Patents Assigned to Patria Papier & Zellstoff AG Frantschach
  • Method for reducing the water vapour permeability of paper
    Patent number: 5358790
    Abstract: The invention relates to a method of reducing the water vapor permeability of a sheet of paper, which comprises the step of coating the paper sheet with a film of 5-30 g/sq.m. of a coating medium consisting of a rosin sizing dispersion containing additives improving the film-forming properties of the coating medium, which additives include surfactants and waxes. It also deals with a paper so produced.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: October 25, 1994
    Assignee: Patria Papier & Zellstoff AG Frantschach
    Inventors: Walter Ruf, Josef Bachler