Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Clay or inorganic aluminosilicate salt component
Patent
1998-06-10
1999-09-28
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Clay or inorganic aluminosilicate salt component
510276, 510315, 510323, 510509, 510532, C11D 312, C11D 310
Patent
active
059588713
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a detergent composition comprising both zeolite as a sequestering agent for water hardness and bicarbonate builder.
Detergent compositions for fabric washing conventionally contain detergency builders which lower the concentration of calcium and magnesium water hardness ions in the wash liquor and thereby provide good detergency effect in both hard and soft water.
Conventionally, inorganic phosphates, such as sodium tripolyphosphate, have been used as builders for laundry detergents. More recently, alkali metal aluminosilicate ion-exchangers, particularly crystalline sodium aluminosilicate zeolite A, have been proposed as replacements for the inorganic phosphates.
For example, EP 21 491A (Procter & Gamble) discloses detergent compositions containing a building system which includes zeolite A, X or P (B) or a mixture thereof. EP 384070A (Unilever) discloses specific zeolite P materials having an especially low silicon to aluminium ratio not greater than 1.33 (hereinafter referred to as zeolite MAP) and describes its use as a detergency builder.
Zeolite builders are typically used in detergent compositions with cobuilders to provide optimum building capacity for the detergent composition as a whole. Carbonate is a particularly commonly used cobuilder, which is favoured in part, for its ability to provide both building capacity and alkalinity to a wash solution.
The Applicants have now surprisingly found that a problem may occur when a water insoluble zeolite having a small particle size, is used as a detergency builder in a fabric laundering detergent composition also containing relatively high levels of carbonate cobuilder. The problem has been found to be particularly pronounced when the zeolite builder is zeolite MAP.
The choice of a small particle size for a zeolite MAP component, that is to say particles having a particle size, measured as a d.sub.50 value, of up to 1.0 micrometers has previously been taught to be preferred in the art, as represented, for example, by EP 384070 A.
The problem relates to the aforementioned detergent compositions having a marked incompatibility with printed cotton fabrics. In particular, it has been found that the use of detergent compositions containing small particle size zeolite tends to lead to the removal of printed pigment from a printed cotton fabric surface. The presence of relatively high levels of carbonate cobuilder has been found to exarcebate this effect.
The Applicant has surprisingly found that this problem can be ameliorated by the partial or complete replacement of the carbonate component of the detergent composition by a bicarbonate builder component.
The present invention is thus based on the unexpected finding that the printed cotton fabric care profile of a detergent composition comprising zeolite of small particle size, bicarbonate builder and relatively low levels of carbonate builder is superior to that of comparably alkaline and built compositions containing principally carbonate cobuilder.
This finding allows the formulation of detergent compositions providing both excellent cleaning and printed fabric care properties on cotton fabrics.
Whilst the prior art, as represented for example by European Patent Aplications, EP 384070 A, EP 448297 A, EP 522726 A, EP 533392 A, EP 544492 A, EP 552053 A, and EP 552054 A has envisaged the use of cobuilders in combination with zeolite in laundry detergent compositions, none of these prior art documents specifically disclose the use of bicarbonate cobuilder with a small particle size zeolite component. Furthermore, none of these prior art documents provides any teaching relating to the printed cotton fabric care problem addressed by the current invention, nor of any solution thereto involving the selection of a particular bicarbonate cobuilder component.
Thus, the present invention provides a detergent composition containing micrometers; is less than 4:1.
In a preferred embodiment of the invention the zeolite builder comprises zeolite P having a silcon to aluminium ratio of not g
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Goodrich D. Mitchell
Hertzog Ardith
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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