D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 21/16 (2006.01) D21H 17/17 (2006.01)
Patent
CA 2201337
The present invention relates to a method of improving the water repellency of paper in papermaking by virtue of adding prior to web formation to the pulp slurry such a sizing dispersion that contains at least a ketene dimer compound as a hydrophobic sizing agent, and further contains water-soluble colloidal polymer in an amount which is at least 100 % by weight of the hydrophobic sizing agent. The invention is particularly applicable for improving the water repellency of paper containing calcium carbonate as the filler.
La présente invention se rapporte à un procédé visant à améliorer l'hydrophobicité du papier dans la fabrication du papier, ce procédé consistant à ajouter à la suspension de pâte de cellulose, avant la formation de bande, une dispersion de collage contenant au moins un composé dimère de cétène faisant office d'agent de collage hydrophobe, ainsi qu'un polymère colloïdal soluble dans l'eau en une quantité représentant au moins 100 % en poids de l'agent de collage hydrophobe. L'invention est notamment destinée à améliorer l'hydrophobicité du papier contenant du carbonate de calcium comme charge de remplissage.
Malmstrom Olof
Nurminen Markku
Zetter Claes
Ciba Specialty Chemicals Holding Inc.
Mccarthy Tetrault Llp
Raisio Chemicals Oy
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