The present invention relates to a phosphorus acid functionalized opaque polymer, which is useful as an additive in pigmented coating formulations.
Opaque polymers are well known as additives in pigmented coating formulations such as paints and are used to improve hiding of coated substrates. Opaque polymers are used to reduce the load of the comparatively expensive TiO2 in formulations without sacrificing hiding, or to maintain the same levels of TiO2 to improve hiding. Opaque polymers can be prepared, for example, as described in U.S. Pat. No. 6,020,435.
It would be an advance in the field of pigmented coating compositions to discover an additive with improved hiding capability.