Mixed s-alkylthiopropionic acid esters with pentaerythritol and the like.

摘要

Mixed esters of pentaerythritol and the like with at least two different 3-alkylthiopropionic acids are provided. Each acid from which the ester is prepared has a different alkyl group. This facilitates tailoring the mixed ester for use as a stabilizer which is especially compatible with a particular polymer resin material. Preferably, each 3-alkylthiopropionic acid is prepared by a direct addition reaction between an alkylmercaptan and acrylic acid or an alkali metal salt thereof, the reaction being carried out by heating the reactants in the presence of an aqueous alkaline solution.