CATIONIC AND ANIONIC POLYELECTROLYTES FOR ENHANCING THE FREENESS OF PAPER PULP

A process for improving the freeness of paper pulp comprise (a) contacting the pulp with 0.05 wt.% of a cellulolytic enzyme at a temp. of at least 40[deg]C for 0.5-1 hr.; (b) adding at least 0.011 wt.% of a water-soluble cationic polymer; (c) adding at least 0.007 wt.% of a water soluble acrylamide/...

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Bibliographische Detailangaben
Hauptverfasser:	SARKAR, JAWED M, COSPER, DAVID R
Format:	Patent
Sprache:	eng ; fre ; ger
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 comprise (a) contacting the pulp with 0.05 wt.% of a cellulolytic enzyme at a temp. of at least 40[deg]C for 0.5-1 hr.; (b) adding at least 0.011 wt.% of a water-soluble cationic polymer; (c) adding at least 0.007 wt.% of a water soluble acrylamide/acrylic acid anionic polymer; and (d) forming the treated pulp into paper. Pref. the water soluble cationic polymer is a copolymer of 20-80 wt.% acrylamide and diallyldimethyl ammonium chloride. The anionic polymer comprises 20-95 wt.% acrylamide and 5-80 wt.% anionic monomer partic. acrylic acid and methylacrylic acid.