Hoechst Aktiengesellschaft

Hoechst Aktiengelselschaft

Dieter Ulmschneider

Klaus Hintzer

Werner Schwertfeger

Friedrich Engelhardt

Martin Hille

Peter Wegener

Peter Blickle

Heinz Klippert

Wilhelm Riemenschneider

A trifluoroacrylate has been prepared by reacting hexafluoropropene with halogen fluorosulfate (halogen X:Cl, Br or I), eliminating the fluorosulfate CF.sub.3 --CFX--CF.sub.2 --OSO.sub.2 F to give the acid fluoride CF.sub.3 --CFX--COF, esterifying the acid fluoride and dehalogenating the product using a metal component.

Process for the preparation of trifluoroacrylates

The invention relates to a process for the production of chloroalkylsulfonyl isocyanates of the formula ##STR1## by a catalytically induced reaction of chlorosulfonyl isocyanate with one or more C.sub.2 -C.sub.4 -olefins. The reaction is carried out in a continuous manner in a tubular reactor.

Continuous process for the production of chloroalkyl-sulfonyl isocyanates

A process for the polymerization of vinyl chloride in an aqueous phase in the presence of oil-soluble free-radical initiators and a mixture of at least two high-molecular, surface-active suspending agents is described. This mixture is composed of 10 to 90% by weight (relative to the mixture) of at least one copolymer formed from vinyl acetate and a compound of the formula

Process for the polymerization of vinyl chloride in an aqueous phase

An aqueous clay base mud for deep drilling containing as a protective colloid a copolymer which is constituted by the formula I, II and III ##STR1## IN WHICH R.sub.1 and R.sub.2 each is hydrogen of --CH.sub.3 ; R.sub.3 is --CO--NH.sub.2, --CN or COOCH.sub.3 ; R.sub.4 is hydrogen, --CH.sub.3 or --C.sub.2 H.sub.5 ; R.sub.5 is --CH.sub.3 or --C.sub.2 H.sub.5 or R.sub.4 and R.sub.5 together represent a propylene group forming a pyrrolidone radical with the inclusion of the radical ##STR2## Me is ammonium, potassium, sodium or lithium and x is 5 to 50, y 25 to 92 and z 3 to 70, Or by the saponification products thereof and which contains the components in the parts by weight of the starting monomers indicated by the indices x, y and z.

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Konigstein, Germany

Dieter Ulmschneider