Basic stabilisation systems for emulsion polymerised rubber

摘要

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).;

主权项

1. A composition comprising
(a) an emulsion crude nitrile butadiene rubber, (b) a compound of formula I wherein R1 is C8 or C12 alkyl, R2 is CH3, R3 is CH2—S—R1, and R4 is hydrogen (c) a styrenated diphenylamine of formula II wherein (b) is present from 0.133 to 0.267% by weight and (c) is present from 0.133 to 0.267% by weight based on the weight of the dry solids content of (a) and wherein the emulsion has been coagulated with a halogen containing system comprising calcium chloride.