| abstract |
(57) [Summary] [Structure] A unit containing 20 to 90 mol% of the unit represented by the following (1) and / or (2), and measured at 25 ° C. as a solution of 0.1 g / dl in 1N saline solution. A cationic polymer flocculant having an amidine structure having a reduced viscosity value of 0.1 to 10 dl / g. [Chemical 1] (In the formula, R 1 and R 2 represent a hydrogen atom or a methyl group, and X − represents an anion.) [Effect] It exhibits excellent performance as a flocculant. |