Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Patent
1997-10-24
1999-09-28
Gupta, Yogendra N.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
510119, 510123, 510130, 510235, 510237, 510470, 510477, 510490, 510502, C11D 322, C11D 332, C11D 190
Patent
active
059588683
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a process for the production of aqueous surfactant concentrates containing selected sugar surfactants and betaines which are distinguished by improved performance properties.
DISCUSSION OF THE RELATED ART
Sugar surfactants, such as for example alkyl oligoglycosides and, more particularly, alkyl oligoglucosides, are nonionic surfactants which are acquiring increasing significance by virtue of their excellent detergent properties and their high ecotoxicological compatibility. The production and use of these substances have been described just recently in a number of synoptic articles, of which the articles by H. Hensen in Skin Care Forum, 1, (October 1992), D. Balzer and N. Ripke in Seifen-Ole-Fette-Wachse 118, 894 (1992) and B. Brancq in Seifen-Ole-Fette-Wachse 118, 905 (1992) are cited as examples. The same applies to a second group of sugar surfactants, namely fatty acid-N-alkyl polyhydroxyalkylamides and preferably fatty acid-N-alkyl glucamides.
Various binary mixtures of sugar surfactants of the type mentioned with other surfactants are known from the prior art. Among these surfactant compounds, combinations of sugar surfactants, more particularly alkyl oligoglucosides, with betaines occupy a special position because foaming and cleaning power and also skin-cosmetic compatibility are improved over a broad molar fraction range. For example, German patent application DE-A1 42 34 487 (Henkel) describes a manual dishwashing detergent containing fatty alcohol sulfates and fatty alcohol ether sulfates in addition to alkyl glucosides and betaines. According to the teaching of DE-A1 43 11 114 (Henkel), mixtures of alkyl glucosides, betaines and selected fatty alcohol polyglycol ethers may be used for the same purpose. Finally, DE-A1 40 09 616 (Henkel) describes liquid body-are formulations containing protein fatty acid condensates in addition to alkyl glucosides and betaines.
However, all the known formulations are more or less dilute aqueous solutions whereas the objective of any manufacturer of alkyl glucoside/betaine mixtures must be to make highly concentrated products which afford distinct advantages in regard to storage. Unfortunately, the production of corresponding concentrates is attended by a number of disadvantages: mixtures of alkyl glucosides and betaines which are generally alkaline from their production are viscous and often cloudy at solids contents of 40 to 60% by weight. In addition, their stability in storage is not always satisfactory, i.e. their viscosity can continue to increase with time through the formation of liquid crystalline gel phases and/or the products undergo crystallization. This naturally leads to a very considerable reduction in the economic value of corresponding concentrates.
Accordingly, the complex problem addressed by the present invention was to provide a process for the production of binary surfactant concentrates which would be free from the disadvantages mentioned above.
DESCRIPTION OF THE INVENTION
The present invention relates to a process for the production of water-containing surfactant concentrates with a solids content of 35 to 65% by weight and preferably 40 to 60% by weight, containing the concentrates are adjusted to a pH value of 3.5 to 6 and preferably 4 to 6.
It has surprisingly been found that mixtures of sugar surfactants and betaines, which are normally viscous and cloudy at alkaline pH values, readily become low in viscosity and clear when the pH value of the mixtures is reduced to the acidic range. This measure also has a positive effect on the stability of the products in storage, i.e. the concentrates show a constant low viscosity, even in the event of prolonged storage, and have relatively little tendency towards crystallization. The present invention also includes the observation that viscous surfactant concentrates can be reduced in their viscosity and clouding can be eliminated by subsequent adjustment of the pH value.
Alkyl and alkenyl oligoglycosides are known substances which correspond
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Bigorra Llosas Joaquim
Bonastre Gilabert Nuria
Pi Subirana Rafael
Prat Queralt Ester
Boyer Charles
Gupta Yogendra N.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Murphy Glenn E.J.
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