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Preparation of solution of high molecular weight polymers
| Details |
Inventors: Kavesh, Sheldon;
Assignee: Allied-Signal Inc. (Morris Township, Morris County, NJ)
Primary Examiner: Silbaugh; Jan H.
Assistant Examiner: Lorin; Hubert C.
Attorney, Agent or Firm: Anderson; Richard A.
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. |
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DETAILED DESCRIPTION I claim: 1.
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.
2.
The method of claim 1 wherein said polymer is an ultrahigh molecular weight polyolefin.
3.
The method of claim 2 where said olefin is polyethylene having a molecular weight of from between about 300,000 to about 7,000,000.
4.
The method of claim 1 wherein the polymer is selected from the group consisting of polyolefins, polyvinyl alcohol, polyacrylonitrile and nylon-6.
5.
The method of claim 1 wherein the temperature in said screw extruder is between about 150.
degree.
C.
and 300.
degree.
C.
6.
The method of claim 1 wherein the residence time in said screw extruder is between about 3 minutes and about 1 hour.
7.
The method of claim 1 wherein said positive displacement pump is a piston pump.
8.
The method of claim 7 wherein the pressure at the discharge of said positive displacement pump is between about 50 and 1500 psig (0.
34 to 10.
3 mega pascals).
9.
The method of claim 1 wherein the pressure at the discharge of said metering pump is between about 100 and 2000 psig (0.
7 to 13.
8 mega pascals).
Description:
BACKGROUND OF THE INVENTION Several processes for the solution spinning of high molecular weight polymers have been described in the prior art.
The solution spinning of high molecular weight polyethylene for example, has been described in U.
S.
Pat.
Nos.
4,551,296; 4,344,908 and 4,430,383, all of which are hereby incorporated by reference
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