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US 6,660,795 B2Granted
PTC conductive polymer compositions
AssigneeTherm-O-Disc, Incorporated
InventorEdward J. Blok
Life of this patent
Estimating the term…
Abstract
The invention provides polymeric PTC compositions and electrical PTC devices with higher voltage capability and improved electrical stability. The PTC compositions include at a minimum an organic polymer and a conductive filler including carbon black having an iodine adsorption of less than about 60 mg/g carbon and a dibutyl phthalate absorption of greater than about 115 cc/100 g. Depending on device design, the composition can be used in low to high voltage applications.
Claims36
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,N′1,6-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.
A polymeric PTC composition comprising:
- an organic polymer, a conductive filler including carbon black having an iodine adsorption of less than about 60 mg/g carbon and a dibutyl phthalate absorption of greater than about 115 cc/100 g, an antioxidant selected from the group consisting of N,N′1,6-hexanediylbis (3,5-bis(1,1-dimethylethyl)-4-hydroxybenzene) propanamide, (N-stearoyl-4-aminophenol, N-lauroyl-4-aminophenol, polymerized 1,2-dihydro-2,2,4-trimethyl quinoline, 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.
Dependencies are inferred from the claim text.