The British Petroleum Company, P.l.c.

Bp Chemicals International Limited

Anthony John Park

Alan Charles Sturt

Brian Weeks

Richard Harvey Williams

A vinyl halide paste polymer of low viscosity may be produced by adding a sulphosuccinate emulsifier to the polymer latex after microsuspension polymerisation but before isolation. This gives a polymer which can be made into a paste in known fashion.

Polymers modified by sulfosuccinae esters

Residual vinyl halide is removed from vinyl halide polymer by radiofrequency dielectric heating while maintaining the presence of water in the polymer by impeding evaporation of water from the polymer.

Removal of residual monomer in the presence of water by dielectric

Vinyl halide monomer content of vinyl halide polymer is reduced by subjecting the polymer to radio frequency dielectric heating in the presence of added polymerization initiator.

Treatment of vinyl halide polymers

The residual vinyl halide content of vinyl halide polymer is reduced by radiofrequency dielectric heating of a water-containing layer of particulate polymer over which is disposed a layer of material through which vinyl chloride can pass but which restricts the passage of water e.g. perforated plastic sheet.

Removal of residual vinyl halide monomer from vinyl halide polymers by

A vinyl halide paste polymer of low viscosity may be produced by adding an alkaryl sulphonate emulsifier to the polymer latex after polymerisation but before isolation. This gives a polymer which can be made into a paste in known fashion.

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South Croydon, United Kingdom

Anthony John Park