Composition comprising amphoteric polymeric flocculants

摘要: A composition is provided which comprises amphoteric polymers comprising, as constituent monomer units, a cationic unit, an anionic and optionally nonionic unit having 0.5% salted viscosity of 10 to 120 mPa·s, wherein said comprise first polymer satisfying the following expression (1) second (2) or third expressions (3) (4): Ca1/An1≧1 Ca2/An2<1 Ca3/An3≧1 |(Ca1−An1)−(Ca3−An3)|≧1.5 (4) Ca1 An1 respectively represent total mole number units in on condition that all converted be 100 mol; similar above, Ca2 An2, Ca3 An3, polymers. The excellent various flocculation dewatering performances for types sludge, particular, sludge high ratio excess can used process yield improvement papermaking process.