Chemistry and Technology of the Cosmetics and Toiletries by E. Spiess (auth.), D. F. Williams, W. H. Schmitt (eds.)

By E. Spiess (auth.), D. F. Williams, W. H. Schmitt (eds.)

Organized on a product classification foundation, this quantity offers an up to date evaluate of the cosmetics and toiletries in a with ease digestible shape. Authors speak about the explanation of uncooked fabrics choice, the formula and improvement of goods that meet the calls for of a world marketplace position, product performances, and defense and caliber aspects.

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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. Another useful comparison that can be made between these surfactants is the effect of changing the cation.

Large-scale processing equipment is very expensive; HAIR-CARE PRODUCTS 33 careful formulation can help to optimise the use of tank space and tank time. 2 "air: structure and chemistry Hair consists of three main layers: li) the central core or medulla, which is not always present and whose function is not entirely clear; (ii) the cortex, which contributes the bulk of the hair shaft and consists of elongated keratinised cells, the whole structure having a fibrous nature. Each fibre is in turn made up of bundles of small fibres until, at molecular level, polypeptide chains are found to be twisted together to form a helix, an arrangement often favoured by nature; (iii) the cuticle, in the form of thin overlapping scales that cover the cortex like tiles on a roof.

The properties of the different detergents have been reviewed in great detail elsewhere [14- 21]. Here, therefore, only specific comments about the most commonly used materials will be made. In the case of sodium lauryl ether sulphate (CTF A dictionary name sodium laureth sulphate) the general formula is R- (OCH2CH2). - OS03Na + where R is the alkyl chain ofvariable length, predominantly C I2 (Iauryl) and the average degree of ethoxylation n is equal to 2 or 3. The various methods of preparation for this surfactant are referred to in chapter land, depending on feedstock and the method used, many variations are possible.

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