Montedison S.p.a.

Spartaco Fontani

Gianluigi Landoni

Osvaldo Cicchetti

Guido Bertelli

Renato Locatelli

Pierpaolo Roma

There is disclosed a solid and water-insoluble condensation product of N,N'-ethyleneurea with formaldehyde, having the structure ##STR1## wherein n is an integer from 20 to 60 with a mean value of 41, and having an average number molecular weight M.sub.n ranging from 2000 to 6000. Said product, when added to a polymer in combination with an ammonium phosphate, results in the production of articles which are resistant to heat and to thermo-oxidation.

Condensation product prepared from N,N'-ethylene-urea and formaldehyde

Thermoplastic polymers, such as polypropylene, are rendered anti-flaming and self-extinguishing by addition of ammonium or amine phosphate and a nitrogen-containing water-insoluble oligomer or polymer containing in the monomeric unit a --CO--group attached to a ##STR1## group, wherein n is 2 or 3, being part of a ring, e.g., poly(carbonylpiperazine).

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Milan, Italy

Spartaco Fontani