Talc particulate and uses thereof
There is disclosed a talc particulate having a d 50 of from about 0.5 to 5.0 μm and comprising less than about 500 ppm of particles having a particle size of equal to or greater than 45 μm and a shape factor equal to or greater than about 40. A process for making the talc particulate is also disclosed. The talc particulate may be used in polymer compositions as a filler from which polymer composites and articles may be formed.
1. A processed talc particulate having a d 50 of from about 0.5 to 5.0 μm, having a shape factor equal to or greater than about 40, having a d 95 from 7.0 to 12.0 μm, having a steepness equal to or greater than 30.0, and comprising less than about 500 ppm of particles having a particle size of equal to or greater than 45 μm.
2. The talc particulate according to claim 1 comprising less than about 250 ppm of particles having a particle size of equal to or greater than about 45 μm.
3. The talc particulate according to claim 1 having:
a lamellarity index of from about 2.8 to about 45.0, and
a shape factor equal to or greater than 70 and no greater than 150.
4. The talc particulate according to claim 3 having a specific surface area (BET) of from about 10 m 2 /g to about 20 m 2 /g.
5. The talc particulate according to claim 4 which is surface treated with a surface treatment agent.
6. The talc particulate according to claim 1 having a lamellarity index of from about 2.8 to about 45.0.
7. The talc particulate according to claim 1 having a shape factor equal to or greater than 70 and no greater than 150.