Hydrolysis-Resistant Esters

December 13, 2005 | By: John A. Imperante, Phoenix Chemical
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Title: Hydrolysis-Resistant Esters
estersx hydrolytic instability of estersx non-hydrolyzable estersx Saponification Valuex testingx
  • Article

Hydrolytic instability of esters causes problems when esters are used in cosmetic formulations. One way around these problems is to use certain non-hydrolyzable esters that are synthesized by a diol reaction sequence. This sequence, two examples of the resulting non-hydrolyzable esters and some formulations using them are presented in this article.

Esters are a class of compounds well known to the organic chemist and to the cosmetic chemist. There are a number of sub-classes of esters that differ both in functionality and structure.  These include simple fatty-fatty esters, complex esters, polyesters, Guerbet esters, and water-soluble esters. Each type provides specific functionality in cosmetic formulations. For example, fatty-fatty esters are generally oil soluble and useful in the oil phase of creams and lotions. Complex esters – such as trioctyldodecyl citrate, Guerbet esters and polymeric esters – serve as pigment wetting and dispersing agents and in makeup and lipstick for substantivity, transfer resistance and moisturization.