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Abstract

The invention provides a novel composition for bleaching cellulose based materials, such as wood pulp and paper comprising: (a) an oxidatively stable bleach activator having the structure ##STR1## wherein Y.sub.1, Y.sub.3 and Y.sub.4 each represents a bridging group, i.e., zero, one, two or three carbon containing nodes for substitution, while Y.sub.2 is a bridging group of at least one carbon containing node for substitution, each said node containing a C(R), C(R.sub.1) (R.sub.2), or a C(R).sub.2 unit and each R substituent is the same or different from the remaining R substituents and is selected from the group consisting of H, alkyl, cycloalkyl, cycloalkenyl, alkenyl, aryl, alkynyl, alkylaryl, halogen, alkoxy, phenoxy, CH.sub.2 CF.sub.3, CF.sub.3 and combinations thereof, or form a substituted or unsubstituted benzene ring of which two carbon atoms in the ring form notes in the Y unit, or together with a paired R substituent bound to the same carbon atom form a cycloalkyl or cycloalkenyl ring, which may include an atom other than carbon, e.g., cyclopentyl or cyclohexyl; M is a transition metal with oxidation states of I, II, III, IV, V, VI, VII or VIII or selected from Groups 3, 4, 5, 6, 7, 8, 9, 10, and 11 of the Periodic Table; Q is any counterion which would balance the charge of the compound on a stoichiometric basis; L is any labile ligand; and (b) an effective amount of a source of an oxidant.

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First Claim