Water assisted devolatilization

Degagement des matieres volatiles au moyen d'eau

Abstract

A polymer melt may be devolatilized to less than 500, preferably less than 150 ppm of residual volatile material by injecting into the melt an amount of water greater than the amount of residual volatile material in the melt, typically not more than about 10 weight % and passing the melt through a flash chamber devolatilizer at a pressure of 8 mm of Hg or less at a temperature of from 200 to 350°C.

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