Inhibition of pulp and paper yellowing using hydroxylamines...

Details Inhibition of pulp and paper yellowing using hydroxylamines... Inhibition of pulp and paper yellowing using hydroxylamines...

D - Textiles, Paper

21

C

D21C 9/00 (2006.01) D21H 17/07 (2006.01) D21H 21/14 (2006.01)

Patent

CA 2346211

Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a N,N-dialkylhydroxylamine, an ester, amide or thio substituted N,N-dialkylhydroxylamine or N,N- dibenzylhydroxylamine or an ammonium salt thereof. This performance is often further enhanced by the presence of one or more coadditives selected from the group consisting of the UV absorbers, the polymeric inhibitors, the nitrones, the fluorescent whitening agents and metal chelating agents. Combinations of hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective. N,N-Diethylhydroxylamine and N,N-dibenzylhydroxylamine and their acid salts are surprisingly effective for this purpose.

Les pulpes ou les papiers, notamment les pulpes ou papiers chimio-mécaniques ou thermo-mécaniques, contenant encore de la lignine, ont une résistance renforcée au jaunissement lorsqu'ils contiennent une quantité efficace du point de vue de la stabilisation d'une N,N-dialkyl-hydroxylamine, d'une N,N-dialkyl-hydroxylamine substituée par un ester, un amide ou un thio ou encore d'une N,N-dibenzyl-hydroxylamine ou d'un sel d'ammonium de celle-ci. Ce résultat ainsi obtenu peut encore être souvent amélioré si l'on ajoute un ou plusieurs co-additifs sélectionnés dans le groupe constitué par des agents absorbants les ultraviolets, les inhibiteurs polymères, les nitrones, les agents blanchissants fluorescents et des agents de chélation du métal. L'association d'hydroxylamaines ou de leurs sels, de benzotriazole ou de benzophénone absorbant les ultraviolets et d'un agent de chélation de métal est particulièrement efficace. La N,N-diethyl-hydroxylamine, la N,N-dibenzyl-hydroxylamine et leurs sels acides sont étonnamment efficaces pour ce faire.

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