Blended opacifier for coatings and polymeric matrices
View Patent ↗A composite comprising a silicate material, such as, a sodium aluminosilicate, and titanium dioxide disposed on the surface thereof is disclosed, together with formulations comprising the composite and methods for preparing the same.
1. A composite comprising a silicate material and a plurality of titanium dioxide particles disposed on the surface of the silicate material, wherein:
the silicate material has an average particle size of from about 2 micrometers to about 50 micrometers,
the weight percent ratio of the titanium dioxide particles to the silicate material is from about 3:1 to about 10:1, and
the titanium dioxide particles have an average particle size of about 0.15 micrometer to less than about 1 micrometer.
2. The composite of claim 1 , wherein the silicate material comprises an aluminosilicate.
3. The composite of claim 1 , wherein the silicate material comprises a sodium aluminosilicate.
4. The composite of claim 1 , wherein the titanium dioxide comprises a chloride-process rutile titanium dioxide.
5. A slurry comprising a liquid and the composite of claim 1 .
6. A paint or coating formulation comprising a liquid and the composite of claim 1 .
7. The paint or coating formulation of claim 6 , wherein all or substantially all titanium dioxide is present on the surface of the silicate material.
8. The paint or coating formulation of claim 6 , having at least one of improved opacity, improved contrast, and/or reduced water demand, as compared to conventionally prepared paint or coating formulations.
9. A method for preparing a composite, the method comprising contacting a silicate material and titanium dioxide particles, and then blending the silicate and titanium dioxide particles so as to form a composite, and wherein:
the silicate material has an average particle size of from about 2 micrometers to about 50 micrometers,
the weight percent ratio of the titanium dioxide particles to the silicate material is from about 3:1 to about 10:1, and
the titanium dioxide particles have an average particle size of about 0.15 micrometer to less than about 1 micrometer.
10. A composite comprising a silicate material and a plurality of titanium dioxide particles disposed on the surface of the silicate material, wherein:
the silicate material has an average particle size of from about 3 micrometers to about 40 micrometers,
the weight percent ratio of the titanium dioxide particles to the silicate material is from about 2:1 to about 10:1, and
the titanium dioxide particles have an average particle size of about 0.15 micrometer to less than about 1 micrometer.
11. The composite of claim 10 , wherein the silicate material comprises an aluminosilicate.
12. The composite of claim 10 , wherein the silicate material comprises a sodium aluminosilicate.
13. The composite of claim 10 , wherein the silicate material has an average particle size of from about 3 micrometers to about 12 micrometers.
14. A slurry comprising a liquid and the composite of claim 10 .
15. A paint or coating formulation comprising a liquid and the composite of claim 10 .
16. The paint or coating formulation of claim 15 , wherein all or substantially all titanium dioxide is present on the surface of the silicate material.
17. The paint or coating formulation of claim 15 , having at least one of improved opacity, improved contrast, and/or reduced water demand, as compared to conventionally prepared paint or coating formulations.