Extrusion process for recovery of polymers from their dispersion

Details Extrusion process for recovery of polymers from their dispersion Extrusion process for recovery of polymers from their dispersion

1977-09-12

1979-01-23

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

159 2E, 366 85, 260816R, 260821, 264 86, 264349, 528494, 528502, C08F 622, C08F 624

Patent

active

041362519

ABSTRACT:
Polymers are isolated from their dispersions in liquid media in a twin-screw extruder, wherein the screws in the feed area are intermeshing and fully wiping each other and the extruder bore, the polymer dispersion or latex (which is coagulated in the first zone) being conveyed to a high pressure seal zone, liquid being forced upstream and out of the extruder, and the polymer being conveyed through the seal, into a reduced pressure zone, where most remaining liquid is removed, and finally into a pumping zone from which it is extruded. The invention avoids high pressure pumping of polymer dispersions and also is applicable to dispersions of sticky thermoplastic or elastomeric materials, which have caused considerable difficulties in the past.

REFERENCES:
patent: 3035306 (1962-05-01), Rossiter
patent: 3160620 (1964-12-01), Petersen
patent: 3742093 (1973-06-01), Skidmore
patent: 3917507 (1975-11-01), Skidmore
patent: 3981854 (1976-09-01), Kelly
patent: 3993292 (1976-11-01), Skidmore

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