Minnesota Mining and Manufacturing Company

3m Innovative Properties Company

Nanayakkara Liyanage Somasiri

Justine A Mooney

Gary A Shreve

Curtis Roy Guilbert

Alan George Hulme-Lowe

Eric Daniel Morrison

William Jeffrey Clatanoff

A method of altering a portion of the semiconductive layer of an electric power cable, to increase its resistance so as to render it electrically insulative. The semiconductive layer is loaded with carbon powder which forms chains to provide conductive pathways through the layer. By introducing an intercalant into the semiconductive layer, which causes the layer to swell, the conductive pathways are interrupted and the material is rendered insulative (&gt;10.sup.4 .OMEGA.-cm). The intercalant may be a polymerizable material with a curing agent which is cured in situ, i.e., without removing the semiconductive layer from the cable. By this method, flashover to the semiconductive layer at a cable splice or termination may be prevented without requiring tedious removal of the exposed portion of the semiconductive layer. The method is usable with both strippable and coextruded semiconductive layers.

Method for altering cable semiconductive layer

The invention comprises a self supporting electronic packaging article comprising an insulative polymer overcoated with an antistatic/protective coating system comprising from about 8 mg/m.sup.2 to about 70 mg/m.sup.2 vanadium pentoxide, from about 36 mg/m.sup.2 to about 270 mg/m.sup.2 of a polymer latex having a hydrophilic functionality, and from about 210 mg/m.sup.2 to about 842 mg/m.sup.2 of a nonsulfonated protective topical binder, all of which may be contained in a single coating, or which may be contained in a two-layer coating system.

Static dissipative electronic packaging article

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Austin, TX, United States of America

Nanayakkara Liyanage Somasiri