Enhanced efficacy of fungicides in paper and paperboard

Details Enhanced efficacy of fungicides in paper and paperboard Enhanced efficacy of fungicides in paper and paperboard

D - Textiles, Paper

21

H

D21H 21/36 (2006.01) D21H 17/29 (2006.01) D21H 17/37 (2006.01) D21H 17/44 (2006.01) D21H 17/56 (2006.01) D21H 23/04 (2006.01)

Patent

CA 2594189

The invention is a method for making a fungal-resistant sheet of paper or paperboard for use in building materials. The method comprises adding a hydrophobic fungicide with a solubility in water of less that 0.3 g/L at 25~ C to a paper slurry during manufacture of the paper or paperboard, and processing the paper slurry in a paper machine to create a sheet. Addition of a second process additive, especially a cationic fixative, synergistically improves the efficacy of the hydrophobic fungicide. A preferred fungicide is diiodomethyl-p-tolylsulfone.

L'invention concerne un procédé de fabrication d'une feuille de papier ou de carton résistant aux champignons qui s'utilise dans des matériaux de construction. Le procédé comporte les étapes consistant à: ajouter à une suspension de pâte à papier, au cours de la fabrication du papier ou du carton, un fongicide hydrophobe présentant une solubilité dans l'eau inférieure à 0,3 g/L à 25° C, et traiter la suspension dans une machine à papier afin de produire une feuille. L'ajout d'un deuxième additif de procédé, notamment un fixatif cationique, permet d'améliorer de façon synergique l'efficacité du fongicide hydrophobe. Le fongicide préféré est le diiodométhyl-p-tolylsulfone.

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