Electromagnetic wave-shielding materials

Details Electromagnetic wave-shielding materials Electromagnetic wave-shielding materials

1982-11-23

1985-04-02

Barr, Josephine L.

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

252511, 524495, 524496, 524441, 523137, H01B 106

Patent

active

045086400

ABSTRACT:
An electromagnetic wave-shielding material is disclosed. The material is comprised of one or more electromagnetic wave-shielding layers and one or more surface layers. The shielding layers are comprised of a thermoplastic resin, an aluminum or aluminum alloy and electrically conductive carbon black. The surface layers are comprised substantially of thermoplastic resin. The proportion of the carbon black and aluminum in the shielding layer are from 5 to 50% by volume and 5 to 50% by volume, respectively, provided the total proportion of the carbon black and aluminum is 10 to 60% by volume. The difference in solubility parameter between the thermoplastic resin of the surface layer and the thermoplastic resin of the shielding layer is 3.0 or less. The material has superior mechanical strength and electromagnetic wave-shielding properties.

REFERENCES:
patent: 3468753 (1969-09-01), Vincent et al.
patent: 4006114 (1977-02-01), Carlson
patent: 4169816 (1979-10-01), Tsien
patent: 4234469 (1980-11-01), Ohta et al.
patent: 4339374 (1982-07-01), Olschewski et al.
patent: 4395362 (1983-07-01), Satoh et al.
"Conductive Composites for EMI Shielding", Battelle Columbus Laboratories, 6-14-78.

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