Cellulase composition containing cellulase and papermaking polymers for paper dry strength application
AssigneeHercules Incorporated
InventorsQu-Ming Gu, Frank J. Sutman
Life of this patent
Estimating the term…
Abstract
Disclosed herein are cellulase compositions useful as papermaking performance additives for improving paper dry strength of a paper product and reducing refining energy in papermaking processes, and improving paper production. These cellulase compositions are formulated using cellulase, papermaking contaminant control polymers, protein stabilizers and cellulase enhancers. These cellulase compositions measure higher in endo-cellulase activity with better stability than conventional cellulase, and have shown differentiating performance in improving paper dry strength properties versus cellulase alone.
Claims20
A composition for treating cellulosic fibers used to make paper or paperboard comprising:
- a) cellulase;
- b) contaminant control polymer(s);
- wherein the contaminant control polymer(s) are selected from the group consisting of detackifier polymer(s), cationic fixative polymer(s), and mixtures thereof.
A method of making paper or paperboard comprising:
- providing a cellulase composition comprising:
- cellulase;
- and a contaminant control polymer(s);
- wherein the cellulase composition is added to a pulp slurry in an amount in cellulase activity ranging from about 5 ECU to about 2,500 ECU per kilogram dry wood fiber to produce a treated pulp slurry;
- refining the treated pulp slurry to a desired freeness;
- and
- forming a paper or paperboard.
Dependencies are inferred from the claim text.