Method for reducing thermal and light-induced brightness...

Details Method for reducing thermal and light-induced brightness... Method for reducing thermal and light-induced brightness...

D - Textiles, Paper

21

H

D21H 17/06 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2170051

A method and article of manufacture thereof is provided for reducing brightness reversion in bleached lignin-containing pulps or newsprint by the treatment of the bleached lignin-containing pulp or newsprint with 2,5-dihydroxydioxane. In one embodiment, calcium carbonate is added to enhance the activity of 2,5-dihydroxydioxane.

L'invention se rapporte à un procédé ainsi qu'à un article fabriqué selon celui-ci, ce procédé servant à réduire l'assombrissement des pulpes ou du papier journal contenant de la lignine et blanchis, par traitement de ces pulpes ou de ce papier journal avec du 2,5-dihydroxydioxane. Dans une réalisation, on ajoute du carbonate de calcium pour augmenter l'activité du 2,5-dihydroxydioxane.

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