Patent ID: 7892720

Claim:
A fluorinated aromatic resin film having a concavo-convex shape, which is obtained by coating a substrate with a negative photosensitive fluorinated aromatic resin composition to form a negative photosensitive fluorinated aromatic resin composition film, followed by exposure and development, wherein the negative photosensitive fluorinated aromatic resin composition comprises the following fluorinated aromatic prepolymer, at least one photosensitizer and at least one solvent, wherein the fluorinated aromatic prepolymer is obtained by subjecting either one or both of a compound (Y-1) having a crosslinkable functional group (A) and a phenolic hydroxyl group, and a compound (Y-2) having a crosslinkable functional group (A) and a fluorinated aromatic ring, to a condensation reaction in the presence of a HF-removing agent, with a fluorinated aromatic compound (B) represented by the following formula (1): wherein n is an integer of from 0 to 3, each of a and b which are independent of each other, is an integer of from 0 to 3, each of Rf 1 and Rf 2 which may be the same or different from each other, is a fluorinated alkyl group having at most 8 carbon atoms, and F in the aromatic ring represents that hydrogen atoms of the aromatic ring are all substituted by fluorine atoms, and a compound (C) having at least 3 phenolic hydroxyl groups, and which has crosslinkable functional groups (A) and ether bonds and has a number average molecular weight of from 1×10 3 to 5×10 5 .