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 {HEAD ~ the urethane group} is introduced by {TAIL ~ a reaction} between the functional group capable of reacting with an amino group, an amino alcohol and a polyvalent isocyanate compound, and the mass ratio within the acrylic polymer between the copolymer portion and the introduced urethane group portions is within a range from 60:40 to 99:1 
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 { HEAD ~ the urethane group } is introduced by { TAIL ~ a reaction } between the functional group capable of reacting with an amino group , an amino alcohol and a polyvalent isocyanate compound , and the mass ratio within the acrylic polymer between the copolymer portion and the introduced urethane group portions is within a range from 60:40 to 99:1
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