Metal ligand containing bleaching compositions

C - Chemistry – Metallurgy – 11 – D

Patent

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Details

C11D 3/39 (2006.01) C07D 257/10 (2006.01) C11D 3/395 (2006.01) D21C 9/10 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2261229

The invention provides a novel composition for bleaching cellulose based materials, such as wood pulp and paper which includes using an effective amount of a source of an oxidant and an oxidatively stable bleach activator having structure (I) wherein Y1, Y3 and Y4 each represents a bridging group having zero, one, two or three carbon containing nodes for substitution, and Y2 is a bridging group having at least one carbon containing node for substitution. Each node contains a C(R), C(R1)(R2), or a C(R)2 unit. Each R may be H, alkyl, cycloalkyl, cylcoalkenyl, alkenyl, aryl, alkynyl, alkylaryl, halogen, alkoxy, or phenoxy, CH2CF3, CF3 and combinations thereof, or form a substituted or unsubstituted benzene ring, or together with a paired R substituent bound to the same carbon atom form a cycloalkyl or cycloalkenyl ring; M is a transition metal; Q is any counterion; and L is any labile ligand.

Cette invention a trait à une composition de blanchiment de matériaux à base de cellulose, notamment de la pâte de bois et du papier. Cette composition, qui renferme une quantité efficace d'une source d'un agent oxydant et un activateur de blanchiment stable à l'oxydation, répond à la structure (I). Dans cette structure, Y1, Y3 et Y4 représentent chacun un groupe de pontage ne possédant pas de noeud contenant du carbone pour substitution ou contenant deux ou trois noeuds. Y2 représente un groupe de pontage possédant au moins un noeud contenant du carbone pour substitution. Chaque noeud contient un motif C(R), C(R1)(R2), ou un motif C(R)2. Chaque R peut représenter un hydrogène, un alkyle, un cycloalkyle, un cycloalcényle, un alcényle, un alkynyle, un alkylaryle, un halogène, un alcoxy ou un phénoxy, CH2CF3, CF3 et leurs combinaisons, ou bien est susceptible de constituer un cycle benzénique substitué ou non. Chaque R peut aussi, avec un symbole-R concerné par une substitution, couplé, lié au même atome de carbone, former un cycle cycloalkyle ou cycloalcényle; M représente un métal de transition, Q représente un quelconque contre-ion et L, un quelconque ligand labile.

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