Magnetic composite
First Claim
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1. A magnetic particle and polymer viscoelastic composite comprising:
- (a) a magnetic particle consisting of a ferrite having an exterior coating of about 0.005 to 8 wt. %, based on the composite, of an interfacial modifier, the magnetic particle having a particle size greater than about 1 micron, a particle size distribution such that there are greater than about 5 wt. % of magnetic particles in the range of 1 to 1000 microns to form the composite; and
(b) a thermoplastic polymer phase;
wherein the viscoelastic composite has a tensile elongation of about at least 5%.
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Abstract
The invention relates to a polymer composite having magnetic properties that are enhanced or increased in the composite. Such properties include color, thermal conductivity, electrical conductivity, density, improved malleability and ductility viscoelastic and thermoplastic or injection molding properties.
294 Citations
26 Claims
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1. A magnetic particle and polymer viscoelastic composite comprising:
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(a) a magnetic particle consisting of a ferrite having an exterior coating of about 0.005 to 8 wt. %, based on the composite, of an interfacial modifier, the magnetic particle having a particle size greater than about 1 micron, a particle size distribution such that there are greater than about 5 wt. % of magnetic particles in the range of 1 to 1000 microns to form the composite; and (b) a thermoplastic polymer phase; wherein the viscoelastic composite has a tensile elongation of about at least 5%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A magnetic particle and vinyl polymer composite comprising:
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(a) a magnetic particle consisting of a ferrite having an exterior coating of about 0.005 to 8 wt. %, based on the composite of an interfacial modifier, the particle having a particle size greater than about 1 micron, a particle size distribution such that there are greater than about 5wt. % of magnetic particles in the range of 1 to 1000 microns; and (b) a vinyl polymer phase; wherein the viscoelastic composite has a tensile elongation of about at least 5%. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A magnetic particle-polymer composite comprising a magnetic particle consisting of a ferrite having an exterior coating of about 0.005 to 8 wt. % of an interfacial modifier, the particle having a range of particle sizes such that about at least 5 wt.-% of particles are in the range of about 1 to 250 microns, and a polymer, the composite having a van der Waals'"'"' dispersion bond strength between molecules in adjacent particles of less than about 4 kJ-mol−
- 1 and a bond dimension of 1.4 to 1.9 Å
. - View Dependent Claims (19)
- 1 and a bond dimension of 1.4 to 1.9 Å
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20. A shaped magnetic article comprising an object magnetized by exposure to a magnetic field;
- wherein in the article comprises about 90 to 50 volume-% of a magnetic particle consisting of a ferrite having an exterior coating of about 0.005 to 8 wt. % of an interfacial modifier, the particle having a particle size greater than 1 microns, the magnetic particles having a particle size distribution such that at least 10 wt.-% of the polymer particles are within about 1 to 500 microns, a circularity greater than 13 and an aspect ratio less than 1;
3 and about 10 to 50 volume-% of a polymer phase. - View Dependent Claims (21, 22)
- wherein in the article comprises about 90 to 50 volume-% of a magnetic particle consisting of a ferrite having an exterior coating of about 0.005 to 8 wt. % of an interfacial modifier, the particle having a particle size greater than 1 microns, the magnetic particles having a particle size distribution such that at least 10 wt.-% of the polymer particles are within about 1 to 500 microns, a circularity greater than 13 and an aspect ratio less than 1;
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23. A shaped magnet article comprising an object magnetized by exposure to a magnetic field, the article comprising about 87 to 48 volume-% of a magnetic particle, the particle consisting of a ferrite having an exterior coating of about 0.005 to 8 wt. % of an interfacial modifier, the particle having a particle size greater than 10 microns, the magnetic particles having a particle size distribution having at least 10 wt.-% of a particles within about 10 to 100 microns, a circularity greater than 13 and an aspect ratio less than 1:
- 3;
about 13 to 61 volume-% of a polymer phase. - View Dependent Claims (24, 25, 26)
- 3;
Specification