Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-08-03
2003-02-18
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...
C510S423000, C510S424000, C510S427000, C510S433000, C510S434000, C510S435000, C510S499000, C510S503000
Reexamination Certificate
active
06521577
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to detergent compositions containing low molecular weight organic diamines and magnesium. 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, and antibacterial properties.
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.
Sodium chloride is a typical additive to hand dishwashing compositions. It is a common formulation additive, typically as an electrolyte to make the composition overall electrically neutral. However, this addition of sodium chloride has it's drawbacks as it is believed to increase the corrosion of the metal surfaces which the compositions containing sodium chloride contact. Reduction, if not total elimination of this added electrolyte is highly desired by formulators.
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 soft 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. Furthermore, the need remains for a way of reducing or totally eliminating sodium chloride in hand dishwashing compositions.
BACKGROUND ART
U.S. Pat. Nos. 4,556,509, 4,077,896 and 5,484,555; and JP 63131124-A 88/06/03.
SUMMARY OF THE INVENTION
It has now been determined that the use of certain organic diamines, as outlined in detail below, in combination with magnesium ions at less than or equimolar amounts 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. Furthermore, it has been surprisingly found that this novel combination of magnesium salt and diamine means that the addition of sodium chloride can be reduced, if not totally eliminated.
In accordance with a first aspect of the present invention a hand dishwashing detergent composition is provided for, the composition comprises:
a) 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;
b) an anionic surfactant;
c) an amine oxide;
d) magnesium ions; and
wherein the pH (as measured as 10% aqueous solution) is from about 5.0 to about 12.5; and the magnesium ions are present at an equimolar or less than equimolar amount of the diamine wherein mole ratio of the anionic surfactant to the amine oxide to the diamine is from about 100:40:1 to about 9:0.5:1.
In accordance with a second aspect of the present invention a hand dishwashing detergent composition is provided for, the composition comprises:
a) from about 0.1% to about 15%, by weight of an organic diamine having a molecular weight less than or equal to 400 g/mol;
b) an anionic surfactant;
c) amine oxide;
d) from about 0.01% to about 5% by weight of magnesium ions; and
e) less than about 1% by weight of sodium chloride;
wherein the pH (as measured as 10% aqueous solution) is from about 5.0 to about 12.5; and the magnesium ions are present at an equimolar or less than equimolar amount of the diamine wherein mole ratio of the anionic surfactant to the amine oxide to the diamine is from about 100:40:1 to about 9:0.5:1.
It has been surprisingly found that when magnesium ions are used in the present inventive hand dishwashing compositions at equimolar or less than equimolar amount of diamine the soft water cleaning of the composition improves. Furthemore, this inventive combination of magnesium and diamine surprisingly does not suffer from the stability problems when in combination with amine oxide and an anionic surfactant. The compositions of the present invention are stable at 0° C., where as compositions with greater than equimolar amounts of magnesium than diamine (and outside the scope of the present invention) show no such stability, and fail after a few days at 0° C.
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. 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, in
Castro Artemio
Clarke Joanna Margaret
Embleton Gary Kenneth
Ofosu-Asante Kofi
Owens Robert
Delcotto Gregory
The Procter & Gamble & Company
Waugh Kevin L.
LandOfFree
Hand washing detergent compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hand washing detergent compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hand washing detergent compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3170599