CATIONIC AND ANIONIC POLYELECTROLYTES FOR ENHANCING THE FREENESS OF PAPER PULP

A process for improving the freeness of paper pulp, which comprises the ste ps of adding to the pulp at least 0.05%, based on the dry weight of the pulp, o f a cellulolytic enzyme, allowing the pulp to contact the cellulolytic enzyme fo r from about 40 minutes to about 60 minutes at a temperature of...

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Bibliographische Detailangaben
Hauptverfasser:	SARKAR, JAWED M, COSPER, DAVID R
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPARATUS THEREFOR BEER BIOCHEMISTRY CHEMISTRY ENZYMOLOGY IMPREGNATING OR COATING OF PAPER METALLURGY MICROBIOLOGY MUTATION OR GENETIC ENGINEERING PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS PULP COMPOSITIONS REGENERATION OF PULPING LIQUORS SPIRITS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G VINEGAR WINE
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Beschreibung
Zusammenfassung:	A process for improving the freeness of paper pulp, which comprises the ste ps of adding to the pulp at least 0.05%, based on the dry weight of the pulp, o f a cellulolytic enzyme, allowing the pulp to contact the cellulolytic enzyme fo r from about 40 minutes to about 60 minutes at a temperature of at least 40.degree. C, adding at least 0.011%, based on the dry weight of the pulp, of a water soluble cation ic polymer, adding at least 0.007%, based on the dry weight of the pulp, of a water soluble anionic or nonionic polymer and forming the thus treated pulp into paper.