화학종명(한) |
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에스테르류 (Includes only esters not otherwise classified as alkoxylated carboxylic acids, glyceryl esters, isethionates, lanolin derivatives, phosphorus compounds, sulfosuccinates or sulfuric acid esters) |
설명(영) |
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Chemically, Esters are the covalent compounds formed between acids and Alcohols. Esters can be formed from almost all acids (inorganic and carboxylic) and any alcohol. Thus, the number of naturally occurring and synthetically prepared esters used in cosmetics is very large. In order to subdivide the list of esters, most have been assigned to other chemical classes on the basis of some additional chemical features: Alkoxylated Fatty Acids, Alkyl Ether Sulfates, Alkyl Sulfates, Fats and Oils, Glyceryl Esters, Phosphorus Compounds, Isethionates, Sorbitan Derivatives, Sulfosuccinates, Sulfuric Acid Derivatives, and Waxes.
Esters belonging to this specific class are derived from carboxylic acids and have the structure RCO-OR' where RCO- represents the carboxylic acid radical and where -OR' is the alcohol residue. Included are low and medium molecular weight compounds, e.g., Butyl Acetate or Isopropyl Myristate; some polymers, e.g., Polyvinyl Acetate. They are subject to hydrolysis into alcohols and acids at extreme pHs and at elevated temperatures.
Esters in this group find diverse uses in cosmetics as emollients and conditioners (Isopropyl Myristate), as solvents (Ethyl Acetate), as fragrance components (Methyl Salicylate), and as preservatives (Propylparaben). |