Societa' Italiana Resine S.i.r. S.p.a.

Antonio Quarta

Luciano Console

Alessandro Zecchin

A process for polymerizing acrylonitrile monomer or copolymerizing a mixture of acrylonitrile monomer and further ethylenically unsaturated monomers copolymerizable therewith, which comprises contacting the monomer or mixture of monomers in an aqueous medium at a temperature not exceeding 55.degree.C with a catalytic system comprising a watersoluble persulphate, a hydroxylamine mono- or disulfonate and a water-soluble salt of a variable valence metal, such as a ferrous salt.

Catalytic process for the preparation of polyacrylonitrile and

A method of polymerizing acrylonitrile monomer or copolymerizing a mixture of acrylonitrile monomer and further ethylenically unsaturated monomer copolymerizable therewith which comprises contacting in an aqueous medium the monomer of mixture of monomers with a catalytic system comprising hydrogen perioxide, a water-soluble salt of a hydroxylamine mono- or disulfonic acid and a water-soluble salt of a variable valence metal, such as a ferrous salt.

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Porto Torres (Sassari), Italy

Antonio Quarta