Activation of Peroxygen Bleach
AssigneeWarwick International Group Limited
InventorsMatthew Brian Skett, Gary Miller
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Abstract
A peracid bleaching species is formed in situ in aqueous wash liquor by reaction of a peroxygen bleach precursor, such as perborate or percarbonate, and a bleach activator. The bleach activator is an acetylated ethylene diamine, that comprises at east 25% triacetyl ethylene diamine. The peracid is formed more rapidly even at low temperatures (F2) compared to use of conventional pure tetracetyl ethylene diamine (F1) and better disinfectant properties result.
Claims29
A process for producing a peracetic acid solution comprising reacting in aqueous solution hydrogen peroxide or a precursor thereof and an N-acetylated ethylene diamine material to perhydrolyse the amide bond, characterized in that the N-acetylated ethylene diamine material comprises at least 50% by weight N,N,N′-triacetylethylene diamine (TriAED), at least 5% by weight N,N,N′,N′-tetraacetylethylene diamine (TAED) and N,N′-diacetylethylene diamine (DAED), in an amount in the range less than 20% by weight.
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A particulate detergent composition comprising a peroxygen bleach precursor particles and N-acetylated ethylene diamine material particles, characterized in that the said N-acetylated ethylene diamine material particles comprises at least 50% by weight TriAED, at least 5% TAED and DAED in an amount less than 20% by weight.
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Dependencies are inferred from the claim text.