Stamicarbon B.v.

Peter J Meyer

Josef M Penders

Reinard J Steeman

Johannes G Nieuwkamp

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.

Process for the preparation of a thermoplastic polymer

The invention relates to a process for the preparation of a N-alkyl-2-pyrrolidone by reducing the corresponding N-(.alpha.-hydroxyalkyl)-2-pyrrolidone in the liquid phase under an atmosphere of hydrogen gas and in the presence of a noble metal hydrogenation catalyst while in the absence of trifluoroacetic acid.

Method for the preparation of N-methyl and -N-ethyl-1-pyrrolidones

An improved method for hydrogenating succinonitrile, optionally carrying substituents, to form 2-pyrrolidones, in the liquid phase in the presence of ammonia, using a fixed-bed catalyst wherein the catalyst may be regenerated by successively passing liquid ammonia at 75.degree.-130.degree. C., then hydrogen at 130.degree.-350.degree. C., and then liquid ammonia again at 75.degree.-130.degree. C. over the catalyst.

Process for the preparation of a 2-pyrrolidone

A process is described for the preparation of delta keto-acids wherein there is used as a catalyst the condensation adduct of a cyclic secondary amine with an .alpha.-.beta.-acrylic-type unsaturated compound, providing high selectivity and conversion results.

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Munstergeleen, Netherlands

Peter J Meyer