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US 6,444,091 B1Granted
Structurally rigid nonionic and anionic polymers as retention and drainage aids in papermaking
AssigneeNalco Chemical Company
InventorsWilliam J. Ward, Andrew J. Dunham, Phillip W. Carter, Andrei S. Zelenev
Life of this patent
Estimating the term…
Abstract
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.
Claims9
A method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a structurally rigid anionic condensation polymer of one or more aryldiamines and one or more cyclic dicarboxylates where at least one of the aryldiamines and cyclic dicarboxylates contains an anionic substitutent.
A paper product prepared by
- i) adding to a papermaking furnish an effective amount of a structurally rigid anionic condensation polymer of one or more aryldiamines and one or more cyclic dicarboxylates where at least one of the aryldiamines and cyclic dicarboxylates contains an anionic substitutent;
- and
- ii) draining the furnish to form a sheet.
Dependencies are inferred from the claim text.