Patent ID: 8501392
Filing Date: 2013-08-06
Classification: G03F

Abstract:
1. A photosensitive element comprising a support, a photosensitive layer and a protective film laminated in that order, wherein the photosensitive layer is composed of a photosensitive resin composition containing a binder polymer, a photopolymerizing compound, a photopolymerization initiator, and in addition thereto at least one sensitizing agent selected from the group of compounds represented by the following general formulas (1) and (2), the photopolymerization initiator is 2,4,5-triarylimidazole dimer, the binder polymer contains styrene or a styrene derivative, the protective film is composed mainly of polypropylene, the protective film has a property of inhibiting permeation of oxygen into the photosensitive layer, and the photosensitive element has a property of forming a resist pattern by exposure to light with a peak in the wavelength range of 390 nm-440 nm; [In formula (1), each R independently represents a C4-12 alkyl group, and a, b and c each independently represent an integer of 0-2 selected so that the total of a, b and c is 1-6; In formula (2), R 1 and R 2 each independently represent a C1-20 alkyl, C5-12 cycloalkyl, phenyl, benzyl, C2-12 alkanoyl or benzoyl group, and 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. When the aforementioned C1-20 alkyl group is a C2-12 alkyl group, it may have an oxygen atom between the main chain carbon atoms, and may be substituted with hydroxyl. The C5-12 cycloalkyl group may have an oxygen atom in the ring and may be substituted with hydroxyl. The phenyl group in R 1 and R 2 may be 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 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. The benzoyl group in R 1 and R 2 may be 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].