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US 5,399,295 AGranted
EMI shielding composites
AssigneeThe Dow Chemical Company
InventorsJeffrey Gamble, Larry D. Yats
Life of this patent
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Abstract
A composite sheet is disclosed comprising a continuous matrix of a synthetic resinous material having randomly dispersed therein conductive fibers and a particulate, conductive or semi-conductive filler. In addition to providing excellent EMI shielding properties, the composite sheets are formable and are of sufficient strength to act as structural components.
Claims13
A composite sheet comprising
- (a) a continuous matrix of a polymeric resin, having randomly dispersed therein;
- (b) from about 0.05 to about 30 weight percent of the composite of a fine particulate conductive or semi-conductive filler material, and
- (c) from about 0.25 to about 45 weight percent of the composite of conductive fibers having an aspect ratio from 25 to 2000, a diameter of from 2.5 .mu.m to 50 .mu.m, and a length from 1.6 mm to 25 mm, said fibers being randomly oriented in two dimensions substantially in the plane defined by the sheet.
Dependencies are inferred from the claim text.