Process for preparing concentrated acrylonitrile polymer solutio

Details Process for preparing concentrated acrylonitrile polymer solutio Process for preparing concentrated acrylonitrile polymer solutio

1975-10-07

1977-06-07

Wong, Jr., Harry

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 308R, 260 308DS, C08K 507, C08K 536

Patent

active

040283020

ABSTRACT:
Clear, bubble-free acrylonitrile polymer solutions of high polymer concentration are rapidly prepared by feeding powdered acrylonitrile polymer to a cool zone of a twin-screw machine and injecting solvent to form a slurry at a temperature below 40.degree. C., advancing the cool slurry to a heated zone and converting the slurry into a concentrated solution at 110.degree. to 150.degree. C. while intermittently squeezing it in directions transverse to the axes of the screws, and discharging the hot solution continuously from the machine. A zone of reduced pressure is provided to remove gases trapped in the slurry. A twin-screw machine for carrying out the process is disclosed.

REFERENCES:
patent: 3010932 (1961-11-01), Stoveken
patent: 3635917 (1972-01-01), Roth et al.

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