Method of forming a transparent and gas-permeability decreasing coating to a paper or board web and a coat formulation for the method where surprising result lies in low demand for wetting agents when small and pure talc is used

摘要

A method of forming a transparent and gas-permeability decreasing coating by virtue of applying a coating containing at least one polymer dispersion on a sheet of cellulosic fiber based web in at least one coating step. The method according is based on the use of a polymer dispersion containing extremely pure talc particles having a degree of purity of 90-100 % and a particle size of 90 % smaller than 40 mu m.