i), (ii), and (iii) by no more than 1.5 wt %; and (3) have a GPC weight average molecular weight that differs from the average GPC weight average molecular weight of the two brominated anionic styrenic polymers being compared by no more than 7.5%.