Composites of inorganic microparticles having a phosphated surface and alkaline earth carbonate nanoparticles

A method for producing a composite, comprising the steps of:

• a) providing surface-phosphated inorganic pigment and/or filler microparticles having a spherical equivalent diameter of 0.3 μm to 100 μm as determined by the sedimentation method;
• b) providing a nano alkaline earth carbonate composition in which ≧90 of the particles, based on the number N of the particles, have a spherical equivalent diameter of less than 200 nm as determined by the sedimentation method;
• c) providing a binder in aqueous form, wherein the binder is a copolymer comprising one or more dicarboxylic acids;
• one or more diamines, triamines, dialkanolamines or trialkanolamines;
• and epichlorohydrin;
• and
• d) mixing the surface-phosphated pigment and/or filler microparticles, the nano alkaline earth carbonate composition, and the binder.