Patent ID: 7015260

Claim:
A corona resistant composition comprising: A. a polymer matrix comprising at least 50 weight percent of a high temperature polymer, the high temperature polymer having one or more moieties from a group consisting of: amide, imide, ether, sulfone, epoxy, carbonate, and ester; B. a corona resistant composite filler: i. in an amount, based upon the total weight of the corona resistant composition, in a range between and including any two of the following weight percentages: and 50-weight percent, ii. having a mean particle size in a range between and including any two of the following sizes: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 125, 150, 175, 200, 250, 300, 350, 400, 450, and 500 nanometers, wherein at least 80, 85, 90, 92, 94, 95, 96, 98, 99 or 100 percent of the dispersed composite filler is within the above defined size range, iii. comprising a ceramic oxide component and an organic component, wherein at least a portion of an interface between the two components comprises an organo-siloxane or organo-metaloxane moiety, C. wherein the composition is a film having a thickness between any two of the following numbers, 8, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 80, 100, 125, 150, 175, 200, 300, 400 and 500 microns, and D. wherein the film has a mechanical elongation of greater than 60, 65 or 70 percent.