Stamicarbon B.v.

Reinard J Steeman

Peter J Meyer

The invention relates to a process for the preparation of a thermoplastic polymer on the basis of an alkenyl aromatic monomer, an unsaturated dicarboxylic anhydride, and, optionally, a rubber, characterized in that the monomers and/or solution thereof are/is reacted in at least two reaction zones that are in open connection with each other at the top and at the bottom, the reaction mixture being circulated through the reaction zones by means of a mixing device and/or a conveying device. Using the process, a homogeneous product of constant composition is obtained.

Process for the preparation of a homogeneous thermoplastic polymer

A process for the preparation of a thermoplastic polymer on the basis of an alkenyl-aromatic monomer and an unsaturated dicarboxylic acid comprises the addition of 10 to 100 ppm relative to the polymer wt. % of an acid during polymerization. Suitable acids that can be applied are carboxylic acids, and sulphur- and /or phosphorus-containing acids or their mixtures.

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Elsloo, Netherlands

Reinard J Steeman