Polymerizable compound, polymer compound, composition using the same, image-forming method, and image-forming apparatus

A block polymer comprising a repetitive unit structure represented by the formula (2) or (3):

• formula (2):
• wherein X′ represents a polyalkenyl group;
• A represents a linear or branched alkylene group having a carbon atom number of 1 to 15 with or without substitution;
• m represents an integer from 0 to 30, wherein if m is a plural number, each A is the same or different from each other;
• B represents a single bond or an alkylene group with or without substitution;
• D represents an aromatic ring structure with or without substitution;
• n represents an integer from 0 to 10, wherein if n is a plural number, each D is the same or different from each other;
• and
• R represents a hydrogen atom, an alkyl group with or without substitution, or an aromatic ring structure with or without substitution;
• formula (3):
• wherein X′ represents a polyalkenyl group;
• A represents a linear or branched alkylene group having a carbon atom number of 1 to 15 with or without substitution;
• m represents an integer from 0 to 10, wherein if n is a plural number, each A is the same or different from each other;
• B represents a single bond or an alkylene group with or without substitution;
• D represents an aromatic ring structure with or without substitution;
• n represents an integer from 0 to 30, wherein if m is a plural number, each D is the same or different from each other;
• and
• M represents a monovalent or polyvalent metal cation.