Preparation of solution of high molecular weight polymers
AssigneeAllied-Signal Inc.
InventorSheldon Kavesh
Life of this patent
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Abstract
Solutions of high molecular weight polymers, such as ultrahigh molecular weight polyolefins are prepared, by forming a slurry of particles of the polymer in a solvent for the polymer, then transferring the slurry to a pumping device, then pumping the slurry under pressure to insure positive displacement to a screw extruder, and maintaining the slurry in the screw extruder for sufficient residence time at sufficient temperature so that a homogeneous solution is formed, then conveying the solution with the screw extruder to metering device which can feed a spinnerette, or a film-forming or tape-forming slit extruder.
Claims9
A method to prepare homogeneous solutions for extrusion of high molecular weight polymer comprising
- forming a slurry of particles of the high molecular weight polymer in a solvent for the polymer, then
- transferring said slurry to a positive displacement pump, then
- pumping said slurry with said positive displacement pump under sufficient pressure to insure positive conveyance to a screw extruder, then
- maintaining said slurry in said screw extruder for sufficient residence time and at a sufficient temperature so that a homogeneous solution of the polymer is formed, then
- conveying said solution with a metering pump to an extruding device.
Dependencies are inferred from the claim text.