Compositions – Oxidative bleachant – oxidant containing – or generative – Composition containing a stabilizer or a product in the form...
Patent
1997-03-18
2000-06-06
Anthony, Joseph D.
Compositions
Oxidative bleachant, oxidant containing, or generative
Composition containing a stabilizer or a product in the form...
25218626, 25218627, 25218631, 510309, 510310, 510315, C01B 1500, C01B 1504, C01B 15055, C11D 339
Patent
active
06071431&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to particles comprising a peroxy compound and an amino acid. The invention also relates to use of the particles and a composition containing such particles.
Powder detergent compositions often contain peroxy compounds as bleaching agents which release hydrogen peroxide or peroxy acids in aqueous solutions. However, many peroxy compounds are not storage stable. Their decomposition is supposed to be catalysed by metal cations moving comparatively freely through the water normally being present in detergents, but is also facilitated by the alkaline pH (normally from about 8 to about 12) and by other components commonly present in detergents, for example zeolites or bleaching activators such as TAED (tetraacetylethylene diamine), TAGU (tetraacetylglucoluril) or PAG (penta acetyl glucose).
In order to make environmental friendly detergents it is desirable to use alkali metal carbonate peroxy hydraite, commonly known as percarbonate, as a bleaching agent. However, the activity of percarbonate in a detergent decreases rapidly through decomposition if the detergent is stored at normal room temperature and humidity.
Many attempts to stabilize percarbonate have been done, for example by mixing or coating with stabilizing substances such as sulfates, carbonates, borates, silicates or organic substances. Such stabilizing methods are described in the patent literature, for example in GB 1466799, GB 1538893, GB 1575792, EP 459625, US 3975280 and EP 573731.
U.S. Pat. No. 5,362,412 discloses incorporating certain biodegradable amino compounds into detergent compositions in order to improve the bleaching. However, improvement of the storage stability of peroxy compounds is not dealt with.
WPI abstract 85-053698/09, abstract of JP-A-60011210, describes incorporation of aminoacids having less than two carboxyl groups and a polyphosphonic acid into percarbonalte.
The object of the present invention is to provide particles comprising a peroxy compound, particularly alkali metal percarbonate, with improved storage stability, particularly in detergent compositions. It is another object of the invention to provide particles comprising a peroxy compound only containing environmental friendly constituents.
Through the present invention, these objects has been fulfilled by providing particles comprising a peroxy compound with capability of releasing hydrogen peroxide or peroxy acids in aqueous solutions, the particles further comprising an amino acid of the formula: a salt thereof.
Preferably n is 1 or 2 and most preferably m is n or 2n. In one preferred embodiment R is H, n is 2 and m is preferably 4. In another preferred embodiment R is CH.sub.2 OH or CH.sub.3, n is 1 and m is 1. Particularly preferred amino acids are selected from .beta.-alanine-N,N-diacetic acid, methylglycine N,N-diacetic acid, isoserine N,N-diacetic acid, or mixtures thereof.
The particles suitably comprises up to about 15% by weight, preferably up to about 10% by weight, most preferably up to about 5% by weight of amino acid(s) as described above or a salt thereof. The particles preferably comprise more than about 0.0% by weight, most preferably more than about 0.05% by weight of amino acid(s) as described above or a salt thereof. The amino acid may be mixed with the peroxy compound and/or be included in a coating.
It is assumed that the amino acid acts as a chelating agent, but it has surprisingly been found that the amino acids according to the invention gives better storage stability compared to conventional non-biodegradable chelating agents such a EDTA. Too high a concentration of amino acids or salts thereof may however decrease the thermal stability, particularly at high concentrations of the peroxy compounds.
It is preferred to use an alkali metal or an alkaline earth metal salt of the amino acid. Alkali metals are preferably selected from sodium, potassium or mixtures thereof, and alkaline earth metals are preferably selected from calcium, magnesium or mixtures thereof. Sodium salts are particularly preferred. In the fol
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Jigstam Monica
Lagnemo Hans
Anthony Joseph D.
Eka Chemicals AB
Serbin David J.
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