Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Solid – shaped macroscopic article or structure
Patent
1998-11-03
1999-09-28
Kopec, Mark
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Solid, shaped macroscopic article or structure
C11D 304, C11D 333, C11D 336
Patent
active
059588667
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a spray-dried component comprising a chelant, in particular diethylene triamine penta(methylene phosphonic acid) or its salts. Such components are useful in granular detergent products, and also as intermediate products in the manufacture of bar soap, detergent tablets and other detergent forms such as extrudates, agglomerates and the like.
U.S. Pat. No. 4,259,200, issued on Mar. 31, 1981, discloses phosphonates complexed with calcium, magnesium, zinc or aluminium ions, the molar ratio of metal ion to phosphonate being at least 1:1. It is disclosed that the magnesium and the phosphonate can be premixed in any suitable solvent, including water, optionally mixed with other detergent components and spray-dried. Improved storage stability in bleaching compositions is sought.
EP-A-0 225 309, published on Jun. 10th, 1987, discloses the addition of salts of alkali or alkaline earth metals into particles comprising diethylene triamine penta(methylene phosphonic acid) for the purpose of improving free-flow and storage properties. The amount of sulphate is 60% to 200% of the dry weight of the chelant, corresponding to a weight ratio of metal ion salt to chelant of from 0.6:1 to 2:1. Preferred water content after spray-drying is less than 10% by weight of the particle.
The prior art does not suggest that spray-dried components may be prepared having a high chelant content (at least 50% by weight) and which still maintain good free-flowing properties.
The object of the present invention is to provide a spray-dried component which is in the form of a free-flowing particle with high chelant activity.
SUMMARY OF THE INVENTION
This object is achieved by a spray-dried component comprising: or alkaline earth metal sulphate; and
The chelant is preferably a phosphonic or succinic acid, or salt of phosphonic or succinic acid, more preferably the chelant is selected form the group consisting of diethylene triamine penta(methylene phosphonic acid), ethylene diamine-N,N'-disuccinic acid, or mixtures, or salts thereof.
The alkaline earth metal is preferably magnesium.
DETAILED DESCRIPTION OF THE INVENTION
The spray-dried component of the present invention comprises a chelant. Chelants are used, for example in detergent compositions, for their ability to complex with metal irons such as iron and/or manganese forming soluble chelates. Suitable chelants can be selected from the group consisting of amino carboxylates, amino phosphonates, polyfunctionally-substituted aromatic chelants and mixtures thereof.
Useful amino carboxylates include ethylenediaminetetracetates ("EDTA"), N-hydroxyethylethylene diaminetriacetates, nitrilotriacetates, ethylene diamine tetraproprionates, triethylene tetraaminehexacetates, diethylenetriaminepentaacetates, and ethanoldiglycines, alkali metal, ammonium, and substituted ammonium salts thereof, and mixtures thereof.
Useful amino phosphonates include ethylenediaminetetrakis (methylenephosphonates), sold as DEQUEST.RTM.. Preferably these amino phosphonates do not contain alkyl or alkenyl groups with more than about 6 carbon atoms.
Particularly preferred chelants are diethylene triamine penta(methylene phosphonic acid) ("DTPMP") and ethylene diamine tetra(methylene phosphonic acid) (EDTMP).
Polyfunctionally-substituted aromatic chelants are also useful in the components herein. See U.S. Pat. No. 3,812,044, issued May 21, 1974, to Connor et al. Preferred compounds of this type in acid form are dihydroxydisulfobenzenes such as 1,2-dihydroxy-3,5-disulfobenzene.
A preferred biodegradable chelant for use herein is ethylene described in U.S. Pat. No. 4,704,233, issued on Nov. 3, 1987, to Hartman and Perkins.
Magnesium, aluminium or zinc sulphates are preferred for use in the present invention, magnesium sulphate being the most preferred. Epsom salts; MgSO4.7H2O, i.e. the hydrated, crystalline form of magnesium sulphate with seven moles of water is particularly preferred.
The chelants used in the present invention may be conveniently provided from commercially available sourc
REFERENCES:
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patent: 4259200 (1981-03-01), Sims et al.
patent: 4666623 (1987-05-01), May et al.
patent: 4764303 (1988-08-01), Vandenbulcke et al.
patent: 5104568 (1992-04-01), Shaw, Jr. et al.
patent: 5292446 (1994-03-01), Painter et al.
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Donoghue Scott John
Doumen Achille Jules Edmond
Bolam B. M.
Hardee John R.
Khosla P. J.
Kopec Mark
Rasser J. C.
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