Bar soaps containing ether sulfates and oligoglycosides

Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...

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510151, 510152, 510153, 510155, 510440, 510447, 510450, 510470, 510472, 510481, 510484, 510485, 510491, 510495, 2523671, C11D 926, C11D 1004, C11D 1700

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057054622

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to bar soaps containing fatty acid salts, fatty acids, alkyl ether sulfates, alkyl and/or alkenyl oligoglycosides and optionally other auxiliaries and additives.
2. Statement of the Related Art
Modern bar soaps, more particularly toilet soaps, are normally based on mixtures of beef tallow and coconut oil in a ratio of approximately 8:2. This fatty mixture is hydrolyzed by addition of sodium hydroxide to the base soap to which other additives, including for example humectants, fillers and binders, superfatting agents, dyes and perfumes, etc., are added. Toilet soaps normally contain around 80% of fatty acid salts, 10% of water and ad 100% auxiliaries and additives. The large number of products offered to the consumer reflect the vigorous market interest and, at the same time, make it clear that there is a constant demand among consumers for further improved products distinguished in particular by improved dermatological compatibility, greater foaming power, greater creaminess, refatting, removability by rinsing, feeling on the skin and the like. By contrast, soap manufacturers are looking for soap formulations which, for example, lead to bars of greater breaking strength or which enable certain surfactants, for example alkyl sulfates, to be readily incorporated. An overview on this subject can be found, for example, in J. Am. Oil. Chem. Soc. 59, 442 (1982).
So far as the production of bar soaps is concerned, it is readily possible to look back over a very large number of known processes. A clear distinction has to be made in this regard between synthetic "soap-free" soaps, so-called syndets, and in particular combinations of fatty acid salts and synthetic surfactants ("combination bars"). According to EP-A 0 176 330 (Unilever), for example, combination bars are produced by combining fatty acid soaps with salts of isethionic acid. The use of fatty acid isethionates as a synthetic ingredient of combination bars is known from EP-A 0 189 332, EP-A 0 472 320 and EP-A 0 508 006 (Unilever).
Recently, increasing interest has also been shown in alkyl glucosides as a class of nonionic mild surfactants for the production of toilet soaps. For example, it is proposed in a technical bulletin published by Rohm & Haas on "Triton CG-110" to add this C.sub.8-10 alkyl oligoglucoside to a base soap in quantities of 2% by weight. It is known from DE-AS 593 422 (Th. Boehme) that the addition of 10 to 15% by weight of acetyl maltoside to a base soap mixture produces an improvement in washing power.
U.S. Pat. No. 4,536,318 and 4,599,188 (Procter & Gamble) describe foaming mixtures of alkyl glucosides and soaps which are described as being basically suitable for the production of bar soaps. In addition, toilet soaps containing cationic polymers in addition to soaps and alkyl glucosides are known from European patent applications EP-A 0 227 321, EP-A 0 308 189 and EP-A 308 190 (Procter & Gamble).
According to the teaching of U.S. Pat. No. 5,043,091 (Colgate), the addition of alkyl glucosides to soaps containing alkyl benzenesulfonates and alkyl sulfates can improve their mechanical properties at the production stage.
European patent application EP-A 0 463 912 (Colgate) describes toilet soaps containing 45 to 95% by weight of C.sub.8-24 fatty acid soaps, 1 to 20% by weight of alkyl glucosides, humectants and optionally anionic surfactants and/or fatty acids. However, this document specifically recommends using alkyl glucosides in quantities well above 1.5% by weight. In addition, although alkyl ether sulfates are mentioned as possible anionic so-surfactants, the Examples only disclose combinations of fatty acids, soaps and alkyl glucosides.
Despite the extensive prior art, the known solutions are still not entirely satisfactory. More particularly, the processability of the soap (smoothness, colour stability on exposure to high temperatures), the creaminess of the lather and its resistance to water hardness are still unsatisfactory.
Accordingly, the problem

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Hollstein et al., "Manufacture and Properties of Synthetic Toilet Soaps", J. Am. Oil Chem. vol. 59, No. 10, Oct. 1982, pp. 442-448.

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