Compositions comprising kaolin having nanosize dimensions
View Patent ↗Disclosed herein is a kaolin composition having nanosize dimensions. At least about 75% of the kaolin particles by weight have an equivalent spherical diameter (esd) of less than about 0.25 μm. The kaolin can also have a particle size distribution wherein at least about 99% of the particles by weight have an esd of less than about 2 μm, and/or wherein at least about 98% of the particles by weight have an esd of less than about 1 μm, and/or wherein at least about 97% of the particles by weight have an esd of less than about 0.5 μm. The kaolin can have a mean diameter ranging from about 0.075 μm to about 0.2 μm, and a shape factor of about 30 or less.
1. A composition comprising kaolin having a particle size distribution wherein at least about 75% of the particles by weight have an esd of less than about 0.25 μm, and wherein the kaolin has a mean diameter ranging from about 0.1 μm to about 0.15 μm.
2. The composition according to claim 1 , wherein the kaolin has a GE brightness of at least about 80.
3. The composition according to claim 2 , wherein the kaolin has a GE brightness of at least about 85.
4. The composition according to claim 3 , wherein the kaolin has a GE brightness of at least about 90.
5. The composition according to claim 1 , wherein the kaolin has a shape factor of about 30 or less.
6. The composition according to claim 5 , wherein the kaolin has a shape factor ranging from about 15 to about 25.
7. The composition according to claim 1 , wherein at least about 99% of the particles by weight have an esd of less than about 2 μm.
8. The composition according to claim 1 , wherein at least about 98% of the particles by weight have an esd of less than about 1 μm.
9. The composition according to claim 1 , wherein at least about 97% of the particles by weight have an esd of less than about 0.5 μm.
10. The composition according to claim 1 , wherein at least about 80% of the particles by weight have an esd less than about 0.25 μm.
11. The composition according to claim 10 , wherein at least about 85% of the particles by weight have an esd less than about 0.25 μm.
12. A composition comprising kaolin having a particle size distribution wherein at least about 75% of the particles by weight have an esd of less than about 0.25 μm, and wherein at least about 50% of the particles by weight have an esd less than about 0.15 μm.
13. The composition according to claim 12 , wherein at least about 65% of the particles by weight have an esd less than about 0.15 μm.
14. A composition comprising kaolin having a particle size distribution wherein at least about 75% of the particles by weight have an esd of less than about 0.25 μm, and wherein at least about 40% of the particles by weight have an esd less than about 0.1 μm.
15. A composition comprising kaolin having a particle size distribution of:
at least about 99% of the particles by weight have an esd of less than about 2 μm;
at least about 98% of the particles by weight have an esd of less than about 1 μm;
at least about 97% of the particles by weight have an esd of less than about 0.5 μm; and
at least about 75% of the particles by weight have an esd of less than about 0.25 μm,
wherein at least about 50% of the particles by weight have an esd less than about 0.15 μm.