Bayer Aktiengesellschaft

Karl-Erwin Schnalke

Carlhans Suling

Joachim Konig

Fritz Doring

Josef Heinrich

Frank Doscher

Horacek: Gotz

A novel process for the preparation of benzodioxoles of the formula (I) ##STR1## in which Hal represents a chlorine atom or a fluorine atom, from dichlorobenzodioxole using stoichiometric quantities of anhydrous hydrofluoric acid.

Process for the preparation of difluorobenzodioxole and

A process for chlorinating a compound of the formula ##STR1## in which R.sup.1 is a C.sub.1 -alkyl radical, C.sub.1 -alkoxy radical or C.sub.1 -thioalkyl radical, and

Preparation of substituted benzotrichlorides

The invention relates to a process for the continuous production of a chemically uniform copolymer comprising 15 to 50% by weight of acrylonitrile and from 85 to 50% by weight of vinyl chloride and, optionally, up to 4% by weight of at least one other copolymerized ethylenically unsaturated comonomer containing acid groups by emulsion polymerization, wherein the copolymerization reaction is carried out with a monomer ratio of acrylonitrile to vinyl chloride of from 0.02 to 0.5, in the presence of a redox catalyst and in an acidic medium.

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Leverkusen, Germany

Karl-Erwin Schnalke