| 摘要 |
A bleach particle comprising: i) at least above about 50% by weight thereof of diacyl and/or tetraacyl peroxide bleaching species selected from diacyl peroxides of the general formula: <?in-line-formulae description="In-line Formulae" end="lead"?>R<SUP>1</SUP>-C(O)-OO-(O)C-R<SUP>2 </SUP><?in-line-formulae description="In-line Formulae" end="tail"?> in which R<SUP>1 </SUP>represents a C<SUB>6</SUB>-C<SUB>18 </SUB>alkyl group and R<SUP>2 </SUP>represents an aliphatic group compatible with a peroxide moiety, such that R<SUP>1 </SUP>and R<SUP>2 </SUP>together contain a total of 8 to 30 carbon atoms; the tetraacyl peroxide bleaching species is selected from tetraacyl peroxides of the general formula: <?in-line-formulae description="In-line Formulae" end="lead"?>R<SUP>3</SUP>-C(O)-OO-C(O)-(CH<SUB>2</SUB>)n-C(O)-OO-C(O)-R<SUP>3 </SUP><?in-line-formulae description="In-line Formulae" end="tail"?> in which R<SUP>3 </SUP>represents a C<SUB>1</SUB>-C<SUB>9 </SUB>alkyl group and n represents an integer from 2 to 12; and ii) from about 0.1% to about 10% by weight thereof of a radical scavenger.
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