Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-09-21
2004-03-23
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S235000, C510S421000, C510S422000, C510S426000, C510S499000
Reexamination Certificate
active
06710023
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to hand dishwashing detergent compositions containing polyamines. More particularly, the invention is directed to detergent compositions for hand dishwashing which have improved grease removal performance and benefits in sudsing. The detergents of this invention also have improved low temperature stability properties and superior dissolution, as well as improved tough food stain removal.
BACKGROUND OF THE INVENTION
Typical commercial hand dishwashing compositions incorporate divalent ions (Mg, Ca) to ensure adequate grease performance in soft water. However, the presence of divalent ions in formulas containing anionic, nonionic, or additional surfactants (e.g., amine oxide, alkyl ethoxylate, alkanoyl glucose amide, alkyl betaines) leads to slower rates of product mixing with water (and hence poor flash foam), poor rinsing, and poor low temperature stability properties. Moreover, preparation of stable dishwashing detergents containing Ca/Mg is very difficult due to the precipitation issues associated with Ca and Mg as pH increases. Additionally, hand dishwashing formulations which contain magnesium as well as amine oxide and an anionic surfactant have the added stability problem that at low temperatures, typically about 5° C. or less, the product solidifies. This eliminates a potentially useful surfactant system from any possible combinations with magnesium.
However, the alternatives to a conventional Ca/Mg system while solving the stability problem associated with a conventional Ca/Mg system do not typically provide comparable soft water cleaning.
Consequently, there remains the need for a detergent composition suitable for hand dishwashing, which is stable at low temperatures, and additionally can provide grease removal and tough food cleaning benefits, in hard water and at pH's, typically pH 9 or lower, where a conventional Ca/Mg system would be unstable and not provide grease removal and tough food cleaning benefits, while comparable cleaning to a conventional Ca/Mg system in soft water.
SUMMARY OF THE INVENTION
It has now been determined that the use of polyamines leads to improved cleaning of tough food stains and removal of grease/oil when compared to the use of diamine alone in soft water in conventional detergent compositions. It has also been surprisingly found that the combination of these polyamines with low molecular weight diamines, detailed hereafter, leads to improved cleaning of tough food stains and removal of grease/oil when compared to the use of diamine alone in soft water in conventional detergent compositions. Unexpectedly, these organic diamines also improve suds stability in the presence of soils, esp. soils containing fatty acids and proteins. This combination provides cleaning in soft water which is comparable or better than a conventional Ca/Mg system.
In accordance with a first aspect of the present invention a hand dishwashing detergent composition is provided for, the composition comprises:
(a) surfactant;
(b) polyamine, wherein said polyamine contains at least 3 protonatable nitrogen atoms and at least one pKa above the wash pH (as measured as a 0.2% aqueous solution) and at least two pKa's greater than about 6 and below wash pH (as measured as a 0.2% aqueous solution);
wherein the pH (as measured as 10% aqueous solution) is from about 6.0 to about 12.
In accordance with a second aspect of the present invention a hand dishwashing detergent composition is provided for, the composition comprises:
(a) surfactant;
(b) a low molecular weight organic diamine having a pK1 and a pK2, wherein the pK1 and the pK2 of said diamine are both in the range of from about 8.0 to about 11.5;
(c) a polyamine, wherein said polyamine contains at least 3 protonatable nitrogen atoms and has a molecular weight of from about 140 daltons to about 3000 daltons;
wherein the pH (as measured as 10% aqueous solution) is from about 6.0 to about 11; and the mole ratio of said protonatable nitrogen to moles of anionic surfactant is from about 10:1 to about 1:15, preferably about 6:1 to about 1:10, more preferably about 3:1 to about 1:5.
Accordingly, it is an aspect of the present invention to provide novel cleaning compositions as well as methods of using these novel compositions. These, and other, aspects, features and advantages will be clear from the following detailed description and the appended claims. In the description of the invention various embodiments and/or individual features are disclosed. As will be apparent for the skilled practitioner all combinations of such embodiments and features are possible and can result in preferred executions of the invention. All parts, percentages and ratios used herein are expressed as percent weight unless otherwise specified. All documents cited are, in relevant part, incorporated herein by reference.
DETAILED DESCRIPTION OF THE INVENTION
Definitions—The present detergent compositions comprise an “effective amount” or a “grease removal-improving amount” of individual components defined herein. By an “effective amount” of the diamines herein and adjunct ingredients herein is meant an amount which is sufficient to improve, either directionally or significantly at the 90% confidence level, the performance of the cleaning composition against at least some of the target soils and stains. Thus, in a composition whose targets include certain grease stains, the formulator will use sufficient diamine to at least directionally improve cleaning performance against such stains. Importantly, in a fully-formulated detergent the diamine can be used at levels which provide at least a directional improvement in cleaning performance over a wide variety of soils and stains, as will be seen from the examples presented hereinafter.
As noted, the diamines are used herein in detergent compositions in combination with detersive surfactants at levels which are effective for achieving at least a directional improvement in cleaning performance. In the context of a hand dishwashing composition, such “usage levels” can vary depending not only on the type and severity of the soils and stains, but also on the wash water temperature, the volume of wash water and the length of time the dishware is contacted with the wash water.
Since the habits and practices of the users of detergent compositions show considerable variation, the composition will preferably contain at least about 0.1%, more preferably at least about 0.2%, even more preferably, at least about 0.25%, even more preferably still, at least about 0.5% by weight of said composition of diamine. The composition will also preferably contain no more than about 15%, more preferably no more than about 10%, even more preferably, no more than about 6%, even more preferably, no more than about 5%, even more preferably still, no more than about 1.5% by weight of said composition of diamine.
In one of its several aspects, this invention provides a means for enhancing the removal of greasy/oily soils by combining the specific diamines of this invention with surfactants. Greasy/oily “everyday” soils are a mixture of triglycerides, lipids, complex polysaccharides, fatty acids, inorganic salts and proteinaceous matter.
Depending on consumer preferences, the compositions herein may be formulated at viscosities of over about 50, preferably over about 100 centipoise, and more preferably from about 100 to about 400 centipoise. For European formulations, the compositions may be formulated at viscosites of up to about 1000 centipoise.
Moreover, the superior rate of dissolution achieved by divalent ion elimination even allows the formulator to make hand dishwashing detergents, especially compact formulations, at even significantly higher viscosities (e.g., 1,000 centipoise or higher) than conventional formulations while maintaining excellent dissolution and cleaning performance. This has significant potential advantages for making compact products with a higher viscosity while maintaining acceptable dissolution. By “compact” or “Ultra” is meant detergent formulatio
Bodet Jean-Francois
Kacher Mark Leslie
Murch Bruce Prentiss
Oglesby Janice Lee
Scheper William Michael
Delcotto Gregory
Procter & Gamble Company
Robinson Ian S.
Wei-Berk Caroline
Zerby Kim W.
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