{HEAD ~ the acrylic polymer} is a copolymer of a monomer mixture comprising an alkyl acrylate having an alkyl group of 12 or more carbon atoms and a reactive acrylate having a functional group capable of reacting with an amino group, wherein {TAIL ~ the urethane group} is introduced by a reaction between the functional group capable of reacting with an amino group, an amino alcohol and a polyvalent isocyanate compound, and 
{ HEAD ~ the acrylic polymer } is a copolymer of a monomer mixture comprising an alkyl acrylate having an alkyl group of 12 or more carbon atoms and a reactive acrylate having a functional group capable of reacting with an amino group , wherein { TAIL ~ the urethane group } is introduced by a reaction between the functional group capable of reacting with an amino group , an amino alcohol and a polyvalent isocyanate compound , and
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