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US 7,547,403 B2Granted
Electroconductive resin composition
AssigneePolyplastics Co., Ltd.
InventorsTakayuki Miyashita, Takashi Usami
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AssigneePolyplastics Co., Ltd.
InventorsTakayuki Miyashita, Takashi Usami
Estimating the term…
To provide a resin material excellent in electric conductivity and judiciously usable in the manufacture of fuel cell separators and so forth. An electroconductive resin composition which comprises 100 parts by weight of a liquid-crystalline polymer (A) and 200 to 500 parts by weight of at least one species of graphite (B) selected from synthetic graphite, flake graphite and amorphous graphite with a fixed carbon content of not less than 95% by weight and an average particle size of 50 to 200 μm as incorporated in the polymer, the composition resulting from melt-kneading under such conditions that the ratio Q/N, where Q (kg) is the hourly extrusion throughput rate during kneading and N (rpm) is the screw revolution rate, may amount to 0.1 to 1.5, the composition having a volume resistivity of not more than 2×10−2 Ω·cm.
An electroconductive resin composition which comprises 100 parts by weight of a liquid-crystalline polymer (A) and 200 to 500 parts by weight of at least one species of graphite (B) selected from the group consisting of synthetic graphite, flake graphite and amorphous graphite, having a fixed carbon content of not less than 95% by weight and an average particle size of 50 to 200 μm, as incorporated in said polymer, said composition resulting from melt-kneading under such conditions that the ratio Q/N, where Q (kg) is the hourly extrusion throughput rate during kneading and N (rpm) is the screw revolution rate, ay amount to 0.1 to 1.5, said composition having a volume resistivity of not more than 5×10−2 Ω·cm.
A method of preparing an electroconductive resin composition, which comprises incorporating 200 to 500 parts by weight of graphite (B) having a fixed carbon content of not less than 95% by weight and an average particle size of 50 to 200 μm into 100 parts by weight of a liquid-crystalline polymer (A) and melt-kneading the resulting composition using an extruder under such conditions that the ratio Q/N, where Q (kg) is the hourly extrusion throughput rate during kneading and N (rpm) is the screw revolution rate, may amount to 0.1 to 1.5.
Dependencies are inferred from the claim text.