| abstract |
(57) [Summary] [PROBLEMS] To provide a dispersant comprising a sulfonated styrene polymer and / or a salt thereof, which has not been obtained in the past, and which has less sulfone crosslinking. [Structure] Weight average molecular weight of 2,000 to 500,000 A dispersant comprising a sulfonated styrene polymer and / or a salt thereof, which has a ratio Mw / Mp of 0 and a weight average molecular weight (Mw) and a peak top molecular weight (Mp) of 0.5 to 1.7. . |