Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1999-07-09
2001-05-01
Gupta, Yogendra (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, C510S237000
Reexamination Certificate
active
06225272
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to dishwashing detergents with enhanced cleaning power, particularly against dried-on and burnt-on soil, consisting of a surfactant mixture and water-soluble abrasive components.
If conventional manual dishwashing detergents are used in attempts to remove dried-on and burnt-on soil, the performance limit of the products is soon encountered. Now, the problem addressed by the present invention was to formulate a manual dishwashing detergent which would contain a soluble abrasive component in addition to the surfactant mixtures otherwise typical of this group of products. When used in a concentrated formulation, this component would facilitate the removal of obstinate soils. When used after dilution, the product would have the performance profile of high-quality manual dishwashing detergents.
DISCUSSION OF RELATED ART
Detergents containing soluble abrasive components are known from the prior art. According to U.S. Pat. No. 4,179,414 (Mobil Oil), a paste containing 50 to 65% by weight of sodium bicarbonate is used for cleaning hard surfaces. U.S. Pat. No. 3,981,826 (Procter & Gamble) describes a water-soluble, non-aqueous, liquid, paste-form or gel-form abrasive detergent composition containing a dispersion of a water-miscible liquid medium with a solid, water-soluble anionic surfactant and, in addition, a solid, particulate, water-soluble inorganic salt stabilized with a suspending agent.
According to U.S. Pat. No. 4,051,055 (Procter & Gamble), up to 50% by weight of sodium bicarbonate is used as a buffer reagent or detergent builder for a cleaning composition for cleaning porcelain or enamel surfaces, the composition additionally containing hypochloride, a fluoride salt and day with cation-exchanging properties.
International patent application WO 90/04630 (Henkel Corporation) claims an aqueous composition for the spray-drying of detergents which contains 8 to 25% by weight of surfactants, 25 to 60% by weight of sodium carbonate, 10 to 40% by weight of a builder component, 15 to 35% by weight of sodium sulfate, 0.5 to 5% by weight of additives, 0.5 to 10% by weight of alkyl polyglycoside and 0.5 to 10% by weight of sodium chloride.
European patent application EP 110 106 (Henkel) describes aqueous, storage-stable, liquid or paste-form cleaning or scouring compositions with stable active ingredients which contain from 0 to 60% by weight and preferably 10 to 50% by weight of an abrasive component with a particle size of 1 to 200 micrometers (&mgr;m).
European patent EP 193 375 (Unilever) describes a pourable, homogeneous, abrasive cleaning composition for hard surfaces which, in addition to a surfactant, is said essentially to contain a water-soluble salt in quantities above its saturation limit, the undissolved particles of this salt having a temporary abrasive effect. Sodium bicarbonate is preferably used. Undissolved abrasive particles can only be introduced into these cleaning compositions for hard surfaces in quantities of up to 45% by weight.
European patent EP 334 566 (Unilever) describes pourable, homogeneous aqueous detergent compositions containing a water-soluble abrasive component which at least partly contains sodium sulfate and which is suitable for manual dishwashing. The composition is said to be self-thickening, i.e. not to require the addition of thickeners, and to contain at least 30 to 89.5% by weight and preferably 45 to 70% by weight of water. The compositions are said to have an apparent viscosity at 20° C. of at least 6,500 Pas at a shear rate of 3×10
−5
s
−1
and no more than 10 Pas at a shear rate of 21 s
−1
.
European patent EP 502 030 (Unilever) claims a shear-diluting, liquid scouring composition with a pH value of 7 to 13 which contains more than 10% by weight of water, 1.5 to 30% by weight of a detergent active compound, more than 45% by weight and up to 75% by weight of sodium bicarbonate in the form of undissolved particles with a certain volume particle diameter of less 80 micrometers, a certain particle diameter distribution range of 1 to 3 and an apparent viscosity of at least 400 Pas at a shear rate of 3×10
−5
s
−1
and at a temperature of 20° C. and an apparent viscosity of no more than 10 Pas at 21 s
−1
/20° C.
However, none of the compositions proposed in the prior art is suitable as a high-performance, dermatologically compatible, temperature- and storage-stable, pourable and ecologically particularly safe manual dishwashing detergent which is capable of removing obstinate soil, which contains large water-soluble abrasive components, for example at least 150 micrometers (&mgr;m) and preferably 200 micrometers in diameter, and which can be produced without any problems.
Relatively voluminous abrasive components have the advantage of an improved cleaning effect against burnt-on soil, but are attended by the disadvantage of relatively poor suspendability in concentrated form and, along with that, poor stability in storage.
Further improved cleaning performance against burnt-on soil is obtained where relatively large quantities of sodium bicarbonate are used as the water-soluble abrasive component (for example more than 45% by weight). If quantities as large as these are incorporated in the surfactant mixtures typical of this class of detergents, i.e. surfactant mixtures of anionic surfactants, such as fatty alcohol ether sulfate or fatty alcohol sulfate, nonionic surfactants, such as alkyl polyglycoside, and zwitterionic surfactants, for example betaines, the products obtained are often highly viscous, poorly soluble and difficult to dose. If additional solvents are used to reduce viscosity, the stability of the dispersion in storage deteriorates, often dramatically, so that stable, high-performance manual dishwashing detergents containing large, solid, water-soluble abrasive components in large quantities cannot be produced from the information available in the prior art.
DESCRIPTION OF THE INVENTION
Storage-stable products with good pouring properties and excellent cleaning performance against dried-on and burnt-on soil, coupled with very favorable properties when used in dilute form, are obtained by incorporating a mixture of fatty alcohol ether sulfate, optionally fatty alcohol sulfate, alkyl polyglycoside and betaine together with sodium bicarbonate having an average particle diameter of more than 150 micrometers, preferably 200 micrometers, as water-soluble abrasive component and an electrolyte, such as sodium chloride or magnesium chloride, and a polyol system.
Accordingly, the present invention relates to a manual dishwashing detergent containing anionic surfactants, alkyl polyglycosides and betaine surfactants and between 46 and 50% by weight of sodium bicarbonate with a mean particle diameter of more than 150 micrometers (&mgr;m), preferably 200 micrometers, as water-soluble abrasive component and an additional electrolyte, preferably between 0.5 and 10% by weight, and 0 to 5% by weight and preferably 0.5 to 5% by weight of solvent preferably selected from polyethylene glycols.
Anionic surfactants suitable for use in accordance with the present invention are aliphatic sulfates, such as fatty alcohol sulfates, fatty alcohol ether sulfates, dialkyl ether sulfates, monoglyceride sulfates, and aliphatic sulfonates, such as alkane sulfonates, olefin sulfonates, ether sulfonates, n-alkyl ether sulfonates, ester sulfonates and lignin sulfonates. Fatty acid cyanamides, sulfosuccinic acid esters, fatty acid isethionates, acyl aminoalkane sulfonates (fatty acid taurides), fatty acid sarcosinates, ether carboxylic acids and alkyl (ether)phosphates may also be used in accordance with the invention.
Fatty alcohol ether sulfates are particularly preferred for the purposes of the present invention. Fatty alcohol ether sulfates are products of sulfation reactions with alkoxylated alcohols. Alkoxylated alcohols are generally understood among experts to be the reaction products of alkylene oxide, preferably ethylene oxide, with alcohols, relatively lon
Giesen Brigitte
Hofmann Rainer
Legel Dieter
Middelhauve Birgit
Zaika Dagmar
Connolly Bove & Lodge & Hutz LLP
Gupta Yogendra
Henkel Kommanditgesellsehaft auf Aktien
Petruncio John M.
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