Magnetic substrates with high magnetic loading
First Claim
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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Accused Products
Abstract
A method of forming a magnetic assembly having at least one magnetic layer having dimensions of thickness, width and length, and at least one printable substrate layer having dimensions of thickness, width and length, including the steps of providing a molten magnetic composition including about 70 wt-% to about 95 wt-% of at least one magnetic material and about 5 wt-% to about 30 wt-% of at least one thermoplastic binder, forming the magnetic composition into a magnetic layer at an elevated temperature and directly applying the magnetic layer at an elevated temperature to a first surface of a printable substrate layer wherein. An adhesion promoting composition may be further provided between the magnetic layer and the printable substrate layer for improving adhesion between the magnetic layer and the printable substrate layer.
118 Citations
19 Claims
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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:
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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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2. A method of forming a magnetic assembly having at least one magnetic layer having dimensions of thickness, width and length, and at least one printable substrate layer having dimensions of thickness, width and length, the method comprising the steps of:
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a) providing a hot melt magnetic composition at an elevated temperature with an extruder, said magnetic hot melt composition comprising about 75 wt-% to about 95 wt-% of at least one magnetic material and about 5 wt-% to about 25 wt-% of at least one thermoplastic binder; b) providing a printable substrate layer selected from paper, paper products and pasteboard; c) providing an adhesion promoting layer on said printable substrate layer; d) applying said hot melt magnetic composition directly with a slot die head to said printable substrate layer to form a magnetic layer on said printable substrate layer, said magnetic layer having a thickness of about 50 microns to about 305 microns, said adhesion promoting layer between said printable substrate layer and said hot melt magnetic layer; and e) subjecting said magnetic assembly to a strong magnetic field sufficient to result in a permanent magnetic effectin the assembly. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification