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US 6,143,405 AGranted
Light colored, electrically conductive coated particles and composites made therefrom
Assignee3M Innovative Properties Company
InventorCharlotte M. Palmgren
Life of this patent
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Abstract
The present invention provides electrically conductive, light colored coated particles that are particularly useful for the manufacture of static dissipative compositions. This invention also relates to static dissipative composites made with these coated particles.
Claims44
A composition, wherein the composition comprises a plurality of coated particles, wherein each coated particle independently comprises:
- (a) a core particle, wherein the core particle is selected from the group consisting of glass fibers, ceramic fibers, ceramic ellipsoids containing void(s) such that the total volume of the void(s) is about 10 to about 98 percent of the total volume of the ceramic ellipsoids, glass ellipsoids containing void(s) such that the total volume of the void(s) is about 10 to about 98 percent of the volume of the glass ellipsoids;
- (b) a coating comprising a conductive indium tin oxide adhered to the core particle and wherein said coating has an average thickness of about 2 nanometers to about 100 nanometers;
- wherein the coated particles have a .DELTA.E.sub.w * value of less than about 50 and wherein the coated particles have a volume resistivity of greater than about 0.1 ohm-cm and less than about 1000 ohm-cm.
A composite comprising:
- (a) a polymeric binder;
- and
- (b) a composition, wherein the composition comprises a plurality of coated particles, wherein each coated particle independently comprises:
- (i) a core particle, wherein each core particle independently comprises a material selected from the group consisting of inorganic materials and polymeric materials;
- and
- (ii) a coating comprising a conductive metal oxide, wherein the coating is adhered to the particle;
- wherein the coated particles have a .DELTA.E.sub.w * of less than about 50 and wherein the coated particles have a volume resistivity of greater than about 0.1 ohm-cm and less than about 1000 ohm-cm;
- and
- wherein at least one of the following of (I) and (II) is true:
- (I) the composite has a surface resistivity of 10.sup.5 to 10.sup.12 ohms per square;
- (II) the composite has a volume resistivity of 10.sup.4 to 10.sup.11 ohm-cm.
8 more elements
Dependencies are inferred from the claim text.