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

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. Impermeability to water vapour is achieved by the application medium being formed of a free-rosin dispersion which contains additives to improve the film-forming properties.