The invention provides an aqueous dispersion which includes i) an aqueous dispersion
(I) resulting from dispersion of a block copolymer (I) composed of at least one
polymer block (A) containing olefin monomer units and at least one polymer block
(B) containing 2 to 100 mole percent of units derived from at least one vinyl monomer
having a carboxyl or carboxylic anhydride group and 98 to 0 (zero) mole percent
of units derived from another vinyl monomer or monomers copolymerizable with the
carboxyl group- or carboxylic anhydride group-containing vinyl monomer, in an aqueous
solution of not less than 0.05 equivalent, relative to the carboxyl or carboxylic
anhydride group, of a basic substance, and ii) a polyurethane (II), iii) vinyl
polymer (III) or iv) tackifier (IV) incorporated in the aqueous dispersion (I).
The aqueous dispersion of the invention has excellent adhesiveness to various substrates
and stability, and gives a coating layer having excellent weather resistance, water
resistance and resistance to solvent attack. The aqueous dispersion of the invention
is particularly useful as a coating composition and/or a primer.