Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

Kurt Stinsky

Bernard Gilg

The present invention relates to synergistic mixtures of at least one 2,4-dimethyl-6-s-alkyl phenol and at least one selected sterically hindered phenol according to formula II ##STR1## The variable 'n' is 1, 2 or 4. X.sub.1 is tert-butyl. X.sub.2 is C.sub.1 -C.sub.4 alkyl. X.sub.3, when n is 1, is C.sub.1 -C.sub.20 alkyl, a triazinylamino group, or a --A.sub.1 --COO--A.sub.2 or --A.sub.1 --CONH--A.sub.2 group. X.sub.3, when n is 2, is a --E.sub.1 --COO--E.sub.2 --OOC--E.sub.3 -- or --E.sub.1 --CONH--E.sub.2 --NHCO--E.sub.3 -- group. X.sub.3, when n is 4, is �--G.sub.1 --COO!.sub.4 --G.sub.2. The instant synergistic mixtures can be used to stabilize selected organic polymers against thermal, oxidative and/or actinic degradation.

Synergistic mixture consisting of a 2,4-dimethyl-6-S-alkylphenol and a

A process for producing an emulsion graft copolymer, which comprises grafting a vinyl aromatic monomer and a comonomer onto a rubber latex in the presence of an iron (II) redox system as polymerization catalyst and coagulating the graft copolymer latex with an alkaline earth metal compound, characterized in that the pH of the coagulated slurry is adjusted to a value ranging from 8 to 12

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Basel, Switzerland

Kurt Stinsky