Electrically conductive web
AssigneeMinnesota Mining and Manufacturing Company
InventorsThomas W. Lindsay, Walter M. Westberg
Life of this patent
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Abstract
An electrically conductive web for safely and quickly discharging static electricity accumulated on personnel is disclosed. The web comprises a semi-conductive polymeric surface layer, which is in electrical contact with a conductive foraminous layer. The relative conductivity of these layers result in desirable electrical discharge characteristics. The composite structure may be bonded to a suitable supporting substrate and suitable electrical connection between the conductive foraminous layer is made with an electrical ground. Charged personnel coming into contact with the semi-conductive surface layer have their static charge quickly and safely discharged to ground potential.
Claims9
A conductive web for discharging a static electric charge impressed thereon comprising:
- a layer of semiconductive thermoplastic polymeric material with a volume resistivity between 1.times.10.sup.7 and 1.times.10.sup.12 ohm-cm, in direct physical and electrical connection with,
- a foraminous layer, coated with carbon loaded resinous material to impart a resistivity of between 10.sup.3 ohms and 10.sup.7 ohms, forming a completed conductive web and,
- conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
A conductive web for discharging a static electric charge impressed thereon comprising:
- a layer of semiconductive thermoplastic polymeric material formed from a resin consisting essentially of a copolymer resin of 95% polyvinyl chloride and 5% polyvinyl acetate plasticized with diisodecyl phthalate and epoxidized soybean oil exhibiting a volume resistivity between 1.times.10.sup.7 and 1.times.10.sup.12 ohm-cm in direct physical and electrical contact with,
- a foraminous layer coated with carbon loaded resinous material to impart a resistivity of between 10.sup.3 and 10.sup.7 ohms, and
- conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
A conductive web for discharging a static electric charge impressed thereon comprising:
- a layer of semiconductive thermoplastic polymeric material formed from a resin consisting essentially of cellulose acetate butyrate plasticized with a low viscosity monomeric plasticizer characterized as a butyl-capped, ethylene oxide oligmer exhibiting a volume resistivity between 1.times.10.sup.7 ohm-cm and 1.times.10.sup.12 ohm-cm, in direct physical and electrical connection with,
- a foraminous layer, coated with carbon loaded resinous material to impart a resistivity between 1.times.10.sup.3 and 1.times.10.sup.7 ohms and
- conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
Dependencies are inferred from the claim text.