Electrical device containing a radiation-sensitive polyimide precursor composition derived from a diaryl fluoro compound

Claim 1

An electrical device coated with a polymerized polyimide structure resulting from a radiation-sensitive polyimide precursor composition, said precursor composition comprising: a. a polymer of the formula ##STR14## wherein n is a positive integer corresponding to the number of units in the polymer and is sufficiently large to provide the polymer with a number average molecular weight of about 1500-15,000 as determined by vapor pressure osmometry, and wherein for any particular unit in the polymer: → denotes isomerism; R 1 is a divalent aromatic, aliphatic or cycloaliphatic radical containing at least 2 carbon atoms; R 2 and R 3 are selected from the group consisting of a hydrogen radical and any organic radical containing a photopolymerizable olefinic double bond, at least one of R 2 and R 3 being said organic radical; and R 4 and R 5 are selected from the group consisting of perfluoro and perhalofluoro aliphatic hydrocarbons having 1 to 8 carbons; b. a radiation sensitive polymerizable polyfunctional acrylate compound; and c. a photopolymerization initiator system comprising hydrogen donor initiator and aromatic biimidazole.