A nitrogen-containing acrylic copolymer composition comprising:(i) a linear copolymer comprising about 2 to about 90% by weight of recurring units of Formula (A), ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a hydrogen atom, a C.sub.1-20 alkyl group, a C.sub.3-10 cycloalkyl group, a C.sub.3-8 alkenyl group, a C.sub.1-15 aminoalkyl group, a C.sub.6-20 aryl group or a C.sub.7-12 arylalkyl group,based on the total weight of the linear copolymer, about 10 to about 98% by weight of recurring units of formula (B), ##STR2## wherein R.sub.3 represents a hydrogen atom, a methyl group, a C.sub.1-6 alkoxy group, a halogen atom or a --CH.sub.2 COOR.sub.6 group wherein R.sub.6 represents a hydrogen atom, a C.sub.1-10 alkyl group or a C.sub.7-12 arylalkyl group,R.sub.4 represents a hydrogen atom, a C.sub.1-20 alkyl group, a C.sub.3-10 cycloalkyl group, a C.sub.3-10 halocycloalkyl group, a C.sub.6-20 aryl group, a C.sub.6-20 haloaryl group, a C.sub.7-12 arylalkyl group, a C.sub.1-12 haloalkyl group, a C.sub.1-12 hydroxyalkyl group, a C.sub.2-12 alkoxyalkyl group, a tetrahydrofurfuryl group, a glycidyl group, a --CH.sub.2 --CH.sub.2 --O--.sub.m R.sub.7, wherein R.sub.7 is a C.sub.1-8 alkyl group and m is an integer of 1 to 30, or a C.sub.3-20 dialkylaminoalkyl group, andR.sub.5 represents a hydrogen atom or a --COOR.sub.8 group wherein R.sub.8 is a hydrogen atom or a C.sub.1-20 alkyl group,based on the total weight of the linear copolymer and 0 to about 88% by weight of recurring units of at least one of Formulae (C.sup.1), (C.sup.2) and (C.sup.3), ##STR3## wherein V and W each independently is a hydrogen atom, a C.sub.1-8 alkyl group, a phenyl group or a halogen atom,based on the total weight of the linear copolymer,(ii) about 0.1 to about 10% by weight of an amine-modified epoxy compound where all or part of the epoxy group has been replaced by the unit of Formula (I), ##STR4## wherein R.sub.12 and R.sub.13 each independently is a hydrogen atom, a C.sub.1-20 alkyl group, a C.sub.3-10 cycloalkyl group, a C.sub.1-12 hydroxyalkyl group, a C.sub.1-15 aminoalkyl group, a H--NH--CH.sub.2 --CH.sub.2 --.sub.n wherein n is an integer of 1 to 8, a C.sub.6-15 aryl group or a C.sub.7-12 arylalkyl group,based on the weight of the linear copolymer and(iii) about 0.05 to about 12% by weight of a blocked polyisocyanate where all or part of the isocyanate groups has been replaced by an alcohol and/or an amine, based on the weight of the linear copolymer.