Patent ID: 6660795
Filing Date: 2003-12-09
Classification: C08K

Abstract:
A polymeric PTC composition comprising:an organic polymer, a conductive filler including carbon black having an iodine adsorption of greater than about 20 mg/g carbon less than about 60 mg/g carbon and a dibutyl phthalate absorption of greater than about 115 cc/100 g to less than about 170 cc/100 g and an antioxidant selected from the group consisting of N,Nâ€²1,6-hexanediylbis (3.5-bis 11-dimethylethyl)-4-hydroxybenzene) propanamide (N-stearoyl-4-aminophenol, N-lauroyl-4-aminophenol, polymerized 1,2-dihydro-2,2,4-trimethyl guinoline, and mixtures thereof and, optionally, one or more additives selected from the group consisting of inert fillers, flame retardants, stabilizers, anti-ozonants, accelerators, pigments, foaming agents, crosslinking agents, coupling agents, co-agents and dispersing agents.