Flexible, transparent film for electrostatic shielding
AssigneeMinnesota Mining and Manufacturing Company
InventorOrville M. Wiste
Life of this patent
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Abstract
A film providing electrostatic shielding comprises a first layer of a carrier material and a second layer of a thermoplastic, polymeric material, both layers being electrically insulative, flexible and transparent, and there further being a plurality of thin, conductive slivers suspended in the second layer. The slivers form an essentially two-dimensional, conductive network which is suspended in the second layer, and may be present in an amount as little as 2 g/m.sup.2. The slivers have a melting temperature greater than the melting temperature of the polymeric material, and the polymeric material has a melting temperature lower than that of the carrier material. The film passes at least 70% of visible light.
Claims19
A film for providing static shielding, comprising;
- a first layer of a carrier material which is electrically insulative, flexible, and transparent;
- a second layer of a homogenous polymeric material which is electrically insulative, flexible, transparent, and thermoplastic, said first layer being bonded to said second layer;
- and said second layer having a melting temperature which is lower than that of said carrier material;
- and
- a plurality of overlapping conductive slivers suspended in said second layer, forming an essentially two-dimensional, conductive network, said slivers having a melting temperature above the melting temperature of said polymeric material.
A film for providing static shielding, comprising;
- a first layer of a first polymeric material which is electrically insulative, flexible, dimensionally stable and transparent;
- a second layer of a second homogenous polymeric material which is electrically insulative, flexible, transparent, and thermoplastic, and has a melting temperature which is lower than the melting temperature of said first polymeric material, said first layer being bonded to said second layer;
- and
- a plurality of conductive slivers suspended in said second layer, forming an essentially two-dimensional, conductive network, said slivers further being present in an amount not greater than about 2 g/m.sup.2, and the film passing at least 70% of visible light.
A flexible, transparent film providing protection against static electric fields, comprising;
- a first layer, having first and second surfaces, of a first polymeric material which is electrically insulative, flexible, dimensionally stable and transparent, said first polymeric material being selected from the group consisting of polyester, polypropylene or nylon;
- a second layer, having first and second surfaces, of a second polymeric material which is electrically insulative, flexible, transparent, and thermoplastic, and has a melting temperature which is lower than the melting temperature of said first polymeric material, said second polymeric material being selected from the group consisting of low-density polyethylene, linear low-density polyethylene, high density polyethylene, ethylene methyl acrylate, ethylene vinyl acetate, or ethylene ethylacrylate, and said second surface of said first layer being bonded to said first surface of said second layer;
- a plurality of stainless steel slivers suspended in said second layer, proximate said first surface thereof, forming an essentially two-dimensional, conductive network, said slivers having a melting temperature which is higher than the melting temperature of said second polymeric material and further being present in an amount not greater than about 2 g/m.sup.2 ;
- and
- the film passing at least 70% of visible light.
Dependencies are inferred from the claim text.