Electroconductive resin composition for moulding, and shield moulded therefrom

Claim 2

An electroconductive resin composition for molding, which comprises columnar pellets (5,6) of a specific length made of a bundle (5A or 5B) of iron-based metal fibers as an essential component and at least one bundle (5B or 5A) of at least another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as independent electroconductive fiber cores, coated with a thermoplastic resin (6) having a specific range of heat distortion temperature continuously in the longitudinal direction.

Claim 3

An electroconductive resin composition for molding which comprises columnar single-core pellets (5,6)of a specific length, each made of a bundle of iron-based metal fibers as an electroconductive core, coated with a thermoplastic resin having a specific range of heat distortion temperature continuously in the longitudinal direction and at least another kind of single-core, columnar pellets, each made of a bundle of another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as an electroconductive core, coated with the thermoplastic resin continuously in the longitudinal direction.

Claim 4

An electroconductive resin composition for molding which comprises columnar single-core pellets (5,6)of a specific length, each made of a bundle of iron-based metal fibers as an electroconductive core, coated with a thermoplastic resin having a specific range of heat distortion temperature continuously in the longitudinal direction and at least another kind of single-core, columnar pellets, each made of a bundle of another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as an electroconductive core, coated with the thermoplastic resin continuously in the longitudinal direction.

Claim 5

An electroconductive resin composition for molding, which comprises columnar multi-core pellets, each made of a bundle of iron-based metal fibers as an essential component and at least one bundle of at least another kind of electroconductive fibers of different material in a different diameter than that of the iron-­based metal fibers as independent electroconductive fiber cores, coated together with a thermoplastic resin having a specific range of heat distortion temperature continuously in the longitudinal direction.

Claim 6

An electroconductive resin composition for molding, which comprises columnar multi-core pellets, each made of a bundle of iron-based metal fibers as an essential component and at least one bundle of at least another kind of electroconductive fibers of different material in a different diameter than that of the iron-­based metal fibers as independent electroconductive fiber cores, coated together with a thermoplastic resin having a specific range of heat distortion temperature continuously in the longitudinal direction.

Claim 7

An electroconductive resin composition for molding, according to Claim 1, 2 or 3, wherein the iron-based metal fibers have an aspect ratio of 400 to 2,000 and a diameter of 5 to 15 µm, and the electrocon­ductive fibers of different material in a different diameter are at least one of copper-based metal fibers, aluminum-based metal fibers and metal-coated fibers having an aspect ratio of 50 to 600 and a diameter of 15 to 60 µm.

Claim 8

An electroconductive resin composition for molding according to Claim 4, wherein a mixing ratio of the iron-based metal fibers to the thermoplastic resin is 1 to 10% by weight, a mixing ratio of the copper-based metal fibers to the thermoplastic resin is 20 to 30% by weight, a mixing ratio of the aluminum-based metal fibers to the thermoplastic resin is 2 to 15% by weight, and a mixing ratio of the metal-coated fibers to the thermo­plastic resin is 5 to 15% by weight.

Claim 9

An electroconductive resin composition for molding according to Claim 4, wherein the iron-based metal fibers are stainless steel fibers, the copper-based metal fibers are at least one of brass and nickel silver fibers, the aluminum-based metal fibers are aluminum fibers, and the metal-coated fibers are at least one of nickel-plated carbon fibers, copper-nickel-plated glass fibers and copper-nickel-plates polymer fibers.

Claim 10

An electroconductive resin composition for molding according to Claim 1, 2 or 3, wherein the heat distortion temperature of the thermoplastic resin is 80°C to 210°C.

Claim 11

An electroconductive resin composition for molding according to Claim 7, wherein the heat distortion temperature of the thermoplastic resin is 100° to 150°C.

Claim 12

An electroconductive resin composition for molding according to Claim 7, wherein the heat distortion temperature of the thermoplastic resin is 110° to 130°C.

Claim 13

An electroconductive resin composition for molding according to Claim 1, 2 or 3, wherein the thermoplastic resin is one of ABS resin, high impact polystyrene, polycarbonate, polyphenyleneether, polyether­sulfone, polybutylene terephthalate, nylon, polypropylene, ABS resin/polycarbonate polymer alloy, high impact polystyrene/polycarbonate polymer alloy, polyphenylene-­ether/polycarbonate polymer alloy, and polybutyene terephthalate/polycarbonate polymer alloy.

