| http://www.w3.org/ns/prov#value | - In a preferable embodiment of the present invention, the amphiphilic block copolymer is a block copolymer in which the polymerization degree ratio between the hydrophobic block segment, nonionic hydrophilic segment and ionic hydrophilic segment arranged in that order is such that the proportion of the polymerization degree of the nonionic hydrophilic segment is 8 or lower and that of the ionic hyd
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