Patent ID: 7540980

Claim:
A conductive resin composition produced by melt-kneading a mixture comprising: a polyamide (A), at least one polyphenylene ether (B) selected from the group consisting of a non-terminal-modified polyphenylene ether and a terminal-modified polyphenylene ether, wherein said terminal-modified polyphenylene ether is obtained by melt-kneading a non-terminal-modified polyphenylene ether with a first low molecular weight modifier compound (b) which functions as a compatibility agent for said polyamide (A) and said polyphenylene ether (B), a rubbery polymer (C), at least one conductive carbonaceous material (D) selected from the group consisting of a conductive carbon black and a conductive carbon fibril, and a second low molecular weight modifier compound (E) which functions as a compatibility agent for said polyamide (A) and said polyphenylene ether (B), wherein said first low molecular weight modifier compound (b) and said second low molecular weight modifier compound (E) are the same or different, wherein said mixture has the following characteristics: (1) the amount of said at least one conductive carbonaceous material (D) is in the range of from 0.2 to 3% by weight, based on the total weight of said components (A)to(E), (2) the amount of said second low molecular weight modifier compound (E) is in the range of from more than 0.01% by weight to less than 0.20% by weight, based on the total weight of said components (A) to (E), and (3) the amount (a) of a volatile substance contained in said at least one polyphenylene ether (B) satisfies the following formula: 0≦ a ≦−7.3 ×E +1.83, wherein E represents the % by weight of said component (E), based on the total weight of said components (A) to (E), said amount (a) being expressed in terms of a weight decrease (% by weight) of said at least one polyphenylene ether (B) as measured by subjecting said at least one polyphenylene ether (B) to vacuum drying under a vacuum of 1.3×10 2 to 6.7×10 3 Pa at 180° C. for 1 hour, wherein the weight decrease is calculated by the following formula: weight decrease (% by weight) ={(weight of polyphenylene ether (B) prior to vacuum drying−weight of polyphenylene ether (B) after vacuum drying)/weight of polyphenylene ether (B) prior to vacuum drying}×100.