Claim 14

An electroconductive resin composition for molding according to Claim 1, 2 or 3, wherein the thermoplastic resin contains 5 to 10% by weight of a filler on the basis of the thermoplastic resin.

Claim 15

An electroconductive resin composition for molding according to Claim 11, wherein the filler is at least one of quartz power having an average particle size of 20 to 30 µm, metal flakes having a square of 1 to 2 mm x 1 to 2 mm and plated mica flakes having a square of 1 to 2 mm x 1 to 2 mm.

Claim 16

An electroconductive resin composition for molding according to Claim 12, wherein the metal flakes are Mg, Al or Ti flakes.

Claim 17

An electroconductive resin composition for molding according to Claim 1, 2 or 3, wherein the thermoplastic resin contains 0.5 to 5% by weight in total of a pigment, a flame retarder, an internal release agent, and an antioxidant.

Claim 18

An electroconductive resin composition for molding according to Claim 1 or 3, where the columner pellets have a length of 3 to 10 mm.

Claim 19

An electroconductive resin composition for molding according to Claim 2, wherein the single-core, columnar pellets, each made of a bundle of iron-based metal fibers, have a length of 6 to 10 mm, and the single-core columnar pellets, each made of a bundle of another kind of electroconductive fibers of different material in a different diameter, have a length of 3 to 9 mm.

Claim 20

An electromagnetic wave interference shield structure, molded from an electroconductive resin composition for molding, which comprises columnar pellets of a specific length, made of a bundle of iron-based metal fibers as an essential component and at least one bundle of at least another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as independent electroconduc­tive fiber-cores, coated with a thermoplastic resin having a specific range of heat distortion temperature continu­ously in the longitudinal direction, an electroconductive resin composition for molding which comprises columnar single-core pellets of a specific length, each made of a bundle of iron-based metal fibers as an electroconductive core, coated with a thermoplastic resin having a specific range of heat distortion temperature continuously in the longitudinal direction and at least another kind of single-core, columnar pellets, each made of a bundle of another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as an electroconductive core, coated with the thermoplastic resin continuously in the longitudinal direction, or electroconductive resin composition for molding, which comprises columnar multi-core pellets, each made of a bundle of iron-based metal fibers as an essential component and at least one bundle of at least another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as independent electroconductive fiber cores, coated together with a thermoplastic resin having a specific range of heat distortion temperature continuously in the longitudinal direction.

Claim 21

An electromagnetic wave interference shield structure, molded from an electroconductive resin composition for molding, which comprises columnar pellets of a specific length, made of a bundle of iron-based metal fibers as an essential component and at least one bundle of at least another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as independent electroconduc­tive fiber-cores, coated with a thermoplastic resin having a specific range of heat distortion temperature continu­ously in the longitudinal direction, an electroconductive resin composition for molding which comprises columnar single-core pellets of a specific length, each made of a bundle of iron-based metal fibers as an electroconductive core, coated with a thermoplastic resin having a specific range of heat distortion temperature continuously in the longitudinal direction and at least another kind of single-core, columnar pellets, each made of a bundle of another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as an electroconductive core, coated with the thermoplastic resin continuously in the longitudinal direction, or electroconductive resin composition for molding, which comprises columnar multi-core pellets, each made of a bundle of iron-based metal fibers as an essential component and at least one bundle of at least another kind of electroconductive fibers of different material in a different diameter than that of the iron-based metal fibers as independent electroconductive fiber cores, coated together with a thermoplastic resin having a specific range of heat distortion temperature continuously in the longitudinal direction.

Claim 22

An electromagnetic wave interference shield structure according to Claim 17, wherein the electro­magnetic wave shield structure is a housing for electronic equipments, or an electronic part containing for preventing electrostatic charging, molded by injection molding, transfer molding, or vacuum-pressure-forming molding.

Claim 23

An electromagnetic wave interference shield structure according to Claim 17, wherein the electromagnetic wave shield structure is a wall for electromagnetic wave shield or a protective plate for an electronic black board or display board, molded by sheet extrusion molding.