Societe Nationale Des Poudres Et Explosifs

Jean-Pierre L Cartier

Jean-Pierre G Senet

Louis J Leneveu

Didier J Treneules

Bernard W Wiedemann

Jean-Marc Peyrard

The present invention relates to continuous triturators and malaxators having a horizontal drive shaft. The apparatus preferably comprises a semi-circular chute surmounted by parallelepipedal vertical walls, and a stirrer consisting of a shaft which is concentric with the chute and carries rigid blades perpendicular to this shaft, at least one in four of the said blades being extended by a tongue which rubs against the chute, and the materials constituting the various elements which can come into contact with the grains of propellant powder being conductors of electricity. Apparatus which makes it possible to carry out continuous surface treatments of granular propellant powders.

Apparatus and process for continuous surface treatments of propellant

The free and bonded residual phenol content of oligocarbonates prepared by transesterification between a diol and a diphenyl carbonate is substantially reduced by a process comprising (i) introducing water into the oligocarbonate in the liquid state at an elevated temperature under reduced pressure and (ii) purging the mixture with an inert gas to effect degassing. The purified oligocarbonates are particularly resistant to yellowing.

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Evry, France

Jean-Pierre L Cartier