By E. Spiess (auth.), D. F. Williams, W. H. Schmitt (eds.)
Organized on a product classification foundation, this quantity presents an updated assessment of the cosmetics and toiletries in a quite simply digestible shape. Authors speak about the reason of uncooked fabrics choice, the formula and improvement of goods that meet the calls for of a global industry position, product performances, and protection and caliber aspects.
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A common example is the use of coconut fatty acid diethanolamide to stabilise the foam and improve the coarse texture of the foam obtained with ether sulphates. In addition, the diethanolamide wiIl help prevent excessive degreasing ofthe hair (superfatting effect). 2. erude, but reasonably effective in their primary function of washing the hair, products of this type are available on the market in the 'cheap and cheerful' sector. e. S. S. S. S. S. S. S. S. S. S. to 100 by an increase in the proportion of the stronger detergent (SLS) in the mix on the basis that greasy hair will require a shampoo with more powerful soil-removal properties.
4 Preservatives As with perfumes, this subject merits a book in its own right. The main concerns, as with all products destined for use on the human body, are resistance to spoilage and protection of the consumer. In the ca se of shampoos, it is particularly important to ensure that the product contains no pathogenic organisms, especially those capable of damaging the eyes. A variety of preservatives are available to the formulator and all of those in the following list have been commercially used in shampoos, either alone or in various combinations.
2 Lanolin derivatives Lanolin or wool wax obtained from sheep wool is a mixture of different esters from higher alcohols, mainly cholesterol, with higher fatty acids. The alcohol fraction contains linear and iso-C 16 _ 30-alcohols, while the fatty acids are mainly linear and hydroxy fatty acids with carbon-chain lengths between 10 and 29. Lanolin can bind 200- 300% of water in the form of a W/0 emulsion. Since lanolin can cause allergies, lanolin alcohols extracted after saponification of the wool wax are now mainly used.