Powdery water-soluble cationic polymer composition
First Claim
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1. 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, andwherein 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.
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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.
8 Citations
7 Claims
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1. A powdery water-soluble cationic polymer composition comprising a first cationic polymer and a second cationic polymer;
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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, andwherein 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. - View Dependent Claims (2, 3, 4)
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5. A powdery water-soluble cationic polymer composition comprising a first cationic polymer and a second cationic polymer;
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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, andwherein 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. - View Dependent Claims (6, 7)
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Specification