Powdery water-soluble cationic polymer composition
AssigneeSolenis Technologies, L.P.
InventorsPatric Bierganns, Markus Broecher
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Abstract
The invention relates to powdery, water-soluble, cationic polymer composition comprising at least two different cationic polymers, namely a first cationic polymer and a second cationic polymer, which differ in chemical nature and molecular weight, as well to a method for producing such powdery, water-soluble, cationic polymer composition, and to its use for promoting flocculation in solid-liquid separation, for example as a retention aid in paper manufacture, and in sludge dewatering/wastewater purification.
Claims7
A powdery water-soluble cationic polymer composition comprising a first cationic polymer and a second cationic polymer;
- wherein the second cationic polymer is formed by non-radical polymerization;
- wherein the second cationic polymer has a weight-average molecular weight lower than 1 million g/mol;
- wherein the second cationic polymer is polyamine selected from the group consisting of poly(dimethyl-amine(co)epichlorohydrin) and poly(dimethylamine-co-epichlorohydrin-co-ethylene-diamine),
- wherein the first cationic polymer is formed in the presence of the second cationic polymer by radical adiabatic gel polymerization of an aqueous composition comprising a radically polymerizable cationic monomer, a radically polymerizable nonionic monomer, and the second cationic polymer, wherein the cationic monomer comprises 20 wt-%+/−15 wt-% of the monomer units of first cationic polymer and the nonionic monomer comprises 80 wt-%+/−15 wt-% of the monomer units of the first cationic polymer,
- wherein the weight ratio of the first cationic polymer to the second cationic polymer in the composition is within the range of from about 93:7 to about 87:13, and
- wherein 999 grams of water having 1 gram of the composition dispersed therein contains not more than 5 ml/l insoluble after stirring at 300 r.p.m. for 60 minutes.
A powdery water-soluble cationic polymer composition comprising a first cationic polymer and a second cationic polymer;
- wherein the second cationic polymer is formed by non-radical polymerization;
- wherein the second cationic polymer has a weight-average molecular weight lower than 1 million g/mol;
- wherein the second cationic polymer is polyamine selected from the group consisting of poly(dimethyl-amine(co)epichlorhydrin) and poly(dimethylamine-co-epichlorohydrin-co-ethylene-diamine), and
- wherein the first cationic polymer is formed in the presence of the second cationic polymer by radical adiabatic gel polymerization of an aqueous composition comprising a radically polymerizable cationic monomer, a radically polymerizable nonionic monomer, and the second cationic polymer, wherein the cationic monomer comprises 20 wt-%+/−10 wt-% of the monomer units of first cationic polymer and the nonionic monomer comprises 80 wt-%+/−10 wt-% of the monomer units of the first cationic polymer,
- wherein the weight ratio of the first cationic polymer to the second cationic polymer in the composition is within the range of from about 93:7 to about 87:13, and
- wherein 999 grams of water having 1 gram of the composition dispersed therein contains not more than 3 ml/l insoluble after stirring at 300 r.p.m. for 60 minutes.
Dependencies are inferred from the claim text.