Abstract: A process for the manufacture of vinyl chloride polymers by polymerization of the monomer or monomer mixture in a reactor in which the internal walls, and the other parts on which polymer deposits can form, have a covering which contains a representative compound such as depicted by the formula ##STR1## extensive suppression of polymer crusts is thereby obtained.

Abstract: A process is described for the preparation of mixtures for processing as plastisols or organosols, wherein at least one known plasticizer, at least one first vinyl chloride copolymer and at least one vinyl chloride homopolymer or a second vinyl chloride copolymer are mixed together, if appropriate with the addition of further known substances. The first copolymer is a specific vinyl chloride graft copolymer, of which 5 to 70% by weight are employed, relative to the total quantity of polymers present in the mixture. It contains 99.5 to 88% by weight of polymerized units of vinyl chloride, 0.1 to 11.9% by weight of polymerized units of vinyl acetate and 0.1 to 2.2% by weight of polymerized units of ethylene. The remaining polymer(s) employed is/are prepared in accordance with customary processes.Mixtures prepared in this manner produce plastisols or organosols which have a low viscosity and good stability on storage and which also enable uniform coatings to be obtained by applying a thin layer.

Abstract: The sinterable polyvinyl chloride molding composition described is composed of 99.8 to 97% by weight, relative to the molding composition, of a suspension graft copolymer which is, in turn, composed of 99.7 to 85% by weight of polymerized vinyl chloride units, 0.9 to 10.5% by weight of polymerized ethylene units and 0.09 to 10.5% by weight of polymerized vinyl acetate units, with the proviso that the total of the polymerized ethylene and vinyl acetate units is 0.3 to 15% by weight, relative to the graft copolymer, and also 0.01 to 0.5% by weight, relative to the molding composition, of at least one free alkylarylsulfonic acid having 3 to 16 C atoms in the alkyl chain or at least one alkylsulfonic acid having 8 to 16 C atoms, and also 0.005 to 0.5% by weight, relative to the molding composition, of at least one water-soluble wetting agent which is free from metal ions and contains 12 to about 80 C atoms and a quaternary N atom which forms a salt with a carboxylic or sulfonic acid group.

Abstract: The present invention provides a process for the manufacture of vinyl chloride polymers by polymerization of the monomer or monomer mixture in aqueous dispersion in the presence of radical-forming catalysts and optionally suspension stabilizers, emulsifiers and further polymerization auxiliaries, which comprises carrying out the polymerization in a reactor the inner walls of which and other parts where polymer deposits may form are coated partially or entirely with a coating containing determined compounds of the formula ##STR1## In accordance with this invention, a substantial suppression of polymer deposit formation is achieved especially in the case of vinyl chloride copolymers.

Abstract: There is provided a process for the manufacture of vinyl chloride homopolymers, copolymers or graft polymers by carrying out the polymerization in a reactor the inner parts and inserts of which are coated with a coating consisting of defined hydrazine derivatives and, preferably, a film-forming material as carrier substance.

Abstract: The present invention provides vinyl chloride polymers having a reduced content of residual monomer. They are obtained by treating with steam a product moist with water at a temperature of from 90.degree. to 125.degree. C under a pressure of from 400 to 1,600 mm Hg. The invention also provides an apparatus to carry out the steam treatment of the moist polymer. The treated polymers have a residual vinyl chloride content down to less than 0.001% by weight.