Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Patent
1997-04-25
1999-06-22
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
510375, 510376, 2521861, C11D 718, C11D 754, C11D 942, C11D 300
Patent
active
059143045
DESCRIPTION:
BRIEF SUMMARY
This invention relates to liquid oxidising compositions which contain peroxide. The invention particularly relates to concentrates of bleaching compositions which contain peroxide and which can be diluted by the user to obtain a washing composition.
Aqueous peroxide-containing compositions are known, but may lack stability. It is desirable to produce alkaline peroxide-containing aqueous liquids because the activity of the peroxide is enhanced as compared to acidic liquors and alkaline solutions are preferred for some applications.
However, it is well known that aqueous alkaline conditions present particular difficulties for liquid compositions containing peroxide because the peroxide tends to decompose rapidly under such conditions. Therefore, there are considerable difficulties in trying to produce an alkaline peroxide-containing composition which is sufficiently storage stable. One way of overcoming this problem is to prepare an alkaline peroxide-containing composition and use it immediately, for example as described in GB-A-2030609, so that storage stability is not required. This reference relates to protection of metal complex-based dyes or pigments when fibrous articles are bleached. The bleaching compositions therefore include chelating agents: dimethyl glyoxime and an amino carboxylic acid. The present inventors have found that aminocarboxylic acids such as EDTA are not effective in stabilising liquid peroxide compositions.
There have however been several attempts to prepare stabilised liquid compositions which are alkaline and which contain peroxide. For example in U.S. Pat. No. 3,951,840, U.S. Pat. No. 5,180,514, GB-A-2,072,643, EP-A-0,076,166 and EP-A-0,037,184 several different methods are disclosed, all of which require the use of an alcohol as a stabilising agent.
In U.S. Pat. No. 3,951,840, a solid peroxide bleaching composition is prepared incorporating, for stability, a chelating agent capable of forming a water-soluble or poorly water-soluble compound. The chelating agent is either added to the final composition or it is present during the reaction of sodium carbonate, sodium pyrophosphate or sodium borate with hydrogen peroxide to form the inorganic bleaching agent. It is reported that the presence of the sequestering agent during that reaction produced more stable peroxide adduct components.
In U.S. Pat. No. 5,180,514, aqueous peroxide bleaching compositions are described. It is described that trace metal cations in amounts of 0.5 ppm or greater result in deterioration of peroxide compositions. Stabilisation is achieved in this reference by incorporating a heavy metal sequestering agent or chelating agent and an aromatic amine free radical scavenging agent. The pH of the bleach compositions is said to be in the range 1 to 8, more preferably 1 to 6 and most preferably 2 to 4. In the examples, the stabilised bleach formulations prepared are all acidic.
In GB-A-2,072,643, stability is obtained using a combination of non-aqueous solvent (ethanol), amino compounds substituted by acetate or methylene phosphonates and hydroxy alkyl diphosphonates, particularly with a polyhydroxy carboxylate, preferably gluconate or an amino acetate. The particular difficulty of preventing the hydrogen peroxide from decomposing on storage in an alkaline composition is discussed. It is specifically stated that deionised water is used to minimise peroxide decomposition.
In EP-A-0,076,166, stabilisation is achieved using a combination of isopropanol and an aminomethylene phosphonate or hydroxyalkyl diphosphonate, optionally with a polyhydroxy aliphatic carboxylate.
In WO91/09807, stabilisation is achieved by introducing amino poly(alkylene phosphonic acid) or a salt thereof, into a concentrated aqueous acidic solution of hydrogen peroxide, storing the mixture until the aminopoly(alkylene phosphonic acid) or salt has been converted to a derivative in the acidic solution and then diluting the concentrate with alkali to form a mildly alkaline solution.
In WO93/13012, an aqueous alkaline hydrogen peroxide composition i
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Croud Vincent Brian
Scarborough Susan Jane
Tompsett Stephen James
Lieberman Paul
Petruncio John M.
Warwick International Group, Ltd.
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