Composition comprising amphoteric polymeric flocculants

Details Composition comprising amphoteric polymeric flocculants Composition comprising amphoteric polymeric flocculants

2006-11-28

2006-11-28

Hruskoci, Peter A. (Department: 1724)

Compositions

Water-softening or purifying or scale-inhibiting agents

Plant or organic material containing

C162S168200, C162S168300, C210S728000, C524S922000

Reexamination Certificate

active

07141181

ABSTRACT:
A composition is provided which comprises amphoteric polymers comprising, as constituent monomer units, a cationic monomer unit, an anionic monomer unit, and optionally a nonionic monomer unit and having a 0.5% salted viscosity of 10 to 120 mPa·s, wherein said amphoteric polymers comprise a first amphoteric polymer satisfying the following expression (1) and a second amphoteric polymer satisfying the following expression (2) or a third amphoteric polymer satisfying the following expressions (3) and (4):in-line-formulae description="In-line Formulae" end="lead"?Ca1/An1≧1  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Ca2/An2<1  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Ca3/An3≧1  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?|(Ca1−An1)−(Ca3−An3)|≧1.5  (4)in-line-formulae description="In-line Formulae" end="tail"?wherein Ca1and An1respectively represent the total mole number of the cationic monomer units and the total mole number of the anionic monomer units in the first amphoteric polymer on a condition that the total mole number of all the constituent monomer units in the first amphoteric polymer is converted to be 100 mol; on a condition similar to the above, Ca2and An2, and Ca3and An3, respectively represent the total mole number of the cationic monomer units and the total mole number of the anionic monomer units in the second and third amphoteric polymers. The composition is excellent in various flocculation and dewatering performances for various types of sludge, in particular, for sludge high in ratio of excess sludge, and can be used for process yield improvement in papermaking process.

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