×

Extrusion method forming an enhanced property metal polymer composite

  • US 7,491,356 B2
  • Filed: 11/12/2004
  • Issued: 02/17/2009
  • Est. Priority Date: 11/14/2003
  • Status: Active Grant
First Claim
Patent Images

1. A method to extrude a metal polymer composite, the composite comprising a metal particulate phase and a polymer phase, the method comprising:

  • (a) combining;

    (i) about 96 to 45 volume-% of a metal particulate comprising 5 wt-% or less of particles having a particle size of less than 10 microns, the metal having a density greater than 8 gm-cm

    3
    , in a particulate phase having a particle size distribution having at least 10 wt.-% of particulate within of about 10 to 70 microns, at least 20 wt.-% of the polymer particulate within about 70 to 500 microns, a circularity greater than 13 and an aspect ratio less than 3;

    (ii) about 4 to 53 volume-% of a polymer phase; and

    (iii) about 0.005 to 3 wt.-% of an interfacial modifier material to form a composite mix; and

    (b) extruding the composite mixture at a temperature greater than 100°

    C. and at a shear rate of about 1 to 500 sec

    1
    to form an extruded metal polymer composite;

    wherein the extruded composite has a density greater than about 7 gm-cm

    3
    and a storage modulus of greater than 300 MPa.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×