Abstract: Stable, aqueous dispersions of copolymers based on conjugated, aliphatic dienes and vinyl aromatic compounds are prepared by carrying out the emulsion polymerisation in the presence of water and emulsifiers and in the presence of water-soluble initiators, with 15 to 85 wt. % of the total of the emulsifiers used being added within the time in which up to 40% of the overall conversion of the components used is attained, and with 1 to 50% of the carboxylic acid groups contained in the additionally used ethylenically unsaturated carboxylic acids being neutralized by the addition of bases during the emulsion polymerisation.

Abstract: The new thionyl phosphazene polymers, which contain recurring structural units corresponding to the following formula ##STR1## are prepared by ring-opening polymerization of cyclothionyl chlorophosphazene corresponding to the following formula ##STR2## at temperatures of 100.degree. to 300.degree. C. in the presence of an inert organic solvent and reaction of the polymer thus obtained, which corresponds to the following formula ##STR3## with salts corresponding to the following formulaM(R.sup.1 -R.sup.5)in the presence of an inert organic solvent at temperatures of 20.degree. to 200.degree. C.The new thionyl phosphazene polymers may be used for the production of thermoplastics, elastomers or thermosets.