Method to prepare high strength ultrahigh molecular weight polyolefin articles by dissolving particles and shaping the solution
First Claim
1. A method to prepare high strength, high modulus polyolefin shaped articles comprisingforming a heated solution of said polyolefin from particles of which about 75 to about 100% by weight have a particle size of from about 100 to about 400 microns and having a weight average molecular weight of from about 300,000 to 7,000,000, the particle size being distributed in a substantially Gaussian curve of particle sizes centered at about 125 to 200 microns so that the polyolefin particles are completely dissolved and the solution obtained therefrom is substantially uniform in properties throughout,extruding said heated solution,cooling said extruded solution, andstretching said extruded solution.
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Abstract
A method to prepare high strength high modulus polyolefin shaped articles comprising forming a heated solution of the polyolefin from particles of which about 75 to 100% by weight have a particle size of from about 100 to about 400 microns and having a weight average molecular weight of from about 300,000 to 7,000,000, then shaping the heated soltion then cooling the shaped solution. To further increase the strength of the article it can be stretched.
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Citations
19 Claims
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1. A method to prepare high strength, high modulus polyolefin shaped articles comprising
forming a heated solution of said polyolefin from particles of which about 75 to about 100% by weight have a particle size of from about 100 to about 400 microns and having a weight average molecular weight of from about 300,000 to 7,000,000, the particle size being distributed in a substantially Gaussian curve of particle sizes centered at about 125 to 200 microns so that the polyolefin particles are completely dissolved and the solution obtained therefrom is substantially uniform in properties throughout, extruding said heated solution, cooling said extruded solution, and stretching said extruded solution.
Specification