Bayer Aktiengesellschaft

Rainer Fritz

Manfred Beck

Alfred Pischtschan

Karl Zabrocki

Gunter Marwede

Dieter Theisen

Copolymers of from 65 to 75%, by weight, of .alpha.-methyl styrene and from 35 to 25%, by weight, of .alpha.-methyl styrene and from 35 to 25%, by weight, of acrylonitrile, obtainable by radical emulsion polymerization, the monomers being metered in during the course of the polymerization, wherein the molar ratio: ##EQU1## of the unreacted monomers in the reaction mixture is maintained during the metering phase between 0.7 and 1.25.

Copolymers of alpha-methyl styrene and acrylonitrile

Polysegment copolymers with thermoelastomeric properties are obtained by a process, wherein block polymers of the idealised form S.sub.x -B.sub.y, in which S represents structural units derived from styrene, B represents structural units derived from a conjugated diene and x and y are integers, are reacted with sulphur chlorides. The products according to the invention are suitable for the production of shoe soles, hoses, industrial rubber articles and particularly hot melt adhesives.

Polysegment copolymers

A process for the ring-opening polymerisation of cyclic olefins on catalysts of

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Cologne, Germany

Rainer Fritz