Patent ID: 7182888
Filing Date: 2007-02-27
Classification: C08J,C08K,C08L

Abstract:
1. A method for producing a conductive masterbatch comprising a polyamide and conductive carbon black, said conductive carbon black being present in the form of at least one agglomerated particle having a major axis of 20 to 100 μm, wherein the number of said at least one agglomerated particle is 1 to 100 as observed under an optical microscope with respect to a contiguous area of 3 mm 2 , said method comprising: (1) feeding a polyamide to a twin-screw extruder or kneader, followed by melting of said polyamide to obtain a molten polyamide, (2) adding conductive carbon black and optionally an additional amount of a polyamide simultaneously to the molten polyamide in said extruder or kneader through said at least one second inlet thereof, followed by melt-kneading of the resultant mixture to obtain a conductive masterbatch.