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

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

Organized on a product type foundation, this quantity offers an up to date evaluate of the cosmetics and toiletries in a easily digestible shape. Authors talk about the reason of uncooked fabrics choice, the formula and improvement of goods that meet the calls for of a world marketplace position, product performances, and security and caliber aspects.

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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. 3. Triethanolamine lauryl sulphate (TLS) is notable for being particularly difficult to thicken and having poor colour stability. Diethanolamine lauryl sulphate, once widely used in the US is rapidly declining in use as a result of fears concerning nitrosamine formation from diethanolamine.

4), performing quite weil over a wide pH range. Cost eonsiderations usually dietate that speeiality surfaetants assume a seeondary role. 5 gives some formulations illustrating typieal use levels of some of these materials. Along with the betaines, most speeiality surfaetants will improve the quality of the lather, the mildness (as measured by skin and eye irritation), and, most important, the afterfeel of the hair [26- 29]. A partieularly interesting amphoterie is sodium earboxymethyl tallow polypropylamine-4, for whieh a considerable amount of data relating to its very low eye irritation has been amassed [30,31].

1 Structure oJ hair keratin Keratin is a protein, a copolymer of a variety of amino acids, about 25 types in all. Keratin differs from most other proteins in that quite a high proportion (around 20%) of the amino acid units contain sulphur, notably in the form of the disulphide bond present in cystine. The basic amino acid unit may be represented as /COOH R- CH ~NH2 where R can either be a simple aliphatic group, or may be more complex, containing benze ne rings, double bonds, heterocyclic rings, fused rings or additional carboxylic acid or amino groups.

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