Hoechst Aktiengesellschaft

Horst Semmler

Alexander Ohorodnik

Karl Kaiser

Johannes Brandrup

Manfred Scholz

Werner Sommer

Hermann Vierling

Wolfram Busch

Robert Willms

Joachim Hardel

Hans W Keuper

The disclosure relates to a process for making fine particulate, non-agglomerating chloropolyethylene by subjecting pulverulent polyethylene to a chlorination reaction in aqueous or aqueous/hydrochloric acid-suspension with chlorine gas at a temperature of about 20.degree. to 140.degree. C. in the presence of silicic acid and silicon oil, separating, washing and drying the chloropolyethylene. More particularly, the disclosure provides for the chlorination to be terminated and for the aqueous hydrochloric acid-suspension of chloropolyethylene to be then intensively mixed with an aqueous or aqueous/hydrochloric acid-dispersion having talc as well as an orthophosphoric acid mono- and/or diester or a polysiloxane by means of an emulsifier dispersed in it, and for the chloropolyethylene to be separated from the mixture, to be washed and dried.

Process for making fine particulate non-agglomerating chloropolyethylene

Free-flowing chloropolyethylene in powder form which keeps this property after prolonged storage and has good processing properties is impregnated substantially on the particle surface with definite amounts of fine-grained vinyl chloride polymer and fine-grained organic substance in a definite proportion. The invention also relates to a process for the manufacture of such an improved chloropolyethylene and the use thereof.

Free flowing chloropolyethylene, its manufacture and use

Chlorinated polymers obtained by a filter-separation procedure, in a moist form, especially a water-containing moist form, are dried. To this end, the moist polymer is predried in a first fluidized-bed drying zone, this being continuously operated, and is thereafter further dried in one or more further fluidized-bed drying zones disposed downstream, of the said first drying zone.

Process for drying chlorinated polymers

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Bruhl, Germany

Horst Semmler