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 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 mass ratio} within the acrylic polymer between the copolymer portion and the introduced urethane group portions is within {TAIL ~ a range} from 60:40 to 99:1 
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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 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 mass ratio } within the acrylic polymer between the copolymer portion and the introduced urethane group portions is within { TAIL ~ a range } from 60:40 to 99:1
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