Cellulose particles, method for producing them and their use
AssigneeTFM Handels-Aktiengesellschaft
InventorsJorg Oberkofler, Thomas Moser, Anton Schmalhofer, Jeffrey F. Spedding
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Abstract
Cellulose particles are provided which have cationic groups even in the interior.
Claims27
A method for producing cellulose particles comprising cationic groups, wherein the concentration of cationic groups increases or is at least constant from the external surface of the particles to the interior of the particles, and the concentration of cationic groups being such that the ratio of cationic groups to anhydroalucose units in the particles is at least 1:100, said method comprising reacting said cellulose with a cationizing agent selected from the group consisting of aluminum salts, cationic polyelectrolytes, reactive monomers, and combinations thereof, wherein the reactive monomers are primary, secondary, or tertiary amines or quatemary ammonium bases.
A method for promoting the incorporation of interfering substances in a paper product during manufacturing of the paper product, the method comprising:
- providing an aqueous slurry adapted for forming the paper product, said slurry including interfering substances;
- and
- adding an effective amount of cellulose particles to the aqueous slurry, the cellulose particles comprising cationic groups wherein the concentration of the cationic groups increases or is at least constant from the external surface of the particle to the interior of the particle, and the ratio of cationic groups to anhydroglucose units in the particle is at least 1:100;
- whereby the cellulose particles promote the incorporation of the interfering substances in the paper product.
A method for precipitating organic material in a waste water treatment process, the method comprising:
- providing waste water having organic material dispersed therein;
- and
- adding an effective amount of cellulose particles to the waste water, the cellulose particles comprising cationic groups wherein the concentration of the cationic groups increases or is at least constant from the external surface of the particle to the interior of the particle, and the ratio of cationic groups to anhydroglucose units in the particle is at least 1:100;
- whereby at least a portion of the organic material precipitates from the waste water.
A composition comprising:
- a water-soluble polymer;
- and
- cellulose particles comprising cationic groups, wherein the concentration of cationic groups increases or is at least constant from the external surface of the particles to the interior of the particles, and the concentration of cationic groups being such that the ratio of cationic groups to anhydroglucose units in the particles is at least 1:100.
Dependencies are inferred from the claim text.