Patent ID: 8546481

Claim:
An aqueous dispersion containing a graft copolymer satisfying (a) to (e) shown below and water: (a) a graft rate is 1 to 150% by mass, (b) a weight average molecular weight measured by GPC is 500 to 400000, (c) a molecular weight distribution (Mw/Mn) is 1.5 to 4, (d) a main chain is a polymerization chain containing a monomer unit having a hydrophilic group and (e) a side chain is a homopolymerization chain of a single kind or a copolymerization chain of two or more kinds selected from α-olefins having 3 to 28 carbon atoms or a copolymerization chain comprising an α-olefin unit having 3 to 28 carbon atoms and an ethylene unit which accounts for 50% by mass or less, wherein a mesopentad ratio [mmmm] of the polymerization chain is 30 to 80 mole %.