C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 211/94 (2006.01) C07D 405/12 (2006.01) C08K 5/3435 (2006.01) D21C 9/00 (2006.01) D21H 21/14 (2006.01)
Patent
CA 2295631
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 hindered amine compound which preferably is a nitroxide, a hydroxylamine 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, metal chelating agents, sulfur containing stabilizers, metal salts and diene compounds. Combinations of nitroxides, hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective. Selected derivatives of 1-oxyl-2,2,6,6- tetramethylpiperidin-4-ol and selected hydroxylamine salts are novel compounds and are surprisingly effective for this purpose.
L'invention concerne des pâtes ou des papiers, en particulier chimico-mécaniques ou thermo-mécaniques, qui contiennent encore de la lignine. On augmente leur résistance au jaunissement en y introduisant une quantité stabilisante efficace de composé amine encombré qui est de préférence un oxyde nitré, une hydroxylamine ou un sel d'ammonium qui en est dérivé. On améliore encore ladite résistance par la présence d'un ou plusieurs co-additifs choisis dans le groupe suivant : absorbeurs UV, inhibiteurs polymériques, nitrones, aviveurs fluorescents, agents chélaterurs de métal, stabilisants à base de soufre, sels métalliques et composés diéniques. Les combinaisons d'oxydes nitrés, d'hydroxylamines ou de leurs sels, d'absorbeurs UV à base de benzotriazole ou de benzophénone et d'un agent chélateur de métal sont particulièrement efficaces. Un certain nombre de dérivés de 1-oxyl-2,2,6,6-tétraméthylpipéridine-4-ol et de sels d'hydroxylamine sont des composés nouveaux étonnamment efficaces aux fins de la présente invention.
Cunkle Glen Thomas
Heitner Cyril
Mcgarry Peter Francis
Nelson Randall Bruce
Schmidt John Alois
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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