| US 7,540,980 B2 | ||
| Conductive resin composition and molded object | ||
| Kazuya Noda, Sodegaura (Japan); Hiroshi Nishino, Fujisawa (Japan); and Norio Sakata, Sodegaura (Japan) | ||
| Assigned to Asahi Kasei Chemicals Corporation, Tokyo (Japan) | ||
| Appl. No. 10/570,272 PCT Filed Sep. 10, 2004, PCT No. PCT/JP2004/013230 § 371(c)(1), (2), (4) Date Mar. 02, 2006, PCT Pub. No. WO2005/026260, PCT Pub. Date Mar. 24, 2005. |
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| Claims priority of application No. 2003-321436 (JP), filed on Sep. 12, 2003. | ||
| Prior Publication US 2007/0029530 A1, Feb. 08, 2007 | ||
| Int. Cl. H01B 1/22 (2006.01) | ||
| U.S. Cl. 252—511 [524/495; 280/770] | 20 Claims |
| 1. 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 1.3×102 to 6.7×103 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.
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