Hoechst Aktiengesellschaft

Gunter Mayer

Helmut Strametz

Eberhard Fischer

Disclosed is a process for the continuous production of rosins which have consistent, uniform properties and are suitable for use as printing ink resins, the process comprising reacting the reaction mixture in a continuously operated reaction vessel cascade comprising at least two reactors.

Process for the continuous preparation of rosins

During the recovery of the unreacted propylene from the mother liquor obtained in the polymerization of liquid propylene, the major part of the propylene is evaporated in a first evaporation step at a low temperature and the remaining part is evaporated in a second evaporator at a high temperature. In this way an early agglomerization of the atactic and/or low-molecular weight polymer dissolved in the mother liquor and fouling of the heat exchanger tubes and/or of the column trays is avoided.

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Koenigstein, Germany

Gunter Mayer