Nobel Hoechst Chimie

Erich Schaffer

Jean Cabestany

A process of production of linear, water-soluble polymers and co-polymers of very high molecular weight in powder form, from monomers which are themselves soluble in water comprises operating in emulsion with an inversion of phase during the course of the operation with, as solvent, a hydrocarbon giving with water an azeotrope boiling at a temperature lower than 100.degree.C, and with, as emulsifying agent, a non-ionic emulsifying agent having a H.L.B between 8 and 13 in a proportion of 1.5 to 5 % of the total weight of the monomers and the solvents, initiating the polymerization at a temperature lower than 35.degree.C by adding the quantity of initiator of the Redox type to the whole of the reactants and especially carrying out the polymerization in a closed vessel without external cooling, until the maximum temperature is reached.

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Oise, France

Erich Schaffer