Electroconductive thermoplastic resin sheets and molded articles

Details Electroconductive thermoplastic resin sheets and molded articles Electroconductive thermoplastic resin sheets and molded articles

1989-07-07

1990-07-03

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

264257, 428282, 428286, 428297, 428300, B32B 506

Patent

active

049390279

ABSTRACT:
The present invention provides a thermoplastic resin sheet and its molded article for a packaging material which is heated in a microwave oven and for shielding electromagnetic waves. The above-mentioned resin sheet and molded article are characterized by generating heat when irradiated with microwaves.
The present invention is directed to an electroconductive thermoplastic resin sheet which is prepared by first superposing an electroconductive nonwoven fabric mainly comprising electroconductive fibers and heat-meltable fibers upon one surface, both surfaces, or a part or all of the surface of a thermoplastic resin film as a base material layer, further superposing a thermoplastic resin film as a protective layer upon the nonwoven fabric so that they may come in contact with each other, heating and contact-bonding them at a temperature of the melting point or higher of the heat-meltable fibers. The present invention is also directed to an electroconductive thermoplastic resin-molded article which is prepared by heating the aforesaid electroconductive thermoplastic resin sheet up to a temperature at which the resin sheet softens, setting the resin sheet between a pair of female and male molds, the surface of at least one of which comprises a heat-resistant rubber, and then mating both the molds to mold the resin sheet.

REFERENCES:
patent: 4532099 (1985-07-01), Kaji

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