Chemische Werke Huls Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Paul Sunder-Plassmann

Gilbert Sielfeld

Vinyl chloride is polymerized in suspension using as the suspension stabilizer a copolymer of 65-85 molar percent of 2-isopropyl-.DELTA..sup.2 -oxazoline and 35-15 molar percent of 2-methyl-.DELTA..sup.2 -oxazoline, having a viscosity number of 35-80 ml/g, measured at 25.degree. C. in an isopropanol/water mixture (50 volume percent of isopropanol) in a concentration of 0.5% (weight/volume of solution).

Process for the production of polymers and copolymers of vinyl chloride

In a process for preparing a vinyl chloride resin by polymerizing vinyl chloride alone or with up to 20% by weight of other polymerizable unsaturated monomers, in an aqueous suspension, in the presence of a monomer-soluble free radical catalyst and a suspension stabilizer which is partially hydrolyzed polyvinyl acetate or cellulose ether, there is an improvement wherein the polymerization is conducted in the presence of 0.02-0.3% by weight, based on the amount of monomer to be polymerized, of a cosuspension stabilizer which is a copolymer of 2-n-propyl-.DELTA..sup.2 -oxazoline, 2-isopropyl-.DELTA..sup.2 -oxazoline or both and 2-methyl-.DELTA..sup.2 oxazoline, 2-ethyl-.DELTA..sup.2 -oxazoline or both, the copolymer having a viscosity number of 35-70 (ml/g), measured at 25.degree. C. in an isopropanol/water mixture (50 vol-% of isopropanol), in a concentration of 0.5% (weight/volume of the solution).

Process for the production of vinyl chloride polymers

A process for producing linear or slightly branched 2-(C.sub.1 to C.sub.3 -alkyl)-.DELTA..sup.2 -oxazoline copolymers from more than 50 mole % of 2-(isopropyl- and/or n-propyl)-.DELTA..sup.2 -oxazoline and less than 50 mole % of 2-(methyl- and/or ethyl)-.DELTA..sup.2 -oxazoline, the copolymers having a viscosity number in the range of 35 to 70 ml/g which is easily reproducible from batch to batch, comprises polymerizing the corresponding monomers in the presence of a cation-active catalyst having an anion of slightly nucleophilic nature, wherein,

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Paul Sunder-Plassmann