Pigment formulations
Formulations of easily dispersible (ED) pigments comprising a combination of a carboxylic acid polymer and a non-ionic alkoxylated surfactant are disclosed. The combination is used in the formulation of a plurality of pigments. The formulations are suitable for mixing with a base medium at the point-of-sale (PoS) or by the end user.
1. A method of tinting a base medium to provide a medium of predetermined colour comprising the steps of adding a predetermined amount of a spray dried particulate formulation to a predetermined volume of the base medium and then mixing to provide the medium of predetermined colour where the formulation consists essentially of a plurality of pigments and 0.5 to 3.8% (w/w) hydroxylated amine, 1.4 to 11.3% (w/w) acrylic acid polymer and 4.5 to 37.7% (w/w) ethylene oxide-propylene oxide diblock copolymer.
2. The method of claim 1 where the formulation consists essentially of a plurality of pigments and 0.5 to 2.4% (w/w) hydroxylated amine, 2 to 7% (w/w) acrylic acid polymer and 7.5 to 19% (w/w) ethylene oxide-propylene oxide diblock copolymer.
3. The method of claim 2 where the formulation consists essentially of a plurality of pigments and 1% (w/w) hydroxylated amine, 3% (w/w) acrylic acid polymer and 10% (w/w) ethylene oxide-propylene oxide diblock copolymer.
4. The method of claim 3 where the hydroxylated amine is 2-amino-2-methyl-1-propanol.
5. The method of claim 4 where the base medium is a surface coating.
6. The method of claim 5 where the surface coating is paint.
7. The method of claim 6 where the base medium is acrylate paint.