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US 4,578,455 AGranted
Process and apparatus for removing volatile constituents from polymer melts or pastes
AssigneeBASF SE
InventorsGunter Pipper, Siegfried Riegger, Josef G. Floss
Life of this patent
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Abstract
A process for removing volatile constituents from polymer melts or pastes, wherein the polymer or paste containing the volatile constituents is passed, with continuous formation of fresh surfaces, through one or more zones in which the volatile constituents evaporate, and the volatile constituents are removed from the zone or zones in which they evaporate through, in each case, a plurality of porous orifices, and an apparatus for carrying out said process.
Claims1
A process for removing volatile constituents from a polymer melt in a vented extruder, which comprises
- (a) passing the polymer melt containing the volatile constituents through one or more zones, with continuous formation of fresh surfaces,
- (b) evaporating volatile constituents from this polymer melt in one or more such zones, and
- (c) removing the vapors of volatile constituents, thus produced, from the zone or zones via a porous plate having a porosity of from 25 to 60% and a pore diameter of from 5 to 200 .mu.m.
Dependencies are inferred from the claim text.