Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-03-21
2003-08-05
Boyer, Charles (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S220000, C510S289000, C510S384000, C510S405000, C510S421000, C510S237000
Reexamination Certificate
active
06602838
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to water-containing manual dishwashing detergents containing alkoxylated carboxylic acid esters, more particularly those which have been produced by reacting carboxylic acid esters and alkylene oxides in the presence of calcined hydrotalcites, and other surfactants and to the use of the alkoxylated carboxylic acid esters as surfactants for the production of manual dishwashing detergents.
“Dirty” dishes are manually cleaned with liquid or concentrated surfactant solutions which are now expected to meet various, in some cases very different requirements. The detergents are expected
to lend themselves to formulation as concentrates with a high active substance content,
to be liquid or at least flowable,
to have a low cold cloud point,
to be dermatologically safe, i.e. not to irritate the skin, even in concentrated form,
to develop a vigorous stable foam, even when fats have accumulated in large amounts in the wash liquor and, of course,
to have a high dishwashing performance.
Even though a large number of products is presently available on the market, there is still a keen interest both on the part of the raw material supplier and the product manufacturers and on the part of the consumer in preparations which satisfy the complex requirements stated above better than known products.
Alkoxylated carboxylic acid esters obtained by homogeneous catalysis in the presence of hydroxides and reducing agents or a co-catalyst are known from DE-A1 19 611 999 and International patent application WO 94/13618. According to both these documents, the esters in question may be used in laundry detergents, dishwashing detergents and cleaners.
In addition, DE-A- 43 26 112 describes low-foaming multipurpose cleaners containing alkoxylated carboxylic acid esters in admixture with alkyl glycosides and optionally other surfactants, such as alkyl sulfates, alkylether sulfates and fatty alcohol polyglycol ethers. These known multipurpose cleaners are intended for the cleaning of hard surfaces, such as clinker bricks, ceramic tiles, enamel, PVC, glass or wood floors. In contrast to manual dishwashing detergents, however, multipurpose cleaners do not have to clean surfaces heavily soiled with fats and proteins. In addition, dermatological compatibility is much more important in the case of manual dishwashing detergents.
Now, the problem addressed by the present invention was to provide manual dishwashing detergents which would meet the stringent requirements of both consumer and manufacturer.
The present invention relates to water-based manual dishwashing detergents containing
a. alkoxylated carboxylic acid esters and
b. anionic surfactants and/or
c. amphoteric or zwitterionic surfactants.
It has surprisingly been found that the detergents according to the invention can be formulated as concentrates with a high active substance content, do not irritate the skin irrespective of their concentration and, at the same time, produce a rich foam which is stable even to high levels of fats and have excellent dishwashing performance. The invention includes the observation that mixtures with alkyl sulfates, alkylether sulfates, monoglyceride sulfates, sulfosuccinates, alkyl glycosides and/or betaines lead to a further improvement in the properties. It has also been found that the manual dishwashing detergents according to the invention may readily be formulated with antibacterial agents.
Alkoxylated Carboxylic Acid Esters
Alkoxylated carboxylic acid esters, which are a compulsory constituent of the detergents according to the invention, are known from the prior art. They may be obtained, for example, by esterification of alkoxylated carboxylic acids with alcohols. For the purposes of the present invention, however, the compounds are produced by reaction of carboxylic acid esters with alkylene oxides using catalysts, more especially calcined hydrotalcite in accordance with DE-A-39 14 131, which give compounds with a narrow homolog distribution. Carboxylic acid esters of both monohydric alcohols and dihydric alcohols can be alkoxylated by this process. Alkoxylated carboxylic acid esters of monohydric alcohols corresponding to general formula (I):
in which R
1
CO is an aliphatic acyl group derived from a carboxylic acid, AlkO stands for alkylene oxide and R
2
is an aliphatic alkyl group derived from a monohydric aliphatic alcohol, are preferred for the purposes of the invention. Alkoxylated carboxylic acid esters of formula (I), in which R
1
CO is an aliphatic acyl group containing 6 to 22 carbon atoms, AlkO stands for a CH
2
CH
2
O—, CHCH
3
CH
2
O— and/or CH
2
—CHCH
3
O group, n has an average value of 3 to 20 and R
2
is an aliphatic alkyl group containing 1 to 22 carbon atoms, are particularly suitable.
