Composition for coating paper or cardboard pigmented, water-based, and method for improving the brightness in the blade coated paper or cardboard

摘要

Composition for coating paper or cardboard pigmented, water-based, and method for improving the brightness in the blade coated paper or cardboard.A composition for coating paper or cardboard pigmented and the basis of water containing, as a pigment, from 50% to 100% by weight, based on the weight of pigment, calcium carbonate and 1% to 25%.As dry weight based on the weight of pigment, an aqueous polymer dispersion including: (a) 95 to 25% by weight, based on the weight of the solids from the aqueous polymer dispersion.A first polymer emulsion having an average particle diameter of 150 to 3000 nm and (b) 5 to 75% by weight, based on the weight of the solids from the aqueous polymer dispersion.A second polymer emulsion having an average particle diameter of from 40 to 600 nanometers, where the ratio of the average particle diameter of the first polymer emulsion for the diameter of partu00edcThe middle of the second ula polymer emulsion is 1.2 to 60, where at least the particles of the first polymer emulsion, when dry, contain at least one pore.And where the first polymer emulsion is prepared in the presence of the second polymer emulsion or the second polymer emulsion is prepared in the presence of the first polymer emulsion is provided.As is a process for improving the brightness in the blade of paper or cardboard coated with the coating composition.