Patent ID: 6459358
Filing Date: 2002-10-01
Classification: C08L,H01B,H01C

Abstract:
An electrically conducting material exhibiting improved flexibility for use in a current limiting PTC polymer device, consisting essentially of the cured reaction product of:(A) a resin component comprising a mixture of: (i) 100 parts by weight of a diepoxide resin selected from the group consisting of the diglycidyl ether of ethylene glycol oligomer, the diglycidyl ether of propylene glycol oligomer, and the diglycidyl ether of butylene glycol oligomer, (ii) 0 to 15 parts by weight of a bisphenol A epoxy resin, and (iii) 0 to 20 parts by weight of an epoxidized polybutadiene (B) 80 to 150 parts by weight of a conductive filler, and (C) a curing agent, where, if no bisphenol A epoxy is present, at least 2.0 parts by weight of epoxidized polybutadiene is added to component (i) and wherein the electrically conducting material exhibits positive temperature coefficient of resistance behavior.