Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-01-24
1998-01-06
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510309, 510315, 510349, 510375, 510376, 510377, 510438, 510441, 510511, 2521862, 25218627, C11D 3395, C11D 718
Patent
active
057054665
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to detergent compositions comprising percarbonate bleach. In particular it relates to compositions which have a high bulk density, improved characteristics of dispensing from either the drawer of a washing machine, or other dispensing device, thereby giving improved cleaning performance of bleaching compositions.
Inorganic perhydrate bleaches, such as perborate, percarbonate, and persilicate are well-known as detergent components. Preferably they are combined with peracid precursors which perhydrolise the perhydrate to form the active peracid. This perhydrolysis reaction is promoted by alkaline conditions.
Compositions which comprise percarbonate and peroxy carboxylic acid bleach precursors have been described in detail in the Applicants co-pending application WO9206163, published on 16th Apr., 1992.
Compositions which aim to improve dispensing characteristics of high bulk density detergents have also been described in the prior art.
EP 534525, published on 31st Mar., 1993 describes the use of particulate citric acid having a specified particle size in order to aid dispensing. Bleach compounds including percarbonate are mentioned.
However, use of particulate citric acid does not address the problem of providing alkaline conditions in the wash liquor.
The use of water-soluble alkaline inorganic salts in the composition would address this problem.
EP 229671, published on 22nd Jul., 1987 proposes the use of particulate carbonate or phosphonates in specified detergent compositions. It is claimed that improved dispersibility and solubility in cold water can be achieved.
The use of sodium silicate as a suitable particulate water-soluble alkaline inorganic salt is known to contribute to the inhibition of corrosion of washing machine drums, and to the rapid removal of heavy metal colloids from the laundry soil which would otherwise tend to destabilise the peroxygen and peracid species.
Although silicate is sparingly soluble in cold water, and therefore dry mixed, fine particles of silicate (with a particle size diameter of less than 425 micrometers) with high surface area are preferred, it has been observed that the combination of perborate monohydrate and fine soluble particles of inorganic salts, including silicate) is detrimental to the dispensing profile of the product. Attempts to replace the fine particles of silicate by coarser silicate, or to replace perborate monohydrate by perborate tetrahydrate has been found to lead to poorer cleaning performance.
It has now been found that the replacement of perborate monohydrate with some specific percarbonate materials permits the incorporation of a high level of fine, rapidly-soluble silicate particles without causing any dispensing issue, and gives excellent cleaning performance.
Consequently the detergent compositions of the present invention have both superior dispensing and superior bleaching performance.
SUMMARY OF THE INVENTION
A granular detergent composition having a bulk density of at least 650 g/l and comprising at least 5% by weight of anionic surfactants, nonionic surfactants, or mixtures thereof, and further comprising: form; 425 micrometers comprise at least 0.7% by weight of the composition.
DETAILED DESCRIPTION OF THE INVENTION
A granular detergent composition having a bulk density of at least 650 g/l and comprising at least 5% by weight of anionic surfactants, nonionic surfactants, or mixtures thereof, and further comprising: form; 425 micrometers comprise at least 0.7% by weight of the composition.
A particularly useful component of the present invention is at least 0.5% by weight of a peracid precursor chosen from tetraacetyl methylene diamine, tetraacetyl ethylene diamine, tetraacetyl hexylene diamine, perbenzoic acid or hydrophobic peracid precursors such as 2-phenyl 4h-3 1-benzoxazin-4-one, NOBS, iso-NOBS, benzoylcaprolactam, benzoyloxybenzenesulphonate or mixtures thereof.
Amorphous silicate which is rapidly water-soluble such as sodium silicate which has a ratio of SiO2:Na2O of less than 2.4 is preferred a
REFERENCES:
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Baillely Gerard Marcel
Cook Thomas Edward
Dusheck Caroline L.
Lieberman Paul
Patel K. K.
Rasser R. C.
The Procter & Gamble & Company
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