| 摘要 |
A polymer melt may be devolatilized to less than 500, preferably less than 1.50 ppm of residual volatile material by injecting into the melt an amount of fluid which will condense but not freeze at pressures of less than about 20 yarn Hg, in an amount greater than the amount of residual volatile materi al in the polymer melt, typically not more than about 10 weight % and passing t he melt through a zone of pressure of 8 mm of Hg or less at a temperature of fr om 200 to 350.degree.C.
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