Magnetic substrates with high magnetic loading

  • US 7,338,573 B2
  • Filed: 10/18/2002
  • Issued: 03/04/2008
  • Est. Priority Date: 11/26/2000
  • Status: Active Grant
First Claim
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1. The method of forming a multi-layer magnetic assembly in-line, said multi-layer magnetic assembly consisting of a magnetic layer, an adhesion promoting layer, and a printable substrate layer, said method comprising the steps of:

  • a) providing a hot melt magnetic composition, said hot melt magnetic composition comprising comprises about 80 wt-% to about 95 wt-% of at least one magnetic material and about 5 wt-% to about 20 wt-% of at least one thermoplastic material at an elevated temperature with an extruder;

    b) providing a printable substrate layer;

    c) providing an adhesion promoting layer on said printable substrate layer; and

    d) applying said hot melt magnetic composition at an elevated temperature directly to said printable substrate layer with a first slot die application head to form a magnetic layer having a thickness of about 50 microns to about 305 microns on said printable substrate layer, the adhesion promoting layer between said printable substrate layer and said magnetic layer.

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