Montedison S.p.a.

Gian F Lunardon

Eugenio Bianchin

Giovanni Longo

Modified polyisocyanates with biuret structure containing terminal urethane groups and having general formula: ##STR1## in which R.sub.1 is an aliphatic, cycloaliphatic or aliphatic-cycloaliphatic radical, simple or substituted, and R.sub.2 can have the same meanings as R.sub.1 or can be the radical R.sub.3 (OC.sub.n H.sub.2n).sub.x --. Process for the preparation of modified polyisocyanates having biuret structure containing terminal urethane groups having general formula (I) consisting in reacting an organic diisocyanate with water or with a compound which splits off water, in the presence of a compatibilizing agent having a hydrogen atom reactive towards the isocyanate group, as it can be determined by Zerewitinoff's method.

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Paduva, Italy

Gian F Lunardon