Electrically Conductive Resin Composition Of A Polyamide Type, Process For The Production Thereof, And Cap For Fuel Tank Comprising It

• US 20080073620A1
• Filed: 09/16/2005
• Published: 03/27/2008
• Est. Priority Date: 09/29/2004
• Status: Active Grant

• Current Assignee: Toyobo MC Corp.
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Sakai, Satoshi, Taniguchi, Akira, Nakagawa, Hiroyuki, Ishida, Kazuhisa, Terashima, Kiyomitsu
• Granted Patent: US 7,544,313 B2
• Time in Patent Office: Days
• US Class Current: 252/511
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 2205/035 containing four or more polymers in a blend
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 51/06 grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 77/02 Polyamides derived from omega-amino carboxylic acids or from lactams thereof C08L77/10 takes precedence
• CPC Class Codes: C08L 77/06 Polyamides derived from polyamines and polycarboxylic acids C08L77/10 takes precedence

Abstract

An electrically conductive resin composition of a polyamide type, characterized in that, (A) 95 to 40% by mass of polyamide resin, (B) 5 to 30% by mass of electrically conductive carbon black, (C) 10 to 40% by mass of an ethylene-α-olefin copolymer having a reactive functional group which is able to react with a terminal group of the polyamide resin and/or an amide group of the main chain and (D) 1 to 10% by mass of a high-density polyethylene resin are compounded; the polyamide resin (A) forms a continuous phase; the ethylene-α-olefin copolymer (C) in particles having an average particle diameter of not more than 2 μm is present by being dispersed in the continuous phase of the polyamide resin (A); and not less than 80% by mass of the electrically conductive carbon black (B) is present by being dispersed in the polyamide resin phase (A) which is a continuous phase, as well as a cap for fuel tank comprising it.

Claims

1-4. -4. (canceled)

5. A cap for fuel tank, wherein the cap comprises an electrically conductive resin composition of a polyamide type, the electrically conductive resin composition comprising the following components compounded:

a polyamide resin (A) forming a continuous phase,

electrically conductive carbon black (B), wherein not less than 80% by mass of the electrically conductive carbon black (B) is dispersed in the continuous phase of the polyamide resin,

particles of an ethylene-α

-olefin copolymer (C) having a reactive functional group which is able to react with a terminal group of the polyamide resin and/or an amide group of the main chain of the polyamide resin, wherein the particles of the ethylene-α

-olefin copolymer (C) have an average particle diameter of not more than 2 μ

m and are dispersed in the continuous phase of the polyamide resin (A), and

a high-density polyethylene resin (D).

6. The cap for fuel tank according to claim 5, wherein a molded product obtained from the electrically conductive resin composition has volume intrinsic resistivity of not more than 1×

10¹¹ Ω

·

cm and Izod impact strength of not less than 300 J/m.

7. The cap for fuel tank according to claim 5, wherein the molded product obtained from the electrically conductive resin composition has a Taber'"'"'s abrasion value of not more than 25 mg.

8. The cap for fuel tank according to claim 6, wherein the molded product obtained from the electrically conductive resin composition has a Taber'"'"'s abrasion value of not more than 25 mg.