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By A.V. BELOZYOROV,

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E. increase the foam volume or keep it at a high level. Figure 20 shows by way of example the influence of C12/14-APG on the foaming capacity of FAS and FAES. (c) Dermatological Behavior. Manual dishwashing detergents belong to the category of products which very frequently come into contact with the skin of the consumer, albeit in dilute form. Accordingly, the skin compatibility of this group of products is of particular interest. Alkyl polyglycosides are not only mild on the skin, but can significantly reduce the skin irritation of anionic surfactants.

In the alkyl polyglycoside–containing paste, 2% of the active LAS in the market product was replaced by 1% of the active FAES: C12/14-APG (3:1). The results prove that even the use of small quantities of APG can lead to a distinct improvement in performance. The clear pastes are also based on LAS. They contain large quantities of hydrotropes. Examples of alkyl polyglycoside containing pastes which may be both transparent and opalescent in appearance are given in Table 9. The hardness of the pastes can be controlled either through the pH value (low pH value = soft paste) or through the concentration of fatty acid.

An area of low-viscosity o/w microemulsions extends from the C8–14-APG/SLES corner along the surfactant/oil axis up to an oil content of 14%. At point (b), the microemulsion consists of 24% surfactants, 4% coemulsifier, and 12% oil, representing an oil-containing surfactant concentrate with a viscosity of 1600 mPa·s at 1 s–1. Alkyl Polyglycosides 21 The lamellar area is followed by a second microemulsion are at point (c). This microemulsion is an oil-rich gel with a viscosity of 20,000 mPa·s at 1 s–1 (12% surfactants, 8% coemulsifier, 20% oils) and is suitable as a refatting foam bath.

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