Patent ID: 7838197

Claim:
A photosensitive composition, comprising: a carboxylic acid-containing resin; a photoinitiator in an amount of 0.01 to 30 parts by mass to 100 parts by mass of the carboxylic acid-containing resin; a pigment in an amount of 0.01 to 5 parts by mass to 100 parts by mass of the carboxylic acid-containing resin; and a sensitizer comprising at least one compound selected from the group consisting of thioxanthone compounds and dialkylamino group-containing coumarin compounds having a maximum absorption wavelength of 350 to 410 nm, wherein when exposed by one-shot exposure via a photomask to light from a UV lamp or in direct writing with light from a UV lamp or laser light, the photosensitive composition forms a patterned latent image which is developed with an alkaline aqueous solution, the photosensitive composition forms the patterned latent image in both the one-shot exposure and the direct writing, the photosensitive composition in a form of a dry coating before light exposure has a difference between maximum absorbance and minimum absorbance, in a wavelength range of 355 to 405 nm, which is within 0.3 per 25 μm film thickness of the dry coating, the photoinitiator comprises oxime ester photoinitiators, α-aminoacetophenone photoinitiators and acylphosphine oxide photoinitiators, the oxime ester photoinitiators have a group represented by a formula (I), the α-aminoacetophenone photoinitiators have a group represented by a formula (II), the acylphosphine oxide photoinitiators have a group represented by a formula (III), where R 1 represents a hydrogen atom; a phenyl group which may be substituted with one or more C1 to C6 alkyl groups, phenyl groups or halogen atoms; a C1 to C20 alkyl group which may be substituted with one or more hydroxyl groups and may have one or more oxygen atoms in an alkyl chain thereof; a C5 to C8 cycloalkyl group, a C2 to C20 alkanoyl group, or a benzoyl group which may be substituted with one or more C1 to C6 alkyl groups or phenyl groups, R 2 represents a phenyl group which may be substituted with one or more C1 to C6 alkyl groups, phenyl groups or halogen atoms; a C1 to C20 alkyl group which may be substituted with one or more hydroxyl groups and may have one or more oxygen atoms in an alkyl chain thereof; a C5 to C8 cycloalkyl group, a C2 to C20 alkanoyl group, or a benzoyl group which may be substituted with one or more C1 to C6 alkyl groups or phenyl groups; R 3 and R 4 independently represent a C1 to C12 alkyl group or an arylalkyl group, R 5 and R 6 independently represent a hydrogen atom, a C1 to C6 alkyl group or are bound to form a cyclic alkyl ether group; and R 7 and R 8 independently represent a C1 to C10 linear or branched alkyl group; a cyclohexyl group; a cyclopentyl group; an aryl group; or an aryl group substituted with one or more halogen atoms, alkyl groups or alkoxy groups, provided that either R 7 or R 8 may represent R—C(═O)— group wherein R represents a C1 to C20 hydrocarbon group.