Nalco Chemical Company

Ondeo Nalco Company

Andrei S Zelenev

Phillip W Carter

William J Ward

Jane B Wong Shing

Ross Gray

Andrew J Dunham

Jiwei Chen

A method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a diallyl-N,N-disubstituted ammonium halide/acrylamide copolymer and an effective amount of a cationic structurally-modified water-soluble polymer, the cationic structurally-modified water-soluble polymer prepared by initiating polymerization of an aqueous solution of from about 95 to about 5 mole percent of an acrylamide monomer and from about 5 to about 95 mole percent of a cationic monomer under free radical polymerization conditions to form a polymer solution and adding at least one structural modifier to the polymer solution after at least 30% polymerization of the monomers has occurred.

Method of improving retention and drainage in a papermaking process using a diallyl-N,N-disubstituted ammonium halide-acrylamide copolymer and a structurally modified cationic polymer

This invention concerns a method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a structurally rigid nonionic or anionic polymer.

Structurally rigid nonionic and anionic polymers as retention and drainage aids in papermaking

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Oak Park, IL, United States of America

Andrei S Zelenev