Huels Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Huls Aktiengesellschaft

Burkhard Boeke

Josef Kalka

Wolfgang A Kruse

Hermann Winter

Manfred Smolinski

Heinz Baukholt

Paste-forming polymers of vinyl chloride are produced by discontinuous polymerization in the presence of a conventional predispersion of emulsifier, dispersion acid, water and optional monomer-soluble catalyst. The predispersion is prepared only with 30-80% by weight of the amount of emulsifier required in total. The remainder of the emulsifier, or a component forming the emulsifier, is added in metered amounts as an aqueous solution batchwise or continously to the polymerization mixture after a conversion of 10-60% by weight. The thus-obtained polymers lead to pastes of an especially low viscosity, even under high shear stress, and result in open-cell plasticized foam materials having a good elastic memory capacity.

Process for the production of paste-forming vinyl chloride polymers

Paste-forming vinyl chloride polymers are prepared using an emulsifier system of:

Preparation of paste forming vinyl chloride polymers with high pressure

A process for the production of paste-forming polymers of vinyl chloride by emulsion or microsuspension polymerization, utilizes as the auxiliary dispersant an alcohol glycol ether of the general formula ##STR1## wherein R is an alkyl- or alkylene residue of 16-30 carbon atoms, R.sub.1 is H or an alkyl residue of 1-2 carbon atoms, and n is a number from 1 to 3. It is also possible to employ the predispersion method. The polymers yield pastes of low viscosity and an almost Newtonian fluid characteristic, and final products exhibiting a high resistance to fogging.

Paste-forming polymers of vinyl chloride are produced by discontinuous emulsion polymerization, adding to the polymerization charge, in a batchwise or continuous fashion, an emulsifier system comprising

Process for the production of paste-forming polymers of vinyl chloride

In a process for the thermal after-treatment of paste-forming homo- or copolymers of vinyl chloride, obtained by aqueous emulsion polymerization, followed by spray-drying to produce a spray-dried powder, an improvement is provided wherein 20 to 60 percent by weight of the spray-dried powder is warmed for 1 second to 30 minutes to a treating temperature of 75.degree.-110.degree. C., and then is recombined with the non heat-treated, 80-40 percent by weight portion of the powder.

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Burkhard Boeke