Patent ID: 6521695
Filing Date: 2003-02-18
Classification: C08K,C08L,H01B

Abstract:
An electrically insulating composition consisting essentially ofa) as a major component, a polymer composition material selected from the group consisting of an olefin homo-polymer, a copolymer or terpolymer of ethylene with at least one comonomer selected from the group consisting of propylene, butene-1, hexene-1, octene-1, decene-1, norbonene, butadiene, vinyl acetate, ethyl acrylate, methyl acrylate, isobutyl acrylate and methyl vinyl ether, and mixtures of said olefin homopolymer, copolymer and terpolymer; b) an effective amount of a polymeric additive melt blended into said polymer material, said additive having: a hydrophilic portion, causing a water absorption in said insulating composition within a selected absorption range, and a compatible portion with said insulating composition, causing an additive loss from said insulating composition, by contact with water, lower than a selected loss value, said hydrophilic portion having a mobility suitable to allow the hydrophilic portion of the additive to effectively reach and link water molecules diffusing in said insulating composition, thereby providing an electrical breakdown strength decay in the insulation composition lower than 30% in a 30 day accelerated aging test in water.