Patent ID: 6162580
Filing Date: 2000-12-19
Classification: G03F,H05K

Abstract:
A process for forming a polyimide pattern which comprises the steps of:(1) selecting a Polymeric polyimide precursor which has an amide bond density of from 1.5 to 2.42 mol/kg from the group consisting of polymeric aromatic polyimide precursors which have a repeating unit represented by the formula: ##STR55## wherein X is selected from the group consisting of an unfluorinated aromatic ring bonded to at least four substituents and an unfluorinated structure bonded to at least four substituents that is composed of up to a total of four aromatic rings linked to each other via bonds to at least one type of linker selected from the group consisting of O, S, CO, CH.sub.2, SO, SO.sub.2, and a single bond,--COR and --COR' are substituents that occupy the ortho positions of aromatic ring X with respect to the CONH substituent,R and R' are OR.sub.1 wherein R.sub.1 is a group containing a carbon--carbon double bond, andY is a structure bonded to at least two substituents, wherein an aromatic ring bonded to the NH substituent, or an aromatic ring adjacent to the aromatic ring bonded to the NH substituent via an O linker, is substituted with an electron-withdrawing group lacking hydrogen that is selected from the group consisting of an alkylcarbonyl group, a nitrile group, and an alkylsulfone group;(2) applying a film of a photosensitive composition, which comprises the polymeric polyimide precursor, a photopolymerization initiator and a solvent, and which, at a thickness of 10 .mu.m, exhibits an absorbance of 1.5 or less upon exposure to light of wavelength of 365 nm, to an article capable of being covered by the film;(3) exposing the applied film to i-line light;(4) removing unexposed areas of the film with a developing solution to form a pattern; and(5) heat-curing the resultant pattern.