| 摘要 |
The invention relates to a bleaching composition.In particular the invention provides a bleaching composition which comprises:(i) a bleaching agent, and(ii) as bleach catalyst, a polyoxometalate of Keggin, Dawson or Finke structure and having the general formula (II) whereinthe or each A', which may be the same or different, is a cation;a' has a value such that (A')a, counters the anionic charge of (Cox'Yy'Mm'Oo);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, representsW, Mo, V, Nb or Ta;m' has a value of between 9 and 18;c has a value of between 0 and 84.The bleaching compositions according to the invention have good bleaching performance and can be used without a bleach activator, e.g. at low temperatures. |
