Modified acrylic block copolymer and its preparation and uses

(Meth) having a polymer block having an acrylic acid ester units (a) (A), and (meth) 'polymer block having a (B acrylic acid ester unit (b)'), and (meth) acrylic acid ester units (a) are (meth) acrylic acid ester unit (b ') reacting the amine compound in the block copolymer is a unit of a different structure (C), (meth) acrylic acid ester unit (b') some or all, N- substituted (meth) acrylamide units (d) of, selected from the group consisting of (meth) acrylic acid units (c) and N- substituted bis ((meth) acrylic) amide units (e) the manufacturing method comprising converting at least one, obtain the modified acrylic block copolymer.