Aqueous polymer dispersion and coating composition

An aqueous dispersion comprising an emulsion polymer, wherein the emulsion polymer comprises, by weight based on the weight of the emulsion polymer,

• (i) from 24.5% to 35% of structural units of monomer (a) having a biobased carbon content of 92% or more and having the structure of formula (I):
• where R1 and R2 are each independently selected from an alkyl group having from 4 to 10 carbon atoms;
• (ii) from 0.1% to 10% of structural units of monomer (b) an ethylenically unsaturated carrying at least one functional group selected from carboxyl, carboxylic anhydride, sulfonic acid, sulphonate, hydroxyl, amide, or combinations thereof;
• salts thereof;
• or mixtures thereof;
• (iii) from 20% to 50% of structural units of monomer (c) ethyl (meth)acrylate that has a biobased carbon content of 30% to 60%;
• (iv) from 4% to 20% of structural units of monomer (d) an alkyl (meth)acrylate that has a linear alky group with 8 to 16 carbon atoms and that has a biobased carbon content of 60% or more;
• (v) from 1.5% to 7% of structural units of monomer (e) an acetoacetoxy or acetoacetamide functional monomer;
• (vi) from 5% to 25% structural units of monomer (f) a hard monomer;
• and
• (vii) from zero to 15% of structural units of monomer (g) an additional ethylenically unsaturated nonionic monomer;
• wherein the total concentration of structural units of monomers (c), (d), (e), and (f) is in a range of 51% to 74%;
• and
• wherein the emulsion polymer particles have a particle size of 60 nanometers to 300 nanometers.