Patent ID: 9505713
Filing Date: 2016-11-29
CPC Classification: C07C,C08F,D06M

Claim Text:
1. High-purity sodium p-styrenesulfonate with an excellent hue having an APHA value of a 15 wt % aqueous solution of sodium p-styrenesulfonate and poly(sodium p-styrenesulfonate)≦100, in which the iron content in sodium p-styrenesulfonate is less than 3.00 μg/g, the sodium bromide content is less than 2.50 wt %, and the peak area ratios of (a) sodium o-styrenesulfonate, (b) sodium p-β-bromoethylbenzenesulfonate, (c) sodium m-styrenesulfonate, (d) sodium bromostyrenesulfonate and (e) sodium p-β-hydroxyethylbenzenesulfonate, which are determined by high-performance liquid chromatography (HPLC), are (a) ≦0.40%, (b) ≦4.00%, (c) ≦8.00%, (d) ≦0.10% and (e) ≦0.80%, respectively (provided that the sum of peak areas of sodium p-styrenesulfonate and (a) to (e) is 100).