Chlorohydrin and cationic compounds having high affinity for...

D - Textiles – Paper – 21 – H

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D21H 21/14 (2006.01) C07D 205/00 (2006.01) C07D 211/00 (2006.01) C07D 211/94 (2006.01) C07D 221/00 (2006.01) C07D 235/00 (2006.01) C07D 401/04 (2006.01) C07D 401/12 (2006.01) C07D 401/14 (2006.01) C07D 471/10 (2006.01) C08K 5/3435 (2006.01) D21C 9/00 (2006.01)

Patent

CA 2382448

Selected chlorohydrin and cationic compounds containing nitroxide or hydroxylamine moieties are effective in stabilizing pulp or paper, especially pulp or paper containing lignin, against yellowing and discoloration due to the adverse effects of light. These compounds are added at various points in the paper-making process, especially at the wet ends, making the need for water soluble or water dispersible materials having high affinity for pulp or paper essential. 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.

L'invention concerne la chlorohydrine et des composés cationiques sélectionnés renfermant des fractions nitroxyde ou hydroxylamine, qui sont efficaces pour stabiliser la pâte ou le papier, notamment la pulpe ou le papier contenant de la lignine, contre le jaunissement et la décoloration causées par les effets néfastes de la lumière. Ces composés sont ajoutés à certains moments au cours du procédé de fabrication du papier, spécialement aux extrémités d'imprégnation, rendant essentielles des matières hydrosolubles ou dispersables dans l'eau présentant une excellente affinité pour la pâte ou le papier. Cette qualité est souvent améliorée davantage par la présence d'un ou de plusieurs co-additifs sélectionnés dans le groupe constitué par les absorbeurs d'UV, les inhibiteurs polymères, les nitrones, les agents blanchissants fluorescents et les agents de chélation du métal. Des combinaisons d'hydroxylamines et de leurs sels, des absorbeurs d'UV benzotriazoles ou benzophénones et un agent de chélation du métal sont particulièrement efficaces.

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