The inhibition of photo-yellowing in paper

Details The inhibition of photo-yellowing in paper The inhibition of photo-yellowing in paper

D - Textiles, Paper

21

H

D21H 17/68 (2006.01) D21H 17/06 (2006.01) D21H 21/14 (2006.01) D21H 23/28 (2006.01)

Patent

CA 2226802

The present invention relates to a method for the inhibition of photo-yellowing in paper rich in lignin by treatment of pulp or paper rich in lignin with a compound containing hydroxy functionalities that are capable of forming a ketal with a carbonyl group in an acidic environment. In a preferred embodiment the acidic environment is provided by the presence of an acidic clay or an acidic zeolite.

Méthode d'inhibition du photo-jaunissement du papier riche en lignine par un traitement de la pâte ou du papier avec un composé contenant des fonctionnalités d'hydroxy pouvant former un cétal avec un groupe carbonyle dans un environnement acide. De préférence, l'environnement acide résulte de la présence d'argile ou de zéolite.

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