Photosensitive composition, partition walls and black matrix

A photosensitive composition, which comprises a polymer (A) having a side chain containing a group represented by the following formula (1) or a group represented by the following formula (2) and a side chain containing an ethylenic double bond in one molecule, a black colorant (B), a photopolymerization initiator (C) which is a compound represented by the following formula (3), and a photosensitive resin (D) containing an acidic group and an ethylenic double bond in one molecule, wherein the proportion of the black colorant (B) in the total solid content of the composition is from 15 to 60 mass %:

• —CFXRf formula (1)
• wherein X is a hydrogen atom, a fluorine atom or a trifluoromethyl group, and Rf is an alkyl group having at most 20 carbon atoms which may have an etheric oxygen atom, at least one of hydrogen atoms of which is substituted by a fluorine atom, or a fluorine atom;
• —(SiR1R2O)n—SiR1R2R3 formula (2)
• wherein each of R1 and R2 which are independent of each other, is a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group, R3 is a hydrogen atom or a C1-10 organic group, and n is an integer of from 1 to 200;
• wherein R1 is a hydrogen atom, a C1-12 alkyl group, a C3-8 cycloalkyl group, a C2-5 alkenyl group, a C6-20 phenyl group or a C6-20 phenoxy group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group;
• R2 is a hydrogen atom, a C1-20 alkyl group, a C3-8 cycloalkyl group, a C6-20 phenyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C2-20 alkanoyl group, a C7-20 benzoyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C2-12 alkoxycarbonyl group, or a C7-20 phenoxycarbonyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group;
• R3 is a C1-12 alkyl group;
• and
• each of R4, R5, R6 and R7 which are independent of one another, is a hydrogen atom, a C1-12 alkyl group, a C3-8 cycloalkyl group of which a hydrogen atom in the cyclohexane ring may be substituted by an alkyl group, a C6-20 phenyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C2-20 alkanoyl group, a C7-20 benzoyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C7-20 benzylcarbonyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C2-12 alkoxycarbonyl group, a C7-20 phenoxycarbonyl group of which a hydrogen atom in the benzene ring may be substituted by an alkyl group, a C1-20 amide group or a nitro group.