Polymer compound and block polymer compound

A polymer compound having a repeating unit structure represented by the following general formula (2):

• wherein A′ represents a polyalkenyl ether group which may be substituted;
• B represents a linear or branched alkylene group having 1 to 15 carbon atoms which may be substituted;
• m represents an integer from 0 to 30;
• when m is larger than 1, B may be different from each other;
• D represents a single bond or a linear or branched alkylene group having 1 to 10 carbon atoms which may be substituted;
• E represents any one of an aromatic ring which may be substituted, a condensed ring which may be substituted, and a structure formed by bonding through single bonds at most three aromatic rings which may be substituted;
• R1 represents —COOH, —COOR4, or —COO−M;
• R4 represents a linear or branched alkyl group having 1 to 5 carbon atoms which may be substituted or an aromatic ring which may be substituted;
• M represents a monovalent or polyvalent metal cation;
• n represents a positive number larger than 1;
• an R1 group in the formula is substituted into the aromatic ring of E;
• and a hydrogen atom in the aromatic ring, which is not substituted with R1, may be substituted,
• wherein the polymer compound comprises as a copolymer composition a repeating unit structure having a polycarboxylic acid represented by the general formula (2) on a side chain and a repeating unit structure having a monocarboxylic acid represented by the following general formula (9) on a side chain:
• wherein A′ represents a polyalkenyl ether group which may be substituted:
• B′ represents a linear or branched alkylene group having 1 to 15 carbon atoms which may be substituted;
• m represents an integer from 0 to 30;
• when m is larger than 1, B′ may be different from each other;
• D′ represents a single bond or a linear or branched alkylene group having 1 to 10 carbon atoms which may be substituted;
• E′ represents any one of an aromatic ring which may be substituted, a condensed ring which may be substituted, a structure formed by bonding through single bonds at most three aromatic rings which may be substituted, and a methylene group;
• R2 represents —COOH, —COOR3, or —COO−M;
• R3 represents a linear or branched alkyl group having 1 to 5 carbon atoms which may be substituted or an aromatic ring which may be substituted;
• M represents a monovalent or polyvalent metal cation;
• an R2 group in the formula is substituted for a hydrogen atom in the aromatic ring or the methylene group of E′;
• and a hydrogen atom in the aromatic ring or the methylene group, which is not substituted with R2, may be substituted.