Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1990-01-22
1991-10-15
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
560152, C08K 536
Patent
active
050575678
ABSTRACT:
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 esters 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.
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Smith et a., "Addition of Thioglycolic Acid to Alpha-Alkenes", Acta Chemica Scandinavca8, vol. 8, No. 7, 1954.
Fisch Michael H.
Peveler Richard D.
Hoke Veronica P.
Witco Corporation
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