FORFARANDE FOR FRAMSTELLNING AV PAPPER MED HOG TORRHALLFASTHET

In order to increase the dry strength of paper without at the same time significantly increasing its wet strength, paper is surface-sized with an aqueous solution of an alkali metal salt and/or an alkaline earth metal salt of a copolymer of a) from 90 to 30% by weight of acrylic acid and/or methacry...

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Bibliographische Detailangaben
Hauptverfasser:	W GUENDER, S PFOHL, J STEDEFEDER
Format:	Patent
Sprache:	swe
Schlagworte:	IMPREGNATING OR COATING OF PAPER PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	In order to increase the dry strength of paper without at the same time significantly increasing its wet strength, paper is surface-sized with an aqueous solution of an alkali metal salt and/or an alkaline earth metal salt of a copolymer of a) from 90 to 30% by weight of acrylic acid and/or methacrylic acid, and b) from 10 to 70% by weight of acrylonitrile, methacrylonitrile, acrylamide and/or methacrylamide, with or without c) up to 30% by weight of an ester of acrylic acid and/or an ester of methacrylic acid, the copolymer having a viscosity of from 5 to 100 mPas in 2% by weight strength aqueous solution at 20 DEG C, measured in a Brookfield viscometer at 20 revolutions per minute.