Cleaning and liquid contact with solids – Processes – Work handled in bulk or groups
Patent
1999-09-01
2000-11-28
DelCotto, Gregory R.
Cleaning and liquid contact with solids
Processes
Work handled in bulk or groups
510101, 510235, 510421, 510426, 510432, 510505, 510492, B08B 304, C11D 320, C11D 334, C11D 350
Patent
active
061521523
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to liquid dishwashing detergent compositions. The compositions have antibacterial properties.
BACKGROUND
Liquid dishwashing compositions are much desired by consumers and can be used neat or diluted. In diluted mode, a composition is diluted in water to form a wash liquor in which the dishes to be cleaned are immersed. In neat mode, a composition is directly applied neat onto dishes, and in this mode a dish implement is often use. Specifically, the composition is applied onto the implement, usually a sponge or a dishcloth, which is in turn contacted with the dishes to be cleaned.
A problem arises that dish implements are left humid most of the time, and so they provide a good medium for bacterial growth. The contaminated implement which is used to clean dishes will in turn contaminate those dishes.
We have now found that certain dishwashing compositions can fulfill the further purpose of reducing or eliminating bacterial growth on dish implements.
SUMMARY OF THE INVENTION
The compositions of the present invention are liquid dishwashing compositions comprising: sulfonate, toluene sulfonate, xylene sulfonate, benzene sulfonate or mixtures thereof; and
The invention further encompasses a method of washing dishes with these compositions. Without wishing to be bound by theory, it is believed that the anti bacterial efficacy of said formulations is mainly driven by a synergy between the hydrotrope(s) and the unsaturated aliphatic terpene alcohol(s) or derivative.
DETAILED DESCRIPTION OF THE INVENTION
The compositions of the invention are aqueous liquid compositions. They typically comprise from 30% to 90% by weight of the total composition of water, preferably 40% to 85%.
The compositions herein are liquid and so they typically have a viscosity of from 5 cps to 2000 cps, preferably 5 cps to 400 cps, most preferably 5 cps to 350 cops, measured with a Brookfield Viscometer, with a No. 18 spindle, at 20.degree. C.
The compositions of the present invention comprise, as an essential ingredient, one or several of the following surfactants. Suitable for use herein are amine oxides according to the formula: ##STR1## wherein R.sub.2 represents a straight or branched alkyl or alkenyl group having 10 to 16 carbon atoms, and R.sub.3 and R.sub.4 represent a C.sub.1 to C.sub.4 hydrocarbon chain, preferably a methyl group or an ethyl group. Generally, when the number of carbon atoms in R.sub.2 is less than 10, the detergency of the composition is lowered, while if it exceeds 16, the stability of the composition at low temperatures deteriorates.
Also suitable for use herein are alkyl alkoxylated sulfates of the formula R.sub.1 O(A).sub.n SO.sub.3 M, wherein R.sub.1 is an alkyl or alkenyl group having 9 to 15 carbon atoms, A is an alkoxy group, preferably ethoxy or propoxy, most preferably ethoxy, n represents 0.5 to 7 of real number in average, and M is an alkalimetal, alkali earth metal, ammonium or alkanolammonium group.
The use of alkyl alkoxylated sulfates with lower values for n, on an equal weight basis, typically when n is below 1.0, improves the performance of the composition on grease removal and sudsing due to the corresponding increase in moles of anionic but results in an increase in the total amount of unalkoxylated alkyl sulphate, and this seems to make the low temperature instability issue more acute. If different alkyl alkoxylated sulfates are used which have different n values, the resulting average n value of the alkyl alkoxylated sulfate in the composition will be the weighted molar average n value of the individual n values of the different alkyl alkoxylated sulfates used in the composition.
If the average n value is less than 0.5, the stimulus to skin increases and this is not desirable. On the other hand, if the average n value is more than 3, the detergency deteriorates.
Concerning R.sub.1, if the average number of carbon atoms in R.sub.1 is less than 9, the detergency is insufficient, while if it is more than 16, the stability at low temperature deteriorate
REFERENCES:
patent: 4767563 (1988-08-01), De Buzzaccarini
patent: 5281354 (1994-01-01), Faber
patent: 5538664 (1996-07-01), Michael
Aryana Nikipad
Reynen Michael Jakob
Delcotto Gregory R.
Miller Steven W.
Robinson Ian S.
The Procter & Gamble & Company
Zerby Kim William
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