Preferred acyl groups are derived from carboxylic acids containing 6 to 22 carbon atoms of natural or synthetic origin, more especially from linear, saturated and/or unsaturated fatty acids, including the technical mixtures thereof obtainable by lipolysis from animal and/or vegetable fats and oils, for example from coconut oil, palm kernel oil, palm oil, soya oil, sunflower oil, rapeseed oil, cottonseed oil, fish oil, bovine tallow and lard. Examples of such carboxylic acids are caproic acid, caprylic acid, 2-ethyl hexanoic acid, capric acid, lauric acid, isotridecanoic acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselic acid, linoleic acid, linolenic acid, elaeostearic acid, arachic acid, gadoleic acid, behenic acid and/or erucic acid.
Preferred alkyl groups are derived from primary, aliphatic monohydric alcohols containing 1 to 22 carbon atoms which may be saturated and/or unsaturated. Examples of suitable monoalcohols are methanol, ethanol, propanol, butanol, pentanol and the hydrogenation products of the above-mentioned carboxylic acids containing 6 to 22 carbon atoms, more particularly methanol.
AlkO stands for the alkylene oxides which are reacted with the carboxylic acid esters and which comprise ethylene oxide, propylene oxide and/or butylene oxides, preferably ethylene oxide and/or propylene oxide and more particularly ethylene oxide on its own.
Alkoxylated carboxylic acid esters of formula (I), in which AlkO stands for a CH
2
CH
2
O group, n has an average value of 5 to 15 and R
2
is a methyl group, are particularly suitable. Examples of such compounds are lauric acid methyl ester, coconut fatty acid methyl ester and tallow fatty acid methyl ester alkoxylated with, on average, 5, 7, 9 or 11 moles of ethylene oxide.
Anionic Surfactants
Typical examples of anionic surfactants suitable for use as component (b) are soaps, alkyl benzenesulfonates, alkane sulfonates, olefin sulfonates, alkyl ether sulfonates, glycerol ether sulfonates, &agr;-methyl ester sulfonates, sulfofatty acids, alkyl sulfates, alkylether sulfates, glycerol ether sulfates, monoglyceride (ether) sulfates, hydroxy mixed ether sulfates, fatty acid amide (ether) sulfates, mono- and dialkyl sulfosuccinates, mono- and dialkyl sulfosuccinamates, sulfotriglycerides, amide soaps, ether carboxylic acids and salts thereof, fatty acid isethionates, fatty acid sarcosinates, fatty acid taurides, N-acyl amino acids such as, for example, acyl lactylates, acyl tartrates, acyl glutamates and acyl aspartates, alkyl oligoglucoside sulfates, protein fatty acid condensates (more particularly vegetable wheat-based products) and alkyl (ether)phosphates. Where the anionic surfactants contain polyglycol ether chains, they may have a conventional homolog distribution although they preferably have a narrow homolog distribution. Alkyl sulfates, alkyl ether sulfates, alkane sulfonates, monoglyceride sulfates, sulfosuccinates and/or fatty acid polyglycol ester sulfates are preferably used.
Preferred fatty acid polyglycol ester sulfates are compounds which are obtained by sulfation in known manner of fatty acid alkoxylates onto which an average of 1 to 3 moles of alkylene oxide have been added. Fatty acid alkoxylates such as these are obtainable by add
Behler Ansgar
Elsner Michael
Koester Rita
Neuss Michael
Schmid Karl-Heinz
Boyer Charles
Cognis Deutschland GmbH & Co. KG
Drach John E.
Trzaska Steven J.
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