There are described compositions comprising a) an emulsion crude rubber, synthetic latex or natural rubber latex subject to oxidative, thermal, dynamic and/or light-induced degradation, b) a compound of the formula (I) wherein R1 is C8-C12alkyl, R2 is hydrogen, C1-C12alkyl, cyclohexyl, 1-methylcyclohexyl, benzyl, α-methylbenzyl, α,α-dimethylbenzyl or —CH2—S—R1, R3 is C1-C12alkyl, benzyl, α-methylbenzyl, α,α-dimethylbenzyl or —CH2—S—R1, R4 is hydrogen or methyl, and c) a styrenated diphenylamine of the formula (II).