Stabilized polymers and their production and stabilizers therefor.

摘要

A heat, light and oxidation stabilizer for polymers such as synthetic rubbers and resins comprises (a) at least one sulfur-containing compound of the general formula:
(R1-S-CH2CH2-@-O-CH2 &rparstr& @C
 (I)

wherein R1 represents an alkyl group having 4 to 20 carbon atoms and (b) at least one phenolic compound of the general formula:
<CHEM>
wherein the R2's are selected from alkyl groups having 1 to 4 carbon atoms, the weight ratio of (a) : (b) being from 1 : 0.1 to 1 : 2. The stabilizer ingredients may be added separately or together to the polymer or to monomer or prepolymer therefor. Preferred stabilizer ingredients are (a) pentaerythritol-tetrakis( beta -dodecyl thiopropionate) and/or (b) 2-(2-hydroxy-3-t-butyl-5-methylbenzyl)-4-methyl-6-t-butylphenyl acrylate.