Patent ID: 7563853

Claim:
A polymer compound of a block polymer containing at least three block segments each having a repeating unit structure comprising a polyalkenyl ether structure, comprising a repeating unit structure represented by the following general formula (1) in at least one block segment of the block polymer and a repeating unit structure represented by the following general formula (2) in at least one other block segment: 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 of 1 to 30 and, in the case that m is two or more, the B groups may be the same or different from each other; R 1 , R 2 , and R 3 represent each a linear or branched alkyl group having 1 to 10 carbon atoms which may be substituted or an aromatic ring which may be substituted, at least one of R 1 , R 2 , and R 3 having a t-butyl group or a phenyl group; and R 1 , R 2 , and R 3 may be the same in structure or different in structure from each other; 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 of 1 to 30 and, in the case that m is two or more, the B′ groups may be the same or 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 of a single bond, an aromatic ring which may be substituted, a condensed ring which may be substituted, or a structure comprising up to three aromatic rings, which may be substituted, that are bonded via single bond(s); R 4 represents —COOH, —COOR 5 , or —COO − M; R 5 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 multivalent metal cation; and in the case that the aromatic ring of the above E is substituted at a hydrogen atom(s), the hydrogen atom(s) is substituted by halogen atom(s).