Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-05-02
1999-11-09
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
554 68, 554187, 554188, 554 96, 554 97, 554 98, 554 99, 554190, A61K 748, A61K 750
Patent
active
059814535
DESCRIPTION:
BRIEF SUMMARY
The object of the present invention is a novel process for the preparation of tenside mixtures.
As is known, cleansing agents, such as hair washing shampoos, are based on tensides, that is on surface active agents, which usually are anion-active, non-ionic or amphoteric. Typical anion-active agents are long chained alkyl or alkyl aryl sulfate and sulfonate salts, such as alkali metal, typically sodium salts, or organic salts, such as di- and/or triethanolamine salts. Non-ionic surface active agents for use in cleansing compositions are, for example, ethoxylated fatty acid alkylamides and -esters.
From the patent literature a number of publications are known which relate to the use of different combinations of surface active agents in various cleansing compositions. As an example, EP patent application 232 153 may be mentioned, which relates to a detergent especially for washing dishes by hand, which besides an anionic detergent contains anionic alkyl ether sulfate (ethoxylated alkyl sulfate), foam improving agent, and in addition non-ionic, e g. polyethoxylated alcohol or alkanolamide.
A shampoo intended e.g. for washing hair must not remove fat too effectively and it has to improve the shapeability of the hair. Shampoos for use in washing hair cannot be used as technical shampoos, for example for washing cars, due to their tendency to hydrolysis, which leads to a metal and paint corroding effect. In car shampoos, the triethanolamine salt of alkyl benzene sulfonates is used as the surface active ingredient, which does not corrode metal and does not leave stains on the paint surface. Such agents are, however, associated with negative health effects, which prevent their use, for example, for washing hair or as bath foam.
The foam stability of a bath foam has to good also at small concentrations, and it should facilitate the absorption of biologically beneficial substances through the skin.
Certain special properties are required also of shampoos intended for the treatment of rugs and hides.
The different tensides forming the base of the various shampoos also have to be compatible with the remaining components of the formula and ensure the homogeneity and clarity of the shampoo also under extended storage.
The manufacturing methods of the known shampoos are multi-stage erratic processes, labour intensive and thus economically unfavourable, and they do not lead to products with optimal quality properties.
Thus there is a need for such a basic tenside mixture which easy and economical to manufacture in pure form from easily available starting materials, and from which, by suitably adding adjuvants and additional tensides, products suitable for various applications are obtained.
Thus the object of the present invention is a process for the preparation of a cleansing composition which can be used in different technical and domestic fields, including personal hygiene, and which have improved quality properties.
The process according to the invention is characterized in that a mixture, which contains concentrated, over 70% sulfuric acid in an amount excessive of the amount needed for liberating the organic acids, while stirring and simultaneously cooling, if necessary, so that the temperature of the mixture rises to at the most 35.degree. C., di- and/or triethanolamine to produce the di- and/or triethanolamine salts of the said acids, and optionally water and conventional additional agents and adjuvants are added.
As the alkyl sulfonate forming the main component of the method according to the invention, advantageously an alkali metal salt of an acid of the formula secondary alkyl group with 6 to 18 carbon atoms, or a mixture of alkyl groups. In the secondary alkyl group, the secondary carbon atom is attached to the sulfur atom (i.e. of the type R'R"CH-, where R' and R" are alkyl groups).
Such substances are commercially available, or they may be manufactured by known methods. A substance or mixture of substances suitable for the purpose is the sodium salt of C.sub.10 -C.sub.18 -alkyl sulfonic acid sold under the t
REFERENCES:
patent: 3804819 (1974-04-01), Wengrow et al.
patent: 4753747 (1988-06-01), Clark et al.
patent: 5308372 (1994-05-01), Daniels
Gupta Yogendra
Oy Faintend Ltd.
Webb Gregory E.
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