Improved low titanium dioxide coatings

Abstract

An aqueous coating composition having a PVC of from 78 to 85% comprising, based on the total volume solids of the dry coating unless otherwise stated, a) opacifying pigment particles comprising. i) from 3 to 10% titanium dioxide ii) from 0 to 20% of hollow polymeric particles. b) non-opacifying extender particles comprising. i) calcium magnesium carbonate and / or ii) calcium carbonate and / or iii) nepheline syenite and / or iv) kaolin wherein i)+ii)+iii)+iv) = 40 to 80% and iv) is 0 to 20% c) polymer binder particles of calculated Fox Tg of from 5 to 25°C having an acid value of from 15 to 65mg KOH / g of polymer and wherein the polymer particles are derived from acrylic monomers and optionally further comprising styrene and / or its derivatives d) dispersant having a weight average molecular weight of at least 3500 Daltons and selected on the basis that the dispersant demand of a mixture of th.e opacifying pigment particles, other than the hollow poly-_ meric particles, of a) and the extender particles of b) is greater than 0.35wt%, calculated on the weight of the titanium dioxide and extender particles e) fugitive coalescing solvent wherein the composition is free of non-fugitive coalescing solvent