Thioether antioxidant

Similar to phosphorous, sulfur-based antioxidants are active hydroperoxide decomposers, so they are used in large quantities as secondary antioxidants, especially for rubber-like polymersThey do not react with radicals and thus will only improve the polymers’ color stability rather than the melt flow index.

Commodity sulfur-based AOs are all derived from esters of 3,3′-thiodipropionic acids, e.g. dilauryl thiodipropionate (DLTDP). DLTDP turns into an oxidized form followed by reverse Michael reactions to release sulfuric acid, which is also able to reduce hydroperoxides. Linanox 412s is also a derivative of 3,3′-thiodipropionic acids and is suitable for high-temperature applications thanks to its high molecular weight structure.

Common thioether antioxidants include Linanox DLTDP, DSTDP and 412s.

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