Patent ID: 6326342
Filing Date: 2001-12-04
Classification: C11D

Abstract:
A bleaching composition comprising(i) a bleaching agent, and(ii) as bleach catalyst, a polyoxometalate of Keggin, Dawson or Finke structure and having the general formula (II)(A').sub.a' (Co.sub.x' Y.sub.y' M.sub.m' O.sub.o).cH.sub.2 O (II)whereinthe or each A', which may be the same or different, is a cation;a' has a value such that (A').sub.a' counters the anionic charge of (Co.sub.x' Y.sub.y' M.sub.m' O.sub.o);x' has a value of 0.25 to 4;the or each Y, which may be the same or different, representsP, Si or Co;y' is 1 or 2;o has a value of 34 to 68;the or each M, which may be the same or different, represents W, Mo, V, Nb or Ta;m' has a value of 9 to 18; andc has a value of between 0 and 84.