Talc particulate and uses thereof
AssigneeImerys Talc Europe
InventorsJean-Sebastien MAS, Jerome CREPIN-LEBLOND
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Abstract
There is disclosed a talc particulate having a d50 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.
Claims22
A processed talc particulate having a d50 of from about 0.5 to 5.0 μm, having a shape factor equal to or greater than about 40, and comprising less than about 500 ppm of particles having a particle size of equal to or greater than 45 μm.
A process for preparing a talc particulate having a d50 of from about 0.5 to 5.0 μm and a shape factor equal to or greater than 40, and comprising less than about 500 ppm of particles having a particle size of equal to or greater than 45 μm, said process comprising:
- (a) delaminating a liquid suspension of a talc particulate having an initial particle size with a d50 of greater than about 5.0 μm and a d95 of at least about 20.0 μm to obtain a talc particulate having a particle size less than the initial particle size;
- (b) treating the suspension to reduce or eliminate particles having a d95 of greater than about 15.0 μm;
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- (c) at least partially drying the suspension to obtain a talc particulate having a d50 of from about 0.5 to 5.0 μm and a shape factor equal to or greater than 40, and comprising less than about 500 ppm of particles having a particle size of equal to or greater than 45 μm.
Dependencies are inferred from the claim text.