Pigment composition and colored photosensitive composition

A copolymer of a polymerizable oligomer and one or more monomers wherein the polymerizable oligomer is selected from the group consisting of a poly(alkyl acrylate), a copolymer of an alkyl acrylate and a copolymerizable monomer, a poly(alkyl methacrylate), a copolymer of an alkyl methacrylate and a copolymerizable monomer, or polystyrene, any of which has a number average molecular weight of 1,000 to 10,000 and has an acryloyl or methacryloyl group in its terminal position;

• and
• at least one monomer is a compound of the following formula (1):
• 11
• in which R11 represents hydrogen atom or methyl group;
• R12 represents an alkylene group of 1 to 8 carbon atoms;
• X1 represents —N(R13)(R14) in which each of R13 and R14 independently is hydrogen atom, an alkyl group of 1 to 6 carbon atoms, or phenyl group, —R15—N(R16)(R17) in which R15 is an alkylene group of 1 to 6 carbon atoms and each of R16 and R17 independently is hydrogen atom, an alkyl group of 1 to 6 carbon atoms, or phenyl group, or a heterocyclic group selected from the group consisting of pyrrolidino, pyrrolidyl, pyridyl, piperidino or morpholino;
• and each of m and n independently is 0 or 1.