Composite of inorganic and/or organic microparticles and nano-dolomite particles

A composite comprising:

• (i) 20 to 80 wt. %, based on the total dry weight of the composite, of microparticles having a spherical equivalent diameter of 0.3 μm to 12 μm, wherein the microparticles are organic microparticles comprising polyethylene, polypropylene, polyethylene terephthalate, polystyrene or any mixture thereof, and wherein the microparticles have a spherical structure, a hollow spherical structure, or a hollow hemispherical structure;
• (ii) 80 to 20 wt. %, based on the total dry weight of the composite, of a dolomite nanoparticle composition at least partially coating the microparticles, wherein ≥90% of particles of the dolomite nanoparticle composition, based on the number N of particles, have a spherical equivalent diameter of 20 nm to 200 nm, wherein the dolomite nanoparticle composition is ground natural dolomite that is ground in the presence of one or more grinding aids and/or dispersants, and wherein the dolomite nanoparticle composition contains more than 90% dolomite and one or more grinding aids and/or dispersants;
• (iii) 0.3 to 3 wt. %, based on the total dry weight of the composite, of a binder that facilitates adhesion of the microparticles with the dolomite nanoparticle composition, wherein the binder is a copolymer comprising one or more dicarboxylic acids, and one or more diamines, triamines, dialkanolamines or trialkanolamines, and
• (iv) optionally one or more additional dispersants,
• wherein the sum of the weight amounts of the microparticles, the dolomite nanoparticle composition, the binder, and grinding aids and/or dispersants is 100% of the composite.