Chemische Werke Huels Aktiengesellschaft

Huels Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Gilbert Sielfeld

Paul Sunder-Plassmann

Rudolf De Jong

A process for the production of polymers of vinyl chloride by suspension polymerization, uses as the suspension stabilizer either

Process for the polymerization of polymers of vinyl chloride

A process for producing vinyl chloride polymers and copolymers by suspension polymerization is carried out in the presence of small amounts of ethylene/vinyl acetate copolymers with a vinyl acetate content of 38% by weight to 55% by weight and with a viscosity number of 95-210 ml/g, the catalyst being added to the polymerization charge in dissolved form. The resultant polymers are suitable for lowering the viscosity of polyvinyl chloride plastisols.

Polymerization of vinyl chloride in the presence of a catalyst

Vinyl chloride polymers and copolymers are produced by suspension polymerization in the presence of a small amount of specific ethylene-vinyl acetate copolymers. The catalysts, the ethylene-vinyl acetate copolymer, and the monomer or monomer mixture are added to the polymerization charge before the suspension agent. The resultant polyvinyl chloride is especially suitable for lowering the viscosity of polyvinyl chloride plastisols.

Suspension polymerization of vinyl chloride wherein suspension agent is

Production of suspension polyvinyl chloride suitable for reducing the viscosity of polyvinyl chloride plastisols is effected by suspension polymerization in the presence of small amounts of

Process for the production of polymers and copolymers of vinyl chloride

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).

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).

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Marl, Germany

Gilbert Sielfeld