Composition and method for improving retention and drainage in papermaking processes by activating microparticles with a promoter-flocculant system
AssigneeNalco Company
InventorsJane B. Wong Shing, Javier S. Cardoso
Life of this patent
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Abstract
A composition and method for improving retention and drainage in a papermaking process is disclosed. An unexpected synergistic effect has been observed when certain amounts of a promoter are used in conjunction with a microparticle. Optionally, a flocculent is also used to further improve the observed synergism. The microparticle includes an inorganic anionic or cationic siliceous material. The promoter includes a modified diallyl-N,N-disubstituted ammonium halide polymer. The flocculant includes one or more high molecular weight, water-soluble cationic, anionic, nonionic, zwitterionic, or amphoteric polymers.
Claims20
A method of improving retention and drainage in a papermaking process, the method comprising adding to a papermaking furnish, in any order:
- (a) an effective amount of a microparticle;
- (b) an effective amount of a promoter, wherein the promoter includes a modified diallyl-N,N-disubstituted ammonium halide polymer;
- and
- (c) optionally, an effective amount of a flocculent, wherein the flocculent includes one or more high molecular weight, water-soluble cationic, anionic, nonionic, zwitterionic, or amphoteric polymers having an RSV of at least about 3 dL/g.
A method of activating a siliceous microparticle added to a papermaking furnish, the microparticle having a surface area of about 700 m2/g to about 1100 m2/g and an S-value from about 20 to about 50, the method comprising:
- (a) adding an effective amount of a promoter to the papermaking furnish, wherein the promoter includes a modified diallyl-N,N-disubstituted ammonium halide polymer having a cationic charge of about 1 to about 99 mole percent;
- and
- (b) optionally adding a synergistically effective amount of a flocculant to the furnish, wherein the flocculent includes one or more high molecular weight, water-soluble cationic, anionic, nonionic, zwitterionic, or amphoteric polymers having an RSV of at least about 3 dL/g, and wherein the flocculent is selected from the group consisting of dimethylaminoethylacrylate methyl chloride quaternary salt-acrylamide copolymers and sodium acrylate-acrylamide copolymers and hydrolyzed polyacrylamide polymers.
A composition for improving retention and drainage in a papermaking furnish, the composition comprising:
- (a) a siliceous microparticle having a surface area of about 700 m2/g to about 1100 m2/g and an S-value from about 20 to about 50;
- (b) a promoter including a modified diallyl-N,N-disubstituted ammonium halide polymer having a cationic charge of about 1 to about 99 mole percent;
- and
- (c) optionally a flocculant including one or more high molecular weight, water-soluble cationic, anionic, nonionic, zwitterionic, or amphoteric polymers having an RSV of at least about 3 dL/g.
Dependencies are inferred from the claim text.