METHOD OF FORMING A TRANSPARENT AND GAS-PERMEABILITY DECREASING COATING TO A PAPER OR BOARD WEB AND A COAT FORMULATION FOR THE METHOD

摘要

The present invention relates to method of forming a transparent and gas-permeability decreasing coating by virtue of applying acoating containing at least one polymer dispersion on a sheet of paper, boardor similar cellulosic fiber based web in at least one coatingstep. The method according to the invention is based on the use of a polymerdispersion containing extremely pure talc particles having adegree of purity of 90-100 % and a particle size of 90 % smaller than 40µm.