Patent ID: 6071475
Filing Date: 2000-06-06
Classification: D21H

Abstract:
A process for preserving a plurality of paper layers which are in contact with each other at least in partial regions without causing adhesion of the paper layers, comprising(a) impregnating the plurality of paper layers with a preservative fluid comprising polycondensates based on one or more hydrolytically polycondensable compounds of the elements M of the main groups III to V and the sub-groups II to IV of the Periodic Table, where in said polycondensates at least one organic group G which comprises at least two carbon atoms to each of which at least one atom selected from the group consisting of hydrogen and fluorine atoms is bonded and which organic group G has no polar substituents, is bonded, either directly via one of the carbon atoms or via a linking group A, to at least 0.1% of the central atoms M; and(b) drying and/or curing of the plurality of paper layers that have been impregnated with said preservative fluid.