Montecatini Edison S.p.a.

Montedison Fibre S.p.a.

Febo Severini

Alberto Pagliari

Carlo Tavazzani

Alberto Valvassori

Piero Delle Ville

Crude graft products of styrene on polyolefinic rubbers in which, in the gel, the polystyrene/polyolefinic rubber ratio is shifted to relatively high polystyrene contents, always higher than 1:1, and which graft products are characterized by a satisfactory, which is to say commercially acceptable, distribution of the rubber particles in the polystyrene matrix are obtained by subjecting a solution of a polyolefinic rubber or elastomer in styrene to polymerizing conditions in aqueous phase in the presence of a radical initiator and of a chain transfer agent.

Impact resistant polystyrene and a process for its production

Impact resistant compositions comprising crude graft polymers of vinyl chloride on unsaturated olefinic elastomers, said elastomers being copolymers of ethylene, an .alpha.-olefin and a diene or a polyene, are prepared by graft polymerizing vinyl chloride onto an olefinic elastomer. The graft polymerization is discontinued before 70% of the vinyl chloride has been polymerized.

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Milan, Italy

Febo Severini