Dsm N.v.

Guido P Beusen

Reinoldus J Borggreve

Ellen M De Brabander-Van De Berg

The invention relates to a process for the preparation of star-branched polymers by reaction in the melt of a polymer having at least one hetero atom in the chain with a compound having at least three functional groups. Suitable polymers are for instance polyamides, polyesters, polyurethanes, polyoxyalkyls, polyimines and copolymers of these. Functional groups are for instance amine, carboxyl, hydroxyl, isocyanate and imine groups. The process is very fast and requires no special purification. The process enables star-branched polymers to be prepared which are derived from so-called AABB polycondensates.

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Nuth, Netherlands

Guido P Beusen