Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1999-03-02
2001-02-13
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S425000, C510S501000, C510S502000
Reexamination Certificate
active
06187733
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to water-based manual dishwashing detergents containing monoglyceride (ether)sulfates and other surfactants and to the use of these mixtures for the production of manual dishwashing detergents.
DISCUSSION OF RELATED ART
Concentrated surfactant solutions are normally used for manual dishwashing. Nowadays, the detergents used have to satisfy a whole number of—in some cases very different—requirements. The detergents are expected
to have 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 generate a rich, stable foam, even in the presence of fats, and of course
to have a high cleaning performance.
Even though the consumer can now choose from a whole range of products, there is still considerable interest both on the part of raw material suppliers and detergent manufacturers and on the part of consumers in formulations which fulfill the complex requirement profile involved better than existing products. Accordingly, the problem addressed by the present invention was to satisfy this requirement.
DESCRIPTION OF THE INVENTION
The present invention relates to water-based manual dishwashing detergents containing
(a) monoglyceride (ether)sulfates,
(b) anionic surfactants and/or
(c) nonionic and/or amphoteric or zwitterionic surfactants.
It has surprisingly been found that the detergents according to the invention are flowable, even in highly concentrated form, have a low cold cloud point, do not irritate the skin largely irrespective of their concentration and, at the same time, generate a rich and stable foam, even in the presence of fats, and have an excellent dishwashing performance. The invention includes the observation that mixtures of cocofatty acid monoglyceride sulfate salts with alkyl sulfates, alkyl ether sulfates, sulfosuccinates, alkyl oligoglucosides and/or betaines lead to a further improvement in the desired properties.
Monoglyceride (ether)sulfates
Monoglyceride sulfates and monoglyceride ether sulfates are known anionic surfactants which may be obtained by the relevant methods of preparative organic chemistry. They are normally produced from triglycerides by transesterification to the monoglycerides, optionally after ethoxylation, followed by sulfation and neutralization. The partial glycerides may also be reacted with suitable sulfating agents, preferably gaseous sulfur trioxide or chlorosulfonic acid [cf. EP-B1 0 561 825, EP-B1 0 561 999 (Henkel)]. If desired, the neutralized products may be subjected to ultrafiltration to reduce the electrolyte content to a desired level [DE-A1 42 04 700 (Henkel)]. Overviews of the chemistry of monoglyceride sulfates have been published, for example, by A. K. Biswas et al. in J. Am. Oil. Chem. Soc. 37, 171 (1960) and by F. U. Ahmed in J. Am. Oil. Chem. Soc. 67, 8 (1990). Machine dishwashing detergents containing short-chain alkyl ether sulfates and, optionally, monoglyceride sulfates are the subject of DE-AS 26 13 283 (Procter & Gamble).
The monoglyceride (ether)sulfates suitable for the purposes of the invention correspond to formula (I):
in which R
1
CO is a linear or branched acyl group containing 6 to 22 carbon atoms, x, y and z together stand for 0 or numbers of 1 to 30 and preferably 2 to 10 and X is an alkali metal or alkaline earth metal cation. Typical examples of monoglyceride (ether)sulfates suitable for the purposes of the invention are the reaction products of lauric acid monoglyceride, cocofatty acid monoglyceride, palmitic acid monoglyceride, stearic acid monoglyceride, oleic acid monoglyceride and tallow fatty acid monoglyceride and ethylene oxide adducts thereof with sulfur trioxide or chlorosulfonic acid in the form of their sodium salts. Monoglyceride sulfates corresponding to formula (I), in which R
1
CO is a linear acyl group containing 8 to 18 carbon atoms, are preferably used.
Anionic surfactants
Other anionic surfactants different from the monoglyceride (ether)-sulfates are optional ingredients of the manual dishwashing detergents according to the invention. 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, alkyl ether sulfates, glycerol 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-acylamino acids such as, for example, acyl lactylates, acyl tartrates, acyl glutamates and acyl aspartates, alkyl oligoglucoside sulfates, protein fatty acid condensates (particularly wheat-based vegetable products) and alkyl (ether)phosphates. If the anionic surfactants contain polyglycol ether chains, the polyglycol ether chains may have a conventional homolog distribution, although they preferably have a narrow homolog distribution. Alkyl sulfates, alkyl ether sulfates and/or sulfosuccinates are preferably used. The detergents according to the invention may contain components (a) and (b) in a ratio by weight of 90:10 to 10:90, preferably 75:25 to 15:85 and more preferably 60:40 to 25:75.
Nonionic and amphoteric surfactants
Typical examples of nonionic surfactants suitable for use as component (c) are fatty alcohol polyglycol ethers, alkyl phenol polyglycol ethers, fatty acid polyglycol esters, fatty acid amide polyglycol ethers, fatty amine polyglycol ethers, alkoxylated triglycerides, alk(en)yl oligoglycosides, fatty acid-N-alkyl glucamides, protein hydrolyzates (particularly wheat-based vegetable products), polyol fatty acid esters, sugar esters, sorbitan esters, polysorbates and amine oxides. If the nonionic surfactants contain polyglycol ether chains, the polyglycol ether chains may have a conventional homolog distribution although they preferably have a narrow homolog distribution. Typical examples of amphoteric or zwitterionic surfactants are alkyl betaines, alkyl amidobetaines, aminopropionates, aminoglycinates, imidazolinium betaines and sulfobetaines. Fatty alcohol polyglycol ethers, alkyl oligoglucosides, fatty acid-N-alkyl glucamides and/or betaines are preferably used. The detergents according to the invention may contain components (a) and (c) in a ratio by weight of 90:10 to 10:90, preferably 75:25 to 25:75 and more preferably 60:40 to 40:60 and components (a), (b) and (c) in a ratio by weight of (10 to 90): (5 to 85): (5 to 85) and, more particularly, (20 to 80): (10 to 50): (10 to 50), with the proviso that the quantities by weight shown add up to 100% by weight, based on components (a), (b) and/or (c).
Commercial Applications
The present invention relates to the use of the surfactant mixtures according to the invention for the production of manual dishwashing detergents. In this connection, the mixtures may contain small quantities of other typical auxiliaries and additives such as, for example, foam boosters, fragrances, etc. The detergents normally have an active substance or surfactant content, based on components (a), (b) and/or (c), of 10 to 50% by weight and preferably 15 to 35% by weight.
REFERENCES:
patent: 4024078 (1977-05-01), Gilbert et al.
patent: 5304669 (1994-04-01), Wangemann et al.
patent: 5312932 (1994-05-01), Behler et al.
patent: 5322957 (1994-06-01), Fabry et al.
patent: 5484531 (1996-01-01), Kuehne et al.
patent: 5489395 (1996-02-01), Behler et al.
patent: 5599476 (1997-02-01), Behler et al.
patent: 26 13 283 (1976-10-01), None
patent: 42 04 700 (1993-08-01), None
patent: 43 03 176 (1994-08-01), None
patent: 44 38 221 (1996-05-01), None
patent: 0 561 999 (1993-09-01), None
patent: 0 561 825 (1993-09-01), None
patent: 50-070322 (1975-06-01), None
patent: WO92/06952 (1992-04-01), None
patent: WO94/00543 (1994-01-01), None
p
Fabry Bernd
Weuthen Manfred
Drach John E.
Henkel Kommanditgesellschaft auf Aktien
Ogden Necholus
Trzaska Steven J.
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