Process for reducing the water-vapour permeability of paper, paper board or the like, and paper with increased impermeability to water

摘要

Process for reducing the water-vapour permeability of paper, paper board or the like, in which the paper is coated with an application medium. A low water-vapour permeability is achieved by the application medium being formed of a free-rosin dispersion which contains additives to improve the film-forming properties.