Patent ID: 8105759

Claim:
A printed circuit board production process comprising the steps of: (A) forming a photosensitive layer of a photosensitive element on a board, wherein the photosensitive layer comprises a photosensitive resin composition, wherein the photosensitive resin composition comprises (a) a binder polymer; (b) a photopolymerizing compound with a polymerizable ethylenic unsaturated bond; (c) a photoradical polymerization initiator containing a 2,4,5-triarylimidazole dimer or a derivative thereof; and (d) a compound represented by the following general formula (1) wherein R 1 and R 2 each independently represent a C1-20 alkyl, C5-12 cycloalkyl, phenyl, benzyl, C2-12 alkanoyl or benzoyl group; R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 and R 10 each independently represent hydrogen, C1-12 alkyl, a halogen atom, cyano, carboxyl, phenyl, C2-6 alkoxycarbonyl or benzoyl; wherein the C5-12 cycloalkyl group may have an oxygen atom in the ring and may be substituted with hydroxyl; a phenyl group for R 1 and R 2 may be optionally substituted with one or more groups and/or atoms selected from the group consisting of C1-6 alkyl, hydroxyl, halogen atoms, cyano, carboxyl, phenyl, C1-6 alkoxy, phenoxy and C2-6 alkoxycarbonyl; a benzyl group may be optionally substituted with one or more groups and/or atoms selected from the group consisting of C1-6 alkyl, hydroxyl, halogen atoms, cyano, carboxyl, phenyl, C1-6 alkoxy, phenoxy and C2-6 alkoxycarbonyl; and a benzoyl group may be optionally substituted with one or more groups and/or atoms selected from the group consisting of C1-6 alkyl, hydroxyl, halogen atoms, cyano, carboxyl, phenyl, C1-6 alkoxy, phenoxy and C2-6 alkoxycarbonyl, wherein the weight average molecular weight of the binder polymer is 5000-300,000, and wherein the content of the compound represented by the general formula (1) is 0.01-10 parts, by weight, with respect to 100 parts, by weight, as the total of the binder polymer and the photopolymerizing compound; (B) exposing a plurality of sections of the photosensitive layer to light having a peak in the wavelength range of 390 nm to 440 nm; (C) developing the exposed photosensitive layer to form a resist pattern; and (D) forming a conductor pattern on the board based on the resist pattern.